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use pyo3::{FromPyObject, PyAny, PyResult};
use crate::codegen::Node;
use proc_macro2::TokenStream;
use quote::{quote};

use crate::tree::{ExprType};
use crate::codegen::{CodeGen, CodeGenError, PythonOptions, CodeGenContext};
use crate::symbols::SymbolTableScopes;

use serde::{Serialize, Deserialize};

#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub enum BinOps {
    Add,
    Sub,
    Mult,
    Div,
    FloorDiv,
    Mod,
    Pow,
    LShift,
    RShift,
    BitOr,
    BitXor,
    BitAnd,
    MatMult,

    Unknown,
}


impl<'a> FromPyObject<'a> for BinOps {
    fn extract(ob: &'a PyAny) -> PyResult<Self> {
        let err_msg = format!("Unimplemented unary op {}", crate::ast_dump(ob, None)?);
        Err(pyo3::exceptions::PyValueError::new_err(
            ob.error_message("<unknown>", err_msg.as_str())
        ))
    }
}

#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct BinOp {
    op: BinOps,
    left: Box<ExprType>,
    right: Box<ExprType>,
}

impl<'a> FromPyObject<'a> for BinOp {
    fn extract(ob: &'a PyAny) -> PyResult<Self> {
        log::debug!("ob: {}", crate::ast_dump(ob, None)?);
        let op = ob.getattr("op").expect(
            ob.error_message("<unknown>", "error getting unary operator").as_str()
        );

        let op_type = op.get_type().name().expect(
            ob.error_message("<unknown>", format!("extracting type name {:?} for binary operator", op).as_str()).as_str()
        );

        let left = ob.getattr("left").expect(
            ob.error_message("<unknown>", "error getting binary operand").as_str()
        );

        let right = ob.getattr("right").expect(
            ob.error_message("<unknown>", "error getting binary operand").as_str()
        );
        log::debug!("left: {}, right: {}", crate::ast_dump(left, None)?, crate::ast_dump(right, None)?);

        let op = match op_type {
            "Add" => BinOps::Add,
            "Sub" => BinOps::Sub,
            "Mult" => BinOps::Mult,
            "Div" => BinOps::Div,
            "FloorDiv" => BinOps::FloorDiv,
            "Mod" => BinOps::Mod,
            "Pow" => BinOps::Pow,
            "LShift" => BinOps::LShift,
            "RShift" => BinOps::RShift,
            "BitOr" => BinOps::BitOr,
            "BitXor" => BinOps::BitXor,
            "BitAnd" => BinOps::BitAnd,
            "MatMult" => BinOps::MatMult,

            _ => {
                log::debug!("Found unknown BinOp {:?}", op);
                BinOps::Unknown
            }
        };

        log::debug!("left: {}, right: {}, op: {:?}/{:?}", crate::ast_dump(left, None)?, crate::ast_dump(right, None)?, op_type, op);

        let right = ExprType::extract(right).expect("getting binary operator operand");
        let left = ExprType::extract(left).expect("getting binary operator operand");


        return Ok(BinOp{
            op: op,
            left: Box::new(left),
            right: Box::new(right),
        });

    }
}

impl<'a> CodeGen for BinOp {
    type Context = CodeGenContext;
    type Options = PythonOptions;
    type SymbolTable = SymbolTableScopes;

    fn to_rust(self, ctx: Self::Context, options: Self::Options, symbols: Self::SymbolTable) -> Result<TokenStream, Box<dyn std::error::Error>> {
        let left = self.left.clone().to_rust(ctx, options.clone(), symbols.clone())?;
        let right = self.right.clone().to_rust(ctx, options.clone(), symbols.clone())?;
        match self.op {
            BinOps::Add => Ok(quote!((#left) + (#right))),
            BinOps::Sub => Ok(quote!((#left) - (#right))),
            BinOps::Mult => Ok(quote!((#left) * (#right))),
            BinOps::Div => Ok(quote!((#left) as f64 / (#right) as f64)),
            BinOps::FloorDiv => Ok(quote!((#left) / (#right))),
            BinOps::Mod => Ok(quote!((#left) % (#right))),
            BinOps::Pow => Ok(quote!((#left).pow(#right))),
            BinOps::LShift => Ok(quote!((#left) << (#right))),
            BinOps::RShift => Ok(quote!((#left) >> (#right))),
            BinOps::BitOr => Ok(quote!((#left) | (#right))),
            BinOps::BitXor => Ok(quote!((#left) ^ (#right))),
            BinOps::BitAnd => Ok(quote!((#left) & (#right))),
            //MatMult, XXX implement this

            _ => {
                let error = CodeGenError(format!("BinOp not implemented {:?}", self), None);
                Err(Box::new(error))
            }
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;


    #[test]
    fn test_add() {
        let options = PythonOptions::default();
        let result = crate::parse("1 + 2", "test_case").unwrap();
        log::info!("Python tree: {:?}", result);
        //info!("{}", result);

        let code = result.to_rust(CodeGenContext::Module, options, SymbolTableScopes::new());
        log::info!("module: {:?}", code);
    }

    #[test]
    fn test_subtract() {
        let options = PythonOptions::default();
        let result = crate::parse("1 - 2", "test_case").unwrap();
        log::info!("Python tree: {:?}", result);
        //info!("{}", result);

        let code = result.to_rust(CodeGenContext::Module, options, SymbolTableScopes::new());
        log::info!("module: {:?}", code);
    }
}