"use strict";

// The ext-* files are imported into the same scopes.
/* import-globals-from ext-toolkit.js */

// This file expectes tabTracker to be defined in the global scope (e.g.
// by ext-utils.js).
/* global tabTracker */

ChromeUtils.defineModuleGetter(this, "MatchURLFilters",
                               "resource://gre/modules/MatchURLFilters.jsm");
ChromeUtils.defineModuleGetter(this, "WebNavigation",
                               "resource://gre/modules/WebNavigation.jsm");

const defaultTransitionTypes = {
  topFrame: "link",
  subFrame: "auto_subframe",
};

const frameTransitions = {
  anyFrame: {
    qualifiers: ["server_redirect", "client_redirect", "forward_back"],
  },
  topFrame: {
    types: ["reload", "form_submit"],
  },
};

const tabTransitions = {
  topFrame: {
    qualifiers: ["from_address_bar"],
    types: ["auto_bookmark", "typed", "keyword", "generated", "link"],
  },
  subFrame: {
    types: ["manual_subframe"],
  },
};

const isTopLevelFrame = ({frameId, parentFrameId}) => {
  return frameId == 0 && parentFrameId == -1;
};

const fillTransitionProperties = (eventName, src, dst) => {
  if (eventName == "onCommitted" ||
      eventName == "onHistoryStateUpdated" ||
      eventName == "onReferenceFragmentUpdated") {
    let frameTransitionData = src.frameTransitionData || {};
    let tabTransitionData = src.tabTransitionData || {};

    let transitionType, transitionQualifiers = [];

    // Fill transition properties for any frame.
    for (let qualifier of frameTransitions.anyFrame.qualifiers) {
      if (frameTransitionData[qualifier]) {
        transitionQualifiers.push(qualifier);
      }
    }

    if (isTopLevelFrame(dst)) {
      for (let type of frameTransitions.topFrame.types) {
        if (frameTransitionData[type]) {
          transitionType = type;
        }
      }

      for (let qualifier of tabTransitions.topFrame.qualifiers) {
        if (tabTransitionData[qualifier]) {
          transitionQualifiers.push(qualifier);
        }
      }

      for (let type of tabTransitions.topFrame.types) {
        if (tabTransitionData[type]) {
          transitionType = type;
        }
      }

      // If transitionType is not defined, defaults it to "link".
      if (!transitionType) {
        transitionType = defaultTransitionTypes.topFrame;
      }
    } else {
      // If it is sub-frame, transitionType defaults it to "auto_subframe",
      // "manual_subframe" is set only in case of a recent user interaction.
      transitionType = tabTransitionData.link ?
        "manual_subframe" : defaultTransitionTypes.subFrame;
    }

    // Fill the transition properties in the webNavigation event object.
    dst.transitionType = transitionType;
    dst.transitionQualifiers = transitionQualifiers;
  }
};

// Similar to WebRequestEventManager but for WebNavigation.
function WebNavigationEventManager(context, eventName) {
  let name = `webNavigation.${eventName}`;
  let register = (fire, urlFilters) => {
    // Don't create a MatchURLFilters instance if the listener does not include any filter.
    let filters = urlFilters ? new MatchURLFilters(urlFilters.url) : null;

    let listener = data => {
      if (!data.browser) {
        return;
      }

      let data2 = {
        url: data.url,
        timeStamp: Date.now(),
      };

      if (eventName == "onErrorOccurred") {
        data2.error = data.error;
      }

      if (data.frameId != undefined) {
        data2.frameId = data.frameId;
        data2.parentFrameId = data.parentFrameId;
      }

      if (data.sourceFrameId != undefined) {
        data2.sourceFrameId = data.sourceFrameId;
      }

      // Fills in tabId typically.
      Object.assign(data2, tabTracker.getBrowserData(data.browser));
      if (data2.tabId < 0) {
        return;
      }

      if (data.sourceTabBrowser) {
        data2.sourceTabId = tabTracker.getBrowserData(data.sourceTabBrowser).tabId;
      }

      fillTransitionProperties(eventName, data, data2);

      fire.async(data2);
    };

    WebNavigation[eventName].addListener(listener, filters);
    return () => {
      WebNavigation[eventName].removeListener(listener);
    };
  };

  return EventManager.call(this, context, name, register);
}

WebNavigationEventManager.prototype = Object.create(EventManager.prototype);

const convertGetFrameResult = (tabId, data) => {
  return {
    errorOccurred: data.errorOccurred,
    url: data.url,
    tabId,
    frameId: data.frameId,
    parentFrameId: data.parentFrameId,
  };
};

this.webNavigation = class extends ExtensionAPI {
  getAPI(context) {
    let {tabManager} = context.extension;

    return {
      webNavigation: {
        onTabReplaced: new EventManager(context, "webNavigation.onTabReplaced", fire => {
          return () => {};
        }).api(),
        onBeforeNavigate: new WebNavigationEventManager(context, "onBeforeNavigate").api(),
        onCommitted: new WebNavigationEventManager(context, "onCommitted").api(),
        onDOMContentLoaded: new WebNavigationEventManager(context, "onDOMContentLoaded").api(),
        onCompleted: new WebNavigationEventManager(context, "onCompleted").api(),
        onErrorOccurred: new WebNavigationEventManager(context, "onErrorOccurred").api(),
        onReferenceFragmentUpdated: new WebNavigationEventManager(context, "onReferenceFragmentUpdated").api(),
        onHistoryStateUpdated: new WebNavigationEventManager(context, "onHistoryStateUpdated").api(),
        onCreatedNavigationTarget: new WebNavigationEventManager(context, "onCreatedNavigationTarget").api(),
        getAllFrames(details) {
          let tab = tabManager.get(details.tabId);

          let {innerWindowID, messageManager} = tab.browser;
          let recipient = {innerWindowID};

          return context.sendMessage(messageManager, "WebNavigation:GetAllFrames", {}, {recipient})
                        .then((results) => results.map(convertGetFrameResult.bind(null, details.tabId)));
        },
        getFrame(details) {
          let tab = tabManager.get(details.tabId);

          let recipient = {
            innerWindowID: tab.browser.innerWindowID,
          };

          let mm = tab.browser.messageManager;
          return context.sendMessage(mm, "WebNavigation:GetFrame", {options: details}, {recipient})
                        .then((result) => {
                          return result ?
                            convertGetFrameResult(details.tabId, result) :
                            Promise.reject({message: `No frame found with frameId: ${details.frameId}`});
                        });
        },
      },
    };
  }
};