/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* vim: set sts=2 sw=2 et tw=80: */
/* 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/. */

"use strict";

var { XPCOMUtils } = ChromeUtils.import(
  "resource://gre/modules/XPCOMUtils.jsm"
);

XPCOMUtils.defineLazyModuleGetters(this, {
  PlacesUtils: "resource://gre/modules/PlacesUtils.jsm",
  Services: "resource://gre/modules/Services.jsm",
});

var { normalizeTime } = ExtensionCommon;

let nsINavHistoryService = Ci.nsINavHistoryService;
const TRANSITION_TO_TRANSITION_TYPES_MAP = new Map([
  ["link", nsINavHistoryService.TRANSITION_LINK],
  ["typed", nsINavHistoryService.TRANSITION_TYPED],
  ["auto_bookmark", nsINavHistoryService.TRANSITION_BOOKMARK],
  ["auto_subframe", nsINavHistoryService.TRANSITION_EMBED],
  ["manual_subframe", nsINavHistoryService.TRANSITION_FRAMED_LINK],
  ["reload", nsINavHistoryService.TRANSITION_RELOAD],
]);

let TRANSITION_TYPE_TO_TRANSITIONS_MAP = new Map();
for (let [transition, transitionType] of TRANSITION_TO_TRANSITION_TYPES_MAP) {
  TRANSITION_TYPE_TO_TRANSITIONS_MAP.set(transitionType, transition);
}

const getTransitionType = transition => {
  // cannot set a default value for the transition argument as the framework sets it to null
  transition = transition || "link";
  let transitionType = TRANSITION_TO_TRANSITION_TYPES_MAP.get(transition);
  if (!transitionType) {
    throw new Error(
      `|${transition}| is not a supported transition for history`
    );
  }
  return transitionType;
};

const getTransition = transitionType => {
  return TRANSITION_TYPE_TO_TRANSITIONS_MAP.get(transitionType) || "link";
};

/*
 * Converts a nsINavHistoryResultNode into a HistoryItem
 *
 * https://developer.mozilla.org/en-US/docs/XPCOM_Interface_Reference/nsINavHistoryResultNode
 */
const convertNodeToHistoryItem = node => {
  return {
    id: node.pageGuid,
    url: node.uri,
    title: node.title,
    lastVisitTime: PlacesUtils.toDate(node.time).getTime(),
    visitCount: node.accessCount,
  };
};

/*
 * Converts a nsINavHistoryResultNode into a VisitItem
 *
 * https://developer.mozilla.org/en-US/docs/XPCOM_Interface_Reference/nsINavHistoryResultNode
 */
const convertNodeToVisitItem = node => {
  return {
    id: node.pageGuid,
    visitId: String(node.visitId),
    visitTime: PlacesUtils.toDate(node.time).getTime(),
    referringVisitId: String(node.fromVisitId),
    transition: getTransition(node.visitType),
  };
};

/*
 * Converts a nsINavHistoryContainerResultNode into an array of objects
 *
 * https://developer.mozilla.org/en-US/docs/XPCOM_Interface_Reference/nsINavHistoryContainerResultNode
 */
const convertNavHistoryContainerResultNode = (container, converter) => {
  let results = [];
  container.containerOpen = true;
  for (let i = 0; i < container.childCount; i++) {
    let node = container.getChild(i);
    results.push(converter(node));
  }
  container.containerOpen = false;
  return results;
};

var _observer;

const getHistoryObserver = () => {
  if (!_observer) {
    _observer = new (class extends EventEmitter {
      onDeleteURI(uri, guid, reason) {
        this.emit("visitRemoved", { allHistory: false, urls: [uri.spec] });
      }
      onBeginUpdateBatch() {}
      onEndUpdateBatch() {}
      onDeleteVisits(uri, partialRemoval, guid, reason) {
        if (!partialRemoval) {
          this.emit("visitRemoved", { allHistory: false, urls: [uri.spec] });
        }
      }
    })();
    PlacesUtils.history.addObserver(_observer);
  }
  return _observer;
};

this.history = class extends ExtensionAPI {
  getAPI(context) {
    return {
      history: {
        addUrl: function(details) {
          let transition, date;
          try {
            transition = getTransitionType(details.transition);
          } catch (error) {
            return Promise.reject({ message: error.message });
          }
          if (details.visitTime) {
            date = normalizeTime(details.visitTime);
          }
          let pageInfo = {
            title: details.title,
            url: details.url,
            visits: [
              {
                transition,
                date,
              },
            ],
          };
          try {
            return PlacesUtils.history.insert(pageInfo).then(() => undefined);
          } catch (error) {
            return Promise.reject({ message: error.message });
          }
        },

