// Copyright (c) 2016-2018 Kiwano - Nomango
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#pragma once
#include <kiwano/math/math.h>
#include <kiwano/renderer/TextStyle.hpp>

namespace kiwano
{
	class RenderTarget;
	class Renderer;

	/// \~chinese
	/// @brief 文本布局
	class KGE_API TextLayout
	{
		friend class RenderTarget;
		friend class Renderer;

	public:
		/// \~chinese
		/// @brief 构造空的文本布局
		TextLayout();

		/// \~chinese
		/// @brief 文本布局是否有效
		bool IsValid() const;

		/// \~chinese
		/// @brief 文本布局是否陈旧
		bool IsDirty() const;

		/// \~chinese
		/// @brief 更新文本布局
		/// @note 文本布局是懒更新的，在修改文本布局的属性后需要手动更新
		void Update();

		/// \~chinese
		/// @brief 获取文本
		const String& GetText() const;

		/// \~chinese
		/// @brief 获取文本样式
		const TextStyle& GetStyle() const;

		/// \~chinese
		/// @brief 获取文本行数
		uint32_t GetLineCount() const;

		/// \~chinese
		/// @brief 获取文本布局大小
		Size GetLayoutSize() const;

		/// \~chinese
		/// @brief 设置文本
		void SetText(const String& text);

		/// \~chinese
		/// @brief 设置文本样式
		void SetStyle(const TextStyle& style);

		/// \~chinese
		/// @brief 设置字体
		void SetFont(FontPtr font);

		/// \~chinese
		/// @brief 设置字体族
		void SetFontFamily(String const& family);

		/// \~chinese
		/// @brief 设置字号（默认值为 18）
		void SetFontSize(float size);

		/// \~chinese
		/// @brief 设置字体粗细值（默认值为 FontWeight::Normal）
		void SetFontWeight(uint32_t weight);

		/// \~chinese
		/// @brief 设置文字颜色（默认值为 Color::White）
		void SetColor(Color const& color);

		/// \~chinese
		/// @brief 设置文字斜体（默认值为 false）
		void SetItalic(bool italic);

		/// \~chinese
		/// @brief 设置文本自动换行的宽度
		void SetWrapWidth(float wrap_width);

		/// \~chinese
		/// @brief 设置行间距（默认为 0）
		void SetLineSpacing(float line_spacing);

		/// \~chinese
		/// @brief 设置对齐方式
		void SetAlignment(TextAlign align);

		/// \~chinese
		/// @brief 设置是否显示描边
		void SetOutline(bool enable);

		/// \~chinese
		/// @brief 设置描边颜色
		void SetOutlineColor(Color const& outline_color);

		/// \~chinese
		/// @brief 设置描边线宽
		void SetOutlineWidth(float outline_width);

		/// \~chinese
		/// @brief 设置描边线相交样式
		void SetOutlineStroke(StrokeStyle outline_stroke);

		/// \~chinese
		/// @brief 设置下划线
		/// @param enable 是否显示下划线
		/// @param start 起始位置
		/// @param length 长度
		void SetUnderline(bool enable, uint32_t start, uint32_t length);

		/// \~chinese
		/// @brief 设置删除线
		/// @param enable 是否显示删除线
		/// @param start 起始位置
		/// @param length 长度
		void SetStrikethrough(bool enable, uint32_t start, uint32_t length);

	private:
		ComPtr<IDWriteTextFormat> GetTextFormat() const;

		void SetTextFormat(ComPtr<IDWriteTextFormat> format);

		ComPtr<IDWriteTextLayout> GetTextLayout() const;

		void SetTextLayout(ComPtr<IDWriteTextLayout> layout);

	private:
		enum DirtyFlag : uint8_t
		{
			Clean = 0,
			DirtyFormat = 1,
			DirtyLayout = 1 << 1,
		};
		uint8_t dirty_flag_;

		ComPtr<IDWriteTextFormat> text_format_;
		ComPtr<IDWriteTextLayout> text_layout_;

		String text_;
		TextStyle style_;
	};

	inline bool TextLayout::IsValid() const
	{
		return !!text_layout_;
	}

	inline bool TextLayout::IsDirty() const
	{
		return dirty_flag_ != DirtyFlag::Clean;
	}

	inline const String& TextLayout::GetText() const
	{
		return text_;
	}

	inline const TextStyle& TextLayout::GetStyle() const
	{
		return style_;
	}

	inline ComPtr<IDWriteTextFormat> TextLayout::GetTextFormat() const
	{
		return text_format_;
	}

	inline ComPtr<IDWriteTextLayout> TextLayout::GetTextLayout() const
	{
		return text_layout_;
	}

	inline void TextLayout::SetColor(Color const& color)
	{
		style_.color = color;
	}

	inline void TextLayout::SetTextFormat(ComPtr<IDWriteTextFormat> format)
	{
		text_format_ = format;
	}

	inline void TextLayout::SetTextLayout(ComPtr<IDWriteTextLayout> layout)
	{
		text_layout_ = layout;
	}

	inline void TextLayout::SetOutline(bool enable)
	{
		style_.outline = enable;
	}

	inline void TextLayout::SetOutlineColor(Color const& outline_color)
	{
		style_.outline_color = outline_color;
	}

	inline void TextLayout::SetOutlineWidth(float outline_width)
	{
		style_.outline_width = outline_width;
	}

	inline void TextLayout::SetOutlineStroke(StrokeStyle outline_stroke)
	{
		style_.outline_stroke = outline_stroke;
	}
}