use clap::Parser;
use ratatui::{
    Terminal,
    backend::TestBackend,
    crossterm::event::{KeyCode, KeyEvent, KeyEventKind, KeyModifiers},
    layout::Rect,
};
use std::sync::mpsc::{Receiver, channel};
use war_in_tunnels::{
    app::{App, GameStates, View, handle_keybindings, threads::AudioCmd},
    cli::Cli,
};

fn app() -> (App, Receiver<AudioCmd>) {
    let args = Cli::try_parse_from(["game", "--disable-audio"]).unwrap();
    let (tx, rx) = channel();
    let mut app = App::new(args, tx);
    app.window_area = Rect::new(0, 0, 120, 40);
    app.states = Some(GameStates::new(&app.args, &app.window_area));
    (app, rx)
}

fn press(app: &mut App, code: KeyCode) {
    handle_keybindings(app, KeyEvent::new(code, KeyModifiers::NONE));
}

#[test]
fn menu_selection_stays_in_bounds_and_opens_each_view() {
    let (mut app, _) = app();
    for _ in 0..10 {
        press(&mut app, KeyCode::Up);
    }
    assert_eq!(app.states_ref().unwrap().main_menu.selected_view, 1);
    for view in [View::Skirmish, View::PerkDecks, View::SkillsConfig] {
        press(&mut app, KeyCode::Char(' '));
        assert_eq!(app.view, view);
        press(&mut app, KeyCode::Esc);
        assert_eq!(app.view, View::MainMenu);
        press(&mut app, KeyCode::Down);
    }
    for _ in 0..10 {
        press(&mut app, KeyCode::Down);
    }
    assert_eq!(app.states_ref().unwrap().main_menu.selected_view, 3);
}

#[test]
fn quit_keys_work_in_every_view() {
    for view in [
        View::MainMenu,
        View::Skirmish,
        View::PerkDecks,
        View::SkillsConfig,
    ] {
        for key in [
            KeyEvent::new(KeyCode::Char('q'), KeyModifiers::NONE),
            KeyEvent::new(KeyCode::Char('c'), KeyModifiers::CONTROL),
        ] {
            let (mut app, _) = app();
            app.view = view;
            handle_keybindings(&mut app, key);
            assert!(app.exit);
        }
    }
}

#[test]
fn key_release_does_not_trigger_quit() {
    let (mut app, _) = app();
    handle_keybindings(
        &mut app,
        KeyEvent::new_with_kind(
            KeyCode::Char('q'),
            KeyModifiers::NONE,
            KeyEventKind::Release,
        ),
    );
    assert!(!app.exit);
}

#[test]
fn music_keys_send_commands_without_opening_audio_device() {
    let (mut app, rx) = app();
    press(&mut app, KeyCode::Char('m'));
    press(&mut app, KeyCode::Char('b'));
    press(&mut app, KeyCode::Char('n'));
    assert!(matches!(rx.try_recv().unwrap(), AudioCmd::Mute));
    assert!(matches!(rx.try_recv().unwrap(), AudioCmd::VolumeUp));
    assert!(matches!(rx.try_recv().unwrap(), AudioCmd::VolumeDown));
    drop(rx);
    press(&mut app, KeyCode::Char('m'));
    assert!(!app.exit);
}

#[test]
fn skirmish_keys_move_focus_toggle_panel_and_limit_zoom() {
    let (mut app, _) = app();
    app.view = View::Skirmish;
    press(&mut app, KeyCode::Right);
    assert_eq!(
        app.states_ref()
            .unwrap()
            .skirmish
            .board
            .get_focused_cell()
            .get_coords(),
        (5, 4)
    );
    press(&mut app, KeyCode::Tab);
    assert!(app.states_ref().unwrap().skirmish.side_panel);
    press(&mut app, KeyCode::Tab);
    assert!(!app.states_ref().unwrap().skirmish.side_panel);
    for _ in 0..4 {
        press(&mut app, KeyCode::Char(','));
    }
    assert_eq!(
        app.states_ref().unwrap().skirmish.board.zoom_level,
        war_in_tunnels::app::states::skirmish_states::ZoomLevel::ZoomedIn
    );
    for _ in 0..4 {
        press(&mut app, KeyCode::Char('.'));
    }
    assert_eq!(
        app.states_ref().unwrap().skirmish.board.zoom_level,
        war_in_tunnels::app::states::skirmish_states::ZoomLevel::ZoomedOut
    );
}

#[test]
fn all_views_render_without_real_terminal() {
    let (mut app, _) = app();
    let mut terminal = Terminal::new(TestBackend::new(120, 40)).unwrap();
    for view in [
        View::MainMenu,
        View::Skirmish,
        View::PerkDecks,
        View::SkillsConfig,
    ] {
        app.view = view;
        let before = app.states.clone();
        terminal
            .draw(|frame| frame.render_widget(&mut app, frame.area()))
            .unwrap();
        let buffer = terminal.backend().buffer();
        let text: String = buffer.content.iter().map(|cell| cell.symbol()).collect();
        assert!(!text.trim().is_empty(), "{view:?}");
        if matches!(view, View::PerkDecks | View::SkillsConfig) {
            assert!(text.contains("Work in progress"));
        }
        assert_eq!(app.states, before);
    }
}

#[test]
fn common_keys_work_before_states_are_initialized() {
    let (mut app, _) = app();
    app.states = None;
    press(&mut app, KeyCode::Down);
    press(&mut app, KeyCode::Char('q'));
    assert!(app.exit);
}