use std::{fs::OpenOptions, io::Write, os::unix::fs::OpenOptionsExt, process::Command};

use crate::{
    arch::x86_64::*,
    backend::{Instr as BInstr, Program},
};

pub fn test_x86_64() {
    let mut program = Program::<X86_64>::default();
    let text = b"Hello world!\n";
    let text_sym = program.ro_data(text);
    let entry = program.func([BInstr::Asm(Asm {
        instrs: vec![
            mov(ax, 1),
            mov(di, 1),
            lea(rsi, text_sym),
            mov(dx, text.len() as u64),
            Instr::Syscall,
            mov(ax, 0x3c),
            mov(di, 39),
            Instr::Syscall,
        ],
    })]);
    program.entry = Some(entry);
    let linked = program.compile().expect("failed to compile");
    let binary = linked.to_elf();
    let path = "./x86_64_test";
    let mut file = OpenOptions::new()
        .create(true)
        .write(true)
        .truncate(true)
        .mode(0o750)
        .open(path)
        .expect("Failed to create file");
    file.write_all(&binary).expect("Failed to write to file");
    file.sync_all().expect("Failed to sync file");
    drop(file);
    println!("running...");
    let gdb = false;
    let mut proc = if gdb {
        let mut cmd = Command::new("gdb");
        #[rustfmt::skip]
        cmd.args([
            "-q",
            "-ex", "starti",
            "-ex", "layout asm",
            "-ex", "focus next",
            "x86_64_test",
        ]);
        cmd
    } else {
        Command::new(path)
    }
    .spawn()
    .expect("failed to run");
    let status = proc.wait().expect("failed to wait");
    if let Some(code) = status.code() {
        std::process::exit(code);
    }
}