/** \file paramfilelist.c
 * Handling of the list of parameter files
 */

/*  XTrackCad - Model Railroad CAD
 *  Copyright (C) 2019 Martin Fischer
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */


#include "common.h"
#include "compound.h"
#include "ctrain.h"
#include "custom.h"
#include "dynstring.h"
#include "fileio.h"
#include "layout.h"
#include "paths.h"
#include "include/paramfile.h"
#include "include/paramfilelist.h"
#include "common-ui.h"


dynArr_t paramFileInfo_da;

int curParamFileIndex = PARAM_DEMO;

static int log_params;
static int log_paramupdate;

static char * customPath;
static char * customPathBak;

#define FAVORITESECTION "Parameter File Favorites"
#define FAVORITETOTALS "Total"
#define FAVORITEKEY "Favorite%d"
#define	FAVORITEDELETED "Deleted%d"

int GetParamFileCount()
{
	return (paramFileInfo_da.cnt);
}

/**
 * Show parameter file  error message
 *
 * \param [in,out] file If non-null, the file.
 */

static void
ReadParamError(char *file)
{
	DynString error_msg;
	DynStringMalloc(&error_msg, 100);
	DynStringPrintf(&error_msg,
	                _("The parameter file: %s could not be found and was probably deleted or moved. "
	                  "The file is removed from the active parameter file list."),
	                file);
	wNoticeEx(NT_ERROR, DynStringToCStr(&error_msg), "OK", NULL);
	DynStringFree(&error_msg);
}


/**
 * Update the configuration file in case the name of a parameter file has changed.
 * The function reads a list of new parameter filenames and gets the contents
 * description for each file. If that contents is in use, i.e. is a loaded parameter
 * file, the setting in the config file is updated to the new filename.
 * First line of update file has the date of the update file.
 * * Following lines have filenames, one per line.
 *
 * \return FALSE if update not possible or not necessary, TRUE if update successful
 */

static BOOL_T UpdateParamFiles(void)
{
	char fileName[STR_LONG_SIZE], *fileNameP;
//  const char * cp;
	FILE * updateF;
	long updateTime = -1;
	long lastTime;

	MakeFullpath(&fileNameP, libDir, "xtrkcad.upd", NULL);
	updateF = fopen(fileNameP, "r");
	free(fileNameP);
	if (updateF == NULL) {
		return FALSE;
	}
	wPrefGetInteger("file", "updatetime", &lastTime, 0);

	while ((fgets(fileName, STR_LONG_SIZE, updateF)) != NULL) {
		if ( fileName[0] == '#' ) {
			continue;
		}
		if ( updateTime == -1 ) {
			updateTime = atol(fileName);
			LOG1( log_paramupdate, ( "UpdateParamFiles Last: %ld, Update: %ld\n", lastTime,
			                         updateTime ) );
			if ( updateTime == 0 ) {
				NoticeMessage( "xtrkcad.upd : invalid Update Time", _("OK"), NULL );
				fclose(updateF);
				return FALSE;
			}
			if (lastTime >= updateTime) {
				fclose(updateF);
				return FALSE;
			}
			continue;
		}
		FILE * paramF;

		Stripcr(fileName);
		InfoMessage(_("Updating %s"), fileName);
		LOG1( log_paramupdate, ( "Updating %s\n", fileName ) );
		MakeFullpath(&fileNameP, libDir, "params", fileName, NULL);
		paramF = fopen(fileNameP, "r");
		if (paramF == NULL) {
			NoticeMessage(MSG_PRMFIL_OPEN_NEW, _("Ok"), NULL, fileNameP);
			free(fileNameP);
			continue;
		}
		char * newContents = NULL;
		char * oldContents = NULL;
		while ((fgets(message, sizeof message, paramF)) != NULL) {
			if (strncmp(message, "CONTENTS ", 9) == 0) {
				Stripcr(message);
				if ( newContents == NULL ) {
					// first CONTENTS
					newContents = MyStrdup(message + 9);
					// Get old CONTENTS->FILENAME mapping
					char * cp = wPrefGetString("Parameter File Map", newContents);
					if ( cp ) {
						LOG1( log_paramupdate, ( "ParmUpdate:  Upd CONTENTS %s (was %s) -> %s\n",
						                         newContents,
						                         cp?cp:"<>", fileNameP ) );
					} else {
						LOG1( log_paramupdate, ( "ParmUpdate:  New CONTENTS %s\n", newContents ) );
					}
					// Update CONTENTS->FILENAME mapping
					wPrefSetString("Parameter File Map", newContents, fileNameP);
				} else {
					// Subsequent old CONTENTS
					oldContents = message + 9;
					LOG1( log_paramupdate, ( "  Old CONTENTS %s\n", oldContents ) );
					// Check 'Parameter Files Names' map
					for (int fileNo = 1; ; fileNo++) {
						char fileNoS[4+9+1];
						sprintf(fileNoS, "File%d", fileNo);
						char * prevContents = wPrefGetString("Parameter File Names", fileNoS);
						if (prevContents == NULL || *prevContents == '\0') {
							// End of list
							break;
						}
						if ( strcmp( oldContents, prevContents ) == 0 ) {
							// Update contents index map
							LOG1( log_paramupdate, ( "ParamUpdate:  Found at %s -> %s\n", fileNoS,
							                         newContents ) );
							wPrefSetString( "Parameter File Names", fileNoS, newContents );
							break;
						}
					}
				}
			}
		}
		if ( newContents ) {
			MyFree( newContents );
		}
		fclose(paramF);
		if (newContents == NULL) {
			NoticeMessage(MSG_PRMFIL_NO_CONTENTS, _("Ok"), NULL, fileNameP);
		}

