/**
 * Tracks a set of bookmark guids and their syncChangeCounter field and
 * provides a simple way for the test to check the correct fields had the
 * counter incremented.
 */
class CounterTracker {
  constructor() {
    this.tracked = new Map();
  }

  async _getCounter(guid) {
    let fields = await PlacesTestUtils.fetchBookmarkSyncFields(guid);
    if (!fields.length) {
      throw new Error(`Item ${guid} does not exist`);
    }
    return fields[0].syncChangeCounter;
  }

  // Call this after creating a new bookmark.
  async track(guid, name, expectedInitial = 1) {
    if (this.tracked.has(guid)) {
      throw new Error(`Already tracking item ${guid}`);
    }
    let initial = await this._getCounter(guid);
    Assert.equal(
      initial,
      expectedInitial,
      `Initial value of item '${name}' is correct`
    );
    this.tracked.set(guid, { name, value: expectedInitial });
  }

  // Call this to check *only* the specified IDs had a change increment, and
  // that none of the other "tracked" ones did.
  async check(...expectedToIncrement) {
    info(`Checking counter for items ${JSON.stringify(expectedToIncrement)}`);
    for (let [guid, entry] of this.tracked) {
      let { name, value } = entry;
      let newValue = await this._getCounter(guid);
      let desc = `record '${name}' (guid=${guid})`;
      if (expectedToIncrement.includes(guid)) {
        // Note we don't check specifically for +1, as some changes will
        // increment the counter by more than 1 (which is OK).
        Assert.greater(
          newValue,
          value,
          `${desc} was expected to increment - was ${value}, now ${newValue}`
        );
        this.tracked.set(guid, { name, value: newValue });
      } else {
        Assert.equal(newValue, value, `${desc} was NOT expected to increment`);
      }
    }
  }
}

async function checkSyncFields(guid, expected) {
  let results = await PlacesTestUtils.fetchBookmarkSyncFields(guid);
  if (!results.length) {
    throw new Error(`Missing sync fields for ${guid}`);
  }
  for (let name in expected) {
    let expectedValue = expected[name];
    Assert.equal(
      results[0][name],
      expectedValue,
      `field ${name} matches item ${guid}`
    );
  }
}

/**
 * Common test cases for sync field changes.
 */
class TestCases {
  async run() {
    info("Test 1: inserts, updates, tags, and keywords");
    try {
      await this.testChanges();
    } finally {
      info("Reset sync fields after test 1");
      await PlacesTestUtils.markBookmarksAsSynced();
    }

    if ("moveItem" in this && "reorder" in this) {
      info("Test 2: reparenting");
      try {
        await this.testReparenting();
      } finally {
        info("Reset sync fields after test 2");
        await PlacesTestUtils.markBookmarksAsSynced();
      }
    }

    if ("insertSeparator" in this) {
      info("Test 3: separators");
      try {
        await this.testSeparators();
      } finally {
        info("Reset sync fields after test 3");
        await PlacesTestUtils.markBookmarksAsSynced();
      }
    }
  }

  async testChanges() {
    let testUri = NetUtil.newURI("http://test.mozilla.org");

    let guid = await this.insertBookmark(
      PlacesUtils.bookmarks.unfiledGuid,
      testUri,
      PlacesUtils.bookmarks.DEFAULT_INDEX,
      "bookmark title"
    );
    info(`Inserted bookmark ${guid}`);
    await checkSyncFields(guid, {
      syncStatus: PlacesUtils.bookmarks.SYNC_STATUS.NEW,
      syncChangeCounter: 1,
    });

    // Pretend Sync just did whatever it does
    await PlacesTestUtils.setBookmarkSyncFields({
      guid,
      syncStatus: PlacesUtils.bookmarks.SYNC_STATUS.NORMAL,
    });
    info(`Updated sync status of ${guid}`);
    await checkSyncFields(guid, {
      syncStatus: PlacesUtils.bookmarks.SYNC_STATUS.NORMAL,
      syncChangeCounter: 1,
    });

    // update it - it should increment the change counter
    await this.setTitle(guid, "new title");
    info(`Changed title of ${guid}`);
    await checkSyncFields(guid, {
      syncStatus: PlacesUtils.bookmarks.SYNC_STATUS.NORMAL,
      syncChangeCounter: 2,
    });

    // Tagging a bookmark should update its change counter.
    await this.tagURI(testUri, ["test-tag"]);
    info(`Tagged bookmark ${guid}`);
    await checkSyncFields(guid, { syncChangeCounter: 3 });

    if ("setKeyword" in this) {
      await this.setKeyword(guid, "keyword");
      info(`Set keyword for bookmark ${guid}`);
      await checkSyncFields(guid, { syncChangeCounter: 4 });
    }
    if ("removeKeyword" in this) {
      await this.removeKeyword(guid, "keyword");
      info(`Removed keyword from bookmark ${guid}`);
      await checkSyncFields(guid, { syncChangeCounter: 5 });
    }
  }