        deleteAll: function() {
          return PlacesUtils.history.clear();
        },

        deleteRange: function(filter) {
          let newFilter = {
            beginDate: normalizeTime(filter.startTime),
            endDate: normalizeTime(filter.endTime),
          };
          // History.removeVisitsByFilter returns a boolean, but our API should return nothing
          return PlacesUtils.history
            .removeVisitsByFilter(newFilter)
            .then(() => undefined);
        },

        deleteUrl: function(details) {
          let url = details.url;
          // History.remove returns a boolean, but our API should return nothing
          return PlacesUtils.history.remove(url).then(() => undefined);
        },

        search: function(query) {
          let beginTime =
            query.startTime == null
              ? PlacesUtils.toPRTime(Date.now() - 24 * 60 * 60 * 1000)
              : PlacesUtils.toPRTime(normalizeTime(query.startTime));
          let endTime =
            query.endTime == null
              ? Number.MAX_VALUE
              : PlacesUtils.toPRTime(normalizeTime(query.endTime));
          if (beginTime > endTime) {
            return Promise.reject({
              message: "The startTime cannot be after the endTime",
            });
          }

          let options = PlacesUtils.history.getNewQueryOptions();
          options.includeHidden = true;
          options.sortingMode = options.SORT_BY_DATE_DESCENDING;
          options.maxResults = query.maxResults || 100;

          let historyQuery = PlacesUtils.history.getNewQuery();
          historyQuery.searchTerms = query.text;
          historyQuery.beginTime = beginTime;
          historyQuery.endTime = endTime;
          let queryResult = PlacesUtils.history.executeQuery(
            historyQuery,
            options
          ).root;
          let results = convertNavHistoryContainerResultNode(
            queryResult,
            convertNodeToHistoryItem
          );
          return Promise.resolve(results);
        },

        getVisits: function(details) {
          let url = details.url;
          if (!url) {
            return Promise.reject({
              message: "A URL must be provided for getVisits",
            });
          }

          let options = PlacesUtils.history.getNewQueryOptions();
          options.includeHidden = true;
          options.sortingMode = options.SORT_BY_DATE_DESCENDING;
          options.resultType = options.RESULTS_AS_VISIT;

          let historyQuery = PlacesUtils.history.getNewQuery();
          historyQuery.uri = Services.io.newURI(url);
          let queryResult = PlacesUtils.history.executeQuery(
            historyQuery,
            options
          ).root;
          let results = convertNavHistoryContainerResultNode(
            queryResult,
            convertNodeToVisitItem
          );
          return Promise.resolve(results);
        },

        onVisited: new EventManager({
          context,
          name: "history.onVisited",
          register: fire => {
            const listener = events => {
              for (const event of events) {
                const visit = {
                  id: event.pageGuid,
                  url: event.url,
                  title: event.lastKnownTitle || "",
                  lastVisitTime: event.visitTime,
                  visitCount: event.visitCount,
                  typedCount: event.typedCount,
                };
                fire.sync(visit);
              }
            };

            PlacesUtils.observers.addListener(["page-visited"], listener);
            return () => {
              PlacesUtils.observers.removeListener(["page-visited"], listener);
            };
          },
        }).api(),

        onVisitRemoved: new EventManager({
          context,
          name: "history.onVisitRemoved",
          register: fire => {
            let listener = (event, data) => {
              fire.sync(data);
            };
            const historyClearedListener = events => {
              fire.sync({ allHistory: true, urls: [] });
            };

            getHistoryObserver().on("visitRemoved", listener);
            PlacesUtils.observers.addListener(
              ["history-cleared"],
              historyClearedListener
            );
            return () => {
              getHistoryObserver().off("visitRemoved", listener);
              PlacesUtils.observers.removeListener(
                ["history-cleared"],
                historyClearedListener
              );
            };
          },
        }).api(),

        onTitleChanged: new EventManager({
          context,
          name: "history.onTitleChanged",
          register: fire => {
            const listener = events => {
              for (const event of events) {
                const titleChanged = {
                  id: event.pageGuid,
                  url: event.url,
                  title: event.title,
                };
                fire.sync(titleChanged);
              }
            };

            PlacesUtils.observers.addListener(["page-title-changed"], listener);
            return () => {
              PlacesUtils.observers.removeListener(
                ["page-title-changed"],
                listener
              );
            };
          },
        }).api(),
      },
    };
  }
};