<?php
declare(strict_types=1);

namespace Esun\ContactPopup\Controller\Index;

use Esun\ContactPopup\Model\Submission;
use Esun\ContactPopup\Model\SubmissionFactory;
use Magento\Contact\Model\ConfigInterface;
use Magento\Contact\Model\MailInterface;
use Magento\Framework\App\Action\HttpPostActionInterface;
use Magento\Framework\App\RequestInterface;
use Magento\Framework\Controller\Result\Json;
use Magento\Framework\Controller\Result\JsonFactory;
use Magento\Framework\DataObject;
use Magento\Framework\Escaper;
use Psr\Log\LoggerInterface;

class Post implements HttpPostActionInterface
{
    private const ALLOWED_CATEGORIES = [
        'Product',
        'Technical support',
        'Cooperation',
        'Other',
    ];

    public function __construct(
        private readonly RequestInterface $request,
        private readonly JsonFactory $jsonFactory,
        private readonly ConfigInterface $contactsConfig,
        private readonly MailInterface $mail,
        private readonly SubmissionFactory $submissionFactory,
        private readonly Escaper $escaper,
        private readonly LoggerInterface $logger
    ) {
    }

    public function execute(): Json
    {
        $result = $this->jsonFactory->create();

        try {
            $data = $this->validateRequest();
            $submission = $this->saveSubmission($data);
        } catch (\Magento\Framework\Exception\LocalizedException $exception) {
            return $this->errorResult($result, $exception->getMessage(), 422);
        } catch (\Throwable $exception) {
            $this->logger->critical($exception);
            return $this->errorResult($result, __('Unable to save your message. Please try again later.'), 500);
        }

        $this->sendMail($submission, $data);

        return $result->setData([
            'success' => true,
            'message' => (string)__('Thanks for contacting us. We will respond to you as soon as possible.'),
        ]);
    }

    private function validateRequest(): array
    {
        $company = trim((string)$this->request->getParam('company', ''));
        $category = trim((string)$this->request->getParam('question_category', ''));
        $name = trim((string)$this->request->getParam('name', ''));
        $email = trim((string)$this->request->getParam('email', ''));
        $country = trim((string)$this->request->getParam('country', ''));
        $details = trim((string)$this->request->getParam('details', ''));

        if (trim((string)$this->request->getParam('hideit', '')) !== '') {
            throw new \Magento\Framework\Exception\LocalizedException(__('Unable to submit the form.'));
        }
        if (!in_array($category, self::ALLOWED_CATEGORIES, true)) {
            throw new \Magento\Framework\Exception\LocalizedException(__('Select a question category.'));
        }
        if ($name === '') {
            throw new \Magento\Framework\Exception\LocalizedException(__('Enter your name.'));
        }
        if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
            throw new \Magento\Framework\Exception\LocalizedException(__('Enter a valid email address.'));
        }
        if ($country === '') {
            throw new \Magento\Framework\Exception\LocalizedException(__('Enter your country.'));
        }
        if ($details === '') {
            throw new \Magento\Framework\Exception\LocalizedException(__('Enter the details.'));
        }
        if (
            mb_strlen($company) > 255 || mb_strlen($name) > 255 ||
            mb_strlen($email) > 255 || mb_strlen($country) > 255
        ) {
            throw new \Magento\Framework\Exception\LocalizedException(__('One or more fields are too long.'));
        }
        if (mb_strlen($details) > 5000) {
            throw new \Magento\Framework\Exception\LocalizedException(__('The details must not exceed 5000 characters.'));
        }

        return compact('company', 'category', 'name', 'email', 'country', 'details');
    }

    private function saveSubmission(array $data): Submission
    {
        $submission = $this->submissionFactory->create();
        $submission->setData([
            'company' => $data['company'],
            'question_category' => $data['category'],
            'name' => $data['name'],
            'email' => $data['email'],
            'country' => $data['country'],
            'details' => $data['details'],
            'mail_status' => 'pending',
        ]);
        $submission->save();
        return $submission;
    }

    private function sendMail(Submission $submission, array $data): void
    {
        if (!$this->contactsConfig->isEnabled()) {
            $submission->setData('mail_status', 'disabled')->save();
            return;
        }

        try {
            $this->mail->send($data['email'], ['data' => new DataObject($this->buildMailData($data))]);
            $submission->setData('mail_status', 'sent')->setData('mail_error', null)->save();
        } catch (\Throwable $exception) {
            $this->logger->critical($exception);
            try {
                $submission->setData('mail_status', 'failed')
                    ->setData('mail_error', mb_substr($exception->getMessage(), 0, 2000))
                    ->save();
            } catch (\Throwable $saveException) {
                $this->logger->critical($saveException);
            }
        }
    }

    private function buildMailData(array $data): array
    {
        $message = [
            $this->mailLine(__('Company Name'), $data['company'] !== '' ? $data['company'] : '-'),
            $this->mailLine(__('Question Category'), $data['category']),
            $this->mailLine(__('Country'), $data['country']),
            '',
            $this->escaper->escapeHtml((string)__('Details')) . ':<br>' .
                nl2br($this->escaper->escapeHtml($data['details']), false),
        ];

        return [
            'name' => $data['name'],
            'email' => $data['email'],
            'telephone' => '',
            'comment' => implode('<br>', $message),
        ];
    }

    private function mailLine(\Stringable|string $label, string $value): string
    {
        return $this->escaper->escapeHtml((string)$label) . ': ' . $this->escaper->escapeHtml($value);
    }

    private function errorResult(Json $result, \Stringable|string $message, int $statusCode): Json
    {
        $result->setHttpResponseCode($statusCode);
        return $result->setData([
            'success' => false,
            'message' => (string)$message,
        ]);
    }
}