//! Comprehensive Learning Center for Special Functions
//!
//! This is the master hub for all educational content in scirs2-special.
//! It provides structured learning paths, progress tracking, and connects
//! all the interactive tutorials and examples into a cohesive educational experience.
//!
//! Features:
//! - Guided learning paths from beginner to expert
//! - Progress tracking and personalized recommendations
//! - Integration with all existing educational examples
//! - Adaptive difficulty based on user performance
//! - Comprehensive assessment and certification
//! - Cross-references with mathematical foundations
//! - Real-world application connections
//! - Research-level advanced topics
//!
//! Learning Tracks Available:
//! 1. **Mathematical Foundations Track** - Pure mathematics focus
//! 2. **Physics Applications Track** - Physics and engineering applications  
//! 3. **Computational Methods Track** - Numerical analysis and algorithms
//! 4. **Research Applications Track** - Advanced topics and current research
//! 5. **Software Development Track** - Implementation and optimization
//!
//! Run with: cargo run --example comprehensive_learningcenter

use scirs2_core::random::{Rng, RngExt};
use serde::{Deserialize, Serialize};
use std::collections::{HashMap, HashSet};
use std::io::{self, Write};
use std::time::{Duration, SystemTime};

#[derive(Debug, Clone, Serialize, Deserialize)]
struct LearningCenter {
    learning_tracks: Vec<LearningTrack>,
    user_profiles: HashMap<String, UserProfile>,
    current_user: Option<String>,
    resource_catalog: ResourceCatalog,
    assessment_engine: AssessmentEngine,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct LearningTrack {
    id: String,
    title: String,
    description: String,
    difficulty_level: DifficultyLevel,
    estimated_hours: f64,
    prerequisites: Vec<String>,
    learning_modules: Vec<LearningModule>,
    capstone_projects: Vec<CapstoneProject>,
    certification_criteria: CertificationCriteria,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct LearningModule {
    id: String,
    title: String,
    description: String,
    learning_objectives: Vec<String>,
    content_type: ContentType,
    estimated_duration: Duration,
    resources: Vec<String>, // References to examples, docs, etc.
    assessments: Vec<Assessment>,
    practical_exercises: Vec<Exercise>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
enum ContentType {
    Tutorial,      // Interactive step-by-step learning
    Demonstration, // Showcase of capabilities
    Workshop,      // Hands-on coding session
    Theory,        // Mathematical foundations
    Application,   // Real-world use cases
    Research,      // Cutting-edge topics
}

#[derive(Debug, Clone, Serialize, Deserialize)]
enum DifficultyLevel {
    Beginner,     // High school mathematics
    Intermediate, // Undergraduate level
    Advanced,     // Graduate level
    Expert,       // Research level
    CuttingEdge,  // Current research frontiers
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct UserProfile {
    username: String,
    skill_level: DifficultyLevel,
    completed_modules: HashSet<String>,
    current_track: Option<String>,
    learning_progress: HashMap<String, ModuleProgress>,
    assessment_scores: HashMap<String, f64>,
    time_spent: HashMap<String, Duration>,
    achievements: Vec<Achievement>,
    personal_notes: Vec<String>,
    last_active: SystemTime,
    preferred_learning_style: LearningStyle,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct ModuleProgress {
    status: ProgressStatus,
    completion_percentage: f64,
    time_spent: Duration,
    last_accessed: SystemTime,
    best_score: Option<f64>,
    attempts: u32,
    notes: Vec<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
enum ProgressStatus {
    NotStarted,
    InProgress,
    Completed,
    Mastered,
    ReviewNeeded,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
enum LearningStyle {
    Visual,      // Prefer diagrams and visualizations
    Analytical,  // Prefer mathematical rigor
    Practical,   // Prefer hands-on examples
    Theoretical, // Prefer deep mathematical foundations
    Applied,     // Prefer real-world applications
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct Achievement {
    id: String,
    title: String,
    description: String,
    icon: String,
    earned_date: SystemTime,
    category: AchievementCategory,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
enum AchievementCategory {
    Completion,    // Finished modules/tracks
    Excellence,    // High assessment scores
    Dedication,    // Time spent learning
    Innovation,    // Creative solutions
    Collaboration, // Helping others
    Research,      // Advanced contributions
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct ResourceCatalog {
    examples: HashMap<String, ExampleResource>,
    documentation: HashMap<String, DocumentationResource>,
    external_links: HashMap<String, ExternalResource>,
    research_papers: HashMap<String, ResearchPaper>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct ExampleResource {
    file_path: String,
    title: String,
    description: String,
    topics_covered: Vec<String>,
    difficulty: DifficultyLevel,
    estimated_runtime: Duration,
    prerequisites: Vec<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct DocumentationResource {
    file_path: String,
    title: String,
    section: String,
    topics: Vec<String>,
    depth_level: DocDepth,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
enum DocDepth {
    Overview,
    Detailed,
    Comprehensive,
    Reference,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct ExternalResource {
    url: String,
    title: String,
    description: String,
    resource_type: ExternalType,
    reliability_score: f64,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
enum ExternalType {
    VideoTutorial,
    OnlineCourse,
    ResearchPaper,
    Blog,
    Documentation,
    Software,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct ResearchPaper {
    title: String,
    authors: Vec<String>,
    journal: String,
    year: u32,
    doi: Option<String>,
    topics: Vec<String>,
    relevance_score: f64,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct AssessmentEngine {
    question_bank: HashMap<String, Question>,
    adaptive_parameters: AdaptiveParameters,
    scoring_rubrics: HashMap<String, ScoringRubric>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct Question {
    id: String,
    content: String,
    question_type: QuestionType,
    difficulty: f64,
    topics: Vec<String>,
    correct_answer: String,
    explanation: String,
    hints: Vec<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
enum QuestionType {
    MultipleChoice,
    NumericalAnswer,
    CodeCompletion,
    ProofSteps,
    Conceptual,
    Application,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct AdaptiveParameters {
    difficulty_adjustment_rate: f64,
    mastery_threshold: f64,
    review_trigger_threshold: f64,
    advancement_criteria: f64,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct Assessment {
    id: String,
    title: String,
    questions: Vec<String>,
    time_limit: Option<Duration>,
    passing_score: f64,
    adaptive: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct Exercise {
    id: String,
    title: String,
    description: String,
    starter_code: Option<String>,
    solution_template: Option<String>,
    validation_criteria: Vec<String>,
    difficulty: f64,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct CapstoneProject {
    id: String,
    title: String,
    description: String,
    objectives: Vec<String>,
    deliverables: Vec<String>,
    evaluation_criteria: Vec<String>,
    estimated_hours: f64,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct CertificationCriteria {
    min_modules_completed: usize,
    min_average_score: f64,
    required_capstone_projects: usize,
    time_requirements: Option<Duration>,
    peer_review_required: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct ScoringRubric {
    criteria: Vec<RubricCriterion>,
    weight_distribution: HashMap<String, f64>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct RubricCriterion {
    name: String,
    description: String,
    levels: Vec<PerformanceLevel>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct PerformanceLevel {
    level: String,
    description: String,
    points: f64,
}

