PropertyView.h

#pragma once
 
#include <CesiumGltf/ClassProperty.h>
#include <CesiumGltf/Enum.h>
#include <CesiumGltf/PropertyArrayView.h>
#include <CesiumGltf/PropertyAttributeProperty.h>
#include <CesiumGltf/PropertyTableProperty.h>
#include <CesiumGltf/PropertyTextureProperty.h>
#include <CesiumGltf/PropertyType.h>
#include <CesiumGltf/PropertyTypeTraits.h>
 
#include <algorithm>
#include <cstddef>
#include <cstring>
#include <optional>
 
namespace CesiumGltf {

typedef int32_t PropertyViewStatusType;

class PropertyViewStatus {
public:
  static const PropertyViewStatusType Valid = 0;

  static const PropertyViewStatusType EmptyPropertyWithDefault = 1;

  static const PropertyViewStatusType ErrorNonexistentProperty = 2;

  static const PropertyViewStatusType ErrorTypeMismatch = 3;

  static const PropertyViewStatusType ErrorComponentTypeMismatch = 4;

  static const PropertyViewStatusType ErrorArrayTypeMismatch = 5;

  static const PropertyViewStatusType ErrorInvalidNormalization = 6;

  static const PropertyViewStatusType ErrorNormalizationMismatch = 7;

  static const PropertyViewStatusType ErrorInvalidOffset = 8;

  static const PropertyViewStatusType ErrorInvalidScale = 9;

  static const PropertyViewStatusType ErrorInvalidMax = 10;

  static const PropertyViewStatusType ErrorInvalidMin = 11;

  static const PropertyViewStatusType ErrorInvalidNoDataValue = 12;

  static const PropertyViewStatusType ErrorInvalidDefaultValue = 13;

  static const PropertyViewStatusType ErrorInvalidEnum = 14;
};

template <typename T>
PropertyViewStatusType validatePropertyType(
    const ClassProperty& classProperty,
    const CesiumGltf::Enum* pEnumDefinition = nullptr) {
 
  if (!canRepresentPropertyType<T>(
          convertStringToPropertyType(classProperty.type))) {
    return PropertyViewStatus::ErrorTypeMismatch;
  }
 
  const bool isEnum = classProperty.type == ClassProperty::Type::ENUM;
  const bool hasEnumDefinition = pEnumDefinition != nullptr;
  if (isEnum != hasEnumDefinition) {
    return PropertyViewStatus::ErrorInvalidEnum;
  }
 
  PropertyComponentType expectedComponentType =
      TypeToPropertyType<T>::component;
  if (isEnum) {
    if (expectedComponentType !=
        convertStringToPropertyComponentType(pEnumDefinition->valueType)) {
      return PropertyViewStatus::ErrorComponentTypeMismatch;
    }
  } else {
    if (!classProperty.componentType &&
        expectedComponentType != PropertyComponentType::None) {
      return PropertyViewStatus::ErrorComponentTypeMismatch;
    }
 
    if (classProperty.componentType &&
        expectedComponentType != convertStringToPropertyComponentType(
                                     *classProperty.componentType)) {
      return PropertyViewStatus::ErrorComponentTypeMismatch;
    }
  }
 
  if (classProperty.array) {
    return PropertyViewStatus::ErrorArrayTypeMismatch;
  }
 
  return PropertyViewStatus::Valid;
}

template <typename T>
PropertyViewStatusType validateArrayPropertyType(
    const ClassProperty& classProperty,
    const CesiumGltf::Enum* pEnumDefinition = nullptr) {
  using ElementType = typename MetadataArrayType<T>::type;
 
  if (!canRepresentPropertyType<ElementType>(
          convertStringToPropertyType(classProperty.type))) {
    return PropertyViewStatus::ErrorTypeMismatch;
  }
 
  const bool isEnum = classProperty.type == ClassProperty::Type::ENUM;
  const bool hasEnumDefinition = pEnumDefinition != nullptr;
  if (isEnum != hasEnumDefinition) {
    return PropertyViewStatus::ErrorInvalidEnum;
  }
 
  PropertyComponentType expectedComponentType =
      TypeToPropertyType<ElementType>::component;
  if (isEnum) {
    if (expectedComponentType !=
        convertStringToPropertyComponentType(pEnumDefinition->valueType)) {
      return PropertyViewStatus::ErrorComponentTypeMismatch;
    }
  } else {
    if (!classProperty.componentType &&
        expectedComponentType != PropertyComponentType::None) {
      return PropertyViewStatus::ErrorComponentTypeMismatch;
    }
 
    if (classProperty.componentType &&
        expectedComponentType != convertStringToPropertyComponentType(
                                     *classProperty.componentType)) {
      return PropertyViewStatus::ErrorComponentTypeMismatch;
    }
  }
 
  if (!classProperty.array) {
    return PropertyViewStatus::ErrorArrayTypeMismatch;
  }
 
  return PropertyViewStatus::Valid;
}

template <typename T>
static std::optional<T> getScalar(const CesiumUtility::JsonValue& jsonValue) {
  return jsonValue.getSafeNumber<T>();
}

template <typename VecType>
static std::optional<VecType>
getVecN(const CesiumUtility::JsonValue& jsonValue) {
  if (!jsonValue.isArray()) {
    return std::nullopt;
  }
 
  const CesiumUtility::JsonValue::Array& array = jsonValue.getArray();
  constexpr glm::length_t N = VecType::length();
  if (array.size() != N) {
    return std::nullopt;
  }
 
  using T = typename VecType::value_type;
 
  VecType result;
  for (glm::length_t i = 0; i < N; i++) {
    std::optional<T> value = getScalar<T>(array[static_cast<size_t>(i)]);
    if (!value) {
      return std::nullopt;
    }
 
    result[i] = *value;
  }
 
  return result;
}

template <typename MatType>
static std::optional<MatType>
getMatN(const CesiumUtility::JsonValue& jsonValue) {
  if (!jsonValue.isArray()) {
    return std::nullopt;
  }
 
  const CesiumUtility::JsonValue::Array& array = jsonValue.getArray();
  constexpr glm::length_t N = MatType::length();
  if (array.size() != static_cast<size_t>(N * N)) {
    return std::nullopt;
  }
 
  using T = typename MatType::value_type;
 
