// Helper functions used in web-bundle tests.

function addElementAndWaitForLoad(element) {
  return new Promise((resolve, reject) => {
    element.onload = () => resolve(element);
    element.onerror = () => reject(element);
    document.body.appendChild(element);
  });
}

function addElementAndWaitForError(element) {
  return new Promise((resolve, reject) => {
    element.onload = () => reject(element);
    element.onerror = () => resolve(element);
    document.body.appendChild(element);
  });
}

// Evaluates |code| in |iframe|. The following message event handler must be
// registered on the iframe page:
//   window.addEventListener(
//       'message',
//       (e) => { e.source.postMessage(eval(e.data), e.origin); });
function evalInIframe(iframe, code) {
  const message_promise = new Promise((resolve) => {
      window.addEventListener(
          'message',
          (e) => { resolve(e.data); },
          { once : true });
    });
  iframe.contentWindow.postMessage(code,'*');
  return message_promise;
}

function fetchAndWaitForReject(url) {
  return new Promise((resolve, reject) => {
    fetch(url)
      .then(() => {
        reject();
      })
      .catch(() => {
        resolve();
      });
  });
}

function isValidCrossOriginAttribute(crossorigin) {
  if (crossorigin === undefined)
    return true;
  if ((typeof crossorigin) != 'string')
    return false;
  const lower_crossorigin = crossorigin.toLowerCase();
  return (lower_crossorigin === 'anonymous') ||
         (lower_crossorigin  === 'use-credentials');
}

function addLinkAndWaitForLoad(url, resources, crossorigin) {
  return new Promise((resolve, reject) => {
    if (!isValidCrossOriginAttribute(crossorigin)) {
      reject('invalid crossorigin attribute: ' + crossorigin);
      return;
    }
    const link = document.createElement("link");
    link.rel = "webbundle";
    link.href = url;
    if (crossorigin) {
      link.crossOrigin = crossorigin;
    }
    for (const resource of resources) {
      link.resources.add(resource);
    }
    link.onload = () => resolve(link);
    link.onerror = () => reject(link);
    document.body.appendChild(link);
  });
}

function addLinkAndWaitForError(url, resources, crossorigin) {
  return new Promise((resolve, reject) => {
    if (!isValidCrossOriginAttribute(crossorigin)) {
      reject('invalid crossorigin attribute: ' + crossorigin);
      return;
    }
    const link = document.createElement("link");
    link.rel = "webbundle";
    link.href = url;
    if (crossorigin) {
      link.crossOrigin = crossorigin;
    }
    for (const resource of resources) {
      link.resources.add(resource);
    }
    link.onload = () => reject(link);
    link.onerror = () => resolve(link);
    document.body.appendChild(link);
  });
}

function addScriptAndWaitForError(url) {
  return new Promise((resolve, reject) => {
    const script = document.createElement("script");
    script.src = url;
    script.onload = reject;
    script.onerror = resolve;
    document.body.appendChild(script);
  });
}

function addScriptAndWaitForExecution(url) {
  return new Promise((resolve, reject) => {
    window.scriptLoaded = (val) => {
      window.scriptLoaded = undefined;
      resolve(val);
    };
    const script = document.createElement("script");
    script.src = url;
    script.onerror = reject;
    document.body.appendChild(script);
  });
}

// Currnetly Chrome supports two element types for Subresource Web Bundles
// feature, <link rel=webbundle> and <script type=webbundle>.
// In order to use the same test js file for the two types, we use
// window.TEST_WEB_BUNDLE_ELEMENT_TYPE. When 'link' is set,
// createWebBundleElement() will create a <link rel=webbundle> element, and when
// 'script' is set, createWebBundleElement() will create a <script
// rel=webbundle> element.
function isTestBundleElementTypeSet() {
  return (window.TEST_WEB_BUNDLE_ELEMENT_TYPE == 'link') ||
         (window.TEST_WEB_BUNDLE_ELEMENT_TYPE == 'script');
}

