use crate::asset::AssetManager;
use crate::audio::Audio;
use crate::frame_composer::FrameComposer;
use crate::gfx::Gfx;
use crate::memory_banks::{
    GlyphBankPoolAccess, GlyphBankPoolInstaller, MemoryBanks, SceneBankPoolAccess,
    SceneBankPoolInstaller, SoundBankPoolAccess, SoundBankPoolInstaller,
};
use crate::pad::Pad;
use crate::touch::Touch;
use prometeu_hal::cartridge::AssetsPayloadSource;
use prometeu_hal::sprite::Sprite;
use prometeu_hal::{AssetBridge, AudioBridge, GfxBridge, HardwareBridge, PadBridge, TouchBridge};
use std::sync::Arc;

/// Aggregate structure for all virtual hardware peripherals.
///
/// This struct represents the "Mainboard" of the PROMETEU console.
/// It acts as a container for all hardware subsystems. In the Prometeu
/// architecture, hardware is decoupled from the OS and VM, allowing
/// for easier testing and different host implementations (Desktop, Web, etc.).
///
/// ### Console Specifications:
/// - **Resolution**: 320x180 (16:9 Aspect Ratio).
/// - **Color Depth**: RGB565 (16-bit).
/// - **Audio**: Stereo, Command-based mixing.
/// - **Input**: 12-button Digital Gamepad + Absolute Touch/Mouse.
pub struct Hardware {
    /// The Graphics Processing Unit (GPU). Handles drawing primitives, sprites, and tilemaps.
    pub gfx: Gfx,
    /// Canonical frame orchestration owner for scene/camera/cache/resolver/sprites.
    pub frame_composer: FrameComposer,
    /// The Sound Processing Unit (SPU). Manages sample playback and volume control.
    pub audio: Audio,
    /// The standard digital gamepad. Provides state for D-Pad, face buttons, and triggers.
    pub pad: Pad,
    /// The absolute pointer input device (Mouse/Touchscreen).
    pub touch: Touch,
    /// The Asset Management system (DMA). Handles loading data into VRAM (GlyphBanks) and ARAM (SoundBanks).
    pub assets: AssetManager,
}

impl Default for Hardware {
    fn default() -> Self {
        Self::new()
    }
}

impl HardwareBridge for Hardware {
    fn begin_frame(&mut self) {
        self.gfx.begin_overlay_frame();
        self.frame_composer.begin_frame();
    }

    fn bind_scene(&mut self, scene_bank_id: usize) -> bool {
        self.frame_composer.bind_scene(scene_bank_id)
    }

    fn unbind_scene(&mut self) {
        self.frame_composer.unbind_scene();
    }

    fn set_camera(&mut self, x: i32, y: i32) {
        self.frame_composer.set_camera(x, y);
    }

    fn emit_sprite(&mut self, sprite: Sprite) -> bool {
        self.frame_composer.emit_sprite(sprite)
    }

    fn render_frame(&mut self) {
        self.frame_composer.render_frame(&mut self.gfx);
        self.gfx.drain_overlay_debug();
    }

    fn has_glyph_bank(&self, bank_id: usize) -> bool {
        self.gfx.glyph_banks.glyph_bank_slot(bank_id).is_some()
    }

    fn gfx(&self) -> &dyn GfxBridge {
        &self.gfx
    }
    fn gfx_mut(&mut self) -> &mut dyn GfxBridge {
        &mut self.gfx
    }

    fn audio(&self) -> &dyn AudioBridge {
        &self.audio
    }
    fn audio_mut(&mut self) -> &mut dyn AudioBridge {
        &mut self.audio
    }

    fn pad(&self) -> &dyn PadBridge {
        &self.pad
    }
    fn pad_mut(&mut self) -> &mut dyn PadBridge {
        &mut self.pad
    }

    fn touch(&self) -> &dyn TouchBridge {
        &self.touch
    }
    fn touch_mut(&mut self) -> &mut dyn TouchBridge {
        &mut self.touch
    }

    fn assets(&self) -> &dyn AssetBridge {
        &self.assets
    }
    fn assets_mut(&mut self) -> &mut dyn AssetBridge {
        &mut self.assets
    }
}

impl Hardware {
    /// Internal hardware width in pixels.
    pub const W: usize = 320;
    /// Internal hardware height in pixels.
    pub const H: usize = 180;

    /// Creates a fresh hardware instance with default settings.
    pub fn new() -> Self {
        Self::new_with_memory_banks(Arc::new(MemoryBanks::new()))
    }