  async testSeparators() {
    let insertSyncedBookmark = uri => {
      return this.insertBookmark(
        PlacesUtils.bookmarks.unfiledGuid,
        NetUtil.newURI(uri),
        PlacesUtils.bookmarks.DEFAULT_INDEX,
        "A bookmark name"
      );
    };

    await insertSyncedBookmark("http://foo.bar");
    let secondBmk = await insertSyncedBookmark("http://bar.foo");
    let sepGuid = await this.insertSeparator(
      PlacesUtils.bookmarks.unfiledGuid,
      PlacesUtils.bookmarks.DEFAULT_INDEX
    );
    await insertSyncedBookmark("http://barbar.foo");

    info("Move a bookmark around the separator");
    await this.moveItem(secondBmk, PlacesUtils.bookmarks.unfiledGuid, 4);
    await checkSyncFields(sepGuid, { syncChangeCounter: 2 });

    info("Move a separator around directly");
    await this.moveItem(sepGuid, PlacesUtils.bookmarks.unfiledGuid, 0);
    await checkSyncFields(sepGuid, { syncChangeCounter: 3 });
  }

  async testReparenting() {
    let counterTracker = new CounterTracker();

    let folder1 = await this.createFolder(
      PlacesUtils.bookmarks.unfiledGuid,
      "folder1",
      PlacesUtils.bookmarks.DEFAULT_INDEX
    );
    info(`Created the first folder, guid is ${folder1}`);

    // New folder should have a change recorded.
    await counterTracker.track(folder1, "folder 1");

    // Put a new bookmark in the folder.
    let testUri = NetUtil.newURI("http://test2.mozilla.org");
    let child1 = await this.insertBookmark(
      folder1,
      testUri,
      PlacesUtils.bookmarks.DEFAULT_INDEX,
      "bookmark 1"
    );
    info(`Created a new bookmark into ${folder1}, guid is ${child1}`);
    // both the folder and the child should have a change recorded.
    await counterTracker.track(child1, "child 1");
    await counterTracker.check(folder1);

    // A new child in the folder at index 0 - even though the existing child
    // was bumped down the list, it should *not* have a change recorded.
    let child2 = await this.insertBookmark(folder1, testUri, 0, "bookmark 2");
    info(
      `Created a second new bookmark into folder ${folder1}, guid is ${child2}`
    );

    await counterTracker.track(child2, "child 2");
    await counterTracker.check(folder1);

    // Move the items within the same folder - this should result in just a
    // change for the parent, but for neither of the children.
    // child0 is currently at index 0, so move child1 there.
    await this.moveItem(child1, folder1, 0);
    await counterTracker.check(folder1);

    // Another folder to play with.
    let folder2 = await this.createFolder(
      PlacesUtils.bookmarks.unfiledGuid,
      "folder2",
      PlacesUtils.bookmarks.DEFAULT_INDEX
    );
    info(`Created a second new folder, guid is ${folder2}`);
    await counterTracker.track(folder2, "folder 2");
    // nothing else has changed.
    await counterTracker.check();

    // Move one of the children to the new folder.
    info(
      `Moving bookmark ${child2} from folder ${folder1} to folder ${folder2}`
    );
    await this.moveItem(child2, folder2, PlacesUtils.bookmarks.DEFAULT_INDEX);
    // child1 should have no change, everything should have a new change.
    await counterTracker.check(folder1, folder2, child2);

    // Move the new folder to another root.
    await this.moveItem(
      folder2,
      PlacesUtils.bookmarks.toolbarGuid,
      PlacesUtils.bookmarks.DEFAULT_INDEX
    );
    info(`Moving folder ${folder2} to toolbar`);
    await counterTracker.check(
      folder2,
      PlacesUtils.bookmarks.toolbarGuid,
      PlacesUtils.bookmarks.unfiledGuid
    );

    let child3 = await this.insertBookmark(folder2, testUri, 0, "bookmark 3");
    info(`Prepended child ${child3} to folder ${folder2}`);
    await counterTracker.check(folder2, child3);

    // Reordering should only track the parent.
    await this.reorder(folder2, [child2, child3]);
    info(`Reorder children of ${folder2}`);
    await counterTracker.check(folder2);

    // All fields still have a syncStatus of SYNC_STATUS_NEW - so deleting them
    // should *not* cause any deleted items to be written.
    await this.removeItem(folder1);
    Assert.equal((await PlacesTestUtils.fetchSyncTombstones()).length, 0);

    // Set folder2 and child2 to have a state of SYNC_STATUS_NORMAL and deleting
    // them will cause both GUIDs to be written to moz_bookmarks_deleted.
    await PlacesTestUtils.setBookmarkSyncFields({
      guid: folder2,
      syncStatus: PlacesUtils.bookmarks.SYNC_STATUS.NORMAL,
    });
    await PlacesTestUtils.setBookmarkSyncFields({
      guid: child2,
      syncStatus: PlacesUtils.bookmarks.SYNC_STATUS.NORMAL,
    });
    await this.removeItem(folder2);
    let tombstones = await PlacesTestUtils.fetchSyncTombstones();
    let tombstoneGuids = sortBy(tombstones, "guid").map(({ guid }) => guid);
    Assert.equal(tombstoneGuids.length, 2);
    Assert.deepEqual(tombstoneGuids, [folder2, child2].sort(compareAscending));
  }
}

