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/* $Id$ */

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#include "stdafx.h"

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#include "openttd.h"

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#include "functions.h"

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#include "macros.h"

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#include "debug.h"

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#include "variables.h"

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#include "saveload.h"

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#include "md5.h"

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#include "newgrf.h"

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#include "newgrf_config.h"

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#include "fileio.h"

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#include "fios.h"

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#include <sys/types.h>

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#include <sys/stat.h>

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#ifdef WIN32

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# include <io.h>

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#else

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# include <unistd.h>

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# include <dirent.h>

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#endif /* WIN32 */

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GRFConfig *_all_grfs;

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GRFConfig *_grfconfig;

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GRFConfig *_grfconfig_newgame;

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/* Calculate the MD5 Sum for a GRF */

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static bool CalcGRFMD5Sum(GRFConfig *config)

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{

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	FILE *f;

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	char filename[MAX_PATH];

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	md5_state_t md5state;

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	md5_byte_t buffer[1024];

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	size_t len;

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	/* open the file */

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	snprintf(filename, lengthof(filename), "%s%s", _path.data_dir, config->filename);

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	f = fopen(filename, "rb");

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	if (f == NULL) return false;

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	/* calculate md5sum */

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	md5_init(&md5state);

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	while ((len = fread(buffer, 1, sizeof(buffer), f)) != 0) {

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		md5_append(&md5state, buffer, len);

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	}

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	md5_finish(&md5state, config->md5sum);

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	fclose(f);

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	return true;

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}

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/* Find the GRFID and calculate the md5sum */

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bool FillGRFDetails(GRFConfig *config)

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{

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	if (!FioCheckFileExists(config->filename)) {

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		SETBIT(config->flags, GCF_NOT_FOUND);

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		return false;

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	}

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	/* Find and load the Action 8 information */

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	/* 62 is the last file slot before sample.cat.

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	 * Should perhaps be some "don't care" value */

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	LoadNewGRFFile(config, 62, GLS_FILESCAN);

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	/* Skip if the grfid is 0 (not read) or 0xFFFFFFFF (ttdp system grf) */

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	if (config->grfid == 0 || config->grfid == 0xFFFFFFFF) return false;

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	return CalcGRFMD5Sum(config);

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}

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/* Clear a GRF Config list */

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void ClearGRFConfigList(GRFConfig *config)

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{

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	GRFConfig *c, *next;

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	for (c = config; c != NULL; c = next) {

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		next = c->next;

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		free(c->filename);

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		free(c->name);

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		free(c->info);

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		free(c);

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	}

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}

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/* Copy a GRF Config list */

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static void CopyGRFConfigList(GRFConfig **dst, GRFConfig *src)

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{

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	GRFConfig *c;

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	for (; src != NULL; src = src->next) {

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		c = calloc(1, sizeof(*c));

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		*c = *src;

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		c->filename = strdup(src->filename);

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		if (src->name != NULL) c->name = strdup(src->name);

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		if (src->info != NULL) c->info = strdup(src->info);

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		*dst = c;

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		dst = &c->next;

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	}

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}

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/* Reset the current GRF Config to either blank or newgame settings */

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void ResetGRFConfig(bool defaults)

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{

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	ClearGRFConfigList(_grfconfig);

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	_grfconfig = NULL;

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	if (defaults) CopyGRFConfigList(&_grfconfig, _grfconfig_newgame);

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}

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/* Check if all GRFs in the GRF Config can be loaded */

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bool IsGoodGRFConfigList(void)

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{

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	bool res = true;

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	GRFConfig *c;

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	for (c = _grfconfig; c != NULL; c = c->next) {

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		const GRFConfig *f = FindGRFConfig(c->grfid, c->md5sum);

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		if (f == NULL) {

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			char buf[512], *p = buf;

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			uint i;

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			p += snprintf(p, lastof(buf) - p, "Couldn't find NewGRF %08X (%s) checksum ", BSWAP32(c->grfid), c->filename);

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			for (i = 0; i < lengthof(c->md5sum); i++) {

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				p += snprintf(p, lastof(buf) - p, "%02X", c->md5sum[i]);

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			}

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			ShowInfo(buf);

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			res = false;

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		} else {

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			DEBUG(grf, 1) ("[GRF] Loading GRF %X from %s", BSWAP32(c->grfid), f->filename);

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			c->filename = strdup(f->filename);

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			c->name     = strdup(f->name);

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			c->info     = strdup(f->info);

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		}

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	}

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	return res;

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}

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extern bool FiosIsValidFile(const char *path, const struct dirent *ent, struct stat *sb);

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/* Scan a path for NewGRFs */

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static uint ScanPath(const char *path)

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{

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	uint num = 0;

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	struct stat sb;

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	struct dirent *dirent;

