lambdust 0.1.1

#![allow(unused_variables)]
//! Advanced macro system with procedural macros and enhanced debugging.
//!
//! This module extends the existing macro system with procedural macros,
//! advanced pattern matching, macro debugging capabilities, and enhanced
//! hygiene controls.

use super::code_generation::{AstTransformer, AstTemplate};
use crate::ast::Expr;
use crate::diagnostics::{Error, Result, Span, Spanned};
use crate::eval::{Value, Environment, Evaluator};
use crate::macro_system::{MacroExpander, Pattern, HygieneContext};
use crate::utils::{intern_symbol, SymbolId};
use std::collections::{HashMap, VecDeque};
use std::rc::Rc;

/// A procedural macro that can generate code programmatically.
#[derive(Debug, Clone)]
pub struct ProceduralMacroDefinition {
    /// Name of the macro
    pub name: String,
    /// The procedure that transforms input to output
    pub transformer: Value, // Should be a procedure
    /// Environment where the macro was defined
    pub definition_env: Rc<Environment>,
    /// Metadata associated with the macro
    pub metadata: HashMap<String, Value>,
    /// Source location
    pub source: Option<Span>,
}

/// Enhanced pattern matching for macros.
#[derive(Debug, Clone)]
pub enum AdvancedPattern {
    /// Basic patterns from the existing system
    Basic(Pattern),
    /// Conditional pattern with guard
    Conditional {
        /// The underlying pattern to match
        pattern: Box<AdvancedPattern>,
        /// The guard condition that must be satisfied
        guard: GuardExpression,
    },
    /// Typed pattern with type constraint
    Typed {
        /// The underlying pattern to match
        pattern: Box<AdvancedPattern>,
        /// The type constraint that must be satisfied
        type_constraint: TypeConstraint,
    },
    /// Range pattern for numbers
    Range {
        /// Minimum value (inclusive if specified)
        min: Option<f64>,
        /// Maximum value (inclusive/exclusive based on inclusive flag)
        max: Option<f64>,
        /// Whether the range bounds are inclusive
        inclusive: bool,
    },
    /// Regular expression pattern for strings
    Regex {
        /// The regular expression pattern string
        pattern: String,
        /// Regex flags (e.g., "i" for case-insensitive)
        flags: Vec<String>,
    },
    /// Destructuring pattern for complex data
    Destructure {
        /// The type of structure being destructured
        structure_type: StructureType,
        /// Patterns for each field of the structure
        field_patterns: Vec<(String, AdvancedPattern)>,
    },
    /// Sequence pattern with length constraints
    Sequence {
        /// Pattern that each element must match
        element_pattern: Box<AdvancedPattern>,
        /// Minimum number of elements required
        min_length: Option<usize>,
        /// Maximum number of elements allowed
        max_length: Option<usize>,
    },
    /// Optional pattern (may or may not match)
    Optional(Box<AdvancedPattern>),
    /// Alternative patterns (OR)
    Alternative(Vec<AdvancedPattern>),
    /// Combination patterns (AND)
    Combination(Vec<AdvancedPattern>),
}

/// Guard expression for conditional patterns.
#[derive(Debug, Clone)]
pub enum GuardExpression {
    /// Predicate function call
    Predicate(String),
    /// Comparison operation
    Comparison {
        /// The comparison operator to use
        operator: ComparisonOp,
        /// Variable name for left side of comparison
        left: String,
        /// Value for right side of comparison
        right: GuardValue,
    },
    /// Boolean combination
    And(Vec<GuardExpression>),
    /// Logical OR of multiple guard expressions
    Or(Vec<GuardExpression>),
    /// Logical NOT of a guard expression
    Not(Box<GuardExpression>),
}

/// Comparison operators for guards.
#[derive(Debug, Clone, PartialEq)]
pub enum ComparisonOp {
    /// Equality comparison
    Equal,
    /// Inequality comparison
    NotEqual,
    /// Less than comparison
    LessThan,
    /// Less than or equal comparison
    LessEqual,
    /// Greater than comparison
    GreaterThan,
    /// Greater than or equal comparison
    GreaterEqual,
}

