quantrs2-anneal 0.1.3

//! Compilation engine and related types.
//!
//! This module contains types for the compilation process,
//! including compilation results, caching, and optimization passes.

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

use super::config::OptimizationLevel;
use super::platform::QuantumPlatform;

/// Compilation engine
pub struct CompilationEngine {
    /// Engine configuration
    pub config: CompilationEngineConfig,
    /// Platform-specific compilers
    pub platform_compilers: HashMap<QuantumPlatform, PlatformCompiler>,
    /// Optimization passes
    pub optimization_passes: Vec<OptimizationPass>,
    /// Compilation cache
    pub compilation_cache: CompilationCache,
}

impl CompilationEngine {
    /// Create a new compilation engine
    pub fn new() -> Self {
        Self {
            config: CompilationEngineConfig {
                enable_caching: true,
                optimization_timeout: Duration::from_secs(300),
                parallel_compilation: true,
                verification_level: VerificationLevel::Standard,
            },
            platform_compilers: HashMap::new(),
            optimization_passes: vec![],
            compilation_cache: CompilationCache {
                entries: HashMap::new(),
                config: CacheConfig {
                    max_entries: 1000,
                    entry_ttl: Duration::from_secs(3600),
                    eviction_policy: EvictionPolicy::LRU,
                },
                statistics: CacheStatistics {
                    hits: 0,
                    misses: 0,
                    hit_rate: 0.0,
                    cache_size: 0,
                },
            },
        }
    }
}

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

/// Compilation engine configuration
#[derive(Debug, Clone)]
pub struct CompilationEngineConfig {
    /// Enable compilation caching
    pub enable_caching: bool,
    /// Optimization timeout
    pub optimization_timeout: Duration,
    /// Enable parallel compilation
    pub parallel_compilation: bool,
    /// Verification level
    pub verification_level: VerificationLevel,
}

/// Verification levels
#[derive(Debug, Clone, PartialEq)]
pub enum VerificationLevel {
    /// No verification
    None,
    /// Basic verification
    Basic,
    /// Standard verification
    Standard,
    /// Full verification
    Full,
}

/// Platform-specific compiler
#[derive(Debug, Clone)]
pub struct PlatformCompiler {
    /// Platform
    pub platform: QuantumPlatform,
    /// Compiler version
    pub version: String,
    /// Supported features
    pub supported_features: Vec<String>,
}

/// Optimization pass
#[derive(Debug, Clone)]
pub struct OptimizationPass {
    /// Pass name
    pub name: String,
    /// Pass priority
    pub priority: i32,
    /// Pass enabled
    pub enabled: bool,
}

/// Compilation cache
#[derive(Debug)]
pub struct CompilationCache {
    /// Cache entries
    pub entries: HashMap<String, CacheEntry>,
    /// Cache configuration
    pub config: CacheConfig,
    /// Cache statistics
    pub statistics: CacheStatistics,
}

/// Cache entry
#[derive(Debug, Clone)]
pub struct CacheEntry {
    /// Compiled data
    pub data: Vec<u8>,
    /// Entry timestamp
    pub timestamp: Instant,
    /// Access count
    pub access_count: u64,
}

/// Cache configuration
#[derive(Debug, Clone)]
pub struct CacheConfig {
    /// Maximum entries
    pub max_entries: usize,
    /// Entry TTL
    pub entry_ttl: Duration,
    /// Eviction policy
    pub eviction_policy: EvictionPolicy,
}

/// Eviction policies
#[derive(Debug, Clone, PartialEq)]
pub enum EvictionPolicy {
    /// Least recently used
    LRU,
    /// Least frequently used
    LFU,
    /// FIFO
    FIFO,
    /// Random
    Random,
}

/// Cache statistics
#[derive(Debug, Clone)]
pub struct CacheStatistics {
    /// Cache hits
    pub hits: u64,
    /// Cache misses
    pub misses: u64,
    /// Hit rate
    pub hit_rate: f64,
    /// Current cache size
    pub cache_size: usize,
}

/// Compilation result
#[derive(Debug, Clone)]
pub struct CompilationResult {
    /// Target platform
    pub platform: QuantumPlatform,
    /// Compiled representation
    pub compiled_representation: CompiledRepresentation,
    /// Compilation metadata
    pub metadata: CompilationMetadata,
    /// Resource requirements
    pub resource_requirements: CompiledResourceRequirements,
    /// Performance predictions
    pub performance_predictions: PerformancePredictions,
}

/// Compiled representation
#[derive(Debug, Clone)]
pub enum CompiledRepresentation {
    /// Native platform format
    Native(Vec<u8>),
    /// Intermediate representation
    IR(String),
    /// Hybrid representation
    Hybrid { native: Vec<u8>, ir: String },
}

/// Compilation metadata
#[derive(Debug, Clone)]
pub struct CompilationMetadata {
    /// Compilation timestamp
    pub timestamp: Instant,
    /// Compilation time
    pub compilation_time: Duration,
    /// Compiler version
    pub compiler_version: String,
    /// Optimization level
    pub optimization_level: OptimizationLevel,
    /// Passes applied
    pub passes_applied: Vec<String>,
}

/// Compiled resource requirements
#[derive(Debug, Clone)]
pub struct CompiledResourceRequirements {
    /// Qubits required
    pub qubits_required: usize,
    /// Estimated execution time
    pub estimated_execution_time: Duration,
    /// Memory requirements
    pub memory_requirements: usize,
    /// Classical compute requirements
    pub classical_compute: ClassicalComputeRequirements,
}

/// Classical compute requirements
#[derive(Debug, Clone)]
pub struct ClassicalComputeRequirements {
    /// CPU cores
    pub cpu_cores: usize,
    /// Memory in MB
    pub memory_mb: usize,
    /// Disk space in MB
    pub disk_space_mb: usize,
    /// Network bandwidth in Mbps
    pub network_bandwidth: f64,
}

/// Performance predictions
#[derive(Debug, Clone)]
pub struct PerformancePredictions {
    /// Success probability
    pub success_probability: f64,
    /// Expected solution quality
    pub expected_quality: f64,
    /// Time to solution
    pub time_to_solution: Duration,
    /// Cost estimate
    pub cost_estimate: f64,
    /// Confidence intervals
    pub confidence_intervals: ConfidenceIntervals,
}

/// Confidence intervals
#[derive(Debug, Clone)]
pub struct ConfidenceIntervals {
    /// Success probability interval
    pub success_probability: (f64, f64),
    /// Quality interval
    pub quality: (f64, f64),
    /// Time interval
    pub time: (Duration, Duration),
    /// Cost interval
    pub cost: (f64, f64),
}