<?php

namespace App\Domains\Integration\Services;

use App\Domains\Tenant\Models\Tenant;
use Exception;
use Illuminate\Contracts\Mail\Factory as MailFactory;
use Illuminate\Contracts\Mail\Mailer;
use Illuminate\Mail\Mailable;
use Illuminate\Mail\MailManager;
use Illuminate\Support\Facades\Blade;
use InvalidArgumentException;

class MailService extends BaseIntegrationService
{
    private const REQUIRED_SMTP_FIELDS = [
        'MAIL_HOST',
        'MAIL_PORT',
        'MAIL_USERNAME',
        'MAIL_PASSWORD',
        'MAIL_FROM_ADDRESS',
    ];

    protected string $integrationCode = 'email';

    private readonly MailFactory $mailFactory;

    private ?Mailer $mailer = null;

    private ?Tenant $tenant = null;

    private bool $usesTenantMailer = false;

    public function __construct(?MailFactory $mailFactory = null)
    {
        $this->mailFactory = $mailFactory ?? app(MailFactory::class);
    }

    public function forTenant(string $tenantCode): self
    {
        parent::forTenant($tenantCode);

        $this->tenant = Tenant::query()
            ->where('codigo', $tenantCode)
            ->firstOrFail();

        if ($this->tenantIntegration) {
            $this->mailer = $this->resolveMailer();
            $this->usesTenantMailer = true;
        } else {
            $this->mailer = $this->mailFactory->mailer();
            $this->usesTenantMailer = false;
        }

        return $this;
    }

    public function getHeaders(): array
    {
        return [];
    }

    public function send(string|array $recipient, string $subject, string $content): void
    {
        if (! $this->mailer || ! $this->tenant) {
            throw new Exception('MailService no está configurado. Llamá a forTenant() primero.');
        }

        $this->tenant->loadMissing(['headerLogo', 'footerLogo']);

        $html = Blade::render(
            <<<'BLADE'
                <x-mail.branded-layout :tenant="$tenant" :header-logo-url="$headerLogoUrl" :footer-logo-url="$footerLogoUrl">
                    {!! $content !!}
                </x-mail.branded-layout>
                BLADE,
            [
                'tenant' => $this->tenant,
                'headerLogoUrl' => $this->tenant->headerLogo?->getTemporaryUrl(1440),
                'footerLogoUrl' => $this->tenant->footerLogo?->getTemporaryUrl(1440),
                'content' => $content,
            ],
        );

        $mail = (new Mailable)
            ->subject($subject)
            ->html($html);

        $this->mailer->to($recipient)->send($mail);
    }

    public function mailerName(): string
    {
        return $this->usesTenantMailer
            ? 'tenant-smtp'
            : (string) config('mail.default');
    }

    public function onSetup(): void
    {
        if (! $this->tenant) {
            throw new Exception('MailService no está configurado. Llamá a forTenant() primero.');
        }

        $recipient = $this->getIntegrationSetting('MAIL_FROM_ADDRESS');

        if (! is_string($recipient) || $recipient === '') {
            throw new InvalidArgumentException('Falta MAIL_FROM_ADDRESS en la configuración SMTP del tenant.');
        }

        $this->send(
            $recipient,
            'Configuración de correo validada',
            '<h1 style="margin: 0 0 20px;">Configuración de correo validada</h1>'
                .'<p>La integración SMTP de '.e($this->tenant->nombre).' fue configurada correctamente.</p>'
                .'<p style="color: #64748b; font-size: 13px;">Este mensaje fue enviado automáticamente para validar las credenciales de correo.</p>',
        );
    }

    private function resolveMailer(): Mailer
    {
        $data = $this->tenantIntegration?->integration_data;

        if (! is_array($data)) {
            throw new InvalidArgumentException('La configuración SMTP del tenant no es válida.');
        }

        foreach (self::REQUIRED_SMTP_FIELDS as $field) {
            if (! array_key_exists($field, $data) || $data[$field] === null || $data[$field] === '') {
                throw new InvalidArgumentException("Falta {$field} en la configuración SMTP del tenant.");
            }
        }

        // MailFake implements MailFactory but cannot build transports.
        if (! $this->mailFactory instanceof MailManager) {
            return $this->mailFactory->mailer();
        }

        $mailer = $this->mailFactory->build([
            'name' => "tenant-smtp-{$this->tenantCode}",
            'transport' => 'smtp',
            'scheme' => $data['MAIL_SCHEME'] ?? null,
            'host' => $data['MAIL_HOST'],
            'port' => (int) $data['MAIL_PORT'],
            'username' => $data['MAIL_USERNAME'],
            'password' => $data['MAIL_PASSWORD'],
            'timeout' => isset($data['MAIL_TIMEOUT']) ? (int) $data['MAIL_TIMEOUT'] : null,
            'local_domain' => $data['MAIL_EHLO_DOMAIN'] ?? null,
        ]);

        $mailer->alwaysFrom(
            $data['MAIL_FROM_ADDRESS'],
            $data['MAIL_FROM_NAME'] ?? $this->tenant?->nombre,
        );

        return $mailer;
    }
}