  MatType result;
  for (glm::length_t i = 0; i < N; i++) {
    // Try to parse each value in the column.
    for (glm::length_t j = 0; j < N; j++) {
      std::optional<T> value =
          getScalar<T>(array[static_cast<size_t>(i * N + j)]);
      if (!value) {
        return std::nullopt;
      }
 
      result[i][j] = *value;
    }
  }
 
  return result;
}

template <typename ElementType>
int64_t getCount(std::optional<std::vector<std::byte>>& buffer) {
  if (!buffer) {
    return 0;
  }
 
  return static_cast<int64_t>(buffer->size() / sizeof(ElementType));
}

template <typename ElementType, bool Normalized = false> class PropertyView;

template <typename ElementType> class PropertyView<ElementType, false> {
public:
  PropertyView()
      : _status(PropertyViewStatus::ErrorNonexistentProperty),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _offset(std::nullopt),
        _scale(std::nullopt),
        _max(std::nullopt),
        _min(std::nullopt),
        _required(false),
        _noData(std::nullopt),
        _defaultValue(std::nullopt),
        _propertyType(PropertyType::Invalid) {}

  PropertyView(const ClassProperty& classProperty)
      : PropertyView(classProperty, nullptr) {}

  PropertyView(
      const ClassProperty& classProperty,
      const CesiumGltf::Enum* pEnumDefinition)
      : _status(
            validatePropertyType<ElementType>(classProperty, pEnumDefinition)),
        _name(classProperty.name),
        _semantic(classProperty.semantic),
        _description(classProperty.description),
        _offset(std::nullopt),
        _scale(std::nullopt),
        _max(std::nullopt),
        _min(std::nullopt),
        _required(classProperty.required),
        _noData(std::nullopt),
        _defaultValue(std::nullopt),
        _propertyType(convertStringToPropertyType(classProperty.type)) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.normalized) {
      _status = PropertyViewStatus::ErrorNormalizationMismatch;
      return;
    }
 
    if (classProperty.type != ClassProperty::Type::ENUM) {
      getNumericPropertyValues(classProperty);
    }
 
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.noData) {
      if (!_required && _propertyType == PropertyType::Enum) {
        CESIUM_ASSERT(pEnumDefinition != nullptr);
        if constexpr (IsMetadataInteger<ElementType>::value) {
          // "noData" can only be defined if the property is not required.
          _noData = getEnumValue(*classProperty.noData, *pEnumDefinition);
        }
      } else if (!_required && _propertyType != PropertyType::Enum) {
        _noData = getValue(*classProperty.noData);
      }
 
      if (!_noData) {
        // The value was specified but something went wrong.
        _status = PropertyViewStatus::ErrorInvalidNoDataValue;
        return;
      }
    }
 
    if (classProperty.defaultProperty) {
      if (!_required && _propertyType == PropertyType::Enum) {
        CESIUM_ASSERT(pEnumDefinition != nullptr);
        if constexpr (IsMetadataInteger<ElementType>::value) {
          // "default" can only be defined if the property is not required.
          _defaultValue =
              getEnumValue(*classProperty.defaultProperty, *pEnumDefinition);
        }
      } else if (!_required && _propertyType != PropertyType::Enum) {
        _defaultValue = getValue(*classProperty.defaultProperty);
      }
 
      if (!_defaultValue) {
        // The value was specified but something went wrong.
        _status = PropertyViewStatus::ErrorInvalidDefaultValue;
        return;
      }
    }
  }
 
protected:
  PropertyView(PropertyViewStatusType status)
      : _status(status),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _offset(std::nullopt),
        _scale(std::nullopt),
        _max(std::nullopt),
        _min(std::nullopt),
        _required(false),
        _noData(std::nullopt),
        _defaultValue(std::nullopt),
        _propertyType(PropertyType::Invalid) {}

  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTableProperty& property,
      const CesiumGltf::Enum* pEnumDefinition = nullptr)
      : PropertyView(classProperty, pEnumDefinition) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    // If the property has its own values, override the class-provided values.
    if (classProperty.type != ClassProperty::Type::ENUM) {
      getNumericPropertyValues(property);
    }
  }

  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTextureProperty& property,
      const CesiumGltf::Enum* pEnumDefinition = nullptr)
      : PropertyView(classProperty, pEnumDefinition) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.type != ClassProperty::Type::ENUM) {
      getNumericPropertyValues(property);
    }
  }

  PropertyView(
      const ClassProperty& classProperty,
      const PropertyAttributeProperty& property,
      const CesiumGltf::Enum* pEnumDefinition = nullptr)
      : PropertyView(classProperty, pEnumDefinition) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    // If the property has its own values, override the class-provided values.
    if (classProperty.type != ClassProperty::Type::ENUM) {
      getNumericPropertyValues(property);
    }
  }
 
public:
  PropertyViewStatusType status() const noexcept { return _status; }

  const std::optional<std::string>& name() const noexcept { return _name; }

  const std::optional<std::string>& semantic() const noexcept {
    return _semantic;
  }

  const std::optional<std::string>& description() const noexcept {
    return _description;
  }

  int64_t arrayCount() const noexcept { return 0; }

  bool normalized() const noexcept { return false; }

  std::optional<ElementType> offset() const noexcept { return _offset; }

  std::optional<ElementType> scale() const noexcept { return _scale; }

  std::optional<ElementType> max() const noexcept { return _max; }

  std::optional<ElementType> min() const noexcept { return _min; }

  bool required() const noexcept { return _required; }

  std::optional<ElementType> noData() const noexcept { return _noData; }

  std::optional<ElementType> defaultValue() const noexcept {
    return _defaultValue;
  }

  PropertyType propertyType() const noexcept { return _propertyType; }
 
protected:
  PropertyViewStatusType _status;
 
private:
  std::optional<std::string> _name;
  std::optional<std::string> _semantic;
  std::optional<std::string> _description;
 
  std::optional<ElementType> _offset;
  std::optional<ElementType> _scale;
  std::optional<ElementType> _max;
  std::optional<ElementType> _min;
 
  bool _required;
  std::optional<ElementType> _noData;
  std::optional<ElementType> _defaultValue;
  PropertyType _propertyType;

  static std::optional<ElementType>
  getValue(const CesiumUtility::JsonValue& jsonValue) {
    if constexpr (IsMetadataScalar<ElementType>::value) {
      return getScalar<ElementType>(jsonValue);
    }
 
    if constexpr (IsMetadataVecN<ElementType>::value) {
      return getVecN<ElementType>(jsonValue);
    }
 
    if constexpr (IsMetadataMatN<ElementType>::value) {
      return getMatN<ElementType>(jsonValue);
    }
  }
 
  static std::optional<ElementType> getEnumValue(
      const CesiumUtility::JsonValue& value,
      const CesiumGltf::Enum& enumDefinition) {
    if (!value.isString()) {
      return std::nullopt;
    }
 
    const CesiumUtility::JsonValue::String& valueStr = value.getString();
    const auto foundValue = std::find_if(
        enumDefinition.values.begin(),
        enumDefinition.values.end(),
        [&valueStr](const CesiumGltf::EnumValue& enumValue) {
          return enumValue.name == valueStr;
        });
 
