# Copyright 2016 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file or at
# https://developers.google.com/open-source/licenses/bsd

"""Unittests for monorail.tracker.rerank_helpers."""
from __future__ import print_function
from __future__ import division
from __future__ import absolute_import

import unittest

from framework import exceptions
from testing import fake
from tracker import rerank_helpers


rerank_helpers.MAX_RANKING = 10


class Rerank_HelpersTest(unittest.TestCase):

  def setUp(self):
    self.PAST_TIME = 12345
    hotlist_item_fields = [
        (78904, 31, 111, self.PAST_TIME, 'note'),
        (78903, 21, 222, self.PAST_TIME, 'note'),
        (78902, 11, 111, self.PAST_TIME, 'note'),
        (78901, 1, 222, self.PAST_TIME, 'note')]
    self.hotlist = fake.Hotlist(
        'hotlist_name', 1234, hotlist_item_fields=hotlist_item_fields)

  # Tested in tests for RerankHotlistItems.
  def testGetHotlistRerankChanges_FirstPosition(self):
    moved_issue_ids = [78903, 78902]
    target_position = 0
    changed_ranks = rerank_helpers.GetHotlistRerankChanges(
        self.hotlist.items, moved_issue_ids, target_position)
    self.assertEqual(changed_ranks, [(78903, 5), (78902, 15), (78901, 25)])

  def testGetHotlistRerankChanges_LastPosition(self):
    moved_issue_ids = [78903, 78902]
    target_position = 2
    changed_ranks = rerank_helpers.GetHotlistRerankChanges(
        self.hotlist.items, moved_issue_ids, target_position)
    self.assertEqual(changed_ranks, [(78904, 3), (78903, 6), (78902, 9)])

  def testGetHotlistRerankChanges_Middle(self):
    moved_issue_ids = [78903]
    target_position = 1
    changed_ranks = rerank_helpers.GetHotlistRerankChanges(
        self.hotlist.items, moved_issue_ids, target_position)
    self.assertEqual(changed_ranks, [(78903, 6)])


  def testGetHotlistRerankChanges_NewMoveIds(self):
    "We can handle reranking for inserting new issues."
    moved_issue_ids = [78909, 78910, 78903]
    target_position = 0
    changed_ranks = rerank_helpers.GetHotlistRerankChanges(
        self.hotlist.items, moved_issue_ids, target_position)
    self.assertEqual(
        changed_ranks, [(78909, 1), (78910, 3), (78903, 5), (78901, 7)])

  def testGetHotlistRerankChanges_InvalidMovedIds(self):
    moved_issue_ids = [78903]
    target_position = -1
    with self.assertRaises(exceptions.InputException):
      rerank_helpers.GetHotlistRerankChanges(
          self.hotlist.items, moved_issue_ids, target_position)

  def testGetHotlistRerankChanges_InvalidPosition(self):
    moved_issue_ids = [78909]
    target_position = 8
    with self.assertRaises(exceptions.InputException):
      rerank_helpers.GetHotlistRerankChanges(
          self.hotlist.items, moved_issue_ids, target_position)

  def testGetInsertRankings(self):
    lower = [(1, 0)]
    higher = [(2, 10)]
    moved_ids = [3]
    ret = rerank_helpers.GetInsertRankings(lower, higher, moved_ids)
    self.assertEqual(ret, [(3, 5)])

  def testGetInsertRankings_Below(self):
    lower = []
    higher = [(1, 2)]
    moved_ids = [2]
    ret = rerank_helpers.GetInsertRankings(lower, higher, moved_ids)
    self.assertEqual(ret, [(2, 1)])

  def testGetInsertRankings_Above(self):
    lower = [(1, 0)]
    higher = []
    moved_ids = [2]
    ret = rerank_helpers.GetInsertRankings(lower, higher, moved_ids)
    self.assertEqual(ret, [(2, 5)])

  def testGetInsertRankings_Multiple(self):
    lower = [(1, 0)]
    higher = [(2, 10)]
    moved_ids = [3,4,5]
    ret = rerank_helpers.GetInsertRankings(lower, higher, moved_ids)
    self.assertEqual(ret, [(3, 2), (4, 5), (5, 8)])

  def testGetInsertRankings_SplitLow(self):
    lower = [(1, 0), (2, 5)]
    higher = [(3, 6), (4, 10)]
    moved_ids = [5]
    ret = rerank_helpers.GetInsertRankings(lower, higher, moved_ids)
    self.assertEqual(ret, [(2, 2), (5, 5)])

  def testGetInsertRankings_SplitHigh(self):
    lower = [(1, 0), (2, 4)]
    higher = [(3, 5), (4, 10)]
    moved_ids = [5]
    ret = rerank_helpers.GetInsertRankings(lower, higher, moved_ids)
    self.assertEqual(ret, [(5, 6), (3, 9)])

  def testGetInsertRankings_NoLower(self):
    lower = []
    higher = [(1, 1)]
    moved_ids = [2]
    ret = rerank_helpers.GetInsertRankings(lower, higher, moved_ids)
    self.assertEqual(ret, [(2, 3), (1, 8)])

  def testGetInsertRankings_NoRoom(self):
    max_ranking, rerank_helpers.MAX_RANKING = rerank_helpers.MAX_RANKING, 1
    lower = [(1, 0)]
    higher = [(2, 1)]
    moved_ids = [3]
    ret = rerank_helpers.GetInsertRankings(lower, higher, moved_ids)
    self.assertIsNone(ret)
    rerank_helpers.MAX_RANKING = max_ranking