// SPDX-License-Identifier: GPL-2.0-or-later
/** @file
 * Test for SVG colors
 *//*
 * Authors: see git history
 *
 * Copyright (C) 2010 Authors
 * Released under GNU GPL v2+, read the file 'COPYING' for more information.
 */
#include <cstdlib>
#include <math.h>
#include <gtest/gtest.h>
#include <glib.h>

#include "svg/svg.h"
#include <2geom/affine.h>


struct test_t
{
    char const *str;
    Geom::Affine matrix;
};

static double const DEGREE = M_PI / 180.;

test_t const read_matrix_tests[5] = {{"matrix(0,0,0,0,0,0)", Geom::Affine(0, 0, 0, 0, 0, 0)},
                                     {" matrix(1,2,3,4,5,6)", Geom::Affine(1, 2, 3, 4, 5, 6)},
                                     {"matrix (1 2 -3,-4,5e6,-6e-7)", Geom::Affine(1, 2, -3, -4, 5e6, -6e-7)},
                                     {"matrix(1,2,3,4,5e6-3)", Geom::Affine(1, 2, 3, 4, 5e6, -3)},
                                     {"matrix(1,2,3,4,5e6.3)", Geom::Affine(1, 2, 3, 4, 5e6, 0.3)}};
test_t const read_translate_tests[3] = {{"translate(1)", Geom::Affine(1, 0, 0, 1, 1, 0)},
                                        {"translate(1,1)", Geom::Affine(1, 0, 0, 1, 1, 1)},
                                        {"translate(-1e3 .123e2)", Geom::Affine(1, 0, 0, 1, -1e3, .123e2)}};
test_t const read_scale_tests[3] = {{"scale(2)", Geom::Affine(2, 0, 0, 2, 0, 0)},
                                    {"scale(2,3)", Geom::Affine(2, 0, 0, 3, 0, 0)},
                                    {"scale(0.1e-2 -.475e0)", Geom::Affine(0.1e-2, 0, 0, -.475e0, 0, 0)}};
test_t const read_rotate_tests[4] = {
    {"rotate(13 )", Geom::Affine(cos(13. * DEGREE), sin(13. * DEGREE), -sin(13. * DEGREE), cos(13. * DEGREE), 0, 0)},
    {"rotate(-13)",
     Geom::Affine(cos(-13. * DEGREE), sin(-13. * DEGREE), -sin(-13. * DEGREE), cos(-13. * DEGREE), 0, 0)},
    {"rotate(373)", Geom::Affine(cos(13. * DEGREE), sin(13. * DEGREE), -sin(13. * DEGREE), cos(13. * DEGREE), 0, 0)},
    {"rotate(13,7,11)", Geom::Affine(cos(13. * DEGREE), sin(13. * DEGREE), -sin(13. * DEGREE), cos(13. * DEGREE),
                                     (1 - cos(13. * DEGREE)) * 7 + sin(13. * DEGREE) * 11,
                                     (1 - cos(13. * DEGREE)) * 11 - sin(13. * DEGREE) * 7)}};
test_t const read_skew_tests[3] = {{"skewX( 30)", Geom::Affine(1, 0, tan(30. * DEGREE), 1, 0, 0)},
                                   {"skewX(-30)", Geom::Affine(1, 0, tan(-30. * DEGREE), 1, 0, 0)},
                                   {"skewY(390)", Geom::Affine(1, tan(30. * DEGREE), 0, 1, 0, 0)}};
char const *const read_fail_tests[25] = {
    "matrix((1,2,3,4,5,6)",
    "matrix((1,2,3,4,5,6))",
    "matrix(1,2,3,4,5,6))",
    "matrix(,1,2,3,4,5,6)",
    "matrix(1,2,3,4,5,6,)",
    "matrix(1,2,3,4,5,)",
    "matrix(1,2,3,4,5)",
    "translate()",
    "translate(,)",
    "translate(1,)",
    "translate(1,6,)",
    "translate(1,6,0)",
    "scale()",
    "scale(1,6,2)",
    "rotate()",
    "rotate(1,6)",
    "rotate(1,6,)",
    "rotate(1,6,3,4)",
    "skewX()",
    "skewX(-)",
    "skewX(.)",
    "skewY(,)",
    "skewY(1,2)"};
test_t const write_matrix_tests[2] = {
    {"matrix(1,2,3,4,5,6)", Geom::Affine(1, 2, 3, 4, 5, 6)},
    {"matrix(-1,2123,3,0.4,1e-8,1e20)", Geom::Affine(-1, 2.123e3, 3 + 1e-14, 0.4, 1e-8, 1e20)}};
test_t const write_translate_tests[3] = {{"translate(1,1)", Geom::Affine(1, 0, 0, 1, 1, 1)},
                                         {"translate(1)", Geom::Affine(1, 0, 0, 1, 1, 0)},
                                         {"translate(-1345,0.123)", Geom::Affine(1, 0, 0, 1, -1.345e3, .123)}};
test_t const write_scale_tests[3] = {{"scale(0)", Geom::Affine(0, 0, 0, 0, 0, 0)},
                                     {"scale(7)", Geom::Affine(7, 0, 0, 7, 0, 0)},
                                     {"scale(2,3)", Geom::Affine(2, 0, 0, 3, 0, 0)}};
test_t const write_rotate_tests[3] = {
    {"rotate(13)", Geom::Affine(cos(13. * DEGREE), sin(13. * DEGREE), -sin(13. * DEGREE), cos(13. * DEGREE), 0, 0)},
    {"rotate(-13,7,11)", Geom::Affine(cos(-13. * DEGREE), sin(-13. * DEGREE), -sin(-13. * DEGREE), cos(-13. * DEGREE),
                                      (1 - cos(-13. * DEGREE)) * 7 + sin(-13. * DEGREE) * 11,
                                      (1 - cos(-13. * DEGREE)) * 11 - sin(-13. * DEGREE) * 7)},
    {"rotate(-34.5,6.7,89)",
     Geom::Affine(cos(-34.5 * DEGREE), sin(-34.5 * DEGREE), -sin(-34.5 * DEGREE), cos(-34.5 * DEGREE),
                  (1 - cos(-34.5 * DEGREE)) * 6.7 + sin(-34.5 * DEGREE) * 89,
                  (1 - cos(-34.5 * DEGREE)) * 89 - sin(-34.5 * DEGREE) * 6.7)}};
test_t const write_skew_tests[3] = {{"skewX(30)", Geom::Affine(1, 0, tan(30. * DEGREE), 1, 0, 0)},
                                    {"skewX(-30)", Geom::Affine(1, 0, tan(-30. * DEGREE), 1, 0, 0)},
                                    {"skewY(30)", Geom::Affine(1, tan(30. * DEGREE), 0, 1, 0, 0)}};