impl LearningCenter {
    fn new() -> Self {
        let mut center = LearningCenter {
            learning_tracks: Vec::new(),
            user_profiles: HashMap::new(),
            current_user: None,
            resource_catalog: ResourceCatalog::new(),
            assessment_engine: AssessmentEngine::new(),
        };

        center.initialize_tracks();
        center.populate_resource_catalog();
        center
    }

    fn initialize_tracks(&mut self) {
        self.learning_tracks = vec![
            self.create_mathematical_foundations_track(),
            self.create_physics_applications_track(),
            self.create_computational_methods_track(),
            self.create_research_applications_track(),
            self.create_software_development_track(),
        ];
    }

    fn create_mathematical_foundations_track(&self) -> LearningTrack {
        LearningTrack {
            id: "mathematical_foundations".to_string(),
            title: "Mathematical Foundations of Special Functions".to_string(),
            description: "Deep dive into the mathematical theory underlying special functions, with rigorous proofs and theoretical development.".to_string(),
            difficulty_level: DifficultyLevel::Intermediate,
            estimated_hours: 40.0,
            prerequisites: vec!["calculus".to_string(), "complex_analysis".to_string()],
            learning_modules: vec![
                LearningModule {
                    id: "gamma_theory".to_string(),
                    title: "Gamma and Beta Functions Theory".to_string(),
                    description: "Comprehensive treatment of gamma function properties, proofs, and applications.".to_string(),
                    learning_objectives: vec![
                        "Understand integral definition and convergence".to_string(),
                        "Master recurrence relations and functional equations".to_string(),
                        "Apply Stirling's approximation and asymptotic analysis".to_string(),
                        "Connect to Beta function and special values".to_string(),
                    ],
                    content_type: ContentType::Theory,
                    estimated_duration: Duration::from_secs(3600 * 6), // 6 hours
                    resources: vec![
                        "mathematical_derivation_studio".to_string(),
                        "MATHEMATICAL_FOUNDATIONS.md#gamma".to_string(),
                        "gamma_functions".to_string(),
                    ],
                    assessments: vec![
                        Assessment {
                            id: "gamma_theory_quiz".to_string(),
                            title: "Gamma Function Theory Assessment".to_string(),
                            questions: vec!["gamma_integral".to_string(), "gamma_recurrence".to_string()],
                            time_limit: Some(Duration::from_secs(1800)),
                            passing_score: 0.8,
                            adaptive: true,
                        }
                    ],
                    practical_exercises: vec![
                        Exercise {
                            id: "gamma_implementation".to_string(),
                            title: "Implement Gamma Function from Scratch".to_string(),
                            description: "Code a numerical implementation of the gamma function using series and asymptotic methods.".to_string(),
                            starter_code: Some("fn gamma(x: f64) -> f64 { todo!() }".to_string()),
                            solution_template: None,
                            validation_criteria: vec!["accuracy_test".to_string(), "performance_test".to_string()],
                            difficulty: 0.7,
                        }
                    ],
                },
                LearningModule {
                    id: "bessel_theory".to_string(),
                    title: "Bessel Functions and Differential Equations".to_string(),
                    description: "Systematic development of Bessel functions from differential equations to applications.".to_string(),
                    learning_objectives: vec![
                        "Solve Bessel's differential equation".to_string(),
                        "Understand generating functions and series representations".to_string(),
                        "Master orthogonality relations and zeros".to_string(),
                        "Apply asymptotic approximations".to_string(),
                    ],
                    content_type: ContentType::Theory,
                    estimated_duration: Duration::from_secs(3600 * 8), // 8 hours
                    resources: vec![
                        "bessel_visualization".to_string(),
                        "MATHEMATICAL_FOUNDATIONS.md#bessel".to_string(),
                        "complex_bessel_demo".to_string(),
                    ],
                    assessments: vec![],
                    practical_exercises: vec![],
                },
                // Additional modules would be defined here...
            ],
            capstone_projects: vec![
                CapstoneProject {
                    id: "special_functions_library".to_string(),
                    title: "Design Your Own Special Functions Library".to_string(),
                    description: "Create a mini-library implementing 5 special function families with full documentation and tests.".to_string(),
                    objectives: vec![
                        "Implement numerical algorithms".to_string(),
                        "Write comprehensive documentation".to_string(),
                        "Create educational examples".to_string(),
                        "Benchmark against reference implementations".to_string(),
                    ],
                    deliverables: vec![
                        "Working Rust crate".to_string(),
                        "Mathematical documentation".to_string(),
                        "Performance analysis".to_string(),
                        "Educational examples".to_string(),
                    ],
                    evaluation_criteria: vec![
                        "Correctness of implementations".to_string(),
                        "Quality of documentation".to_string(),
                        "Performance optimization".to_string(),
                        "Educational value".to_string(),
                    ],
                    estimated_hours: 25.0,
                }
            ],
            certification_criteria: CertificationCriteria {
                min_modules_completed: 6,
                min_average_score: 0.85,
                required_capstone_projects: 1,
                time_requirements: Some(Duration::from_secs(3600 * 40)),
                peer_review_required: true,
            },
        }
    }

