//! Runtime optimizer for adaptive compilation

use crate::error::CoreResult;
use std::collections::HashMap;
use std::time::{Duration, Instant};

/// Runtime optimizer for adaptive compilation
#[derive(Debug)]
pub struct RuntimeOptimizer {
    /// Optimization strategies
    #[allow(dead_code)]
    strategies: HashMap<String, OptimizationStrategy>,
    /// Performance feedback
    #[allow(dead_code)]
    performance_feedback: Vec<PerformanceFeedback>,
    /// Adaptation rules
    #[allow(dead_code)]
    adaptation_rules: Vec<AdaptationRule>,
    /// Current optimization state
    #[allow(dead_code)]
    current_state: OptimizationState,
}

/// Optimization strategy
#[derive(Debug, Clone)]
pub struct OptimizationStrategy {
    /// Strategy name
    pub name: String,
    /// Strategy description
    pub description: String,
    /// Strategy parameters
    pub parameters: HashMap<String, f64>,
    /// Effectiveness score
    pub effectiveness_score: f64,
    /// Applicable conditions
    pub applicable_conditions: Vec<String>,
}

/// Performance feedback
#[derive(Debug, Clone)]
pub struct PerformanceFeedback {
    /// Function name
    pub function_name: String,
    /// Optimization applied
    pub optimization_applied: String,
    /// Performance before
    pub performance_before: f64,
    /// Performance after
    pub performance_after: f64,
    /// Improvement ratio
    pub improvement_ratio: f64,
    /// Feedback timestamp
    pub timestamp: Instant,
}

/// Adaptation rule
#[derive(Debug, Clone)]
pub struct AdaptationRule {
    /// Rule name
    pub name: String,
    /// Condition
    pub condition: String,
    /// Action
    pub action: String,
    /// Priority
    pub priority: u8,
    /// Success count
    pub success_count: u64,
    /// Total applications
    pub total_applications: u64,
}

/// Current optimization state
#[derive(Debug, Clone)]
pub struct OptimizationState {
    /// Active optimizations
    pub active_optimizations: HashMap<String, String>,
    /// Performance baselines
    pub performancebaselines: HashMap<String, f64>,
    /// Adaptation history
    pub adaptation_history: Vec<AdaptationEvent>,
    /// State timestamp
    pub timestamp: Instant,
}

/// Adaptation event
#[derive(Debug, Clone)]
pub struct AdaptationEvent {
    /// Event type
    pub event_type: String,
    /// Event description
    pub description: String,
    /// Performance impact
    pub performance_impact: f64,
    /// Event timestamp
    pub timestamp: Instant,
}

/// Performance analysis results
#[derive(Debug, Clone)]
pub struct PerformanceAnalysis {
    /// Optimization suggestions
    pub optimization_suggestions: Vec<String>,
    /// Identified bottlenecks
    pub bottlenecks: Vec<String>,
    /// Confidence score for analysis
    pub confidence_score: f64,
}

/// Optimization candidate
#[derive(Debug)]
pub struct OptimizationCandidate {
    /// Kernel name
    pub name: String,
    /// Current performance
    pub current_performance: f64,
    /// Optimization potential
    pub optimization_potential: f64,
}

/// Performance improvement
#[derive(Debug)]
pub struct PerformanceImprovement {
    /// Kernel name
    pub kernel_name: String,
    /// Improvement factor
    pub improvement_factor: f64,
    /// Old performance metric
    pub old_performance: f64,
    /// New performance metric
    pub new_performance: f64,
}

/// Optimization failure
#[derive(Debug)]
pub struct OptimizationFailure {
    /// Kernel name
    pub kernel_name: String,
    /// Error description
    pub error: String,
}

/// Optimization results
#[derive(Debug)]
pub struct OptimizationResults {
    /// Number of kernels optimized
    pub kernels_optimized: u32,
    /// Performance improvements achieved
    pub performance_improvements: Vec<PerformanceImprovement>,
    /// Failed optimization attempts
    pub failed_optimizations: Vec<OptimizationFailure>,
}

impl RuntimeOptimizer {
    pub fn new() -> CoreResult<Self> {
        Ok(Self {
            strategies: HashMap::new(),
            performance_feedback: Vec::new(),
            adaptation_rules: Vec::new(),
            current_state: OptimizationState {
                active_optimizations: HashMap::new(),
                performancebaselines: HashMap::new(),
                adaptation_history: Vec::new(),
                timestamp: Instant::now(),
            },
        })
    }

    pub fn record_execution(
        &mut self,
        _kernel_name: &str,
        execution_time: Duration,
    ) -> CoreResult<()> {
        // Simplified implementation
        Ok(())
    }

    /// Analyze performance metrics
    pub fn analyze_performance(&self) -> CoreResult<PerformanceAnalysis> {
        // Simplified implementation
        Ok(PerformanceAnalysis {
            optimization_suggestions: vec!["Enable vectorization".to_string()],
            bottlenecks: vec!["Memory bandwidth".to_string()],
            confidence_score: 0.8,
        })
    }
}
