// Copyright (c) 2006-2008 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 "base/basictypes.h"
#include "base/file_path.h"
#include "base/file_util.h"
#include "base/gfx/jpeg_codec.h"
#include "base/path_service.h"
#include "chrome/browser/history/thumbnail_database.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/thumbnail_score.h"
#include "chrome/tools/profiles/thumbnail-inl.h"
#include "googleurl/src/gurl.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/skia/include/core/SkBitmap.h"

using base::Time;
using base::TimeDelta;

namespace history {

namespace {

// data we'll put into the thumbnail database
static const unsigned char blob1[] =
    "12346102356120394751634516591348710478123649165419234519234512349134";
static const unsigned char blob2[] =
    "goiwuegrqrcomizqyzkjalitbahxfjytrqvpqeroicxmnlkhlzunacxaneviawrtxcywhgef";
static const unsigned char blob3[] =
    "3716871354098370776510470746794707624107647054607467847164027";
const double kBoringness = 0.25;
const double kWorseBoringness = 0.50;
const double kBetterBoringness = 0.10;
const double kTotallyBoring = 1.0;

const int64 kPage1 = 1234;

}  // namespace

class ThumbnailDatabaseTest : public testing::Test {
 public:
  ThumbnailDatabaseTest() {
  }
  ~ThumbnailDatabaseTest() {
  }

 protected:
  // testing::Test
  virtual void SetUp() {
    // get an empty file for the test DB
    FilePath test_data_dir;
    PathService::Get(chrome::DIR_TEST_DATA, &test_data_dir);
    file_name_ = test_data_dir.AppendASCII("TestThumbnails.db");
    file_util::Delete(file_name_, false);

    google_bitmap_.reset(
        JPEGCodec::Decode(kGoogleThumbnail, sizeof(kGoogleThumbnail)));
  }

  virtual void TearDown() {
    file_util::Delete(file_name_, false);
  }

  scoped_ptr<SkBitmap> google_bitmap_;

  FilePath file_name_;
};

TEST_F(ThumbnailDatabaseTest, AddDelete) {
  ThumbnailDatabase db;
  ASSERT_TRUE(db.Init(file_name_, NULL) == INIT_OK);

  // Add one page & verify it got added.
  ThumbnailScore boring(kBoringness, true, true);
  Time time;
  GURL gurl;
  db.SetPageThumbnail(gurl, kPage1, *google_bitmap_, boring, time);
  ThumbnailScore score_output;
  ASSERT_TRUE(db.ThumbnailScoreForId(kPage1, &score_output));
  ASSERT_TRUE(boring.Equals(score_output));

  // Verify a random page is not found.
  int64 page2 = 5678;
  std::vector<unsigned char> jpeg_data;
  EXPECT_FALSE(db.GetPageThumbnail(page2, &jpeg_data));
  EXPECT_FALSE(db.ThumbnailScoreForId(page2, &score_output));

  // Add another page with a better boringness & verify it got added.
  ThumbnailScore better_boringness(kBetterBoringness, true, true);

  db.SetPageThumbnail(gurl, page2, *google_bitmap_, better_boringness, time);
  ASSERT_TRUE(db.ThumbnailScoreForId(page2, &score_output));
  ASSERT_TRUE(better_boringness.Equals(score_output));

  // Delete the thumbnail for the second page.
  ThumbnailScore worse_boringness(kWorseBoringness, true, true);
  db.SetPageThumbnail(gurl, page2, SkBitmap(), worse_boringness, time);
  ASSERT_FALSE(db.GetPageThumbnail(page2, &jpeg_data));
  ASSERT_FALSE(db.ThumbnailScoreForId(page2, &score_output));

  // Delete the first thumbnail using the explicit delete API.
  ASSERT_TRUE(db.DeleteThumbnail(kPage1));