    fn create_physics_applications_track(&self) -> LearningTrack {
        LearningTrack {
            id: "physics_applications".to_string(),
            title: "Physics and Engineering Applications".to_string(),
            description: "Explore how special functions arise naturally in physics, engineering, and applied sciences.".to_string(),
            difficulty_level: DifficultyLevel::Intermediate,
            estimated_hours: 35.0,
            prerequisites: vec!["physics_background".to_string(), "differential_equations".to_string()],
            learning_modules: vec![
                LearningModule {
                    id: "quantum_mechanics".to_string(),
                    title: "Quantum Mechanics and Special Functions".to_string(),
                    description: "Discover how special functions emerge in quantum mechanical systems.".to_string(),
                    learning_objectives: vec![
                        "Solve Schrödinger equation for various potentials".to_string(),
                        "Understand wave functions and orthogonality".to_string(),
                        "Apply quantum mechanics to physical systems".to_string(),
                        "Connect mathematics to physical observables".to_string(),
                    ],
                    content_type: ContentType::Application,
                    estimated_duration: Duration::from_secs(3600 * 8),
                    resources: vec![
                        "physics_applications_interactive_lab".to_string(),
                        "quantum_harmonic_oscillator".to_string(),
                        "quantum_tunneling".to_string(),
                    ],
                    assessments: vec![],
                    practical_exercises: vec![],
                },
                // Additional physics modules...
            ],
            capstone_projects: vec![
                CapstoneProject {
                    id: "physics_simulation_suite".to_string(),
                    title: "Build a Physics Simulation Suite".to_string(),
                    description: "Create interactive simulations demonstrating special functions in various physics contexts.".to_string(),
                    objectives: vec![
                        "Implement multiple physics simulations".to_string(),
                        "Create interactive visualizations".to_string(),
                        "Validate against analytical solutions".to_string(),
                        "Design educational interfaces".to_string(),
                    ],
                    deliverables: vec![
                        "Simulation software".to_string(),
                        "Physics validation report".to_string(),
                        "User interface design".to_string(),
                        "Educational documentation".to_string(),
                    ],
                    evaluation_criteria: vec![
                        "Physics accuracy".to_string(),
                        "User experience".to_string(),
                        "Educational effectiveness".to_string(),
                        "Technical implementation".to_string(),
                    ],
                    estimated_hours: 30.0,
                }
            ],
            certification_criteria: CertificationCriteria {
                min_modules_completed: 5,
                min_average_score: 0.80,
                required_capstone_projects: 1,
                time_requirements: Some(Duration::from_secs(3600 * 35)),
                peer_review_required: false,
            },
        }
    }

    fn create_computational_methods_track(&self) -> LearningTrack {
        LearningTrack {
            id: "computational_methods".to_string(),
            title: "Computational Methods and Numerical Analysis".to_string(),
            description: "Master the numerical computation of special functions with focus on accuracy, efficiency, and implementation.".to_string(),
            difficulty_level: DifficultyLevel::Advanced,
            estimated_hours: 45.0,
            prerequisites: vec!["numerical_analysis".to_string(), "programming".to_string()],
            learning_modules: vec![
                LearningModule {
                    id: "series_methods".to_string(),
                    title: "Series Expansions and Convergence".to_string(),
                    description: "Learn to implement and optimize series-based computations of special functions.".to_string(),
                    learning_objectives: vec![
                        "Understand convergence criteria and acceleration".to_string(),
                        "Implement adaptive termination strategies".to_string(),
                        "Optimize for different parameter ranges".to_string(),
                        "Handle numerical precision issues".to_string(),
                    ],
                    content_type: ContentType::Workshop,
                    estimated_duration: Duration::from_secs(3600 * 6),
                    resources: vec![
                        "arbitrary_precision_demo".to_string(),
                        "simd_performance_demo".to_string(),
                        "stability_analysis_demo".to_string(),
                    ],
                    assessments: vec![],
                    practical_exercises: vec![],
                },
                // Additional computational modules...
            ],
            capstone_projects: vec![],
            certification_criteria: CertificationCriteria {
                min_modules_completed: 7,
                min_average_score: 0.85,
                required_capstone_projects: 1,
                time_requirements: Some(Duration::from_secs(3600 * 45)),
                peer_review_required: true,
            },
        }
    }

    fn create_research_applications_track(&self) -> LearningTrack {
        LearningTrack {
            id: "research_applications".to_string(),
            title: "Research Applications and Advanced Topics".to_string(),
            description: "Explore cutting-edge applications and current research in special functions.".to_string(),
            difficulty_level: DifficultyLevel::Expert,
            estimated_hours: 60.0,
            prerequisites: vec!["graduate_mathematics".to_string(), "research_experience".to_string()],
            learning_modules: vec![
                LearningModule {
                    id: "fractional_calculus".to_string(),
                    title: "Fractional Calculus and Wright Functions".to_string(),
                    description: "Advanced topics in fractional derivatives and their special function solutions.".to_string(),
                    learning_objectives: vec![
                        "Understand fractional differential equations".to_string(),
                        "Master Wright function properties".to_string(),
                        "Apply to anomalous diffusion problems".to_string(),
                        "Connect to current research frontiers".to_string(),
                    ],
                    content_type: ContentType::Research,
                    estimated_duration: Duration::from_secs(3600 * 10),
                    resources: vec![
                        "wright_bessel_tutorial".to_string(),
                        "wright_omega_standalone".to_string(),
                        "enhanced_derivation_studio".to_string(),
                    ],
                    assessments: vec![],
                    practical_exercises: vec![],
                },
                // Additional research modules...
            ],
            capstone_projects: vec![
                CapstoneProject {
                    id: "research_contribution".to_string(),
                    title: "Original Research Contribution".to_string(),
                    description: "Conduct original research in special functions theory or applications.".to_string(),
                    objectives: vec![
                        "Identify novel research question".to_string(),
                        "Develop mathematical theory or algorithms".to_string(),
                        "Validate through computation or proof".to_string(),
                        "Present findings professionally".to_string(),
                    ],
                    deliverables: vec![
                        "Research paper draft".to_string(),
                        "Computational implementations".to_string(),
                        "Presentation materials".to_string(),
                        "Peer review participation".to_string(),
                    ],
                    evaluation_criteria: vec![
                        "Novelty and significance".to_string(),
                        "Mathematical rigor".to_string(),
                        "Computational validation".to_string(),
                        "Presentation quality".to_string(),
                    ],
                    estimated_hours: 50.0,
                }
            ],
            certification_criteria: CertificationCriteria {
                min_modules_completed: 8,
                min_average_score: 0.90,
                required_capstone_projects: 1,
                time_requirements: Some(Duration::from_secs(3600 * 60)),
                peer_review_required: true,
            },
        }
    }

