// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.
//
// Copyright (C) 2018-2019 Intel Corporation


#include "test_precomp.hpp"

#include <stdexcept>
#include <ade/util/iota_range.hpp>
#include "logger.hpp"

namespace opencv_test
{

namespace
{
    G_TYPED_KERNEL(GInvalidResize, <GMat(GMat,Size,double,double,int)>, "org.opencv.test.invalid_resize")
    {
         static GMatDesc outMeta(GMatDesc in, Size, double, double, int) { return in; }
    };

    GAPI_OCV_KERNEL(GOCVInvalidResize, GInvalidResize)
    {
        static void run(const cv::Mat& in, cv::Size sz, double fx, double fy, int interp, cv::Mat &out)
        {
            cv::resize(in, out, sz, fx, fy, interp);
        }
    };

    G_TYPED_KERNEL(GReallocatingCopy, <GMat(GMat)>, "org.opencv.test.reallocating_copy")
    {
         static GMatDesc outMeta(GMatDesc in) { return in; }
    };

    GAPI_OCV_KERNEL(GOCVReallocatingCopy, GReallocatingCopy)
    {
        static void run(const cv::Mat& in, cv::Mat &out)
        {
            out = in.clone();
        }
    };
}

TEST(GAPI_Pipeline, OverloadUnary_MatMat)
{
    cv::GMat in;
    cv::GComputation comp(in, cv::gapi::bitwise_not(in));

    cv::Mat in_mat = cv::Mat::eye(32, 32, CV_8UC1);
    cv::Mat ref_mat = ~in_mat;

    cv::Mat out_mat;
    comp.apply(in_mat, out_mat);
    EXPECT_EQ(0, cv::countNonZero(out_mat != ref_mat));

    out_mat = cv::Mat();
    auto cc = comp.compile(cv::descr_of(in_mat));
    cc(in_mat, out_mat);
    EXPECT_EQ(0, cv::countNonZero(out_mat != ref_mat));
}

TEST(GAPI_Pipeline, OverloadUnary_MatScalar)
{
    cv::GMat in;
    cv::GComputation comp(in, cv::gapi::sum(in));

    cv::Mat in_mat = cv::Mat::eye(32, 32, CV_8UC1);
    cv::Scalar ref_scl = cv::sum(in_mat);

    cv::Scalar out_scl;
    comp.apply(in_mat, out_scl);
    EXPECT_EQ(out_scl, ref_scl);

    out_scl = cv::Scalar();
    auto cc = comp.compile(cv::descr_of(in_mat));
    cc(in_mat, out_scl);
    EXPECT_EQ(out_scl, ref_scl);
}

TEST(GAPI_Pipeline, OverloadBinary_Mat)
{
    cv::GMat a, b;
    cv::GComputation comp(a, b, cv::gapi::add(a, b));

    cv::Mat in_mat = cv::Mat::eye(32, 32, CV_8UC1);
    cv::Mat ref_mat = (in_mat+in_mat);

    cv::Mat out_mat;
    comp.apply(in_mat, in_mat, out_mat);
    EXPECT_EQ(0, cv::countNonZero(out_mat != ref_mat));

    out_mat = cv::Mat();
    auto cc = comp.compile(cv::descr_of(in_mat), cv::descr_of(in_mat));
    cc(in_mat, in_mat, out_mat);
    EXPECT_EQ(0, cv::countNonZero(out_mat != ref_mat));
}

TEST(GAPI_Pipeline, OverloadBinary_Scalar)
{
    cv::GMat a, b;
    cv::GComputation comp(a, b, cv::gapi::sum(a + b));

    cv::Mat in_mat = cv::Mat::eye(32, 32, CV_8UC1);
    cv::Scalar ref_scl = cv::sum(in_mat+in_mat);

    cv::Scalar out_scl;
    comp.apply(in_mat, in_mat, out_scl);
    EXPECT_EQ(out_scl, ref_scl);

    out_scl = cv::Scalar();
    auto cc = comp.compile(cv::descr_of(in_mat), cv::descr_of(in_mat));
    cc(in_mat, in_mat, out_scl);
    EXPECT_EQ(out_scl, ref_scl);
}

