#pragma once

#include "common.h"
#include <QHash>

/// <summary>
/// 翻译单元抽象接口
/// </summary>
class ExtractUnit : public Serializable {
public:
	virtual ~ExtractUnit() = default;

	/// <summary>
	/// 单元名称
	/// </summary>
	/// <returns></returns>
	virtual QString name() const = 0;

	/// <summary>
	/// 
	/// </summary>
	/// <returns></returns>
	virtual DataType outType() const = 0;
	/// <summary>
	/// 设置偏移字节数量
	/// </summary>
	/// <param name="bytes"></param>
	virtual bool setOffsetSpan(int bytes) = 0;
	/// <summary>
	/// 从上一个单元字节偏移字节数量
	/// </summary>
	/// <returns></returns>
	virtual int offsetSpan() const = 0;
	/// <summary>
	/// 解析所用的字节数量
	/// </summary>
	/// <returns></returns>
	virtual int countWithin() const = 0;

	/// <summary>
	/// 执行解析过程
	/// </summary>
	/// <param name="bytes"></param>
	/// <returns></returns>
	virtual QVariant parse(const QByteArray& bytes) const = 0;
};

/// <summary>
/// 尺寸解析器
/// </summary>
class SizeProvider {
public:
	virtual QString name() const = 0;
	/// <summary>
	/// 获取值，如果该值无法预先计算得知，返回-1
	/// </summary>
	/// <returns>尺寸值</returns>
	virtual int32_t value(const QString& expr) const = 0;

	virtual void setExpression(const QString& expr) = 0;
	virtual QString expression() const = 0;
};

/// <summary>
/// 规则匹配器
/// </summary>
class RuleMatch {
public:
	virtual QString name() const = 0;
	virtual std::shared_ptr<ExtractUnit> bindRule() const = 0;
	virtual bool checkpass(const QByteArray& buffer) const = 0;
};


namespace extract {
	class AbstractExtractor : public ExtractUnit {
	public:
		struct __Private {
			QString name_store = "";
			DataType type_store = DataType::Integer;
			int byte_offset = 0, byte_count = 1;
		} _abs_data;

		AbstractExtractor(const QString& name, DataType data);
		virtual bool setCountWithin(int bytes);

		// ExtractUnit ===========================
		QString name() const override;
		virtual DataType outType() const;
		/// <summary>
		/// 设置偏移字节数量
		/// </summary>
		/// <param name="bytes"></param>
		virtual bool setOffsetSpan(int bytes);
		int offsetSpan() const override;
		int countWithin() const override;

		// Serializable ==============================
		void loadFrom(std::shared_ptr<TranslateBasic> core, const QJsonObject& obj) override;
		void saveTo(QJsonObject& obj) const override;
	};

	/// <summary>
	/// 转换源数值未16进制数值，默认分割方式
	/// </summary>
	class BytesAsHex : public AbstractExtractor {
	public:
		BytesAsHex();

		QVariant parse(const QByteArray& bytes) const override;
		std::shared_ptr<Serializable> newDefault() const override;
	};

	/// <summary>
	/// 转换源数值为位联合
	/// </summary>
	class BytesAsBitCombine : public AbstractExtractor {
	public:
		struct __Private {
			QHash<int, QString> _switch_options;
		} _combine;

		BytesAsBitCombine();

		bool setSwitchOption(int bit_index, const QString& keyword);
		QHash<int, QString> switchOptions() const;
		virtual void clearOptions();

		// ExtractUnit ============================
		QVariant parse(const QByteArray& bytes) const override;

		// Serializable ==============================
		void loadFrom(std::shared_ptr<TranslateBasic> core, const QJsonObject& obj) override;
		void saveTo(QJsonObject& obj) const override;
		std::shared_ptr<Serializable> newDefault() const override;
	};

	/// <summary>
	/// 转换源数据为整形
	/// </summary>
	class BytesAsInteger : public AbstractExtractor {
	public:
		BytesAsInteger();

		// ExtractUnit ============================
		bool setCountWithin(int bytes) override;
		QVariant parse(const QByteArray& bytes) const override;

		// Serializable ==============================
		std::shared_ptr<Serializable> newDefault() const override;
	};

	/// <summary>
	/// 转换源数据为整形
	/// </summary>
	class BytesAsUnsigned : public AbstractExtractor {
	public:
		BytesAsUnsigned();

		// ExtractUnit ============================
		bool setCountWithin(int bytes) override;
		QVariant parse(const QByteArray& bytes) const override;

		// Serializable ==============================
		std::shared_ptr<Serializable> newDefault() const override;
	};

	/// <summary>
	/// 转换源数据为字符串
	/// </summary>
	class BytesAsString : public AbstractExtractor {
	public:
		struct __Private {
			QTextCodec* _conv_with = nullptr;
		} _strings;

	public:
		BytesAsString();

		void setStrCodec(QTextCodec* ins);
		QString codecName() const;

		// ExtractUnit ============================
		QVariant parse(const QByteArray& bytes) const override;

		// Serializable ==============================
		void loadFrom(std::shared_ptr<TranslateBasic> core, const QJsonObject& obj) override;
		void saveTo(QJsonObject& obj) const override;
		std::shared_ptr<Serializable> newDefault() const override;
	};

	class BytesAsFloat : public AbstractExtractor {
	public:
		BytesAsFloat();

		QVariant parse(const QByteArray& bytes) const override;
		std::shared_ptr<Serializable> newDefault() const override;
	};

	class BytesAsDouble : public AbstractExtractor {
	public:
		BytesAsDouble();

		QVariant parse(const QByteArray& bytes) const override;
		std::shared_ptr<Serializable> newDefault() const override;
	};


	class BytesAsList : public ExtractUnit {
	public:
		struct __Private {
			std::shared_ptr<ExtractUnit> _bind_unit = nullptr;
			int _bytes_offset = 0;
			std::shared_ptr<SizeProvider> _bind_size_v = nullptr;
		} _list;

	public:
		bool setOffsetSpan(int value);
		std::shared_ptr<ExtractUnit> elementRule() const;
		bool appendElementRule(std::shared_ptr<ExtractUnit> u);
		std::shared_ptr<SizeProvider> sizeProvider() const;
		bool setSizeProvider(std::shared_ptr<SizeProvider> ins);

	public:
		QString name() const override;
		DataType outType() const override;
		int offsetSpan() const override;
		int countWithin() const override;

		void loadFrom(std::shared_ptr<TranslateBasic> core, const QJsonObject& obj) override;
		void saveTo(QJsonObject& obj) const override;

		QVariant parse(const QByteArray& bytes) const override;
		std::shared_ptr<Serializable> newDefault() const override;

	};

	class BytesAsUnion : public ExtractUnit {
	public:
		struct __Private {
			int byte_offset = 0, byte_count = 1;
			QList<std::shared_ptr<RuleMatch>> _rule_list;
		} _union;

	public:
		bool setCountWithin(int bytes);

		void clearRules();
		QList<std::shared_ptr<RuleMatch>> elementRules() const;
		bool appendElementRule(std::shared_ptr<RuleMatch> u);

	public:
		QString name() const override;
		DataType outType() const override;
		bool setOffsetSpan(int value);
		int offsetSpan() const override;
		int countWithin() const override;

		QVariant parse(const QByteArray& bytes) const override;
		void loadFrom(std::shared_ptr<TranslateBasic> core, const QJsonObject& obj) override;
		void saveTo(QJsonObject& obj) const override;

		std::shared_ptr<Serializable> newDefault() const override;
	};
}