// Copyright (c) Athena Dev Teams - Licensed under GNU GPL
// For more information, see LICENCE in the main folder

#include "../common/cbasetypes.h"
#include "../common/mmo.h"
#include "../common/malloc.h"
#include "../common/showmsg.h"
#include "utils.h"

#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <math.h> // floor()

#ifdef WIN32
	#include <windows.h>
#else
	#include <unistd.h>
	#include <dirent.h>
	#include <sys/stat.h>
#endif

// generate a hex dump of the first 'length' bytes of 'buffer'
void dump(FILE* fp, const unsigned char* buffer, int length)
{
	int i, j;

	fprintf(fp, "         Hex                                                  ASCII\n");
	fprintf(fp, "         -----------------------------------------------      ----------------");

	for (i = 0; i < length; i += 16)
	{
		fprintf(fp, "\n%p ", &buffer[i]);
		for (j = i; j < i + 16; ++j)
		{
			if (j < length)
				fprintf(fp, "%02hX ", buffer[j]);
			else
				fprintf(fp, "   ");
		}

		fprintf(fp, "  |  ");

		for (j = i; j < i + 16; ++j)
		{
			if (j < length) {
				if (buffer[j] > 31 && buffer[j] < 127)
					fprintf(fp, "%c", buffer[j]);
				else
					fprintf(fp, ".");
			} else
				fprintf(fp, " ");
		}
	}
	fprintf(fp, "\n");
}


#ifdef WIN32

static char* checkpath(char *path, const char *srcpath)
{	// just make sure the char*path is not const
	char *p=path;
	if(NULL!=path && NULL!=srcpath)
	while(*srcpath) {
		if (*srcpath=='/') {
			*p++ = '\\';
			srcpath++;
		}
		else
			*p++ = *srcpath++;
	}
	*p = *srcpath; //EOS
	return path;
}

void findfile(const char *p, const char *pat, void (func)(const char*))
{	
	WIN32_FIND_DATAA FindFileData;
	HANDLE hFind;
	char tmppath[MAX_PATH+1];
	
	const char *path    = (p  ==NULL)? "." : p;
	const char *pattern = (pat==NULL)? "" : pat;
	
	checkpath(tmppath,path);
	if( PATHSEP != tmppath[strlen(tmppath)-1])
		strcat(tmppath, "\\*");
	else
		strcat(tmppath, "*");
	
	hFind = FindFirstFileA(tmppath, &FindFileData);
	if (hFind != INVALID_HANDLE_VALUE)
	{
		do
		{
			if (strcmp(FindFileData.cFileName, ".") == 0)
				continue;
			if (strcmp(FindFileData.cFileName, "..") == 0)
				continue;

			sprintf(tmppath,"%s%c%s",path,PATHSEP,FindFileData.cFileName);

			if (FindFileData.cFileName && strstr(FindFileData.cFileName, pattern)) {
				func( tmppath );
			}


			if( FindFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY )
			{
				findfile(tmppath, pat, func);
			}
		}while (FindNextFileA(hFind, &FindFileData) != 0);
		FindClose(hFind);
	}
	return;
}
#else

#define MAX_DIR_PATH 2048

static char* checkpath(char *path, const char*srcpath)
{	// just make sure the char*path is not const
	char *p=path;
	if(NULL!=path && NULL!=srcpath)
	while(*srcpath) {
		if (*srcpath=='\\') {
			*p++ = '/';
			srcpath++;
		}
		else
			*p++ = *srcpath++;
	}
	*p = *srcpath; //EOS
	return path;
}

void findfile(const char *p, const char *pat, void (func)(const char*))
{	
	DIR* dir;					// pointer to the scanned directory.
	struct dirent* entry;		// pointer to one directory entry.
	struct stat dir_stat;       // used by stat().
	char tmppath[MAX_DIR_PATH+1];
	char path[MAX_DIR_PATH+1]= ".";
	const char *pattern = (pat==NULL)? "" : pat;
	if(p!=NULL) strcpy(path,p);

	// open the directory for reading
	dir = opendir( checkpath(path, path) );
	if (!dir) {
		ShowError("Cannot read directory '%s'\n", path);
		return;
	}

	// scan the directory, traversing each sub-directory
	// matching the pattern for each file name.
	while ((entry = readdir(dir))) {
		// skip the "." and ".." entries.
		if (strcmp(entry->d_name, ".") == 0)
			continue;
		if (strcmp(entry->d_name, "..") == 0)
			continue;

		sprintf(tmppath,"%s%c%s",path, PATHSEP, entry->d_name);

		// check if the pattern matchs.
		if (entry->d_name && strstr(entry->d_name, pattern)) {
			func( tmppath );
		}
		// check if it is a directory.
		if (stat(tmppath, &dir_stat) == -1) {
			ShowError("stat error %s\n': ", tmppath);
			continue;
		}
		// is this a directory?
		if (S_ISDIR(dir_stat.st_mode)) {
			// decent recursivly
			findfile(tmppath, pat, func);
		}
	}//end while
}
#endif

uint8 GetByte(uint32 val, int idx)
{
	switch( idx )
	{
	case 0: return (uint8)( (val & 0x000000FF)         );
	case 1: return (uint8)( (val & 0x0000FF00) >> 0x08 );
	case 2: return (uint8)( (val & 0x00FF0000) >> 0x10 );
	case 3: return (uint8)( (val & 0xFF000000) >> 0x18 );
	default:
#if defined(DEBUG)
		ShowDebug("GetByte: invalid index (idx=%d)\n", idx);
#endif
		return 0;
	}
}

uint16 GetWord(uint32 val, int idx)
{
	switch( idx )
	{
	case 0: return (uint16)( (val & 0x0000FFFF)         );
	case 1: return (uint16)( (val & 0xFFFF0000) >> 0x10 );
	default:
#if defined(DEBUG)
		ShowDebug("GetWord: invalid index (idx=%d)\n", idx);
#endif
		return 0;
	}
}
uint16 MakeWord(uint8 byte0, uint8 byte1)
{
	return byte0 | (byte1 << 0x08);
}

uint32 MakeDWord(uint16 word0, uint16 word1)
{
	return
		( (uint32)(word0        ) )|
		( (uint32)(word1 << 0x10) );
}


/// calculates the value of A / B, in percent (rounded down)
unsigned int get_percentage(const unsigned int A, const unsigned int B)
{
	double result;

	if( B == 0 )
	{
		ShowError("get_percentage(): divison by zero! (A=%u,B=%u)\n", A, B);
		return -1;
	}

	result = 100 * ((double)A / (double)B);

	if( result > UINT_MAX )
	{
		ShowError("get_percentage(): result percentage too high! (A=%u,B=%u,result=%g)\n", A, B, result);
		return UINT_MAX;
	}

	return (unsigned int)floor(result);
}