		free(fileNameP);
	}
	fclose(updateF);
	LOG1( log_paramupdate, ( "Param updatetime -> %d\n", updateTime ) );
	wPrefSetInteger("file", "updatetime", updateTime);
	return TRUE;
}

/**
 * Read the list of parameter files from configuration and load the files.
 *
 */
void LoadParamFileList(void)
{
	int fileNo;
	BOOL_T updated = FALSE;
	long *favoriteList = NULL;
	long favorites;
	int nextFavorite = 0;

	updated = UpdateParamFiles();

	wPrefGetIntegerBasic(FAVORITESECTION, FAVORITETOTALS, &favorites, 0);
	if (favorites) {
		DynString topic;
		favoriteList = MyMalloc(sizeof(long)*favorites);

		DynStringMalloc(&topic, 16);
		for (int i = 0; i < favorites; i++) {
			DynStringPrintf(&topic, FAVORITEKEY, i);
			wPrefGetIntegerBasic(FAVORITESECTION, DynStringToCStr(&topic), &favoriteList[i],
			                     0);
		}
		DynStringFree(&topic);
	}

	for (fileNo = 1; ; fileNo++) {
		char *fileName;
		const char * contents;
//      enum paramFileState structState = PARAMFILE_UNLOADED;


		sprintf(message, "File%d", fileNo);
		contents = wPrefGetString("Parameter File Names", message);
		if (contents == NULL || *contents == '\0') {
			break;
		}
		InfoMessage("Parameters for %s", contents);
		fileName = wPrefGetString("Parameter File Map", contents);
		if (fileName == NULL || *fileName == '\0') {
			NoticeMessage(MSG_PRMFIL_NO_MAP, _("Ok"), NULL, contents);
			continue;
		}
		char * share;

		// Rewire to the latest system level
#define SHAREPARAMS (PATH_SEPARATOR "share" PATH_SEPARATOR "xtrkcad" PATH_SEPARATOR "params" PATH_SEPARATOR)
#define SHAREBETAPARAMS (PATH_SEPARATOR "share" PATH_SEPARATOR "xtrkcad-beta" PATH_SEPARATOR "params" PATH_SEPARATOR)
		if ((share= strstr(fileName,SHAREPARAMS))) {
			share += strlen(SHAREPARAMS);
		}
#ifndef WINDOWS
#ifndef __APPLE__
		if ( share == NULL &&
		     (share= strstr(fileName,SHAREBETAPARAMS))) {
			share += strlen(SHAREBETAPARAMS);
		}
#endif
#endif
		if ( share ) {
			MakeFullpath(&fileName, wGetAppLibDir(), "params", share, NULL);
			LOG1( log_paramupdate, ( "Param LoadParamList: %s -> %s\n", contents,
			                         fileName ) );
			wPrefSetString("Parameter File Map", contents, fileName);
		}

		if (ReadParamFile(fileName) >= 0) {

			if (curContents == NULL) {
				curContents = curSubContents = MyStrdup(contents);
			}
			paramFileInfo(curParamFileIndex).contents = curContents;
			if (favoriteList && fileNo == favoriteList[nextFavorite]) {
				DynString topic;
				long deleted;
				DynStringMalloc(&topic, 16);
				DynStringPrintf(&topic, FAVORITEDELETED, fileNo);

				wPrefGetIntegerBasic(FAVORITESECTION, DynStringToCStr(&topic), &deleted, 0L);
				paramFileInfo(curParamFileIndex).favorite = TRUE;
				paramFileInfo(curParamFileIndex).deleted = deleted;
				if (nextFavorite < favorites - 1) {
					nextFavorite++;
				}
				DynStringFree(&topic);
			}
		} else {
			ReadParamError(fileName);
		}
	}
	curParamFileIndex = PARAM_CUSTOM;
	if (updated) {
		SaveParamFileList();
	}

