optirs-tpu 0.3.1

// Computation Graph Building and Management
//
// This module provides functionality for building, analyzing, and managing XLA computation graphs,
// including type inference, shape analysis, dependency tracking, and constant folding.

use scirs2_core::numeric::Float;
use std::collections::{HashMap, HashSet, VecDeque};
use std::fmt::Debug;
use std::marker::PhantomData;
use std::time::Duration;

use super::types::{
    ComputationId, ComputationMetadata, ElementType, InputSpecification, LayoutHint, OperandId,
    OperandType, OperationId, OperationType, OutputSpecification, PerformanceHint, TensorShape,
    XLAComputation, XLAOperation,
};
use crate::error::Result;

/// Computation graph builder for XLA
#[derive(Debug)]
pub struct ComputationGraphBuilder<T: Float + Debug + Send + Sync + 'static> {
    /// Current computation being built
    current_computation: Option<XLAComputation<T>>,

    /// Operation counter for unique IDs
    operation_counter: usize,

    /// Symbol table for named operations
    symbol_table: HashMap<String, OperationId>,

    /// Type inference engine
    type_inference: TypeInferenceEngine<T>,

    /// Shape analysis
    shape_analyzer: ShapeAnalyzer<T>,

    /// Dependency tracker
    dependency_tracker: DependencyTracker,

    /// Constant folder
    constant_folder: ConstantFolder<T>,
}

impl<T: Float + Debug + Default + Clone + Send + Sync + 'static> Default
    for ComputationGraphBuilder<T>
{
    fn default() -> Self {
        Self::new()
    }
}

impl<T: Float + Debug + Default + Clone + Send + Sync + 'static> ComputationGraphBuilder<T> {
    pub fn new() -> Self {
        Self {
            current_computation: None,
            operation_counter: 0,
            symbol_table: HashMap::new(),
            type_inference: TypeInferenceEngine::new(),
            shape_analyzer: ShapeAnalyzer::new(),
            dependency_tracker: DependencyTracker::new(),
            constant_folder: ConstantFolder::new(),
        }
    }
}

/// Type inference engine
#[derive(Debug)]
pub struct TypeInferenceEngine<T: Float + Debug + Send + Sync + 'static> {
    /// Type rules
    type_rules: Vec<TypeRule>,

    /// Type environment
    type_environment: TypeEnvironment<T>,

    /// Constraint solver
    constraint_solver: ConstraintSolver<T>,
}

impl<T: Float + Debug + Send + Sync + 'static> Default for TypeInferenceEngine<T> {
    fn default() -> Self {
        Self::new()
    }
}

impl<T: Float + Debug + Send + Sync + 'static> TypeInferenceEngine<T> {
    pub fn new() -> Self {
        Self {
            type_rules: Vec::new(),
            type_environment: TypeEnvironment::new(),
            constraint_solver: ConstraintSolver::new(),
        }
    }
}

/// Type rule
#[derive(Debug, Clone)]
pub struct TypeRule {
    pub rule_name: String,
    pub premise: Vec<OperandTypeConstraint>,
    pub conclusion: OperandTypeConstraint,
}

/// Operand type constraint for type checking
#[derive(Debug, Clone)]
pub enum OperandTypeConstraint {
    HasType(OperandId, OperandType<f64>), // Simplified with f64
    SameType(OperandId, OperandId),
    Compatible(OperandId, OperandId),
    Broadcastable(OperandId, OperandId),
}

/// Type environment
#[derive(Debug)]
pub struct TypeEnvironment<T: Float + Debug + Send + Sync + 'static> {
    /// Type bindings
    bindings: HashMap<OperandId, OperandType<T>>,

    /// Type constraints
    constraints: Vec<OperandTypeConstraint>,

    /// Unification state
    unification_state: UnificationState<T>,
}

impl<T: Float + Debug + Send + Sync + 'static> Default for TypeEnvironment<T> {
    fn default() -> Self {
        Self::new()
    }
}

impl<T: Float + Debug + Send + Sync + 'static> TypeEnvironment<T> {
    pub fn new() -> Self {
        Self {
            bindings: HashMap::new(),
            constraints: Vec::new(),
            unification_state: UnificationState::new(),
        }
    }
}