  // Make sure it is gone
  ASSERT_FALSE(db.ThumbnailScoreForId(kPage1, &score_output));
  ASSERT_FALSE(db.GetPageThumbnail(kPage1, &jpeg_data));
  ASSERT_FALSE(db.ThumbnailScoreForId(page2, &score_output));
  ASSERT_FALSE(db.GetPageThumbnail(page2, &jpeg_data));
}

TEST_F(ThumbnailDatabaseTest, UseLessBoringThumbnails) {
  ThumbnailDatabase db;
  Time now = Time::Now();
  ASSERT_TRUE(db.Init(file_name_, NULL) == INIT_OK);

  // Add one page & verify it got added.
  ThumbnailScore boring(kBoringness, true, true);

  Time time;
  GURL gurl;
  db.SetPageThumbnail(gurl, kPage1, *google_bitmap_, boring, time);
  std::vector<unsigned char> jpeg_data;
  ThumbnailScore score_out;
  ASSERT_TRUE(db.GetPageThumbnail(kPage1, &jpeg_data));
  ASSERT_TRUE(db.ThumbnailScoreForId(kPage1, &score_out));
  ASSERT_TRUE(boring.Equals(score_out));

  // Attempt to update the first page entry with a thumbnail that
  // is more boring and verify that it doesn't change.
  ThumbnailScore more_boring(kWorseBoringness, true, true);
  db.SetPageThumbnail(gurl, kPage1, *google_bitmap_, more_boring, time);
  ASSERT_TRUE(db.GetPageThumbnail(kPage1, &jpeg_data));
  ASSERT_TRUE(db.ThumbnailScoreForId(kPage1, &score_out));
  ASSERT_TRUE(boring.Equals(score_out));

  // Attempt to update the first page entry with a thumbnail that
  // is less boring and verify that we update it.
  ThumbnailScore less_boring(kBetterBoringness, true, true);
  db.SetPageThumbnail(gurl, kPage1, *google_bitmap_, less_boring, time);
  ASSERT_TRUE(db.GetPageThumbnail(kPage1, &jpeg_data));
  ASSERT_TRUE(db.ThumbnailScoreForId(kPage1, &score_out));
  ASSERT_TRUE(less_boring.Equals(score_out));
}

TEST_F(ThumbnailDatabaseTest, UseAtTopThumbnails) {
  ThumbnailDatabase db;
  Time now = Time::Now();
  ASSERT_TRUE(db.Init(file_name_, NULL) == INIT_OK);

  // Add one page & verify it got added. Note that it doesn't have
  // |good_clipping| and isn't |at_top|.
  ThumbnailScore boring_and_bad(kBoringness, false, false);

  Time time;
  GURL gurl;
  db.SetPageThumbnail(gurl, kPage1, *google_bitmap_, boring_and_bad, time);
  std::vector<unsigned char> jpeg_data;
  ThumbnailScore score_out;
  ASSERT_TRUE(db.GetPageThumbnail(kPage1, &jpeg_data));
  ASSERT_TRUE(db.ThumbnailScoreForId(kPage1, &score_out));
  ASSERT_TRUE(boring_and_bad.Equals(score_out));

  // A thumbnail that's at the top of the page should replace
  // thumbnails that are in the middle, for the same boringness.
  ThumbnailScore boring_but_better(kBoringness, false, true);
  db.SetPageThumbnail(gurl, kPage1, *google_bitmap_, boring_but_better, time);
  ASSERT_TRUE(db.GetPageThumbnail(kPage1, &jpeg_data));
  ASSERT_TRUE(db.ThumbnailScoreForId(kPage1, &score_out));
  ASSERT_TRUE(boring_but_better.Equals(score_out));

  // The only case where we should replace a thumbnail at the top with
  // a thumbnail in the middle/bottom is when the current thumbnail is
  // weirdly stretched and the incoming thumbnail isn't.
  ThumbnailScore better_boring_bad_framing(kBetterBoringness, false, false);
  db.SetPageThumbnail(gurl, kPage1, *google_bitmap_, better_boring_bad_framing,
                      time);
  ASSERT_TRUE(db.GetPageThumbnail(kPage1, &jpeg_data));
  ASSERT_TRUE(db.ThumbnailScoreForId(kPage1, &score_out));
  ASSERT_TRUE(boring_but_better.Equals(score_out));

