/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

#include <gtest/gtest.h>

#include <react/renderer/components/view/BaseViewProps.h>

namespace facebook::react {

namespace {

// For transforms involving rotations, use this helper to fix floating point
// accuracies
void expectTransformsEqual(const Transform& t1, const Transform& t2) {
  for (int i = 0; i < 16; i++) {
    EXPECT_NEAR(t1.matrix[i], t2.matrix[i], 0.0001);
  }
}

} // namespace

class ResolveTransformTest : public ::testing::Test {
 protected:
  TransformOrigin createTransformOriginPoints(float x, float y, float z = 0) {
    TransformOrigin origin;
    origin.xy[0] = ValueUnit(x, UnitType::Point);
    origin.xy[1] = ValueUnit(y, UnitType::Point);
    origin.z = z;
    return origin;
  }

  TransformOrigin createTransformOriginPercent(float x, float y, float z = 0) {
    TransformOrigin origin;
    origin.xy[0] = ValueUnit(x, UnitType::Percent);
    origin.xy[1] = ValueUnit(y, UnitType::Percent);
    origin.z = z;
    return origin;
  }
};

TEST_F(ResolveTransformTest, EmptyFrameNoTransformOrigin) {
  Size frameSize{.width = 0, .height = 0};
  Transform transform = Transform::Translate(10.0, 20.0, 0.0);
  TransformOrigin transformOrigin; // Default (not set)

  auto result =
      BaseViewProps::resolveTransform(frameSize, transform, transformOrigin);

  // With empty frame size and no transform origin, should just apply the
  // transform directly
  EXPECT_EQ(result.matrix, transform.matrix);
}

TEST_F(ResolveTransformTest, EmptyFrameTransformOriginPoints) {
  Size frameSize{.width = 0, .height = 0};
  Transform transform = Transform::Translate(10.0, 20.0, 0.0);
  TransformOrigin transformOrigin = createTransformOriginPoints(5, 8);

  auto result =
      BaseViewProps::resolveTransform(frameSize, transform, transformOrigin);

  // Should handle transform origin even with empty frame size
  EXPECT_EQ(result.matrix, Transform::Translate(10.0, 20.0, 0.0).matrix);
}

TEST_F(ResolveTransformTest, EmptyFrameTransformOriginPercent) {
  Size frameSize{.width = 0, .height = 0};
  Transform transform = Transform::Translate(10.0, 20.0, 0.0);
  TransformOrigin transformOrigin = createTransformOriginPercent(50, 50);

  auto result =
      BaseViewProps::resolveTransform(frameSize, transform, transformOrigin);

  // Transform origin does not affect translate transform
  EXPECT_EQ(result.matrix, Transform::Translate(10.0, 20.0, 0.0).matrix);
}

TEST_F(ResolveTransformTest, NonEmptyFrameNoTransformOrigin) {
  Size frameSize{.width = 100, .height = 200};
  Transform transform = Transform::Translate(10.0, 20.0, 0.0);
  TransformOrigin transformOrigin; // Default (not set)

  auto result =
      BaseViewProps::resolveTransform(frameSize, transform, transformOrigin);

  // Transform origin does not affect translate transform
  EXPECT_EQ(result.matrix, Transform::Translate(10.0, 20.0, 0.0).matrix);
}

TEST_F(ResolveTransformTest, NonEmptyFrameTransformOriginPoints) {
  Size frameSize{.width = 100, .height = 200};
  Transform transform = Transform::Scale(2.0, 1.5, 0.);
  TransformOrigin transformOrigin = createTransformOriginPoints(25, 50);

  auto result =
      BaseViewProps::resolveTransform(frameSize, transform, transformOrigin);

  auto expected = Transform::Translate(25.0, 25.0, 0.0) * transform;
  EXPECT_EQ(result.matrix, expected.matrix);
}

TEST_F(ResolveTransformTest, NonEmptyFrameTransformOriginPercent) {
  Size frameSize{.width = 100, .height = 200};
  Transform transform = Transform::Scale(2.0, 1.5, 0.);
  TransformOrigin transformOrigin =
      createTransformOriginPercent(25, 75); // 25% width, 75% height

  auto result =
      BaseViewProps::resolveTransform(frameSize, transform, transformOrigin);