    if (foundValue == enumDefinition.values.end()) {
      return std::nullopt;
    }
 
    return static_cast<ElementType>(foundValue->value);
  }
 
  using PropertyDefinitionType = std::variant<
      ClassProperty,
      PropertyTableProperty,
      PropertyTextureProperty,
      PropertyAttributeProperty>;

  void getNumericPropertyValues(const PropertyDefinitionType& inProperty) {
    std::visit(
        [this](auto property) {
          if (property.offset) {
            // Only floating point types can specify an offset.
            switch (TypeToPropertyType<ElementType>::component) {
            case PropertyComponentType::Float32:
            case PropertyComponentType::Float64:
              this->_offset = getValue(*property.offset);
              if (this->_offset) {
                break;
              }
              // If it does not break here, something went wrong.
              [[fallthrough]];
            default:
              this->_status = PropertyViewStatus::ErrorInvalidOffset;
              return;
            }
          }
 
          if (property.scale) {
            // Only floating point types can specify a scale.
            switch (TypeToPropertyType<ElementType>::component) {
            case PropertyComponentType::Float32:
            case PropertyComponentType::Float64:
              this->_scale = getValue(*property.scale);
              if (this->_scale) {
                break;
              }
              // If it does not break here, something went wrong.
              [[fallthrough]];
            default:
              this->_status = PropertyViewStatus::ErrorInvalidScale;
              return;
            }
          }
 
          if (property.max) {
            this->_max = getValue(*property.max);
            if (!this->_max) {
              // The value was specified but something went wrong.
              this->_status = PropertyViewStatus::ErrorInvalidMax;
              return;
            }
          }
 
          if (property.min) {
            this->_min = getValue(*property.min);
            if (!this->_min) {
              // The value was specified but something went wrong.
              this->_status = PropertyViewStatus::ErrorInvalidMin;
              return;
            }
          }
        },
        inProperty);
  }
};

template <typename ElementType> class PropertyView<ElementType, true> {
private:
  using NormalizedType = typename TypeToNormalizedType<ElementType>::type;
 
public:
  PropertyView()
      : _status(PropertyViewStatus::ErrorNonexistentProperty),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _offset(std::nullopt),
        _scale(std::nullopt),
        _max(std::nullopt),
        _min(std::nullopt),
        _required(false),
        _noData(std::nullopt),
        _defaultValue(std::nullopt),
        _propertyType(PropertyType::Invalid) {}

  PropertyView(const ClassProperty& classProperty)
      : _status(validatePropertyType<ElementType>(classProperty)),
        _name(classProperty.name),
        _semantic(classProperty.semantic),
        _description(classProperty.description),
        _offset(std::nullopt),
        _scale(std::nullopt),
        _max(std::nullopt),
        _min(std::nullopt),
        _required(classProperty.required),
        _noData(std::nullopt),
        _defaultValue(std::nullopt),
        _propertyType(convertStringToPropertyType(classProperty.type)) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (!classProperty.normalized) {
      _status = PropertyViewStatus::ErrorNormalizationMismatch;
    }
 
    getNumericPropertyValues(classProperty);
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.noData) {
      if (!_required) {
        // "noData" should not be defined if the property is required.
        _noData = getValue<ElementType>(*classProperty.noData);
      }
      if (!_noData) {
        // The value was specified but something went wrong.
        _status = PropertyViewStatus::ErrorInvalidNoDataValue;
        return;
      }
    }
 
    if (classProperty.defaultProperty) {
      // default value should not be defined if the property is required.
      if (!_required) {
        _defaultValue =
            getValue<NormalizedType>(*classProperty.defaultProperty);
      }
      if (!_defaultValue) {
        // The value was specified but something went wrong.
        _status = PropertyViewStatus::ErrorInvalidDefaultValue;
        return;
      }
    }
  }
 
protected:
  PropertyView(PropertyViewStatusType status)
      : _status(status),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _offset(std::nullopt),
        _scale(std::nullopt),
        _max(std::nullopt),
        _min(std::nullopt),
        _required(false),
        _noData(std::nullopt),
        _defaultValue(std::nullopt),
        _propertyType(PropertyType::Invalid) {}

  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTableProperty& property)
      : PropertyView(classProperty) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    // If the property has its own values, override the class-provided values.
    getNumericPropertyValues(property);
  }

  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTextureProperty& property)
      : PropertyView(classProperty) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    // If the property has its own values, override the class-provided values.
    getNumericPropertyValues(property);
  }

  PropertyView(
      const ClassProperty& classProperty,
      const PropertyAttributeProperty& property)
      : PropertyView(classProperty) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    // If the property has its own values, override the class-provided values.
    getNumericPropertyValues(property);
  }
 
public:
  PropertyViewStatusType status() const noexcept { return _status; }

  const std::optional<std::string>& name() const noexcept { return _name; }

  const std::optional<std::string>& semantic() const noexcept {
    return _semantic;
  }

  const std::optional<std::string>& description() const noexcept {
    return _description;
  }

  int64_t arrayCount() const noexcept { return 0; }

  bool normalized() const noexcept { return true; }

  std::optional<NormalizedType> offset() const noexcept { return _offset; }

  std::optional<NormalizedType> scale() const noexcept { return _scale; }

  std::optional<NormalizedType> max() const noexcept { return _max; }

  std::optional<NormalizedType> min() const noexcept { return _min; }

  bool required() const noexcept { return _required; }

  std::optional<ElementType> noData() const noexcept { return _noData; }

  std::optional<NormalizedType> defaultValue() const noexcept {
    return _defaultValue;
  }

  PropertyType propertyType() const noexcept { return _propertyType; }
 
protected:
  PropertyViewStatusType _status;
 
private:
  std::optional<std::string> _name;
  std::optional<std::string> _semantic;
  std::optional<std::string> _description;
 
  std::optional<NormalizedType> _offset;
  std::optional<NormalizedType> _scale;
  std::optional<NormalizedType> _max;
  std::optional<NormalizedType> _min;
 
  bool _required;
  std::optional<ElementType> _noData;
  std::optional<NormalizedType> _defaultValue;
  PropertyType _propertyType;

  template <typename T>
  static std::optional<T> getValue(const CesiumUtility::JsonValue& jsonValue) {
    if constexpr (IsMetadataScalar<T>::value) {
      return getScalar<T>(jsonValue);
    }
 
    if constexpr (IsMetadataVecN<T>::value) {
      return getVecN<T>(jsonValue);
    }
 
    if constexpr (IsMetadataMatN<T>::value) {
      return getMatN<T>(jsonValue);
    }
  }
 
