#include <glib.h></glib.h>

#include "private.h"

cairo_t *heliCairo;

int heliInitialized;

HeliArray heliObjectsSet;

struct _Directory {

	HeliArray files;

};

static char *colors[] = {

	"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",

	"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;

	GDir *dir = g_dir_open(path, 0, NULL);

	if (!dir) return NULL;

	Directory d = calloc(1, sizeof(Directory));

	while(TRUE) {

		const char* name = g_dir_read_name(dir);

		if (!name) break;

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

		heliStringmapAdd(&d->files, name, NULL, NULL);

	}

	g_dir_close(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)

	{ return g_file_test(path, G_FILE_TEST_IS_REGULAR) ? TRUE : FALSE; }

int directoryExists(const char *path)

	{ return g_file_test(path, G_FILE_TEST_IS_DIR) ? TRUE : FALSE; }

char* heliStringCopy(const char *x) {

	int len = strlen(x) + 1;

	char *cp = malloc(len + 1);

	memcpy(cp, x, len);

	return cp;

}

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; } }

void heliParseColor(const char *x, double *color) {

	color[0] = color[1] = color[2] = 0;

	color[3] = 1;

	if (*x == '#') {

		++x;

		int hex[8] = { 0, 0, 0, 0, 0, 0, 15, 15 };

		for(int i = 0; *x && i < 8; ++i) {

			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 < 4; ++i)

			color[i] = (hex[i*2]*16 + hex[i*2 + 1])/255.0;

	} else

	if (isalpha(*x)) {

		int count = (int)(sizeof(colors)/sizeof(*colors)/2);

		for(int i = 0; i < count; ++i)

			if (strcmp(x, colors[i*2]) == 0)

				{ heliParseColor(colors[i*2 + 1], color); return; }

	} else {

		sscanf(x, "%lf %lf %lf %lf", &color[0], &color[1], &color[2], &color[3]);

	}

}

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);

	}

}