//   ▄████████▄      +        ███ +  ▄█████████ ███     +
//  ███▀    ▀███ +         +  ███    ███▀  +    ███ +       +
//  ███  +   ███ ███   ███ █████████ ███        ███  ███   ███
//  ███     +███ ███   ███    ███    ███▐██████ ███  ███   ███
//  ███ +    ███ ███+  ███   +███    ███     +  ███  ███ + ███
//  ███▄    ▄███ ███▄  ███    ███ +  ███  +     ███  ███▄  ███
//   ▀████████▀ + ▀███████    ███▄   ███▄       ▀████ ▀███████
//       +                  +                +             ███
//  +   ▀████████████████████████████████████████████████████▀
//
// This module handles player input, and coordinates interplay between other modules

use crate::prelude::*;
use bevy::pbr::ExtendedMaterial;
use bevy::prelude::*;
use bevy::scene::SceneInstance;
use bevy::window::{PrimaryWindow, Window, WindowMode};
use bevy_xpbd_3d::prelude::*;
use std::collections::HashMap;

pub const CHEAT_WARP_1: &str = "pizzeria";
pub const CHEAT_WARP_2: &str = "busstopclippy2";
pub const CHEAT_WARP_3: &str = "busstopclippy3";

pub struct GamePlugin;
impl Plugin for GamePlugin {
    fn build(&self, app: &mut App) {
        app.add_systems(Startup, setup);
        app.add_systems(Update, handle_cheats.run_if(in_control));
        app.add_systems(Update, debug);
        app.add_systems(PostUpdate, handle_game_event);
        app.add_systems(PreUpdate, handle_player_death);
        app.add_systems(
            PostUpdate,
            update_id2pos.in_set(bevy_xpbd_3d::plugins::sync::SyncSet::PositionToTransform),
        );
        app.add_systems(PostUpdate, update_id2v);
        app.add_systems(
            Update,
            handle_achievement_event.run_if(on_event::<AchievementEvent>()),
        );
        app.add_systems(Update, check_achievements);
        app.insert_resource(Id2Pos(HashMap::new()));
        app.insert_resource(Id2V(HashMap::new()));
        app.insert_resource(JupiterPos(DVec3::ZERO));
        app.insert_resource(var::AchievementTracker::default());
        app.insert_resource(var::Settings::default());
        app.insert_resource(var::GameVars::default());
        app.insert_resource(AchievementCheckTimer(Timer::from_seconds(
            1.0,
            TimerMode::Repeating,
        )));
        app.add_event::<PlayerDiesEvent>();
        app.add_event::<GameEvent>();
        app.add_event::<AchievementEvent>();
    }
}

#[derive(Event)]
pub struct PlayerDiesEvent(pub actor::DamageType);
#[derive(Resource)]
pub struct Id2Pos(pub HashMap<String, DVec3>);
#[derive(Resource)]
pub struct Id2V(pub HashMap<String, DVec3>);
#[derive(Resource)]
pub struct JupiterPos(pub DVec3);
#[derive(Resource)]
pub struct AchievementCheckTimer(pub Timer);

#[derive(Event)]
pub enum AchievementEvent {
    RepairSuit,
    TalkTo(String),
    RideVehicle(String),
    DrinkPizza,
    InJupitersShadow,
    FindEarth,
}

#[derive(Event)]
pub enum GameEvent {
    SetAR(Turn),
    SetMusic(Cycle),
    SetSound(Cycle),
    SetMap(Turn),
    SetFullscreen(Turn),
    SetMenu(Turn),
    SetThirdPerson(Turn),
    SetRotationStabilizer(Turn),
    SetShadows(Turn),
    Achievement(String),
}

pub enum Turn {
    On,
    Off,
    Toggle,
}

impl Turn {
    pub fn to_bool(&self, current_state: bool) -> bool {
        match self {
            Turn::On => true,
            Turn::Off => false,
            Turn::Toggle => !current_state,
        }
    }
}