/// Unification state
#[derive(Debug)]
pub struct UnificationState<T: Float + Debug + Send + Sync + 'static> {
    /// Substitutions
    substitutions: HashMap<OperandId, OperandId>,

    /// Type variables
    type_variables: HashSet<OperandId>,
    _phantom: PhantomData<T>,
}

impl<T: Float + Debug + Send + Sync + 'static> Default for UnificationState<T> {
    fn default() -> Self {
        Self::new()
    }
}

impl<T: Float + Debug + Send + Sync + 'static> UnificationState<T> {
    pub fn new() -> Self {
        Self {
            substitutions: HashMap::new(),
            type_variables: HashSet::new(),
            _phantom: PhantomData,
        }
    }
}

/// Constraint solver
#[derive(Debug)]
pub struct ConstraintSolver<T: Float + Debug + Send + Sync + 'static> {
    /// Solving algorithm
    algorithm: SolvingAlgorithm,

    /// Constraint queue
    constraint_queue: VecDeque<OperandTypeConstraint>,

    /// Solution state
    solution_state: SolutionState<T>,
}

impl<T: Float + Debug + Send + Sync + 'static> Default for ConstraintSolver<T> {
    fn default() -> Self {
        Self::new()
    }
}

impl<T: Float + Debug + Send + Sync + 'static> ConstraintSolver<T> {
    pub fn new() -> Self {
        Self {
            algorithm: SolvingAlgorithm::UnificationBased,
            constraint_queue: VecDeque::new(),
            solution_state: SolutionState::new(),
        }
    }
}

/// Solving algorithms
#[derive(Debug, Clone, Copy)]
pub enum SolvingAlgorithm {
    UnificationBased,
    ConstraintPropagation,
    GraphColoring,
    SatisfiabilityModuloTheories,
}

/// Solution state
#[derive(Debug)]
pub struct SolutionState<T: Float + Debug + Send + Sync + 'static> {
    /// Solved types
    solved_types: HashMap<OperandId, OperandType<T>>,

    /// Unsolved constraints
    unsolved_constraints: Vec<OperandTypeConstraint>,

    /// Solver statistics
    statistics: SolverStatistics,
}

impl<T: Float + Debug + Send + Sync + 'static> Default for SolutionState<T> {
    fn default() -> Self {
        Self::new()
    }
}

impl<T: Float + Debug + Send + Sync + 'static> SolutionState<T> {
    pub fn new() -> Self {
        Self {
            solved_types: HashMap::new(),
            unsolved_constraints: Vec::new(),
            statistics: SolverStatistics::default(),
        }
    }
}

/// Solver statistics
#[derive(Debug, Clone, Default)]
pub struct SolverStatistics {
    pub constraints_processed: usize,
    pub unifications_performed: usize,
    pub backtracking_steps: usize,
    pub solving_time: Duration,
}

/// Shape analyzer
#[derive(Debug)]
pub struct ShapeAnalyzer<T: Float + Debug + Send + Sync + 'static> {
    /// Shape inference rules
    inference_rules: Vec<ShapeInferenceRule>,

    /// Shape constraints
    constraints: Vec<ShapeConstraint>,

    /// Shape propagation engine
    propagation_engine: ShapePropagationEngine<T>,
    _phantom: PhantomData<T>,
}

impl<T: Float + Debug + Send + Sync + 'static> Default for ShapeAnalyzer<T> {
    fn default() -> Self {
        Self::new()
    }
}

impl<T: Float + Debug + Send + Sync + 'static> ShapeAnalyzer<T> {
    pub fn new() -> Self {
        Self {
            inference_rules: Vec::new(),
            constraints: Vec::new(),
            propagation_engine: ShapePropagationEngine::new(),
            _phantom: PhantomData,
        }
    }
}