TEST(GAPI_Pipeline, Sharpen)
{
    const cv::Size sz_in (1280, 720);
    const cv::Size sz_out( 640, 480);
    cv::Mat in_mat (sz_in,  CV_8UC3);
    in_mat = cv::Scalar(128, 33, 53);

    cv::Mat out_mat(sz_out, CV_8UC3);
    cv::Mat out_mat_y;
    cv::Mat out_mat_ocv(sz_out, CV_8UC3);

    float sharpen_coeffs[] = {
         0.0f, -1.f,  0.0f,
        -1.0f,  5.f, -1.0f,
         0.0f, -1.f,  0.0f
    };
    cv::Mat sharpen_kernel(3, 3, CV_32F, sharpen_coeffs);

    // G-API code //////////////////////////////////////////////////////////////

    cv::GMat in;
    auto vga     = cv::gapi::resize(in, sz_out);
    auto yuv     = cv::gapi::RGB2YUV(vga);
    auto yuv_p   = cv::gapi::split3(yuv);
    auto y_sharp = cv::gapi::filter2D(std::get<0>(yuv_p), -1, sharpen_kernel);
    auto yuv_new = cv::gapi::merge3(y_sharp, std::get<1>(yuv_p), std::get<2>(yuv_p));
    auto out     = cv::gapi::YUV2RGB(yuv_new);

    cv::GComputation c(cv::GIn(in), cv::GOut(y_sharp, out));
    c.apply(cv::gin(in_mat), cv::gout(out_mat_y, out_mat));

    // OpenCV code /////////////////////////////////////////////////////////////
    {
        cv::Mat smaller;
        cv::resize(in_mat, smaller, sz_out);

        cv::Mat yuv_mat;
        cv::cvtColor(smaller, yuv_mat, cv::COLOR_RGB2YUV);
        std::vector<cv::Mat> yuv_planar(3);
        cv::split(yuv_mat, yuv_planar);
        cv::filter2D(yuv_planar[0], yuv_planar[0], -1, sharpen_kernel);
        cv::merge(yuv_planar, yuv_mat);
        cv::cvtColor(yuv_mat, out_mat_ocv, cv::COLOR_YUV2RGB);
    }

    // Comparison //////////////////////////////////////////////////////////////
    {
        cv::Mat diff = out_mat_ocv != out_mat;
        std::vector<cv::Mat> diffBGR(3);
        cv::split(diff, diffBGR);
        EXPECT_EQ(0, cv::countNonZero(diffBGR[0]));
        EXPECT_EQ(0, cv::countNonZero(diffBGR[1]));
        EXPECT_EQ(0, cv::countNonZero(diffBGR[2]));
    }

    // Metadata check /////////////////////////////////////////////////////////
    {
        auto cc    = c.compile(cv::descr_of(in_mat));
        auto metas = cc.outMetas();
        ASSERT_EQ(2u, metas.size());

        auto out_y_meta = cv::util::get<cv::GMatDesc>(metas[0]);
        auto out_meta   = cv::util::get<cv::GMatDesc>(metas[1]);

        // Y-output
        EXPECT_EQ(CV_8U,   out_y_meta.depth);
        EXPECT_EQ(1,       out_y_meta.chan);
        EXPECT_EQ(640,     out_y_meta.size.width);
        EXPECT_EQ(480,     out_y_meta.size.height);

        // Final output
        EXPECT_EQ(CV_8U,   out_meta.depth);
        EXPECT_EQ(3,       out_meta.chan);
        EXPECT_EQ(640,     out_meta.size.width);
        EXPECT_EQ(480,     out_meta.size.height);
    }
}

TEST(GAPI_Pipeline, CustomRGB2YUV)
{
    const cv::Size sz(1280, 720);