bool approx_equal_pred(Geom::Affine const &ref, Geom::Affine const &cm)
{
    double maxabsdiff = 0;
    for (size_t i = 0; i < 6; i++) {
        maxabsdiff = std::max(std::abs(ref[i] - cm[i]), maxabsdiff);
    }
    return maxabsdiff < 1e-14;
}

TEST(SvgAffineTest, testReadIdentity)
{
    char const *strs[] = {// 0,
                          " ", "",        "matrix(1,0,0,1,0,0)", "translate(0,0)", "scale(1,1)", "rotate(0,0,0)", "skewX(0)",
                          "skewY(0)"};
    size_t n = G_N_ELEMENTS(strs);
    for (size_t i = 0; i < n; i++) {
        Geom::Affine cm;
        EXPECT_TRUE(sp_svg_transform_read(strs[i], &cm)) << i;
        ASSERT_EQ(Geom::identity(), cm) << strs[i];
    }
}

TEST(SvgAffineTest, testWriteIdentity)
{
    auto str = sp_svg_transform_write(Geom::identity());
    ASSERT_TRUE(str == "");
}

TEST(SvgAffineTest, testReadMatrix)
{
    for (size_t i = 0; i < G_N_ELEMENTS(read_matrix_tests); i++) {
        Geom::Affine cm;
        ASSERT_TRUE(sp_svg_transform_read(read_matrix_tests[i].str, &cm)) << read_matrix_tests[i].str;
        ASSERT_TRUE(approx_equal_pred(read_matrix_tests[i].matrix, cm)) << read_matrix_tests[i].str;
    }
}

