<?php

namespace App\Services\Events;

use App\Services\Billing\PlatformEmailClient;
use App\Services\Messaging\CustomerEmailClient;
use App\Services\Messaging\MessagingCredentialsService;
use App\Support\AccountBranding;

/**
 * Attendee/speaker email: prefer platform suite messaging (zero-config mailbox),
 * fall back to customer Bird credentials when suite is unavailable.
 */
class EventMailer
{
    private ?string $lastError = null;

    public function __construct(
        private readonly MessagingCredentialsService $credentials,
        private readonly CustomerEmailClient $customerEmail,
        private readonly PlatformEmailClient $platformEmail,
    ) {}

    public function lastError(): ?string
    {
        return $this->lastError;
    }

    public function isConfiguredForOwner(string $ownerPublicId): bool
    {
        if ($this->platformEmail->isConfigured()) {
            return true;
        }

        return $this->credentials->forOwner($ownerPublicId)->hasValidBird();
    }

    /** @deprecated Use isConfiguredForOwner() */
    public function isConfigured(): bool
    {
        return $this->platformEmail->isConfigured();
    }

    public function send(
        string $ownerPublicId,
        string $to,
        string $subject,
        string $html,
        ?string $text = null,
        ?string $replyToEmail = null,
        ?string $replyToName = null,
        ?string $fromName = null,
    ): bool {
        $this->lastError = null;
        $displayName = $this->resolveFromName($ownerPublicId, $fromName, $replyToName);

        if ($this->platformEmail->isConfigured()) {
            $sent = $this->platformEmail->send($ownerPublicId, $to, $subject, $html, $text, $displayName);
            if ($sent) {
                return true;
            }

            // Suite unavailable (mailbox, allowance) — try Bird power-user path next.
            $suiteError = $this->platformEmail->lastError();
            if ($this->tryCustomerBird($ownerPublicId, $to, $subject, $html, $text, $displayName)) {
                return true;
            }

            $this->lastError = $suiteError ?: $this->lastError;

            return false;
        }

        return $this->tryCustomerBird($ownerPublicId, $to, $subject, $html, $text, $displayName);
    }

    private function resolveFromName(string $ownerPublicId, ?string $fromName, ?string $replyToName): ?string
    {
        foreach ([$fromName, $replyToName] as $candidate) {
            $name = trim((string) $candidate);
            if ($name !== '') {
                return $name;
            }
        }

        $settings = AccountBranding::forOwnerRef($ownerPublicId);
        $company = trim(AccountBranding::companyName($settings));

        return $company !== '' && strcasecmp($company, 'Company') !== 0 ? $company : null;
    }

    private function tryCustomerBird(
        string $ownerPublicId,
        string $to,
        string $subject,
        string $html,
        ?string $text,
        ?string $fromName = null,
    ): bool {
        $credential = $this->credentials->forOwner($ownerPublicId);
        if (! $credential->hasValidBird()) {
            $this->lastError ??= 'Connect a Ladill mailbox in Account → Messaging, or connect Ladill Bird in Integrations.';

            return false;
        }

        $apiKey = $credential->birdApiKey();
        if (! $apiKey) {
            $this->lastError = 'Bird credentials could not be decrypted. Reconnect Bird in Integrations.';

            return false;
        }

        $sent = $this->customerEmail->send(
            $apiKey,
            (string) $credential->bird_from_email,
            $credential->bird_from_name ?: $fromName,
            $to,
            $subject,
            $html,
            $text,
        );

        if (! $sent) {
            $this->lastError = $this->customerEmail->lastError() ?: 'The email could not be sent.';

            return false;
        }

        return true;
    }
}