use bevy::{
    input::mouse::{MouseScrollUnit, MouseWheel},
    prelude::*,
};
use crate::client::components::{MainCamera, Me};
use crate::client::starfield::{parallax_layer_translation, StarfieldSize, BACK_STARFIELD_SIZE, FRONT_STARFIELD_SIZE, MID_STARFIELD_SIZE};
use crate::client::starguide::components::{StarfieldBack, StarfieldFront, StarfieldMid, StarguideCamera};
use crate::shared::ecs::GameplayState;

const STARGUIDE_ZOOM_LEVEL: f32 = 20.0;

fn restore_tiled(sprite: &mut Sprite, size: Option<&StarfieldSize>) {
    if let Some(size) = size {
        sprite.image_mode = SpriteImageMode::Tiled {
            tile_x: true,
            tile_y: true,
            stretch_value: size.0,
        };
    }
}

pub fn zoom_plugin(app: &mut App) {
    app.add_systems(Update, on_scroll);
}

fn on_scroll(
    mut scroll_events: MessageReader<MouseWheel>,
    gameplay_state: Res<State<GameplayState>>,
    mut gameplay_next_state: ResMut<NextState<GameplayState>>,
    window: Single<&Window>,
    starfield_back: Single<
        (&mut Sprite, &mut Transform, &mut Visibility, Option<&StarfieldSize>),
        (
            With<StarfieldBack>,
            Without<StarfieldMid>,
            Without<StarfieldFront>,
        ),
    >,
    starfield_mid: Single<
        (&mut Sprite, &mut Transform, &mut Visibility, Option<&StarfieldSize>),
        (
            With<StarfieldMid>,
            Without<StarfieldBack>,
            Without<StarfieldFront>,
        ),
    >,
    starfield_front: Single<
        (&mut Sprite, &mut Transform, &mut Visibility, Option<&StarfieldSize>),
        (
            With<StarfieldFront>,
            Without<StarfieldBack>,
            Without<StarfieldMid>,
        ),
    >,
    mut starguide_camera: Single<
        (&mut Camera, &mut Projection, &mut Transform),
        (
            With<StarguideCamera>,
            Without<MainCamera>,
            Without<Me>,
            Without<StarfieldFront>,
            Without<StarfieldMid>,
            Without<StarfieldBack>,
        ),
    >,
    mut camera: Single<
        (&mut Camera, &mut Projection),
        (
            With<MainCamera>,
            Without<StarguideCamera>,
            Without<Me>,
            Without<StarfieldFront>,
            Without<StarfieldMid>,
            Without<StarfieldBack>,
        ),
    >,
    player: Single<
        &Transform,
        (
            With<Me>,
            Without<StarfieldFront>,
            Without<StarfieldMid>,
            Without<StarfieldBack>,
            Without<MainCamera>,
        ),
    >,
) {
    let (mut starfield_back, mut starfield_back_pos, mut visibility_back, size_back) =
        starfield_back.into_inner();
    let (mut starfield_mid, mut starfield_mid_pos, mut visibility_mid, size_mid) = starfield_mid.into_inner();
    let (mut starfield_front, mut starfield_front_pos, mut visibility_front, size_front) =
        starfield_front.into_inner();
    let Projection::Orthographic(ref mut camera_projection) = camera.1.clone() else { return };
    let Projection::Orthographic(ref mut starguide_projection) = starguide_camera.1.clone() else { return };
    for event in scroll_events.read() {
        match event.unit {
            MouseScrollUnit::Line | MouseScrollUnit::Pixel => {
                if event.y > 0.0 {
                    camera_projection.scale *= 0.97;
                    starguide_projection.scale *= 0.97;
                } else {
                    camera_projection.scale *= 1.03;
                    starguide_projection.scale *= 1.03;
                }
                if camera_projection.scale > STARGUIDE_ZOOM_LEVEL && matches!(gameplay_state.get(), GameplayState::Main) {
                    camera.0.is_active = false;
                    starguide_camera.0.is_active = true;
                    starguide_camera.2.translation = player.translation;
                    gameplay_next_state.set(GameplayState::Starguide);

                    starfield_back.image_mode = SpriteImageMode::Auto;
                    starfield_mid.image_mode = SpriteImageMode::Auto;
                    starfield_front.image_mode = SpriteImageMode::Auto;
                    *visibility_back = Visibility::Hidden;
                    *visibility_mid = Visibility::Hidden;
                    *visibility_front = Visibility::Hidden;
                } else if camera_projection.scale <= STARGUIDE_ZOOM_LEVEL && matches!(gameplay_state.get(), GameplayState::Starguide) {
                    camera.0.is_active = true;
                    gameplay_next_state.set(GameplayState::Main);
                    starguide_camera.0.is_active = false;
                    if matches!(*visibility_back, Visibility::Hidden) {
                        restore_tiled(&mut starfield_back, size_back);
                        restore_tiled(&mut starfield_mid, size_mid);
                        restore_tiled(&mut starfield_front, size_front);
                    }
                    *visibility_back = Visibility::Inherited;
                    *visibility_mid = Visibility::Inherited;
                    *visibility_front = Visibility::Inherited;
                }
                starfield_back.custom_size =
                    Some(window.size() * camera_projection.scale + Vec2::splat(BACK_STARFIELD_SIZE * 2.0));
                starfield_mid.custom_size =
                    Some(window.size() * camera_projection.scale + Vec2::splat(MID_STARFIELD_SIZE * 2.0));
                starfield_front.custom_size =
                    Some(window.size() * camera_projection.scale + Vec2::splat(FRONT_STARFIELD_SIZE * 2.0));
                let win = window.size();
                starfield_back_pos.translation  = parallax_layer_translation(player.translation, win, camera_projection.scale, 3.0, BACK_STARFIELD_SIZE,  5.0);
                starfield_mid_pos.translation   = parallax_layer_translation(player.translation, win, camera_projection.scale, 2.5, MID_STARFIELD_SIZE,   4.5);
                starfield_front_pos.translation = parallax_layer_translation(player.translation, win, camera_projection.scale, 2.0, FRONT_STARFIELD_SIZE, 4.0);
            }
        }
    }
    *camera.1 = Projection::Orthographic(camera_projection.clone());
    *starguide_camera.1 = Projection::Orthographic(starguide_projection.clone());
}