//! # sylpheed-viewer
//!
//! Bevy-based asset viewer for Project Sylpheed: Arc of Deception.
//!
//! This crate serves as both:
//! - A **native binary** (via `main.rs`) — full desktop viewer
//! - A **WASM library** (this file) — browser viewer at `index.html`
//!
//! ## Architecture
//! - `sylpheed_formats` handles all binary parsing — no Bevy dependency
//! - This crate is the thin Bevy integration layer on top
//! - `asset_loader` bridges the two: wraps parsers as `AssetLoader` impls
//!
//! ## WASM notes
//! On the web, local file access is unavailable. Assets must be
//! pre-extracted and served over HTTP. XISO reading is native-only.

use bevy::prelude::*;
use bevy_egui::EguiPlugin;

pub mod asset_loader;
pub mod camera;
pub mod iso_loader;
pub mod ui;

// ── Application state ────────────────────────────────────────────────────────

/// Global viewer state, shared across all UI and rendering systems.
#[derive(Resource)]
pub struct ViewerState {
    /// Which type of asset is currently being browsed / previewed.
    pub current_mode: ViewMode,
    /// Whether to render meshes in wireframe mode (toggle with F2).
    pub wireframe: bool,
}

impl Default for ViewerState {
    fn default() -> Self {
        Self {
            current_mode: ViewMode::Textures,
            wireframe: false,
        }
    }
}

/// The active view / asset type being inspected.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub enum ViewMode {
    /// XPR2 texture preview (Milestone 1).
    #[default]
    Textures,
    /// 3D mesh viewer (Milestone 2+).
    Mesh,
    /// Audio waveform / playback (Milestone 2+).
    Audio,
}

// ── App builder ──────────────────────────────────────────────────────────────

/// Build and run the viewer application.
///
/// Called from `main.rs` on native and from `wasm_bindgen` init on the web.
pub fn run() {
    let mut app = App::new();

    app.add_plugins(
        DefaultPlugins.set(WindowPlugin {
            primary_window: Some(Window {
                title: "Project Sylpheed: Arc of Deception — Asset Viewer".into(),
                resolution: (1280.0, 720.0).into(),
                ..default()
            }),
            ..default()
        }),
    );

    app.add_plugins(EguiPlugin);
    app.add_plugins(asset_loader::SylpheedAssetPlugin);
    app.add_plugins(iso_loader::IsoLoaderPlugin);
    app.add_plugins(camera::OrbitCameraPlugin);
    app.add_plugins(ui::ViewerUiPlugin);

    app.init_resource::<ViewerState>();

    // Minimal 3D scene: a directional light so meshes are visible
    app.add_systems(Startup, setup_scene);

    app.run();
}

fn setup_scene(mut commands: Commands) {
    commands.spawn(DirectionalLight {
        illuminance: 10_000.0,
        shadows_enabled: true,
        ..default()
    });
}