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

#include "channel.h"

struct channel_t *channels;
int channel_count;

void channel_init() {
	channels = NULL;
	channel_count = 0;
}

struct channel_t *channel_add(const char *name) {
	channels = realloc(channels, ++channel_count * sizeof(struct regexset_t));
	if(!channels) {
		char *error = strerror(errno);
		fprintf(stderr, "Could not (re)allocate memory for channels: %s\n", error);
		return NULL;
	}
	struct channel_t *channel = &channels[channel_count-1];
	channel->name = strdup(name);
	channel->files = NULL;
	return channel;
}

struct channel_file_t *channel_file_add(struct channel_t *channel, const char *path, int rs_index) {
	struct channel_file_t *file = malloc(sizeof(struct channel_file_t));
	struct channel_file_t *last = channel->files;
	if(last) {
		while(last->next) last = last->next;
		last->next = file;
	} else
		channel->files = file;
	file->path = strdup(path);
	file->rs = rs_get(rs_index);
	file->next = NULL;
	if(!file->rs)
		return NULL;
	return file;
}

int channel_get_count() {
	return channel_count;
}

struct channel_t *channel_get(int index) {
	return (index < channel_count ? &channels[index] : NULL);
}

void channel_free() {
	for(int i = 0; i < channel_count; i++) {
		free(channels[i].name);
		struct channel_file_t *file = channels[i].files;
		while(file) {
			struct channel_file_t *next = file->next;
			free(file);
			file = next;
		}
	}
	free(channels);
	channels = NULL;
}