  using PropertyDefinitionType = std::variant<
      ClassProperty,
      PropertyTableProperty,
      PropertyTextureProperty,
      PropertyAttributeProperty>;

  void getNumericPropertyValues(const PropertyDefinitionType& inProperty) {
    std::visit(
        [this](auto property) {
          if (property.offset) {
            _offset = getValue<NormalizedType>(*property.offset);
            if (!_offset) {
              // The value was specified but something went wrong.
              _status = PropertyViewStatus::ErrorInvalidOffset;
              return;
            }
          }
 
          if (property.scale) {
            _scale = getValue<NormalizedType>(*property.scale);
            if (!_scale) {
              // The value was specified but something went wrong.
              _status = PropertyViewStatus::ErrorInvalidScale;
              return;
            }
          }
 
          if (property.max) {
            _max = getValue<NormalizedType>(*property.max);
            if (!_scale) {
              // The value was specified but something went wrong.
              _status = PropertyViewStatus::ErrorInvalidMax;
              return;
            }
          }
 
          if (property.min) {
            _min = getValue<NormalizedType>(*property.min);
            if (!_scale) {
              // The value was specified but something went wrong.
              _status = PropertyViewStatus::ErrorInvalidMin;
              return;
            }
          }
        },
        inProperty);
  }
};

template <> class PropertyView<bool> {
public:
  PropertyView()
      : _status(PropertyViewStatus::ErrorNonexistentProperty),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _required(false),
        _defaultValue(std::nullopt) {}

  PropertyView(const ClassProperty& classProperty)
      : _status(validatePropertyType<bool>(classProperty)),
        _name(classProperty.name),
        _semantic(classProperty.semantic),
        _description(classProperty.description),
        _required(classProperty.required),
        _defaultValue(std::nullopt) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.defaultProperty) {
      if (!_required) {
        _defaultValue = getBooleanValue(*classProperty.defaultProperty);
      }
 
      if (!_defaultValue) {
        // The value was specified but something went wrong.
        _status = PropertyViewStatus::ErrorInvalidDefaultValue;
        return;
      }
    }
  }
 
protected:
  PropertyView(PropertyViewStatusType status)
      : _status(status),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _required(false),
        _defaultValue(std::nullopt) {}

  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTableProperty& /*property*/,
      const CesiumGltf::Enum* /*pEnumDefinition*/)
      : PropertyView(classProperty) {}
 
public:
  PropertyViewStatusType status() const noexcept { return _status; }

  const std::optional<std::string>& name() const noexcept { return _name; }

  const std::optional<std::string>& semantic() const noexcept {
    return _semantic;
  }

  const std::optional<std::string>& description() const noexcept {
    return _description;
  }

  int64_t arrayCount() const noexcept { return 0; }

  bool normalized() const noexcept { return false; }

  std::optional<bool> offset() const noexcept { return std::nullopt; }

  std::optional<bool> scale() const noexcept { return std::nullopt; }

  std::optional<bool> max() const noexcept { return std::nullopt; }

  std::optional<bool> min() const noexcept { return std::nullopt; }

  bool required() const noexcept { return _required; }

  std::optional<bool> noData() const noexcept { return std::nullopt; }

  std::optional<bool> defaultValue() const noexcept { return _defaultValue; }

  PropertyType propertyType() const noexcept { return PropertyType::Boolean; }
 
protected:
  PropertyViewStatusType _status;
 
private:
  std::optional<std::string> _name;
  std::optional<std::string> _semantic;
  std::optional<std::string> _description;
 
  bool _required;
  std::optional<bool> _defaultValue;
 
  static std::optional<bool>
  getBooleanValue(const CesiumUtility::JsonValue& value) {
    if (!value.isBool()) {
      return std::nullopt;
    }
 
    return value.getBool();
  }
};

template <> class PropertyView<std::string_view> {
public:
  PropertyView()
      : _status(PropertyViewStatus::ErrorNonexistentProperty),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _required(false),
        _noData(std::nullopt),
        _defaultValue(std::nullopt) {}

  PropertyView(const ClassProperty& classProperty)
      : _status(validatePropertyType<std::string_view>(classProperty)),
        _name(classProperty.name),
        _semantic(classProperty.semantic),
        _description(classProperty.description),
        _required(classProperty.required),
        _noData(std::nullopt),
        _defaultValue(std::nullopt) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.noData) {
      if (!_required) {
        _noData = getStringValue(*classProperty.noData);
      }
 
      if (!_noData) {
        // The value was specified but something went wrong.
        _status = PropertyViewStatus::ErrorInvalidNoDataValue;
        return;
      }
    }
 
    if (classProperty.defaultProperty) {
      if (!_required) {
        _defaultValue = getStringValue(*classProperty.defaultProperty);
      }
 
      if (!_defaultValue) {
        // The value was specified but something went wrong.
        _status = PropertyViewStatus::ErrorInvalidDefaultValue;
        return;
      }
    }
  }
 
protected:
  PropertyView(PropertyViewStatusType status)
      : _status(status),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _required(false),
        _noData(std::nullopt),
        _defaultValue(std::nullopt) {}

  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTableProperty& /*property*/,
      const CesiumGltf::Enum* /*pEnumDefinition*/)
      : PropertyView(classProperty) {}
 
public:
  PropertyViewStatusType status() const noexcept { return _status; }

  const std::optional<std::string>& name() const noexcept { return _name; }

  const std::optional<std::string>& semantic() const noexcept {
    return _semantic;
  }

  const std::optional<std::string>& description() const noexcept {
    return _description;
  }

  int64_t arrayCount() const noexcept { return 0; }

  bool normalized() const noexcept { return false; }

  std::optional<std::string_view> offset() const noexcept {
    return std::nullopt;
  }

  std::optional<std::string_view> scale() const noexcept {
    return std::nullopt;
  }

  std::optional<std::string_view> max() const noexcept { return std::nullopt; }

  std::optional<std::string_view> min() const noexcept { return std::nullopt; }

  bool required() const noexcept { return _required; }

  std::optional<std::string_view> noData() const noexcept {
    if (_noData)
      return std::string_view(*_noData);
 
    return std::nullopt;
  }

  std::optional<std::string_view> defaultValue() const noexcept {
    if (_defaultValue)
      return std::string_view(*_defaultValue);
 
    return std::nullopt;
  }

  PropertyType propertyType() const noexcept { return PropertyType::String; }
 
protected:
  PropertyViewStatusType _status;
 
private:
  std::optional<std::string> _name;
  std::optional<std::string> _semantic;
  std::optional<std::string> _description;
 
  bool _required;
  std::optional<std::string> _noData;
  std::optional<std::string> _defaultValue;
 
  static std::optional<std::string>
  getStringValue(const CesiumUtility::JsonValue& value) {
    if (!value.isString()) {
      return std::nullopt;
    }
 
    return std::string(value.getString().c_str());
  }
};

template <typename ElementType>
class PropertyView<PropertyArrayView<ElementType>, false> {
public:
  PropertyView()
      : _status(PropertyViewStatus::ErrorNonexistentProperty),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _count(0),
        _offset(),
        _scale(),
        _max(),
        _min(),
        _required(false),
        _noData(),
        _defaultValue(),
        _propertyType(PropertyType::Invalid) {}

