/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

var AboutTabCrashed = {
  /**
   * This can be set to true once this page receives a message from the
   * parent saying whether or not a crash report is available.
   */
  hasReport: false,

  /**
   * The messages that we might receive from the parent.
   */
  MESSAGES: ["SetCrashReportAvailable", "CrashReportSent", "UpdateCount"],

  /**
   * Items for which we will listen for click events.
   */
  CLICK_TARGETS: ["closeTab", "restoreTab", "restoreAll", "sendReport"],

  /**
   * Returns information about this crashed tab.
   *
   * @return (Object) An object with the following properties:
   *           title (String):
   *             The title of the page that crashed.
   *           URL (String):
   *             The URL of the page that crashed.
   */
  get pageData() {
    delete this.pageData;

    let URL = document.documentURI;
    let queryString = URL.replace(/^about:tabcrashed?e=tabcrashed/, "");

    let titleMatch = queryString.match(/d=([^&]*)/);
    let URLMatch = queryString.match(/u=([^&]*)/);

    return (this.pageData = {
      title:
        titleMatch && titleMatch[1] ? decodeURIComponent(titleMatch[1]) : "",
      URL: URLMatch && URLMatch[1] ? decodeURIComponent(URLMatch[1]) : "",
    });
  },

  init() {
    addEventListener("DOMContentLoaded", this);

    document.title = this.pageData.title;
  },

  receiveMessage(message) {
    switch (message.name) {
      case "UpdateCount": {
        this.setMultiple(message.data.count > 1);
        break;
      }
      case "SetCrashReportAvailable": {
        this.onSetCrashReportAvailable(message);
        break;
      }
      case "CrashReportSent": {
        this.onCrashReportSent();
        break;
      }
    }
  },

  handleEvent(event) {
    switch (event.type) {
      case "DOMContentLoaded": {
        this.onDOMContentLoaded();
        break;
      }
      case "click": {
        this.onClick(event);
        break;
      }
    }
  },

  onDOMContentLoaded() {
    this.MESSAGES.forEach(msg =>
      RPMAddMessageListener(msg, this.receiveMessage.bind(this))
    );

    this.CLICK_TARGETS.forEach(targetID => {
      let el = document.getElementById(targetID);
      el.addEventListener("click", this);
    });

    // Error pages are loaded as LOAD_BACKGROUND, so they don't get load events.
    let event = new CustomEvent("AboutTabCrashedLoad", { bubbles: true });
    document.dispatchEvent(event);

    RPMSendAsyncMessage("Load");
  },

  onClick(event) {
    switch (event.target.id) {
      case "closeTab": {
        this.sendMessage("closeTab");
        break;
      }

      case "restoreTab": {
        this.sendMessage("restoreTab");
        break;
      }

      case "restoreAll": {
        this.sendMessage("restoreAll");
        break;
      }

      case "sendReport": {
        this.showCrashReportUI(event.target.checked);
        break;
      }
    }
  },

  /**
   * After this page tells the parent that it has loaded, the parent
   * will respond with whether or not a crash report is available. This
   * method handles that message.
   *
   * @param message
   *        The message from the parent, which should contain a data
   *        Object property with the following properties:
   *
   *        hasReport (bool):
   *          Whether or not there is a crash report.
   *
   *        sendReport (bool):
   *          Whether or not the the user prefers to send the report
   *          by default.
   *
   *        includeURL (bool):
   *          Whether or not the user prefers to send the URL of
   *          the tab that crashed.
   *
   *        requestAutoSubmit (bool):
   *          Whether or not we should ask the user to automatically
   *          submit backlogged crash reports.
   */
  onSetCrashReportAvailable(message) {
    let data = message.data;

    if (data.hasReport) {
      this.hasReport = true;
      document.documentElement.classList.add("crashDumpAvailable");

      document.getElementById("sendReport").checked = data.sendReport;
      document.getElementById("includeURL").checked = data.includeURL;

      this.showCrashReportUI(data.sendReport);
    } else {
      this.showCrashReportUI(false);
    }

    if (data.requestAutoSubmit) {
      document.getElementById("requestAutoSubmit").hidden = false;
    }

    let event = new CustomEvent("AboutTabCrashedReady", { bubbles: true });
    document.dispatchEvent(event);
  },

  /**
   * Handler for when the parent reports that the crash report associated
   * with this about:tabcrashed page has been sent.
   */
  onCrashReportSent() {
    document.documentElement.classList.remove("crashDumpAvailable");
    document.documentElement.classList.add("crashDumpSubmitted");
  },

  /**
   * Toggles the display of the crash report form.
   *
   * @param shouldShow (bool)
   *        True if the crash report form should be shown
   */
  showCrashReportUI(shouldShow) {
    let options = document.getElementById("options");
    options.hidden = !shouldShow;
  },

  /**
   * Toggles whether or not the page is one of several visible pages
   * showing the crash reporter. This controls some of the language
   * on the page, along with what the "primary" button is.
   *
   * @param hasMultiple (bool)
   *        True if there are multiple crash report pages being shown.
   */
  setMultiple(hasMultiple) {
    let main = document.getElementById("main");
    main.setAttribute("multiple", hasMultiple);

    let restoreTab = document.getElementById("restoreTab");

    // The "Restore All" button has the "primary" class by default, so
    // we only need to modify the "Restore Tab" button.
    if (hasMultiple) {
      restoreTab.classList.remove("primary");
    } else {
      restoreTab.classList.add("primary");
    }
  },

  /**
   * Sends a message to the parent in response to the user choosing
   * one of the actions available on the page. This might also send up
   * crash report information if the user has chosen to submit a crash
   * report.
   *
   * @param messageName (String)
   *        The message to send to the parent
   */
  sendMessage(messageName) {
    let comments = "";
    let URL = "";
    let sendReport = false;
    let includeURL = false;
    let autoSubmit = false;

    if (this.hasReport) {
      sendReport = document.getElementById("sendReport").checked;
      if (sendReport) {
        comments = document.getElementById("comments").value.trim();

        includeURL = document.getElementById("includeURL").checked;
        if (includeURL) {
          URL = this.pageData.URL.trim();
        }
      }
    }

    let requestAutoSubmit = document.getElementById("requestAutoSubmit");
    if (requestAutoSubmit.hidden) {
      // The checkbox is hidden if the user has already opted in to sending
      // backlogged crash reports.
      autoSubmit = true;
    } else {
      autoSubmit = document.getElementById("autoSubmit").checked;
    }

    RPMSendAsyncMessage(messageName, {
      sendReport,
      comments,
      includeURL,
      URL,
      autoSubmit,
      hasReport: this.hasReport,
    });
  },
};

AboutTabCrashed.init();
