// Copyright (C) 2022 Jérôme "Lynix" Leclercq (lynix680@gmail.com)
// This file is part of the "Nazara Engine - Platform module"
// For conditions of distribution and use, see copyright notice in Config.hpp

#include <Nazara/Platform/SDL2/CursorImpl.hpp>
#include <Nazara/Core/ErrorFlags.hpp>
#include <Nazara/Utility/PixelFormat.hpp>
#include <array>
#include <Nazara/Platform/Debug.hpp>

namespace Nz
{
	namespace
	{
		std::array<SDL_SystemCursor, SystemCursorCount> s_systemCursorIds =
		{
			SDL_SYSTEM_CURSOR_CROSSHAIR, // SystemCursor::Crosshair
			SDL_SYSTEM_CURSOR_ARROW,     // SystemCursor::Default
			SDL_SYSTEM_CURSOR_HAND,      // SystemCursor::Hand
			SDL_SYSTEM_CURSOR_ARROW,     // SystemCursor::Help
			SDL_SYSTEM_CURSOR_SIZEALL,   // SystemCursor::Move
			SDL_NUM_SYSTEM_CURSORS,      // SystemCursor::None
			SDL_SYSTEM_CURSOR_HAND,      // SystemCursor::Pointer
			SDL_SYSTEM_CURSOR_WAITARROW, // SystemCursor::Progress
			SDL_SYSTEM_CURSOR_SIZEWE,    // SystemCursor::ResizeE
			SDL_SYSTEM_CURSOR_SIZENS,    // SystemCursor::ResizeN
			SDL_SYSTEM_CURSOR_SIZENESW,  // SystemCursor::ResizeNE
			SDL_SYSTEM_CURSOR_SIZENWSE,  // SystemCursor::ResizeNW
			SDL_SYSTEM_CURSOR_SIZENS,    // SystemCursor::ResizeS
			SDL_SYSTEM_CURSOR_SIZENWSE,  // SystemCursor::ResizeSE
			SDL_SYSTEM_CURSOR_SIZENESW,  // SystemCursor::ResizeSW
			SDL_SYSTEM_CURSOR_SIZEWE,    // SystemCursor::ResizeW
			SDL_SYSTEM_CURSOR_IBEAM,     // SystemCursor::Text
			SDL_SYSTEM_CURSOR_WAIT       // SystemCursor::Wait
		};

		static_assert(SystemCursorCount == 18, "System cursor array is incomplete");
	}

	CursorImpl::CursorImpl(const Image& cursor, const Vector2i& hotSpot)
	{
		ErrorFlags errFlags(ErrorMode::ThrowException);

		m_cursorImage = cursor;
		if (!m_cursorImage.Convert(PixelFormat::BGRA8))
			NazaraError("Failed to convert icon to BGRA8");

		m_surface = SDL_CreateRGBSurfaceWithFormatFrom(
			m_cursorImage.GetPixels(),
			m_cursorImage.GetWidth(),
			m_cursorImage.GetHeight(),
			32,
			4 * m_cursorImage.GetWidth(),
			SDL_PIXELFORMAT_BGRA32
		);

		if (!m_surface)
			NazaraError("failed to create SDL Surface for cursor: " + std::string(SDL_GetError()));

		m_cursor = SDL_CreateColorCursor(m_surface, hotSpot.x, hotSpot.y);
		if (!m_cursor)
		{
			if (m_surface) //< Just in case exceptions were disabled
				SDL_FreeSurface(m_surface);

			NazaraError("failed to create SDL cursor: " + std::string(SDL_GetError()));
		}
	}

	CursorImpl::CursorImpl(SystemCursor cursor)
	{
		ErrorFlags errFlags(ErrorMode::ThrowException);

		if (cursor != SystemCursor::None)
		{
			m_cursor = SDL_CreateSystemCursor(s_systemCursorIds[UnderlyingCast(cursor)]);
			if (!m_cursor)
				NazaraError("failed to create SDL cursor: " + std::string(SDL_GetError()));
		}
	}

	CursorImpl::~CursorImpl()
	{
		if (m_surface)
			SDL_FreeSurface(m_surface);

		if (m_cursor)
			SDL_FreeCursor(m_cursor);
	}

	SDL_Cursor* CursorImpl::GetCursor()
	{
		return m_cursor;
	}
}