<?php
if (!defined('SVRJS_MOD_DIRECTORY')) die;

$errorMessage = null;
$modEdited = false;

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
  if (!isset($_POST['_csrf']) || $_POST['_csrf'] != $_SESSION['csrf']) {
    $errorMessage = "Potential CSRF attack detected.";
  } elseif (!isset($_POST['name'], $_POST['category'], $_POST['link']) || !$_POST['name'] || !$_POST['category'] || !$_POST['link']) {
    $errorMessage = "You need to input name, category and download page URL.";
  } elseif (!filter_var($_POST['link'], FILTER_VALIDATE_URL) || !preg_match('/^https?:\\/\\//', $_POST['link'])) {
    $errorMessage = "Invalid download page URL.";
  } elseif (isset($_POST['docslink']) && $_POST['docslink'] && (!filter_var($_POST['docslink'], FILTER_VALIDATE_URL) || !preg_match('/^https?:\\/\\//', $_POST['docslink']))) {
    $errorMessage = "Invalid documentation URL.";
  } elseif (!filter_var($_POST['category'], FILTER_VALIDATE_INT)) {
    $errorMessage = "Invalid category.";
  } else {
    $categoryID = intval($_POST['category']);
    $statement = $connection->prepare("SELECT id FROM categories WHERE id = ?");
    if (!$statement) {
      $errorMessage = "An unexpected error occurred while editing the mod.";
    } else {
      $statement->bind_param('i', $categoryID);
      $statement->execute();
      $result = $statement->get_result();
      if (!$result) {
        $errorMessage = "An unexpected error occurred while editing the mod.";
        $statement->close();
      } else {
        $isCategoryPresent = boolval($result->fetch_assoc());
        $statement->close();
        if (!$isCategoryPresent) {
          $errorMessage = "The selected category doesn't exist.";
        } else {
          $fileError = false;
          $fileExtension = null;
          $modPendingUploadDirectory = APP_FSROOT . '/img/mods_pending';
          $modUploadDirectory = APP_FSROOT . '/img/mods';
          if (isset($_FILES['cover']) && $_FILES['cover']['error'] != UPLOAD_ERR_NO_FILE) {
            if ($_FILES['cover']['error'] != UPLOAD_ERR_OK) {
              $fileError = true;
              $errorMessage = "An unexpected error occurred while uploading the cover image.";
            } else {
              $fileTmpPath = $_FILES['cover']['tmp_name'];
              $fileName = $_FILES['cover']['name'];
              $fileSize = $_FILES['cover']['size'];
              $fileType = $_FILES['cover']['type'];
              $fileExtension = pathinfo($fileName, PATHINFO_EXTENSION);

              if ($fileSize > IMAGE_MAX_SIZE) {
                $fileError = true;
                $errorMessage = "The cover image is too large. Maximum cover image size: " . formatFileSize(IMAGE_MAX_SIZE);
              } elseif (!in_array($fileExtension, IMAGE_EXTENSIONS_ALLOWED, true)) {
                $fileError = true;
                $errorMessage = "Invalid cover image extension.";
              } else {
                $imageType = exif_imagetype($fileTmpPath);
                if (!$imageType || ($fileType && image_type_to_mime_type($imageType) != $fileType)) {
                  $fileError = true;
                  $errorMessage = "The cover image is either corrupted or of wrong type.";
                } else {
                  if (!file_exists($modPendingUploadDirectory) && !mkdir($modPendingUploadDirectory, 0777, true)) {
                    $fileError = true;
                    $errorMessage = "An unexpected error occurred while uploading the cover image.";
                  }
                  if (!$fileError) {
                    $uploadedCoverImagePathname = $modPendingUploadDirectory . '/' . str_replace(['/', '\\'], '', $modDataToEdit['slug']) . '.' . $fileExtension;
                    if (!move_uploaded_file($fileTmpPath, $uploadedCoverImagePathname)) {
                      $fileError = true;
                      $errorMessage = "An unexpected error occurred while uploading the cover image.";
                    }
                  }
                }
              }
            }
          } else {
            $fileExtension = $modDataToEdit['image_ext'] ? str_replace(['/', '\\'], '', $modDataToEdit['image_ext']) : null;
            $liveCoverImagePathname = $modUploadDirectory . '/' . str_replace(['/', '\\'], '', $modDataToEdit['slug']) . '.' . $fileExtension;
            if (file_exists($liveCoverImagePathname)) {
              if (!file_exists($modPendingUploadDirectory) && !mkdir($modPendingUploadDirectory, 0777, true)) {
                $fileError = true;
                $errorMessage = "An unexpected error occurred while copying the cover image.";
              }
              if (!$fileError) {
                $pendingCoverImagePathname = $modPendingUploadDirectory . '/' . str_replace(['/', '\\'], '', $modDataToEdit['slug']) . '.' . $fileExtension;
                if (!copy($liveCoverImagePathname, $pendingCoverImagePathname)) {
                  $fileError = true;
                  $errorMessage = "An unexpected error occurred while copying the cover image.";
                }
              }
            }
          }
          if (!$fileError) {
            $statement = $connection->prepare("REPLACE INTO mods_pending (
                id,
                name,
                slug,
                description,
                category,
                link,
                docs_link,
                user,
                image_ext,
                is_paid,
                is_rejected
              ) VALUES (
                ?,
                ?,
                ?,
                ?,
                ?,
                ?,
                ?,
                ?,
                ?,
                ?,
                0
              );");

