#include <dirent.h>
#include <sys/stat.h>

#include "private.h"


int heliInitialized;
HeliArray heliObjectsSet;


struct _Directory {
	HeliArray files;
};


static char *colors[][2] = {
	{ "transparent", "0 0 0 0" },
	
	{ "black",       "0 0 0 1" },
	{ "white",       "1 1 1 1" },
	{ "gray",        "0.5 0.5 0.5 1" },
	
	{ "red",         "1 0 0 1" },
	{ "green",       "0 1 0 1" },
	{ "blue",        "0 0 1 1" },
	
	{ "yellow",      "1 1 0 1" },
	{ "magenta",     "1 0 1 1" },
	{ "cyan",        "0 1 1 1" },
	
	{ "brown",       "0.5 0.5 0 1" },
};


int randomNumber(int min, int max)
	{ return max <= min ? min : rand()%(max - min + 1) + min; }

double randomFloat()
	{ return (double)rand()/(double)RAND_MAX; }


Directory openDirectory(const char *path) {
	if (!heliInitialized) return NULL;
	
	DIR *dir = opendir(path);
	if (!dir) return NULL;
	
	Directory d = calloc(1, sizeof(*d));
	
	struct dirent *ent;
	while((ent = readdir(dir)) != NULL) {
		if ( !ent->d_name[0]
		  || strcmp(ent->d_name, ".") == 0
		  || strcmp(ent->d_name, "..") == 0 ) continue;
		heliStringmapAdd(&d->files, ent->d_name, NULL, NULL);
	}
	closedir(dir);
	
	heliObjectRegister(d, (HeliFreeCallback)&closeDirectory);
	return d;
}

void closeDirectory(Directory directory) {
	if (!directory) return;
	heliObjectUnregister(directory);
	heliArrayDestroy(&directory->files);
	free(directory);
}

int directoryGetCount(Directory directory)
	{ return directory->files.count; }

const char* directoryGet(Directory directory, int i)
	{ return (const char*)heliArrayGetKey(&directory->files, i); }


int fileExists(const char *path) {
	struct stat s = {};
	return stat(path, &s) == 0 && !(s.st_mode & S_IFDIR);
}

int directoryExists(const char *path) {
	struct stat s = {};
	return stat(path, &s) == 0 && (s.st_mode & S_IFDIR);
}


char* heliStringCopy(const char *x) {
	int len = strlen(x) + 1;
	char *cp = malloc(len);
	memcpy(cp, x, len);
	return cp;
}

char* heliStringConcat(const char *a, const char *b) {
	int la = strlen(a);
	int lb = strlen(b);
	char *s = malloc(la + lb + 1);
	memcpy(s, a, la);
	memcpy(s + la, b, lb);
	s[la + lb] = 0;
	return s;
}

char* heliStringConcat3(const char *a, const char *b, const char *c) {
	int la = strlen(a);
	int lb = strlen(b);
	int lc = strlen(c);
	char *s = malloc(la + lb + lc + 1);
	memcpy(s, a, la);
	memcpy(s + la, b, lb);
	memcpy(s + la + lb, c, lc);
	s[la + lb + lc] = 0;
	return s;
}

int heliStringEndsWithLowcase(const char *s, const char *tail) {
	int ls = strlen(s);
	int lt = strlen(tail);
	if (lt > ls) return FALSE;
	for(int i = 0; i < lt; ++i)
		if (tolower(s[ls - i]) != tolower(tail[lt - i]))
			return FALSE;
	return TRUE;
}

void heliLowercase(char *x)
	{ while(*x) { *x = tolower(*x); ++x; } }


static unsigned int colorToInt(double c) {
	if (!(c > 0)) c = 0;
	if (!(c < 1)) c = 1;
	return (unsigned int)floor(c*255.99);
}


void heliColorToDouble(unsigned int code, double *rgba) {
	rgba[0] = ( code >> 24         )/255.0;
	rgba[1] = ((code >> 16) & 0xFFu)/255.0;
	rgba[2] = ((code >>  8) & 0xFFu)/255.0;
	rgba[3] = ( code        & 0xFFu)/255.0;
}

unsigned int colorByRGBA(double r, double g, double b, double a) {
	return (colorToInt(r) << 24)
	     | (colorToInt(g) << 16)
	     | (colorToInt(b) <<  8)
	     |  colorToInt(a);
}

unsigned int colorByRGB(double r, double g, double b)
	{ return colorByRGBA(r, g, b, 1); }

unsigned int colorByName(const char *colorName) {
	unsigned int code = 0;
	
	const char *x = colorName;
	if (*x == '#') {
		++x;
		int hex[8] = { 0, 0, 0, 0, 0, 0, 15, 15 };
		for(int i = 0; *x && i < 8; ++i, ++x) {
			char c = tolower(*x);
			if (c >= '0' && c <= '9') hex[i] = c - '0';
			if (c >= 'a' && c <= 'f') hex[i] = c - 'a' + 10;
		}
		for(int i = 0; i < 8; ++i)
			code |= ( hex[i] << ((7-i)*4) );
	} else
	if (isalpha(*x)) {
		int count = (int)(sizeof(colors)/sizeof(*colors));
		for(int i = 0; i < count; ++i) {
			const char *a = x, *b = colors[i][0];
			do {
				if (tolower(*a) != tolower(*b)) break;
				++a, ++b;
				if (!*a && !*b) return colorByName(colors[i][1]);
			} while (*a && *b);
		}
	} else {
		double r = 0, g = 0, b = 0, a = 1;
		sscanf(x, "%lf %lf %lf %lf", &r, &g, &b, &a);
		code = colorByRGBA(r, g, b, a);
	}
	return code;
}


static int objectsCompare(const void *a, const void *b)
	{ return a < b ? -1 : b < a ? 1 : 0; }

static void* objectsKeyClone(void *k)
	{ return k; }

void heliObjectRegister(void *o, HeliFreeCallback fo)
	{ heliMapAdd(&heliObjectsSet, o, &objectsCompare, (HeliCloneCallback)objectsKeyClone, fo, NULL, NULL); }

void heliObjectUnregister(void *o) {
	int i;
	HeliPair *item = heliMapFind(&heliObjectsSet, o, &objectsCompare, &i);
	if (item) {
		item->freeKey = NULL;
		heliArrayRemove(&heliObjectsSet, i);
	}
}