package metadata

import (
	"crypto/x509"
	"fmt"
	"net/http"
	"net/url"
	"strings"
	"time"

	"github.com/google/uuid"
)

// Fetch creates a new HTTP client and gets the production metadata, decodes it, and parses it. This is an
// instrumentation simplification that makes it easier to either just grab the latest metadata or for implementers to
// see the rough process of retrieving it to implement any of their own logic.
func Fetch() (metadata *Metadata, err error) {
	var (
		decoder *Decoder
		payload *PayloadJSON
		resp    *http.Response
	)

	client := &http.Client{}

	if resp, err = client.Get(ProductionMDSURL); err != nil {
		return nil, err
	}

	defer func() {
		_ = resp.Body.Close()
	}()

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("error occurred fetching metadata: status code %d", resp.StatusCode)
	}

	if decoder, err = NewDecoder(WithIgnoreEntryParsingErrors()); err != nil {
		return nil, err
	}

	if payload, err = decoder.Decode(resp.Body); err != nil {
		return nil, err
	}

	return decoder.Parse(payload)
}

// Metadata represents a FIDO Metadata Service BLOB in either a fully parsed or partially parsed state.
type Metadata struct {
	// Parsed contains the successfully parsed BLOB payload entries.
	Parsed Parsed

	// Unparsed contains entries that failed to parse, along with their errors.
	Unparsed []EntryError
}

func (m *Metadata) ToMap() (metadata map[uuid.UUID]*Entry) {
	metadata = make(map[uuid.UUID]*Entry)

	for _, entry := range m.Parsed.Entries {
		if entry.AaGUID != uuid.Nil {
			metadata[entry.AaGUID] = &entry
		}
	}

	return metadata
}

// Parsed is a structure representing the Metadata BLOB Payload dictionary.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-service-v3.1.1-rd-20251016.html#sctn-mds-blob-payload
type Parsed struct {
	// The legalHeader, which MUST be in each BLOB, is an indication of the acceptance of the relevant legal agreement
	// for using the MDS.
	LegalHeader string

	// The serial number of this Metadata BLOB Payload. This serial number MUST be incremented whenever the contents
	// of the BLOB changes. Serial numbers MUST be consecutive and strictly monotonic, i.e. the successor BLOB will
	// have a no value exactly incremented by one.
	Number int

	// ISO-8601 formatted date when the next update will be provided at latest. The use of this field is discouraged
	// and may be removed in a future version of the spec.
	NextUpdate time.Time

	// List of zero or more MetadataBLOBPayloadEntry objects.
	Entries []Entry
}

// PayloadJSON is an intermediary JSON/JWT representation of the Metadata BLOB Payload dictionary and the JSON
// representation of the [Parsed] struct.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-service-v3.1.1-rd-20251016.html#sctn-mds-blob-payload
type PayloadJSON struct {
	// LegalHeader is an indication of the acceptance of the relevant legal agreement for using the MDS.
	LegalHeader string `json:"legalHeader"`

	// Number is the serial number of this Metadata BLOB Payload.
	Number int `json:"no"`

	// NextUpdate is an ISO-8601 formatted date when the next update will be provided at latest.
	NextUpdate string `json:"nextUpdate"`

	// Entries is a list of zero or more MetadataBLOBPayloadEntry objects.
	Entries []EntryJSON `json:"entries"`
}

func (j PayloadJSON) Parse() (payload Parsed, err error) {
	var update time.Time

	if update, err = time.Parse(time.DateOnly, j.NextUpdate); err != nil {
		return payload, fmt.Errorf("error occurred parsing next update value '%s': %w", j.NextUpdate, err)
	}

	n := len(j.Entries)

	entries := make([]Entry, n)

	for i := 0; i < n; i++ {
		if entries[i], err = j.Entries[i].Parse(); err != nil {
			return payload, fmt.Errorf("error occurred parsing entry %d: %w", i, err)
		}
	}

	return Parsed{
		LegalHeader: j.LegalHeader,
		Number:      j.Number,
		NextUpdate:  update,
		Entries:     entries,
	}, nil
}

// Entry is a structure representing the Metadata BLOB Payload Entry dictionary.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-service-v3.1.1-rd-20251016.html#sctn-mds-blob-pe
type Entry struct {
	// Aaid is the AAID of the authenticator this metadata BLOB payload entry relates to. This field MUST be set if
	// the authenticator implements FIDO UAF.
	Aaid string

	// AaGUID is the Authenticator Attestation GUID. This field MUST be set if the authenticator implements FIDO2.
	AaGUID uuid.UUID

