//   ▄████████▄      +        ███ +  ▄█████████ ███     +
//  ███▀    ▀███ +         +  ███    ███▀  +    ███ +       +
//  ███  +   ███ ███   ███ █████████ ███        ███  ███   ███
//  ███     +███ ███   ███    ███    ███▐██████ ███  ███   ███
//  ███ +    ███ ███+  ███   +███    ███     +  ███  ███ + ███
//  ███▄    ▄███ ███▄  ███    ███ +  ███  +     ███  ███▄  ███
//   ▀████████▀ + ▀███████    ███▄   ███▄       ▀████ ▀███████
//       +                  +                +             ███
//  +   ▀████████████████████████████████████████████████████▀
//
// This module manages sound effects and music.

use bevy::prelude::*;
use bevy::audio::{PlaybackMode, Volume};
use crate::prelude::*;
use std::collections::HashMap;

pub struct AudioPlugin;
impl Plugin for AudioPlugin {
    fn build(&self, app: &mut App) {
        app.add_systems(Startup, setup);
        app.add_systems(Update, handle_input.run_if(alive));
        app.add_systems(Update, respawn_sinks.run_if(on_event::<RespawnSinksEvent>()));
        app.add_systems(Update, play_zoom_sfx);
        app.add_systems(Update, pause_all.run_if(on_event::<PauseAllSfxEvent>()));
        app.add_systems(PostUpdate, play_sfx);
        app.add_systems(PostUpdate, update_music);
        app.add_event::<PlaySfxEvent>();
        app.add_event::<PauseAllSfxEvent>();
        app.add_event::<ToggleMusicEvent>();
        app.add_event::<RespawnSinksEvent>();
        app.insert_resource(ZoomTimer(
            Timer::from_seconds(0.09, TimerMode::Repeating)));
    }
}

#[derive(Resource)] pub struct ZoomTimer(Timer);

const PATHS: &[(SfxType, Sfx, &str)] = &[
    (SfxType::BGM, Sfx::BGM, "music/Aleksey Chistilin - Cinematic Cello.ogg"),
    (SfxType::LoopSfx, Sfx::ElectricMotor, "sounds/electricmotor.ogg"),
    (SfxType::LoopSfx, Sfx::Ion, "sounds/ion.ogg"),
    (SfxType::LoopSfx, Sfx::Rocket, "sounds/rocket.ogg"),
    (SfxType::LoopSfx, Sfx::Thruster, "sounds/thruster.ogg"),
    (SfxType::OneOff, Sfx::Click, "sounds/click-button-140881-crop.ogg"),
    (SfxType::OneOff, Sfx::Connect, "sounds/connect.ogg"),
    (SfxType::OneOff, Sfx::Crash, "sounds/crash.ogg"),
    (SfxType::OneOff, Sfx::EnterVehicle, "sounds/bikestart.ogg"),
    (SfxType::OneOff, Sfx::IncomingChatMessage, "sounds/connect.ogg"),
    (SfxType::OneOff, Sfx::Ping, "sounds/connect.ogg"),
    (SfxType::OneOff, Sfx::Switch, "sounds/typosonic-typing-192811-crop.ogg"),
    (SfxType::OneOff, Sfx::WakeUp, "sounds/wakeup.ogg"),
    (SfxType::OneOff, Sfx::Woosh, "sounds/woosh.ogg"),
    (SfxType::OneOff, Sfx::Zoom, "sounds/zoom.ogg"),
];

#[derive(Component, PartialEq, Hash, Eq, Copy, Clone)]
pub enum Sfx {
    BGM,
    Click,
    Connect,
    Crash,
    ElectricMotor,
    EnterVehicle,
    IncomingChatMessage,
    Ion,
    Ping,
    Rocket,
    Switch,
    Thruster,
    WakeUp,
    Woosh,
    Zoom,
}

pub fn str2sfx(sfx_label: &str) -> Sfx {
    return match sfx_label {
        "switch" => Sfx::Switch,
        "click" => Sfx::Click,
        "woosh" => Sfx::Woosh,
        "zoom" => Sfx::Zoom,
        "chat" => Sfx::IncomingChatMessage,
        "ping" => Sfx::Ping,
        "connect" => Sfx::Connect,
        "entervehicle" => Sfx::EnterVehicle,
        "crash" => Sfx::Ping,
        _ => Sfx::Click,
    };
}

pub enum SfxType {
    BGM,
    LoopSfx,
    OneOff,
}

#[derive(Event)] pub struct PlaySfxEvent(pub Sfx);
#[derive(Event)] pub struct PauseAllSfxEvent;
#[derive(Event)] pub struct RespawnSinksEvent;
#[derive(Event)] pub struct ToggleMusicEvent();
#[derive(Resource)] pub struct Sounds(HashMap<Sfx, Handle<AudioSource>>);

