// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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.

#include <gtest/gtest.h>
#include "util/frame_of_reference_coding.h"

namespace doris {
class TestForCoding : public testing::Test {
public:
    static void test_frame_of_reference_encode_decode(int32_t element_size) {
        faststring buffer(1);
        ForEncoder<int32_t> encoder(&buffer);

        std::vector<int32_t> data;
        for (int32_t i = 0; i < element_size; ++i) {
            data.push_back(i);
        }
        encoder.put_batch(data.data(), element_size);
        encoder.flush();

        ForDecoder<int32_t> decoder(buffer.data(), buffer.length());
        decoder.init();
        std::vector<int32_t> actual_result(element_size);
        decoder.get_batch(actual_result.data(), element_size);

        ASSERT_EQ(data, actual_result);
    }

    static void test_skip(int32_t skip_num) {
        faststring buffer(1);
        ForEncoder<uint32_t> encoder(&buffer);

        std::vector<uint32_t> input_data;
        std::vector<uint32_t> expect_result;
        for (uint32_t i = 0; i < 256; ++i) {
            input_data.push_back(i);
            if (i >= skip_num) {
                expect_result.push_back(i);
            }
        }
        encoder.put_batch(input_data.data(), 256);
        encoder.flush();

        ForDecoder<uint32_t> decoder(buffer.data(), buffer.length());
        decoder.init();
        decoder.skip(skip_num);

        std::vector<uint32_t> actual_result(256 - skip_num);
        decoder.get_batch(actual_result.data(), 256 - skip_num);

        ASSERT_EQ(expect_result, actual_result);
    }
};


TEST_F(TestForCoding, TestHalfFrame) {
    test_frame_of_reference_encode_decode(64);
}

TEST_F(TestForCoding, TestOneFrame) {
    test_frame_of_reference_encode_decode(128);
}

TEST_F(TestForCoding, TestTwoFrame) {
    test_frame_of_reference_encode_decode(256);
}

TEST_F(TestForCoding, TestTwoHlafFrame) {
    test_frame_of_reference_encode_decode(320);
}

TEST_F(TestForCoding, TestSkipZero) {
    test_skip(0);
}

TEST_F(TestForCoding, TestSkipHalfFrame) {
    test_skip(64);
}

TEST_F(TestForCoding, TestSkipOneFrame) {
    test_skip(128);
}

TEST_F(TestForCoding, TestInt64) {
    faststring buffer(1);
    ForEncoder<int64_t> encoder(&buffer);

    std::vector<int64_t> data;
    for (int64_t i = 0; i < 320; ++i) {
        data.push_back(i);
    }
    encoder.put_batch(data.data(), 320);
    encoder.flush();

    ForDecoder<int64_t> decoder(buffer.data(), buffer.length());
    decoder.init();
    std::vector<int64_t> actual_result(320);
    decoder.get_batch(actual_result.data(), 320);

    ASSERT_EQ(data, actual_result);
}

TEST_F(TestForCoding, TestOneMinValue) {
    faststring buffer(1);
    ForEncoder<int32_t> encoder(&buffer);
    encoder.put(2019);
    encoder.flush();

    ForDecoder<int32_t> decoder(buffer.data(), buffer.length());
    decoder.init();
    int32_t actual_value;
    decoder.get(&actual_value);
    ASSERT_EQ(2019, actual_value);
}

TEST_F(TestForCoding, TestZeroValue) {
    faststring buffer(1);
    ForEncoder<int32_t> encoder(&buffer);
    encoder.flush();

    ASSERT_EQ(buffer.length(), 4 + 1);

    ForDecoder<int32_t> decoder(buffer.data(), buffer.length());
    decoder.init();
    int32_t actual_value;
    bool result = decoder.get(&actual_value);
    ASSERT_EQ(result, false);
}

TEST_F(TestForCoding, TestBytesAlign) {
    faststring buffer(1);
    ForEncoder<int32_t> encoder(&buffer);
    encoder.put(2019);
    encoder.put(2020);
    encoder.flush();

    ForDecoder<int32_t> decoder(buffer.data(), buffer.length());
    decoder.init();

    int32_t actual_value;
    decoder.get(&actual_value);
    ASSERT_EQ(2019, actual_value);
    decoder.get(&actual_value);
    ASSERT_EQ(2020, actual_value);
}

TEST_F(TestForCoding, TestValueSeekSpecialCase) {
    faststring buffer(1);
    ForEncoder<int64_t> encoder(&buffer);

    std::vector<int64_t> data;
    for (int64_t i = 0; i < 128; ++i) {
        data.push_back(i);
    }

    for (int64_t i = 300; i < 500; ++i) {
        data.push_back(i);
    }

    encoder.put_batch(data.data(), data.size());
    encoder.flush();

    ForDecoder<int64_t> decoder(buffer.data(), buffer.length());
    decoder.init();

    int64_t target = 160;
    bool exact_match;
    bool has_value = decoder.seek_at_or_after_value(&target, &exact_match);
    ASSERT_EQ(has_value, true);
    ASSERT_EQ(exact_match, false);

    int64_t next_value;
    decoder.get(&next_value);
    ASSERT_EQ(300, next_value);
}

TEST_F(TestForCoding, TestValueSeek) {
    faststring buffer(1);
    ForEncoder<int64_t> encoder(&buffer);

    const int64_t SIZE = 320;
    std::vector<int64_t> data;
    for (int64_t i = 0; i < SIZE; ++i) {
        data.push_back(i);
    }
    encoder.put_batch(data.data(), SIZE);
    encoder.flush();

    ForDecoder<int64_t> decoder(buffer.data(), buffer.length());
    decoder.init();

    int64_t target = 160;
    bool exact_match;
    bool found = decoder.seek_at_or_after_value(&target, &exact_match);
    ASSERT_EQ(found, true);
    ASSERT_EQ(exact_match, true);

    int64_t actual_value;
    decoder.get(&actual_value);
    ASSERT_EQ(target, actual_value);

    target = -1;
    found = decoder.seek_at_or_after_value(&target, &exact_match);
    ASSERT_EQ(found, true);
    ASSERT_EQ(exact_match, false);

    std::vector<int64_t> actual_result(SIZE);
    decoder.get_batch(actual_result.data(), SIZE);
    ASSERT_EQ(data, actual_result);

    target = 0;
    found = decoder.seek_at_or_after_value(&target, &exact_match);
    ASSERT_EQ(found, true);
    ASSERT_EQ(exact_match, true);

    decoder.get_batch(actual_result.data(), SIZE);
    ASSERT_EQ(data, actual_result);

    target = 319;
    found = decoder.seek_at_or_after_value(&target, &exact_match);
    ASSERT_EQ(found, true);
    ASSERT_EQ(exact_match, true);

    decoder.get(&actual_value);
    ASSERT_EQ(target, actual_value);

    target = 320;
    found = decoder.seek_at_or_after_value(&target, &exact_match);
    ASSERT_EQ(found, false);
}

}

int main(int argc, char** argv) {
    testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
}