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use std::cell::RefCell;

use failure::Error;

pub mod opcode;

pub struct Program {
    pub funcs: Vec<CodeObject>,
}

#[derive(Debug, Clone)]
pub struct CodeObject {
    pub argcount: u32,       /* #arguments, except *args */
    pub kwonlyargcount: u32, /* #keyword only arguments */
    pub nlocals: u32,        /* #local variables */
    pub stacksize: u32,      /* #entries needed for evaluation stack */
    pub flags: u32,
    pub code: Vec<opcode::Opcode>,    /* instruction opcodes */
    pub consts: RefCell<TupleObject>, /* list (constants used) */
    pub names: Box<RefCell<Object>>,  /* list of strings (names used) */
    pub name: Box<RefCell<Object>>,
    pub varnames: Box<Object>,
}
impl CodeObject {
    pub fn name(&self) -> Result<String, Error> {
        match self.name.clone().into_inner() {
            Object::Ref(_) => failure::bail!("ref should have been removed during decoding"),
            o => o.as_string(),
        }
    }

    pub fn names_tuple(&self) -> Result<TupleObject, Error> {
        match self.names.clone().into_inner() {
            Object::Ref(_) => failure::bail!("ref should have been removed during decoding"),
            Object::Tuple(v) => Ok(v),
            _ => panic!(),
        }
    }

    pub fn varnames_tuple(&self) -> Result<TupleObject, Error> {
        match *self.varnames.clone() {
            Object::Ref(_) => failure::bail!("ref should have been removed during decoding"),
            Object::Tuple(v) => Ok(v),
            _ => panic!(),
        }
    }
}

#[derive(Debug, Clone)]
pub struct TupleObject {
    pub size: u8,
    pub data: Vec<Object>,
}
impl TupleObject {
    pub fn get(&self, i: u8) -> Object {
        self.data[i as usize].clone()
    }
}

#[derive(Debug, Clone)]
pub enum Object {
    None,
    True,
    False,
    Code(CodeObject),
    Ascii(String),
    Int(i32),
    Chars(Vec<u8>),
    Tuple(TupleObject),
    Ref(u32),
}

impl Object {
    pub fn as_string(&self) -> Result<String, Error> {
        match self {
            Object::Ascii(u) => Ok(u.to_string()),
            _ => failure::bail!("could not cast `{:?}` as string", self),
        }
    }

    pub fn is_ref(&self) -> bool {
        match self {
            Object::Ref(_) => true,
            _ => false,
        }
    }
    pub fn is_code(&self) -> bool {
        match self {
            Object::Code(_) => true,
            _ => false,
        }
    }
}

pub fn dump_object(object: Object) {
    match object {
        Object::Code(object) => {
            println!("dump code object");

            for opcode in object.code {
                println!("op {:?} arg {:?}", opcode::to_string(opcode.op), opcode.arg);
            }
            println!("consts {:?}", object.consts);
            println!("names {:?}", object.names);
        }
        _ => unimplemented!(),
    }
}