pub enum Cycle {
    First,
    Last,
    Next,
    Previous,
}

impl Cycle {
    pub fn to_index<T>(&self, current_index: usize, vector: &Vec<T>) -> Option<usize> {
        if vector.is_empty() {
            return None;
        }
        match self {
            Cycle::First => Some(0),
            Cycle::Last => Some(vector.len() - 1),
            Cycle::Next => {
                let index = current_index.saturating_add(1);
                if index >= vector.len() {
                    Some(0)
                } else {
                    Some(index)
                }
            }
            Cycle::Previous => {
                if current_index == 0 {
                    Some(vector.len() - 1)
                } else {
                    Some(current_index - 1)
                }
            }
        }
    }
}

pub fn setup(mut settings: ResMut<Settings>, prefs: Res<var::Preferences>) {
    settings.hud_active = prefs.augmented_reality;
    settings.radio_mode = prefs.radio_station;
    settings.set_noise_cancellation_mode(prefs.noise_cancellation_mode);
    settings.third_person = prefs.third_person;
    settings.shadows_sun = prefs.shadows_sun;
}

pub fn handle_game_event(
    mut settings: ResMut<Settings>,
    mut er_game: EventReader<GameEvent>,
    mut ew_sfx: EventWriter<audio::PlaySfxEvent>,
    mut ew_updateoverlays: EventWriter<hud::UpdateOverlayVisibility>,
    mut ew_updatemenu: EventWriter<menu::UpdateMenuEvent>,
    mut ew_togglemusic: EventWriter<audio::ToggleMusicEvent>,
    mut q_window: Query<&mut Window, With<PrimaryWindow>>,
    mut q_light: Query<&mut DirectionalLight>,
    mut mapcam: ResMut<camera::MapCam>,
    mut log: ResMut<hud::Log>,
    opt: Res<var::CommandLineOptions>,
    mut prefs: ResMut<var::Preferences>,
) {
    for event in er_game.read() {
        match event {
            GameEvent::SetAR(turn) => {
                settings.hud_active = turn.to_bool(settings.hud_active);
                ew_togglemusic.send(audio::ToggleMusicEvent());
                ew_updateoverlays.send(hud::UpdateOverlayVisibility);
                prefs.augmented_reality = settings.hud_active;
                prefs.save();
            }
            GameEvent::SetMusic(cycle) => {
                match cycle.to_index(settings.radio_mode, &settings.radio_modes) {
                    Some(mode) => {
                        settings.radio_mode = mode;
                    }
                    None => {}
                }
                ew_togglemusic.send(audio::ToggleMusicEvent());
                prefs.radio_station = settings.radio_mode;
                prefs.save();
            }
            GameEvent::SetSound(cycle) => {
                match cycle.to_index(
                    settings.noise_cancellation_mode,
                    &settings.noise_cancellation_modes,
                ) {
                    Some(mode) => {
                        settings.set_noise_cancellation_mode(mode);
                    }
                    None => {}
                }
                ew_togglemusic.send(audio::ToggleMusicEvent());
                prefs.noise_cancellation_mode = settings.noise_cancellation_mode;
                prefs.save();
            }
            GameEvent::SetMap(turn) => {
                settings.map_active = turn.to_bool(settings.map_active);
                if settings.map_active {
                    ew_sfx.send(audio::PlaySfxEvent(audio::Sfx::Woosh));
                }
                *mapcam = camera::MapCam::default();
                ew_updateoverlays.send(hud::UpdateOverlayVisibility);
            }
            GameEvent::SetFullscreen(turn) => {
                for mut window in &mut q_window {
                    let current_state = window.mode != WindowMode::Windowed;
                    prefs.fullscreen_on = turn.to_bool(current_state);
                    window.mode = match prefs.fullscreen_on {
                        true => opt.window_mode_fullscreen,
                        false => WindowMode::Windowed,
                    };
                    prefs.save();
                }
            }
            GameEvent::SetMenu(turn) => {
                settings.menu_active = turn.to_bool(settings.menu_active);
                ew_updatemenu.send(menu::UpdateMenuEvent);
            }
            GameEvent::SetThirdPerson(turn) => {
                settings.third_person = turn.to_bool(settings.third_person);
                prefs.third_person = settings.third_person;
                prefs.save();
            }
            GameEvent::SetRotationStabilizer(turn) => {
                settings.rotation_stabilizer_active =
                    turn.to_bool(settings.rotation_stabilizer_active);
            }
            GameEvent::SetShadows(turn) => {
                settings.shadows_sun = turn.to_bool(settings.shadows_sun);
                for mut light in &mut q_light {
                    light.shadows_enabled = settings.shadows_sun;
                }
                prefs.shadows_sun = settings.shadows_sun;
                prefs.save();
            }
            GameEvent::Achievement(name) => {
                ew_sfx.send(audio::PlaySfxEvent(audio::Sfx::Achieve));
                log.add(
                    format!("Achievement accomplished: {name}!"),
                    "".to_string(),
                    hud::LogLevel::Achievement,
                );
            }
        }
    }
}