    fn create_software_development_track(&self) -> LearningTrack {
        LearningTrack {
            id: "software_development".to_string(),
            title: "Software Development and Optimization".to_string(),
            description:
                "Learn to develop, optimize, and maintain high-quality special functions software."
                    .to_string(),
            difficulty_level: DifficultyLevel::Advanced,
            estimated_hours: 50.0,
            prerequisites: vec![
                "rust_programming".to_string(),
                "software_engineering".to_string(),
            ],
            learning_modules: vec![
                LearningModule {
                    id: "performance_optimization".to_string(),
                    title: "Performance Optimization and SIMD".to_string(),
                    description:
                        "Master advanced optimization techniques for special functions computation."
                            .to_string(),
                    learning_objectives: vec![
                        "Understand SIMD programming patterns".to_string(),
                        "Implement vectorized algorithms".to_string(),
                        "Profile and benchmark effectively".to_string(),
                        "Optimize for different architectures".to_string(),
                    ],
                    content_type: ContentType::Workshop,
                    estimated_duration: Duration::from_secs(3600 * 8),
                    resources: vec![
                        "gpu_and_memory_efficient".to_string(),
                        "performance_monitor".to_string(),
                        "simd_performance_demo".to_string(),
                    ],
                    assessments: vec![],
                    practical_exercises: vec![],
                },
                // Additional software development modules...
            ],
            capstone_projects: vec![],
            certification_criteria: CertificationCriteria {
                min_modules_completed: 6,
                min_average_score: 0.85,
                required_capstone_projects: 1,
                time_requirements: Some(Duration::from_secs(3600 * 50)),
                peer_review_required: true,
            },
        }
    }

    fn populate_resource_catalog(&mut self) {
        // Initialize with comprehensive resource mappings
        self.resource_catalog.examples.insert(
            "physics_applications_interactive_lab".to_string(),
            ExampleResource {
                file_path: "examples/physics_applications_interactive_lab.rs".to_string(),
                title: "Physics Applications Interactive Laboratory".to_string(),
                description: "Comprehensive physics simulations using special functions"
                    .to_string(),
                topics_covered: vec![
                    "Quantum mechanics".to_string(),
                    "Wave propagation".to_string(),
                    "Heat diffusion".to_string(),
                    "Statistical mechanics".to_string(),
                ],
                difficulty: DifficultyLevel::Intermediate,
                estimated_runtime: Duration::from_secs(1800),
                prerequisites: vec!["basic_physics".to_string()],
            },
        );

        self.resource_catalog.examples.insert(
            "mathematical_derivation_studio".to_string(),
            ExampleResource {
                file_path: "examples/mathematical_derivation_studio.rs".to_string(),
                title: "Mathematical Derivation Studio".to_string(),
                description: "Interactive mathematical derivations with step-by-step guidance"
                    .to_string(),
                topics_covered: vec![
                    "Gamma function proofs".to_string(),
                    "Bessel function theory".to_string(),
                    "Asymptotic analysis".to_string(),
                ],
                difficulty: DifficultyLevel::Advanced,
                estimated_runtime: Duration::from_secs(2400),
                prerequisites: vec!["complex_analysis".to_string()],
            },
        );

        self.resource_catalog.documentation.insert(
            "mathematical_foundations".to_string(),
            DocumentationResource {
                file_path: "MATHEMATICAL_FOUNDATIONS.md".to_string(),
                title: "Mathematical Foundations of Special Functions".to_string(),
                section: "Complete reference".to_string(),
                topics: vec![
                    "Gamma functions".to_string(),
                    "Bessel functions".to_string(),
                    "Error functions".to_string(),
                    "Orthogonal polynomials".to_string(),
                ],
                depth_level: DocDepth::Comprehensive,
            },
        );

        // Add external resources
        self.resource_catalog.external_links.insert(
            "dlmf_handbook".to_string(),
            ExternalResource {
                url: "https://dlmf.nist.gov/".to_string(),
                title: "NIST Digital Library of Mathematical Functions".to_string(),
                description: "Authoritative reference for special functions".to_string(),
                resource_type: ExternalType::Documentation,
                reliability_score: 1.0,
            },
        );

        self.resource_catalog.external_links.insert(
            "scipy_special".to_string(),
            ExternalResource {
                url: "https://docs.scipy.org/doc/scipy/reference/special.html".to_string(),
                title: "SciPy Special Functions Documentation".to_string(),
                description: "Python reference implementation documentation".to_string(),
                resource_type: ExternalType::Documentation,
                reliability_score: 0.95,
            },
        );
    }
}

impl ResourceCatalog {
    fn new() -> Self {
        ResourceCatalog {
            examples: HashMap::new(),
            documentation: HashMap::new(),
            external_links: HashMap::new(),
            research_papers: HashMap::new(),
        }
    }
}

impl AssessmentEngine {
    fn new() -> Self {
        AssessmentEngine {
            question_bank: HashMap::new(),
            adaptive_parameters: AdaptiveParameters {
                difficulty_adjustment_rate: 0.1,
                mastery_threshold: 0.85,
                review_trigger_threshold: 0.70,
                advancement_criteria: 0.80,
            },
            scoring_rubrics: HashMap::new(),
        }
    }
}

#[allow(dead_code)]
fn main() -> Result<(), Box<dyn std::error::Error>> {
    println!("🎓 Comprehensive Learning Center for Special Functions");
    println!("=====================================================");
    println!("Welcome to your personalized learning journey!\n");

    let mut _learningcenter = LearningCenter::new();

    // User authentication/creation
    let username = get_user_input("Enter your username (or 'new' for new user): ")?;

    if username == "new" {
        create_new_user(&mut _learningcenter)?;
    } else {
        load_or_create_user(&mut _learningcenter, username)?;
    }

    // Main learning loop
    loop {
        display_dashboard(&_learningcenter)?;

        let choice = get_user_input(
            "\nEnter your choice (track #, 'progress', 'resources', 'help', or 'quit'): ",
        )?;

        match choice.to_lowercase().as_str() {
            "quit" | "q" => {
                save_user_progress(&_learningcenter)?;
                println!("🎓 Thank you for learning with us! Progress saved.");
                break;
            }
            "progress" | "p" => display_detailed_progress(&_learningcenter)?,
            "resources" | "r" => explore_resources(&_learningcenter)?,
            "help" | "h" => display_help()?,
            _ => {
                if let Ok(track_num) = choice.parse::<usize>() {
                    if track_num > 0 && track_num <= _learningcenter.learning_tracks.len() {
                        enter_learning_track(&mut _learningcenter, track_num - 1)?;
                    } else {
                        println!("❌ Invalid track number. Please try again.");
                    }
                } else {
                    println!("❌ Unknown command. Type 'help' for available options.");
                }
            }
        }
    }

