// #![allow(dead_code)]

mod cpu;
mod error;
mod instructions;
mod keyboard;
mod memory;
mod types;
mod video;

use crate::cpu::Cpu;
use crate::keyboard::Keyboard;
use crate::memory::Mem;
use crate::video::{Screen, TerminalRenderer};

use crossterm::execute;
use crossterm::terminal::{size, Clear, ClearType, SetSize};
// use cpu::CpuController;
use memory::MemHandle;
// use minifb::{Scale, ScaleMode, Window, WindowOptions};
use serde::{Deserialize, Serialize};

use std::env;
use std::io::ErrorKind;
use std::process::exit;
use std::thread::{self, sleep};
use std::time::Duration;
use std::{
    fs::File,
    io::{stdout, Read, Result},
    path::PathBuf,
    str::FromStr,
};

use crossterm::{
    cursor,
    event::{self, KeyCode, KeyEventKind},
    terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
};

#[derive(Serialize, Deserialize, Debug)]
struct Config {
    char_rom: Option<String>,
    rom: String,
}

fn main() -> Result<()> {
    let args: Vec<String> = env::args().collect();

    let mut memory = Mem::new();
    match args.len() {
        0 => {
            println!("george-emu must be run in the terminal, don't know what went wrong here!");
            exit(1)
        }
        1 => {
            let config: Config = match File::open("./george.toml") {
                Ok(mut file) => {
                    let mut string = String::new();
                    file.read_to_string(&mut string).unwrap();
                    toml::from_str(string.as_str()).unwrap()
                }
                Err(_) => {
                    println!("couldn't find a `george.toml` in the current directory!");
                    exit(1);
                }
            };
            let rom = match std::fs::File::open(config.rom) {
                Ok(file) => file,
                Err(error) => panic!("Couldn't open main rom! {:?}", error),
            };
            if let Err(error) = memory.load_rom(rom) {
                println!("{:?}", error);
            };
        }
        2 => match &args[1] as &str {
            "help" => {
                println!("ʕ·ᴥ·ʔ- george-emu is an emulator for george:");
                println!("https://git.augustkline.com/august/george\n");
                println!("commands:");
                println!("  help: print this help screen");
                println!("  help <command>: print help info for any command");
                println!("  rom <path>: load a rom/binary from path\n");
                println!("configuration:");
                println!("  george-emu searches for a `george.toml` in the current directory. in `george.toml` you can specify a path for the character rom using the key `char_rom` and the main rom/binary with the key `rom`");
                exit(0);
            }
            _ => {
                println!(
                    "{:?} isn't a valid command!\n\nuse `{} help` to see all valid commands",
                    &args[1], &args[0]
                );
                exit(1);
            }
        },
        3 => match &args[1] as &str {
            "help" => match &args[2] as &str {
                "rom" => {
                    println!("{:?} rom <path>\nload a rom/binary from path", &args[0]);
                }
                _ => {
                    println!(
                        "{:?} isn't a valid command!\n\nuse `{} help` to see all valid commands",
                        &args[2], &args[0]
                    );
                    exit(1);
                }
            },
            "rom" => {
                let rom = match std::fs::File::open(&args[2]) {
                    Ok(file) => file,
                    Err(error) => {
                        match error.kind() {
                            ErrorKind::NotFound => {
                                println!("couldn't find the rom at {:?}", &args[2]);
                            }
                            ErrorKind::PermissionDenied => {
                                println!(
                                    "didn't have sufficient permissions to open the rom at {:?}",
                                    &args[2]
                                );
                            }
                            _ => {
                                println!("something went wrong! try again in a moment? really not sure why you're getting this error");
                            }
                        }
                        exit(1);
                    }
                };
                if let Err(error) = memory.load_rom(rom) {
                    println!("oh no! this rom couldn't be loaded: {:?}", error);
                    exit(1);
                };
            }
            _ => {
                println!(
                    "{:?} isn't a valid command!\n\nuse `{} help` to see all valid commands",
                    &args[1], &args[0]
                );
                exit(1);
            }
        },
        _ => {
            println!(
                "too many arguments were provided!\n\nuse `{} help` to see all valid commands",
                &args[0]
            );
            exit(1);
        }
    }
    let mut stdout = stdout();
    let (cols, rows) = size()?;
    execute!(stdout, SetSize(64, 29), cursor::Hide, EnterAlternateScreen)?;
    enable_raw_mode()?;

    memory
        .dump(PathBuf::from_str("./coredump.bin").unwrap())
        .unwrap();

    let shared_memory = MemHandle::new(memory);
    let screen_memory = shared_memory.clone();
    let cpu_memory = shared_memory.clone();
    let keyboard_memory = shared_memory.clone();

    // For when we want to leave the terminal again :sigh:
    //
    // thread::spawn(move || {
    //     let mut screen = Crtc::new(
    //         screen_memory,
    //         config.char_rom.as_ref(),
    //         CpuController::new(screen_cpu_tx),
    //         window_tx,
    //     );
    //     screen.run();
    // });

    // let mut window = Window::new(
    //     "ʕ·ᴥ·ʔ-☆",
    //     512,
    //     380,
    //     WindowOptions {
    //         resize: true,
    //         borderless: true,
    //         title: true,
    //         transparency: false,
    //         scale: Scale::X2,
    //         scale_mode: ScaleMode::AspectRatioStretch,
    //         topmost: false,
    //         none: true,
    //     },
    // )
    // .unwrap();

    let keyboard = Keyboard::new(keyboard_memory);

    let (mut cpu, cpu_controller) = Cpu::new_with_control(cpu_memory);
    let _ = cpu.reset();

    thread::spawn(move || loop {
        cpu.cycle();
    });

    let stdout_lock = stdout.lock();
    let renderer = TerminalRenderer::new(screen_memory, stdout_lock);
    let mut screen = Screen::new(renderer, cpu_controller);

    loop {
        sleep(Duration::from_millis(16));
        screen.draw();
        if event::poll(std::time::Duration::from_millis(16))? {
            if let event::Event::Key(key) = event::read()? {
                keyboard.read_keys(key);
                if key.kind == KeyEventKind::Press && key.code == KeyCode::Char('q') {
                    break;
                }
            }
        }
    }

    execute!(
        stdout,
        LeaveAlternateScreen,
        SetSize(cols, rows),
        Clear(ClearType::Purge)
    )?;
    disable_raw_mode()?;
    Ok(())
}