  // Should resolve percentages: 25% of 100 = 25, 75% of 200 = 150
  auto expected = Transform::Translate(25.0, -25.0, 0.0) * transform;
  EXPECT_EQ(result.matrix, expected.matrix);
}

TEST_F(ResolveTransformTest, IdentityTransformWithOrigin) {
  Size frameSize{.width = 100, .height = 200};
  Transform transform = Transform::Identity();
  TransformOrigin transformOrigin = createTransformOriginPoints(25, 50);

  auto result =
      BaseViewProps::resolveTransform(frameSize, transform, transformOrigin);

  // Even with identity transform, transform origin should still apply
  // translations but they should cancel out, resulting in identity
  EXPECT_EQ(result.matrix, transform.matrix);
}

TEST_F(ResolveTransformTest, MultipleTransformOperations) {
  Size frameSize{.width = 100, .height = 200};

  Transform transform = Transform::Identity();
  transform = transform * Transform::Translate(10.0, 20.0, 0.0);
  transform = transform * Transform::Scale(2.0, 1.5, 0.0);

  TransformOrigin transformOrigin = createTransformOriginPercent(50, 50);

  auto result =
      BaseViewProps::resolveTransform(frameSize, transform, transformOrigin);

  EXPECT_EQ(result.matrix, transform.matrix);
}

TEST_F(ResolveTransformTest, VariousTransformOriginPositions) {
  Size frameSize{.width = 100, .height = 200};
  Transform transform = Transform::Scale(2.0, 2.0, 0.);

  // Test origin at top-left (0, 0)
  TransformOrigin topLeft = createTransformOriginPoints(0, 0);
  auto resultTopLeft =
      BaseViewProps::resolveTransform(frameSize, transform, topLeft);
  auto expected = Transform::Translate(50.0, 100.0, 0.0) * transform;
  EXPECT_EQ(resultTopLeft.matrix, expected.matrix);

  // Test origin at center (50%, 50%)
  TransformOrigin center = createTransformOriginPercent(50, 50);
  auto resultCenter =
      BaseViewProps::resolveTransform(frameSize, transform, center);
  EXPECT_EQ(resultCenter.matrix, transform.matrix);

  // Test origin at bottom-right (100%, 100%)
  TransformOrigin bottomRight = createTransformOriginPercent(100, 100);
  auto resultBottomRight =
      BaseViewProps::resolveTransform(frameSize, transform, bottomRight);
  expected = Transform::Translate(-50.0, -100.0, 0.0) * transform;
  EXPECT_EQ(resultBottomRight.matrix, expected.matrix);
}

// Test with z-component in transform origin
TEST_F(ResolveTransformTest, TransformOriginWithZComponent) {
  Size frameSize{.width = 100, .height = 200};
  Transform transform = Transform::Scale(1.5, 1.5, 0.);

  TransformOrigin transformOrigin;
  transformOrigin.xy[0] = ValueUnit(50, UnitType::Point);
  transformOrigin.xy[1] = ValueUnit(100, UnitType::Point);
  transformOrigin.z = 10.0f;

  auto result =
      BaseViewProps::resolveTransform(frameSize, transform, transformOrigin);
  auto expected = Transform::Translate(0.0, 0.0, 10.0) * transform;
  EXPECT_EQ(result.matrix, expected.matrix);
}

TEST_F(ResolveTransformTest, ArbitraryTransformMatrix) {
  Size frameSize{.width = 100, .height = 200};

  Transform transform;
  transform.operations.push_back({
      .type = TransformOperationType::Arbitrary,
      .x = ValueUnit(0, UnitType::Point),
      .y = ValueUnit(0, UnitType::Point),
      .z = ValueUnit(0, UnitType::Point),
  });
  // Set custom matrix
  transform.matrix = {{2, 0, 0, 0, 0, 2, 0, 0, 0, 0, 1, 0, 10, 20, 0, 1}};