/// Values in guard expressions.
#[derive(Debug, Clone)]
pub enum GuardValue {
    /// Literal value in guard expression
    Literal(Value),
    /// Variable reference in guard expression
    Variable(String),
    /// Nested expression in guard
    Expression(Spanned<Expr>),
}

/// Type constraints for patterns.
#[derive(Debug, Clone)]
pub enum TypeConstraint {
    /// Exact type match
    Exact(String),
    /// Subtype match
    Subtype(String),
    /// Interface match
    Interface(Vec<String>), // method names
    /// Custom predicate
    Predicate(String),
}

/// Structure types for destructuring.
#[derive(Debug, Clone, PartialEq)]
pub enum StructureType {
    /// List structure type
    List,
    /// Vector structure type
    Vector,
    /// Record structure type with name
    Record(String), // record type name
    /// General object structure type
    Object,         // general object
}

/// Macro debugging information.
#[derive(Debug, Clone)]
pub struct MacroDebugInfo {
    /// Macro name
    pub macro_name: String,
    /// Input expression
    pub input: Spanned<Expr>,
    /// Pattern that matched
    pub matched_pattern: String,
    /// Variable bindings
    pub bindings: HashMap<String, Value>,
    /// Output expression
    pub output: Spanned<Expr>,
    /// Expansion timestamp
    pub timestamp: std::time::SystemTime,
    /// Expansion depth
    pub depth: usize,
}

/// Macro expansion trace for debugging.
#[derive(Debug)]
pub struct MacroExpansionTrace {
    /// Expansion steps
    steps: VecDeque<MacroDebugInfo>,
    /// Maximum trace length
    max_length: usize,
}

impl MacroExpansionTrace {
    /// Creates a new expansion trace.
    pub fn new(max_length: usize) -> Self {
        Self {
            steps: VecDeque::new(),
            max_length,
        }
    }

    /// Adds a debug step to the trace.
    pub fn add_step(&mut self, debug_info: MacroDebugInfo) {
        if self.steps.len() >= self.max_length {
            self.steps.pop_front();
        }
        self.steps.push_back(debug_info);
    }

    /// Gets all steps in the trace.
    pub fn steps(&self) -> &VecDeque<MacroDebugInfo> {
        &self.steps
    }

    /// Clears the trace.
    pub fn clear(&mut self) {
        self.steps.clear();
    }

    /// Gets the most recent step.
    pub fn last_step(&self) -> Option<&MacroDebugInfo> {
        self.steps.back()
    }
}

/// Enhanced hygiene system with more control.
#[derive(Debug)]
pub struct EnhancedHygiene {
    /// Base hygiene context
    base_context: HygieneContext,
    /// Hygiene policies
    pub policies: HashMap<String, HygienePolicy>,
    /// Identifier scopes
    scopes: Vec<IdentifierScope>,
}

/// Hygiene policy for controlling identifier renaming.
#[derive(Debug, Clone)]
pub enum HygienePolicy {
    /// Strict hygiene (default R7RS behavior)
    Strict,
    /// Relaxed hygiene (allow some captures)
    Relaxed {
        /// Identifiers that are allowed to be captured
        allowed_captures: Vec<String>,
    },
    /// Custom hygiene with user-defined rules
    Custom {
        /// User-defined rules for identifier renaming
        rename_rules: Vec<RenameRule>,
    },
    /// No hygiene (dangerous but sometimes useful)
    None,
}

/// Rule for identifier renaming.
#[derive(Debug, Clone)]
pub struct RenameRule {
    /// Pattern to match identifiers
    pub pattern: String, // Could be regex
    /// Rename strategy
    pub strategy: RenameStrategy,
    /// Conditions for application
    pub conditions: Vec<RenameCondition>,
}

/// Strategy for renaming identifiers.
#[derive(Debug, Clone)]
pub enum RenameStrategy {
    /// Prefix with string
    Prefix(String),
    /// Suffix with string
    Suffix(String),
    /// Replace with string
    Replace(String),
    /// Use function to generate name
    Function(String), // function name
    /// Don't rename
    Keep,
}

