<?php

declare(strict_types=1);

namespace App\Jobs\VirtualMachine\Create;

use App\Http\Facade\SignRSA;
use App\Jobs\Mail\SendInformationVirtualMachine;
use App\Models\ModuleVmware;
use App\Models\Setting;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
use Illuminate\Support\Facades\Log;

class ChangePasswordViaSshJob implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    public int $tries   = 3;
    public int $backoff = 120;

    public function __construct(
        public readonly int    $moduleVmwareId,
        public readonly string $ip,
        public readonly string $username,
        public readonly string $initialPassword,
        public readonly string $newPassword,
    ) {}

    // ─────────────────────────────────────────────────────────────────────────

    public function handle(): void
    {
        Log::info('ChangePasswordViaSshJob: starting', [
            'module_vmware_id' => $this->moduleVmwareId,
            'ip'               => $this->ip,
            'username'         => $this->username,
        ]);

        $output = $this->runWithRetry();

        if ($output === null) {
            $this->fail(new \RuntimeException(
                "SSH connection to {$this->ip} failed after max attempts"
            ));
            return;
        }

        Log::info('ChangePasswordViaSshJob: chpasswd output', [
            'module_vmware_id' => $this->moduleVmwareId,
            'output'           => trim($output),
        ]);

        // Update DB
        $vm = ModuleVmware::find($this->moduleVmwareId);

        if (!$vm) {
            Log::error('ChangePasswordViaSshJob: ModuleVmware not found', [
                'module_vmware_id' => $this->moduleVmwareId,
            ]);
            return;
        }

        $vm->update([
            'password'       => SignRSA::EncryptFunc($this->newPassword),
            'plain_password' => $this->newPassword,
        ]);

        $this->sendPasswordEmail($vm);
    }

    // ─────────────────────────────────────────────────────────────────────────

    /**
     * Run chpasswd on the remote VM via sshpass + native SSH.
     * Retries up to 10 times with 30 s delay (VM may still be booting).
     */
    private function runWithRetry(int $maxAttempts = 10, int $sleepSeconds = 30): ?string
    {
        // Remote bash command: echo 'user:pass' | chpasswd
        $credential = $this->username . ':' . $this->newPassword;
        $remoteCmd  = 'echo ' . escapeshellarg($credential) . ' | chpasswd 2>&1';

        $sshCmd = sprintf(
            'sshpass -p %s ssh -o StrictHostKeyChecking=no -o ConnectTimeout=10 -p 22 %s@%s %s 2>&1',
            escapeshellarg($this->initialPassword),
            escapeshellarg($this->username),
            escapeshellarg($this->ip),
            escapeshellarg($remoteCmd),
        );

        for ($attempt = 1; $attempt <= $maxAttempts; $attempt++) {
            $output = shell_exec($sshCmd);

            // null = shell_exec failed (command not found, etc.)
            // sshpass exits non-zero on connection failure → output contains error text
            if ($output !== null && !$this->isSshConnectionError($output)) {
                Log::info('ChangePasswordViaSshJob: SSH connected', [
                    'module_vmware_id' => $this->moduleVmwareId,
                    'attempt'          => $attempt,
                ]);
                return $output;
            }

            Log::warning('ChangePasswordViaSshJob: SSH not ready, retrying', [
                'module_vmware_id' => $this->moduleVmwareId,
                'attempt'          => $attempt,
                'output_preview'   => substr((string) $output, 0, 200),
            ]);

            if ($attempt < $maxAttempts) {
                sleep($sleepSeconds);
            }
        }

        return null;
    }

    /**
     * Detect SSH connection failures (not auth errors) in sshpass output.
     */
    private function isSshConnectionError(string $output): bool
    {
        $lower = strtolower($output);

        return str_contains($lower, 'connection refused')
            || str_contains($lower, 'no route to host')
            || str_contains($lower, 'connection timed out')
            || str_contains($lower, 'host is down')
            || str_contains($lower, 'network is unreachable');
    }

    // ─────────────────────────────────────────────────────────────────────────

    public function failed(\Throwable $e): void
    {
        Log::error('ChangePasswordViaSshJob: failed', [
            'module_vmware_id' => $this->moduleVmwareId,
            'ip'               => $this->ip,
            'error'            => $e->getMessage(),
        ]);
    }

    // ─────────────────────────────────────────────────────────────────────────

    private function sendPasswordEmail(ModuleVmware $vm): void
    {
        try {
            $customer = $vm->customer;

            if (!$customer) {
                Log::error('ChangePasswordViaSshJob: customer not found', [
                    'module_vmware_id' => $this->moduleVmwareId,
                ]);
                return;
            }

            $setting      = Setting::where('key', 'setting')->first();
            $settingValue = $setting ? json_decode((string) $setting->value) : null;

            $emailData = [
                'company_name'     => $settingValue->company ?? 'Thế Giới Số',
                'company_logo'     => $settingValue->logo    ?? '',
                'client_name'      => trim($customer->firstname . ' ' . $customer->lastname),
                'product_name'     => 'Cloud VPS',
                'product_billing'  => 'N/A',
                'product_price'    => 'N/A',
                'service_host'     => $this->ip,
                'service_username' => $this->username,
                'service_port'     => 22,
                'service_password' => $this->newPassword,
                'os_name'          => ($vm->os?->osGroup?->name ?? '') . ' ' . ($vm->os?->version ?? ''),
                'service_due_exp'  => $vm->next_due_date ? date('d/m/Y', (int) $vm->next_due_date) : 'N/A',
            ];

            SendInformationVirtualMachine::dispatch($emailData, $customer)
                ->delay(now()->addSeconds(5));

            Log::info('ChangePasswordViaSshJob: email dispatched', [
                'module_vmware_id' => $this->moduleVmwareId,
                'customer_email'   => $customer->email,
            ]);
        } catch (\Throwable $e) {
            Log::error('ChangePasswordViaSshJob: email failed: ' . $e->getMessage(), [
                'module_vmware_id' => $this->moduleVmwareId,
            ]);
        }
    }
}