pub fn setup(
    mut commands: Commands,
    asset_server: Res<AssetServer>,
    mut ew_respawnsinks: EventWriter<RespawnSinksEvent>,
) {
    let mut map = HashMap::new();
    for (_, sfx, path) in PATHS {
        let source = asset_server.load(*path);
        map.insert(*sfx, source.clone());
    }
    commands.insert_resource(Sounds(map));
    ew_respawnsinks.send(RespawnSinksEvent);
}

pub fn respawn_sinks(
    mut commands: Commands,
    asset_server: Res<AssetServer>,
    settings: Res<var::Settings>,
    q_audiosinks: Query<Entity, (With<AudioSink>, With<Sfx>)>,
) {
    for sink in &q_audiosinks {
        commands.entity(sink).despawn();
    }
    for (sfxtype, sfx, path) in PATHS {
        let source = asset_server.load(*path);
        match sfxtype {
            SfxType::BGM => {
                commands.spawn((
                    *sfx,
                    AudioBundle {
                        source,
                        settings: PlaybackSettings {
                            mode: PlaybackMode::Loop,
                            paused: settings.mute_music,
                            ..default()
                        },
                    },
                ));
            },
            SfxType::LoopSfx => {
                commands.spawn((
                    *sfx,
                    AudioBundle {
                        source,
                        settings: PlaybackSettings {
                            mode: PlaybackMode::Loop,
                            volume: Volume::new(0.0),
                            paused: true,
                            ..default()
                        },
                    },
                ));
            },
            SfxType::OneOff => ()
        }
    }
}

pub fn handle_input(
    keyboard_input: Res<ButtonInput<KeyCode>>,
    mut evwriter_toggle: EventWriter<ToggleMusicEvent>,
    mut evwriter_sfx: EventWriter<PlaySfxEvent>,
    mut settings: ResMut<var::Settings>,
) {
    if keyboard_input.just_pressed(settings.key_toggle_music) {
        settings.mute_music ^= true;
        evwriter_sfx.send(PlaySfxEvent(Sfx::Click));
        evwriter_toggle.send(ToggleMusicEvent());
    }
    if keyboard_input.just_pressed(settings.key_toggle_sfx) {
        settings.mute_sfx ^= true;
        evwriter_sfx.send(PlaySfxEvent(Sfx::Click));
        evwriter_toggle.send(ToggleMusicEvent());
    }
}

pub fn play_sfx(
    mut commands: Commands,
    settings: Res<var::Settings>,
    mut events_sfx: EventReader<PlaySfxEvent>,
    sounds: Res<Sounds>,
) {
    if settings.mute_sfx && !events_sfx.is_empty() {
        events_sfx.clear();
    }
    for sfx in events_sfx.read() {
        if let Some(source) = sounds.0.get(&sfx.0) {
            commands.spawn(AudioBundle {
                source: source.clone(),
                settings: PlaybackSettings::DESPAWN,
            });
        }
    }
}

pub fn update_music(
    mut events: EventReader<ToggleMusicEvent>,
    q_audiosinks: Query<(&AudioSink, &Sfx)>,
    settings: Res<var::Settings>,
) {
    if !events.is_empty() {
        events.clear();
        for (bgm_sink, sfx) in &q_audiosinks {
            if *sfx != Sfx::BGM {
                continue;
            }
            if settings.mute_music {
                bgm_sink.pause();
            }
            else {
                bgm_sink.play();
            }
        }
    }
}

pub fn play_zoom_sfx(
    time: Res<Time>,
    mut timer: ResMut<ZoomTimer>,
    mut last_zoom_level: Local<f64>,
    mapcam: Res<camera::MapCam>,
    mut ew_sfx: EventWriter<PlaySfxEvent>,
    settings: Res<var::Settings>,
) {
    if !timer.0.tick(time.delta()).just_finished() {
        return;
    }
    if settings.map_active && (*last_zoom_level - mapcam.target_zoom_level).abs() > mapcam.target_zoom_level * 0.2 {
        if *last_zoom_level != 0.0 && mapcam.target_zoom_level != camera::INITIAL_ZOOM_LEVEL {
            ew_sfx.send(PlaySfxEvent(Sfx::Zoom));
        }
        *last_zoom_level = mapcam.target_zoom_level;
    }
}

pub fn pause_all(
    q_audiosinks: Query<&AudioSink, With<Sfx>>,
) {
    for sink in &q_audiosinks {
        sink.pause();
    }
}