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

mod actor;
mod audio;
mod camera;
mod chat;
mod commands;
mod effects;
mod hud;
mod shading;
mod skeleton;
mod var;
mod world;

#[allow(dead_code)]
mod nature;

use bevy::window::{Window, WindowMode, PrimaryWindow, CursorGrabMode};
use bevy::diagnostic::FrameTimeDiagnosticsPlugin;
use bevy::prelude::*;
use bevy::pbr::ExtendedMaterial;
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 = 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");
    }

    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
    });

    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_systems(Update, debug);
        app.insert_resource(var::Settings::default());
        app.insert_resource(var::GameVars::default());
        app.add_plugins((
            DefaultPlugins,//.set(ImagePlugin::default_nearest()),
            FrameTimeDiagnosticsPlugin,

            actor::ActorPlugin,
            audio::AudioPlugin,
            camera::CameraPlugin,
            chat::ChatPlugin,
            commands::CommandsPlugin,
            effects::EffectsPlugin,
            hud::HudPlugin,
            shading::ShadingPlugin,
            skeleton::SkeletonPlugin,
            world::WorldPlugin,
        ));
    }
}

#[derive(Resource, Default)]
pub struct CommandLineOptions {
    window_mode_fullscreen: WindowMode,
    window_mode_initial: WindowMode,
    use_gl: bool,
}

fn setup(
    mut windows: Query<&mut Window, With<PrimaryWindow>>,
    opt: Res<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 = "OutFly".to_string();
    }
}

fn handle_input(
    keyboard_input: Res<ButtonInput<KeyCode>>,
    settings: Res<var::Settings>,
    opt: Res<CommandLineOptions>,
    mut app_exit_events: ResMut<Events<bevy::app::AppExit>>,
    mut windows: Query<&mut Window, With<PrimaryWindow>>,
    mut ew_sfx: EventWriter<audio::PlaySfxEvent>,
) {
    if keyboard_input.pressed(settings.key_exit) {
        app_exit_events.send(bevy::app::AppExit);
    }
    if keyboard_input.just_pressed(settings.key_fullscreen) {
        ew_sfx.send(audio::PlaySfxEvent(audio::Sfx::Click));
        for mut window in &mut windows {
            window.mode = if window.mode == WindowMode::Windowed {
                opt.window_mode_fullscreen
            } else {
                WindowMode::Windowed
            }
        }
    }
}

fn debug(
    settings: Res<var::Settings>,
    keyboard_input: Res<ButtonInput<KeyCode>>,
    mut commands: Commands,
    mut extended_materials: ResMut<Assets<ExtendedMaterial<StandardMaterial, shading::AsteroidSurface>>>,
    materials: Query<(Entity, Option<&Name>, &Handle<Mesh>)>,
) {
    if settings.dev_mode && keyboard_input.pressed(KeyCode::KeyP) {
        for (entity, _name, mesh) in &materials {
            dbg!(mesh);
            let mut entity = commands.entity(entity);
            entity.remove::<Handle<StandardMaterial>>();
            let material = extended_materials.add(shading::AsteroidSurface::material());
            entity.insert(material);
        }
    }
}