use bevy::{
    input::mouse::{MouseScrollUnit, MouseWheel},
    prelude::*,
};

use crate::{
    client::starfield::{BACK_STARFIELD_SIZE, FRONT_STARFIELD_SIZE, MID_STARFIELD_SIZE, StarfieldSize}, ecs::{MainCamera, Me, StarfieldBack, StarfieldFront, StarfieldMid}
};
use crate::ecs::{StarguideCamera, GameplayState};

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 Transform),
        (
            With<StarguideCamera>,
            Without<MainCamera>,
            Without<Me>,
            Without<StarfieldFront>,
            Without<StarfieldMid>,
            Without<StarfieldBack>,
        ),
    >,
    mut camera: Single<
        (&mut Camera, &mut Transform),
        (
            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();
    for event in scroll_events.read() {
        match event.unit {
            MouseScrollUnit::Line | MouseScrollUnit::Pixel => {
                if event.y > 0.0 {
                    camera.1.scale *= 0.97;
                    starguide_camera.1.scale *= 0.97;
                } else {
                    camera.1.scale *= 1.03;
                    starguide_camera.1.scale *= 1.03;
                }
                if camera.1.scale.z > 20.0 && matches!(gameplay_state.get(), GameplayState::Main) {
                    camera.0.is_active = false;
                    starguide_camera.0.is_active = true;

                    starguide_camera.1.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.1.scale.z <= 20.0 && 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) {
                        if let Some(size_back) = size_back {
                            starfield_back.image_mode = SpriteImageMode::Tiled {
                                tile_x: true,
                                tile_y: true,
                                stretch_value: size_back.0,
                            };
                        }
                        if let Some(size_mid) = size_mid {
                            starfield_mid.image_mode = SpriteImageMode::Tiled {
                                tile_x: true,
                                tile_y: true,
                                stretch_value: size_mid.0,
                            };
                        }
                        if let Some(size_front) = size_front{
                            starfield_front.image_mode = SpriteImageMode::Tiled {
                                tile_x: true,
                                tile_y: true,
                                stretch_value: size_front.0,
                            };
                        }
                    }
                    *visibility_back = Visibility::Inherited;
                    *visibility_mid = Visibility::Inherited;
                    *visibility_front = Visibility::Inherited;
                }
                starfield_back.custom_size =
                    Some(window.size() * camera.1.scale.z + Vec2::splat(BACK_STARFIELD_SIZE * 2.0));
                starfield_mid.custom_size =
                    Some(window.size() * camera.1.scale.z + Vec2::splat(MID_STARFIELD_SIZE * 2.0));
                starfield_front.custom_size =
                    Some(window.size() * camera.1.scale.z + Vec2::splat(FRONT_STARFIELD_SIZE * 2.0));
                starfield_back_pos.translation = player.translation
                    + (-player.translation / 3.0) % BACK_STARFIELD_SIZE
                    + (Vec3::new(window.resolution.width(), -window.resolution.height(), 0.0)
                        * camera.1.scale.z
                        / 2.0)
                        % BACK_STARFIELD_SIZE
                    + Vec3::new(0.0, BACK_STARFIELD_SIZE, 0.0)
                    - Vec3::new(0.0, 0.0, 5.0);
                starfield_mid_pos.translation = player.translation
                    + (-player.translation / 2.5) % MID_STARFIELD_SIZE
                    + (Vec3::new(window.resolution.width(), -window.resolution.height(), 0.0)
                        * camera.1.scale.z
                        / 2.0)
                        % MID_STARFIELD_SIZE
                    + Vec3::new(0.0, MID_STARFIELD_SIZE, 0.0)
                    - Vec3::new(0.0, 0.0, 4.5);
                starfield_front_pos.translation = player.translation
                    + (-player.translation / 2.0) % FRONT_STARFIELD_SIZE
                    + (Vec3::new(window.resolution.width(), -window.resolution.height(), 0.0)
                        * camera.1.scale.z
                        / 2.0)
                        % FRONT_STARFIELD_SIZE
                    + Vec3::new(0.0, FRONT_STARFIELD_SIZE, 0.0)
                    - Vec3::new(0.0, 0.0, 4.0);
            }
        }
    }
}