/**
 * 受保护下载按钮：先换取短期令牌，再用令牌地址下载。
 *
 * 按钮由下载区模板输出，只携带随机 asset_key，不携带文件路径或公开 URL。
 *
 * @package Jio
 */
(function () {
  'use strict';

  var i18n = (window.jioData && window.jioData.protectedDownload) || {};
  var tokenUrl = i18n.tokenUrl || '';

  function toast(message, type) {
    if (typeof window.notyf === 'function') {
      window.notyf(message, type || 'danger');
    }
  }

  function message(data) {
    if (data && typeof data.message === 'string' && data.message !== '') {
      return data.message;
    }
    return i18n.error || '下载失败，请稍后重试';
  }

  function download(button) {
    var assetKey = button.getAttribute('data-jio-protected-asset') || '';
    var postId = button.getAttribute('data-jio-protected-post') || '';
    if (!assetKey || !postId || !tokenUrl) {
      return;
    }
    if (button.getAttribute('aria-busy') === 'true') {
      return;
    }
    button.setAttribute('aria-busy', 'true');

    var body = new URLSearchParams();
    body.set('post_id', postId);
    body.set('asset_key', assetKey);

    fetch(tokenUrl, {
      method: 'POST',
      credentials: 'same-origin',
      headers: {
        'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8',
        'X-WP-Nonce': (window.jioData && window.jioData.restNonce) || ''
      },
      body: body.toString()
    })
      .then(function (response) {
        return response.json().then(function (data) {
          return { ok: response.ok, data: data };
        });
      })
      .then(function (result) {
        if (!result.ok || !result.data || !result.data.url) {
          throw new Error(message(result.data));
        }
        window.location.href = result.data.url;
      })
      .catch(function (error) {
        toast(error && error.message ? error.message : (i18n.error || '下载失败，请稍后重试'));
      })
      .finally(function () {
        button.removeAttribute('aria-busy');
      });
  }

  document.addEventListener('click', function (event) {
    var button = event.target.closest('[data-jio-protected-asset]');
    if (!button) {
      return;
    }
    event.preventDefault();
    download(button);
  });
})();