python-ast 1.0.2

use proc_macro2::TokenStream;
use pyo3::{Bound, FromPyObject, PyAny, PyResult, prelude::PyAnyMethods};
use quote::quote;
use serde::{Deserialize, Serialize};

use crate::{
    CodeGen, CodeGenContext, ExprType, Node, PythonOptions, Statement, SymbolTableScopes,
    extract_list,
};

/// Try statement (try/except/else/finally)
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct Try {
    /// The main body of the try block
    pub body: Vec<Statement>,
    /// Exception handlers (except clauses)
    pub handlers: Vec<ExceptHandler>,
    /// Optional else clause body (executed when no exception occurs)
    pub orelse: Vec<Statement>,
    /// Optional finally clause body (always executed)
    pub finalbody: Vec<Statement>,
    /// Position information
    pub lineno: Option<usize>,
    pub col_offset: Option<usize>,
    pub end_lineno: Option<usize>,
    pub end_col_offset: Option<usize>,
}

/// Exception handler (except clause)
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct ExceptHandler {
    /// The exception type to catch (None means catch all)
    pub exception_type: Option<ExprType>,
    /// Variable name to bind the exception to (optional)
    pub name: Option<String>,
    /// Body of the except clause
    pub body: Vec<Statement>,
    /// Position information
    pub lineno: Option<usize>,
    pub col_offset: Option<usize>,
    pub end_lineno: Option<usize>,
    pub end_col_offset: Option<usize>,
}

impl<'a> FromPyObject<'a> for Try {
    fn extract_bound(ob: &Bound<'a, PyAny>) -> PyResult<Self> {
        // Extract body
        let body: Vec<Statement> = extract_list(ob, "body", "try body")?;
        
        // Extract handlers
        let handlers: Vec<ExceptHandler> = extract_list(ob, "handlers", "try handlers")?;
        
        // Extract orelse (optional)
        let orelse: Vec<Statement> = extract_list(ob, "orelse", "try orelse").unwrap_or_default();
        
        // Extract finalbody (optional)
        let finalbody: Vec<Statement> = extract_list(ob, "finalbody", "try finalbody").unwrap_or_default();
        
        Ok(Try {
            body, 
            handlers,
            orelse,
            finalbody,
            lineno: ob.lineno(),
            col_offset: ob.col_offset(),
            end_lineno: ob.end_lineno(),
            end_col_offset: ob.end_col_offset(),
        })
    }
}

impl<'a> FromPyObject<'a> for ExceptHandler {
    fn extract_bound(ob: &Bound<'a, PyAny>) -> PyResult<Self> {
        // Extract exception type (optional)
        let exception_type: Option<ExprType> = if let Ok(type_attr) = ob.getattr("type") {
            if type_attr.is_none() {
                None
            } else {
                Some(type_attr.extract()?)
            }
        } else {
            None
        };
        
        // Extract name (optional)
        let name: Option<String> = if let Ok(name_attr) = ob.getattr("name") {
            if name_attr.is_none() {
                None
            } else {
                Some(name_attr.extract()?)
            }
        } else {
            None
        };
        
        // Extract body
        let body: Vec<Statement> = extract_list(ob, "body", "except handler body")?;
        
        Ok(ExceptHandler {
            exception_type,
            name,
            body,
            lineno: ob.lineno(),
            col_offset: ob.col_offset(),
            end_lineno: ob.end_lineno(),
            end_col_offset: ob.end_col_offset(),
        })
    }
}

impl Node for Try {
    fn lineno(&self) -> Option<usize> { self.lineno }
    fn col_offset(&self) -> Option<usize> { self.col_offset }
    fn end_lineno(&self) -> Option<usize> { self.end_lineno }
    fn end_col_offset(&self) -> Option<usize> { self.end_col_offset }
}

impl Node for ExceptHandler {
    fn lineno(&self) -> Option<usize> { self.lineno }
    fn col_offset(&self) -> Option<usize> { self.col_offset }
    fn end_lineno(&self) -> Option<usize> { self.end_lineno }
    fn end_col_offset(&self) -> Option<usize> { self.end_col_offset }
}

