#pragma once

#include "textpresents.h"

namespace wstext_model {
	typedef QList<uint32_t> CharStream;

	class CharSetU16 {
	public:
		static CharStream combineToU(const QString &buffer);
		static QString splitToC(const CharStream &buffer);
		static bool contains(uint32_t code);
		static uint size();
	};

	/**
	 * @brief 聚合体类型
	 */
	enum class AssembleType {
		INLINE_ELEMENT,
		FRAGMENT,
		DOCUMENT,
	};

	/**
	 * @brief 内存实例接口
	 */
	class Element : public std::enable_shared_from_this<Element> {
	public:
		explicit Element(AssembleType t);
		explicit Element(const Element & other);

		AssembleType baseType() const;
		qulonglong hashCode() const;

		virtual std::shared_ptr<const Element> clone() const;
		virtual qulonglong pos() const;

	private:
		AssembleType type_store;
	};

	class WsChar : public Element {
	private:
		uint32_t code_store;

	public:
		explicit WsChar(uint32_t code);
		virtual ~WsChar() = default;

		uint32_t code() const;

		static QList<std::shared_ptr<const WsChar>> convertFrom(const QString &text);
	};


	class WsPart : public Element {
	public:
		/**
		 * 获取指定元素的所有权.
		 *
		 * \param text
		 * \param offset
		 */
		std::shared_ptr<const WsPart> insertChars(const QList<std::shared_ptr<const WsChar>> &text, uint32_t offset = -1);
		QList<std::shared_ptr<const WsChar>> getChars(uint32_t offset, uint32_t count) const;
		std::shared_ptr<const WsPart> delChars(uint32_t offset, uint32_t count);

		std::shared_ptr<const WsPart> mergeFrom(const QList<std::shared_ptr<const Element>> &mbrs);
	};

	class LIBWSTEXTEDIT_EXPORT WsBlock {
	private:
		QList<Element*> element_store;

	public:
		uint32_t blockIndex() const;
		void addElements(const QList<Element*> &text, uint32_t offset = UINT32_MAX);
		QList<Element*> getElements(uint32_t offset, uint32_t count) const;
		void delElements(uint32_t offset, uint32_t count);
		QString toText() const;
	};

	class LIBWSTEXTEDIT_EXPORT WsDocument : public QObject {
		Q_OBJECT
	private:
		std::shared_ptr<wstext_present::DocFormat> document_format;
		QList<std::shared_ptr<WsBlock>> block_store;

	public:
		void bindFormat(std::shared_ptr<wstext_present::DocFormat> f);
		std::shared_ptr<wstext_present::DocFormat> getFormat() const;

		void addBlocks(const QList<std::shared_ptr<WsBlock>> &blks, uint32_t offset = UINT32_MAX);
		uint32_t blockCount() const;
		QList<std::shared_ptr<WsBlock>> getBlocks(uint32_t offset, uint32_t count = 1) const;
		void delBlocks(uint32_t offset, uint32_t count = 1);

		QString toPlainText() const;
		void setPlainText(const QString &text);

	};
}