  PropertyView(const ClassProperty& classProperty)
      : PropertyView(classProperty, nullptr) {}

  PropertyView(
      const ClassProperty& classProperty,
      const CesiumGltf::Enum* pEnumDefinition)
      : _status(validateArrayPropertyType<PropertyArrayView<ElementType>>(
            classProperty,
            pEnumDefinition)),
        _name(classProperty.name),
        _semantic(classProperty.semantic),
        _description(classProperty.description),
        _count(classProperty.count ? *classProperty.count : 0),
        _offset(),
        _scale(),
        _max(),
        _min(),
        _required(classProperty.required),
        _noData(),
        _defaultValue(),
        _propertyType(convertStringToPropertyType(classProperty.type)) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.normalized) {
      _status = PropertyViewStatus::ErrorNormalizationMismatch;
      return;
    }
 
    if (classProperty.type != ClassProperty::Type::ENUM) {
      getNumericPropertyValues(classProperty);
    }
 
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.noData) {
      if (!this->_required && this->_propertyType == PropertyType::Enum) {
        CESIUM_ASSERT(pEnumDefinition != nullptr);
        if constexpr (IsMetadataInteger<ElementType>::value) {
          this->_noData =
              getEnumArrayValue(*classProperty.noData, *pEnumDefinition);
        }
      } else if (!this->_required) {
        this->_noData = getArrayValue(*classProperty.noData);
      }
 
      if (this->_noData.size() == 0) {
        // The value was specified but something went wrong.
        this->_status = PropertyViewStatus::ErrorInvalidNoDataValue;
        return;
      }
    }
 
    if (classProperty.defaultProperty) {
      if (!this->_required && this->_propertyType == PropertyType::Enum) {
        CESIUM_ASSERT(pEnumDefinition != nullptr);
        if constexpr (IsMetadataInteger<ElementType>::value) {
          this->_defaultValue = getEnumArrayValue(
              *classProperty.defaultProperty,
              *pEnumDefinition);
        }
      } else if (!this->_required) {
        this->_defaultValue = getArrayValue(*classProperty.defaultProperty);
      }
 
      if (this->_defaultValue.size() == 0) {
        // The value was specified but something went wrong.
        this->_status = PropertyViewStatus::ErrorInvalidDefaultValue;
        return;
      }
    }
  }
 
protected:
  PropertyView(PropertyViewStatusType status)
      : _status(status),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _count(0),
        _offset(),
        _scale(),
        _max(),
        _min(),
        _required(false),
        _noData(),
        _defaultValue(),
        _propertyType(PropertyType::Invalid) {}

  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTableProperty& property,
      const CesiumGltf::Enum* pEnumDefinition = nullptr)
      : PropertyView(classProperty, pEnumDefinition) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    // If the property has its own values, override the class-provided values.
    if (classProperty.type != ClassProperty::Type::ENUM) {
      getNumericPropertyValues(property);
    }
  }

  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTextureProperty& property,
      const CesiumGltf::Enum* pEnumDefinition = nullptr)
      : PropertyView(classProperty, pEnumDefinition) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    // If the property has its own values, override the class-provided values.
    if (classProperty.type != ClassProperty::Type::ENUM) {
      getNumericPropertyValues(property);
    }
  }
 
public:
  PropertyViewStatusType status() const noexcept { return _status; }

  const std::optional<std::string>& name() const noexcept { return _name; }

  const std::optional<std::string>& semantic() const noexcept {
    return _semantic;
  }

  const std::optional<std::string>& description() const noexcept {
    return _description;
  }

  int64_t arrayCount() const noexcept { return _count; }

  bool normalized() const noexcept { return false; }

  std::optional<PropertyArrayView<ElementType>> offset() const noexcept {
    return this->_offset.size() > 0 ? std::make_optional(this->_offset.view())
                                    : std::nullopt;
  }

  std::optional<PropertyArrayView<ElementType>> scale() const noexcept {
    return this->_scale.size() > 0 ? std::make_optional(this->_scale.view())
                                   : std::nullopt;
  }

  std::optional<PropertyArrayView<ElementType>> max() const noexcept {
    return this->_max.size() > 0 ? std::make_optional(this->_max.view())
                                 : std::nullopt;
  }

  std::optional<PropertyArrayView<ElementType>> min() const noexcept {
    return this->_min.size() > 0 ? std::make_optional(this->_min.view())
                                 : std::nullopt;
  }

  bool required() const noexcept { return _required; }

  std::optional<PropertyArrayView<ElementType>> noData() const noexcept {
    return this->_noData.size() > 0 ? std::make_optional(this->_noData.view())
                                    : std::nullopt;
  }

  std::optional<PropertyArrayView<ElementType>> defaultValue() const noexcept {
    return this->_defaultValue.size() > 0
               ? std::make_optional(this->_defaultValue.view())
               : std::nullopt;
  }

  PropertyType propertyType() const noexcept { return _propertyType; }
 
protected:
  PropertyViewStatusType _status;
 
private:
  std::optional<std::string> _name;
  std::optional<std::string> _semantic;
  std::optional<std::string> _description;
 
  int64_t _count;
 
