/* Any copyright is dedicated to the Public Domain.
   http://creativecommons.org/publicdomain/zero/1.0/ */

Cu.import("resource://gre/modules/osfile.jsm");
Cu.import("resource://services-common/observers.js");
Cu.import("resource://services-sync/engines.js");
Cu.import("resource://services-sync/service.js");
Cu.import("resource://services-sync/util.js");

function SteamStore(engine) {
  Store.call(this, "Steam", engine);
  this.wasWiped = false;
}
SteamStore.prototype = {
  __proto__: Store.prototype,

  wipe() {
    this.wasWiped = true;
  }
};

function SteamTracker(name, engine) {
  Tracker.call(this, name || "Steam", engine);
}
SteamTracker.prototype = {
  __proto__: Tracker.prototype,
  persistChangedIDs: false,
};

function SteamEngine(name, service) {
  Engine.call(this, name, service);
  this.wasReset = false;
  this.wasSynced = false;
}
SteamEngine.prototype = {
  __proto__: Engine.prototype,
  _storeObj: SteamStore,
  _trackerObj: SteamTracker,

  _resetClient() {
    this.wasReset = true;
  },

  _sync() {
    this.wasSynced = true;
  }
};

var engineObserver = {
  topics: [],

  observe(subject, topic, data) {
    do_check_eq(data, "steam");
    this.topics.push(topic);
  },

  reset() {
    this.topics = [];
  }
};
Observers.add("weave:engine:reset-client:start", engineObserver);
Observers.add("weave:engine:reset-client:finish", engineObserver);
Observers.add("weave:engine:wipe-client:start", engineObserver);
Observers.add("weave:engine:wipe-client:finish", engineObserver);
Observers.add("weave:engine:sync:start", engineObserver);
Observers.add("weave:engine:sync:finish", engineObserver);

async function cleanup(engine) {
  Svc.Prefs.resetBranch("");
  engine.wasReset = false;
  engine.wasSynced = false;
  engineObserver.reset();
  engine._tracker.clearChangedIDs();
  await engine._tracker._storage.finalize();
}

add_task(async function test_members() {
  _("Engine object members");
  let engine = new SteamEngine("Steam", Service);
  do_check_eq(engine.Name, "Steam");
  do_check_eq(engine.prefName, "steam");
  do_check_true(engine._store instanceof SteamStore);
  do_check_true(engine._tracker instanceof SteamTracker);
});

add_task(async function test_score() {
  _("Engine.score corresponds to tracker.score and is readonly");
  let engine = new SteamEngine("Steam", Service);
  do_check_eq(engine.score, 0);
  engine._tracker.score += 5;
  do_check_eq(engine.score, 5);

  try {
    engine.score = 10;
  } catch (ex) {
    // Setting an attribute that has a getter produces an error in
    // Firefox <= 3.6 and is ignored in later versions.  Either way,
    // the attribute's value won't change.
  }
  do_check_eq(engine.score, 5);
});

add_task(async function test_resetClient() {
  _("Engine.resetClient calls _resetClient");
  let engine = new SteamEngine("Steam", Service);
  do_check_false(engine.wasReset);

  engine.resetClient();
  do_check_true(engine.wasReset);
  do_check_eq(engineObserver.topics[0], "weave:engine:reset-client:start");
  do_check_eq(engineObserver.topics[1], "weave:engine:reset-client:finish");

  await cleanup(engine);
});

add_task(async function test_invalidChangedIDs() {
  _("Test that invalid changed IDs on disk don't end up live.");
  let engine = new SteamEngine("Steam", Service);
  let tracker = engine._tracker;

  await tracker._beforeSave();
  await OS.File.writeAtomic(tracker._storage.path, new TextEncoder().encode("5"),
                            { tmpPath: tracker._storage.path + ".tmp" });

  ok(!tracker._storage.dataReady);
  tracker.changedIDs.placeholder = true;
  deepEqual(tracker.changedIDs, { placeholder: true },
    "Accessing changed IDs should load changes from disk as a side effect");
  ok(tracker._storage.dataReady);

  do_check_true(tracker.changedIDs.placeholder);
  await cleanup(engine);
});

add_task(async function test_wipeClient() {
  _("Engine.wipeClient calls resetClient, wipes store, clears changed IDs");
  let engine = new SteamEngine("Steam", Service);
  do_check_false(engine.wasReset);
  do_check_false(engine._store.wasWiped);
  do_check_true(engine._tracker.addChangedID("a-changed-id"));
  do_check_true("a-changed-id" in engine._tracker.changedIDs);

  engine.wipeClient();
  do_check_true(engine.wasReset);
  do_check_true(engine._store.wasWiped);
  do_check_eq(JSON.stringify(engine._tracker.changedIDs), "{}");
  do_check_eq(engineObserver.topics[0], "weave:engine:wipe-client:start");
  do_check_eq(engineObserver.topics[1], "weave:engine:reset-client:start");
  do_check_eq(engineObserver.topics[2], "weave:engine:reset-client:finish");
  do_check_eq(engineObserver.topics[3], "weave:engine:wipe-client:finish");

  await cleanup(engine);
});

add_task(async function test_enabled() {
  _("Engine.enabled corresponds to preference");
  let engine = new SteamEngine("Steam", Service);
  try {
    do_check_false(engine.enabled);
    Svc.Prefs.set("engine.steam", true);
    do_check_true(engine.enabled);

    engine.enabled = false;
    do_check_false(Svc.Prefs.get("engine.steam"));
  } finally {
    await cleanup(engine);
  }
});

add_task(async function test_sync() {
  let engine = new SteamEngine("Steam", Service);
  try {
    _("Engine.sync doesn't call _sync if it's not enabled");
    do_check_false(engine.enabled);
    do_check_false(engine.wasSynced);
    engine.sync();

    do_check_false(engine.wasSynced);

    _("Engine.sync calls _sync if it's enabled");
    engine.enabled = true;

    engine.sync();
    do_check_true(engine.wasSynced);
    do_check_eq(engineObserver.topics[0], "weave:engine:sync:start");
    do_check_eq(engineObserver.topics[1], "weave:engine:sync:finish");
  } finally {
    await cleanup(engine);
  }
});

add_task(async function test_disabled_no_track() {
  _("When an engine is disabled, its tracker is not tracking.");
  let engine = new SteamEngine("Steam", Service);
  let tracker = engine._tracker;
  do_check_eq(engine, tracker.engine);

  do_check_false(engine.enabled);
  do_check_false(tracker._isTracking);
  do_check_empty(tracker.changedIDs);

  do_check_false(tracker.engineIsEnabled());
  tracker.observe(null, "weave:engine:start-tracking", null);
  do_check_false(tracker._isTracking);
  do_check_empty(tracker.changedIDs);

  engine.enabled = true;
  tracker.observe(null, "weave:engine:start-tracking", null);
  do_check_true(tracker._isTracking);
  do_check_empty(tracker.changedIDs);

  tracker.addChangedID("abcdefghijkl");
  do_check_true(0 < tracker.changedIDs["abcdefghijkl"]);
  Svc.Prefs.set("engine." + engine.prefName, false);
  do_check_false(tracker._isTracking);
  do_check_empty(tracker.changedIDs);

  await cleanup(engine);
});
