/*

 * Hedgewars, a free turn based strategy game

 * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>

 *

 * 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 "util.h"

#include "logging.h"

#include <stddef.h>

#include <stdarg.h>

#include <stdlib.h>

#include <string.h>

#include <stdio.h>

#include <ctype.h>

#include <limits.h>

char *flib_asprintf(const char *fmt, ...) {

	va_list argp;

	va_start(argp, fmt);

	char *result = flib_vasprintf(fmt, argp);

	va_end(argp);

	return result;

}

char *flib_vasprintf(const char *fmt, va_list args) {

	char *result = NULL;

	if(!log_badargs_if(fmt==NULL)) {

		int requiredSize = vsnprintf(NULL, 0, fmt, args)+1;					// Figure out how much memory we need,

		if(!log_e_if(requiredSize<0, "Error formatting string with template \"%s\"", fmt)) {

			char *tmpbuf = flib_malloc(requiredSize);						// allocate it

			if(tmpbuf && vsnprintf(tmpbuf, requiredSize, fmt, args)>=0) {	// and then do the actual formatting.

				result = tmpbuf;

				tmpbuf = NULL;

			}

			free(tmpbuf);

		}

	}

	return result;

}

char *flib_join(char **parts, int partCount, const char *delimiter) {

	char *result = NULL;

	if(!log_badargs_if2(parts==NULL, delimiter==NULL)) {

		size_t totalSize = 1;

		size_t delimLen = strlen(delimiter);

		for(int i=0; i<partCount; i++) {

			totalSize += strlen(parts[i]) + delimLen;

		}

		result = flib_malloc(totalSize);

		if(result) {

			size_t outpos = 0;

			for(int i=0; i<partCount; i++) {

				if(i>0) {

					strcpy(result+outpos, delimiter);

					outpos += delimLen;

				}

				strcpy(result+outpos, parts[i]);

				outpos += strlen(parts[i]);

			}

		}

	}

	return result;

}

char *flib_strdupnull(const char *str) {

	return str==NULL ? NULL : flib_asprintf("%s", str);

}

void *flib_bufdupnull(const void *buf, size_t size) {

	void *result = NULL;

	if(!log_badargs_if(buf==NULL && size>0)) {

		result = flib_malloc(size);

		if(result) {

			memcpy(result, buf, size);

		}

	}

	return result;

}

void *flib_malloc(size_t size) {

	void *result = malloc(size);

	if(!result && size>0) {

		flib_log_e("Out of memory trying to malloc %zu bytes.", size);

	}

	return result;

}

void *flib_calloc(size_t count, size_t elementsize) {

	void *result = calloc(count, elementsize);

	if(!result && count>0 && elementsize>0) {

		flib_log_e("Out of memory trying to calloc %zu objects of %zu bytes each.", count, elementsize);

	}

	return result;

}

void *flib_realloc(void *ptr, size_t size) {

	void *result = realloc(ptr, size);

	if(!result && size>0) {

		flib_log_e("Out of memory trying to realloc %zu bytes.", size);

	}

	return result;

}

static bool isAsciiAlnum(char c) {

	return (c>='0' && c<='9') || (c>='a' && c <='z') || (c>='A' && c <='Z');

}

char *flib_urlencode(const char *inbuf) {

	return flib_urlencode_pred(inbuf, isAsciiAlnum);

}

static size_t countCharsToEscape(const char *inbuf, bool (*needsEscaping)(char c)) {

	size_t result = 0;

	for(const char *c=inbuf; *c; c++) {

		if(needsEscaping(*c)) {

			result++;

		}

	}

	return result;

}

char *flib_urlencode_pred(const char *inbuf, bool (*needsEscaping)(char c)) {

	char *result = NULL;

	if(inbuf && !log_badargs_if(needsEscaping == NULL)) {

		size_t insize = strlen(inbuf);

		if(!log_e_if(insize > SIZE_MAX/4, "String too long: %zu bytes.", insize)) {

			size_t escapeCount = countCharsToEscape(inbuf, needsEscaping);

			result = flib_malloc(insize + escapeCount*2 + 1);

		}

		if(result) {

			char *out = result;

			for(const char *in = inbuf; *in; in++) {

				if(!needsEscaping(*in)) {

					*out = *in;

					out++;

				} else {

					snprintf(out, 4, "%%%02x", (unsigned)(*(uint8_t*)in));

					out += 3;

				}

			}

			*out = 0;

		}

	}

	return result;

}

char *flib_urldecode(const char *inbuf) {

	if(!inbuf) {

		return NULL;

	}

	char *outbuf = flib_malloc(strlen(inbuf)+1);

	if(!outbuf) {

		return NULL;

	}

    size_t inpos = 0, outpos = 0;

    while(inbuf[inpos]) {

        if(inbuf[inpos] == '%' && isxdigit(inbuf[inpos+1]) && isxdigit(inbuf[inpos+2])) {

            char temp[3] = {inbuf[inpos+1],inbuf[inpos+2],0};

            outbuf[outpos++] = strtol(temp, NULL, 16);

            inpos += 3;

        } else {

        	outbuf[outpos++] = inbuf[inpos++];

        }

    }

    outbuf[outpos] = 0;

    char *shrunk = realloc(outbuf, outpos+1);

    return shrunk ? shrunk : outbuf;

}

bool flib_contains_dir_separator(const char *str) {

	if(!log_badargs_if(!str)) {

		for(;*str;str++) {

			if(*str=='\\' || *str=='/') {

				return true;

			}

		}

	}

	return false;

}

bool flib_strempty(const char *str) {

	return !str || !*str;

}

int flib_gets(char *str, size_t strlen) {

	if(fgets(str, strlen, stdin)) {

		for(char *s=str; *s; s++) {

			if(*s=='\r' || *s=='\n') {

				*s = 0;

				break;

			}

		}

		return 0;

	}

	return -1;

}