  TransformOrigin transformOrigin = createTransformOriginPoints(25, 50);

  auto result =
      BaseViewProps::resolveTransform(frameSize, transform, transformOrigin);

  auto expected = Transform::Translate(25.0, 50.0, 0.0) * transform;
  EXPECT_EQ(result.matrix, expected.matrix);
}

// Test rotation with empty frame size and no transform origin
TEST_F(ResolveTransformTest, RotationEmptyFrameNoTransformOrigin) {
  Size frameSize{.width = 0, .height = 0};
  Transform transform = Transform::RotateZ(M_PI / 4.0); // 45 degrees
  TransformOrigin transformOrigin; // Default (not set)

  auto result =
      BaseViewProps::resolveTransform(frameSize, transform, transformOrigin);

  // With empty frame size and no transform origin, should just apply the
  // rotation directly
  expectTransformsEqual(result, transform);
}

// Test rotation with empty frame size and transform origin in points
TEST_F(ResolveTransformTest, RotationEmptyFrameTransformOriginPoints) {
  Size frameSize{.width = 0, .height = 0};
  Transform transform = Transform::RotateZ(M_PI / 4.0); // 45 degrees
  TransformOrigin transformOrigin = createTransformOriginPoints(10, 20);

  auto result =
      BaseViewProps::resolveTransform(frameSize, transform, transformOrigin);

  // With empty frame size, center is (0, 0), so origin offset is (10, 20)
  auto expected = Transform::Translate(10.0, 20.0, 0.0) * transform *
      Transform::Translate(-10.0, -20.0, 0.0);
  expectTransformsEqual(result, expected);
}

// Test rotation with empty frame size and transform origin in percentages
TEST_F(ResolveTransformTest, RotationEmptyFrameTransformOriginPercent) {
  Size frameSize{.width = 0, .height = 0};
  Transform transform = Transform::RotateZ(M_PI / 6.0); // 30 degrees
  TransformOrigin transformOrigin = createTransformOriginPercent(50, 50);

  auto result =
      BaseViewProps::resolveTransform(frameSize, transform, transformOrigin);

  // With 0 frame size, percentages resolve to 0, so no origin offset
  expectTransformsEqual(result, transform);
}

// Test rotation with non-empty frame size and no transform origin
TEST_F(ResolveTransformTest, RotationNonEmptyFrameNoTransformOrigin) {
  Size frameSize{.width = 100, .height = 200};
  Transform transform = Transform::RotateZ(M_PI / 3.0); // 60 degrees
  TransformOrigin transformOrigin; // Default (not set)

  auto result =
      BaseViewProps::resolveTransform(frameSize, transform, transformOrigin);

  // Without transform origin, rotation should happen around default center
  expectTransformsEqual(result, transform);
}

// Test rotation with non-empty frame size and transform origin in points
TEST_F(ResolveTransformTest, RotationNonEmptyFrameTransformOriginPoints) {
  Size frameSize{.width = 100, .height = 200};
  Transform transform = Transform::RotateZ(M_PI / 4.0); // 45 degrees
  TransformOrigin transformOrigin = createTransformOriginPoints(25, 50);

  auto result =
      BaseViewProps::resolveTransform(frameSize, transform, transformOrigin);

  // Center of 100x200 frame is (50, 100), origin at (25, 50) means offset of
  // (-25, -50)
  auto expected = Transform::Translate(-25.0, -50.0, 0.0) * transform *
      Transform::Translate(25.0, 50.0, 0.0);
  expectTransformsEqual(result, expected);
}

// Test rotation with non-empty frame size and transform origin in percentages
TEST_F(ResolveTransformTest, RotationNonEmptyFrameTransformOriginPercent) {
  Size frameSize{.width = 100, .height = 200};
  Transform transform = Transform::RotateZ(M_PI / 2.0); // 90 degrees
  TransformOrigin transformOrigin =
      createTransformOriginPercent(25, 75); // 25% width, 75% height

  auto result =
      BaseViewProps::resolveTransform(frameSize, transform, transformOrigin);

