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#ifndef INITFILE_H
#define INITFILE_H

#include <fstream>
#include <sstream>
#include <string>
#include <map>
#include <list>
#include <set>
#include <vector>
#include <stdexcept>
#include <iostream>
#include <typeinfo>
#include "FixVec.h"

#include <boost/algorithm/string/trim.hpp>
#include <boost/lexical_cast.hpp>

using namespace AMDiS;

namespace InitfileInternal {
	/// Exceptions
    struct WrongVectorSize : std::runtime_error {
		WrongVectorSize(std::string m):std::runtime_error(m) {}
	};
    struct NoDelim : std::runtime_error {
		NoDelim(std::string m):std::runtime_error(m) {}
	};
    struct WrongVectorFormat : std::runtime_error {
		WrongVectorFormat(std::string m):std::runtime_error(m) {}
	};
	template< typename T >
    struct WrongValueFormat : std::runtime_error {
		static std::string name(int ) { return "int"; }
		static std::string name(bool ) { return "bool"; }
		static std::string name(double ) { return "double"; }
		static std::string name(unsigned int ) { return "unsigned int"; }
		template< typename G >
		static std::string name(G ) { return std::string(typeid(G).name()); }
		
		WrongValueFormat(std::string value): std::runtime_error(std::string("cannot convert '") + value + std::string("' into <")+ name(T())+">" ) 
		{}

	};
	
	/// trim std::string
	inline std::string trim(const std::string& oldStr) {
		std::string swap(oldStr);
		boost::algorithm::trim(swap);
		return swap;
	}
	/// return the delimiter or throw an exception if there is no known delimiter in value
	size_t checkDelim(const std::string& value, const std::string& delims) {
		size_t pos(std::string::npos);
		for (unsigned i= 0; i<delims.length(); ++i) {
			pos= value.find(delims[i]);
			if (pos!=std::string::npos)
				return i;
		}
		throw NoDelim("cannot detect the delimiter in " + value);
		return 0; 
	}


	/** parse an container from tag tag. The Container must have the properties:
	 * 	- type value_type
	 * 	- member function push_back
	 */
	template< typename Container >
	inline void getContainer(const std::string val_, Container& c) {
		
		// accepted brackets and delimiters for vector input
		std::string begBrackets= "{[(";
		std::string endBrackets= "}])";
		std::string delims= ",;";

		c.clear();
		std::string val= trim(val_); 
		size_t pos= begBrackets.find(val[0]);
		if( pos == std::string::npos )
			throw WrongVectorFormat("cannot convert '" + val + "' into a list. No leading bracket found!");
		if( val[val.length() - 1] != endBrackets[pos] )
			throw WrongVectorFormat("begin and end bracket are different in value '" + val + "'");
		size_t oldPos= 1;
		size_t curDelim= 0;
		typedef typename Container::value_type ValueType;
		ValueType swap;
		try {
			curDelim= checkDelim(val, delims);
			pos= val.find(delims[curDelim], oldPos);
			while( pos != std::string::npos ) {
				std::string curWord= val.substr(oldPos, pos - 1);
				oldPos= pos + 1;
				convert(curWord, swap);
				c.push_back(swap);
				pos= val.find(delims[curDelim], oldPos);
			}
			//last entry
			std::string curWord= val.substr(oldPos, val.length() - oldPos-1);
			convert(curWord, swap);
			c.push_back(swap);
		} catch (NoDelim nd) {
			std::string curWord= val.substr(1, val.length()-2);
			curWord = trim(curWord);
			if(curWord.length()>0) {
			// container with one entry
				convert(curWord, swap);
				c.push_back(swap);
			}
		}
	}

	/// convert string to string
	inline void convert(const std::string valStr, std::string& value) {
		value= trim(valStr);
	}

	/// convert string to intrinsic type
	template< typename T >
	inline void convert(const std::string valStr, T& value) {
		using boost::lexical_cast;
		try {
			value = lexical_cast< T >(trim(valStr));
		}catch(boost::bad_lexical_cast e) {
			throw WrongValueFormat< T >(valStr);
		}
	}
	/// convert string to WorldVector
	template< typename T >
	inline void convert(const std::string valStr, WorldVector<T>& c) {
		std::vector<T> temp_vec;
		getContainer(valStr, temp_vec);
		if (static_cast<int>(temp_vec.size())!=c.getSize())
			throw WrongVectorSize("wrong number of entries for WorldVector");
		
		for (unsigned i= 0; i<temp_vec.size(); ++i)
			c[i]= temp_vec[i];
	}

	/// convert string to std::list using begBrackets, endBrackets and delims
	template< typename T >
	inline void convert(const std::string valStr, std::list< T >& value) {
		getContainer(valStr, value);
	}

	/// convert string to std::vector using begBrackets, endBrackets and delims
	template< typename T >
	inline void convert(const std::string valStr, std::vector< T >& value) {
		getContainer(valStr, value);
	}

	/// convert value of arbitrary type to string using stringstream and operator<< for type
	template< typename T >
	inline void convert(const T value, std::string& valStr) {
		std::stringstream ss;
		ss << value;
		valStr= ss.str();
	}
	/// convert WorldVector to string
	template< typename T >
	inline void convert(const WorldVector<T>& c, std::string& valStr) {
		std::vector<T> temp_vec(c.getSize());
		for (unsigned i= 0; i<temp_vec.size(); ++i)
			temp_vec[i]= c[i];
		convert(temp_vec, valStr);
	}
} // end namespace InitfileInternal

/** The entry in an initfile. This helper class was constructed to allow calls like
 *  val = data.get(tag)
 *  for arbitrary types of val. At current stage, only double and bool is supported
 */

struct InitEntry {
	///the value as string
	std::string valStr;