fn handle_player_death(
    mut cmd: Commands,
    mut er_playerdies: EventReader<PlayerDiesEvent>,
    q_scenes: Query<(Entity, &SceneInstance), With<world::DespawnOnPlayerDeath>>,
    q_noscenes: Query<Entity, (With<world::DespawnOnPlayerDeath>, Without<SceneInstance>)>,
    mut scene_spawner: ResMut<SceneSpawner>,
    mut active_asteroids: ResMut<world::ActiveAsteroids>,
    mut ew_effect: EventWriter<visual::SpawnEffectEvent>,
    mut ew_deathscreen: EventWriter<menu::DeathScreenEvent>,
    mut log: ResMut<hud::Log>,
    mut gamevars: ResMut<var::GameVars>,
    mut settings: ResMut<Settings>,
) {
    for death in er_playerdies.read() {
        if settings.god_mode {
            return;
        }
        settings.reset_player_settings();
        gamevars.reset();
        active_asteroids.0.clear();
        for entity in &q_noscenes {
            cmd.entity(entity).despawn();
        }
        for (entity, sceneinstance) in &q_scenes {
            cmd.entity(entity).despawn();
            scene_spawner.despawn_instance(**sceneinstance);
        }
        log.clear();

        match death.0 {
            actor::DamageType::Depressurization => {
                settings.death_cause = "Depressurization".to_string();
                ew_effect.send(visual::SpawnEffectEvent {
                    class: visual::Effects::FadeIn(Color::BLACK),
                    duration: 4.0,
                });
            }
            actor::DamageType::Mental => {
                settings.death_cause = "Brain Damage".to_string();
                ew_effect.send(visual::SpawnEffectEvent {
                    class: visual::Effects::FadeIn(Color::BLACK),
                    duration: 4.0,
                });
            }
            actor::DamageType::Asphyxiation => {
                settings.death_cause = "Suffocation".to_string();
                ew_effect.send(visual::SpawnEffectEvent {
                    class: visual::Effects::FadeIn(Color::BLACK),
                    duration: 1.0,
                });
            }
            actor::DamageType::Trauma => {
                settings.death_cause = "Trauma".to_string();
                ew_effect.send(visual::SpawnEffectEvent {
                    class: visual::Effects::FadeIn(Color::MAROON),
                    duration: 1.0,
                });
            }
            actor::DamageType::GForce => {
                settings.death_cause = "Trauma from excessive g forces".to_string();
                ew_effect.send(visual::SpawnEffectEvent {
                    class: visual::Effects::FadeIn(Color::MAROON),
                    duration: 1.0,
                });
            }
            _ => {
                settings.death_cause = "Unknown".to_string();
                ew_effect.send(visual::SpawnEffectEvent {
                    class: visual::Effects::FadeIn(Color::MAROON),
                    duration: 1.0,
                });
            }
        }

        ew_deathscreen.send(menu::DeathScreenEvent::Show);
        return;
    }
}

fn handle_cheats(
    key_input: Res<ButtonInput<KeyCode>>,
    mut q_player: Query<
        (&Transform, &mut Position, &mut LinearVelocity),
        With<actor::PlayerCamera>,
    >,
    mut q_life: Query<(&mut actor::LifeForm, &mut actor::ExperiencesGForce), With<actor::Player>>,
    q_target: Query<
        (&Transform, &Position, Option<&LinearVelocity>),
        (With<hud::IsTargeted>, Without<actor::PlayerCamera>),
    >,
    mut ew_playerdies: EventWriter<PlayerDiesEvent>,
    mut settings: ResMut<Settings>,
    jupiter_pos: Res<JupiterPos>,
    id2pos: Res<Id2Pos>,
    id2v: Res<Id2V>,
    mut ew_sfx: EventWriter<audio::PlaySfxEvent>,
) {
    if q_player.is_empty() || q_life.is_empty() {
        return;
    }
    let (trans, mut pos, mut v) = q_player.get_single_mut().unwrap();
    let (mut lifeform, mut gforce) = q_life.get_single_mut().unwrap();
    let boost = if key_input.pressed(KeyCode::ShiftLeft) {
        1e6
    } else {
        1e3
    };
    if key_input.just_pressed(settings.key_cheat_god_mode) {
        settings.god_mode ^= true;
        if settings.god_mode {
            ew_sfx.send(audio::PlaySfxEvent(audio::Sfx::EnterVehicle));
        }
    }
    if !settings.god_mode && !settings.dev_mode {
        return;
    }

