use std::time::Duration;
use std::thread::JoinHandle;

use asm::data::literal::{Addr};




use crate::frame::StackFrame;
use crate::program::Program;
use crate::exec::EvalRes;

const CYCLE_TIME : Duration = Duration::from_millis(0);
//const CYCLE_TIME : Duration = Duration::from_millis(100);

#[derive(Clone, Copy, Eq, PartialEq, Debug, Ord, PartialOrd)]
pub struct ThreadToken(pub u32);

pub struct RunThread {
    /// Thread ID
    pub id: ThreadToken,
    /// Active stack frame
    pub frame: StackFrame,
    /// Call stack
    pub call_stack: Vec<StackFrame>,
    /// Program to run
    pub program: Program,
}

impl RunThread {
    pub fn new(id: ThreadToken, program: Program, pc: Addr, args: &[u64]) -> Self {
        let sf = StackFrame::new(pc, args);

        Self {
            id,
            frame: sf,
            call_stack: vec![],
            program,
        }
    }

    pub fn start(self) -> JoinHandle<()> {
        std::thread::spawn(move || {
            self.run();
        })
    }

    fn run(mut self) {
        'run: loop {
            match self.eval_op() {
                Ok(EvalRes {
                       cycles, advance
                   }) => {
                    std::thread::sleep(CYCLE_TIME * (cycles as u32));
                    debug!("Step {}; Status = {}", advance, self.frame.status);
                    self.frame.pc.advance(advance);
                }
                Err(e) => {
                    error!("Fault: {:?}", e);
                    break 'run;
                }
            }
        }
    }
}