use crate::registers::{Register, RCS};
use crate::runtime::Runtime;
use std::io;
use std::thread::sleep;
use std::time::Duration;

pub const T_NOP: u8 = 0x00;
pub const T_EXIT: u8 = 0x01;
pub const T_SET: u8 = 0x02;
pub const T_COPY: u8 = 0x03;
pub const T_LOAD: u8 = 0x04;
pub const T_CLEAR: u8 = 0x05;
pub const T_WRITE: u8 = 0x06;
pub const T_LABEL: u8 = 0x07;
pub const T_GOTO: u8 = 0x08;
pub const T_DEBUG: u8 = 0x09;
pub const T_ADD: u8 = 0x10;
pub const T_SUB: u8 = 0x11;
pub const T_MUL: u8 = 0x12;
pub const T_DIV: u8 = 0x13;
pub const T_MOD: u8 = 0x14;
pub const T_LSH: u8 = 0x15;
pub const T_RSH: u8 = 0x16;
pub const T_JG: u8 = 0x20;
pub const T_JL: u8 = 0x21;
pub const T_JE: u8 = 0x22;
pub const T_PAUSE: u8 = 0xF0;
pub const T_CMD: u8 = 0xF1;
pub const T_SEND: u8 = 0xF2;

pub trait Token {
    fn to_bytecode(&self) -> Vec<u8>;
    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()>;
}

pub trait FromBytecode {
    fn from_bytecode(code: &[&u8]) -> Self;
}

#[derive(Debug, Clone)]
pub struct NopToken;

impl Token for NopToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_NOP]
    }
    fn invoke(&self, _: &mut Runtime) -> io::Result<()> {
        Ok(())
    }
}

impl FromBytecode for NopToken {
    fn from_bytecode(_: &[&u8]) -> Self {
        Self
    }
}

#[derive(Debug, Clone)]
pub struct ExitToken {
    pub register: u8,
}

impl Token for ExitToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_EXIT, self.register]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        let mut exit_code = 0;
        if let Some(rg) = runtime.get_1byte_register(self.register) {
            exit_code = rg.get();
        } else if let Some(rg) = runtime.get_4byte_register(self.register) {
            exit_code = rg.get() as u8;
        } else if self.register == RCS {
            exit_code = runtime.rcs.get() as u8;
        }
        runtime.exit(exit_code);

        Ok(())
    }
}

impl FromBytecode for ExitToken {
    fn from_bytecode(code: &[&u8]) -> Self {
        Self { register: *code[1] }
    }
}

#[derive(Debug, Clone)]
pub struct SetToken {
    pub value: u8,
    pub register: u8,
}

impl Token for SetToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_SET, self.value, self.register]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        if let Some(mut rg) = runtime.get_1byte_register(self.register) {
            rg.set(self.value);
        } else if let Some(mut rg) = runtime.get_4byte_register(self.register) {
            rg.set(self.value as u32);
        } else if self.register == RCS {
            runtime.rcs.set(self.value != 0);
        }

        Ok(())
    }
}

impl FromBytecode for SetToken {
    fn from_bytecode(code: &[&u8]) -> Self {
        Self {
            value: *code[1],
            register: *code[2],
        }
    }
}

#[derive(Debug, Clone)]
pub struct CopyToken {
    pub register_1: u8,
    pub register_2: u8,
}

impl Token for CopyToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_COPY, self.register_1, self.register_2]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        let mut value = 0u32;
        if let Some(rg) = runtime.get_1byte_register(self.register_1) {
            value = rg.get() as u32;
        } else if let Some(rg) = runtime.get_4byte_register(self.register_1) {
            value = rg.get();
        } else if self.register_1 == RCS {
            value = runtime.rcs.get() as u32;
        } else {
            panic!("unknown register {}", self.register_1);
        }

        if let Some(mut rg) = runtime.get_1byte_register(self.register_2) {
            rg.set(value as u8);
        } else if let Some(mut rg) = runtime.get_4byte_register(self.register_2) {
            rg.set(value);
        } else if self.register_2 == RCS {
            runtime.rcs.set(value != 0);
        } else {
            panic!("unknown register {}", self.register_2);
        }

