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#include <algorithm>
#include <map>
#include <string>
#include <utility>
#include <vector>

#include "base/logging.h"
#include "base/port.h"
#include "base/system_util.h"
#include "config/config.pb.h"
#include "config/config_handler.h"
#include "converter/quality_regression_util.h"
#include "engine/chromeos_engine_factory.h"
#include "engine/engine_factory.h"
#include "engine/engine_interface.h"
#include "session/commands.pb.h"
#include "session/request_test_util.h"
#include "testing/base/public/gunit.h"

DECLARE_string(test_tmpdir);

using mozc::quality_regression::QualityRegressionUtil;

namespace mozc {

// Test data is provided in external file.
struct TestCase {
  const bool enabled;
  const char *line;
};
extern TestCase kTestData[];

namespace {

class QualityRegressionTest : public testing::Test {
 protected:
  virtual void SetUp() {
    SystemUtil::SetUserProfileDirectory(FLAGS_test_tmpdir);
    config::Config config;
    config::ConfigHandler::GetDefaultConfig(&config);
    config::ConfigHandler::SetConfig(config);
  }

  virtual void TearDown() {
    config::Config config;
    config::ConfigHandler::GetDefaultConfig(&config);
    config::ConfigHandler::SetConfig(config);
  }

  static void RunTestForPlatform(uint32 platform, QualityRegressionUtil *util) {
    CHECK(util);
    map<string, vector<pair<float, string>>> results, disabled_results;

    int num_executed_cases = 0, num_disabled_cases = 0;
    for (size_t i = 0; kTestData[i].line; ++i) {
      const string &tsv_line = kTestData[i].line;
      QualityRegressionUtil::TestItem item;
      CHECK(item.ParseFromTSV(tsv_line));
      if (!(item.platform & platform)) {
        continue;
      }
      string actual_value;
      const bool test_result = util->ConvertAndTest(item, &actual_value);

      map<string, vector<pair<float, string>>> *table = nullptr;
      if (kTestData[i].enabled) {
        ++num_executed_cases;
        table = &results;
      } else {
        LOG(INFO) << "DISABLED: " << kTestData[i].line;
        ++num_disabled_cases;
        table = &disabled_results;
      }

      const string &label = item.label;
      string line = tsv_line;
      line.append("\tActual: ").append(actual_value);
      if (test_result) {
        // use "-1.0" as a dummy expected ratio
        (*table)[label].push_back(make_pair(-1.0, line));
      } else {
        (*table)[label].push_back(make_pair(item.accuracy, line));
      }
    }

    ExamineResults(true, platform, &results);
    ExamineResults(false, platform, &disabled_results);

    const int total_cases = num_executed_cases + num_disabled_cases;
    LOG(INFO) << "Tested " << num_executed_cases << " / "
              << total_cases << " entries.";
  }

  // If |enabled| parameter is true, then actual conversion results are tested
  // and any failure is reported as test failure.  If false, actual conversion
  // results don't affect test results but closable issues are reported.
  static void ExamineResults(
      const bool enabled, uint32 platform,
      map<string, vector<pair<float, string>>> *results) {
    for (auto it = results->begin(); it != results->end(); ++it) {
      vector<pair<float, string>> *values = &it->second;
      sort(values->begin(), values->end());
      size_t correct = 0;
      bool all_passed = true;
      for (const auto &value : *values) {
        const float accuracy = value.first;
        if (accuracy < 0) {
          ++correct;
          continue;
        }
        // Print failed example for failed label
        const float actual_ratio = 1.0 * correct / values->size();
        if (enabled) {
          EXPECT_LT(accuracy, actual_ratio) << value.second
                                            << " " << accuracy
                                            << " " << actual_ratio;
        } else {
          if (accuracy < actual_ratio) {
            LOG(INFO) << "PASSED (DISABLED): "
                      << it->first << ": " << value.second;
          } else {
            LOG(INFO) << "FAILED (DISABLED): "
                      << it->first << ": " << value.second;
            all_passed = false;
          }
        }
      }
      LOG(INFO) << "Accuracy: " << it->first << " "
                << 1.0 * correct / values->size();
      if (!enabled && all_passed) {
        LOG(INFO) << "CLOSED ISSUE [platform = "
                  << QualityRegressionUtil::GetPlatformString(platform)
                  << "]: " << it->first << " with "
                  << it->second.size() << " cases";
      }
    }
  }
};


TEST_F(QualityRegressionTest, ChromeOSTest) {
  scoped_ptr<EngineInterface> chromeos_engine(ChromeOsEngineFactory::Create());
  QualityRegressionUtil util(chromeos_engine->GetConverter());
  RunTestForPlatform(QualityRegressionUtil::CHROMEOS, &util);
}

// Test for desktop
TEST_F(QualityRegressionTest, BasicTest) {
  scoped_ptr<EngineInterface> engine(EngineFactory::Create());
  QualityRegressionUtil util(engine->GetConverter());
  RunTestForPlatform(QualityRegressionUtil::DESKTOP, &util);
}
}  // namespace
}  // namespace mozc