  PropertyArrayCopy<ElementType> _offset;
  PropertyArrayCopy<ElementType> _scale;
  PropertyArrayCopy<ElementType> _max;
  PropertyArrayCopy<ElementType> _min;
 
  bool _required;
  PropertyArrayCopy<ElementType> _noData;
  PropertyArrayCopy<ElementType> _defaultValue;
  PropertyType _propertyType;
 
  using PropertyDefinitionType = std::
      variant<ClassProperty, PropertyTableProperty, PropertyTextureProperty>;
  void getNumericPropertyValues(const PropertyDefinitionType& inProperty) {
    std::visit(
        [this](auto property) {
          bool isFixedSizeArray = this->_count > 0;
 
          if (property.offset) {
            // Only floating point types can specify an offset.
            switch (TypeToPropertyType<ElementType>::component) {
            case PropertyComponentType::Float32:
            case PropertyComponentType::Float64:
              if (isFixedSizeArray) {
                this->_offset = getArrayValue(*property.offset);
                if (this->_offset.size() == this->_count) {
                  break;
                }
              }
              // If it does not break here, something went wrong.
              [[fallthrough]];
            default:
              this->_status = PropertyViewStatus::ErrorInvalidOffset;
              return;
            }
          }
 
          if (property.scale) {
            // Only floating point types can specify a scale.
            switch (TypeToPropertyType<ElementType>::component) {
            case PropertyComponentType::Float32:
            case PropertyComponentType::Float64:
              if (isFixedSizeArray) {
                this->_scale = getArrayValue(*property.scale);
                if (this->_scale.size() == this->_count) {
                  break;
                }
              }
              // If it does not break here, something went wrong.
              [[fallthrough]];
            default:
              this->_status = PropertyViewStatus::ErrorInvalidScale;
              return;
            }
          }
 
          if (property.max) {
            if (isFixedSizeArray) {
              this->_max = getArrayValue(*property.max);
            }
            if (!isFixedSizeArray || this->_max.size() != this->_count) {
              // The value was specified but something went wrong.
              this->_status = PropertyViewStatus::ErrorInvalidMax;
              return;
            }
          }
 
          if (property.min) {
            if (isFixedSizeArray) {
              this->_min = getArrayValue(*property.min);
            }
            if (!isFixedSizeArray || this->_min.size() != this->_count) {
              // The value was specified but something went wrong.
              this->_status = PropertyViewStatus::ErrorInvalidMin;
              return;
            }
          }
        },
        inProperty);
  }
 
  static PropertyArrayCopy<ElementType>
  getArrayValue(const CesiumUtility::JsonValue& jsonValue) {
    if (!jsonValue.isArray()) {
      return PropertyArrayCopy<ElementType>();
    }
 
    const CesiumUtility::JsonValue::Array& array = jsonValue.getArray();
    std::vector<ElementType> values(array.size());
 
    if constexpr (IsMetadataScalar<ElementType>::value) {
      for (size_t i = 0; i < array.size(); i++) {
        std::optional<ElementType> maybeValue =
            getScalar<ElementType>(array[i]);
        if (!maybeValue.has_value()) {
          return PropertyArrayCopy<ElementType>();
        }
 
        values[i] = *maybeValue;
      }
    }
    if constexpr (IsMetadataVecN<ElementType>::value) {
      for (size_t i = 0; i < array.size(); i++) {
        std::optional<ElementType> maybeValue = getVecN<ElementType>(array[i]);
        if (!maybeValue.has_value()) {
          return PropertyArrayCopy<ElementType>();
        }
 
        values[i] = *maybeValue;
      }
    }
 
    if constexpr (IsMetadataMatN<ElementType>::value) {
      for (size_t i = 0; i < array.size(); i++) {
        std::optional<ElementType> maybeValue = getMatN<ElementType>(array[i]);
        if (!maybeValue.has_value()) {
          return PropertyArrayCopy<ElementType>();
        }
 
        values[i] = *maybeValue;
      }
    }
 
    return PropertyArrayCopy<ElementType>(values);
  }
 
  static PropertyArrayCopy<ElementType> getEnumArrayValue(
      const CesiumUtility::JsonValue& jsonValue,
      const CesiumGltf::Enum& enumDefinition) {
    if (!jsonValue.isArray()) {
      return PropertyArrayCopy<ElementType>();
    }
 
    const CesiumUtility::JsonValue::Array& array = jsonValue.getArray();
    std::vector<ElementType> values(array.size());
 
    for (size_t i = 0; i < array.size(); i++) {
      if (!array[i].isString()) {
        return PropertyArrayCopy<ElementType>();
      }
 
      // default and noData values for enums contain the name of the enum as a
      // string
      CesiumUtility::JsonValue::String str = array[i].getString();
      auto foundValue = std::find_if(
          enumDefinition.values.begin(),
          enumDefinition.values.end(),
          [&str](const CesiumGltf::EnumValue& enumValue) {
            return enumValue.name == str;
          });
 
      if (foundValue == enumDefinition.values.end()) {
        return PropertyArrayCopy<ElementType>();
      }
 
      values[i] = static_cast<ElementType>(foundValue->value);
    }
 
    return PropertyArrayCopy<ElementType>(values);
  }
};

template <typename ElementType>
class PropertyView<PropertyArrayView<ElementType>, true> {
private:
  using NormalizedType = typename TypeToNormalizedType<ElementType>::type;
 
public:
  PropertyView()
      : _status(PropertyViewStatus::ErrorNonexistentProperty),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _count(0),
        _offset(),
        _scale(),
        _max(),
        _min(),
        _required(false),
        _noData(),
        _defaultValue(),
        _propertyType(PropertyType::Invalid) {}

  PropertyView(const ClassProperty& classProperty)
      : _status(validateArrayPropertyType<PropertyArrayView<ElementType>>(
            classProperty)),
        _name(classProperty.name),
        _semantic(classProperty.semantic),
        _description(classProperty.description),
        _count(classProperty.count ? *classProperty.count : 0),
        _offset(),
        _scale(),
        _max(),
        _min(),
        _required(classProperty.required),
        _noData(),
        _defaultValue(),
        _propertyType(convertStringToPropertyType(classProperty.type)) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (!classProperty.normalized) {
      _status = PropertyViewStatus::ErrorNormalizationMismatch;
      return;
    }
 
    getNumericPropertyValues(classProperty);
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.noData) {
      if (!this->_required) {
        this->_noData = getArrayValue<ElementType>(*classProperty.noData);
      }
 
      if (this->_noData.size() == 0) {
        // The value was specified but something went wrong.
        this->_status = PropertyViewStatus::ErrorInvalidNoDataValue;
        return;
      }
    }
 
    if (classProperty.defaultProperty) {
      if (!this->_required) {
        this->_defaultValue =
            getArrayValue<NormalizedType>(*classProperty.defaultProperty);
      }
 
      if (this->_defaultValue.size() == 0) {
        // The value was specified but something went wrong.
        this->_status = PropertyViewStatus::ErrorInvalidDefaultValue;
        return;
      }
    }
  }
 
protected:
  PropertyView(PropertyViewStatusType status)
      : _status(status),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _count(0),
        _offset(),
        _scale(),
        _max(),
        _min(),
        _required(false),
        _noData(),
        _defaultValue(),
        _propertyType(PropertyType::Invalid) {}

  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTableProperty& property)
      : PropertyView(classProperty) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    // If the property has its own values, override the class-provided values.
    getNumericPropertyValues(property);
  }