    // BEWARE:
    //
    //    std::vector<cv::Mat> out_mats_cv(3, cv::Mat(sz, CV_8U))
    //
    // creates a vector of 3 elements pointing to the same Mat!
    // FIXME: Make a G-API check for that
    const int INS = 3;
    std::vector<cv::Mat> in_mats(INS);
    for (auto i : ade::util::iota(INS))
    {
        in_mats[i].create(sz, CV_8U);
        cv::randu(in_mats[i], cv::Scalar::all(0), cv::Scalar::all(255));
    }

    const int OUTS = 3;
    std::vector<cv::Mat> out_mats_cv(OUTS);
    std::vector<cv::Mat> out_mats_gapi(OUTS);
    for (auto i : ade::util::iota(OUTS))
    {
        out_mats_cv  [i].create(sz, CV_8U);
        out_mats_gapi[i].create(sz, CV_8U);
    }

    // G-API code //////////////////////////////////////////////////////////////
    {
        cv::GMat r, g, b;
        cv::GMat y = 0.299f*r + 0.587f*g + 0.114f*b;
        cv::GMat u = 0.492f*(b - y);
        cv::GMat v = 0.877f*(r - y);

        cv::GComputation customCvt({r, g, b}, {y, u, v});
        customCvt.apply(in_mats, out_mats_gapi);
    }

    // OpenCV code /////////////////////////////////////////////////////////////
    {
        cv::Mat r = in_mats[0], g = in_mats[1], b = in_mats[2];
        cv::Mat y = 0.299f*r + 0.587f*g + 0.114f*b;
        cv::Mat u = 0.492f*(b - y);
        cv::Mat v = 0.877f*(r - y);

        out_mats_cv[0] = y;
        out_mats_cv[1] = u;
        out_mats_cv[2] = v;
    }

    // Comparison //////////////////////////////////////////////////////////////
    {
        const auto diff = [](cv::Mat m1, cv::Mat m2, int t) {
            return cv::abs(m1-m2) > t;
        };

        // FIXME: Not bit-accurate even now!
        cv::Mat
            diff_y = diff(out_mats_cv[0], out_mats_gapi[0], 2),
            diff_u = diff(out_mats_cv[1], out_mats_gapi[1], 2),
            diff_v = diff(out_mats_cv[2], out_mats_gapi[2], 2);

        EXPECT_EQ(0, cv::countNonZero(diff_y));
        EXPECT_EQ(0, cv::countNonZero(diff_u));
        EXPECT_EQ(0, cv::countNonZero(diff_v));
    }
}

TEST(GAPI_Pipeline, PipelineWithInvalidKernel)
{
    cv::GMat in, out;
    cv::Mat in_mat(500, 500, CV_8UC1), out_mat;
    out = GInvalidResize::on(in, cv::Size(300, 300), 0.0, 0.0, cv::INTER_LINEAR);

    const auto pkg = cv::gapi::kernels<GOCVInvalidResize>();
    cv::GComputation comp(cv::GIn(in), cv::GOut(out));

    EXPECT_THROW(comp.apply(in_mat, out_mat, cv::compile_args(pkg)), std::logic_error);
}

TEST(GAPI_Pipeline, InvalidOutputComputation)
{
    cv::GMat in1, out1, out2, out3;

    std::tie(out1, out2, out2) = cv::gapi::split3(in1);
    cv::GComputation c({in1}, {out1, out2, out3});
    cv::Mat in_mat;
    cv::Mat out_mat1, out_mat2, out_mat3, out_mat4;
    std::vector<cv::Mat> u_outs = {out_mat1, out_mat2, out_mat3, out_mat4};
    std::vector<cv::Mat> u_ins = {in_mat};

    EXPECT_THROW(c.apply(u_ins, u_outs), std::logic_error);
}

TEST(GAPI_Pipeline, PipelineAllocatingKernel)
{
    cv::GMat in, out;
    cv::Mat in_mat(500, 500, CV_8UC1), out_mat;
    out = GReallocatingCopy::on(in);

    const auto pkg = cv::gapi::kernels<GOCVReallocatingCopy>();
    cv::GComputation comp(cv::GIn(in), cv::GOut(out));

    EXPECT_THROW(comp.apply(in_mat, out_mat, cv::compile_args(pkg)), std::logic_error);
}
} // namespace opencv_test
