<?php

namespace App\Services;

use App\Models\Addon;
use Illuminate\Support\Facades\Mail;

/**
 * Sends e-mail notifications via the user's SMTP add-on. The SMTP settings live (encrypted) on the
 * addon row; we configure a runtime mailer from them so no .env editing is needed. Each event type
 * is individually toggleable, so the user controls exactly what they get mailed about.
 */
class NotificationService
{
    /** @return array<string,mixed>|null */
    public function config(): ?array
    {
        return Addon::where('key', 'smtp')->where('installed', true)->first()?->config;
    }

    public function eventEnabled(string $event): bool
    {
        return (bool) data_get($this->config(), "events.{$event}", false);
    }

    /** Send only if the SMTP add-on is set up AND this event type is enabled. */
    public function notify(string $event, string $subject, string $body): bool
    {
        if (! $this->eventEnabled($event)) {
            return false;
        }

        return $this->send($subject, $body);
    }

    /** Send unconditionally (used by the "send test" button). Returns success, never throws. */
    public function send(string $subject, string $body): bool
    {
        $cfg = $this->config();
        if ($cfg === null || blank($cfg['to_email'] ?? null) || blank($cfg['host'] ?? null)) {
            return false;
        }

        $this->configureMailer($cfg);

        try {
            Mail::mailer('homeos_smtp')->raw($body, function ($message) use ($cfg) {
                $message->to($cfg['to_email'])
                    ->subject('[HomeOS] '.$subject)
                    ->from($cfg['from_email'] ?: 'homeos@localhost', $cfg['from_name'] ?: 'HomeOS');
            });
        } catch (\Throwable $e) {
            // A transient SMTP failure must not abort the caller (a sweep over many devices, an
            // automation run). Log and report failure so the loop keeps going.
            report($e);

            return false;
        }

        return true;
    }

    /** @param  array<string,mixed>  $cfg */
    private function configureMailer(array $cfg): void
    {
        config(['mail.mailers.homeos_smtp' => [
            'transport' => 'smtp',
            'host' => $cfg['host'],
            'port' => (int) ($cfg['port'] ?? 587),
            'encryption' => ($cfg['encryption'] ?? '') ?: null,
            'username' => ($cfg['username'] ?? '') ?: null,
            'password' => ($cfg['password'] ?? '') ?: null,
            'timeout' => 10,
        ]]);

        // MailManager caches the resolved mailer by name; purge it so a long-running worker
        // (Horizon) picks up config changes instead of reusing the first mailer it built.
        Mail::purge('homeos_smtp');
    }
}