use crate::attachment::{JointOf, Peer, SnapOf};
use crate::ecs::{Part, ThrustEvent};
use bevy::color::palettes::css::{FUCHSIA, GREEN, ORANGE, WHITE};
use bevy::dev_tools::picking_debug::DebugPickingMode;
use bevy::math::{Vec3, Vec3Swizzles};
use bevy::prelude::{Gizmos, GlobalTransform, Query, ResMut, Resource, Transform, With};
use bevy::{
    app::{App, Update},
    ecs::{event::EventWriter, system::Res},
    input::{ButtonInput, keyboard::KeyCode},
};
use bevy_rapier2d::render::DebugRenderContext;
use std::ops::Deref;

pub fn key_input_plugin(app: &mut App) {
    app.add_systems(Update, directional_keys)
        .add_systems(Update, debug_render_keybind)
        .init_resource::<AttachmentDebugRes>()
        .add_systems(Update, draw_attachment_debug);
}

#[derive(Resource, Default)]
pub struct AttachmentDebugRes(pub bool);
impl Deref for AttachmentDebugRes {
    type Target = bool;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

fn debug_render_keybind(
    keys: Res<ButtonInput<KeyCode>>,
    mut debug_render: ResMut<DebugRenderContext>,
    mut picking_debug_mode: ResMut<DebugPickingMode>,
    mut attachment_debug: ResMut<AttachmentDebugRes>,
) {
    if keys.just_pressed(KeyCode::F3) {
        debug_render.enabled = !debug_render.enabled;
    }
    if keys.just_pressed(KeyCode::F4) {
        *picking_debug_mode = DebugPickingMode::Noisy;
    }
    if keys.just_pressed(KeyCode::F5) {
        attachment_debug.0 = !attachment_debug.0;
    }
}

fn directional_keys(keys: Res<ButtonInput<KeyCode>>, mut thrust_event: EventWriter<ThrustEvent>) {
    if keys.just_pressed(KeyCode::KeyW) || keys.just_pressed(KeyCode::ArrowUp) {
        thrust_event.write(ThrustEvent::Up(true));
    } else if keys.just_released(KeyCode::KeyW) || keys.just_released(KeyCode::ArrowUp) {
        thrust_event.write(ThrustEvent::Up(false));
    }

    if keys.just_pressed(KeyCode::KeyS) || keys.just_pressed(KeyCode::ArrowDown) {
        thrust_event.write(ThrustEvent::Down(true));
    } else if keys.just_released(KeyCode::KeyS) || keys.just_released(KeyCode::ArrowDown) {
        thrust_event.write(ThrustEvent::Down(false));
    }

    if keys.just_pressed(KeyCode::KeyA) || keys.just_pressed(KeyCode::ArrowLeft) {
        thrust_event.write(ThrustEvent::Left(true));
    } else if keys.just_released(KeyCode::KeyA) || keys.just_released(KeyCode::ArrowLeft) {
        thrust_event.write(ThrustEvent::Left(false));
    }

    if keys.just_pressed(KeyCode::KeyD) || keys.just_pressed(KeyCode::ArrowRight) {
        thrust_event.write(ThrustEvent::Right(true));
    } else if keys.just_released(KeyCode::KeyD) || keys.just_released(KeyCode::ArrowRight) {
        thrust_event.write(ThrustEvent::Right(false));
    }
}

fn draw_attachment_debug(
    joints: Query<(&Transform, &JointOf, Option<&Peer>)>,
    snaps: Query<(&Transform, &SnapOf)>,
    parts: Query<&GlobalTransform, With<Part>>,
    mut gizmos: Gizmos,
    state: ResMut<AttachmentDebugRes>,
) {
    if !state.0 {
        return;
    }
    for (offset, parent, peer) in joints.iter() {
        let Ok(parent_pos) = parts.get(parent.0) else {
            continue;
        };
        let joint_target = parent_pos.transform_point(offset.translation);
        gizmos.cross_2d(joint_target.xy(), 4.0, FUCHSIA);

        if let Some(peer_id) = peer && let Ok(peer) = joints.get(peer_id.0) {
            let Ok(peer_parent_pos) = parts.get(peer.1.0) else { continue };
            gizmos.arrow_2d(peer_parent_pos.translation().xy(), peer_parent_pos.translation().xy() 
                    + ((peer.0.rotation * peer_parent_pos.rotation()).mul_vec3(Vec3::Y).xy()*20.0), ORANGE);
            gizmos.arrow_2d(parent_pos.translation().xy(), peer_parent_pos.translation().xy(), WHITE);
        }
    }
    for (offset, parent) in snaps.iter() {
        let Ok(parent_pos) = parts.get(parent.0) else {
            continue;
        };
        let joint_snap = parent_pos.transform_point(offset.translation);
        gizmos.cross_2d(joint_snap.xy(), 4.0, GREEN);
    }
}