use std::ops::DerefMut;

use lyra_engine::{math, ecs::{World, components::{mesh::MeshComponent, transform::TransformComponent, camera::CameraComponent, model::ModelComponent}, atomicell::{Ref, RefMut}, EventQueue}, render::{mesh::Mesh, material::Material, vertex::Vertex, window::{CursorGrabMode, WindowOptions}}, math::Transform, input::{KeyCode, InputButtons, MouseMotion}, game::Game, change_tracker::Ct};

use lyra_engine::assets::{ResourceManager, Texture, Model};

use tracing::debug;

pub const VERTICES: &[Vertex] = &[
    Vertex { position: [-0.0868241, 0.49240386, 0.0], tex_coords: [0.4131759, 0.00759614], }, // A
    Vertex { position: [-0.49513406, 0.06958647, 0.0], tex_coords: [0.0048659444, 0.43041354], }, // B
    Vertex { position: [-0.21918549, -0.44939706, 0.0], tex_coords: [0.28081453, 0.949397], }, // C
    Vertex { position: [0.35966998, -0.3473291, 0.0], tex_coords: [0.85967, 0.84732914], }, // D
    Vertex { position: [0.44147372, 0.2347359, 0.0], tex_coords: [0.9414737, 0.2652641], }, // E
];

pub const INDICES: &[u16] = &[
    0, 1, 4,
    1, 2, 4,
    2, 3, 4,
];

#[derive(Debug, Default)]
struct Point2d {
    x: i32,
    y: i32,
}

impl std::fmt::Display for Point2d {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "(x={}, y={})", self.x, self.y)
    }
}

impl Point2d {
    pub fn new(x: i32, y: i32) -> Self {
        Self {
            x,
            y,
        }
    }
}

#[derive(Debug, Default)]
struct Point3d {
    x: i32,
    y: i32,
    z: i32,
}

impl std::fmt::Display for Point3d {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "(x={}, y={}, z={})", self.x, self.y, self.z)
    }
}

impl Point3d {
    pub fn new(x: i32, y: i32, z: i32) -> Self {
        Self {
            x,
            y,
            z,
        }
    }
}

#[async_std::main]
async fn main() {
    let setup_sys = |world: &mut World| -> anyhow::Result<()> {
        {
            let mut window_options = world.get_resource_mut::<Ct<WindowOptions>>().unwrap();
            window_options.cursor_grab = CursorGrabMode::Confined;
            window_options.cursor_visible = false;
        }

        let mut resman = world.get_resource_mut::<ResourceManager>().unwrap();
        let diffuse_texture = resman.request::<Texture>("assets/happy-tree.png").unwrap();
        let cube_model = resman.request::<Model>("assets/cube-embedded.gltf").unwrap();
        drop(resman);

        /* world.spawn((MeshComponent::new(
            Mesh {
                vertices: VERTICES.to_vec(),
                indices: Some(INDICES.to_vec())
            }, Material {
                shader_id: 0,
                texture: diffuse_texture.clone()
            }),
            TransformComponent::from(Transform::from_xyz(0.005, 0.0, -2.0)),
        ));

        world.spawn((MeshComponent::new(
            Mesh {
                vertices: VERTICES.to_vec(),
                indices: Some(INDICES.to_vec())
            }, Material {
                shader_id: 0,
                texture: diffuse_texture
            }),
            TransformComponent::from(Transform::from_xyz(0.005, 0.7, -0.5)),
        )); */

        world.spawn((
            ModelComponent(cube_model),
            TransformComponent::from(Transform::from_xyz(0.005, 0.5, -1.2)),
        ));

        let mut camera = CameraComponent::new_3d();
        camera.transform.translation += math::Vec3::new(0.0, 0.0, 2.0);
        //camera.transform.rotate_y(Angle::Degrees(-25.0));
        camera.transform.rotate_z(math::Angle::Degrees(-90.0));
        world.spawn((camera,));

        Ok(())
    };

    //world.insert_resource(fps_counter::FPSCounter::new());
    let fps_system = |world: &mut World| -> anyhow::Result<()> {
        let mut counter: RefMut<fps_counter::FPSCounter> = world.get_resource_mut().unwrap();

        let fps = counter.tick();

        debug!("FPS: {fps}");

        Ok(())
    };
    let fps_plugin = move |game: &mut Game| {
        let world = game.world();
        world.insert_resource(fps_counter::FPSCounter::new());

        game.with_system("fps", fps_system, &["input"]);
    };

    let jiggle_system = |world: &mut World| -> anyhow::Result<()> {
        let keys = world.get_resource();
        if keys.is_none() {
            return Ok(());
        }

        let keys: Ref<InputButtons<KeyCode>> = keys.unwrap();

        let speed = 0.001;

        let mut dir_x = 0.0;
        let mut dir_y = 0.0;

        if keys.is_pressed(KeyCode::A) {
            dir_x += speed;
        }
        
        if keys.is_pressed(KeyCode::D) {
            dir_x -= speed;
        }
        
        if keys.is_pressed(KeyCode::S) {
            dir_y += speed;
        }
        
        if keys.is_pressed(KeyCode::W) {
            dir_y -= speed;
        }

        drop(keys);

        if dir_x == 0.0 && dir_y == 0.0 {
            return Ok(());
        }

        //debug!("moving by ({}, {})", dir_x, dir_y);

        for transform in world.query_mut::<(&mut TransformComponent,)>().iter_mut() {
            let t = &mut transform.transform;
            debug!("Translation: {}", t.translation);

            /* t.translation += glam::Vec3::new(0.0, 0.001, 0.0);
            t.translation.x *= -1.0; */
            t.translation.x += dir_x;
            t.translation.y += dir_y;
        }

        let events = world.get_resource_mut::<EventQueue>().unwrap();
        if let Some(mm) = events.read_events::<MouseMotion>() {
            debug!("Mouse motion: {:?}", mm);
        }

        Ok(())
    };

    let jiggle_plugin = move |game: &mut Game| {
        game.with_system("jiggle", jiggle_system, &["input"]);
    };
    
    Game::initialize().await
        .with_plugin(lyra_engine::DefaultPlugins)
        .with_startup_system(setup_sys)
        //.with_plugin(fps_plugin)
        .with_plugin(jiggle_plugin)
        .run().await;
}