    if key_input.just_pressed(settings.key_cheat_stop) {
        gforce.ignore_gforce_seconds = 1.0;
        v.0 = nature::orbital_velocity(pos.0 - jupiter_pos.0, nature::JUPITER_MASS);
    }
    if key_input.pressed(settings.key_cheat_speed)
        || key_input.pressed(settings.key_cheat_speed_backward)
    {
        gforce.ignore_gforce_seconds = 1.0;
        let sign = if key_input.pressed(settings.key_cheat_speed) {
            1.0
        } else {
            -1.0
        };
        let dv = DVec3::from(trans.rotation * Vec3::new(0.0, 0.0, sign * boost));
        let current_speed = v.0.length();
        let next_speed = (v.0 + dv).length();
        let avg_speed = (current_speed + next_speed) / 2.0;
        let inv_lorentz = nature::inverse_lorentz_factor(avg_speed.clamp(0.0, nature::C));
        v.0 = v.0 + inv_lorentz * dv;
    }
    if key_input.just_pressed(settings.key_cheat_teleport) {
        if let Ok((transform, target_pos, target_v)) = q_target.get_single() {
            let offset: DVec3 =
                4.0 * (**pos - **target_pos).normalize() * transform.scale.as_dvec3();
            pos.0 = **target_pos + offset;
            if let Some(target_v) = target_v {
                *v = target_v.clone();
            }
        }
    }

    if !settings.dev_mode {
        return;
    }

    if key_input.just_pressed(settings.key_cheat_pizza) {
        if let Some(target) = id2pos.0.get(&CHEAT_WARP_1.to_string()) {
            pos.0 = *target + DVec3::new(-60.0, 0.0, 0.0);
            gforce.ignore_gforce_seconds = 1.0;
        }
        if let Some(target) = id2v.0.get(&CHEAT_WARP_1.to_string()) {
            v.0 = *target;
        }
    }
    if key_input.just_pressed(settings.key_cheat_farview1) {
        if let Some(target) = id2pos.0.get(&CHEAT_WARP_2.to_string()) {
            pos.0 = *target + DVec3::new(0.0, -1000.0, 0.0);
            gforce.ignore_gforce_seconds = 1.0;
        }
        if let Some(target) = id2v.0.get(&CHEAT_WARP_2.to_string()) {
            v.0 = *target;
        }
    }
    if key_input.just_pressed(settings.key_cheat_farview2) {
        if let Some(target) = id2pos.0.get(&CHEAT_WARP_3.to_string()) {
            pos.0 = *target + DVec3::new(0.0, -1000.0, 0.0);
            gforce.ignore_gforce_seconds = 1.0;
        }
        if let Some(target) = id2v.0.get(&CHEAT_WARP_3.to_string()) {
            v.0 = *target;
        }
    }
    if key_input.pressed(settings.key_cheat_adrenaline_zero) {
        lifeform.adrenaline = 0.0;
    }
    if key_input.pressed(settings.key_cheat_adrenaline_mid) {
        lifeform.adrenaline = 0.5;
    }
    if key_input.pressed(settings.key_cheat_adrenaline_max) {
        lifeform.adrenaline = 1.0;
    }
    if key_input.just_pressed(settings.key_cheat_die) {
        settings.god_mode = false;
        ew_playerdies.send(PlayerDiesEvent(actor::DamageType::Trauma));
    }
}

fn update_id2pos(
    mut id2pos: ResMut<Id2Pos>,
    mut jupiterpos: ResMut<JupiterPos>,
    q_id: Query<(&Position, &actor::Identifier)>,
) {
    id2pos.0.clear();
    for (pos, id) in &q_id {
        id2pos.0.insert(id.0.clone(), pos.0);
        if id.0 == "jupiter" {
            jupiterpos.0 = pos.0;
        }
    }
}

