// SPRINT4-001: Educational platform implementation
// PMAT Complexity: <10 per function
use crate::notebook::testing::types::Notebook;
use std::collections::HashMap;
#[derive(Debug, Clone)]
pub struct Assignment {
    pub id: String,
    pub title: String,
    pub description: String,
    pub notebook_template: Notebook,
    pub due_date: Option<chrono::DateTime<chrono::Utc>>,
    pub points: u32,
    pub rubric: Vec<RubricItem>,
    pub test_cases: Vec<TestCase>,
}
#[derive(Debug, Clone)]
pub struct RubricItem {
    pub id: String,
    pub description: String,
    pub points: u32,
    pub criteria: Vec<String>,
}
#[derive(Debug, Clone)]
pub struct TestCase {
    pub id: String,
    pub cell_id: String,
    pub input: String,
    pub expected_output: String,
    pub points: u32,
    pub hidden: bool,
}
#[derive(Debug, Clone)]
pub struct StudentSubmission {
    pub student_id: String,
    pub assignment_id: String,
    pub notebook: Notebook,
    pub submitted_at: chrono::DateTime<chrono::Utc>,
    pub grade: Option<Grade>,
}
#[derive(Debug, Clone)]
pub struct Grade {
    pub total_points: u32,
    pub max_points: u32,
    pub percentage: f64,
    pub feedback: Vec<Feedback>,
    pub rubric_scores: HashMap<String, u32>,
}
#[derive(Debug, Clone)]
pub struct Feedback {
    pub cell_id: String,
    pub message: String,
    pub severity: FeedbackSeverity,
}
#[derive(Debug, Clone)]
pub enum FeedbackSeverity {
    Success,
    Warning,
    Error,
    Info,
}

/// Educational platform for notebook-based learning
pub struct EducationalPlatform {
    assignments: Vec<Assignment>,
    submissions: std::collections::HashMap<String, Vec<StudentSubmission>>,
    peer_reviews: Vec<PeerReview>,
    analytics: LearningAnalytics,
}

impl Default for EducationalPlatform {
    fn default() -> Self {
        Self::new()
    }
}

impl EducationalPlatform {
/// # Examples
/// 
/// ```
/// use ruchy::notebook::testing::educational::EducationalPlatform;
/// 
/// let instance = EducationalPlatform::new();
/// // Verify behavior
/// ```
/// # Examples
/// 
/// ```
/// use ruchy::notebook::testing::educational::EducationalPlatform;
/// 
/// let instance = EducationalPlatform::new();
/// // Verify behavior
/// ```
pub fn new() -> Self {
        Self {
            assignments: Vec::new(),
            submissions: HashMap::new(),
            peer_reviews: Vec::new(),
            analytics: LearningAnalytics::new(),
        }
    }
    /// Create a new assignment
/// # Examples
/// 
/// ```
/// use ruchy::notebook::testing::educational::EducationalPlatform;
/// 
/// let mut instance = EducationalPlatform::new();
/// let result = instance.create_assignment();
/// // Verify behavior
/// ```
pub fn create_assignment(&mut self, assignment: Assignment) -> Result<(), String> {
        if self.assignments.iter().any(|a| a.id == assignment.id) {
            return Err("Assignment ID already exists".to_string());
        }
        self.assignments.push(assignment);
        Ok(())
    }
    /// Get all assignments
/// # Examples
/// 
/// ```ignore
/// use ruchy::notebook::testing::educational::get_assignments;
/// 
/// let result = get_assignments(());
/// assert_eq!(result, Ok(()));
/// ```
pub fn get_assignments(&self) -> &[Assignment] {
        &self.assignments
    }
    /// Submit an assignment
/// # Examples
/// 
/// ```ignore
/// use ruchy::notebook::testing::educational::submit_assignment;
/// 
/// let result = submit_assignment("example");
/// assert_eq!(result, Ok(()));
/// ```
pub fn submit_assignment(&mut self, student_id: &str, mut submission: StudentSubmission) -> Result<(), String> {
        // Validate assignment exists
        if !self.assignments.iter().any(|a| a.id == submission.assignment_id) {
            return Err("Assignment not found".to_string());
        }
        // Auto-grade if test cases exist
        if let Some(assignment) = self.assignments.iter().find(|a| a.id == submission.assignment_id) {
            if !assignment.test_cases.is_empty() {
                submission.grade = Some(self.auto_grade(&submission));
            }
        }
        // Track submission
        self.submissions
            .entry(student_id.to_string())
            .or_default()
            .push(submission);
        // Track analytics
        self.analytics.track_event(LearningEvent {
            student_id: student_id.to_string(),
            event_type: EventType::AssignmentSubmit,
            cell_id: String::new(),
            timestamp: chrono::Utc::now(),
            success: true,
            duration_ms: 0,
        });
        Ok(())
    }
    /// Auto-grade a submission
/// # Examples
/// 
/// ```
/// use ruchy::notebook::testing::educational::EducationalPlatform;
/// 
/// let mut instance = EducationalPlatform::new();
/// let result = instance.auto_grade();
/// // Verify behavior
/// ```
pub fn auto_grade(&self, submission: &StudentSubmission) -> Grade {
        let assignment = self.assignments.iter()
            .find(|a| a.id == submission.assignment_id)
            .unwrap();
        let mut total_points = 0;
        let mut feedback = Vec::new();
        // Run test cases
        for test_case in &assignment.test_cases {
            if let Some(cell) = submission.notebook.cells.iter().find(|c| c.id == test_case.cell_id) {
                // Simplified test execution
                if cell.source.contains(&test_case.expected_output) {
                    total_points += test_case.points;
                    feedback.push(Feedback {
                        cell_id: test_case.cell_id.clone(),
                        message: format!("Test {} passed", test_case.id),
                        severity: FeedbackSeverity::Success,
                    });
                } else {
                    feedback.push(Feedback {
                        cell_id: test_case.cell_id.clone(),
                        message: format!("Test {} failed", test_case.id),
                        severity: FeedbackSeverity::Error,
                    });
                }
            }
        }
        Grade {
            total_points,
            max_points: assignment.points,
            percentage: (f64::from(total_points) / f64::from(assignment.points)) * 100.0,
            feedback,
            rubric_scores: HashMap::new(),
        }
    }
    /// Submit a peer review
/// # Examples
/// 
/// ```ignore
/// use ruchy::notebook::testing::educational::submit_peer_review;
/// 
/// let result = submit_peer_review(());
/// assert_eq!(result, Ok(()));
/// ```
pub fn submit_peer_review(&mut self, review: PeerReview) -> Result<(), String> {
        self.peer_reviews.push(review);
        Ok(())
    }
    /// Get analytics for the platform
/// # Examples
/// 
/// ```ignore
/// use ruchy::notebook::testing::educational::get_analytics;
/// 
/// let result = get_analytics(());
/// assert_eq!(result, Ok(()));
/// ```
pub fn get_analytics(&self) -> &LearningAnalytics {
        &self.analytics
    }
}
/// Learning analytics system
#[derive(Debug, Clone)]
pub struct LearningAnalytics {
    events: Vec<LearningEvent>,
}
#[derive(Debug, Clone)]
pub struct LearningEvent {
    pub student_id: String,
    pub event_type: EventType,
    pub cell_id: String,
    pub timestamp: chrono::DateTime<chrono::Utc>,
    pub success: bool,
    pub duration_ms: u64,
}
#[derive(Debug, Clone)]
pub enum EventType {
    CellExecution,
    TestRun,
    AssignmentSubmit,
    AssignmentComplete,
    TutorialStep,
    HintRequested,
}
#[derive(Debug, Clone)]
pub struct StudentMetrics {
    pub total_executions: usize,
    pub success_rate: f64,
    pub avg_execution_time_ms: u64,
    pub assignments_completed: usize,
}
#[derive(Debug, Clone)]
pub struct ClassMetrics {
    pub total_students: usize,
    pub completion_rate: f64,
    pub avg_score: f64,
}
impl Default for LearningAnalytics {
    fn default() -> Self {
        Self::new()
    }
}