    Ok(())
}

#[allow(dead_code)]
fn create_new_user(_learningcenter: &mut LearningCenter) -> Result<(), Box<dyn std::error::Error>> {
    println!("\n🆕 Creating new user profile...");

    let username = get_user_input("Choose a username: ")?;

    println!("\n📊 Please assess your current level:");
    println!("1. Beginner - High school mathematics");
    println!("2. Intermediate - Undergraduate level");
    println!("3. Advanced - Graduate level");
    println!("4. Expert - Research level");

    let level_choice = get_user_input("Enter your level (1-4): ")?;
    let skill_level = match level_choice.as_str() {
        "1" => DifficultyLevel::Beginner,
        "2" => DifficultyLevel::Intermediate,
        "3" => DifficultyLevel::Advanced,
        "4" => DifficultyLevel::Expert,
        _ => DifficultyLevel::Intermediate,
    };

    println!("\n🎯 What's your preferred learning style?");
    println!("1. Visual - Diagrams and visualizations");
    println!("2. Analytical - Mathematical rigor");
    println!("3. Practical - Hands-on examples");
    println!("4. Theoretical - Deep foundations");
    println!("5. Applied - Real-world applications");

    let style_choice = get_user_input("Enter your preference (1-5): ")?;
    let learning_style = match style_choice.as_str() {
        "1" => LearningStyle::Visual,
        "2" => LearningStyle::Analytical,
        "3" => LearningStyle::Practical,
        "4" => LearningStyle::Theoretical,
        "5" => LearningStyle::Applied,
        _ => LearningStyle::Practical,
    };

    let profile = UserProfile {
        username: username.clone(),
        skill_level,
        completed_modules: HashSet::new(),
        current_track: None,
        learning_progress: HashMap::new(),
        assessment_scores: HashMap::new(),
        time_spent: HashMap::new(),
        achievements: Vec::new(),
        personal_notes: Vec::new(),
        last_active: SystemTime::now(),
        preferred_learning_style: learning_style,
    };

    _learningcenter
        .user_profiles
        .insert(username.clone(), profile);
    _learningcenter.current_user = Some(username.clone());

    println!("✅ Profile created successfully for {}!", username);

    // Recommend initial track
    recommend_starting_track(_learningcenter)?;

    Ok(())
}

#[allow(dead_code)]
fn load_or_create_user(
    _learningcenter: &mut LearningCenter,
    username: String,
) -> Result<(), Box<dyn std::error::Error>> {
    // In a real implementation, this would load from persistent storage
    if !_learningcenter.user_profiles.contains_key(&username) {
        println!(
            "👤 User not found. Creating new profile for {}...",
            username
        );
        _learningcenter.current_user = Some(username.clone());
        create_new_user(_learningcenter)?;
    } else {
        _learningcenter.current_user = Some(username.clone());
        println!("👋 Welcome back, {}!", username);

        // Update last active time
        if let Some(profile) = _learningcenter.user_profiles.get_mut(&username) {
            profile.last_active = SystemTime::now();
        }
    }
    Ok(())
}

#[allow(dead_code)]
fn recommend_starting_track(
    _learningcenter: &LearningCenter,
) -> Result<(), Box<dyn std::error::Error>> {
    if let Some(username) = &_learningcenter.current_user {
        if let Some(profile) = _learningcenter.user_profiles.get(username) {
            println!("\n🎯 Based on your profile, we recommend starting with:");

            match (&profile.skill_level, &profile.preferred_learning_style) {
                (DifficultyLevel::Beginner, _) => {
                    println!("   📚 Mathematical Foundations Track - Start with the basics");
                }
                (DifficultyLevel::Intermediate, LearningStyle::Applied) => {
                    println!("   🧪 Physics Applications Track - See theory in action");
                }
                (DifficultyLevel::Intermediate, LearningStyle::Practical) => {
                    println!("   💻 Software Development Track - Learn by coding");
                }
                (DifficultyLevel::Advanced, _) => {
                    println!("   🔬 Computational Methods Track - Advanced numerical techniques");
                }
                (DifficultyLevel::Expert, _) => {
                    println!("   🚀 Research Applications Track - Cutting-edge topics");
                }
                _ => {
                    println!("   📚 Mathematical Foundations Track - Solid theoretical foundation");
                }
            }

            println!("\n💡 You can explore any track at any time. Start where you feel most comfortable!");
        }
    }
    Ok(())
}

#[allow(dead_code)]
fn display_dashboard(_learningcenter: &LearningCenter) -> Result<(), Box<dyn std::error::Error>> {
    println!("\n{}", "=".repeat(60));
    println!("🎓 LEARNING DASHBOARD");
    println!("{}", "=".repeat(60));

    if let Some(username) = &_learningcenter.current_user {
        if let Some(profile) = _learningcenter.user_profiles.get(username) {
            println!(
                "👤 User: {} | Level: {:?} | Style: {:?}",
                username, profile.skill_level, profile.preferred_learning_style
            );

            let completed = profile.completed_modules.len();
            let total_modules: usize = _learningcenter
                .learning_tracks
                .iter()
                .map(|track| track.learning_modules.len())
                .sum();

            println!(
                "📈 Progress: {}/{} modules completed ({:.1}%)",
                completed,
                total_modules,
                (completed as f64 / total_modules as f64) * 100.0
            );

            if !profile.achievements.is_empty() {
                println!(
                    "🏆 Recent achievements: {}",
                    profile
                        .achievements
                        .iter()
                        .take(3)
                        .map(|a| &a.title)
                        .cloned()
                        .collect::<Vec<_>>()
                        .join(", ")
                );
            }
        }
    }

    println!("\n📚 Available Learning Tracks:");
    for (i, track) in _learningcenter.learning_tracks.iter().enumerate() {
        let progress = calculate_track_progress(_learningcenter, &track.id);
        println!(
            "{}. {} ({:.0}% complete)",
            i + 1,
            track.title,
            progress * 100.0
        );
        println!(
            "   {} | {:?} | {:.0} hours",
            track.description, track.difficulty_level, track.estimated_hours
        );

        if let Some(username) = &_learningcenter.current_user {
            if let Some(profile) = _learningcenter.user_profiles.get(username) {
                if profile.current_track.as_ref() == Some(&track.id) {
                    println!("   📍 CURRENTLY ACTIVE");
                }
            }
        }
        println!();
    }

