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/*
 *
 *	Compact JSON format parsing lib (native cross-platform c++)
 *
 *	Copyright (C) 2013 Victor Laskin (victor.laskin@gmail.com)
 *	Details: http://vitiy.info/?p=102
 *
 *	Redistribution and use in source and binary forms, with or without
 *	modification, are permitted provided that the following conditions
 *	are met:
 *	1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  3. The names of the authors may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.
 *
 *	THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
 *	OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *	WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *	ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
 *	DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *	DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 *	GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
 *	IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 *	OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 *	IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */


#include <string>
#include <vector>
#include <stdlib.h>

#ifndef MVJSON_H_
#define MVJSON_H_

using namespace std;

namespace JSON {

/// JSON node types
enum MVJSON_TYPE
{
	MVJSON_TYPE_NULL,
	MVJSON_TYPE_OBJECT,
	MVJSON_TYPE_ARRAY,
	MVJSON_TYPE_STRING,
	MVJSON_TYPE_INT,
	MVJSON_TYPE_DOUBLE,
	MVJSON_TYPE_BOOL
};

class MVJSONUtils {
protected:

	// string parsing functions
	inline static int stringToInt(const string & s);											///< convert string to int
	inline static double stringToDouble(const string & s);										///< convert string to float
	inline static bool symbolToBeTrimmed(const char& c);										///< check if symbol is space, tab or new line break
	inline static string trim(const string & text);												///< trim spaces, tabs and line break
	inline static void replace(string & target, const string & oldStr, const string & newStr);  ///< replace all occurrences of substring
	inline static void splitInHalf(const string & s, const string & separator, string & begin, string & end);	///< second half (output)
	inline static void splitList(const string & s,  vector<string> & parts);
};


class MVJSONNode;

/// JSON Value
class MVJSONValue : public MVJSONUtils {
public:
	MVJSONValue(string name, MVJSON_TYPE valueType);
	MVJSONValue(string name, bool value);
	MVJSONValue(string name, string value);
	MVJSONValue(string name, int value);
	MVJSONValue(string name, double value);
	MVJSONValue(string name, MVJSONNode* value);
	virtual ~MVJSONValue();

	string name;							///< value name [optional]
	MVJSON_TYPE valueType;					///< type of node

	string stringValue;						///< value if data has string type
	bool boolValue;							///< value if data has bool type
	int intValue;							///< value if data has int type
	double doubleValue;						///< value if data has double type
	MVJSONNode* objValue;					///< value if data has object type

	vector<MVJSONValue*> arrayValue;		///< array of values

	double getFieldDouble(string name);		///< get value of double field of VALUE OBJECT (objValue)
	int getFieldInt(string name);			///< get value of int field of VALUE OBJECT (objValue)
	string getFieldString(string name);		///< get value of string field of VALUE OBJECT (objValue)
	bool getFieldBool(string name);			///< get value of bool field of VALUE OBJECT (objValue)

	inline MVJSONValue* at(unsigned int i){ return arrayValue.at(i); }
	inline int size() { if (valueType == MVJSON_TYPE_ARRAY) return arrayValue.size(); else return 1; }
private:
	void init(MVJSON_TYPE valueType);
};

/// JSON Node (Object)
class MVJSONNode {
public:

	virtual ~MVJSONNode();

	vector<MVJSONValue*> values; 			///< values (props)

	bool hasField(string name);				///< check that object has field
	MVJSONValue* getField(string name);		///< get field by name

	double getFieldDouble(string name);		///< get value of double field
	int getFieldInt(string name);			///< get value of int field
	string getFieldString(string name);		///< get value of string field
	bool getFieldBool(string name);			///< get value of bool field
};

/// Compact JSON parser (based on specification: http://www.json.org/)
class MVJSONReader : public MVJSONUtils {
public:
	MVJSONReader(const string & source);	///< constructor from json source
	virtual ~MVJSONReader();

	MVJSONNode* root;						///< root object (if its null - parsing was failed)

private:
	MVJSONValue* parseValue(string text, bool hasNoName);					///< parse value
	MVJSONNode* parse(string text);											///< parse node


};



// ------------------- inlined string processing functions ------------->


inline int MVJSONUtils::stringToInt(const string & s)
{
	return atoi(s.c_str());
}


inline double MVJSONUtils::stringToDouble(const string & s)
{
	return atof(s.c_str());
}


inline bool MVJSONUtils::symbolToBeTrimmed(const char& c   ///< the char to test
)
{
	if (c == ' ') return true;
	if (c == '\n') return true;
	if (c == '\r') return true;
	if (c == '\t') return true;
	return false;
}


inline string  MVJSONUtils::trim(const string & text  ///< the text to trim
)
{
	if (text.length() == 0) return "";
	int start = 0;
	while ((start < text.length()) && (symbolToBeTrimmed(text[start]))) start++;
	int end = text.length() - 1;
	while ((end > 0) && (symbolToBeTrimmed(text[end]))) end--;
	if (start > end) return "";

	return text.substr(start, end - start + 1);
}

inline void MVJSONUtils::splitInHalf(const string & s,						///< source string to split up
									  const string & separator,				///< separator string)
									  string & begin,						///< first part (output)
									  string & end							///< second half (output)
)
{
	int pos = s.find(separator);
	if (pos == string::npos) { begin = s; end = ""; return; }

	begin = s.substr(0, pos);
	end = s.substr(pos + separator.length(), s.length() - pos - separator.length());
}

/// split string by "," - ignore content inside of "{", "}", "[", "]" and quotations "...."
/// also take \" into account
/// (Code should be cleared of comments beforehand)
inline void MVJSONUtils::splitList(const string & s,				///< string to be splitted
									vector<string> & parts			///< result parts
)
{

	bool isNotInQuotes = true;
	int b1 = 0;
	int b2 = 0;
	int lastPos = 0;

	const char* start = s.c_str();
	const char* ps = start;

	while (*ps) // *ps != 0
	{
		if ((*ps == ',') && (isNotInQuotes) && (b1 == 0) && (b2 == 0))
		{
			parts.push_back(s.substr(lastPos, ps - start - lastPos));
			lastPos = ps - start + 1;
		}

		if (isNotInQuotes)
		{
			if (*ps == '{') b1++;
			if (*ps == '}') b1--;
			if (*ps == '[') b2++;
			if (*ps == ']') b2--;
		}

		if (*ps == '"')
		{
			isNotInQuotes = !isNotInQuotes;
			if (ps != start)
				if (*(ps-1) == '\\')
					isNotInQuotes = !isNotInQuotes;
		}

		ps++;
	}

	parts.push_back(s.substr(lastPos, s.length() - lastPos));
}

inline void MVJSONUtils::replace(string & target,			///< text to be modified
								  const string & oldStr,		///< old string
								  const string & newStr		///< new string
)
{
	unsigned int pos = 0;
	unsigned int oldLen = oldStr.length();
	unsigned int newLen = newStr.length();

	for (;;)
	{
		pos = target.find(oldStr, pos);
		if (pos == string::npos) break;
		target.replace(pos, oldLen, newStr);
		pos += newLen;
	}
}


} /* namespace F2 */
#endif /* MVJSON_H_ */