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	DIR *dir;

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	GRFConfig *c;

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	if ((dir = opendir(path)) == NULL) return 0;

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	while ((dirent = readdir(dir)) != NULL) {

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		const char *d_name = FS2OTTD(dirent->d_name);

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		char filename[MAX_PATH];

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		if (!FiosIsValidFile(path, dirent, &sb)) continue;

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		snprintf(filename, lengthof(filename), "%s" PATHSEP "%s", path, d_name);

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		if (sb.st_mode & S_IFDIR) {

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			/* Directory */

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			if (strcmp(d_name, ".") == 0 || strcmp(d_name, "..") == 0) continue;

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			num += ScanPath(filename);

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		} else if (sb.st_mode & S_IFREG) {

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			/* File */

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			char *ext = strrchr(filename, '.');

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			char *file = filename + strlen(_path.data_dir) + 1; // Crop base path

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			/* If no extension or extension isn't .grf, skip the file */

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			if (ext == NULL) continue;

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			if (strcasecmp(ext, ".grf") != 0) continue;

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			c = calloc(1, sizeof(*c));

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			c->filename = strdup(file);

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			if (FillGRFDetails(c)) {

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				if (_all_grfs == NULL) {

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					_all_grfs = c;

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				} else {

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					/* Insert file into list at a position determined by its

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					 * name, so the list is sorted as we go along */

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					GRFConfig **pd, *d;

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					for (pd = &_all_grfs; (d = *pd) != NULL; pd = &d->next) {

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						if (strcasecmp(c->name, d->name) <= 0) break;

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					}

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					c->next = d;

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					*pd = c;

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				}

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				num++;

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			} else {

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				/* File couldn't be opened, or is either not a NewGRF or is a

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				 * 'system' NewGRF, so forget about it. */

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				free(c->filename);

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				free(c->name);

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				free(c->info);

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				free(c);

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			}

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		}

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	}

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	closedir(dir);

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	return num;

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}

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/* Scan for all NewGRFs */

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void ScanNewGRFFiles(void)

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{

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	uint num;

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	ClearGRFConfigList(_all_grfs);

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	_all_grfs = NULL;

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	DEBUG(grf, 1) ("[GRF] Scanning for NewGRFs");

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	num = ScanPath(_path.data_dir);

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	DEBUG(grf, 1) ("[GRF] Scan complete, found %d files", num);

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}

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/* Find a NewGRF in the scanned list */

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const GRFConfig *FindGRFConfig(uint32 grfid, uint8 *md5sum)

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{

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	GRFConfig *c;

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	static const uint8 blanksum[sizeof(c->md5sum)] = { 0 };

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	for (c = _all_grfs; c != NULL; c = c->next) {

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		if (c->grfid == grfid) {

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			if (memcmp(blanksum, c->md5sum, sizeof(c->md5sum)) == 0) CalcGRFMD5Sum(c);

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			if (memcmp(md5sum, c->md5sum, sizeof(c->md5sum)) == 0) return c;

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		}

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	}

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	return NULL;

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}

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/* Retrieve a NewGRF from the current config by its grfid */

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const GRFConfig *GetGRFConfig(uint32 grfid)

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{

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	GRFConfig *c;

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	for (c = _grfconfig; c != NULL; c = c->next) {

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		if (c->grfid == grfid) return c;

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	}

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	return NULL;

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}

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static const SaveLoad _grfconfig_desc[] = {

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	SLE_STR(GRFConfig, filename,   SLE_STR, 0x40),

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	SLE_VAR(GRFConfig, grfid,      SLE_UINT32),

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	SLE_ARR(GRFConfig, md5sum,     SLE_UINT8, 16),

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	SLE_ARR(GRFConfig, param,      SLE_UINT32, 0x80),

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	SLE_VAR(GRFConfig, num_params, SLE_UINT8),

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	SLE_END()

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};

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static void Save_NGRF(void)

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{

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	GRFConfig *c;

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	int index = 0;

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	for (c = _grfconfig; c != NULL; c = c->next) {

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		SlSetArrayIndex(index++);

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		SlObject(c, _grfconfig_desc);

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	}

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}

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static void Load_NGRF(void)

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{

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	GRFConfig *first = NULL;

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	GRFConfig **last = &first;

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	while (SlIterateArray() != -1) {

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		GRFConfig *c = calloc(1, sizeof(*c));

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		SlObject(c, _grfconfig_desc);

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		/* Append our configuration to the list */

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		*last = c;

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		last = &c->next;

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	}

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	ClearGRFConfigList(_grfconfig);

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	_grfconfig = first;

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}

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const ChunkHandler _newgrf_chunk_handlers[] = {

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	{ 'NGRF', Save_NGRF, Load_NGRF, CH_ARRAY | CH_LAST }

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};

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