        Ok(())
    }
}

impl FromBytecode for CopyToken {
    fn from_bytecode(code: &[&u8]) -> Self {
        Self {
            register_1: *code[1],
            register_2: *code[2],
        }
    }
}

#[derive(Debug, Clone)]
pub struct LoadToken;

impl Token for LoadToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_LOAD]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        let pointer = runtime.rgp.get();
        if let Some(value) = runtime.memory.get(&pointer) {
            runtime.rgd.set(*value);
        } else {
            runtime.rgd.set(0);
        }

        Ok(())
    }
}

impl FromBytecode for LoadToken {
    fn from_bytecode(_: &[&u8]) -> Self {
        Self
    }
}

#[derive(Debug, Clone)]
pub struct ClearToken {
    pub register: u8,
}

impl Token for ClearToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_CLEAR, self.register]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        if let Some(mut rg) = runtime.get_1byte_register(self.register) {
            rg.set(0u8);
        } else if let Some(mut rg) = runtime.get_4byte_register(self.register) {
            rg.set(0u32);
        } else if self.register == RCS {
            runtime.rcs.set(false);
        }

        Ok(())
    }
}

impl FromBytecode for ClearToken {
    fn from_bytecode(code: &[&u8]) -> Self {
        Self { register: *code[1] }
    }
}

#[derive(Debug, Clone)]
pub struct WriteToken;

impl Token for WriteToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_WRITE]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        runtime.memory.insert(runtime.rgp.get(), runtime.rgd.get());

        Ok(())
    }
}

impl FromBytecode for WriteToken {
    fn from_bytecode(_: &[&u8]) -> Self {
        Self
    }
}

#[derive(Debug, Clone)]
pub struct LabelToken;

impl Token for LabelToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_LABEL]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        runtime.create_label(runtime.rgl.get());

        Ok(())
    }
}

impl FromBytecode for LabelToken {
    fn from_bytecode(_: &[&u8]) -> Self {
        Self
    }
}

#[derive(Debug, Clone)]
pub struct GotoToken;

impl Token for GotoToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_GOTO]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        runtime.jump(runtime.rgl.get())
    }
}

#[derive(Debug, Clone)]
pub struct DebugToken;

impl Token for DebugToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_DEBUG]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        println!("--- Registers --");
        println!("rcs: {}", runtime.rcs.get());
        println!("rcr: {}", runtime.rcr.get());
        println!("rcg: {}", runtime.rcg.get());
        println!("rcb: {}", runtime.rcb.get());
        println!("rgd: {}", runtime.rgd.get());
        println!("rgp: {}", runtime.rgp.get());
        println!("rgi: {}", runtime.rgi.get());
        println!("rgo: {}", runtime.rgo.get());
        println!("rgl: {}", runtime.rgl.get());
        println!("\n--- Runtime ---");
        println!("Memory: {:?}", runtime.memory);
        println!();

        Ok(())
    }
}

impl FromBytecode for GotoToken {
    fn from_bytecode(_: &[&u8]) -> Self {
        Self
    }
}

#[derive(Debug, Clone)]
pub struct AddToken;

impl Token for AddToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_ADD]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        runtime.rgo.set(runtime.rgd.get() + runtime.rgi.get());

        Ok(())
    }
}

impl FromBytecode for AddToken {
    fn from_bytecode(_: &[&u8]) -> Self {
        Self
    }
}

#[derive(Debug, Clone)]
pub struct SubToken;

impl Token for SubToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_SUB]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        runtime.rgo.set(runtime.rgd.get() - runtime.rgi.get());

        Ok(())
    }
}

impl FromBytecode for SubToken {
    fn from_bytecode(_: &[&u8]) -> Self {
        Self
    }
}

