#pragma once
#include "core/math/color.h"

enum KeyValuesTypes_t : char
{
	TYPE_NONE = 0x0,
	TYPE_STRING = 0x1,
	TYPE_INT = 0x2,
	TYPE_FLOAT = 0x3,
	TYPE_PTR = 0x4,
	TYPE_WSTRING = 0x5,
	TYPE_COLOR = 0x6,
	TYPE_UINT64 = 0x7,
	TYPE_COMPILED_INT_BYTE = 0x8,
	TYPE_COMPILED_INT_0 = 0x9,
	TYPE_COMPILED_INT_1 = 0xA,
	TYPE_NUMTYPES = 0xB,
};

enum MergeKeyValuesOp_t
{
	MERGE_KV_ALL,
	MERGE_KV_UPDATE, // update values are copied into storage, adding new keys to storage or updating existing ones
	MERGE_KV_DELETE, // update values specify keys that get deleted from storage
	MERGE_KV_BORROW, // update values only update existing keys in storage, keys in update that do not exist in storage are discarded
};

//-----------------------------------------------------------------------------
// Purpose: Simple recursive data access class
//			Used in vgui for message parameters and resource files
//			Destructor deletes all child KeyValues nodes
//			Data is stored in key (string names) - (string/int/float)value pairs called nodes.
//
//	About KeyValues Text File Format:

//	It has 3 control characters '{', '}' and '"'. Names and values may be quoted or
//	not. The quote '"' character must not be used within name or values, only for
//	quoting whole tokens. You may use escape sequences wile parsing and add within a
//	quoted token a \" to add quotes within your name or token. When using Escape
//	Sequence the parser must now that by setting KeyValues::UsesEscapeSequences( true ),
//	which it's off by default. Non-quoted tokens ends with a whitespace, '{', '}' and '"'.
//	So you may use '{' and '}' within quoted tokens, but not for non-quoted tokens.
//  An open bracket '{' after a key name indicates a list of subkeys which is finished
//  with a closing bracket '}'. Subkeys use the same definitions recursively.
//  Whitespaces are space, return, newline and tabulator. Allowed Escape sequences
//	are \n, \t, \\, \n and \". The number character '#' is used for macro purposes
//	(eg #include), don't use it as first character in key names.
//-----------------------------------------------------------------------------
class KeyValues
{
  private:
	KeyValues(); // for internal use only

  public:
	// Constructors/destructors
	KeyValues(const char* pszSetName);
	KeyValues(const char* pszSetName, const char* pszFirstKey, const char* pszFirstValue);
	KeyValues(const char* pszSetName, const char* pszFirstKey, const wchar_t* pwszFirstValue);
	KeyValues(const char* pszSetName, const char* pszFirstKey, int iFirstValue);
	KeyValues(
		const char* pszSetName, const char* pszFirstKey, const char* pszFirstValue, const char* pszSecondKey, const char* pszSecondValue);
	KeyValues(const char* pszSetName, const char* pszFirstKey, int iFirstValue, const char* pszSecondKey, int iSecondValue);
	~KeyValues(void);

	void Init(void);
	void Clear(void);
	void DeleteThis(void);
	void RemoveEverything();

	KeyValues* FindKey(const char* pKeyName, bool bCreate = false);
	KeyValues* FindLastSubKey(void) const;

	void AddSubKey(KeyValues* pSubkey);
	void RemoveSubKey(KeyValues* pSubKey);
	void InsertSubKey(int nIndex, KeyValues* pSubKey);
	bool ContainsSubKey(KeyValues* pSubKey);
	void SwapSubKey(KeyValues* pExistingSubkey, KeyValues* pNewSubKey);
	void ElideSubKey(KeyValues* pSubKey);

	// Data access
	bool IsEmpty(const char* pszKeyName);
	KeyValues* GetFirstTrueSubKey(void) const;
	KeyValues* GetNextTrueSubKey(void) const;
	KeyValues* GetFirstValue(void) const;
	KeyValues* GetNextValue(void) const;
	KeyValues* GetFirstSubKey() const;
	KeyValues* GetNextKey() const;
	const char* GetName(void) const;
	int GetInt(const char* pszKeyName, int iDefaultValue);
	uint64_t GetUint64(const char* pszKeyName, uint64_t nDefaultValue);
	void* GetPtr(const char* pszKeyName, void* pDefaultValue);
	float GetFloat(const char* pszKeyName, float flDefaultValue);
	const char* GetString(const char* pszKeyName = nullptr, const char* pszDefaultValue = "");
	const wchar_t* GetWString(const char* pszKeyName = nullptr, const wchar_t* pwszDefaultValue = L"");
	Color GetColor(const char* pszKeyName, const Color& defaultColor);
	KeyValuesTypes_t GetDataType(const char* pszKeyName);
	KeyValuesTypes_t GetDataType(void) const;

	// Key writing
	void SetInt(const char* pszKeyName, int iValue);
	void SetUint64(const char* pszKeyName, uint64_t nValue);
	void SetPtr(const char* pszKeyName, void* pValue);
	void SetNextKey(KeyValues* pDat);
	void SetName(const char* pszName);
	void SetString(const char* pszKeyName, const char* pszValue);
	void SetWString(const char* pszKeyName, const wchar_t* pwszValue);
	void SetStringValue(char const* pszValue);
	void SetColor(const char* pszKeyName, Color color);
	void SetFloat(const char* pszKeyName, float flValue);

	void RecursiveCopyKeyValues(KeyValues& src);
	void CopySubkeys(KeyValues* pParent) const;
	KeyValues* MakeCopy(void) const;

  public:
	uint32_t m_iKeyName : 24; // 0x0000
	uint32_t m_iKeyNameCaseSensitive1 : 8; // 0x0003
	char* m_sValue; // 0x0008
	wchar_t* m_wsValue; // 0x0010
	union // 0x0018
	{
		int m_iValue;
		float m_flValue;
		void* m_pValue;
		unsigned char m_Color[4];
	};
	char m_szShortName[8]; // 0x0020
	char m_iDataType; // 0x0028
	char m_bHasEscapeSequences; // 0x0029
	uint16_t m_iKeyNameCaseSensitive2; // 0x002A
	KeyValues* m_pPeer; // 0x0030
	KeyValues* m_pSub; // 0x0038
	KeyValues* m_pChain; // 0x0040
};
