<?php

namespace App\RSpade\Commands\Migrate;

use Illuminate\Console\Command;
use Illuminate\Support\Facades\DB;
use Symfony\Component\Process\Process;
use Symfony\Component\Process\Exception\ProcessFailedException;

class Migrate_Rollback_Command extends Command
{
    use PrivilegedCommandTrait;
    protected $signature = 'migrate:rollback';
    protected $description = 'Rollback the database to the snapshot taken at migrate:begin';
    
    protected $mysql_data_dir = '/var/lib/mysql';
    protected $backup_dir = '/var/lib/mysql_backup';
    protected $flag_file = '/var/www/html/.migrating';
    
    public function handle()
    {
        // Check if in migration mode
        if (!file_exists($this->flag_file)) {
            $this->error('[WARNING]  No migration session in progress!');
            $this->info('Run "php artisan migrate:begin" to start a migration session.');
            return 1;
        }
        
        // Check if backup exists
        if (!is_dir($this->backup_dir)) {
            $this->error('[ERROR] Backup directory not found!');
            $this->info('The backup may have been corrupted or deleted.');
            $this->warn('You may need to manually restore from a different backup.');
            
            // Remove flag file since backup is gone
            unlink($this->flag_file);
            return 1;
        }
        
        $this->warn('[WARNING]  Restoring database to the snapshot taken at migrate:begin.');
        $this->info(' Starting database rollback...');
        
        try {
            // Step 1: Stop MySQL using supervisorctl
            $this->info('[1]  Stopping MySQL server...');
            $this->shell_exec_privileged('supervisorctl stop mysql 2>&1');

            // Wait a moment for process to die
            sleep(3);

            // Step 2: Clear current MySQL data
            $this->info('[2]  Clearing current database data...');
            // Use shell_exec to clear directory contents instead of removing directory
            $this->shell_exec_privileged("rm -rf {$this->mysql_data_dir}/* 2>/dev/null");
            $this->shell_exec_privileged("rm -rf {$this->mysql_data_dir}/.* 2>/dev/null");

            // Step 3: Restore backup
            $this->info('[3]  Restoring database snapshot...');
            $this->shell_exec_privileged("cp -r {$this->backup_dir}/* {$this->mysql_data_dir}/");
            $this->shell_exec_privileged("cp -r {$this->backup_dir}/.[^.]* {$this->mysql_data_dir}/ 2>/dev/null");

            // Step 4: Fix permissions (MySQL needs to own the files)
            $this->info('[4]  Setting correct permissions...');
            $this->run_privileged_command(['chown', '-R', 'mysql:mysql', $this->mysql_data_dir]);

            // Step 5: Start MySQL using supervisorctl
            $this->info('[5]  Starting MySQL server...');
            $this->shell_exec_privileged('mkdir -p /var/run/mysqld');
            $this->shell_exec_privileged('supervisorctl start mysql 2>&1');
            
            // Step 6: Wait for MySQL to be ready
            $this->info('[6]  Waiting for MySQL to be ready...');
            $this->wait_for_mysql_ready();
            
            // Step 7: Keep backup and flag - stay in migration mode
            $this->info('[7]  Rollback complete...');
            
            // Success
            $this->info('');
            $this->info('[OK] Database successfully rolled back to snapshot!');
            $this->info('');
            $this->line('The database has been restored to the snapshot state.');
            $this->warn('[WARNING]  You are still in migration mode with the same snapshot.');
            $this->info('');
            $this->line('Your options:');
            $this->line('   • Fix your migration files and run "php artisan migrate" to try again');
            $this->line('   • Run "php artisan migrate:commit" to exit migration mode');
            $this->info('');
            $this->line('The snapshot remains available for additional rollbacks if needed.');
            
            return 0;
            
        } catch (\Exception $e) {
            $this->error('[ERROR] Rollback failed: ' . $e->getMessage());
            $this->error('Manual intervention may be required!');

            // Try to restart MySQL
            $this->info('Attempting to restart MySQL...');
            $this->shell_exec_privileged('supervisorctl start mysql 2>&1');

            return 1;
        }
    }
    
    /**
     * Wait for MySQL to be ready for connections
     */
    protected function wait_for_mysql_ready(): void
    {
        $max_attempts = 120;
        $attempt = 0;
        
        while ($attempt < $max_attempts) {
            // Use mysql client to test connection (similar to user's approach)
            $result = shell_exec("echo \"SELECT 'test';\" | mysql -urspade -prspadepass 2>/dev/null | grep test");
            
            if ($result !== null && str_contains($result, 'test')) {
                return;
            }
            
            sleep(1);
            $attempt++;
        }
        
        throw new \Exception('MySQL did not start within 120 seconds');
    }
}