#include <gtk/gtk.h>
#include <glib.h>
#include <cstdlib>
#include <cstring>
#include <cstdio>
#include <ctime>
#include <fstream>
#include <string>
#include "config.h"
#include "rsync_manager.h"
#include "snapshot_manager.h"
#include "main_window.h"

static FILE* log_file = nullptr;
static bool log_to_stdout = false;

static std::string get_log_path() {
	const char* home = getenv("HOME");
	if (!home) home = ".";
	std::string dir = std::string(home) + "/.config/x3-backup";
	std::string cmd = "mkdir -p \"" + dir + "\"";
	(void)system(cmd.c_str());
	return dir + "/x3-backup.log";
}

static void log_handler(const gchar* domain, GLogLevelFlags level, const gchar* message, gpointer) {
	const char* level_str = "INFO";
	if (level & G_LOG_LEVEL_WARNING) level_str = "WARN";
	if (level & G_LOG_LEVEL_CRITICAL) level_str = "CRIT";
	if (level & G_LOG_LEVEL_ERROR) level_str = "ERROR";

	time_t now = time(nullptr);
	struct tm* t = localtime(&now);
	char timebuf[32];
	strftime(timebuf, sizeof(timebuf), "%Y-%m-%d %H:%M:%S", t);

	char line[2048];
	snprintf(line, sizeof(line), "[%s] [%s] %s: %s\n", timebuf, level_str, domain ? domain : "app", message);

	if (log_to_stdout) {
		fputs(line, stdout);
		fflush(stdout);
	}
	if (log_file) {
		fputs(line, log_file);
		fflush(log_file);
	}
}

static void setup_logging(bool cli_mode) {
	const char* env_log = g_getenv("X3_BACKUP_LOG");
	if (env_log && strcmp(env_log, "1") == 0) {
		log_to_stdout = true;
	}

	if (cli_mode) {
		log_to_stdout = true;
	}

	std::string path = get_log_path();
	log_file = fopen(path.c_str(), "a");
	if (!log_file) {
		g_warning("Cannot open log file: %s", path.c_str());
	}

	g_log_set_handler("x3-backup", (GLogLevelFlags)(G_LOG_LEVEL_MASK), log_handler, nullptr);
	g_log_set_handler(nullptr, (GLogLevelFlags)(G_LOG_LEVEL_MASK), log_handler, nullptr);

	g_message("=== x3-backup started ===");
	g_message("Log file: %s", path.c_str());
}

int main(int argc, char* argv[]) {
	gtk_init(&argc, &argv);

	bool system_mode = false;
	bool backup_now = false;
	bool show_help = false;
	bool cli_mode = false;

	for (int i = 1; i < argc; i++) {
		if (strcmp(argv[i], "--system-backup") == 0) {
			system_mode = true;
			backup_now = true;
			cli_mode = true;
		} else if (strcmp(argv[i], "--backup") == 0) {
			backup_now = true;
			cli_mode = true;
		} else if (strcmp(argv[i], "--help") == 0 || strcmp(argv[i], "-h") == 0) {
			show_help = true;
		} else if (strcmp(argv[i], "--log") == 0) {
			log_to_stdout = true;
		}
	}

	setup_logging(cli_mode);

	if (show_help) {
		g_print("x3-Backup - GTK3 Backup/Snapshot Tool\n\n");
		g_print("Usage: x3-backup [OPTIONS]\n\n");
		g_print("Options:\n");
		g_print("  --backup          Create a backup immediately and exit\n");
		g_print("  --system-backup   Create a full system backup and exit\n");
		g_print("  --log             Print log to stdout\n");
		g_print("  --help, -h        Show this help\n\n");
		g_print("Without options, x3-backup starts in GUI mode with system tray.\n\n");
		g_print("Log file: ~/.config/x3-backup/x3-backup.log\n");
		return 0;
	}

	Config config;
	config.load();

	if (backup_now) {
		if (system_mode) {
			config.set_system_backup_mode(true);
			config.settings().source_path = "/";
			g_message("System backup mode: backing up entire system");
		}

		RsyncManager rsync(config);
		SnapshotManager snapshots(config, rsync);

		g_message("Starting backup...");
		snapshots.cleanup_old_snapshots();
		std::string ts = snapshots.create_snapshot(system_mode ? "System backup" : "Manual backup");
		if (!ts.empty()) {
			g_message("Backup completed: %s", ts.c_str());
		} else {
			g_warning("Backup failed!");
			return 1;
		}
		return 0;
	}

	MainWindow window(config);
	window.run();

	g_message("=== x3-backup exiting ===");
	if (log_file) fclose(log_file);

	return 0;
}