	MyFree(favoriteList);
}

/**
 * Save the currently selected parameter files. Parameter files that have been unloaded
 * are not saved.
 *
 */

void SaveParamFileList(void)
{
	int fileInx;
	int fileNo;
	int favorites;
	char * contents, *cp;

	for (fileInx = 0, fileNo = 1, favorites = 0; fileInx < paramFileInfo_da.cnt;
	     fileInx++) {
		if (paramFileInfo(fileInx).valid && (!paramFileInfo(fileInx).deleted ||
		                                     paramFileInfo(fileInx).favorite)) {
			sprintf(message, "File%d", fileNo);
			contents = paramFileInfo(fileInx).contents;
			for (cp = contents; *cp; cp++) {
				if (*cp == '=' || *cp == '\'' || *cp == '"' || *cp == ':' || *cp == '.') {
					*cp = ' ';
				}
			}
			LOG1( log_paramupdate, ( "Param SaveFileList:  %s -> %s\n", message,
			                         contents ) );
			wPrefSetString("Parameter File Names", message, contents);
			LOG1( log_paramupdate, ( "Param                %s -> %s\n", contents,
			                         paramFileInfo(fileInx).name ) );
			wPrefSetString("Parameter File Map", contents, paramFileInfo(fileInx).name);
			if (paramFileInfo(fileInx).favorite) {
				sprintf(message, FAVORITEKEY, favorites);
				LOG1( log_paramupdate, ( "Param Favorite                %s -> %d\n", message,
				                         fileNo ) );
				wPrefSetInteger(FAVORITESECTION, message, fileNo);
				sprintf(message, FAVORITEDELETED, fileNo);
				LOG1( log_paramupdate, ( "Param                        %s -> %d\n", message,
				                         paramFileInfo(fileInx).deleted ) );
				wPrefSetInteger(FAVORITESECTION, message, paramFileInfo(fileInx).deleted);
				favorites++;
			}
			fileNo++;
		}
	}
	sprintf(message, "File%d", fileNo);
	LOG1( log_paramupdate, ( "Param SaveFileList:  %s -> <>\n", message ) );
	wPrefSetString("Parameter File Names", message, "");
	LOG1( log_paramupdate, ( "Param Favorite       %s -> %d\n", FAVORITETOTALS,
	                         favorites ) );
	wPrefSetInteger(FAVORITESECTION, FAVORITETOTALS, favorites);
}

void
UpdateParamFileList(void)
{
	for (size_t i = 0; i < (unsigned)paramFileInfo_da.cnt; i++) {
		SetParamFileState((int)i);
	}
}



/**
 * Load the selected parameter files. This is a callback executed when the file selection dialog
 * is closed.
 * Steps:
 * - the parameters are read from file
 * - check is performed to see whether the content is already present, if yes the previously
 * loaded content is invalidated
 * - loaded parameter file is added to list of parameter files
 * - if a parameter file dialog exists the list is updated. It is either rewritten in
 * in case of an invalidated file or the new file is appended
 * - the settings are updated
 * These steps are repeated for every file in list
 *
 * \param files IN the number of filenames in the fileName array
 * \param fileName IN an array of fully qualified filenames
 * \param data IN ignored
 * \return  TRUE on success, FALSE on error
 */

int LoadParamFile(
        int files,
        char ** fileName,
        void * data)
{
	wIndex_t inx;
	int i = 0;

	CHECK(fileName != NULL);
	CHECK(files > 0);

	for (i = 0; i < files; i++) {
//      enum paramFileState structState = PARAMFILE_UNLOADED;
		int newIndex;

		curContents = curSubContents = NULL;

		newIndex = ReadParamFile(fileName[i]);
		if (newIndex >= 0) {
			// in case the contents is already present, make invalid
			for (inx = 0; inx < newIndex; inx++) {
				if (paramFileInfo(inx).valid &&
				    strcmp(paramFileInfo(inx).contents, curContents) == 0) {
					paramFileInfo(inx).valid = FALSE;
					break;
				}
			}