/// Condition for rename rules.
#[derive(Debug, Clone)]
pub enum RenameCondition {
    /// Only in specific contexts
    Context(String),
    /// Only for specific types
    Type(String),
    /// Custom predicate
    Predicate(String),
}

/// Identifier scope for hygiene tracking.
#[derive(Debug, Clone)]
pub struct IdentifierScope {
    /// Scope name
    pub name: String,
    /// Bound identifiers
    pub bindings: HashMap<String, SymbolId>,
    /// Parent scope
    pub parent: Option<Box<IdentifierScope>>,
}

/// Macro debugger for interactive macro development.
#[derive(Debug)]
pub struct MacroDebugger {
    /// Expansion trace
    trace: MacroExpansionTrace,
    /// Breakpoints
    breakpoints: HashMap<String, BreakpointCondition>,
    /// Step mode
    pub step_mode: StepMode,
    /// Debug flags
    debug_flags: DebugFlags,
}

/// Breakpoint condition.
#[derive(Debug, Clone)]
pub enum BreakpointCondition {
    /// Break on macro name
    MacroName(String),
    /// Break on pattern match
    PatternMatch(String),
    /// Break on depth
    Depth(usize),
    /// Break on custom condition
    Custom(String), // predicate function name
}

/// Step mode for macro debugging.
#[derive(Debug, Clone, PartialEq)]
pub enum StepMode {
    /// No stepping
    None,
    /// Step into macro expansions
    Into,
    /// Step over macro expansions
    Over,
    /// Step out of current macro
    Out,
}

/// Debug flags for controlling debug output.
#[derive(Debug, Clone)]
pub struct DebugFlags {
    /// Show pattern matching details
    pub show_patterns: bool,
    /// Show variable bindings
    pub show_bindings: bool,
    /// Show hygiene transformations
    pub show_hygiene: bool,
    /// Show performance information
    pub show_performance: bool,
}

impl MacroDebugger {
    /// Creates a new macro debugger.
    pub fn new() -> Self {
        Self {
            trace: MacroExpansionTrace::new(1000),
            breakpoints: HashMap::new(),
            step_mode: StepMode::None,
            debug_flags: DebugFlags {
                show_patterns: false,
                show_bindings: false,
                show_hygiene: false,
                show_performance: false,
            },
        }
    }

    /// Sets a breakpoint.
    pub fn set_breakpoint(&mut self, name: String, condition: BreakpointCondition) {
        self.breakpoints.insert(name, condition);
    }

    /// Removes a breakpoint.
    pub fn remove_breakpoint(&mut self, name: &str) {
        self.breakpoints.remove(name);
    }

    /// Sets step mode.
    pub fn set_step_mode(&mut self, mode: StepMode) {
        self.step_mode = mode;
    }

    /// Checks if should break at current expansion.
    pub fn should_break(&self, debug_info: &MacroDebugInfo) -> bool {
        for condition in self.breakpoints.values() {
            match condition {
                BreakpointCondition::MacroName(name) => {
                    if debug_info.macro_name == *name {
                        return true;
                    }
                }
                BreakpointCondition::Depth(depth) => {
                    if debug_info.depth >= *depth {
                        return true;
                    }
                }
                _ => {
                    // Other conditions would be implemented
                }
            }
        }
        false
    }

    /// Gets the expansion trace.
    pub fn trace(&self) -> &MacroExpansionTrace {
        &self.trace
    }

    /// Gets mutable access to the trace.
    pub fn trace_mut(&mut self) -> &mut MacroExpansionTrace {
        &mut self.trace
    }
}

impl EnhancedHygiene {
    /// Creates a new enhanced hygiene system.
    pub fn new() -> Self {
        Self {
            base_context: HygieneContext::new(),
            policies: HashMap::new(),
            scopes: vec![],
        }
    }

    /// Sets a hygiene policy for a macro.
    pub fn set_policy(&mut self, macro_name: String, policy: HygienePolicy) {
        self.policies.insert(macro_name, policy);
    }