/**
 * Exercises the legacy, synchronous `nsINavBookmarksService` calls implemented
 *  in C++.
 */
class SyncTestCases extends TestCases {
  async createFolder(parentGuid, title, index) {
    let parentId = await PlacesTestUtils.promiseItemId(parentGuid);
    let id = PlacesUtils.bookmarks.createFolder(parentId, title, index);
    return PlacesTestUtils.promiseItemGuid(id);
  }

  async insertBookmark(parentGuid, uri, index, title) {
    let parentId = await PlacesTestUtils.promiseItemId(parentGuid);
    let id = PlacesUtils.bookmarks.insertBookmark(parentId, uri, index, title);
    return PlacesTestUtils.promiseItemGuid(id);
  }

  async removeItem(guid) {
    let id = await PlacesTestUtils.promiseItemId(guid);
    PlacesUtils.bookmarks.removeItem(id);
  }

  async setTitle(guid, title) {
    let id = await PlacesTestUtils.promiseItemId(guid);
    PlacesUtils.bookmarks.setItemTitle(id, title);
  }

  async tagURI(uri, tags) {
    PlacesUtils.tagging.tagURI(uri, tags);
  }
}

async function findTagFolder(tag) {
  let db = await PlacesUtils.promiseDBConnection();
  let results = await db.executeCached(
    `
  SELECT guid
  FROM moz_bookmarks
  WHERE type = :type AND
        parent = :tagsFolderId AND
        title = :tag`,
    {
      type: PlacesUtils.bookmarks.TYPE_FOLDER,
      tagsFolderId: PlacesUtils.tagsFolderId,
      tag,
    }
  );
  return results.length ? results[0].getResultByName("guid") : null;
}

/**
 * Exercises the new, async calls implemented in `Bookmarks.sys.mjs`.
 */
class AsyncTestCases extends TestCases {
  async createFolder(parentGuid, title, index) {
    let item = await PlacesUtils.bookmarks.insert({
      type: PlacesUtils.bookmarks.TYPE_FOLDER,
      parentGuid,
      title,
      index,
    });
    return item.guid;
  }

  async insertBookmark(parentGuid, uri, index, title) {
    let item = await PlacesUtils.bookmarks.insert({
      parentGuid,
      url: uri,
      index,
      title,
    });
    return item.guid;
  }

  async insertSeparator(parentGuid, index) {
    let item = await PlacesUtils.bookmarks.insert({
      type: PlacesUtils.bookmarks.TYPE_SEPARATOR,
      parentGuid,
      index,
    });
    return item.guid;
  }

  async moveItem(guid, newParentGuid, index) {
    await PlacesUtils.bookmarks.update({
      guid,
      parentGuid: newParentGuid,
      index,
    });
  }

  async removeItem(guid) {
    await PlacesUtils.bookmarks.remove(guid);
  }

  async setTitle(guid, title) {
    await PlacesUtils.bookmarks.update({ guid, title });
  }

  async setKeyword(guid, keyword) {
    let item = await PlacesUtils.bookmarks.fetch(guid);
    if (!item) {
      throw new Error(
        `Cannot set keyword ${keyword} on nonexistent bookmark ${guid}`
      );
    }
    await PlacesUtils.keywords.insert({ keyword, url: item.url });
  }

  async removeKeyword(guid, keyword) {
    let item = await PlacesUtils.bookmarks.fetch(guid);
    if (!item) {
      throw new Error(
        `Cannot remove keyword ${keyword} from nonexistent bookmark ${guid}`
      );
    }
    let entry = await PlacesUtils.keywords.fetch({ keyword, url: item.url });
    if (!entry) {
      throw new Error(`Keyword ${keyword} not set on bookmark ${guid}`);
    }
    await PlacesUtils.keywords.remove(entry);
  }

  // There's no async API for tags, but the `PlacesUtils.bookmarks` methods are
  // tag-aware, and should bump the change counters for tagged bookmarks when
  // called directly.
  async tagURI(uri, tags) {
    for (let tag of tags) {
      let tagFolderGuid = await findTagFolder(tag);
      if (!tagFolderGuid) {
        let tagFolder = await PlacesUtils.bookmarks.insert({
          type: PlacesUtils.bookmarks.TYPE_FOLDER,
          parentGuid: PlacesUtils.bookmarks.tagsGuid,
          title: tag,
        });
        tagFolderGuid = tagFolder.guid;
      }
      await PlacesUtils.bookmarks.insert({
        url: uri,
        parentGuid: tagFolderGuid,
      });
    }
  }

  async reorder(parentGuid, childGuids) {
    await PlacesUtils.bookmarks.reorder(parentGuid, childGuids);
  }
}

add_task(async function test_sync_api() {
  let tests = new SyncTestCases();
  await tests.run();
});

add_task(async function test_async_api() {
  let tests = new AsyncTestCases();
  await tests.run();
});