/// Shape inference rule
#[derive(Debug, Clone)]
pub struct ShapeInferenceRule {
    pub operation_type: OperationType,
    pub inputshapes: Vec<TensorShape>,
    pub outputshape: TensorShape,
    pub conditions: Vec<ShapeCondition>,
}

/// Shape condition
#[derive(Debug, Clone)]
pub enum ShapeCondition {
    SameDimension(usize, usize),
    BroadcastableShapes,
    ValidConvolution,
    ValidReduction,
}

/// Shape constraint
#[derive(Debug, Clone)]
pub enum ShapeConstraint {
    Exact(TensorShape),
    Rank(usize),
    MinRank(usize),
    MaxRank(usize),
    DimensionEqual(usize, usize),
    DimensionMultiple(usize, usize),
}

/// Type constraint
#[derive(Debug, Clone)]
pub enum TypeConstraint {
    Exact(ElementType),
    Numeric,
    Floating,
    Integer,
    Complex,
}

/// Value constraint
#[derive(Debug, Clone)]
pub enum ValueConstraint<T: Float + Debug + Send + Sync + 'static> {
    Constant(T),
    Range(T, T),
    Positive,
    Negative,
    Zero,
    NonZero,
}

/// Pattern constraint
#[derive(Debug, Clone)]
pub enum PatternConstraint<T: Float + Debug + Send + Sync + 'static> {
    Shape(ShapeConstraint),
    Type(TypeConstraint),
    Value(ValueConstraint<T>),
    Custom(String),
}

/// Shape propagation engine
#[derive(Debug)]
pub struct ShapePropagationEngine<T: Float + Debug + Send + Sync + 'static> {
    /// Propagation queue
    propagation_queue: VecDeque<OperationId>,

    /// Shape bindings
    shape_bindings: HashMap<OperandId, TensorShape>,

    /// Propagation statistics
    statistics: PropagationStatistics,

    /// Phantom data for type parameter
    _phantom: std::marker::PhantomData<T>,
}

impl<T: Float + Debug + Send + Sync + 'static> Default for ShapePropagationEngine<T> {
    fn default() -> Self {
        Self::new()
    }
}

impl<T: Float + Debug + Send + Sync + 'static> ShapePropagationEngine<T> {
    pub fn new() -> Self {
        Self {
            propagation_queue: VecDeque::new(),
            shape_bindings: HashMap::new(),
            statistics: PropagationStatistics::default(),
            _phantom: PhantomData,
        }
    }
}

/// Propagation statistics
#[derive(Debug, Clone, Default)]
pub struct PropagationStatistics {
    pub operations_processed: usize,
    pub shapes_inferred: usize,
    pub propagation_rounds: usize,
    pub convergence_time: Duration,
}

/// Dependency tracker
#[derive(Debug)]
pub struct DependencyTracker {
    /// Data dependencies
    data_dependencies: HashMap<OperationId, Vec<OperationId>>,

    /// Control dependencies
    control_dependencies: HashMap<OperationId, Vec<OperationId>>,

    /// Memory dependencies
    memory_dependencies: HashMap<OperationId, Vec<OperationId>>,

    /// Dependency analysis
    analysis: DependencyAnalysis,
}

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

impl DependencyTracker {
    pub fn new() -> Self {
        Self {
            data_dependencies: HashMap::new(),
            control_dependencies: HashMap::new(),
            memory_dependencies: HashMap::new(),
            analysis: DependencyAnalysis::new(),
        }
    }
}

/// Dependency analysis
#[derive(Debug)]
pub struct DependencyAnalysis {
    /// Critical path
    critical_path: Vec<OperationId>,

    /// Parallelizable operations
    parallelizable_ops: Vec<Vec<OperationId>>,

    /// Bottleneck operations
    bottlenecks: Vec<OperationId>,
}

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

impl DependencyAnalysis {
    pub fn new() -> Self {
        Self {
            critical_path: Vec::new(),
            parallelizable_ops: Vec::new(),
            bottlenecks: Vec::new(),
        }
    }
}

