//! Complexity calculation algorithms and metrics.
//!
//! This module provides various complexity metrics for analyzing code quality,
//! including cyclomatic complexity, cognitive complexity, and entropy-based measures.
//! Calculations are implemented as pure functions for testability.
//!
//! # Complexity Types
//!
//! - **Cyclomatic**: Measures independent paths through code
//! - **Cognitive**: Measures mental effort required to understand code
//! - **Entropy**: Measures information density and unpredictability
//! - **Weighted**: Combines metrics with configurable weights
//!
//! # Architecture
//!
//! Pure calculation functions are in the [`pure`] module, while I/O wrappers
//! are in [`effects_wrappers`]. This separation enables fast unit testing
//! of the core algorithms.

pub mod cognitive;
pub mod cyclomatic;
pub mod effects_wrappers;
pub mod entropy;
pub mod entropy_analysis;
pub mod entropy_core;
pub mod entropy_traits;
pub mod if_else_analyzer;
pub mod languages;
pub mod match_patterns;
pub mod message_generator;
pub mod pattern_adjustments;
pub mod patterns;
pub mod pure;
pub mod pure_mapping_patterns;
pub mod recursive_detector;
pub mod rust_normalizer;
pub mod semantic_normalizer;

// Re-export semantic normalization functions (spec 79)
pub use semantic_normalizer::{calculate_cognitive_normalized, calculate_cognitive_visitor_based};
pub mod threshold_manager;
pub mod token_classifier;
pub mod visitor_detector;
pub mod weighted;

use crate::core::FunctionMetrics;

// Re-export EntropyAnalysis as the unified entropy type (Spec 218)
// This is the SINGLE SOURCE OF TRUTH for entropy analysis data.
pub use entropy_core::{aggregate_entropy, EntropyAnalysis};

// Re-export weighted complexity types (spec 121)
pub use weighted::{ComplexityNormalization, ComplexityWeights, WeightedComplexity};

// Re-export pure complexity functions (spec 196)
// These pure functions operate directly on AST and are much faster to test
pub use pure::{
    calculate_cognitive_for_block, calculate_cognitive_pure, calculate_cyclomatic_pure,
    calculate_max_nesting_depth, calculate_nesting_depth, count_branches, detect_complex_matches,
    detect_patterns_pure, is_pure_mapping_match, Pattern,
};

// Re-export effect wrappers for I/O operations (spec 196)
pub use effects_wrappers::{
    analyze_complexity_effect, calculate_cognitive_effect, calculate_cognitive_from_string,
    calculate_cyclomatic_effect, calculate_cyclomatic_from_string, detect_patterns_effect,
    detect_patterns_from_string, ComplexityResult,
};

#[derive(Clone, Debug)]
pub struct ComplexityCalculator {
    cyclomatic_threshold: u32,
    cognitive_threshold: u32,
}

impl ComplexityCalculator {
    pub fn new(cyclomatic_threshold: u32, cognitive_threshold: u32) -> Self {
        Self {
            cyclomatic_threshold,
            cognitive_threshold,
        }
    }

    pub fn is_complex(&self, metrics: &FunctionMetrics) -> bool {
        metrics.cyclomatic > self.cyclomatic_threshold
            || metrics.cognitive > self.cognitive_threshold
    }

    pub fn calculate_score(&self, metrics: &FunctionMetrics) -> u32 {
        let cyclo_score = (metrics.cyclomatic as f64 / self.cyclomatic_threshold as f64) * 50.0;
        let cognitive_score = (metrics.cognitive as f64 / self.cognitive_threshold as f64) * 50.0;
        (cyclo_score + cognitive_score) as u32
    }
}

pub fn combine_complexity(a: u32, b: u32) -> u32 {
    a + b
}

pub fn max_complexity(complexities: &[u32]) -> u32 {
    complexities.iter().copied().max().unwrap_or(0)
}

pub fn average_complexity(complexities: &[u32]) -> f64 {
    if complexities.is_empty() {
        return 0.0;
    }
    let sum: u32 = complexities.iter().sum();
    sum as f64 / complexities.len() as f64
}