function createWebBundleElement(url, resources, options) {
  if (!isTestBundleElementTypeSet()) {
    throw new Error(
        'window.TEST_WEB_BUNDLE_ELEMENT_TYPE is not correctly set: ' +
        window.TEST_WEB_BUNDLE_ELEMENT_TYPE);
  }
  if (window.TEST_WEB_BUNDLE_ELEMENT_TYPE == 'link') {
    const link = document.createElement("link");
    link.rel = "webbundle";
    link.href = url;
    if (options) {
      if (options.crossOrigin) {
        link.crossOrigin = options.crossOrigin;
      }
      if (options.scopes) {
        for (const scope of options.scopes) {
          link.scopes.add(scope);
        }
      }
    }
    for (const resource of resources) {
      link.resources.add(resource);
    }
    return link;
  }
  const script = document.createElement("script");
  script.type = "webbundle";
  const json_rule  = {"source": url, "resources": resources};
  if (options && options.scopes) {
    json_rule.scopes = options.scopes;
  }
  if (options && options.credentials) {
    json_rule.credentials = options.credentials;
  }
  script.textContent = JSON.stringify(json_rule);
  return script;
}

function addWebBundleElementAndWaitForLoad(url, resources, options) {
  const element = createWebBundleElement(url, resources, options);
  return addElementAndWaitForLoad(element);
}

function addWebBundleElementAndWaitForError(url, resources, options) {
  const element = createWebBundleElement(url, resources, options);
  return addElementAndWaitForError(element);
}

function changeWebBundleUrlInPlace(element, new_url) {
  if (window.TEST_WEB_BUNDLE_ELEMENT_TYPE != 'link') {
    throw new Error(
        'Changing the URL of web bundle is not supported for : ' +
        window.TEST_WEB_BUNDLE_ELEMENT_TYPE);
  }
  element.href= new_url;
}

function changeWebBundleScopesInPlace(element, scopes) {
  if (window.TEST_WEB_BUNDLE_ELEMENT_TYPE != 'link') {
    throw new Error(
        'Changing the scopes of web bundle is not supported for : ' +
        window.TEST_WEB_BUNDLE_ELEMENT_TYPE);
  }
  element.scopes = '';
  for (const scope of scopes) {
    element.scopes.add(scope);
  }
}

function changeWebBundleResourcesInPlace(element, resources) {
  if (window.TEST_WEB_BUNDLE_ELEMENT_TYPE != 'link') {
    throw new Error(
        'Changing the resources of web bundle is not supported for : ' +
        window.TEST_WEB_BUNDLE_ELEMENT_TYPE);
  }
  element.resources = '';
  for (const url of resources) {
    element.resources.add(url);
  }
}

// This function creates a new WebBundle element that has a rule
// constructed in accordance with a JSON object |new_rule|:
// 1. Copy over WebBundle rules from an existing element that are
// not present in |new_rule|, in case of <link> API it is all
// relevant attributes: href, resources, scopes and crossOrigin;
// in case of <script> API, it is: source, resources, scopes and
// credentials.
// 2. Then create a new WebBundle element from |new_rule| (that now
// has full information required after 1.) and return it.
function createNewWebBundleElementWithUpdatedRule(element, new_rule) {
  if (window.TEST_WEB_BUNDLE_ELEMENT_TYPE == 'link') {
    if (element.resources && !new_rule.resources)
      new_rule.resources = Array.from(element.resources);
    if (element.scopes && !new_rule.scopes)
      new_rule.scopes = Array.from(element.scopes);
    if (element.crossOrigin && !new_rule.crossOrigin)
      new_rule.crossOrigin = element.crossOrigin;
    if (!new_rule.url)
      new_rule.url = element.href;
  } else {
    const rule = JSON.parse(element.textContent);
    if (rule.resources && !new_rule.resources)
      new_rule.resources = rule.resources;
    if (rule.scopes && !new_rule.scopes)
      new_rule.scopes = rule.scopes;
    if (rule.credentials && !new_rule.credentials)
      new_rule.credentials = rule.credentials;
    if (!new_rule.url)
      new_rule.url = rule.source;
  }

  return createWebBundleElement(new_rule.url, new_rule.resources, new_rule);
}