use bevy::prelude::*;
use crate::{nature, settings, actor, audio, hud};

const MIN_INTERACT_DISTANCE: f32 = 30.0;

pub struct ActorPlugin;
impl Plugin for ActorPlugin {
    fn build(&self, app: &mut App) {
        app.add_systems(FixedUpdate, update);
        app.add_systems(Update, (
            handle_conversations,
            handle_input,
        ));
        app.add_event::<StartConversationEvent>();
    }
}

#[derive(Event)]
pub struct StartConversationEvent {
    pub conv: String
}

#[derive(Component)]
pub struct Actor {
    pub hp: f32,
    pub m: f32, // mass
    pub v: Vec3, // velocity
    // TODO: rotation
}

impl Default for Actor {
    fn default() -> Self {
        Self {
            hp: 100.0,
            m: 100.0,
            v: Vec3::ZERO,
        }
    }
}

#[derive(Component)] pub struct Player;
#[derive(Component)] pub struct PlayerInConversation;
#[derive(Component)] pub struct InConversationWithPlayer;

#[derive(Component)]
pub struct Talker {
    pub conv: String,
}

#[derive(Component)]
pub struct LifeForm {
    pub adrenaline: f32,
    pub adrenaline_baseline: f32,
    pub adrenaline_jolt: f32,
}
impl Default for LifeForm { fn default() -> Self { Self {
    adrenaline: 0.3,
    adrenaline_baseline: 0.3,
    adrenaline_jolt: 0.0,
}}}

#[derive(Component)]
pub struct Suit {
    pub oxygen: f32,
    pub power: f32,
    pub oxygen_max: f32,
    pub power_max: f32,
}
impl Default for Suit { fn default() -> Self { SUIT_SIMPLE } }

const SUIT_SIMPLE: Suit = Suit {
    power: 1e5,
    power_max: 1e5,
    oxygen: nature::OXY_D,
    oxygen_max: nature::OXY_D,
};

pub fn update(
    time: Res<Time>,
    mut query: Query<(&mut LifeForm, &mut Suit)>,
) {
    let d = time.delta_seconds();
    for (mut lifeform, mut suit) in query.iter_mut() {
        if lifeform.adrenaline_jolt.abs() > 1e-3 {
            lifeform.adrenaline_jolt *= 0.99;
        }
        else {
            lifeform.adrenaline_jolt = 0.0
        }
        lifeform.adrenaline = (lifeform.adrenaline - 0.0001 + lifeform.adrenaline_jolt * 0.01).clamp(0.0, 1.0);
        suit.oxygen = (suit.oxygen - nature::OXY_S*d).clamp(0.0, 1.0);
    }
}

pub fn handle_input(
    keyboard_input: Res<ButtonInput<KeyCode>>,
    settings: ResMut<settings::Settings>,
    query: Query<(&Talker, &Transform)>,
    player: Query<&Transform, With<actor::Player>>,
    mut ew_conv: EventWriter<StartConversationEvent>,
    mut ew_click: EventWriter<audio::AudioClickEvent>,
)
{
    if keyboard_input.just_pressed(settings.key_interact) {
        let mindist = MIN_INTERACT_DISTANCE * MIN_INTERACT_DISTANCE;
        if let Ok(player) = player.get_single() {
            for (talker, transform) in &query {
                if transform.translation.distance_squared(player.translation) <= mindist {
                    ew_conv.send(StartConversationEvent{conv: talker.conv.clone()});
                    ew_click.send(audio::AudioClickEvent());
                    break;
                }
            }
        }
    }
}

pub fn handle_conversations(
    mut er_conv: EventReader<StartConversationEvent>,
    mut log: ResMut<hud::Log>,
) {
    for my_event in er_conv.read() {
        log.add(my_event.conv.clone());
        break;
    }
}


//pub enum SuitSystemHandler {
//    Heat,
//    None,
//}
//#[derive(Component)]
//pub struct SuitSystem {
//    pub name: String,
//    pub active: bool,
//    pub power: f32,
//    pub handler: SuitSystemHandler,
//}
//
//impl Default for SuitSystem {
//    fn default() -> Self {
//        Self {
//            name: "Untitled".to_string(),
//            active: true,
//            power: 0.0,
//            handler: SuitSystemHandler::None,
//        }
//    }
//}
//pub fn setup(
//    mut commands: Commands,
//    settings: Res<settings::Settings>,
//) {
//    commands.spawn((
//        Player,
//        SuitSystem {
//            name: "HUD".to_string(),
//            active: settings.hud_active,
//            power: -0.05,
//            ..default()
//        },
//        SuitSystem {
//            name: "Heater".to_string(),
//            handler: SuitSystemHandler::Heat,
//            ..default()
//        }
//    ));
//}