use bevy::{
    prelude::*,
    ui_widgets::ScrollbarPlugin,
};
use bevy_common_assets::toml::TomlAssetPlugin;
use bevy_rapier2d::{
    prelude::*,
    rapier::prelude::IntegrationParameters,
};

pub mod input;
pub mod inventory;
pub mod item;
pub mod layout;
pub mod player;
#[cfg(test)]
mod tests;
pub mod ui;

pub const PIXELS_PER_METER: f32 = 16.0;

pub struct ExpeditionPlugin;

#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, Default, States, Reflect)]
#[reflect(Clone, PartialEq, Debug, Default, Hash, State)]
pub enum GameState {
    #[default]
    Running,
    Inventory,
}

#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, Default, States, Reflect)]
#[reflect(Clone, PartialEq, Debug, Default, Hash, State)]
pub enum LoadingState {
    #[default]
    Loading,
    Ready,
}

fn camera_bundle() -> impl Bundle {
    (
        Camera2d,
        Camera {
            clear_color: ClearColorConfig::Custom(Color::hsl(0.02, 0.67, 0.65)),
            ..default()
        },
        Projection::Orthographic(OrthographicProjection {
            scaling_mode: bevy::camera::ScalingMode::FixedVertical {
                viewport_height: 384.,
            },
            scale: 1.,
            ..OrthographicProjection::default_2d()
        }),
        Name::new("Camera2d"),
    )
}

fn insert_entity_name(names: Query<(Entity, &mut Name), Added<Name>>) {
    for (entity, mut name) in names {
        name.mutate(|name| name.insert_str(0, format!("{entity}: ").as_str()));
    }
}

#[inline(always)]
pub const fn meters(value: f32) -> f32 {
    PIXELS_PER_METER * value
}

fn setup_global(mut commands: Commands) {
    commands.spawn(camera_bundle());
    commands.spawn(ui::UiRoot::new());
}

impl Plugin for ExpeditionPlugin {
    fn build(&self, app: &mut App) {
        let rapier_init = RapierContextInitialization::InitializeDefaultRapierContext {
            integration_parameters: IntegrationParameters {
                length_unit: PIXELS_PER_METER,
                ..default()
            }, 
            rapier_configuration: RapierConfiguration {
                gravity: Vec2::ZERO,
                physics_pipeline_active: true,
                scaled_shape_subdivision: 10,
                force_update_from_transform_changes: false,
            },
        };
        app.add_plugins((
                RapierDebugRenderPlugin::default(),
                RapierPhysicsPlugin::<()>::default()
                    .with_custom_initialization(rapier_init),
                ScrollbarPlugin,
                TomlAssetPlugin::<layout::asset::structs::LevelAsset>::new(&["toml"]),
                input::plugin::InputAssetPlugin::<input::InputAction>::default(),
                input::plugin::InputAssetPlugin::<input::UiAction>::default(),
            ))
            .init_state::<LoadingState>()
            .init_state::<GameState>()
            .insert_resource(ui::WindowSize::default())
            .add_systems(Startup, (
                setup_global,
                layout::systems::setup_world,
            ))
            .add_systems(Update, (
                insert_entity_name,
                layout::asset::check_loading
                    .run_if(|state: Res<State<LoadingState>>| *state == LoadingState::Loading),
                layout::systems::detect_interact_collisions,
                layout::systems::lock_door,
                player::systems::handle_input,
                ui::update_window_size,
                ui::handle_input,
            ))
            .add_systems(OnEnter(LoadingState::Ready), layout::asset::load_level)
            .add_systems(OnEnter(GameState::Inventory), ui::inventory::systems::setup_ui_inventory)
            .add_systems(OnExit(GameState::Inventory), ui::inventory::systems::clear_ui_inventory)
            .add_observer(ui::inventory::observers::on_ui_rotate)
            .add_observer(layout::container::on_container_interact)
            .add_observer(layout::door::on_door_interact)
            .add_observer(layout::lock::on_padlock_interaction)
            .add_observer(layout::stairs::on_stairs_interact);
    }
}