#include "settings.h"

static void print_config_error(GError *error) {
	if (error == NULL) return;

	if (error->domain != G_KEY_FILE_ERROR_GROUP_NOT_FOUND && error->domain != G_KEY_FILE_ERROR_KEY_NOT_FOUND) {
		g_printerr("Config error: %s\n", error->message);
	}
}

void print_config(config_t *config) {
#define EXPAND_GROUP(group_name, members) \
	g_print("[%s]\n", #group_name); \
	members

#define EXPAND_GROUP_MEMBER(member, key_type) \
	g_print("%s="FORMAT_FOR_KEY_TYPE(key_type)"\n", #member, config->member);

	EXPAND_CONFIG

#undef EXPAND_GROUP
#undef EXPAND_GROUP_MEMBER
}

void load_config_from_key_file(config_t *config, GKeyFile *key_file) {
	static GError *error = NULL;
	gchar *group_name;

#define EXPAND_GROUP(name, members) \
	group_name = #name; \
	if (g_key_file_has_group(key_file, group_name)) { \
		members \
	}

#define EXPAND_GROUP_MEMBER(member, key_type) \
	config->member = g_key_file_get_##key_type(key_file, group_name, #member, &error); \
	print_config_error(error); \
	if (error != NULL) g_clear_error(&error);

	EXPAND_CONFIG

	if (config->rewind_duration > 600) {
		g_warning("Setting Emulation.rewind_duration too high might affect performance.\n");
	}

#undef EXPAND_GROUP
#undef EXPAND_GROUP_MEMBER
}

void init_settings(gchar *path) {
	free_settings();
	key_file = g_key_file_new();

	if (path != NULL) {
		settings_file_path = path;
	}
	else {
		settings_file_path = g_build_filename(g_get_user_config_dir(), SETTINGS_FILE, NULL);
	}

	load_settings();
}

int load_settings(void) {
	GError *error = NULL;

	g_print("Trying to load settings from %s\n", settings_file_path);

	if (!g_key_file_load_from_file(key_file, settings_file_path, G_KEY_FILE_KEEP_COMMENTS | G_KEY_FILE_KEEP_TRANSLATIONS, &error)) {
		if (error->domain == G_FILE_ERROR) {
			g_warning("Unable to load %s: %s", settings_file_path, error->message);
		}
		else if (error->domain == G_KEY_FILE_ERROR) {
			g_warning("Failed to parse %s: %s", settings_file_path, error->message);
		}

		g_error_free(error);
		return -1;
	}

	load_config_from_key_file(&config, key_file);
	print_config(&config);

	return 0;
}

void save_settings(void) {
	GError *error = NULL;

	g_print("Trying to save settings to %s\n", settings_file_path);
	
	if (!g_key_file_save_to_file(key_file, settings_file_path, &error)) {
		g_warning ("Failed to save %s: %s", settings_file_path, error->message);
		g_error_free(error);
		return;
	}
}

void free_settings(void) {
	if (key_file != NULL) {
		g_key_file_free(key_file);
		key_file = NULL;
	}
}