#include <string.h>
#include <stdio.h>
#include <stdlib.h>

#include "mapindex.h"
#include "../common/mmo.h"
#include "../common/showmsg.h"
#include "../common/malloc.h"

#define MAX_MAPINDEX 2000

//Leave an extra char of space to hold the terminator, in case for the strncpy(mapindex_id2name()) calls.
struct indexes {
	char name[MAP_NAME_LENGTH+1]; //Stores map name
	int length; //Stores string length WITHOUT the extension for quick lookup.
} indexes[MAX_MAPINDEX];

static unsigned short max_index = 0;

char mapindex_cfgfile[80] = "db/map_index.txt";

/// Adds a map to the specified index
/// Returns 1 if successful, 0 oherwise
static int mapindex_addmap(int index, const char *name)
{
	char map_name[1024];
	char *ext;
	int length;

	if (index < 0 || index >= MAX_MAPINDEX) {
		ShowError("(mapindex_add) Map index (%d) for \"%s\" out of range (max is %d)\n", index, name, MAX_MAPINDEX);
		return 0;
	}
	snprintf(map_name, 1024, "%s", name);
	map_name[1023] = 0;
	length = strlen(map_name);
	if (length > MAP_NAME_LENGTH) {
		ShowError("(mapindex_add) Map name %s is too long. Maps are limited to %d characters.\n", map_name, MAP_NAME_LENGTH);
		return 0;
	}
	if ((ext = strstr(map_name, ".gat")) != NULL) { //Gat map
		length = ext-map_name;
	} else if ((ext = strstr(map_name, ".afm")) != NULL || (ext = strstr(map_name, ".af2")) != NULL) { //afm map
		length = ext-map_name;
		sprintf(ext, ".gat"); //Change the extension to gat
	} else if ((ext = strstr(map_name, ".")) != NULL) { //Generic extension?
		length = ext-map_name;
		sprintf(ext, ".gat");
	} else { //No extension?
		length = strlen(map_name);
		strcat(map_name, ".gat");
	}
	if (length > MAP_NAME_LENGTH - 4) {
		ShowError("(mapindex_add) Adjusted Map name %s is too long. Maps are limited to %d characters.\n", map_name, MAP_NAME_LENGTH);
		return 0;
	}

	if (indexes[index].length)
		ShowWarning("(mapindex_add) Overriding index %d: map \"%s\" -> \"%s\"\n", indexes[index].name, map_name);

	strncpy(indexes[index].name, map_name, MAP_NAME_LENGTH);
	indexes[index].length = length;
	if (max_index <= index)
		max_index = index+1;
	return 1;
}

unsigned short mapindex_name2id(char* name) {
	//TODO: Perhaps use a db to speed this up? [Skotlex]
	int i;
	int length = strlen(name);
	char *ext = strstr(name, ".");
	if (ext)
		length = ext-name; //Base map-name length without the extension.
	for (i = 1; i < max_index; i++)
	{
		if (indexes[i].length == length && strncmp(indexes[i].name,name,length)==0)
			return i;
	}
#ifdef MAPINDEX_AUTOADD
	if( mapindex_addmap(i,name) )
	{
		ShowDebug("mapindex_name2id: Auto-added map \"%s\" to position %d\n", indexes[i], i);
		return i;
	}
	ShowWarning("mapindex_name2id: Failed to auto-add map \"%s\" to position %d!\n", name, i);
	return 0;
#else
	ShowDebug("mapindex_name2id: Map \"%s\" not found in index list!\n", name);
	return 0;
#endif
}

const char* mapindex_id2name(unsigned short id) {
	if (id > MAX_MAPINDEX || !indexes[id].length) {
		ShowDebug("mapindex_id2name: Requested name for non-existant map index [%d] in cache.\n", id);
		return indexes[0].name; //Theorically this should never happen, hence we return this string to prevent null pointer crashes.
	}
	return indexes[id].name;
}

void mapindex_init(void) {
	FILE *fp;
	char line[1024];
	int last_index = -1;
	int index;
	char map_name[1024];
	
	memset (&indexes, 0, sizeof (indexes));
	fp=fopen(mapindex_cfgfile,"r");
	if(fp==NULL){
		ShowFatalError("Unable to read mapindex config file %s!\n", mapindex_cfgfile);
		exit(1); //Server can't really run without this file.
	}
	while(fgets(line,1020,fp)){
		if(line[0] == '/' && line[1] == '/')
			continue;

		switch (sscanf(line,"%1000s\t%d",map_name,&index)) {
			case 1: //Map with no ID given, auto-assign
				index = last_index+1;
			case 2: //Map with ID given
				mapindex_addmap(index,map_name);
				break;
			default:
				continue;
		}
		last_index = index;
	}
	fclose(fp);
}

void mapindex_final(void) {
}