/**
 * UCS-2LE テスト
 *  @file DiffItem.h
 *
 *  @brief Declaration of DIFFITEM
 */
// ID line follows -- this is updated by SVN
// $Id: DiffItem.h 6095 2008-11-18 20:05:27Z kimmov $

#ifndef _DIFF_ITEM_H_
#define _DIFF_ITEM_H_

#include "ListEntry.h"
#include "DiffFileInfo.h"

/**
 * @brief Bitfield values for binary file sides.
 * These values are used as bitfield values when determining which file(s)
 * are binary files. There is no "both" -value since in bitfield "both" is
 * when side1- and side2- bits are set (BINFILE_SIDE1 | BINFILE_SIDE2).
 */
enum BINFILE_SIDE
{
	BINAFILE_NONE = 0, /**< No binary files detected. */
};

/**
 * @brief Status of one item comparison, stored as bitfields
 *
 * Bitmask can be seen as a 4 dimensional space; that is, there are four
 * different attributes, and each entry picks one of each attribute
 * independently
 *
 * One dimension is how the compare went: same or different or
 * skipped or error.
 *
 * One dimension is file mode: text or binary (text is only if
 * both sides were text)
 *
 * One dimension is existence: both sides, left only, or right only
 *
 * One dimension is type: directory, or file
 */
struct DIFFCODE
{
	/**
	 * @brief values for DIFFITEM.diffcode
	 */
	enum
	{
		// We use extra bits so that no valid values are 0
		// and each set of flags is in a different hex digit
		// to make debugging easier
		// These can always be packed down in the future
		TEXT2FLAGS=0x7, TEXT=0x1, BINSIDE1=0x2, BINSIDE2=0x3, BIN=0x4,
		TYPE2FLAGS=0x30, FILE=0x10, DIR=0x20,
		SIDEFLAGS=0x300, LEFT=0x100, RIGHT=0x200, BOTH=0x300,
		COMPAREFLAGS=0x7000, NOCMP=0x0000, SAME=0x1000, DIFF=0x2000, CMPERR=0x3000, CMPABORT=0x4000,
		FILTERFLAGS=0x30000, INCLUDED=0x10000, SKIPPED=0x20000,
		SCANFLAGS=0x100000, NEEDSCAN=0x100000,
	};

	UINT diffcode;

	DIFFCODE(UINT diffcode = 0) : diffcode(diffcode) { }

protected:
	/// Worker function, to check one area (mask) of code for a particular value (result)
	static bool Check(UINT code, int mask, int result) { return ((code & mask) == result); }
	/// Convenience function to check the part of the code for comparison results
	static bool CheckCompare(UINT code, int result) { return Check(code, DIFFCODE::COMPAREFLAGS, result); }
	/// Convenience function to check the part of the code for filter status
	static bool CheckFilter(UINT code, int result) { return Check(code, DIFFCODE::FILTERFLAGS, result); }
	/// Convenience function to check the part of the code for side status (eg, left-only)
	static bool CheckSide(UINT code, int result) { return Check(code, DIFFCODE::SIDEFLAGS, result); }

	/// Worker function to set the area indicated by mask to specified result
	void Set(int mask, UINT result) { diffcode &= (~mask); diffcode |= result; }
	/// Convenience function to set the side status, eg, SetSide(DIFFCODE::LEFT)
	void SetSide(UINT result) { Set(DIFFCODE::SIDEFLAGS, result); }
public:

	// file/directory
	bool IsDirectory() const { return Check(diffcode, DIFFCODE::TYPEFLAGS, DIFFCODE::DIR); }
	// left/right
	bool isSideLeftOnly() const { return CheckSide(diffcode, DIFFCODE::LEFT); }
	bool isSideLeftOrBoth() const { return isSideLeftOnly() || isSideBoth(); }
	void setSideLeft() { SetSide(DIFFCODE::LEFT); }
	bool isSideRightOnly() const { return CheckSide(diffcode, DIFFCODE::RIGHT); }
	bool isSideRightOrBoth() const { return isSideRightOnly() || isSideBoth(); }
	void setSideRight() { SetSide(DIFFCODE::RIGHT); }
	bool isSideBoth() const { return CheckSide(diffcode, DIFFCODE::BOTH); }
	void setSideBoth() { SetSide(DIFFCODE::BOTH); }
	void setSideNone() { SetSide(0); }
	// compare result
	bool isResultSame() const { return CheckCompare(diffcode, DIFFCODE::SAME); }
	bool isResultDiff() const { return (CheckCompare(diffcode, DIFFCODE::DIFF) && !isResultFiltered() &&
			!isSideLeftOnly() && !isSideRightOnly()); }
	static bool isResultError(UINT code) { return CheckCompare(code, DIFFCODE::CMPERR); }
	bool isResultError() const { return isResultError(diffcode); }
	static bool isResultAbort(UINT code) { return CheckCompare(code, DIFFCODE::CMPABORT); }
	bool isResultAbort() const { return isResultAbort(diffcode); }
	// filter status
	bool isResultFiltered() const { return CheckFilter(diffcode, DIFFCODE::SKIPPED); }
	// type
	bool isText() const { return Check(diffcode, DIFFCODE::TEXTFLAGS, DIFFCODE::TEXT); }
	void setText() { Set(DIFFCODE::TEXTFLAGS, DIFFCODE::TEXT); }
	bool isBin() const { return Check(diffcode, DIFFCODE::TEXTFLAGS, DIFFCODE::BIN) ||
			Check(diffcode, DIFFCODE::TEXTFLAGS, DIFFCODE::BINSIDE1) ||
			Check(diffcode, DIFFCODE::TEXTFLAGS, DIFFCODE::BINSIDE2); }
	void setBin() { Set(DIFFCODE::TEXTFLAGS, DIFFCODE::BIN); }
	// rescan
	bool isScanNeeded() const { return ((diffcode & DIFFCODE::SCANFLAGS) == DIFFCODE::NEEDSCAN); }

};

/**
 * @brief information about one file/folder item.
 * This class holds information about one compared item in the folder compare.
 * The item can be a file item or folder item. The item can have data from
 * both compare sides (file/folder exists in both sides) or just from one
 * side (file/folder exists only in other side).
 *
 * This class is for backend differences processing, presenting physical
 * files and folders. This class is not for GUI data like selection or
 * visibility statuses. So do not include any GUI-dependent data here. 
 */
struct DIFFITEM : ListEntry
{
	DIFFITEM *parent; /**< Parent of current item */
	ListEntry children; /**< Head of doubly linked list for chldren */

	DiffFileInfo left; /**< Fileinfo for left file */
	DiffFileInfo right; /**< Fileinfo for right file */
	int	nsdiffs; /**< Amount of non-ignored differences */
	int nidiffs; /**< Amount of ignored differences */
	String errorDesc; /**< technical note about error */
	UINT customFlags1; /**< Custom flags set 1 */
	DIFFCODE diffcode; /**< Compare result */

	static DIFFITEM emptyitem; /**< singleton to represent a diffitem that doesn't have any data */

	DIFFITEM() : parent(NULL), nidiffs(-1), nsdiffs(-1), customFlags1(0) { }
	~DIFFITEM();

	bool isEmpty() const { return this == &emptyitem; }
	String getLeftFilepath(const String &sLeftRoot) const;
	String getRightFilepath(const String &sRightRoot) const;
	int GetDepth() const;
	bool IsAncestor(const DIFFITEM *pdi) const;
	bool HasChildren() const;
};

#endif // _DIFF_ITEM_H_
