<?php
namespace application\controllers;

class BackupController {

    // BackupFile: YYYY-MM-DD-prod_domain.tar.gz
    // DBBackupFile: YYYY-MM-DD-prod_domain.sql

    public static function listBackups($data):void {
        $username = $data['username'] ?? '';
        $domain = $data['domain'] ?? '';

        if (empty($username) || empty($domain)) {
            error_log("listBackups: ERROR: No username or domain provided");
            http_response_code(400);
            echo json_encode(['error' => 'Missing required parameters: username or domainname']);
            return;
        }

        $backupDir = "/home/$username/backups";
        error_log(" Starting function listbackups for " . $username . " and " . $domain . " : BackupDir " . $backupDir);
        if (!is_dir($backupDir)) {
            error_log(" ERROR: Backup Dir does not exist");
            http_response_code(404);
            echo json_encode(['error' => 'Backup directory not found']);
            return;
        }

        $files = array_diff(scandir($backupDir), ['.', '..']);
        $backupList = [];

        foreach ($files as $file) {
            if (preg_match('/^(\d{4}-\d{2}-\d{2})-' . preg_quote($domain, '/') . '\.tar\.gz$/', $file, $matches)) {
		        $originalDate = $matches[1];
                $swissDate = DateTime::createFromFormat('Y-m-d', $originalDate)->format('d.m.Y');
                $sizeMB = round(filesize("$backupDir/$file") / (1024 * 1024), 2);
                $backupList[] = [
                    'backup_date' => $originalDate,
                    'swiss_date' => $swissDate,
                    'size_mb' => $sizeMB,
                    'filename' => $file
                ];
            }
        }
        echo json_encode(['backups' => $backupList]);
    }

    // BackupFile: YYYY-MM-DD-prod_domain.tar.gz
    // DBBackupFile: YYYY-MM-DD-prod_domain.sql
    public static function restoreBackup($data):void {
        $username = $data['username'] ?? '';
        $domain = $data['domain'] ?? '';
        if (empty($username) || empty($data['backup_date']) || empty($domain)) {
            error_log("restoreBackup: ERROR: No username, domain provided or backup_date provided");
            http_response_code(400);
            echo json_encode(['error' => 'Missing required parameters']);
            return;
        }
        error_log(" Starting function restoreBackup for " . $username . " and " . $domain . " : Backup-Date " . $data['backup_date']);

        $backupDir = "/home/$username/backups";
        $webrootDir = "/home/$username/prod.$domain";
        $backupFile = $data['backup_date'] ?? '';
	    $backupFile = $backupFile . "-" . $domain . ".tar.gz";
        $dbBackupFile = $backupDir ." /" . $data['backup_date'] . "-prod_" . str_replace(['-', '.'], ["_", "_"], $domain);
        $prodDatabaseName = $username . "_prod_";
        $prodDatabaseName = $prodDatabaseName  . str_replace(['-', '.'], ["_", "_"], $domain);

        if (!file_exists($backupFile)) {
            error_log("restoreBackup: ERROR: Backup file $backupFile does not exist");
            http_response_code(404);
            echo json_encode(['error' => 'Web Backup file not found']);
            return;
        }

        if (!file_exists($dbBackupFile)) {
            error_log("restoreBackup: ERROR: Database backup file $dbBackupFile does not exist");
            http_response_code(404);
            echo json_encode(['error' => 'Database Backup file not found']);
            return;
        }

        exec("sudo /usr/bin/tar -xzf $backupFile -C $webrootDir", $output, $returnCode);
        if ($returnCode !== 0) {
                error_log("restoreBackup: ERROR: Failed to restore webroot, details' =>" . implode("\n", $output));
                http_response_code(500);
                echo json_encode(['error' => 'Failed to restore webroot', 'details' => implode("\n", $output)]);
                return;
        }

        exec("sudo /usr/bin/mysql $prodDatabaseName < $dbBackupFile", $output, $returnCode);
        if ($returnCode !== 0) {
            error_log("restoreBackup: ERROR: Failed to restore database, details' =>" . implode("\n", $output));
            http_response_code(500);
            echo json_encode(['error' => 'Failed to restore database', 'details' => implode("\n", $output)]);
            return;
        }
        echo json_encode(['success' => 'Backup restored successfully']);
    }
}