            if (!$statement) {
              $errorMessage = "An unexpected error occurred while editing the mod.";
            } else {
              $modID = $modDataToEdit['pending'] ? $modDataToEdit['id'] : null;
              $modName = $_POST['name'];
              $modSlug = $modDataToEdit['slug'];
              $modDescription = isset($_POST['description']) && $_POST['description']  ? $_POST['description'] : null;
              $modCategory = $categoryID;
              $modLink = $_POST['link'];
              $modDocsLink = isset($_POST['docslink']) && $_POST['docslink'] ? $_POST['docslink'] : null;
              $modUser = $_SESSION['user'];
              $modImageExt = $fileExtension;
              $modIsPaid = isset($_POST['paid']) ? 1 : 0;
              $statement->bind_param('isssissisi', $modID, $modName, $modSlug, $modDescription, $modCategory, $modLink, $modDocsLink, $modUser, $modImageExt, $modIsPaid);
              if (!$statement->execute()) {
                $errorMessage = "An unexpected error occurred while editing the mod.";
                $statement->close();
              } else {
                $modEdited = true;
                $statement->close();
              }
            }
          }
        }
      }
    }
  }
}

if (!$modEdited) {
  $pageTitle = "Edit mod";
  $pageDescription = "Edit the SVR.JS mod in SVR.JS Mods directory.";
} else {
  $pageTitle = "Mod edited";
  $pageDescription = "The edited mod is now awaiting moderators' approval.";
}
include 'header.php';
?>
<main class="content">
  <?php if ($modEdited) { ?>
    <h1>Mod edited</h1>
    <p>The edited mod is now awaiting moderators' approval.</p>
    <p><a href="<?php echo htmlspecialchars((URL_REWRITTEN ? APP_ROOT : APP_ROOT . APP_FILENAME . '/') . 'pending-mods'); ?>" class="btn">View pending mods</a></p>
  <?php } else { ?>
    <h1>Edit mod</h1>
    <p><?php echo $modDataToEdit['pending'] ? 'You are editing the pending mod entry.' : 'You are editing the mod entry as it is displayed in the mod page.'; ?></p>
    <form action="<?php echo htmlspecialchars((URL_REWRITTEN ? APP_ROOT : APP_ROOT . APP_FILENAME . '/') . 'edit-mod/' . urlencode($modDataToEdit['slug'])) ?>" method="post" class="form" enctype="multipart/form-data">
      <div class="form-block">
        <label for="name">Mod name:</label>
        <input type="text" id="name" name="name" required maxlength="255" value="<?php echo htmlspecialchars($modDataToEdit['name']); ?>">
      </div>
      <div class="form-block">
        <label for="cover">Cover image:</label>
        <input type="file" id="cover" name="cover" accept="<?php echo htmlspecialchars(implode(',', array_map(
                                                              function ($extension) {
                                                                return '.' . $extension;
                                                              },
                                                              IMAGE_EXTENSIONS_ALLOWED
                                                            ))) ?>">
        <p>Allowed file extensions for the cover image: <strong><?php echo htmlspecialchars(implode(', ', array_map(
                                                                  function ($extension) {
                                                                    return '.' . $extension;
                                                                  },
                                                                  IMAGE_EXTENSIONS_ALLOWED
                                                                ))) ?></strong></p>
      </div>
      <div class="form-block">
        <label for="category">Category:</label>
        <select id="category" name="category" required>
          <?php
          $result = $connection->query('SELECT id, name FROM categories');
          if ($result) {
            while ($row = $result->fetch_assoc()) {
              echo '<option value="' . htmlspecialchars(number_format($row['id'], 0)) . '"' . ($row['id'] == $modDataToEdit['category_id'] ? ' selected' : '') . '>' . htmlspecialchars($row['name']) . '</option>';
            }
          }
          ?>
        </select>
      </div>
      <div class="form-block">
        <label for="description">Mod description:</label>
        <textarea name="description" id="description" maxlength="10000"><?php echo htmlspecialchars(isset($modDataToEdit['description']) ? $modDataToEdit['description'] : ""); ?></textarea>
      </div>
      <div class="form-block">
        <label for="link">Download page URL:</label>
        <input type="url" id="link" name="link" required maxlength="255" value="<?php echo htmlspecialchars($modDataToEdit['link']); ?>">
      </div>
      <div class="form-block">
        <label for="docslink">Documentation URL:</label>
        <input type="url" id="docslink" name="docslink" maxlength="255" value="<?php echo htmlspecialchars(isset($modDataToEdit['docs_link']) ? $modDataToEdit['docs_link'] : ""); ?>">
      </div>
      <div class="form-block-checkbox">
        <input type="checkbox" name="paid" id="paid" <?php echo $modDataToEdit['is_paid'] ? 'checked' : '' ?>>
        <label for="paid">Paid?</label>
      </div>

      <?php if ($errorMessage) echo '<p class="form-error">' . htmlspecialchars($errorMessage) . '</p>'; ?>
      <div class="form-block">
        <input type="submit" value="Edit mod">
      </div>
      <input type="hidden" name="_csrf" value="<?php echo htmlspecialchars($_SESSION['csrf']) ?>">
    </form>
  <?php } ?>
</main>
<?php
include 'footer.php';

if ($modEdited) {
  $moderatorResult = $connection->query("SELECT email AS address, username AS name FROM users WHERE is_moderator = 1;");
  if ($moderatorResult) {
    $moderators = [];
    while ($moderator = $moderatorResult->fetch_assoc()) {
      array_push($moderators, $moderator);
    }
    sendEmail($moderators, 'A mod has been edited that requires approval', "A mod has been edited that requires approval:\n\nMod name: " . str_replace(["\r\n", "\r", "\n"], '', $_POST['name']) . "\nSlug: " . $modDataToEdit['slug'] . "\n\nPlease review the mod and approve or reject it.");
  }
}
?>