    Ok(())
}

#[allow(dead_code)]
fn calculate_track_progress(learning_center: &LearningCenter, trackid: &str) -> f64 {
    if let Some(username) = &learning_center.current_user {
        if let Some(profile) = learning_center.user_profiles.get(username) {
            if let Some(track) = learning_center
                .learning_tracks
                .iter()
                .find(|t| t.id == trackid)
            {
                let completed_modules = track
                    .learning_modules
                    .iter()
                    .filter(|module| profile.completed_modules.contains(&module.id))
                    .count();
                return completed_modules as f64 / track.learning_modules.len() as f64;
            }
        }
    }
    0.0
}

#[allow(dead_code)]
fn display_detailed_progress(
    _learningcenter: &LearningCenter,
) -> Result<(), Box<dyn std::error::Error>> {
    println!("\n📊 DETAILED PROGRESS REPORT");
    println!("{}", "=".repeat(40));

    if let Some(username) = &_learningcenter.current_user {
        if let Some(profile) = _learningcenter.user_profiles.get(username) {
            for track in &_learningcenter.learning_tracks {
                let progress = calculate_track_progress(_learningcenter, &track.id);
                println!("\n🎯 {}: {:.1}%", track.title, progress * 100.0);

                for module in &track.learning_modules {
                    let status = if profile.completed_modules.contains(&module.id) {
                        "✅ Completed"
                    } else if profile.learning_progress.contains_key(&module.id) {
                        "🔄 In Progress"
                    } else {
                        "⏳ Not Started"
                    };

                    println!("  {} {}", status, module.title);

                    if let Some(module_progress) = profile.learning_progress.get(&module.id) {
                        println!(
                            "     Progress: {:.0}% | Time: {:.1}h | Attempts: {}",
                            module_progress.completion_percentage * 100.0,
                            module_progress.time_spent.as_secs() as f64 / 3600.0,
                            module_progress.attempts
                        );
                    }
                }
            }

            // Display achievements
            if !profile.achievements.is_empty() {
                println!("\n🏆 ACHIEVEMENTS:");
                for achievement in &profile.achievements {
                    println!(
                        "  {} {} - {}",
                        achievement.icon, achievement.title, achievement.description
                    );
                }
            }
        }
    }

    println!("\nPress Enter to continue...");
    let _ = io::stdin().read_line(&mut String::new());
    Ok(())
}

#[allow(dead_code)]
fn explore_resources(_learningcenter: &LearningCenter) -> Result<(), Box<dyn std::error::Error>> {
    println!("\n📚 RESOURCE CATALOG");
    println!("{}", "=".repeat(30));

    println!("\n🖥️  Interactive Examples:");
    for resource in _learningcenter.resource_catalog.examples.values() {
        println!("  • {} - {}", resource.title, resource.description);
        println!(
            "    Topics: {} | Runtime: {:.0}min",
            resource.topics_covered.join(", "),
            resource.estimated_runtime.as_secs() as f64 / 60.0
        );
    }

    println!("\n📖 Documentation:");
    for doc in _learningcenter.resource_catalog.documentation.values() {
        println!("  • {} ({})", doc.title, doc.section);
        println!(
            "    Topics: {} | Depth: {:?}",
            doc.topics.join(", "),
            doc.depth_level
        );
    }

    println!("\n🌐 External Resources:");
    for ext in _learningcenter.resource_catalog.external_links.values() {
        println!("  • {} - {}", ext.title, ext.description);
        println!(
            "    URL: {} | Reliability: {:.0}%",
            ext.url,
            ext.reliability_score * 100.0
        );
    }

    let choice = get_user_input("\nEnter resource ID to launch, or press Enter to return: ")?;
    if !choice.is_empty() {
        launch_resource(_learningcenter, &choice)?;
    }

    Ok(())
}

#[allow(dead_code)]
fn launch_resource(
    _learningcenter: &LearningCenter,
    resource_id: &str,
) -> Result<(), Box<dyn std::error::Error>> {
    if let Some(example) = _learningcenter.resource_catalog.examples.get(resource_id) {
        println!("🚀 Launching example: {}", example.title);
        println!("📁 File: {}", example.file_path);
        println!(
            "💡 To run: cargo run --example {}",
            example
                .file_path
                .strip_prefix("examples/")
                .unwrap_or(&example.file_path)
                .strip_suffix(".rs")
                .unwrap_or(&example.file_path)
        );
    } else if let Some(doc) = _learningcenter
        .resource_catalog
        .documentation
        .get(resource_id)
    {
        println!("📖 Opening documentation: {}", doc.title);
        println!("📁 File: {}", doc.file_path);
    } else if let Some(ext) = _learningcenter
        .resource_catalog
        .external_links
        .get(resource_id)
    {
        println!("🌐 External resource: {}", ext.title);
        println!("🔗 URL: {}", ext.url);
        println!("💡 Please open this URL in your browser");
    } else {
        println!("❌ Resource not found: {}", resource_id);
    }

    println!("\nPress Enter to continue...");
    let _ = io::stdin().read_line(&mut String::new());
    Ok(())
}

#[allow(dead_code)]
fn enter_learning_track(
    _learningcenter: &mut LearningCenter,
    track_index: usize,
) -> Result<(), Box<dyn std::error::Error>> {
    let track = &_learningcenter.learning_tracks[track_index].clone();

    println!("\n🎯 Entering Learning Track: {}", track.title);
    println!("{}", "=".repeat(track.title.len() + 25));
    println!("{}", track.description);
    println!(
        "\n📊 Difficulty: {:?} | Estimated Time: {:.0} hours",
        track.difficulty_level, track.estimated_hours
    );

    if !track.prerequisites.is_empty() {
        println!("📋 Prerequisites: {}", track.prerequisites.join(", "));
    }