			LOG1( log_paramupdate, ( "Param Load: %s -> %s\n", curContents,
			                         paramFileInfo(curParamFileIndex).name) );
			wPrefSetString("Parameter File Map", curContents,
			               paramFileInfo(curParamFileIndex).name);
		} else {
			ReadParamError(fileName[i]);
		}
	}
	//Only set the ParamFileDir if not the system directory
	if ( (!strstr(fileName[i-1],SHAREPARAMS))
#ifndef WINDOWS
#ifndef __APPLE__
	     && (!strstr(fileName[i-1],SHAREBETAPARAMS))
#endif
#endif
	   ) {
		SetParamFileDir(fileName[i - 1]);
	}
	curParamFileIndex = PARAM_CUSTOM;
	DoChangeNotification(CHANGE_PARAMS);
	return TRUE;
}

static void ReadCustom(void)
{
	FILE * f;
	MakeFullpath(&customPath, workingDir, sCustomF, NULL);
	customPathBak = MyStrdup(customPath);
	customPathBak[ strlen(customPathBak)-1 ] = '1';
	f = fopen(customPath, "r");
	if (f != NULL) {
		fclose(f);
		curParamFileIndex = PARAM_CUSTOM;
		ReadParams(0, workingDir, sCustomF);
	}
}


/**
 * Open the custom file where user-defined turnouts, cars and such are stored
 */

FILE * OpenCustom(char *mode)
{
	FILE * ret = NULL;

	if (inPlayback) {
		return NULL;
	}
	if (*mode == 'w') {
		rename(customPath, customPathBak);
	}
	if (customPath) {
		ret = fopen(customPath, mode);
		if (ret == NULL) {
			NoticeMessage(MSG_OPEN_FAIL, _("Continue"), NULL, _("Custom"), customPath,
			              strerror(errno));
		}
	}

	return ret;
}
/**
 * Update and open the parameter files dialog box
 *
 * \param junk
 */

static void DoParamFileListDialog(void *junk)
{
	DoParamFiles(junk);
	ParamFileListLoad(paramFileInfo_da.cnt, &paramFileInfo_da);

}

addButtonCallBack_t ParamFilesInit(void)
{
	RegisterChangeNotification(ParamFilesChange);
	return &DoParamFileListDialog;
}

/**
 * Get the initial parameter files. The Xtrkcad.xtq file containing scale and
 * demo definitions is read.
 *
 * \return FALSE on error, TRUE otherwise
 */
BOOL_T ParamFileListInit(void)
{
	/** @logcmd @showrefby params=n paramfilelist.c Log ReadParams
	 * (including scale file (xtq), custom file (*.cus) and other params (xtp))
	 */
	log_params = LogFindIndex("params");
	log_paramupdate = LogFindIndex("paramupdate");

	SetCLocale();
	// get the default definitions
	if (ReadParams(lParamKey, libDir, sParamQF) == FALSE) {
		SetUserLocale();
		return FALSE;
	}

	curParamFileIndex = PARAM_CUSTOM;

	if (lParamKey == 0) {
		LoadParamFileList();
		ReadCustom();
	}

	SetUserLocale();
	return TRUE;

}

/**
 * Deletes all parameter types described by index
 *
 * \param  index Zero-based index of the.
 */

static void
DeleteAllParamTypes(int index)
{

	DeleteTurnoutParams(index);
	DeleteCarProto(index);
	DeleteCarPart(index);
	DeleteStructures(index);
}


/**
 * Unload parameter file: all parameter definitions from this file are deleted
 * from memory. Strings allocated to store the filename and contents
 * description are free'd as well.
 * In order to keep the overall data structures consistent, the file info
 * structure is not removed from the array but flagged as garbage
 *
 * \param  fileIndex Zero-based index of the file.
 *
 * \returns True if it succeeds, false if it fails.
 */

bool
UnloadParamFile(wIndex_t fileIndex)
{
	paramFileInfo_p paramFileI = &paramFileInfo(fileIndex);

	DeleteAllParamTypes(fileIndex);

	MyFree(paramFileI->name);
	MyFree(paramFileI->contents);

	paramFileI->valid = FALSE;

	for (int i = 0; i < paramFileInfo_da.cnt; i++) {
		LOG1(log_params, ("UnloadParamFiles: = %s: %d\n", paramFileInfo(i).contents,
		                  paramFileInfo(i).trackState))
	}

	return (true);
}

/**
 * Reload parameter file
 *
 * \param  index Zero-based index of the paramFileInfo struct.
 *
 * \returns True if it succeeds, false if it fails.
 */

bool
ReloadParamFile(wIndex_t index)
{
	paramFileInfo_p paramFileI = &paramFileInfo(index);

	DeleteAllParamTypes(index);
	MyFree(paramFileI->contents);

	ReloadDeletedParamFile(index);

	return(true);
}