impl LearningAnalytics {
    pub fn new() -> Self {
        Self { events: Vec::new() }
    }
    /// Track a learning event
/// # Examples
/// 
/// ```ignore
/// use ruchy::notebook::testing::educational::track_event;
/// 
/// let result = track_event(());
/// assert_eq!(result, Ok(()));
/// ```
pub fn track_event(&mut self, event: LearningEvent) {
        self.events.push(event);
    }
    /// Get metrics for a specific student
/// # Examples
/// 
/// ```ignore
/// use ruchy::notebook::testing::educational::get_student_metrics;
/// 
/// let result = get_student_metrics("example");
/// assert_eq!(result, Ok(()));
/// ```
pub fn get_student_metrics(&self, student_id: &str) -> StudentMetrics {
        let student_events: Vec<_> = self.events.iter()
            .filter(|e| e.student_id == student_id)
            .collect();
        let total = student_events.len();
        let successful = student_events.iter().filter(|e| e.success).count();
        let completions = student_events.iter()
            .filter(|e| matches!(e.event_type, EventType::AssignmentComplete))
            .count();
        let avg_time = if total > 0 {
            let total_time: u64 = student_events.iter().map(|e| e.duration_ms).sum();
            total_time / total as u64
        } else {
            0
        };
        StudentMetrics {
            total_executions: total,
            success_rate: if total > 0 { successful as f64 / total as f64 } else { 0.0 },
            avg_execution_time_ms: avg_time,
            assignments_completed: completions,
        }
    }
    /// Get metrics for the entire class
/// # Examples
/// 
/// ```ignore
/// use ruchy::notebook::testing::educational::get_class_metrics;
/// 
/// let result = get_class_metrics(());
/// assert_eq!(result, Ok(()));
/// ```
pub fn get_class_metrics(&self) -> ClassMetrics {
        let unique_students: std::collections::HashSet<_> = 
            self.events.iter().map(|e| &e.student_id).collect();
        let completions = self.events.iter()
            .filter(|e| matches!(e.event_type, EventType::AssignmentComplete))
            .count();
        ClassMetrics {
            total_students: unique_students.len(),
            completion_rate: if unique_students.is_empty() {
                0.0
            } else {
                completions as f64 / unique_students.len() as f64
            },
            avg_score: 0.0, // Would calculate from grades
        }
    }
}
/// Peer review system
#[derive(Debug, Clone)]
pub struct PeerReview {
    pub id: String,
    pub assignment_id: String,
    pub reviewer_id: String,
    pub reviewee_id: String,
    pub feedback: Vec<ReviewComment>,
    pub rating: u8,
}
#[derive(Debug, Clone)]
pub struct ReviewComment {
    pub cell_id: String,
    pub line_number: Option<usize>,
    pub comment: String,
    pub category: CommentCategory,
}
#[derive(Debug, Clone)]
pub enum CommentCategory {
    Style,
    Correctness,
    Efficiency,
    Positive,
    Suggestion,
}
impl Default for Assignment {
    fn default() -> Self {
        Self {
            id: String::new(),
            title: String::new(),
            description: String::new(),
            notebook_template: Notebook {
                cells: vec![],
                metadata: None,
            },
            due_date: None,
            points: 100,
            rubric: vec![],
            test_cases: vec![],
        }
    }
}