    /// Applies hygiene transformations with policy.
    pub fn apply_hygiene(
        &mut self,
        expr: Spanned<Expr>,
        macro_name: &str,
        definition_env: &Environment,
    ) -> Result<Spanned<Expr>> {
        let policy = self.policies.get(macro_name).cloned()
            .unwrap_or(HygienePolicy::Strict);

        match policy {
            HygienePolicy::Strict => {
                self.base_context.rename_identifiers(expr, definition_env)
            }
            HygienePolicy::None => Ok(expr),
            HygienePolicy::Relaxed { allowed_captures } => {
                self.apply_relaxed_hygiene(expr, definition_env, &allowed_captures)
            }
            HygienePolicy::Custom { rename_rules } => {
                self.apply_custom_hygiene(expr, definition_env, &rename_rules)
            }
        }
    }

    /// Applies relaxed hygiene with allowed captures.
    fn apply_relaxed_hygiene(
        &mut self,
        expr: Spanned<Expr>,
        definition_env: &Environment,
        allowed_captures: &[String],
    ) -> Result<Spanned<Expr>> {
        // Implement relaxed hygiene - allow specified identifiers to be captured
        // This is a simplified implementation
        match expr.inner {
            Expr::Identifier(ref name) => {
                if allowed_captures.contains(name) {
                    // Allow capture - don't rename
                    Ok(expr)
                } else {
                    // Apply strict hygiene
                    self.base_context.rename_identifiers(expr, definition_env)
                }
            }
            _ => {
                // Recursively apply to sub-expressions
                self.base_context.rename_identifiers(expr, definition_env)
            }
        }
    }

    /// Applies custom hygiene with rename rules.
    fn apply_custom_hygiene(
        &mut self,
        expr: Spanned<Expr>,
        _definition_env: &Environment,
        _rename_rules: &[RenameRule],
    ) -> Result<Spanned<Expr>> {
        // Custom hygiene implementation would go here
        // For now, just return the expression unchanged
        Ok(expr)
    }
}

/// Main procedural macro system.
#[derive(Debug)]
pub struct ProceduralMacro {
    /// Procedural macro definitions
    proc_macros: HashMap<String, ProceduralMacroDefinition>,
    /// Enhanced macro expander
    expander: MacroExpander,
    /// AST transformer for advanced patterns
    transformer: AstTransformer,
    /// Macro debugger
    debugger: MacroDebugger,
    /// Enhanced hygiene system
    hygiene: EnhancedHygiene,
}

impl ProceduralMacro {
    /// Creates a new procedural macro system.
    pub fn new() -> Self {
        Self {
            proc_macros: HashMap::new(),
            expander: MacroExpander::with_builtins(),
            transformer: AstTransformer::new(),
            debugger: MacroDebugger::new(),
            hygiene: EnhancedHygiene::new(),
        }
    }

    /// Gets a reference to the procedural macros map.
    pub fn proc_macros(&self) -> &HashMap<String, ProceduralMacroDefinition> {
        &self.proc_macros
    }

    /// Defines a procedural macro.
    pub fn define_procedural_macro(
        &mut self,
        name: String,
        transformer: Value,
        definition_env: Rc<Environment>,
    ) -> Result<()> {
        if !transformer.is_procedure() {
            return Err(Box::new(Error::runtime_error(
                "Procedural macro transformer must be a procedure".to_string(),
                None,
            )));
        }

        let proc_macro = ProceduralMacroDefinition {
            name: name.clone(),
            transformer,
            definition_env,
            metadata: HashMap::new(),
            source: None,
        };

        self.proc_macros.insert(name, proc_macro);
        Ok(())
    }

    /// Expands a procedural macro.
    pub fn expand_procedural_macro(
        &mut self,
        name: &str,
        input: &Spanned<Expr>,
        use_env: &Rc<Environment>,
    ) -> Result<Spanned<Expr>> {
        let proc_macro = self.proc_macros.get(name)
            .ok_or_else(|| Error::runtime_error(
                format!("Unknown procedural macro: {name}"),
                Some(input.span),
            ))?;

        // Create evaluator for transformer execution
        let mut evaluator = Evaluator::with_environment(proc_macro.definition_env.clone());