    // Update current track
    if let Some(username) = &_learningcenter.current_user {
        if let Some(profile) = _learningcenter.user_profiles.get_mut(username) {
            profile.current_track = Some(track.id.clone());
        }
    }

    loop {
        println!("\n📚 Learning Modules:");
        for (i, module) in track.learning_modules.iter().enumerate() {
            let status = get_module_status(_learningcenter, &module.id);
            println!("{}. {} {}", i + 1, status, module.title);
            println!(
                "   {} | Type: {:?} | Duration: {:.1}h",
                module.description,
                module.content_type,
                module.estimated_duration.as_secs() as f64 / 3600.0
            );
        }

        if !track.capstone_projects.is_empty() {
            println!("\n🎓 Capstone Projects:");
            for (i, project) in track.capstone_projects.iter().enumerate() {
                println!(
                    "{}. {} ({:.0} hours)",
                    i + 1,
                    project.title,
                    project.estimated_hours
                );
                println!("   {}", project.description);
            }
        }

        let choice =
            get_user_input("\nEnter module # to start, 'cert' for certification, or 'back': ")?;

        match choice.to_lowercase().as_str() {
            "back" | "b" => break,
            "cert" | "certification" => {
                check_certification_eligibility(_learningcenter, track)?;
            }
            _ => {
                if let Ok(module_num) = choice.parse::<usize>() {
                    if module_num > 0 && module_num <= track.learning_modules.len() {
                        start_learning_module(
                            _learningcenter,
                            &track.learning_modules[module_num - 1],
                        )?;
                    } else {
                        println!("❌ Invalid module number.");
                    }
                } else {
                    println!("❌ Unknown command.");
                }
            }
        }
    }

    Ok(())
}

#[allow(dead_code)]
fn get_module_status(_learningcenter: &LearningCenter, moduleid: &str) -> &'static str {
    if let Some(username) = &_learningcenter.current_user {
        if let Some(profile) = _learningcenter.user_profiles.get(username) {
            if profile.completed_modules.contains(moduleid) {
                return "✅";
            } else if profile.learning_progress.contains_key(moduleid) {
                return "🔄";
            }
        }
    }
    "⏳"
}

#[allow(dead_code)]
fn start_learning_module(
    _learningcenter: &mut LearningCenter,
    module: &LearningModule,
) -> Result<(), Box<dyn std::error::Error>> {
    println!("\n📖 Starting Module: {}", module.title);
    println!("{}", "=".repeat(module.title.len() + 18));
    println!("{}", module.description);

    println!("\n🎯 Learning Objectives:");
    for objective in &module.learning_objectives {
        println!("  • {}", objective);
    }

    println!("\n📚 Available Resources:");
    for resource in &module.resources {
        println!("  • {}", resource);
    }

    // Initialize or update progress
    if let Some(username) = &_learningcenter.current_user {
        if let Some(profile) = _learningcenter.user_profiles.get_mut(username) {
            profile
                .learning_progress
                .entry(module.id.clone())
                .or_insert_with(|| ModuleProgress {
                    status: ProgressStatus::InProgress,
                    completion_percentage: 0.0,
                    time_spent: Duration::new(0, 0),
                    last_accessed: SystemTime::now(),
                    best_score: None,
                    attempts: 0,
                    notes: Vec::new(),
                });
        }
    }

    let choice =
        get_user_input("\nPress Enter to continue with this module, or 'back' to return: ")?;
    if choice.to_lowercase() != "back" {
        simulate_module_completion(_learningcenter, module)?;
    }

    Ok(())
}

#[allow(dead_code)]
fn simulate_module_completion(
    _learningcenter: &mut LearningCenter,
    module: &LearningModule,
) -> Result<(), Box<dyn std::error::Error>> {
    println!("\n🔄 Working through module content...");
    println!("   (In a full implementation, this would be interactive content)");

    // Simulate some learning time
    std::thread::sleep(Duration::from_secs(2));

    println!("✅ Module content completed!");

    if !module.assessments.is_empty() {
        println!("\n📝 Assessment available. Would you like to take it? (y/n)");
        let choice = get_user_input("Choice: ")?;
        if choice.to_lowercase() == "y" || choice.to_lowercase() == "yes" {
            let score = simulate_assessment(&module.assessments[0])?;

            // Update progress
            let username = _learningcenter.current_user.clone();
            if let Some(ref username) = username {
                if let Some(profile) = _learningcenter.user_profiles.get_mut(username) {
                    if let Some(progress) = profile.learning_progress.get_mut(&module.id) {
                        progress.completion_percentage = 1.0;
                        progress.best_score = Some(score);
                        progress.attempts += 1;
                        progress.status = if score >= 0.8 {
                            ProgressStatus::Completed
                        } else {
                            ProgressStatus::ReviewNeeded
                        };
                    }

                    if score >= 0.8 {
                        profile.completed_modules.insert(module.id.clone());
                        println!("🎉 Module completed successfully!");
                    } else {
                        println!("📚 Consider reviewing the material before moving on.");
                    }
                }

                // Check for achievements after the mutable borrow is dropped
                if score >= 0.8 {
                    check_for_achievements(_learningcenter, username)?;
                }
            }
        }
    } else {
        // Mark as completed without assessment
        if let Some(username) = &_learningcenter.current_user {
            if let Some(profile) = _learningcenter.user_profiles.get_mut(username) {
                profile.completed_modules.insert(module.id.clone());
                if let Some(progress) = profile.learning_progress.get_mut(&module.id) {
                    progress.completion_percentage = 1.0;
                    progress.status = ProgressStatus::Completed;
                }
                println!("✅ Module marked as completed!");
            }
        }
    }

    Ok(())
}

#[allow(dead_code)]
fn simulate_assessment(assessment: &Assessment) -> Result<f64, Box<dyn std::error::Error>> {
    println!("\n📝 Assessment: {}", assessment.title);
    println!(
        "Questions: {} | Passing Score: {:.0}%",
        assessment.questions.len(),
        assessment.passing_score * 100.0
    );

    if let Some(time_limit) = assessment.time_limit {
        println!(
            "⏰ Time Limit: {:.0} minutes",
            time_limit.as_secs() as f64 / 60.0
        );
    }

    println!("\n🎯 (Simulated _assessment - randomly generated score)");
    std::thread::sleep(Duration::from_secs(1));