  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTextureProperty& property)
      : PropertyView(classProperty) {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    // If the property has its own values, override the class-provided values.
    getNumericPropertyValues(property);
  }
 
public:
  PropertyViewStatusType status() const noexcept { return _status; }

  const std::optional<std::string>& name() const noexcept { return _name; }

  const std::optional<std::string>& semantic() const noexcept {
    return _semantic;
  }

  const std::optional<std::string>& description() const noexcept {
    return _description;
  }

  int64_t arrayCount() const noexcept { return _count; }

  bool normalized() const noexcept { return true; }

  std::optional<PropertyArrayView<NormalizedType>> offset() const noexcept {
    return this->_offset.size() > 0 ? std::make_optional(this->_offset.view())
                                    : std::nullopt;
  }

  std::optional<PropertyArrayView<NormalizedType>> scale() const noexcept {
    return this->_scale.size() > 0 ? std::make_optional(this->_scale.view())
                                   : std::nullopt;
  }

  std::optional<PropertyArrayView<NormalizedType>> max() const noexcept {
    return this->_max.size() > 0 ? std::make_optional(this->_max.view())
                                 : std::nullopt;
  }

  std::optional<PropertyArrayView<NormalizedType>> min() const noexcept {
    return this->_min.size() > 0 ? std::make_optional(this->_min.view())
                                 : std::nullopt;
  }

  bool required() const noexcept { return _required; }

  std::optional<PropertyArrayView<ElementType>> noData() const noexcept {
    return this->_noData.size() > 0 ? std::make_optional(this->_noData.view())
                                    : std::nullopt;
  }

  std::optional<PropertyArrayView<NormalizedType>>
  defaultValue() const noexcept {
    return this->_defaultValue.size() > 0
               ? std::make_optional(this->_defaultValue.view())
               : std::nullopt;
  }

  PropertyType propertyType() const noexcept { return _propertyType; }
 
protected:
  PropertyViewStatusType _status;
 
private:
  std::optional<std::string> _name;
  std::optional<std::string> _semantic;
  std::optional<std::string> _description;
 
  int64_t _count;
 
  PropertyArrayCopy<NormalizedType> _offset;
  PropertyArrayCopy<NormalizedType> _scale;
  PropertyArrayCopy<NormalizedType> _max;
  PropertyArrayCopy<NormalizedType> _min;
 
  bool _required;
  PropertyArrayCopy<ElementType> _noData;
  PropertyArrayCopy<NormalizedType> _defaultValue;
  PropertyType _propertyType;
 
  using PropertyDefinitionType = std::
      variant<ClassProperty, PropertyTableProperty, PropertyTextureProperty>;
  void getNumericPropertyValues(const PropertyDefinitionType& inProperty) {
    std::visit(
        [this](auto property) {
          bool isFixedSizeArray = this->_count > 0;
          if (property.offset) {
            if (isFixedSizeArray) {
              this->_offset = getArrayValue<NormalizedType>(*property.offset);
            }
            if (!isFixedSizeArray || this->_offset.size() != this->_count) {
              // The value was specified but something went wrong.
              _status = PropertyViewStatus::ErrorInvalidOffset;
              return;
            }
          }
 
          if (property.scale) {
            if (isFixedSizeArray) {
              this->_scale = getArrayValue<NormalizedType>(*property.scale);
            }
            if (!isFixedSizeArray || this->_scale.size() != this->_count) {
              // The value was specified but something went wrong.
              _status = PropertyViewStatus::ErrorInvalidScale;
              return;
            }
          }
 
          if (property.max) {
            if (isFixedSizeArray) {
              this->_max = getArrayValue<NormalizedType>(*property.max);
            }
            if (!isFixedSizeArray || this->_max.size() != this->_count) {
              // The value was specified but something went wrong.
              this->_status = PropertyViewStatus::ErrorInvalidMax;
              return;
            }
          }
 
          if (property.min) {
            if (isFixedSizeArray) {
              this->_min = getArrayValue<NormalizedType>(*property.min);
            }
            if (!isFixedSizeArray || this->_min.size() != this->_count) {
              // The value was specified but something went wrong.
              this->_status = PropertyViewStatus::ErrorInvalidMin;
              return;
            }
          }
        },
        inProperty);
  }
 
  template <typename T>
  static PropertyArrayCopy<T>
  getArrayValue(const CesiumUtility::JsonValue& jsonValue) {
    if (!jsonValue.isArray()) {
      return PropertyArrayCopy<T>();
    }
 
    const CesiumUtility::JsonValue::Array& array = jsonValue.getArray();
    std::vector<T> values(array.size());
 
    if constexpr (IsMetadataScalar<T>::value) {
      for (size_t i = 0; i < array.size(); i++) {
        std::optional<T> maybeElement = getScalar<T>(array[i]);
        if (!maybeElement.has_value()) {
          return PropertyArrayCopy<T>();
        }
        values[i] = *maybeElement;
      }
    }
 
    if constexpr (IsMetadataVecN<T>::value) {
      for (size_t i = 0; i < array.size(); i++) {
        std::optional<T> maybeElement = getVecN<T>(array[i]);
        if (!maybeElement.has_value()) {
          return PropertyArrayCopy<T>();
        }
        values[i] = *maybeElement;
      }
    }
 
    if constexpr (IsMetadataMatN<T>::value) {
      for (size_t i = 0; i < array.size(); i++) {
        std::optional<T> maybeElement = getMatN<T>(array[i]);
        if (!maybeElement.has_value()) {
          return PropertyArrayCopy<T>();
        }
        values[i] = *maybeElement;
      }
    }
 
    return PropertyArrayCopy<T>(values);
  }
};

template <> class PropertyView<PropertyArrayView<bool>> {
public:
  PropertyView()
      : _status(PropertyViewStatus::ErrorNonexistentProperty),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _count(0),
        _required(false),
        _defaultValue() {}

  PropertyView(const ClassProperty& classProperty)
      : _status(
            validateArrayPropertyType<PropertyArrayView<bool>>(classProperty)),
        _name(classProperty.name),
        _semantic(classProperty.semantic),
        _description(classProperty.description),
        _count(classProperty.count ? *classProperty.count : 0),
        _required(classProperty.required),
        _defaultValue() {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.defaultProperty) {
      if (!this->_required) {
        this->_defaultValue =
            getBooleanArrayValue(*classProperty.defaultProperty);
      }
 
      if (this->_defaultValue.size() == 0 ||
          (this->_count > 0 && this->_defaultValue.size() != this->_count)) {
        this->_status = PropertyViewStatus::ErrorInvalidDefaultValue;
        return;
      }
    }
  }
 
protected:
  PropertyView(PropertyViewStatusType status)
      : _status(status),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _count(0),
        _required(false),
        _defaultValue() {}

