///////////////////////////////////////////////////////////////////////
// File:        apiexample_test.cc
// Description: Progress reporting API Test for Tesseract.
// Author:      Jaroslaw Kubik
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
///////////////////////////////////////////////////////////////////////

// expects clone of tessdata_fast repo in ../../tessdata_fast

#include "include_gunit.h"
#include "gmock/gmock.h"
#include "baseapi.h"
#include "ocrclass.h"
#include "leptonica/allheaders.h"
#include <iostream>
#include <string>
#include <fstream>
#include <locale>
#include <limits.h>
#include <time.h>

namespace {

class QuickTest : public testing::Test {
 protected:
  virtual void SetUp() {
    start_time_ = time(nullptr);
  }
  virtual void TearDown() {
    const time_t end_time = time(nullptr);
    EXPECT_TRUE(end_time - start_time_ <=25) << "The test took too long - " << ::testing::PrintToString(end_time - start_time_);
  }
  time_t start_time_;
  };

  class ClassicMockProgressSink {
  public:
    MOCK_METHOD1(classicProgress, bool( int ) );
    MOCK_METHOD1(cancel, bool( int ));

    ETEXT_DESC monitor;

    ClassicMockProgressSink()
    {
        monitor.progress_callback = []( int progress, int, int, int, int ) ->bool {
          return instance->classicProgress( progress );
        };
        monitor.cancel = []( void* ths, int words ) -> bool {
          return ((ClassicMockProgressSink*)ths)->cancel(words);
        };
        monitor.cancel_this = this;
        instance = this;
    }

    static ClassicMockProgressSink* instance;
  };

  ClassicMockProgressSink* ClassicMockProgressSink::instance = nullptr;

  class NewMockProgressSink : public ClassicMockProgressSink {
  public:
    MOCK_METHOD1(progress, bool( int ) );

    NewMockProgressSink()
    {
        monitor.progress_callback2 = [](ETEXT_DESC* ths, int, int, int, int ) -> bool {
            return ((NewMockProgressSink*)ths->cancel_this)->progress( ths->progress );
        };
    }
  };

  void ClassicProgressTester(const char* imgname, const char* tessdatadir, const char* lang) {
    using ::testing::_;
    using ::testing::AllOf;
    using ::testing::AtLeast;
    using ::testing::DoAll;
    using ::testing::Gt;
    using ::testing::Le;
    using ::testing::Return;
    using ::testing::SaveArg;

    tesseract::TessBaseAPI *api = new tesseract::TessBaseAPI();
    ASSERT_FALSE(api->Init(tessdatadir, lang)) << "Could not initialize tesseract.";
    Pix *image = pixRead(imgname);
    ASSERT_TRUE(image != nullptr) << "Failed to read test image.";
    api->SetImage(image);

    ClassicMockProgressSink progressSink;

    int currentProgress = -1;
    EXPECT_CALL( progressSink, classicProgress(AllOf(Gt<int&>(currentProgress),Le(100))) )
          .Times(AtLeast(5))
          .WillRepeatedly( DoAll(SaveArg<0>(&currentProgress),
                           Return(false) ));
    EXPECT_CALL( progressSink, cancel(_) )
          .Times(AtLeast(5))
          .WillRepeatedly(Return(false));

    EXPECT_EQ( api->Recognize( &progressSink.monitor ), false );
    EXPECT_GE( currentProgress, 50 ) << "The reported progress did not reach 50%";

    api->End();
    pixDestroy(&image);
  }

  void NewProgressTester(const char* imgname, const char* tessdatadir, const char* lang) {
    using ::testing::_;
    using ::testing::AllOf;
    using ::testing::AtLeast;
    using ::testing::DoAll;
    using ::testing::Gt;
    using ::testing::Le;
    using ::testing::Return;
    using ::testing::SaveArg;

    tesseract::TessBaseAPI *api = new tesseract::TessBaseAPI();
    ASSERT_FALSE(api->Init(tessdatadir, lang)) << "Could not initialize tesseract.";
    Pix *image = pixRead(imgname);
    ASSERT_TRUE(image != nullptr) << "Failed to read test image.";
    api->SetImage(image);

    NewMockProgressSink progressSink;

    int currentProgress = -1;
    EXPECT_CALL( progressSink, classicProgress(_) )
          .Times(0);
    EXPECT_CALL( progressSink, progress(AllOf(Gt<int&>(currentProgress),Le(100))) )
          .Times(AtLeast(5))
          .WillRepeatedly( DoAll(SaveArg<0>(&currentProgress),
                           Return(false) ));
    EXPECT_CALL( progressSink, cancel(_) )
          .Times(AtLeast(5))
          .WillRepeatedly(Return(false));

    EXPECT_EQ( api->Recognize( &progressSink.monitor ), false );
    EXPECT_GE( currentProgress, 50 ) << "The reported progress did not reach 50%";

    api->End();
    pixDestroy(&image);
  }

  TEST(QuickTest, ClassicProgressReporitng) {
    ClassicProgressTester(TESTING_DIR "/phototest.tif",
                          TESSDATA_DIR "_fast", "eng");
  }

  TEST(QuickTest, NewProgressReporitng) {
    NewProgressTester(TESTING_DIR "/phototest.tif",
                          TESSDATA_DIR "_fast", "eng");
  }

}  // namespace