    /// Creates hardware with explicit shared bank ownership.
    pub fn new_with_memory_banks(memory_banks: Arc<MemoryBanks>) -> Self {
        Self {
            gfx: Gfx::new(
                Self::W,
                Self::H,
                Arc::clone(&memory_banks) as Arc<dyn GlyphBankPoolAccess>,
            ),
            frame_composer: FrameComposer::new(
                Self::W,
                Self::H,
                Arc::clone(&memory_banks) as Arc<dyn SceneBankPoolAccess>,
            ),
            audio: Audio::new(Arc::clone(&memory_banks) as Arc<dyn SoundBankPoolAccess>),
            pad: Pad::default(),
            touch: Touch::default(),
            assets: AssetManager::new(
                vec![],
                AssetsPayloadSource::empty(),
                Arc::clone(&memory_banks) as Arc<dyn GlyphBankPoolInstaller>,
                Arc::clone(&memory_banks) as Arc<dyn SoundBankPoolInstaller>,
                Arc::clone(&memory_banks) as Arc<dyn SceneBankPoolInstaller>,
            ),
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::memory_banks::{
        GlyphBankPoolInstaller, SceneBankPoolAccess, SceneBankPoolInstaller,
    };
    use prometeu_hal::color::Color;
    use prometeu_hal::glyph::Glyph;
    use prometeu_hal::glyph_bank::{GlyphBank, TileSize};
    use prometeu_hal::scene_bank::SceneBank;
    use prometeu_hal::scene_layer::{ParallaxFactor, SceneLayer};
    use prometeu_hal::scene_viewport_cache::SceneViewportCache;
    use prometeu_hal::scene_viewport_resolver::SceneViewportResolver;
    use prometeu_hal::tile::Tile;
    use prometeu_hal::tilemap::TileMap;

    fn make_glyph_bank() -> GlyphBank {
        let mut bank = GlyphBank::new(TileSize::Size8, 8, 8);
        bank.palettes[0][1] = Color::RED;
        for pixel in &mut bank.pixel_indices {
            *pixel = 1;
        }
        bank
    }

    fn make_scene() -> SceneBank {
        let layer = SceneLayer {
            active: true,
            glyph_bank_id: 0,
            tile_size: TileSize::Size8,
            parallax_factor: ParallaxFactor { x: 1.0, y: 1.0 },
            tilemap: TileMap {
                width: 4,
                height: 4,
                tiles: vec![
                    Tile {
                        active: true,
                        glyph: Glyph { glyph_id: 0, palette_id: 0 },
                        flip_x: false,
                        flip_y: false,
                    };
                    16
                ],
            },
        };

        SceneBank { layers: std::array::from_fn(|_| layer.clone()) }
    }

    #[test]
    fn hardware_can_render_scene_from_shared_scene_bank_pipeline() {
        let banks = Arc::new(MemoryBanks::new());
        banks.install_glyph_bank(0, Arc::new(make_glyph_bank()));
        banks.install_scene_bank(0, Arc::new(make_scene()));

        let mut hardware = Hardware::new_with_memory_banks(Arc::clone(&banks));
        let scene = banks.scene_bank_slot(0).expect("scene bank slot 0 should be resident");
        let mut cache = SceneViewportCache::new(&scene, 4, 4);
        cache.materialize_all_layers(&scene);

        let mut resolver = SceneViewportResolver::new(16, 16, 4, 4, 12, 20);
        let update = resolver.update(&scene, 0, 0);

        hardware.gfx.scene_fade_level = 31;
        hardware.gfx.hud_fade_level = 31;
        hardware.gfx.render_scene_from_cache(&cache, &update);
        hardware.gfx.present();

        assert_eq!(hardware.gfx.front_buffer()[0], Color::RED.raw());
    }

    #[test]
    fn hardware_constructs_frame_composer_with_shared_scene_bank_access() {
        let banks = Arc::new(MemoryBanks::new());
        banks.install_scene_bank(2, Arc::new(make_scene()));

        let hardware = Hardware::new_with_memory_banks(banks);
        let scene = hardware
            .frame_composer
            .scene_bank_slot(2)
            .expect("scene bank slot 2 should be resident");

        assert_eq!(hardware.frame_composer.viewport_size(), (Hardware::W, Hardware::H));
        assert_eq!(hardware.frame_composer.scene_bank_slot_count(), 16);
        assert_eq!(scene.layers[0].tile_size, TileSize::Size8);
    }
}