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

#include "config.h"
#include "system.h"
#include "utils.h"

#define CONFIG_STR_SIZE 128

static struct uconfig_s *uconfig;
static char *ftag_config_keys[FC_COUNT];
static char ftag_config_values[FC_COUNT][CONFIG_STR_SIZE];

static void ftag_config_read(enum ftag_config_e key)
{
	char *new_value = uconfig_get(uconfig, ftag_config_keys[key]);
	if (new_value != NULL) {
		assert(strlen(new_value) < CONFIG_STR_SIZE);
		strcpy(ftag_config_values[key], new_value);
	}
}

static int ftag_config_load_file(const char *config_file)
{
	if (!(config_file && file_exists(config_file)))
		return 0;

	uconfig = uconfig_new(config_file);
	if (uconfig == NULL) {
		fprintf(stderr,
			"%s: error during configuration file parsing\n",
			__func__);
		exit(EXIT_FAILURE);
	}
	for (enum ftag_config_e key = FC_FIRST; key < FC_COUNT; key++) {
		ftag_config_read(key);
	}
	return 1;
}

void ftag_config_init(const char *opt_config_file)
{
	const char *env_xdg_config_home = getenv("XDG_CONFIG_HOME");
	const char *env_home = getenv("HOME");
	char config_file[512];

	if (opt_config_file) {
		strbuild(config_file, "%s", opt_config_file);
	}
	else if (env_xdg_config_home) {
		strbuild(config_file,
			 "%s/.config/ftag/ftag.conf", env_xdg_config_home);
	}
	else {
		assert(env_home);
		strbuild(config_file,
			 "%s/.config/ftag/ftag.conf", env_home);
	}

	/* Keys */
	ftag_config_keys[FC_DATABASE_PATH] = "database_path";
	ftag_config_keys[FC_CACHE_DIR] = "cache_dir";
	ftag_config_keys[FC_REMOTE_HOST] = "remote_host";
	ftag_config_keys[FC_REMOTE_ROOT] = "remote_root";

	/* Defaults */
	strbuild(ftag_config_values[FC_DATABASE_PATH],
		 "%s/.cache/ftag/ftag.sqlite3", env_home);
	strbuild(ftag_config_values[FC_CACHE_DIR],
		 "%s/.cache/ftag", env_home);
	strcpy(ftag_config_values[FC_REMOTE_HOST], "localhost");
	strcpy(ftag_config_values[FC_REMOTE_ROOT], "ftag");

	uconfig = NULL;
	int config_loaded = 0;

	config_loaded = ftag_config_load_file(config_file);
	if (config_loaded)
		return;

	ftag_config_load_file(config_file);
}

const char *ftag_config_get(enum ftag_config_e key)
{
	return ftag_config_values[key];
}

void ftag_config_finalize(void)
{
	if (uconfig)
		uconfig_destroy(uconfig);
}