        // Convert input expression to value for transformer
        let input_value = self.expr_to_value(input)?;

        // Call the transformer procedure by evaluating a procedure call
        let call_expr = Spanned::new(
            Expr::Application {
                operator: Box::new(Spanned::new(Expr::Identifier("transformer".to_string()), input.span)),
                operands: vec![Spanned::new(Expr::Identifier("input".to_string()), input.span)],
            },
            input.span
        );
        
        // Create temporary environment with transformer and input bound
        let temp_env = Rc::new(Environment::new(None, 0));
        temp_env.define("transformer".to_string(), proc_macro.transformer.clone());
        temp_env.define("input".to_string(), input_value);
        
        let result_value = evaluator.eval(&call_expr, temp_env)?;

        // Convert result back to expression
        let result_expr = self.value_to_expr(&result_value, input.span)?;

        // Apply hygiene
        let hygienic_result = self.hygiene.apply_hygiene(
            result_expr,
            name,
            &proc_macro.definition_env,
        )?;

        // Record debug information
        let debug_info = MacroDebugInfo {
            macro_name: name.to_string(),
            input: input.clone(),
            matched_pattern: "procedural".to_string(),
            bindings: HashMap::new(),
            output: hygienic_result.clone(),
            timestamp: std::time::SystemTime::now(),
            depth: 0, // Would track actual depth
        };

        if self.debugger.should_break(&debug_info) {
            // Handle breakpoint (in a real implementation, this would
            // provide interactive debugging capabilities)
        }

        self.debugger.trace_mut().add_step(debug_info);

        Ok(hygienic_result)
    }

    /// Expands macro with advanced pattern matching.
    pub fn expand_with_advanced_patterns(
        &mut self,
        pattern: &AdvancedPattern,
        template: &AstTemplate,
        input: &Spanned<Expr>,
    ) -> Result<Option<Spanned<Expr>>> {
        let mut bindings = HashMap::new();
        if self.match_advanced_pattern(pattern, input, &mut bindings)? {
            let result = self.expand_template_with_bindings(template, &bindings, input.span)?;
            Ok(Some(result))
        } else {
            Ok(None)
        }
    }

    /// Matches an advanced pattern against an expression.
    fn match_advanced_pattern(
        &self,
        pattern: &AdvancedPattern,
        expr: &Spanned<Expr>,
        bindings: &mut HashMap<String, Value>,
    ) -> Result<bool> {
        match pattern {
            AdvancedPattern::Basic(basic_pattern) => {
                // Use existing pattern matching
                match basic_pattern.match_expr(expr) {
                    Ok(pattern_bindings) => {
                        // Convert pattern bindings to our format
                        for (name, value) in pattern_bindings.bindings() {
                            // value is a single Spanned<Expr>
                            bindings.insert(name.to_string(), self.expr_to_value(value)?);
                        }
                        Ok(true)
                    }
                    Err(_) => Ok(false),
                }
            }

            AdvancedPattern::Conditional { pattern, guard } => {
                if self.match_advanced_pattern(pattern, expr, bindings)? {
                    self.evaluate_guard(guard, bindings)
                } else {
                    Ok(false)
                }
            }

            AdvancedPattern::Range { min, max, inclusive: _ } => {
                match &expr.inner {
                    Expr::Literal(crate::ast::Literal::ExactInteger(n)) => {
                        let n = *n as f64;
                        let min_ok = min.unwrap_or(f64::NEG_INFINITY) <= n;
                        let max_ok = n <= max.unwrap_or(f64::INFINITY);
                        Ok(min_ok && max_ok)
                    }
                    Expr::Literal(crate::ast::Literal::InexactReal(n)) => {
                        let n = *n;
                        let min_ok = min.unwrap_or(f64::NEG_INFINITY) <= n;
                        let max_ok = n <= max.unwrap_or(f64::INFINITY);
                        Ok(min_ok && max_ok)
                    }
                    _ => Ok(false)
                }
            }