impl CodeGen for Try {
    type Context = CodeGenContext;
    type Options = PythonOptions;
    type SymbolTable = SymbolTableScopes;

    fn find_symbols(self, symbols: Self::SymbolTable) -> Self::SymbolTable {
        // Process body, handlers, orelse, and finalbody
        let symbols = self.body.into_iter().fold(symbols, |acc, stmt| stmt.find_symbols(acc));
        let symbols = self.handlers.into_iter().fold(symbols, |acc, handler| {
            let symbols = handler.body.into_iter().fold(acc, |acc, stmt| stmt.find_symbols(acc));
            if let Some(exception_type) = handler.exception_type {
                exception_type.find_symbols(symbols)
            } else {
                symbols
            }
        });
        let symbols = self.orelse.into_iter().fold(symbols, |acc, stmt| stmt.find_symbols(acc));
        self.finalbody.into_iter().fold(symbols, |acc, stmt| stmt.find_symbols(acc))
    }

    fn to_rust(
        self,
        ctx: Self::Context,
        options: Self::Options,
        symbols: Self::SymbolTable,
    ) -> Result<TokenStream, Box<dyn std::error::Error>> {
        // Generate the try body
        let try_body_tokens: Result<Vec<TokenStream>, Box<dyn std::error::Error>> = self.body.into_iter()
            .map(|stmt| stmt.to_rust(ctx.clone(), options.clone(), symbols.clone()))
            .collect();
        let try_body_tokens = try_body_tokens?;

        // Generate catch blocks for each handler
        let catch_blocks: Result<Vec<TokenStream>, Box<dyn std::error::Error>> = self.handlers.into_iter()
            .map(|handler| {
                let handler_body_tokens: Result<Vec<TokenStream>, Box<dyn std::error::Error>> = handler.body.into_iter()
                    .map(|stmt| stmt.to_rust(ctx.clone(), options.clone(), symbols.clone()))
                    .collect();
                let handler_body_tokens = handler_body_tokens?;

                // For now, generate a generic catch block
                // In a real implementation, you'd want to match specific exception types
                Ok::<TokenStream, Box<dyn std::error::Error>>(quote! {
                    // Exception handler - simplified translation
                    #(#handler_body_tokens)*
                })
            })
            .collect();
        let catch_blocks = catch_blocks?;

        // Generate else clause if present
        let else_tokens = if !self.orelse.is_empty() {
            let else_body_tokens: Result<Vec<TokenStream>, Box<dyn std::error::Error>> = self.orelse.into_iter()
                .map(|stmt| stmt.to_rust(ctx.clone(), options.clone(), symbols.clone()))
                .collect();
            let else_body_tokens = else_body_tokens?;
            quote! {
                // Else clause (executed when no exception occurs)
                #(#else_body_tokens)*
            }
        } else {
            quote!()
        };

        // Generate finally clause if present
        let finally_tokens = if !self.finalbody.is_empty() {
            let finally_body_tokens: Result<Vec<TokenStream>, Box<dyn std::error::Error>> = self.finalbody.into_iter()
                .map(|stmt| stmt.to_rust(ctx.clone(), options.clone(), symbols.clone()))
                .collect();
            let finally_body_tokens = finally_body_tokens?;
            quote! {
                // Finally clause (always executed)
                #(#finally_body_tokens)*
            }
        } else {
            quote!()
        };

        // Generate a simplified try-catch structure
        // Note: This is a basic translation - Rust's error handling is quite different from Python's
        Ok(quote! {
            {
                // Try block - simplified translation to Rust
                // Python's exception handling doesn't map directly to Rust's Result/Option patterns
                #(#try_body_tokens)*
                
                // Catch blocks (simplified)
                #(#catch_blocks)*
                
                // Else clause
                #else_tokens
                
                // Finally clause  
                #finally_tokens
            }
        })
    }
}

#[cfg(test)]
mod tests {
    // Tests would go here - currently commented out as they need full AST infrastructure
    // create_parse_test!(test_simple_try, "try:\n    pass\nexcept:\n    pass", "test.py");
}