  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTableProperty& /*property*/,
      const CesiumGltf::Enum* /*pEnumDefinition*/)
      : PropertyView(classProperty) {}
 
public:
  PropertyViewStatusType status() const noexcept { return _status; }

  const std::optional<std::string>& name() const noexcept { return _name; }

  const std::optional<std::string>& semantic() const noexcept {
    return _semantic;
  }

  const std::optional<std::string>& description() const noexcept {
    return _description;
  }

  int64_t arrayCount() const noexcept { return _count; }

  bool normalized() const noexcept { return false; }

  std::optional<PropertyArrayView<bool>> offset() const noexcept {
    return std::nullopt;
  }

  std::optional<PropertyArrayView<bool>> scale() const noexcept {
    return std::nullopt;
  }

  std::optional<PropertyArrayView<bool>> max() const noexcept {
    return std::nullopt;
  }

  std::optional<PropertyArrayView<bool>> min() const noexcept {
    return std::nullopt;
  }

  bool required() const noexcept { return _required; }

  std::optional<PropertyArrayView<bool>> noData() const noexcept {
    return std::nullopt;
  }

  std::optional<PropertyArrayView<bool>> defaultValue() const noexcept {
    return this->_defaultValue.size() > 0
               ? std::make_optional(this->_defaultValue.view())
               : std::nullopt;
  }

  PropertyType propertyType() const noexcept { return PropertyType::Boolean; }
 
protected:
  PropertyViewStatusType _status;
 
private:
  std::optional<std::string> _name;
  std::optional<std::string> _semantic;
  std::optional<std::string> _description;
 
  int64_t _count;
  bool _required;
 
  PropertyArrayCopy<bool> _defaultValue;
 
  static PropertyArrayCopy<bool>
  getBooleanArrayValue(const CesiumUtility::JsonValue& jsonValue) {
    if (!jsonValue.isArray()) {
      return PropertyArrayCopy<bool>();
    }
    const CesiumUtility::JsonValue::Array& array = jsonValue.getArray();
 
    std::vector<bool> values(array.size());
    for (size_t i = 0; i < array.size(); i++) {
      if (!array[i].isBool()) {
        // The entire array is invalidated; return.
        return PropertyArrayCopy<bool>();
      }
      values[i] = array[i].getBool();
    }
    return values;
  }
};

template <> class PropertyView<PropertyArrayView<std::string_view>> {
public:
  PropertyView()
      : _status(PropertyViewStatus::ErrorNonexistentProperty),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _count(0),
        _required(false),
        _noData(),
        _defaultValue() {}

  PropertyView(const ClassProperty& classProperty)
      : _status(validateArrayPropertyType<PropertyArrayView<std::string_view>>(
            classProperty)),
        _name(classProperty.name),
        _semantic(classProperty.semantic),
        _description(classProperty.description),
        _count(classProperty.count ? *classProperty.count : 0),
        _required(classProperty.required),
        _noData(),
        _defaultValue() {
    if (_status != PropertyViewStatus::Valid) {
      return;
    }
 
    if (classProperty.noData) {
      if (!this->_required) {
        this->_noData = getStringArrayValue(*classProperty.noData);
      }
 
      if (this->_noData.size() == 0 ||
          (this->_count > 0 && this->_noData.size() != this->_count)) {
        this->_status = PropertyViewStatus::ErrorInvalidNoDataValue;
        return;
      }
    }
 
    if (classProperty.defaultProperty) {
      if (!this->_required) {
        this->_defaultValue =
            getStringArrayValue(*classProperty.defaultProperty);
      }
 
      if (this->_defaultValue.size() == 0 ||
          (this->_count > 0 && this->_defaultValue.size() != this->_count)) {
        // The value was specified but something went wrong.
        this->_status = PropertyViewStatus::ErrorInvalidDefaultValue;
        return;
      }
    }
  }
 
protected:
  PropertyView(PropertyViewStatusType status)
      : _status(status),
        _name(std::nullopt),
        _semantic(std::nullopt),
        _description(std::nullopt),
        _count(0),
        _required(false),
        _noData(),
        _defaultValue() {}

  PropertyView(
      const ClassProperty& classProperty,
      const PropertyTableProperty& /*property*/,
      const CesiumGltf::Enum* /*pEnumDefinition*/)
      : PropertyView(classProperty) {}
 
public:
  PropertyViewStatusType status() const noexcept { return _status; }

  const std::optional<std::string>& name() const noexcept { return _name; }

  const std::optional<std::string>& semantic() const noexcept {
    return _semantic;
  }

  const std::optional<std::string>& description() const noexcept {
    return _description;
  }

  int64_t arrayCount() const noexcept { return _count; }

  bool normalized() const noexcept { return false; }

  std::optional<PropertyArrayView<std::string_view>> offset() const noexcept {
    return std::nullopt;
  }

  std::optional<PropertyArrayView<std::string_view>> scale() const noexcept {
    return std::nullopt;
  }

  std::optional<PropertyArrayView<std::string_view>> max() const noexcept {
    return std::nullopt;
  }

  std::optional<PropertyArrayView<std::string_view>> min() const noexcept {
    return std::nullopt;
  }

  bool required() const noexcept { return _required; }

  std::optional<PropertyArrayView<std::string_view>> noData() const noexcept {
    return this->_noData.size() > 0 ? std::make_optional(this->_noData.view())
                                    : std::nullopt;
  }

  std::optional<PropertyArrayView<std::string_view>>
  defaultValue() const noexcept {
    return this->_defaultValue.size() > 0
               ? std::make_optional(this->_defaultValue.view())
               : std::nullopt;
  }

  PropertyType propertyType() const noexcept { return PropertyType::String; }
 
protected:
  PropertyViewStatusType _status;
 
private:
  std::optional<std::string> _name;
  std::optional<std::string> _semantic;
  std::optional<std::string> _description;
 
  int64_t _count;
  bool _required;
 
  PropertyArrayCopy<std::string_view> _noData;
  PropertyArrayCopy<std::string_view> _defaultValue;
 
  static PropertyArrayCopy<std::string_view>
  getStringArrayValue(const CesiumUtility::JsonValue& jsonValue) {
    if (!jsonValue.isArray()) {
      return PropertyArrayCopy<std::string_view>();
    }
 
    const CesiumUtility::JsonValue::Array& array = jsonValue.getArray();
    std::vector<std::string> strings(array.size());
 
    for (size_t i = 0; i < array.size(); i++) {
      if (!array[i].isString()) {
        // The entire array is invalidated; return.
        return PropertyArrayCopy<std::string_view>();
      }
      strings[i] = array[i].getString();
    }
 
    return PropertyArrayCopy<std::string_view>(strings);
  }
};
 
} // namespace CesiumGltf