  // Should resolve percentages: 25% of 100 = 25, 75% of 200 = 150
  // Center is (50, 100), so origin offset is (25-50, 150-100) = (-25, 50)
  auto expected = Transform::Translate(-25.0, 50.0, 0.0) * transform *
      Transform::Translate(25.0, -50.0, 0.0);
  expectTransformsEqual(result, expected);
}

// Test rotation with mixed transform origin units
TEST_F(ResolveTransformTest, RotationMixedTransformOriginUnits) {
  Size frameSize{.width = 100, .height = 200};
  Transform transform = Transform::RotateZ(M_PI); // 180 degrees

  TransformOrigin transformOrigin;
  transformOrigin.xy[0] = ValueUnit(30, UnitType::Point); // 30 points
  transformOrigin.xy[1] = ValueUnit(25, UnitType::Percent); // 25% of 200 = 50
  transformOrigin.z = 0;

  auto result =
      BaseViewProps::resolveTransform(frameSize, transform, transformOrigin);

  // Center is (50, 100), origin is (30, 50), so offset is (-20, -50)
  auto expected = Transform::Translate(-20.0, -50.0, 0.0) * transform *
      Transform::Translate(20.0, 50.0, 0.0);
  expectTransformsEqual(result, expected);
}

// Test multiple rotations (RotateX, RotateY, RotateZ)
TEST_F(ResolveTransformTest, MultipleRotationsWithTransformOrigin) {
  Size frameSize{.width = 100, .height = 100};

  Transform transform = Transform::Rotate(M_PI / 6.0, M_PI / 4.0, M_PI / 3.0);
  TransformOrigin transformOrigin = createTransformOriginPercent(50, 50);

  auto result =
      BaseViewProps::resolveTransform(frameSize, transform, transformOrigin);
  expectTransformsEqual(result, transform);
}

// Test rotation with z-component in transform origin
TEST_F(ResolveTransformTest, RotationWithZTransformOrigin) {
  Size frameSize{.width = 100, .height = 200};
  Transform transform = Transform::RotateZ(M_PI / 4.0); // 45 degrees

  TransformOrigin transformOrigin;
  transformOrigin.xy[0] = ValueUnit(50, UnitType::Point);
  transformOrigin.xy[1] = ValueUnit(100, UnitType::Point);
  transformOrigin.z = 15.0f;

  auto result =
      BaseViewProps::resolveTransform(frameSize, transform, transformOrigin);

  // Center is (50, 100), origin is (50, 100, 15), so offset is (0, 0, 15)
  auto expected = Transform::Translate(0.0, 0.0, 15.0) * transform *
      Transform::Translate(0.0, 0.0, -15.0);
  expectTransformsEqual(result, expected);
}

// Test rotation at different origin positions (corners vs center)
TEST_F(ResolveTransformTest, RotationDifferentOriginPositions) {
  Size frameSize{.width = 100, .height = 100};
  Transform transform = Transform::RotateZ(M_PI / 2.0); // 90 degrees

  // Test rotation around top-left corner (0, 0)
  TransformOrigin topLeft = createTransformOriginPoints(0, 0);
  auto resultTopLeft =
      BaseViewProps::resolveTransform(frameSize, transform, topLeft);
  auto expectedTopLeft = Transform::Translate(-50.0, -50.0, 0.0) * transform *
      Transform::Translate(50.0, 50.0, 0.0);
  expectTransformsEqual(resultTopLeft, expectedTopLeft);

  // Test rotation around center (50%, 50%)
  TransformOrigin center = createTransformOriginPercent(50, 50);
  auto resultCenter =
      BaseViewProps::resolveTransform(frameSize, transform, center);
  expectTransformsEqual(resultCenter, transform);

  // Test rotation around bottom-right corner (100%, 100%)
  TransformOrigin bottomRight = createTransformOriginPercent(100, 100);
  auto resultBottomRight =
      BaseViewProps::resolveTransform(frameSize, transform, bottomRight);
  auto expectedBottomRight = Transform::Translate(50.0, 50.0, 0.0) * transform *
      Transform::Translate(-50.0, -50.0, 0.0);
  expectTransformsEqual(resultBottomRight, expectedBottomRight);
}

} // namespace facebook::react