fn update_id2v(mut id2v: ResMut<Id2V>, q_id: Query<(&LinearVelocity, &actor::Identifier)>) {
    id2v.0.clear();
    for (v, id) in &q_id {
        id2v.0.insert(id.0.clone(), v.0);
    }
}

fn debug(
    settings: Res<var::Settings>,
    keyboard_input: Res<ButtonInput<KeyCode>>,
    mut commands: Commands,
    mut extended_materials: ResMut<
        Assets<ExtendedMaterial<StandardMaterial, load::AsteroidSurface>>,
    >,
    mut achievement_tracker: ResMut<var::AchievementTracker>,
    vars: Res<var::GameVars>,
    materials: Query<(Entity, Option<&Name>, &Handle<Mesh>)>,
) {
    if settings.dev_mode && keyboard_input.just_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(load::AsteroidSurface::material());
            entity.insert(material);
        }
    }
    if settings.dev_mode && keyboard_input.just_pressed(KeyCode::KeyN) {
        achievement_tracker.achieve_all();
        dbg!(&vars);
    }
}

fn handle_achievement_event(
    mut er_achievement: EventReader<AchievementEvent>,
    mut ew_game: EventWriter<GameEvent>,
    mut tracker: ResMut<var::AchievementTracker>,
) {
    for event in er_achievement.read() {
        match event {
            AchievementEvent::RepairSuit => {
                if !tracker.repair_suit {
                    ew_game.send(GameEvent::Achievement("Repair Your Suit".into()));
                }
                tracker.repair_suit = true;
            }
            AchievementEvent::InJupitersShadow => {
                if !tracker.in_jupiters_shadow {
                    ew_game.send(GameEvent::Achievement(
                        "Eclipse the sun with Jupiter".into(),
                    ));
                }
                tracker.in_jupiters_shadow = true;
            }
            AchievementEvent::DrinkPizza => {
                if !tracker.drink_a_pizza {
                    ew_game.send(GameEvent::Achievement("Enjoy A Pizza".into()));
                }
                tracker.drink_a_pizza = true;
            }
            AchievementEvent::FindEarth => {
                if !tracker.find_earth {
                    ew_game.send(GameEvent::Achievement("Find Earth".into()));
                }
                tracker.find_earth = true;
            }
            AchievementEvent::RideVehicle(name) => {
                tracker.vehicles_ridden.insert(name.clone());
                let len = tracker.vehicles_ridden.len();
                let total = tracker.all_vehicles.len();
                if !tracker.ride_every_vehicle && len == total {
                    tracker.ride_every_vehicle = true;
                    ew_game.send(GameEvent::Achievement("Ride Every Vehicle".into()));
                }
            }
            AchievementEvent::TalkTo(name) => {
                tracker.people_talked_to.insert(name.clone());
                let len = tracker.people_talked_to.len();
                let total = tracker.all_people.len();
                if !tracker.talk_to_everyone && len == total {
                    tracker.talk_to_everyone = true;
                    ew_game.send(GameEvent::Achievement("Talk To Everyone".into()));
                }
            }
        }
    }
}

fn check_achievements(
    time: Res<Time>,
    q_player: Query<&Position, With<actor::PlayerCamera>>,
    id2pos: Res<Id2Pos>,
    mut ew_achievement: EventWriter<AchievementEvent>,
    mut timer: ResMut<AchievementCheckTimer>,
) {
    if !timer.0.tick(time.delta()).just_finished() {
        return;
    }
    let pos_player = if let Ok(pos) = q_player.get_single() {
        pos
    } else {
        return;
    };
    let pos_sun = if let Some(pos) = id2pos.0.get("sol") {
        pos
    } else {
        return;
    };
    let pos_jupiter = if let Some(pos) = id2pos.0.get("jupiter") {
        pos
    } else {
        return;
    };

    let shadowed = in_shadow(
        *pos_sun,
        nature::SOL_RADIUS,
        *pos_jupiter,
        nature::JUPITER_RADIUS,
        **pos_player,
    );

    if shadowed {
        ew_achievement.send(AchievementEvent::InJupitersShadow);
    }
}