    // Simulate a score (in real implementation, this would be actual assessment)
    let score = 0.7 + (0.3 * scirs2_core::random::random::<f64>()); // Random score between 70-100%

    println!("📊 Your score: {:.1}%", score * 100.0);

    if score >= assessment.passing_score {
        println!("🎉 Passed!");
    } else {
        println!(
            "📚 Needs improvement. Passing score is {:.0}%",
            assessment.passing_score * 100.0
        );
    }

    Ok(score)
}

#[allow(dead_code)]
fn check_for_achievements(
    _learningcenter: &mut LearningCenter,
    username: &str,
) -> Result<(), Box<dyn std::error::Error>> {
    if let Some(profile) = _learningcenter.user_profiles.get_mut(username) {
        let completed_count = profile.completed_modules.len();

        // Check for completion milestones
        let milestone_achievements = [
            (
                1,
                "first_module",
                "🌟 First Steps",
                "Completed your first module",
            ),
            (
                5,
                "five_modules",
                "📚 Getting Started",
                "Completed 5 modules",
            ),
            (
                10,
                "ten_modules",
                "🎯 Dedicated Learner",
                "Completed 10 modules",
            ),
            (
                20,
                "twenty_modules",
                "🧠 Knowledge Seeker",
                "Completed 20 modules",
            ),
        ];

        for (threshold, id, title, description) in milestone_achievements {
            if completed_count >= threshold && !profile.achievements.iter().any(|a| a.id == id) {
                let achievement = Achievement {
                    id: id.to_string(),
                    title: title.to_string(),
                    description: description.to_string(),
                    icon: "🏆".to_string(),
                    earned_date: SystemTime::now(),
                    category: AchievementCategory::Completion,
                };

                profile.achievements.push(achievement);
                println!("🏆 NEW ACHIEVEMENT UNLOCKED: {} - {}", title, description);
            }
        }
    }
    Ok(())
}

#[allow(dead_code)]
fn check_certification_eligibility(
    _learningcenter: &LearningCenter,
    track: &LearningTrack,
) -> Result<(), Box<dyn std::error::Error>> {
    println!("\n🎓 CERTIFICATION STATUS: {}", track.title);
    println!("{}", "=".repeat(track.title.len() + 22));

    if let Some(username) = &_learningcenter.current_user {
        if let Some(profile) = _learningcenter.user_profiles.get(username) {
            let completed_modules = track
                .learning_modules
                .iter()
                .filter(|module| profile.completed_modules.contains(&module.id))
                .count();

            let avg_score = if profile.assessment_scores.is_empty() {
                0.0
            } else {
                profile.assessment_scores.values().sum::<f64>()
                    / profile.assessment_scores.len() as f64
            };

            println!("📊 Completion Status:");
            println!(
                "  Modules: {}/{} ({:.0}%)",
                completed_modules,
                track.certification_criteria.min_modules_completed,
                (completed_modules as f64
                    / track.certification_criteria.min_modules_completed as f64)
                    * 100.0
            );

            println!(
                "  Average Score: {:.1}% (Required: {:.0}%)",
                avg_score * 100.0,
                track.certification_criteria.min_average_score * 100.0
            );

            println!(
                "  Capstone Projects: 0/{}",
                track.certification_criteria.required_capstone_projects
            );

            let eligible = completed_modules >= track.certification_criteria.min_modules_completed
                && avg_score >= track.certification_criteria.min_average_score;

            if eligible {
                println!("\n✅ You are eligible for certification!");
                println!("📝 Complete the required capstone projects to earn your certificate.");
            } else {
                println!("\n⏳ Continue learning to become eligible for certification.");

                if completed_modules < track.certification_criteria.min_modules_completed {
                    println!(
                        "  Need to complete {} more modules",
                        track.certification_criteria.min_modules_completed - completed_modules
                    );
                }

                if avg_score < track.certification_criteria.min_average_score {
                    println!(
                        "  Need to improve average score by {:.1} percentage points",
                        (track.certification_criteria.min_average_score - avg_score) * 100.0
                    );
                }
            }
        }
    }

    println!("\nPress Enter to continue...");
    let _ = io::stdin().read_line(&mut String::new());
    Ok(())
}

#[allow(dead_code)]
fn display_help() -> Result<(), Box<dyn std::error::Error>> {
    println!("\n❓ HELP & GUIDANCE");
    println!("{}", "=".repeat(20));

    println!("\n🎓 Learning Center Commands:");
    println!("  1-5          - Enter a learning track");
    println!("  progress     - View detailed progress report");
    println!("  resources    - Explore available resources");
    println!("  help         - Show this help message");
    println!("  quit         - Exit and save progress");

    println!("\n📚 Learning Tracks Overview:");
    println!("  1. Mathematical Foundations  - Pure mathematics and theory");
    println!("  2. Physics Applications      - Real-world physics problems");
    println!("  3. Computational Methods     - Numerical analysis and algorithms");
    println!("  4. Research Applications     - Advanced and cutting-edge topics");
    println!("  5. Software Development      - Implementation and optimization");

    println!("\n💡 Learning Tips:");
    println!("  • Start with your recommended track based on your profile");
    println!("  • Complete modules in order for best learning progression");
    println!("  • Use the interactive examples to reinforce concepts");
    println!("  • Review mathematical foundations document for detailed proofs");
    println!("  • Take assessments to check your understanding");
    println!("  • Work on capstone projects for practical experience");

    println!("\n🏆 Achievements & Certification:");
    println!("  • Earn achievements by completing modules and scoring well");
    println!("  • Track certifications require completing minimum modules");
    println!("  • Capstone projects demonstrate practical application");
    println!("  • Peer review may be required for advanced certifications");

    println!("\nPress Enter to continue...");
    let _ = io::stdin().read_line(&mut String::new());
    Ok(())
}

#[allow(dead_code)]
fn save_user_progress(_learningcenter: &LearningCenter) -> Result<(), Box<dyn std::error::Error>> {
    // In a real implementation, this would save to persistent storage
    println!("💾 Saving progress...");
    std::thread::sleep(Duration::from_millis(500));
    println!("✅ Progress saved successfully!");
    Ok(())
}

#[allow(dead_code)]
fn get_user_input(prompt: &str) -> io::Result<String> {
    print!("{}", prompt);
    io::stdout().flush()?;
    let mut input = String::new();
    io::stdin().read_line(&mut input)?;
    Ok(input.trim().to_string())
}
