quantrs2-circuit 0.1.3

//! ML-based optimization and compilation helpers
//!
//! This module contains the ML compilation optimizer, feature extractors,
//! and internal helper types for cross-compilation.

use super::config::{EnhancedCrossCompilationConfig, TargetPlatform};
use super::types::{IRGate, QuantumIR, SourceCircuit, TargetCode};
use quantrs2_core::error::QuantRS2Result;
use std::collections::HashMap;
use std::sync::{Arc, Mutex};

/// ML compilation optimizer
pub struct MLCompilationOptimizer {
    config: EnhancedCrossCompilationConfig,
    model: Arc<Mutex<CompilationModel>>,
    feature_extractor: Arc<CompilationFeatureExtractor>,
}

impl MLCompilationOptimizer {
    pub fn new(config: EnhancedCrossCompilationConfig) -> Self {
        Self {
            config,
            model: Arc::new(Mutex::new(CompilationModel::new())),
            feature_extractor: Arc::new(CompilationFeatureExtractor::new()),
        }
    }

    pub fn optimize(&self, ir: &QuantumIR, target: TargetPlatform) -> QuantRS2Result<QuantumIR> {
        use quantrs2_core::error::QuantRS2Error;

        let features = self.feature_extractor.extract_features(ir, target)?;

        {
            let model = self
                .model
                .lock()
                .map_err(|e| QuantRS2Error::RuntimeError(format!("Model lock poisoned: {e}")))?;
            let _optimization_strategy = model.predict_strategy(&features)?;
        } // Early drop the lock guard

        // Apply ML-guided optimizations
        let optimized = Self::apply_ml_optimizations(ir);

        Ok(optimized)
    }

    fn apply_ml_optimizations(ir: &QuantumIR) -> QuantumIR {
        // Apply predicted transformations
        // TODO: Implement apply_transform method
        // for transform in &strategy.transformations {
        //     optimized = Self::apply_transform(&optimized, transform)?;
        // }

        ir.clone()
    }
}

/// Compilation monitor
pub struct CompilationMonitor {
    config: EnhancedCrossCompilationConfig,
    metrics: Arc<Mutex<CompilationMetrics>>,
}

impl CompilationMonitor {
    pub fn new(config: EnhancedCrossCompilationConfig) -> Self {
        Self {
            config,
            metrics: Arc::new(Mutex::new(CompilationMetrics::new())),
        }
    }

    pub fn update_optimization_progress(&self, ir: &QuantumIR) -> QuantRS2Result<()> {
        use quantrs2_core::error::QuantRS2Error;

        let anomaly = {
            let mut metrics = self
                .metrics
                .lock()
                .map_err(|e| QuantRS2Error::RuntimeError(format!("Metrics lock poisoned: {e}")))?;
            metrics.update(ir)?;
            metrics.detect_anomaly()
        }; // Early drop the lock guard

        // Check for anomalies
        if anomaly {
            // Handle anomaly
        }

        Ok(())
    }
}

/// Compilation validator
pub struct CompilationValidator {
    config: EnhancedCrossCompilationConfig,
}

impl CompilationValidator {
    pub const fn new(config: EnhancedCrossCompilationConfig) -> Self {
        Self { config }
    }

    pub fn validate_compilation(
        &self,
        source: &SourceCircuit,
        target_code: &TargetCode,
        platform: TargetPlatform,
    ) -> QuantRS2Result<super::types::ValidationResult> {
        let mut result = super::types::ValidationResult::new();

        // Semantic validation
        if self.config.base_config.preserve_semantics {
            let semantic_valid = self.validate_semantics(source, target_code)?;
            result.semantic_validation = Some(semantic_valid);
        }

        // Resource validation
        let resource_valid = self.validate_resources(target_code, platform)?;
        result.resource_validation = Some(resource_valid);

        // Fidelity validation
        let fidelity = self.estimate_fidelity(source, target_code)?;
        result.fidelity_estimate = Some(fidelity);

        result.is_valid = result.semantic_validation.unwrap_or(true)
            && result.resource_validation.unwrap_or(true)
            && fidelity >= self.config.base_config.validation_threshold;

        Ok(result)
    }

    pub const fn validate_semantics(
        &self,
        _source: &SourceCircuit,
        _target: &TargetCode,
    ) -> QuantRS2Result<bool> {
        // Semantic validation logic
        Ok(true)
    }

    pub const fn validate_resources(
        &self,
        _target: &TargetCode,
        _platform: TargetPlatform,
    ) -> QuantRS2Result<bool> {
        // Resource validation logic
        Ok(true)
    }

    pub const fn estimate_fidelity(
        &self,
        _source: &SourceCircuit,
        _target: &TargetCode,
    ) -> QuantRS2Result<f64> {
        // Fidelity estimation logic
        Ok(0.99)
    }
}

/// ML optimization strategy
pub struct MLOptimizationStrategy {
    pub transformations: Vec<IRTransformation>,
    pub confidence: f64,
}

/// IR transformation
pub struct IRTransformation {
    pub transform_type: TransformationType,
    pub parameters: HashMap<String, f64>,
}

/// Transformation type
pub enum TransformationType {
    GateFusion,
    RotationMerging,
    Commutation,
    Decomposition,
}

/// Compilation model
pub struct CompilationModel {
    // ML model implementation
}

impl CompilationModel {
    pub const fn new() -> Self {
        Self {}
    }

    pub const fn predict_strategy(
        &self,
        _features: &CompilationFeatures,
    ) -> QuantRS2Result<MLOptimizationStrategy> {
        // Placeholder implementation
        Ok(MLOptimizationStrategy {
            transformations: vec![],
            confidence: 0.9,
        })
    }
}

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

/// Compilation feature extractor
pub struct CompilationFeatureExtractor {
    // Feature extraction logic
}

impl CompilationFeatureExtractor {
    pub const fn new() -> Self {
        Self {}
    }

    pub const fn extract_features(
        &self,
        _ir: &QuantumIR,
        _target: TargetPlatform,
    ) -> QuantRS2Result<CompilationFeatures> {
        Ok(CompilationFeatures {
            circuit_features: vec![],
            target_features: vec![],
            complexity_features: vec![],
        })
    }
}

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

/// Compilation features
pub struct CompilationFeatures {
    pub circuit_features: Vec<f64>,
    pub target_features: Vec<f64>,
    pub complexity_features: Vec<f64>,
}

/// Compilation metrics
pub struct CompilationMetrics {
    pub gate_count: usize,
    pub circuit_depth: usize,
    pub optimization_count: usize,
}

impl CompilationMetrics {
    pub const fn new() -> Self {
        Self {
            gate_count: 0,
            circuit_depth: 0,
            optimization_count: 0,
        }
    }

    pub fn update(&mut self, ir: &QuantumIR) -> QuantRS2Result<()> {
        self.gate_count = ir.operations.len();
        // Calculate depth and other metrics
        Ok(())
    }

    pub const fn detect_anomaly(&self) -> bool {
        // Simple anomaly detection
        false
    }
}

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

/// Target specification
pub struct TargetSpecification {
    pub native_gates: Vec<IRGate>,
    pub connectivity: Vec<(usize, usize)>,
    pub error_rates: HashMap<String, f64>,
}

/// Compilation cache
pub struct CompilationCache {
    pub cache: HashMap<(String, TargetPlatform), super::types::CrossCompilationResult>,
}

impl CompilationCache {
    pub fn new() -> Self {
        Self {
            cache: HashMap::new(),
        }
    }
}

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