#[derive(Debug, Clone)]
pub struct MulToken;

impl Token for MulToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_MUL]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        runtime.rgo.set(runtime.rgd.get() * runtime.rgi.get());

        Ok(())
    }
}

impl FromBytecode for MulToken {
    fn from_bytecode(_: &[&u8]) -> Self {
        Self
    }
}

#[derive(Debug, Clone)]
pub struct DivToken;

impl Token for DivToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_DIV]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        runtime.rgo.set(runtime.rgd.get() / runtime.rgi.get());

        Ok(())
    }
}

impl FromBytecode for DivToken {
    fn from_bytecode(_: &[&u8]) -> Self {
        Self
    }
}

#[derive(Debug, Clone)]
pub struct ModToken;

impl Token for ModToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_MOD]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        runtime.rgo.set(runtime.rgd.get() % runtime.rgi.get());

        Ok(())
    }
}

impl FromBytecode for ModToken {
    fn from_bytecode(_: &[&u8]) -> Self {
        Self
    }
}

#[derive(Debug, Clone)]
pub struct LshToken;

impl Token for LshToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_LSH]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        runtime.rgo.set(runtime.rgd.get() << runtime.rgi.get());

        Ok(())
    }
}

impl FromBytecode for LshToken {
    fn from_bytecode(_: &[&u8]) -> Self {
        Self
    }
}

#[derive(Debug, Clone)]
pub struct RshToken;

impl Token for RshToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_RSH]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        runtime.rgo.set(runtime.rgd.get() >> runtime.rgi.get());

        Ok(())
    }
}

impl FromBytecode for RshToken {
    fn from_bytecode(_: &[&u8]) -> Self {
        Self
    }
}

#[derive(Debug, Clone)]
pub struct JgToken;

impl Token for JgToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_JG]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        if runtime.rgd.get() > runtime.rgi.get() {
            runtime.jump(runtime.rgl.get())?;
        }

        Ok(())
    }
}

impl FromBytecode for JgToken {
    fn from_bytecode(_: &[&u8]) -> Self {
        Self
    }
}

#[derive(Debug, Clone)]
pub struct JlToken;

impl Token for JlToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_JL]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        if runtime.rgd.get() < runtime.rgi.get() {
            runtime.jump(runtime.rgl.get())?;
        }

        Ok(())
    }
}

impl FromBytecode for JlToken {
    fn from_bytecode(_: &[&u8]) -> Self {
        Self
    }
}

#[derive(Debug, Clone)]
pub struct JeToken;

impl Token for JeToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_JE]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        if runtime.rgd.get() == runtime.rgi.get() {
            runtime.jump(runtime.rgl.get())?;
        }

        Ok(())
    }
}

impl FromBytecode for JeToken {
    fn from_bytecode(_: &[&u8]) -> Self {
        Self
    }
}

#[derive(Debug, Clone)]
pub struct PauseToken;

impl Token for PauseToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_PAUSE]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        sleep(Duration::from_millis(runtime.rgd.get() as u64));

        Ok(())
    }
}

impl FromBytecode for PauseToken {
    fn from_bytecode(_: &[&u8]) -> Self {
        Self
    }
}

#[derive(Debug, Clone)]
pub struct CmdToken;

impl Token for CmdToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_CMD]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        unimplemented!();

        Ok(())
    }
}

impl FromBytecode for CmdToken {
    fn from_bytecode(_: &[&u8]) -> Self {
        Self
    }
}

pub struct SendToken;

impl Token for SendToken {
    fn to_bytecode(&self) -> Vec<u8> {
        vec![T_SEND]
    }

    fn invoke(&self, runtime: &mut Runtime) -> io::Result<()> {
        let r = runtime.rcr.get();
        let g = runtime.rcg.get();
        let b = runtime.rcb.get();

        runtime
            .strip_controller
            .borrow_mut()
            .send_rgb_color(r, g, b)
    }
}