  ThumbnailScore boring_good_clipping(kBoringness, true, false);
  db.SetPageThumbnail(gurl, kPage1, *google_bitmap_, boring_good_clipping,
                      time);
  ASSERT_TRUE(db.GetPageThumbnail(kPage1, &jpeg_data));
  ASSERT_TRUE(db.ThumbnailScoreForId(kPage1, &score_out));
  ASSERT_TRUE(boring_good_clipping.Equals(score_out));

  // Now that we have a non-stretched, middle of the page thumbnail,
  // we shouldn't be able to replace it with:

  // 1) A stretched thumbnail in the middle of the page
  db.SetPageThumbnail(gurl, kPage1, *google_bitmap_,
                      ThumbnailScore(kBetterBoringness, false, false, now),
                      time);
  ASSERT_TRUE(db.GetPageThumbnail(kPage1, &jpeg_data));
  ASSERT_TRUE(db.ThumbnailScoreForId(kPage1, &score_out));
  ASSERT_TRUE(boring_good_clipping.Equals(score_out));

  // 2) A stretched thumbnail at the top of the page
  db.SetPageThumbnail(gurl, kPage1, *google_bitmap_,
                      ThumbnailScore(kBetterBoringness, false, true, now),
                      time);
  ASSERT_TRUE(db.GetPageThumbnail(kPage1, &jpeg_data));
  ASSERT_TRUE(db.ThumbnailScoreForId(kPage1, &score_out));
  ASSERT_TRUE(boring_good_clipping.Equals(score_out));

  // But it should be replaced by a thumbnail that's clipped properly
  // and is at the top
  ThumbnailScore best_score(kBetterBoringness, true, true);
  db.SetPageThumbnail(gurl, kPage1, *google_bitmap_, best_score, time);
  ASSERT_TRUE(db.GetPageThumbnail(kPage1, &jpeg_data));
  ASSERT_TRUE(db.ThumbnailScoreForId(kPage1, &score_out));
  ASSERT_TRUE(best_score.Equals(score_out));
}

TEST_F(ThumbnailDatabaseTest, ThumbnailTimeDegradation) {
  ThumbnailDatabase db;
  const Time kNow = Time::Now();
  const Time kThreeHoursAgo = kNow - TimeDelta::FromHours(4);
  const Time kFiveHoursAgo = kNow - TimeDelta::FromHours(6);
  const double kBaseBoringness = 0.305;
  const double kWorseBoringness = 0.345;

  ASSERT_TRUE(db.Init(file_name_, NULL) == INIT_OK);

  // add one page & verify it got added.
  ThumbnailScore base_boringness(kBaseBoringness, true, true, kFiveHoursAgo);

  Time time;
  GURL gurl;
  db.SetPageThumbnail(gurl, kPage1, *google_bitmap_, base_boringness, time);
  std::vector<unsigned char> jpeg_data;
  ThumbnailScore score_out;
  ASSERT_TRUE(db.GetPageThumbnail(kPage1, &jpeg_data));
  ASSERT_TRUE(db.ThumbnailScoreForId(kPage1, &score_out));
  ASSERT_TRUE(base_boringness.Equals(score_out));

  // Try to add a different thumbnail with a worse score an hour later
  // (but not enough to trip the boringness degradation threshold).
  ThumbnailScore hour_later(kWorseBoringness, true, true, kThreeHoursAgo);
  db.SetPageThumbnail(gurl, kPage1, *google_bitmap_, hour_later, time);
  ASSERT_TRUE(db.GetPageThumbnail(kPage1, &jpeg_data));
  ASSERT_TRUE(db.ThumbnailScoreForId(kPage1, &score_out));
  ASSERT_TRUE(base_boringness.Equals(score_out));