	/// initialize with value as string
	InitEntry(std::string v= ""):
		valStr(v) {}

	/// cast string to type T
	template< typename T >
	operator T() const { T t; convert(valStr, t); return t;}
};

/// output-stream for std::list
template< typename T >
std::ostream& operator<<(std::ostream& o, const std::list< T >& l) {
	typename std::list< T >::const_iterator it= l.begin();
	o << "[";
	for(unsigned i= 0; it!=l.end() && i<l.size(); ++i) {
		o << *it << (i<l.size()-1?", ":"");
		++it;
	}
	o << "]";
	return o;
}
/// output-stream for std::vector
template< typename T >
std::ostream& operator<<(std::ostream& o, const std::vector< T >& l) {
	typename std::vector< T >::const_iterator it= l.begin();
	o << "[";
	for(unsigned i= 0; it!=l.end() && i<l.size(); ++i) {
		o << *it << (i<l.size()-1?", ":"");
		++it;
	}
	o << "]";
	return o;
}

/** Basis data container as a map of tag on a value as strings. The container throws an exception, if the tag was not found.
 */
struct Initfile : public std::map< std::string, std::string > {
	typedef std::map< std::string, std::string > super;

	/// Exceptions
    struct TagNotFound : std::invalid_argument {
		TagNotFound(std::string m):std::invalid_argument(m) {}
	};
		
	/** initialize init-file from file with filename in, read data and save it to singleton-map
	 * @param in: filename string
	 */
	static void init(std::string in);
	
	/** Static get routine for getting parameter-values from init-file initialized in init()-method.
	 * Cast the value to the desired type using std::stringstream.
	 * @param tag: The tag to look for
	 * @param value: The result.
	 * @param debug_info: msgInfo for current parameter. (0..no printing, 1..print missing parameter info, 2..print parameter value) [optional]
	 */
	template< typename T >
	static void get(const std::string tag, T& value, int debug_info= -1) {
	using namespace InitfileInternal;
		initIntern();
		if (debug_info==-1)
			debug_info= singlett->getMsgInfo();
		
		try {
			std::string valStr(singlett->checkedGet(tag));
			valStr= trim(valStr);
			convert(valStr, value);
			if (debug_info==2)
				std::cout << "Parameter '" << tag << "' initialized with: " << value << std::endl;
		} catch (TagNotFound ia) {
			if (debug_info>=1)
				std::cout << ia.what() << std::endl;
		}
	}
	/// return InitEntry object for tag tag
	static InitEntry get(const std::string tag) {
	using namespace InitfileInternal;
		int debug_info= singlett->getMsgInfo();
		InitEntry result;
		try {
			std::string valStr(singlett->checkedGet(tag));
			valStr= trim(valStr);
			result= InitEntry(valStr);
		} catch (TagNotFound ia) {
			if (debug_info>=1)
				std::cout << ia.what() << std::endl;
		}
		return result;
	}
	
	/// update map tag->value_old to tag->value in singleton
	template< typename T >
	static void set(const std::string tag, T& value, int debug_info= -1) {
	using namespace InitfileInternal;
		initIntern();
		if (debug_info==-1)
			debug_info= singlett->getMsgInfo();
		
		std::string swap= "";
		convert(value, swap);
		(*singlett)[trim(tag)]= swap;
		// update msg parameters msgInfo, msgWait, paramInfo
		singlett->getInternalParameters();
		if (debug_info==2)
			std::cout << "Parameter '" << tag << "' set to: " << value << std::endl;
	}
	
	/// add map tag->value to data in singleton
	template< typename T >
	static void add(const std::string tag, T& value, int debug_info= -1) {
		set(tag, value, debug_info);
	}

	/// Returns specified info level
	static int getMsgInfo() 
	{ 
		return (singlett!=NULL) ? singlett->msgInfo : 0; 
	}

	/// Returns specified wait value
	static int getMsgWait() 
	{ 
		return (singlett!=NULL) ? singlett->msgWait : 0; 
	}
	
	/// Checks whether parameters are initialized. if not, call init()
	static bool initialized() 
	{ 
		return (singlett!=NULL); 
	}

	/// return pointer to singleton
	static Initfile *getSingleton() 
	{ 
		return singlett; 
	}
	
	/// print all data in singleton to std::cout
	static void printParameters();

	/// clear data in singleton
	static void clearData()
	{
		initIntern();
		singlett->clear();
	}
	
	/// save singlett-data to file with filename fn
	static void save(std::string fn)
	{
		initIntern();
		singlett->write(fn);
	}
	
protected:	
	Initfile() : msgInfo(10), msgWait(1), paramInfo(1) {}
	
	static void initIntern() {
		if (singlett == NULL)
			singlett= new Initfile;
	}

	/// list of processed files
	static std::set< std::string > fn_include_list;

	/// pointer to the singleton that contains the data
	static Initfile* singlett;
	
	/// return the value of the given tag or throws an exception if the tag does not exist
	std::string checkedGet(const std::string& tag) const {
		super::const_iterator it= find(tag);
		if (it==end())
			throw TagNotFound("there is no tag '"+ tag + "'");
		return it->second;
	}

	/** Fill the initfile from an input stream.
	* @param in: the stream to fill the data from.
	* Current dataformat: tag:value
	* Comment char: percent '%'
	* Include files: #include "filename" or #include <filename>
	*/
	void read(std::istream& in);

	/// Fill the initfile from a file with filename fn
	void read(std::string fn);
	
	/** Write data-map to initfile
	* @param out: the stream to fill the data in.
	*/
	void write(std::ostream& out);

	/// Write data-map to initfile with filename fn
	void write(std::string fn);
	
	/// read parameters for msgInfo, msgWait, paramInfo
	void getInternalParameters();
	
	int msgInfo, msgWait, paramInfo;
	
};
#endif