#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;
};

namespace extract {
	class AbstractExtractor : public ExtractUnit {
	private:
		QString _name_store;
		DataType _type_store;
		int _byte_offset, _byte_count;

	public:
		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(const QJsonObject& obj) override;
		void saveTo(QJsonObject& obj) const override;
	};

#define NAME(u) #u
#define INT32_SAVE(varx) obj[NAME(varx)] = varx;
#define INT32_PEAK(varx) varx = obj[NAME(varx)].toInt();
#define STRLIST_SAVE(list) obj[NAME(list)] = list.join(";");
#define STRLIST_PEAK(list) list = obj[NAME(list)].toString().split(";");
#define STRING_PEAK(codec_name) codec_name = obj[NAME(codec_name)].toString();
#define STRING_SAVE(codec_name) obj[NAME(codec_name)] = codec_name;

	/// <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 {
	private:
		QHash<int, QString> _switch_options;

	public:
		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(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 {
	private:
		QTextCodec* _conv_with = nullptr;

	public:
		BytesAsString();

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

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

		// Serializable ==============================
		void loadFrom(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;
	};

	/// <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;
	};

	class BytesAsList : public ExtractUnit {
	private:
		std::shared_ptr<ExtractUnit> _bind_unit = nullptr;
		int _bytes_offset = 0;

		std::shared_ptr<SizeProvider> _bind_size_v = nullptr;

	public:
		bool setOffsetSpan(int value);
		std::shared_ptr<ExtractUnit> elementRule() const;
		bool setElementRule(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(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 RuleMatch {
	public:
		virtual std::shared_ptr<ExtractUnit> bindRule() const = 0;
		virtual bool checkpass() const = 0;
	};
	class BytesAsUnion : public AbstractExtractor {
	protected:
		std::shared_ptr<SizeProvider> _provider_ins = nullptr;

	public:
		bool setSizeProvider(std::shared_ptr<SizeProvider> ins);


		QVariant parse(const QByteArray& bytes) const override;


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

	};
}