  // After a full five hours, things should have degraded enough
  // that we'll allow the same thumbnail with the same (worse)
  // boringness that we previous rejected.
  ThumbnailScore five_hours_later(kWorseBoringness, true, true, kNow);
  db.SetPageThumbnail(gurl, kPage1, *google_bitmap_, five_hours_later, time);
  ASSERT_TRUE(db.GetPageThumbnail(kPage1, &jpeg_data));
  ASSERT_TRUE(db.ThumbnailScoreForId(kPage1, &score_out));
  ASSERT_TRUE(five_hours_later.Equals(score_out));
}

TEST_F(ThumbnailDatabaseTest, NeverAcceptTotallyBoringThumbnail) {
  // We enforce a maximum boringness score: even in cases where we
  // should replace a thumbnail with another because of reasons other
  // than straight up boringness score, still reject because the
  // thumbnail is totally boring.
  ThumbnailDatabase db;
  Time now = Time::Now();
  ASSERT_TRUE(db.Init(file_name_, NULL) == INIT_OK);

  std::vector<unsigned char> jpeg_data;
  ThumbnailScore score_out;
  const double kBaseBoringness = 0.50;
  const Time kNow = Time::Now();
  const int kSizeOfTable = 4;
  struct {
    bool good_scaling;
    bool at_top;
  } const heiarchy_table[] = {
    {false, false},
    {false, true},
    {true, false},
    {true, true}
  };

  Time time;
  GURL gurl;

  // Test that for each entry type, all entry types that are better
  // than it still will reject thumbnails which are totally boring.
  for (int i = 0; i < kSizeOfTable; ++i) {
    ThumbnailScore base(kBaseBoringness,
                        heiarchy_table[i].good_scaling,
                        heiarchy_table[i].at_top,
                        kNow);

    db.SetPageThumbnail(gurl, kPage1, *google_bitmap_, base, time);
    ASSERT_TRUE(db.GetPageThumbnail(kPage1, &jpeg_data));
    ASSERT_TRUE(db.ThumbnailScoreForId(kPage1, &score_out));
    ASSERT_TRUE(base.Equals(score_out));

    for (int j = i; j < kSizeOfTable; ++j) {
      ThumbnailScore shouldnt_replace(
          kTotallyBoring, heiarchy_table[j].good_scaling,
          heiarchy_table[j].at_top, kNow);

      db.SetPageThumbnail(gurl, kPage1, *google_bitmap_, shouldnt_replace,
                          time);
      ASSERT_TRUE(db.GetPageThumbnail(kPage1, &jpeg_data));
      ASSERT_TRUE(db.ThumbnailScoreForId(kPage1, &score_out));
      ASSERT_TRUE(base.Equals(score_out));
    }

    // Clean up for the next iteration
    ASSERT_TRUE(db.DeleteThumbnail(kPage1));
    ASSERT_FALSE(db.GetPageThumbnail(kPage1, &jpeg_data));
    ASSERT_FALSE(db.ThumbnailScoreForId(kPage1, &score_out));
  }

  // We should never accept a totally boring thumbnail no matter how
  // much old the current thumbnail is.
  ThumbnailScore base_boring(kBaseBoringness, true, true, kNow);
  db.SetPageThumbnail(gurl, kPage1, *google_bitmap_, base_boring, time);
  ASSERT_TRUE(db.GetPageThumbnail(kPage1, &jpeg_data));
  ASSERT_TRUE(db.ThumbnailScoreForId(kPage1, &score_out));
  ASSERT_TRUE(base_boring.Equals(score_out));

  ThumbnailScore totally_boring_in_the_future(
      kTotallyBoring, true, true, kNow + TimeDelta::FromDays(365));
  db.SetPageThumbnail(gurl, kPage1, *google_bitmap_,
                      totally_boring_in_the_future, time);
  ASSERT_TRUE(db.GetPageThumbnail(kPage1, &jpeg_data));
  ASSERT_TRUE(db.ThumbnailScoreForId(kPage1, &score_out));
  ASSERT_TRUE(base_boring.Equals(score_out));
}

}  // namespace history