#pragma once

#include "Canvas.h"
#include "Font.h"
#include "../LevelHandler.h"
#include "../Actors/Player.h"
#include "../Input/ControlScheme.h"
#include "../Input/RgbLights.h"
#include "../Rendering/PlayerViewport.h"

#include "../../nCine/Input/InputEvents.h"

#if defined(WITH_ANGELSCRIPT)
namespace Jazz2::Scripting
{
	class LevelScriptLoader;
}

namespace Jazz2::Scripting::Legacy
{
	struct jjCANVAS;
}
#endif

namespace Jazz2::UI
{
	/**
		@brief Player HUD
		
		In-game heads-up display drawn on top of the level. It renders the player's health, score, collected coins and
		gems, active weapon and ammo, boss health, transient level text notifications, and the weapon wheel, as well as
		on-screen touch controls and fade transitions. Individual elements are drawn through overridable `OnDraw*`
		methods so subclasses (e.g., multiplayer) can customize them.
	*/
	class HUD : public Canvas
	{
#if defined(WITH_ANGELSCRIPT)
		friend class Scripting::LevelScriptLoader;
		friend struct Scripting::Legacy::jjCANVAS;
#endif

	public:
#ifndef DOXYGEN_GENERATING_OUTPUT
		static constexpr float DpadLeft = 0.02f;
		static constexpr float DpadBottom = 0.1f;
		static constexpr float DpadThreshold = 0.09f;
		static constexpr float DpadSize = 0.37f;
		static constexpr float ButtonSize = 0.172f;
		static constexpr float SmallButtonSize = 0.098f;
#endif

		/** @brief Creates a new instance */
		HUD(LevelHandler* levelHandler);
		~HUD();

		void OnUpdate(float timeMult) override;
		bool OnDraw(RenderQueue& renderQueue) override;
		/** @brief Called when a touch event occurs, allowing the HUD to override actions and movement */
		void OnTouchEvent(const TouchEvent& event, std::uint32_t& overrideActions, Vector2f& overrideMovement);

		/** @brief Shows a text notification */
		void ShowLevelText(StringView text);
		/** @brief Shows a notification about coins */
		void ShowCoins(std::int32_t count);
		/** @brief Shows a notification about gems */
		void ShowGems(std::uint8_t gemType, std::int32_t count);

		/** @brief Begins a fullscreen fade-in transition */
		void BeginFadeIn(bool skip);
		/** @brief Begins a fullscreen face-out transition */
		void BeginFadeOut(float delay = 0.0f);

		/** @brief Returns `true` if weapon wheel is visible */
		bool IsWeaponWheelVisible(std::int32_t playerIndex) const;

		/** @brief Rebuilds internal touch button data from current @ref PreferencesCache::TouchButtons configuration */
		void RefreshTouchButtons();

	protected:
#ifndef DOXYGEN_GENERATING_OUTPUT
		// Doxygen 1.12.0 outputs also private structs/unions even if it shouldn't
		struct TouchButtonInfo {
			PlayerAction Action;

			float Left;
			float Top;
			float Width;
			float Height;

			AnimState State;
			std::int32_t CurrentPointerId;
			Alignment Align;
		};

		struct Vertex {
			float X, Y;
			float U, V;

			Vertex()
				: X(0.0f), Y(0.0f), U(0.0f), V(0.0f) {}
			Vertex(float x, float y, float u, float v)
				: X(x), Y(y), U(u), V(v) {}
		};

		struct WeaponWheelState {
			SmallVector<std::unique_ptr<RenderCommand>, 0> RenderCommands;
			std::unique_ptr<Vertex[]> Vertices;
			std::int32_t WeaponCount;
			std::int32_t  RenderCommandsCount;
			std::int32_t VerticesCount;
			std::int32_t LastIndex;
			float Anim;
			bool Shown;

			WeaponWheelState();
		};
#endif

		/** @{ @name Constants */

		/** @brief Main layer */
		static constexpr std::uint16_t MainLayer = 100;
		/** @brief Shadow for main layer */
		static constexpr std::uint16_t ShadowLayer = 80;
		/** @brief Font layer */
		static constexpr std::uint16_t FontLayer = 200;
		/** @brief Shadow for font layer */
		static constexpr std::uint16_t FontShadowLayer = 120;
		/** @brief Touch buttons layer */
		static constexpr std::uint16_t TouchButtonsLayer = 400;

		/** @} */
		
#ifndef DOXYGEN_GENERATING_OUTPUT
		LevelHandler* _levelHandler;
		Metadata* _metadata;
		// Indexed copy of the HUD metadata (loaded on demand), used to draw the recolored player character icon
		Metadata* _metadataIndexed;
		Font* _smallFont;

		String _levelText;
		float _levelTextTime;
		std::int32_t _coins;
		std::int32_t _gems;
		float _coinsTime;
		float _gemsTime;
		std::uint8_t _gemsLastType;
		float _activeBossTime;
#endif