/// Constant folder
#[derive(Debug)]
pub struct ConstantFolder<T: Float + Debug + Send + Sync + 'static> {
    /// Folding rules
    folding_rules: Vec<FoldingRule<T>>,

    /// Constant table
    constant_table: HashMap<OperandId, T>,

    /// Folding statistics
    statistics: FoldingStatistics,
}

impl<T: Float + Debug + Send + Sync + 'static> Default for ConstantFolder<T> {
    fn default() -> Self {
        Self::new()
    }
}

impl<T: Float + Debug + Send + Sync + 'static> ConstantFolder<T> {
    pub fn new() -> Self {
        Self {
            folding_rules: Vec::new(),
            constant_table: HashMap::new(),
            statistics: FoldingStatistics::default(),
        }
    }
}

/// Folding rule
#[derive(Debug, Clone)]
pub struct FoldingRule<T: Float + Debug + Send + Sync + 'static> {
    pub operation_type: OperationType,
    pub folder_function: String, // Function identifier
    pub applicability: FoldingApplicability,
    _phantom: std::marker::PhantomData<T>,
}

/// Folding applicability
#[derive(Debug, Clone)]
pub enum FoldingApplicability {
    Always,
    ConditionalOnInputs,
    ConditionalOnSize,
    Never,
}

/// Folding statistics
#[derive(Debug, Clone, Default)]
pub struct FoldingStatistics {
    pub constants_folded: usize,
    pub operations_eliminated: usize,
    pub memory_saved: usize,
    pub estimated_speedup: f64,
}

/// Pattern condition
#[derive(Debug, Clone)]
pub enum PatternCondition<T: Float + Debug + Send + Sync + 'static> {
    ShapeConstraint(ShapeConstraint),
    TypeConstraint(TypeConstraint),
    ValueConstraint(ValueConstraint<T>),
    CustomConstraint(String),
}

/// Pattern match result
#[derive(Debug, Clone)]
pub struct PatternMatch {
    pub pattern_name: String,
    pub matched_operations: Vec<OperationId>,
    pub match_confidence: f64,
    pub transformation_benefit: f64,
}

/// Dependency graph for parallel compilation
#[derive(Debug)]
pub struct DependencyGraph<T: Float + Debug + Send + Sync + 'static> {
    pub nodes: HashMap<TaskId, CompilationTask<T>>,
    pub edges: HashMap<TaskId, Vec<TaskId>>,
    pub topological_order: Option<Vec<TaskId>>,
}

/// Task identifier for parallel compilation
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct TaskId(pub usize);

/// Compilation task
#[derive(Debug)]
pub struct CompilationTask<T: Float + Debug + Send + Sync + 'static> {
    pub id: TaskId,
    pub computation: XLAComputation<T>,
    pub priority: TaskPriority,
    pub dependencies: Vec<TaskId>,
    pub estimated_duration: Duration,
}

/// Task priority levels
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub enum TaskPriority {
    Low,
    Medium,
    High,
    Critical,
}

/// Resolution strategies for dependency resolution
#[derive(Debug, Clone, Copy)]
pub enum ResolutionStrategy {
    TopologicalSort,
    KahnsAlgorithm,
    DepthFirstSearch,
    BreadthFirstSearch,
}

/// Circular dependency handler
#[derive(Debug)]
pub struct CircularDependencyHandler {
    pub detection_method: CircularDetectionMethod,
    pub resolution_method: CircularResolutionMethod,
}

/// Circular dependency detection methods
#[derive(Debug, Clone, Copy)]
pub enum CircularDetectionMethod {
    DepthFirstSearch,
    TarjanAlgorithm,
    JohnsonAlgorithm,
}

/// Circular dependency resolution methods
#[derive(Debug, Clone, Copy)]
pub enum CircularResolutionMethod {
    BreakCycle,
    ReportError,
    ForcedResolution,
}