// Copyright 2014 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.

#include "components/omnibox/browser/answers_cache.h"

#include "base/strings/utf_string_conversions.h"
#include "testing/gtest/include/gtest/gtest.h"

TEST(AnswersCacheTest, CacheStartsEmpty) {
  AnswersCache cache(1);
  EXPECT_TRUE(cache.empty());
}

TEST(AnswersCacheTest, UpdatePopulatesCache) {
  AnswersCache cache(1);
  cache.UpdateRecentAnswers(base::ASCIIToUTF16("weather los angeles"),
                            base::ASCIIToUTF16("2334"));
  EXPECT_FALSE(cache.empty());
}

TEST(AnswersCacheTest, GetWillRetrieveMatchingInfo) {
  AnswersCache cache(1);

  base::string16 full_query_text = base::ASCIIToUTF16("weather los angeles");
  base::string16 query_type = base::ASCIIToUTF16("2334");
  cache.UpdateRecentAnswers(full_query_text, query_type);

  // Partial prefixes retrieve info.
  AnswersQueryData data = cache.GetTopAnswerEntry(full_query_text.substr(0, 8));
  EXPECT_EQ(full_query_text, data.full_query_text);
  EXPECT_EQ(query_type, data.query_type);

  // Mismatched prefix retrieves empty data.
  data = cache.GetTopAnswerEntry(full_query_text.substr(1, 8));
  EXPECT_TRUE(data.full_query_text.empty() && data.query_type.empty());

  // Full match retrieves info.
  data = cache.GetTopAnswerEntry(full_query_text);
  EXPECT_EQ(full_query_text, data.full_query_text);
  EXPECT_EQ(query_type, data.query_type);
}

TEST(AnswersCacheTest, MatchMostRecent) {
  AnswersCache cache(2);

  base::string16 query_weather_la = base::ASCIIToUTF16("weather los angeles");
  base::string16 query_weather_lv = base::ASCIIToUTF16("weather las vegas");
  base::string16 query_type = base::ASCIIToUTF16("2334");

  cache.UpdateRecentAnswers(query_weather_lv, query_type);
  cache.UpdateRecentAnswers(query_weather_la, query_type);

  // "weather los angeles" is most recent match to "weather l".
  AnswersQueryData data =
      cache.GetTopAnswerEntry(base::ASCIIToUTF16("weather l"));
  EXPECT_EQ(query_weather_la, data.full_query_text);

  // Update recency for "weather las vegas".
  cache.GetTopAnswerEntry(query_weather_lv);

  // "weather las vegas" should now be the most recent match to "weather l".
  data = cache.GetTopAnswerEntry(base::ASCIIToUTF16("weather l"));
  EXPECT_EQ(query_weather_lv, data.full_query_text);
}

TEST(AnswersCacheTest, LeastRecentItemIsEvicted) {
  AnswersCache cache(2);

  base::string16 query_weather_la = base::ASCIIToUTF16("weather los angeles");
  base::string16 query_weather_lv = base::ASCIIToUTF16("weather las vegas");
  base::string16 query_weather_lb = base::ASCIIToUTF16("weather long beach");
  base::string16 query_type = base::ASCIIToUTF16("2334");

  cache.UpdateRecentAnswers(query_weather_lb, query_type);
  cache.UpdateRecentAnswers(query_weather_lv, query_type);
  EXPECT_FALSE(
      cache.GetTopAnswerEntry(query_weather_lb).full_query_text.empty());
  EXPECT_FALSE(
      cache.GetTopAnswerEntry(query_weather_lv).full_query_text.empty());
  EXPECT_TRUE(
      cache.GetTopAnswerEntry(query_weather_la).full_query_text.empty());

  cache.UpdateRecentAnswers(query_weather_la, query_type);
  EXPECT_TRUE(
      cache.GetTopAnswerEntry(query_weather_lb).full_query_text.empty());
  EXPECT_FALSE(
      cache.GetTopAnswerEntry(query_weather_lv).full_query_text.empty());
  EXPECT_FALSE(
      cache.GetTopAnswerEntry(query_weather_la).full_query_text.empty());
}

TEST(AnswersCacheTest, DuplicateEntries) {
  AnswersCache cache(2);

  base::string16 query_weather_lv = base::ASCIIToUTF16("weather las vegas");
  base::string16 query_weather_lb = base::ASCIIToUTF16("weather long beach");
  base::string16 query_weather_l = base::ASCIIToUTF16("weather l");
  base::string16 query_type = base::ASCIIToUTF16("2334");

  cache.UpdateRecentAnswers(query_weather_lb, query_type);
  cache.UpdateRecentAnswers(query_weather_lv, query_type);

  // Test that duplicate entries update recency.
  cache.UpdateRecentAnswers(query_weather_lb, query_type);
  EXPECT_EQ(query_weather_lb,
            cache.GetTopAnswerEntry(query_weather_l).full_query_text);

  // Test duplicate do not evict other entries. LV should still be in cache.
  cache.UpdateRecentAnswers(query_weather_lb, query_type);
  EXPECT_FALSE(
      cache.GetTopAnswerEntry(query_weather_lv).full_query_text.empty());
}