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//
// This module initializes the game, handles command-line arguments,
// and manages window-related key bindings.

pub mod actor;
pub mod audio;
pub mod camera;
pub mod chat;
pub mod cmd;
pub mod common;
pub mod game;
pub mod hud;
pub mod load;
pub mod menu;
#[allow(dead_code)]
pub mod nature;
pub mod var;
pub mod visual;
pub mod world;

pub mod prelude {
    pub use crate::common::*;
    pub use crate::load::load_asset;
    pub use crate::var::{Preferences, Settings};
    pub use crate::{
        actor, audio, camera, chat, cmd, common, game, hud, load, menu, nature, var, visual, world,
    };
    pub use game::Cycle::Next;
    pub use game::Turn::Toggle;
    pub use game::{GameEvent, Turn};
}

use bevy::diagnostic::FrameTimeDiagnosticsPlugin;
use bevy::prelude::*;
use bevy::window::{CursorGrabMode, PrimaryWindow, Window, WindowMode};
use std::env;

const HELP: &str = "./outfly [options]

Options:
  --version, -v  show this program's version number and exit
  --help, -h     show this help message and exit
  --gl           use GL rendering instead of Vulkan
  --fs-legacy    use 'legacy' (non-borderless) fullscreen mode
  --fs-sized     use 'sized' (non-borderless) fullscreen mode
  --windowed     start in non-fullscreen mode

Note: borderless fullscreen is the default, but it crashes on some systems.";

fn main() {
    let prefs = var::load_prefs();
    let mut opt = var::CommandLineOptions {
        window_mode_fullscreen: prefs.get_fullscreen_mode(),
        window_mode_initial: prefs.get_window_mode(),
        use_gl: prefs.render_mode_is_gl(),
    };

    let args: Vec<String> = env::args().collect();
    if args.len() > 1 {
        for arg in &args[1..] {
            if arg == "--help" || arg == "-h" {
                println!("{}", HELP);
                return;
            } else if arg == "--version" || arg == "-v" {
                let version = option_env!("CARGO_PKG_VERSION").unwrap();
                let name = option_env!("CARGO_PKG_NAME").unwrap();
                let homepage = option_env!("CARGO_PKG_HOMEPAGE").unwrap();
                println!("{name} {version}");
                println!("License: GNU GPL version 3: https://gnu.org/licenses/gpl.html");
                println!("{homepage}");
                return;
            } else if arg == "--gl" {
                opt.use_gl = true;
            } else if arg == "--windowed" {
                opt.window_mode_initial = WindowMode::Windowed;
            } else if arg == "--fs-legacy" {
                let mode = WindowMode::Fullscreen;
                if opt.window_mode_initial == opt.window_mode_fullscreen {
                    opt.window_mode_initial = mode;
                }
                opt.window_mode_fullscreen = mode;
            } else if arg == "--fs-sized" {
                let mode = WindowMode::SizedFullscreen;
                if opt.window_mode_initial == opt.window_mode_fullscreen {
                    opt.window_mode_initial = mode;
                }
                opt.window_mode_fullscreen = mode;
            } else {
                println!("{}", HELP);
                println!("\nERROR: no such option: `{}`", arg);
                return;
            }
        }
    }
    if opt.use_gl {
        env::set_var("WGPU_BACKEND", "gl");
    }

    dbg!(&prefs);

    let mut app = App::new();
    app.insert_resource(opt);

    #[cfg(feature = "embed_assets")]
    app.add_plugins(bevy_embedded_assets::EmbeddedAssetPlugin {
        mode: bevy_embedded_assets::PluginMode::ReplaceDefault,
    });

    // Reduce power usage when unfocused
    app.insert_resource(bevy::winit::WinitSettings {
        focused_mode: bevy::winit::UpdateMode::Continuous,
        unfocused_mode: bevy::winit::UpdateMode::reactive_low_power(
            bevy::utils::Duration::from_secs(10),
        ),
    });

    app.add_plugins(OutFlyPlugin);
    app.insert_resource(prefs);
    app.run();
}

pub struct OutFlyPlugin;
impl Plugin for OutFlyPlugin {
    fn build(&self, app: &mut App) {
        app.add_systems(Startup, setup);
        app.add_systems(Update, handle_input);
        app.add_plugins((
            DefaultPlugins, //.set(ImagePlugin::default_nearest()),
            FrameTimeDiagnosticsPlugin,
            actor::ActorPlugin,
            audio::AudioPlugin,
            camera::CameraPlugin,
            chat::ChatPlugin,
            cmd::CmdPlugin,
            game::GamePlugin,
            menu::MenuPlugin,
            visual::VisualPlugin,
            hud::HudPlugin,
            load::LoadPlugin,
            world::WorldPlugin,
        ));
    }
}

fn setup(mut windows: Query<&mut Window, With<PrimaryWindow>>, opt: Res<var::CommandLineOptions>) {
    for mut window in &mut windows {
        window.cursor.grab_mode = CursorGrabMode::Locked;
        window.cursor.visible = false;
        window.mode = opt.window_mode_initial;
        window.title = common::GAME_NAME.to_string();
    }
}

fn handle_input(
    keyboard_input: Res<ButtonInput<KeyCode>>,
    settings: Res<var::Settings>,
    mut ew_sfx: EventWriter<audio::PlaySfxEvent>,
    mut ew_game: EventWriter<game::GameEvent>,
) {
    if keyboard_input.just_pressed(settings.key_fullscreen) {
        ew_sfx.send(audio::PlaySfxEvent(audio::Sfx::Click));
        ew_game.send(game::GameEvent::SetFullscreen(game::Turn::Toggle));
    }
}