            AdvancedPattern::Alternative(patterns) => {
                for pattern in patterns {
                    if self.match_advanced_pattern(pattern, expr, bindings)? {
                        return Ok(true);
                    }
                }
                Ok(false)
            }

            _ => {
                // Other advanced patterns not fully implemented
                Ok(false)
            }
        }
    }

    /// Evaluates a guard expression.
    fn evaluate_guard(&self, guard: &GuardExpression, bindings: &HashMap<String, Value>) -> Result<bool> {
        match guard {
            GuardExpression::Predicate(pred_name) => {
                // Would call predicate function with bindings
                // For now, just return true
                Ok(pred_name == "true")
            }

            GuardExpression::Comparison { operator, left, right } => {
                let left_value = bindings.get(left)
                    .ok_or_else(|| Error::runtime_error(
                        format!("Unbound variable in guard: {left}"),
                        None,
                    ))?;

                let right_value = match right {
                    GuardValue::Literal(val) => val,
                    GuardValue::Variable(var) => bindings.get(var)
                        .ok_or_else(|| Error::runtime_error(
                            format!("Unbound variable in guard: {var}"),
                            None,
                        ))?,
                    GuardValue::Expression(_) => {
                        // Would evaluate expression
                        return Ok(false);
                    }
                };

                self.compare_values(left_value, right_value, operator)
            }

            GuardExpression::And(guards) => {
                for guard in guards {
                    if !self.evaluate_guard(guard, bindings)? {
                        return Ok(false);
                    }
                }
                Ok(true)
            }

            GuardExpression::Or(guards) => {
                for guard in guards {
                    if self.evaluate_guard(guard, bindings)? {
                        return Ok(true);
                    }
                }
                Ok(false)
            }

            GuardExpression::Not(guard) => {
                Ok(!self.evaluate_guard(guard, bindings)?)
            }
        }
    }

    /// Compares two values using an operator.
    fn compare_values(&self, left: &Value, right: &Value, op: &ComparisonOp) -> Result<bool> {
        match (left, right) {
            (Value::Literal(crate::ast::Literal::ExactInteger(a)), 
             Value::Literal(crate::ast::Literal::ExactInteger(b))) => {
                let a = *a as f64;
                let b = *b as f64;
                match op {
                    ComparisonOp::Equal => Ok((a - b).abs() < f64::EPSILON),
                    ComparisonOp::NotEqual => Ok((a - b).abs() >= f64::EPSILON),
                    ComparisonOp::LessThan => Ok(a < b),
                    ComparisonOp::LessEqual => Ok(a <= b),
                    ComparisonOp::GreaterThan => Ok(a > b),
                    ComparisonOp::GreaterEqual => Ok(a >= b),
                }
            }
            (Value::Literal(crate::ast::Literal::InexactReal(a)), 
             Value::Literal(crate::ast::Literal::InexactReal(b))) => {
                match op {
                    ComparisonOp::Equal => Ok((a - b).abs() < f64::EPSILON),
                    ComparisonOp::NotEqual => Ok((a - b).abs() >= f64::EPSILON),
                    ComparisonOp::LessThan => Ok(a < b),
                    ComparisonOp::LessEqual => Ok(a <= b),
                    ComparisonOp::GreaterThan => Ok(a > b),
                    ComparisonOp::GreaterEqual => Ok(a >= b),
                }
            }
            (Value::Literal(crate::ast::Literal::ExactInteger(a)), 
             Value::Literal(crate::ast::Literal::InexactReal(b))) => {
                let a = *a as f64;
                match op {
                    ComparisonOp::Equal => Ok((a - *b).abs() < f64::EPSILON),
                    ComparisonOp::NotEqual => Ok((a - *b).abs() >= f64::EPSILON),
                    ComparisonOp::LessThan => Ok(a < *b),
                    ComparisonOp::LessEqual => Ok(a <= *b),
                    ComparisonOp::GreaterThan => Ok(a > *b),
                    ComparisonOp::GreaterEqual => Ok(a >= *b),
                }
            }
            (Value::Literal(crate::ast::Literal::InexactReal(a)), 
             Value::Literal(crate::ast::Literal::ExactInteger(b))) => {
                let b = *b as f64;
                match op {
                    ComparisonOp::Equal => Ok((*a - b).abs() < f64::EPSILON),
                    ComparisonOp::NotEqual => Ok((*a - b).abs() >= f64::EPSILON),
                    ComparisonOp::LessThan => Ok(*a < b),
                    ComparisonOp::LessEqual => Ok(*a <= b),
                    ComparisonOp::GreaterThan => Ok(*a > b),
                    ComparisonOp::GreaterEqual => Ok(*a >= b),
                }
            }
            _ => {
                match op {
                    ComparisonOp::Equal => Ok(left == right),
                    ComparisonOp::NotEqual => Ok(left != right),
                    _ => Ok(false), // Can't compare non-numbers with ordering
                }
            }
        }
    }

