#pragma once
#include <map>
#include <string>

using std::map;

#ifndef stdstring
#	ifdef UNICODE
#		define stdstring std::wstring
#	else
#		define stdstring std::string
#	endif
#endif

/**
 *
 * A helper class for parsing command lines.
 * It provides methods to extract 'key' and 'value'
 * pairs of the form -keyname:value or /keyname:value.
 * Parameter examples:\n
 * \code
 * "/key1 /key2:myvalue -key3:anothervalue -key4:"this could be a path with spaces"
 * \endcode
 * /key is the same as -key\n
 * all keys and values are case-insensitive.
 * Please note that both keys and values are strings although the class
 * provides a method to get a long as a value.
 * Example:\n
 * \code
 * CCmdLineParser parser(::GetCommandLine());
 * if (parser.HasKey("r"))
 * {
 * 	// the key -r or /r is there (could mean e.g. 'recurse')
 * }
 * //now assume the command line is /open:"c:\test.txt" /wait:30
 * CString file = parser.GetVal("open");
 * //file contains now c:\test.txt
 * long number = parser.GetLongVal("seconds");
 * //number has now the value 30
 * \endcode
 */
class CCmdLineParser 
{
public:
	typedef map<stdstring, stdstring> CValsMap;
	typedef CValsMap::const_iterator ITERPOS;
public:
	/**
	 * Creates a CCmdLineParser object and parses the parameters in.
	 * \param sCmdLine the command line
	 */
	CCmdLineParser(LPCTSTR sCmdLine = NULL);
	virtual ~CCmdLineParser();

	/**
	 * returns the command line string this object was created on.
	 * \return the command line
	 */
	LPCTSTR getCmdLine() const { return m_sCmdLine.c_str(); }

	/**
	 * Starts an iteration over all command line parameters.
	 * \return the first position
	 */
	ITERPOS begin() const;	

	/**
	 * Get the next key/value pair. If no more keys are available then
	 * an empty key is returned.
	 * \param the position from where to get. To get the first pair use the
	 * begin() method. \a pos is incremented by 1 on return.
	 * \param sKey returns the key
	 * \param sValue returns the value
	 * \return the next position
	 */
	ITERPOS getNext(ITERPOS& pos, stdstring& sKey, stdstring& sValue) const;
		
	/**
	 * Checks if the position is the last or if there are more key/value pairs in the command line.
	 * \param pos the position to check
	 * \return TRUE if no more key/value pairs are available
	 */
	BOOL isLast(const ITERPOS& pos) const;

	/**
	 * Checks if the given key is in the command line.
	 * \param sKey the key to check for
	 * \return TRUE if the key exists, FALSE if the key is not in command line
	 */
	BOOL HasKey(LPCTSTR sKey) const;

	/**
	 * Checks if a key also has a value or not.
	 * \param sKey the key to check for a value
	 * \return TRUE if the key has a value, FALSE if no value (or no key) was found
	 */
	BOOL HasVal(LPCTSTR sKey) const;

	/**
	 * Reads the value for a key. If the key has no value then NULL is returned.
	 * \param sKey the key to get the value from
	 * \return the value string of the key
	 */
	LPCTSTR GetVal(LPCTSTR sKey) const;
	
	/**
	 * Reads the value for a key as a long. If the value is a string which can't be
	 * converted to a number then 0 is returned.
	 * \param the key to get the value from
	 * \return the value converted to a long
	 */
	LONG GetLongVal(LPCTSTR sKey) const;

private:
	BOOL Parse(LPCTSTR sCmdLine);
	CValsMap::const_iterator findKey(LPCTSTR sKey) const;
	const CValsMap& getVals() const { return m_valueMap; }
private:
	stdstring 	m_sCmdLine;
	CValsMap	m_valueMap;

	static const TCHAR m_sDelims[];
	static const TCHAR m_sValueSep[];
	static const TCHAR m_sQuotes[];
};