package schema

import "fmt"

// StateObjectType describes an object type a module schema.
type StateObjectType struct {
	// Name is the name of the object type. It must be unique within the module schema amongst all object and enum
	// types and conform to the NameFormat regular expression.
	Name string `json:"name"`

	// KeyFields is a list of fields that make up the primary key of the object.
	// It can be empty, in which case, indexers should assume that this object is
	// a singleton and only has one value. Field names must be unique within the
	// object between both key and value fields.
	// Key fields CANNOT be nullable and Float32Kind, Float64Kind, JSONKind, StructKind,
	// OneOfKind, RepeatedKind, ListKind or ObjectKind
	// are NOT ALLOWED.
	// It is an INCOMPATIBLE change to add, remove or change fields in the key as this
	// changes the underlying primary key of the object.
	KeyFields []Field `json:"key_fields,omitempty"`

	// ValueFields is a list of fields that are not part of the primary key of the object.
	// It can be empty in the case where all fields are part of the primary key.
	// Field names must be unique within the object between both key and value fields.
	// ObjectKind fields are not allowed.
	// It is a COMPATIBLE change to add new value fields to an object type because
	// this does not affect the primary key of the object.
	// Existing value fields should not be removed or modified.
	ValueFields []Field `json:"value_fields,omitempty"`

	// RetainDeletions is a flag that indicates whether the indexer should retain
	// deleted rows in the database and flag them as deleted rather than actually
	// deleting the row. For many types of data in state, the data is deleted even
	// though it is still valid in order to save space. Indexers will want to have
	// the option of retaining such data and distinguishing from other "true" deletions.
	RetainDeletions bool `json:"retain_deletions,omitempty"`
}

// TypeName implements the Type interface.
func (o StateObjectType) TypeName() string {
	return o.Name
}

func (StateObjectType) isType() {}

// Validate validates the object type.
func (o StateObjectType) Validate(typeSet TypeSet) error {
	if !ValidateName(o.Name) {
		return fmt.Errorf("invalid object type name %q", o.Name)
	}

	fieldNames := map[string]bool{}

	for _, field := range o.KeyFields {
		if err := field.Validate(typeSet); err != nil {
			return fmt.Errorf("invalid key field %q in type %q: %v", field.Name, o.Name, err) //nolint:errorlint // false positive due to using go1.12
		}

		if !field.Kind.ValidKeyKind() {
			return fmt.Errorf("key field %q of kind %q uses an invalid key field kind", field.Name, field.Kind)
		}

		if field.Nullable {
			return fmt.Errorf("key field %q cannot be nullable", field.Name)
		}

		if fieldNames[field.Name] {
			return fmt.Errorf("duplicate key field name %q for stateObjectType: %s", field.Name, o.Name)
		}
		fieldNames[field.Name] = true
	}

	for _, field := range o.ValueFields {
		if err := field.Validate(typeSet); err != nil {
			return fmt.Errorf("invalid value field %q: %v", field.Name, err) //nolint:errorlint // false positive due to using go1.12
		}

		if fieldNames[field.Name] {
			return fmt.Errorf("duplicate field name %q for stateObjectType: %s", field.Name, o.Name)
		}
		fieldNames[field.Name] = true
	}

	if len(o.KeyFields) == 0 && len(o.ValueFields) == 0 {
		return fmt.Errorf("object type %q has no key or value fields", o.Name)
	}

	return nil
}

// ValidateObjectUpdate validates that the update conforms to the object type.
func (o StateObjectType) ValidateObjectUpdate(update StateObjectUpdate, typeSet TypeSet) error {
	if o.Name != update.TypeName {
		return fmt.Errorf("object type name %q does not match update type name %q", o.Name, update.TypeName)
	}

	if err := ValidateObjectKey(o.KeyFields, update.Key, typeSet); err != nil {
		return fmt.Errorf("invalid key for object type %q: %v", update.TypeName, err) //nolint:errorlint // false positive due to using go1.12
	}

	if update.Delete {
		return nil
	}

	return ValidateObjectValue(o.ValueFields, update.Value, typeSet)
}