<?php declare(strict_types = 1);

namespace MailPoet\API\MP\v1;

if (!defined('ABSPATH')) exit;


use MailPoet\Entities\SegmentEntity;
use MailPoet\Form\FormsRepository;
use MailPoet\Newsletter\Segment\NewsletterSegmentRepository;
use MailPoet\Segments\SegmentsRepository;

class Segments {
  private const DATE_FORMAT = 'Y-m-d H:i:s';

  /** @var NewsletterSegmentRepository */
  private $newsletterSegmentRepository;

  /** @var FormsRepository */
  private $formsRepository;

  /** @var SegmentsRepository */
  private $segmentsRepository;

  public function __construct (
    NewsletterSegmentRepository $newsletterSegmentRepository,
    FormsRepository $formsRepository,
    SegmentsRepository $segmentsRepository
  ) {
    $this->newsletterSegmentRepository = $newsletterSegmentRepository;
    $this->formsRepository = $formsRepository;
    $this->segmentsRepository = $segmentsRepository;
  }

  public function getAll(): array {
    $segments = $this->segmentsRepository->findBy(['type' => SegmentEntity::TYPE_DEFAULT], ['id' => 'asc']);
    $result = [];
    foreach ($segments as $segment) {
      $result[] = $this->buildItem($segment);
    }
    return $result;
  }

  public function addList(array $data): array {
    $this->validateSegmentName($data);

    try {
      $name = isset($data['name']) ? sanitize_text_field($data['name']) : '';
      $description = isset($data['description']) ? sanitize_textarea_field($data['description']) : '';
      $segment = $this->segmentsRepository->createOrUpdate($name, $description);
    } catch (\Exception $e) {
      throw new APIException(
        __('The list couldn’t be created in the database', 'mailpoet'),
        APIException::FAILED_TO_SAVE_LIST
      );
    }

    return $this->buildItem($segment);
  }

  public function updateList(array $data): array {
    // firstly validation on list id
    $this->validateSegmentId((string)($data['id'] ?? ''));

    // secondly validation on list name
    $this->validateSegmentName($data);

    // update is supported only for default segment type
    $this->validateSegmentType((string)$data['id']);

    $name = isset($data['name']) ? sanitize_text_field($data['name']) : '';
    $description = isset($data['description']) ? sanitize_textarea_field($data['description']) : '';

    try {
      $segment = $this->segmentsRepository->createOrUpdate(
        $name,
        $description,
        SegmentEntity::TYPE_DEFAULT,
        [],
        (int)$data['id']
      );
    } catch (\Exception $e) {
      throw new APIException(
        __('The list couldn’t be updated in the database', 'mailpoet'),
        APIException::FAILED_TO_UPDATE_LIST
      );
    }

    return $this->buildItem($segment);
  }

  public function deleteList(string $listId): bool {
    $this->validateSegmentId($listId);

    // delete is supported only for default segment type
    $this->validateSegmentType($listId);

    $activelyUsedNewslettersSubjects = $this->newsletterSegmentRepository->getSubjectsOfActivelyUsedEmailsForSegments([$listId]);
    if (isset($activelyUsedNewslettersSubjects[$listId])) {
      throw new APIException(
        str_replace(
          '%1$s',
          "'" . join("', '", $activelyUsedNewslettersSubjects[$listId]) . "'",
          // translators: %1$s is a comma-separated list of emails for which the segment is used.
          _x('List cannot be deleted because it’s used for %1$s email', 'Alert shown when trying to delete segment, which is assigned to any automatic emails.', 'mailpoet')
        ),
        APIException::LIST_USED_IN_EMAIL
      );
    }

    $activelyUsedFormNames = $this->formsRepository->getNamesOfFormsForSegments();
    if (isset($activelyUsedFormNames[$listId])) {
      throw new APIException(
        str_replace(
          '%1$s',
          "'" . join("', '", $activelyUsedFormNames[$listId]) . "'",
          // translators: %1$s is a comma-separated list of forms for which the segment is used.
          _nx(
            'List cannot be deleted because it’s used for %1$s form',
            'List cannot be deleted because it’s used for %1$s forms',
            count($activelyUsedFormNames[$listId]),
            'Alert shown when trying to delete segment, when it is assigned to a form.',
            'mailpoet'
          )
        ),
        APIException::LIST_USED_IN_FORM
      );
    }

    try {
      $this->segmentsRepository->bulkDelete([$listId]);
      return true;
    } catch (\Exception $e) {
      throw new APIException(
        __('The list couldn’t be deleted from the database', 'mailpoet'),
        APIException::FAILED_TO_DELETE_LIST
      );
    }
  }

  private function validateSegmentId(string $segmentId): void {
    if (empty($segmentId)) {
      throw new APIException(
        __('List id is required.', 'mailpoet'),
        APIException::LIST_ID_REQUIRED
      );
    }

    if (!$this->segmentsRepository->findOneById($segmentId)) {
      throw new APIException(
        __('The list does not exist.', 'mailpoet'),
        APIException::LIST_NOT_EXISTS
      );
    }
  }

  /**
   * Throws an exception when the segment's name is invalid.
   * Validates against the sanitized name so whitespace-only inputs that
   * collapse to empty after sanitize_text_field() are rejected up front
   * instead of being silently saved as an empty list name.
   * @return void
   */
  private function validateSegmentName(array $data): void {
    $name = isset($data['name']) && is_string($data['name']) ? sanitize_text_field($data['name']) : '';
    if ($name === '') {
      throw new APIException(
        __('List name is required.', 'mailpoet'),
        APIException::LIST_NAME_REQUIRED
      );
    }

    $segmentId = isset($data['id']) ? (int)$data['id'] : null;
    if (!$this->segmentsRepository->isNameUnique($name, $segmentId)) {
      throw new APIException(
        __('This list already exists.', 'mailpoet'),
        APIException::LIST_EXISTS
      );
    }
  }

  private function validateSegmentType(string $segmentId): void {
    $segment = $this->segmentsRepository->findOneById($segmentId);
    if ($segment && $segment->getType() !== SegmentEntity::TYPE_DEFAULT) {
      throw new APIException(
        str_replace(
          '%1$s',
          "'" . $segment->getType() . "'",
          // translators: %1$s is an invalid segment type.
          __('List of the type %1$s is not supported for this action.', 'mailpoet')
        ),
        APIException::LIST_TYPE_IS_NOT_SUPPORTED
      );
    }
  }

  /**
   * @param SegmentEntity $segment
   * @return array
   */
  private function buildItem(SegmentEntity $segment): array {
    return [
      'id' => (string)$segment->getId(), // (string) for BC
      'name' => $segment->getName(),
      'type' => $segment->getType(),
      'description' => $segment->getDescription(),
      'created_at' => ($createdAt = $segment->getCreatedAt()) ? $createdAt->format(self::DATE_FORMAT) : null,
      'updated_at' => ($updatedAt = $segment->getUpdatedAt()) ? $updatedAt->format(self::DATE_FORMAT) : null,
      'deleted_at' => ($deletedAt = $segment->getDeletedAt()) ? $deletedAt->format(self::DATE_FORMAT) : null,
    ];
  }
}