    /// Expands a template with bindings.
    fn expand_template_with_bindings(
        &self,
        template: &AstTemplate,
        _bindings: &HashMap<String, Value>,
        span: Span,
    ) -> Result<Spanned<Expr>> {
        // Simplified template expansion
        match template {
            AstTemplate::Literal(lit) => Ok(Spanned::new(
                Expr::Literal(lit.clone()),
                span,
            )),
            AstTemplate::Identifier(name) => Ok(Spanned::new(
                Expr::Identifier(name.clone()),
                span,
            )),
            _ => Ok(Spanned::new(
                Expr::Literal(crate::ast::Literal::Boolean(true)),
                span,
            )),
        }
    }

    /// Converts an expression to a value (simplified).
    fn expr_to_value(&self, expr: &Spanned<Expr>) -> Result<Value> {
        match &expr.inner {
            Expr::Literal(lit) => Ok(Value::Literal(lit.clone())),
            Expr::Identifier(name) => Ok(Value::symbol(intern_symbol(name))),
            _ => Ok(Value::Literal(crate::ast::Literal::Boolean(true))), // Simplified
        }
    }

    /// Converts a value to an expression.
    fn value_to_expr(&self, value: &Value, span: Span) -> Result<Spanned<Expr>> {
        match value {
            Value::Literal(lit) => Ok(Spanned::new(Expr::Literal(lit.clone()), span)),
            Value::Symbol(sym) => Ok(Spanned::new(
                Expr::Identifier(crate::utils::symbol_name(*sym).unwrap_or_else(|| format!("symbol-{}", sym.0))),
                span,
            )),
            _ => Ok(Spanned::new(
                Expr::Literal(crate::ast::Literal::Boolean(true)),
                span,
            )),
        }
    }

    /// Gets the macro debugger.
    pub fn debugger(&self) -> &MacroDebugger {
        &self.debugger
    }

    /// Gets mutable access to the macro debugger.
    pub fn debugger_mut(&mut self) -> &mut MacroDebugger {
        &mut self.debugger
    }

    /// Gets the enhanced hygiene system.
    pub fn hygiene(&self) -> &EnhancedHygiene {
        &self.hygiene
    }

    /// Gets mutable access to the enhanced hygiene system.
    pub fn hygiene_mut(&mut self) -> &mut EnhancedHygiene {
        &mut self.hygiene
    }

    /// Installs advanced macro primitives.
    pub fn install_primitives(&self, _env: &Rc<Environment>) -> Result<()> {
        // Would install primitives like define-procedural-macro, macro-expand, etc.
        Ok(())
    }
}

/// Hygiene extension system.
#[derive(Debug)]
pub struct HygienicExtension {
    /// Enhanced hygiene system
    hygiene: EnhancedHygiene,
}

impl HygienicExtension {
    /// Creates a new hygienic extension.
    pub fn new() -> Self {
        Self {
            hygiene: EnhancedHygiene::new(),
        }
    }

    /// Applies enhanced hygiene.
    pub fn apply_enhanced_hygiene(
        &mut self,
        expr: Spanned<Expr>,
        macro_name: &str,
        definition_env: &Environment,
    ) -> Result<Spanned<Expr>> {
        self.hygiene.apply_hygiene(expr, macro_name, definition_env)
    }
}

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

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

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

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