TEST(SvgAffineTest, testReadTranslate)
{
    for (size_t i = 0; i < G_N_ELEMENTS(read_translate_tests); i++) {
        Geom::Affine cm;
        ASSERT_TRUE(sp_svg_transform_read(read_translate_tests[i].str, &cm)) << read_translate_tests[i].str;
        ASSERT_TRUE(approx_equal_pred(read_translate_tests[i].matrix, cm)) << read_translate_tests[i].str;
    }
}

TEST(SvgAffineTest, testReadScale)
{
    for (size_t i = 0; i < G_N_ELEMENTS(read_scale_tests); i++) {
        Geom::Affine cm;
        ASSERT_TRUE(sp_svg_transform_read(read_scale_tests[i].str, &cm)) << read_scale_tests[i].str;
        ASSERT_TRUE(approx_equal_pred(read_scale_tests[i].matrix, cm)) << read_scale_tests[i].str;
    }
}

TEST(SvgAffineTest, testReadRotate)
{
    for (size_t i = 0; i < G_N_ELEMENTS(read_rotate_tests); i++) {
        Geom::Affine cm;
        ASSERT_TRUE(sp_svg_transform_read(read_rotate_tests[i].str, &cm)) << read_rotate_tests[i].str;
        ASSERT_TRUE(approx_equal_pred(read_rotate_tests[i].matrix, cm)) << read_rotate_tests[i].str;
    }
}

TEST(SvgAffineTest, testReadSkew)
{
    for (size_t i = 0; i < G_N_ELEMENTS(read_skew_tests); i++) {
        Geom::Affine cm;
        ASSERT_TRUE(sp_svg_transform_read(read_skew_tests[i].str, &cm)) << read_skew_tests[i].str;
        ASSERT_TRUE(approx_equal_pred(read_skew_tests[i].matrix, cm)) << read_skew_tests[i].str;
    }
}

TEST(SvgAffineTest, testWriteMatrix)
{
    for (size_t i = 0; i < G_N_ELEMENTS(write_matrix_tests); i++) {
        auto str = sp_svg_transform_write(write_matrix_tests[i].matrix);
        ASSERT_TRUE(!strcmp(str.c_str(), write_matrix_tests[i].str));
    }
}

TEST(SvgAffineTest, testWriteTranslate)
{
    for (size_t i = 0; i < G_N_ELEMENTS(write_translate_tests); i++) {
        auto str = sp_svg_transform_write(write_translate_tests[i].matrix);
        ASSERT_TRUE(!strcmp(str.c_str(), write_translate_tests[i].str));
    }
}

TEST(SvgAffineTest, testWriteScale)
{
    for (size_t i = 0; i < G_N_ELEMENTS(write_scale_tests); i++) {
        auto str = sp_svg_transform_write(write_scale_tests[i].matrix);
        ASSERT_TRUE(!strcmp(str.c_str(), write_scale_tests[i].str));
    }
}

TEST(SvgAffineTest, testWriteRotate)
{
    for (size_t i = 0; i < G_N_ELEMENTS(write_rotate_tests); i++) {
        auto str = sp_svg_transform_write(write_rotate_tests[i].matrix);
        ASSERT_TRUE(!strcmp(str.c_str(), write_rotate_tests[i].str));
    }
}

TEST(SvgAffineTest, testWriteSkew)
{
    for (size_t i = 0; i < G_N_ELEMENTS(write_skew_tests); i++) {
        auto str = sp_svg_transform_write(write_skew_tests[i].matrix);
        ASSERT_TRUE(!strcmp(str.c_str(), write_skew_tests[i].str));
    }
}

TEST(SvgAffineTest, testReadConcatenation)
{
    char const *str = "skewY(17)skewX(9)translate(7,13)scale(2)rotate(13)translate(3,5)";
    Geom::Affine ref(2.0199976232558053, 1.0674773585906016, -0.14125199392774669, 1.9055550612095459,
                     14.412730624347654, 28.499820929377454); // Precomputed using Mathematica
    Geom::Affine cm;
    ASSERT_TRUE(sp_svg_transform_read(str, &cm));
    ASSERT_TRUE(approx_equal_pred(ref, cm));
}

TEST(SvgAffineTest, testReadFailures)
{
    for (size_t i = 0; i < G_N_ELEMENTS(read_fail_tests); i++) {
        Geom::Affine cm;
        EXPECT_FALSE(sp_svg_transform_read(read_fail_tests[i], &cm)) << read_fail_tests[i];
    }
}

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