/**
 * Copyright (c) 2015-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

#pragma once

#include <cmath>

namespace facebook {
namespace react {

struct Transform {
  std::array<Float, 16> matrix {{
    1, 0, 0, 0,
    0, 1, 0, 0,
    0, 0, 1, 0,
    0, 0, 0, 1
  }};

  static Transform Identity() {
    Transform transform;
    return transform;
  }

  static Transform Perspective(const Float &perspective) {
    Transform transform;
    transform.matrix[11] = -1.0 / perspective;
    return transform;
  }

  static Transform Scale(const Float &factorX, const Float &factorY, const Float &factorZ) {
    Transform transform;
    transform.matrix[0] = factorX;
    transform.matrix[5] = factorY;
    transform.matrix[10] = factorZ;
    return transform;
  }

  static Transform Translate(const Float &x, const Float &y, const Float &z) {
    Transform transform;
    transform.matrix[12] = x;
    transform.matrix[13] = y;
    transform.matrix[14] = z;
    return transform;
  }

  static Transform Skew(const Float &x, const Float &y) {
    Transform transform;
    transform.matrix[4] = std::tan(x);
    transform.matrix[1] = std::tan(y);
    return transform;
  }

  static Transform RotateX(const Float &radians) {
    Transform transform;
    transform.matrix[5] = std::cos(radians);
    transform.matrix[6] = std::sin(radians);
    transform.matrix[9] = -std::sin(radians);
    transform.matrix[10] = std::cos(radians);
    return transform;
  }

  static Transform RotateY(const Float &radians) {
    Transform transform;
    transform.matrix[0] = std::cos(radians);
    transform.matrix[2] = -std::sin(radians);
    transform.matrix[8] = std::sin(radians);
    transform.matrix[10] = std::cos(radians);
    return transform;
  }

  static Transform RotateZ(const Float &radians) {
    Transform transform;
    transform.matrix[0] = std::cos(radians);
    transform.matrix[1] = std::sin(radians);
    transform.matrix[4] = -std::sin(radians);
    transform.matrix[5] = std::cos(radians);
    return transform;
  }

  static Transform Rotate(const Float &x, const Float &y, const Float &z) {
    Transform transform;
    if (x != 0) { transform = transform * Transform::RotateX(x); }
    if (y != 0) { transform = transform * Transform::RotateY(y); }
    if (z != 0) { transform = transform * Transform::RotateZ(z); }
    return transform;
  }

  bool operator ==(const Transform& rhs) const {
    for (int i = 0; i < 16; i++) {
      if (matrix[i] != rhs.matrix[i]) {
        return false;
      }
    }
    return true;
  }

  bool operator !=(const Transform& rhs) const {
    return !(*this == rhs);
  }

  Transform operator *(const Transform& rhs) const {
    if (*this == Transform::Identity()) {
      return rhs;
    }

    const Transform &lhs = *this;
    Transform result;

    Float lhs00 = lhs.matrix[0], lhs01 = lhs.matrix[1], lhs02 = lhs.matrix[2], lhs03 = lhs.matrix[3],
    lhs10 = lhs.matrix[4], lhs11 = lhs.matrix[5], lhs12 = lhs.matrix[6], lhs13 = lhs.matrix[7],
    lhs20 = lhs.matrix[8], lhs21 = lhs.matrix[9], lhs22 = lhs.matrix[10], lhs23 = lhs.matrix[11],
    lhs30 = lhs.matrix[12], lhs31 = lhs.matrix[13], lhs32 = lhs.matrix[14], lhs33 = lhs.matrix[15];

    Float rhs0 = rhs.matrix[0], rhs1 = rhs.matrix[1], rhs2 = rhs.matrix[2], rhs3 = rhs.matrix[3];
    result.matrix[0] = rhs0 * lhs00 + rhs1 * lhs10 + rhs2 * lhs20 + rhs3 * lhs30;
    result.matrix[1] = rhs0 * lhs01 + rhs1 * lhs11 + rhs2 * lhs21 + rhs3 * lhs31;
    result.matrix[2] = rhs0 * lhs02 + rhs1 * lhs12 + rhs2 * lhs22 + rhs3 * lhs32;
    result.matrix[3] = rhs0 * lhs03 + rhs1 * lhs13 + rhs2 * lhs23 + rhs3 * lhs33;

    rhs0 = rhs.matrix[4]; rhs1 = rhs.matrix[5]; rhs2 = rhs.matrix[6]; rhs3 = rhs.matrix[7];
    result.matrix[4] = rhs0 * lhs00 + rhs1 * lhs10 + rhs2 * lhs20 + rhs3 * lhs30;
    result.matrix[5] = rhs0 * lhs01 + rhs1 * lhs11 + rhs2 * lhs21 + rhs3 * lhs31;
    result.matrix[6] = rhs0 * lhs02 + rhs1 * lhs12 + rhs2 * lhs22 + rhs3 * lhs32;
    result.matrix[7] = rhs0 * lhs03 + rhs1 * lhs13 + rhs2 * lhs23 + rhs3 * lhs33;

    rhs0 = rhs.matrix[8]; rhs1 = rhs.matrix[9]; rhs2 = rhs.matrix[10]; rhs3 = rhs.matrix[11];
    result.matrix[8] = rhs0 * lhs00 + rhs1 * lhs10 + rhs2 * lhs20 + rhs3 * lhs30;
    result.matrix[9] = rhs0 * lhs01 + rhs1 * lhs11 + rhs2 * lhs21 + rhs3 * lhs31;
    result.matrix[10] = rhs0 * lhs02 + rhs1 * lhs12 + rhs2 * lhs22 + rhs3 * lhs32;
    result.matrix[11] = rhs0 * lhs03 + rhs1 * lhs13 + rhs2 * lhs23 + rhs3 * lhs33;

    rhs0 = rhs.matrix[12]; rhs1 = rhs.matrix[13]; rhs2 = rhs.matrix[14]; rhs3 = rhs.matrix[15];
    result.matrix[12] = rhs0 * lhs00 + rhs1 * lhs10 + rhs2 * lhs20 + rhs3 * lhs30;
    result.matrix[13] = rhs0 * lhs01 + rhs1 * lhs11 + rhs2 * lhs21 + rhs3 * lhs31;
    result.matrix[14] = rhs0 * lhs02 + rhs1 * lhs12 + rhs2 * lhs22 + rhs3 * lhs32;
    result.matrix[15] = rhs0 * lhs03 + rhs1 * lhs13 + rhs2 * lhs23 + rhs3 * lhs33;

    return result;
  }
};

enum class PointerEventsMode {
  Auto,
  None,
  BoxNone,
  BoxOnly
};

enum class BorderStyle {
  Solid,
  Dotted,
  Dashed
};

} // namespace react
} // namespace facebook