		/** @brief Called when some overview information of the player needs to be drawn */
		virtual void OnDrawOverview(const Rectf& view, const Rectf& adjustedView, Actors::Player* player);
		/** @brief Called when health of the player needs to be drawn */
		virtual void OnDrawHealth(const Rectf& view, const Rectf& adjustedView, Actors::Player* player);
		/** @brief Called when score of the player needs to be drawn */
		virtual void OnDrawScore(const Rectf& view, Actors::Player* player);
		/** @brief Called when weapon ammo of the player needs to be drawn */
		virtual void OnDrawWeaponAmmo(const Rectf& adjustedView, Actors::Player* player);
		/** @brief Called when health of the active boss needs to be drawn */
		virtual void OnDrawActiveBoss(const Rectf& adjustedView);
		/** @brief Called when a text notification needs to be drawn */
		virtual void OnDrawLevelText(std::int32_t& charOffset);
		/** @brief Called when a notification about coins of the player needs to be drawn */
		virtual void OnDrawCoins(const Rectf& view, std::int32_t& charOffset);
		/** @brief Called when a notification about gems of the player needs to be drawn */
		virtual void OnDrawGems(const Rectf& view, std::int32_t& charOffset);
		/** @brief Called when touch buttons need to be drawn */
		void OnDrawTouchButtons(Actors::Player* player);
		/** @brief Returns `true` and the on-screen bounds of the touch pause button if it's currently visible */
		bool GetTouchPauseButtonRect(Rectf& bounds) const;

		/** @brief Draws carrotized health bar (Reforged) */
		void DrawHealthCarrots(float x, float y, std::int32_t health);
		/** @brief Draws separators of split-screen viewports */
		void DrawViewportSeparators();
		/** @brief Draws a textured element */
		void DrawElement(AnimState state, std::int32_t frame, float x, float y, std::uint16_t z, Alignment align, const Colorf& color,
			float scaleX = 1.0f, float scaleY = 1.0f, bool additiveBlending = false, float angle = 0.0f);
		/**
		 * @brief Draws a textured element recolored through a player palette (PaletteRemap shader)
		 *
		 * Returns `false` if it can't (no indexed metadata or the element isn't an indexed sprite) so the caller can
		 * fall back.
		 */
		bool DrawElementWithPalette(AnimState state, std::int32_t frame, float x, float y, std::uint16_t z, Alignment align,
			const Colorf& color, float paletteOffset, float scaleX = 1.0f, float scaleY = 1.0f);
		/** @brief Draws a textured element with clipping */
		void DrawElementClipped(AnimState state, std::int32_t frame, float x, float y, std::uint16_t z, Alignment align,
			const Colorf& color, float clipX, float clipY);
	
	private:
		enum class TransitionState {
			None,
			WaitingForFadeIn,
			FadeIn,
			FadeOut,
			WaitingForFadeOut
		};

		static constexpr std::uint32_t VertexBytes = sizeof(Vertex);
		static constexpr std::uint32_t VertexFloats = VertexBytes / sizeof(float);

		static constexpr Alignment Fixed = (Alignment)0x40;
		static constexpr Alignment AllowRollover = (Alignment)0x80;

		static constexpr std::int32_t TouchButtonsCount = 11;
		static constexpr float WeaponWheelAnimDuration = 20.0f;
		static constexpr std::int32_t WeaponWheelMaxVertices = 768;
		static constexpr float DefaultRef = LevelHandler::DefaultWidth * 0.5f; // = 360.0f

		float _rgbAmbientLight;
		float _rgbHealthLast;

		WeaponWheelState _weaponWheel[ControlScheme::MaxSupportedPlayers];
		float _rgbLightsAnim;
		float _rgbLightsTime;
		TransitionState _transitionState;
		float _transitionTime;

		TouchButtonInfo _touchButtons[TouchButtonsCount];
		float _touchButtonsTimer;

		// Floating analog joystick state
		bool _joystickActive;
		Vector2f _joystickOrigin;
		Vector2f _joystickCurrent;
		std::int32_t _joystickPointerId;
		float _joystickMaxRadius;

		AnimState GetCurrentWeapon(Actors::Player* player, WeaponType weapon, Vector2f& offset);
		void DrawWeaponWheel(const Rectf& view, Actors::Player* player);
		void UpdateWeaponWheel(float timeMult);
		bool PrepareWeaponWheel(Actors::Player* player, std::int32_t& weaponCount);
		static std::int32_t GetWeaponCount(Actors::Player* player);
		void DrawWeaponWheelSegment(WeaponWheelState& state, float x, float y, float width, float height, std::uint16_t z, float minAngle, float maxAngle, const Texture& texture, const Colorf& color);

		TouchButtonInfo MakeTouchButton(PlayerAction action, AnimState state, Alignment align, float edgeX, float edgeY, float w, float h);
		TouchButtonInfo CreateTouchButton(PlayerAction action, AnimState state, Alignment align, float x, float y, float w, float h);
		bool IsOnButton(const TouchButtonInfo& button, float x, float y);
		void DrawJoystick(float centerX, float centerY, float outerRadius, float innerRadius, float thumbX, float thumbY);

		void UpdateRgbLights(float timeMult, Rendering::PlayerViewport* viewport);
		static Color ApplyRgbGradientAlpha(Color color, std::int32_t x, std::int32_t y, float animProgress, float ambientLight);
		static AuraLight KeyToAuraLight(Keys key);
	};
}