	// AttestationCertificateKeyIdentifiers is a list of the attestation certificate public key identifiers encoded as
	// hex string. This field MUST be set if neither aaid nor aaguid are set.
	AttestationCertificateKeyIdentifiers []string

	// MetadataStatement is the metadataStatement JSON object as defined in FIDOMetadataStatement.
	MetadataStatement Statement

	// BiometricStatusReports is the status of the FIDO Biometric Certification of one or more biometric components of
	// the Authenticator.
	BiometricStatusReports []BiometricStatusReport

	// StatusReports is an array of status reports applicable to this authenticator.
	StatusReports []StatusReport

	// TimeOfLastStatusChange is an ISO-8601 formatted date since when the status report array was set to the current
	// value.
	TimeOfLastStatusChange time.Time

	// RogueListURL is a URL of a list of rogue (i.e. untrusted) individual authenticators.
	RogueListURL *url.URL

	// RogueListHash is the hash value computed over the Base64url encoding of the UTF-8 representation of the JSON
	// encoded rogueList available at rogueListURL (with type rogueListEntry[]). This hash value MUST be present and
	// non-empty whenever rogueListURL is present.
	RogueListHash string
}

// EntryJSON is an intermediary JSON/JWT structure representing the Metadata BLOB Payload Entry dictionary and
// the JSON representation of the [Entry] struct.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-service-v3.1.1-rd-20251016.html#sctn-mds-blob-pe
type EntryJSON struct {
	// Aaid is the AAID of the authenticator. Set if the authenticator implements FIDO UAF.
	Aaid string `json:"aaid"`

	// AaGUID is the Authenticator Attestation GUID. Set if the authenticator implements FIDO2.
	AaGUID string `json:"aaguid"`

	// AttestationCertificateKeyIdentifiers is a list of attestation certificate public key identifiers (hex).
	AttestationCertificateKeyIdentifiers []string `json:"attestationCertificateKeyIdentifiers"`

	// MetadataStatement is the metadataStatement JSON object as defined in FIDOMetadataStatement.
	MetadataStatement StatementJSON `json:"metadataStatement"`

	// BiometricStatusReports is the biometric certification status of one or more biometric components.
	BiometricStatusReports []BiometricStatusReportJSON `json:"biometricStatusReports"`

	// StatusReports is an array of status reports applicable to this authenticator.
	StatusReports []StatusReportJSON `json:"statusReports"`

	// TimeOfLastStatusChange is an ISO-8601 formatted date since when the status report array was set.
	TimeOfLastStatusChange string `json:"timeOfLastStatusChange"`

	// RogueListURL is a URL of a list of rogue (i.e. untrusted) individual authenticators.
	RogueListURL string `json:"rogueListURL"`

	// RogueListHash is the hash value computed over the Base64url encoding of the rogueList at rogueListURL.
	RogueListHash string `json:"rogueListHash"`
}

func (j EntryJSON) Parse() (entry Entry, err error) {
	var aaguid uuid.UUID

	if len(j.AaGUID) != 0 {
		if aaguid, err = uuid.Parse(j.AaGUID); err != nil {
			return entry, fmt.Errorf("error occurred parsing metadata entry with AAGUID '%s': error parsing AAGUID: %w", j.AaGUID, err)
		}
	}

	var statement Statement

	if statement, err = j.MetadataStatement.Parse(); err != nil {
		return entry, fmt.Errorf("error occurred parsing metadata entry with AAGUID '%s': %w", j.AaGUID, err)
	}

	var i, n int

	n = len(j.BiometricStatusReports)

	bsrs := make([]BiometricStatusReport, n)

	for i = 0; i < n; i++ {
		if bsrs[i], err = j.BiometricStatusReports[i].Parse(); err != nil {
			return entry, fmt.Errorf("error occurred parsing metadata entry with AAGUID '%s': error occurred parsing biometric status report %d: %w", j.AaGUID, i, err)
		}
	}

	n = len(j.StatusReports)

	srs := make([]StatusReport, n)

	for i = 0; i < n; i++ {
		if srs[i], err = j.StatusReports[i].Parse(); err != nil {
			return entry, fmt.Errorf("error occurred parsing metadata entry with AAGUID '%s': error occurred parsing status report %d: %w", j.AaGUID, i, err)
		}
	}

	var change time.Time

	if change, err = time.Parse(time.DateOnly, j.TimeOfLastStatusChange); err != nil {
		return entry, fmt.Errorf("error occurred parsing metadata entry with AAGUID '%s': error occurred parsing time of last status change value: %w", j.AaGUID, err)
	}

	var rogues *url.URL

	if len(j.RogueListURL) != 0 {
		if rogues, err = url.ParseRequestURI(j.RogueListURL); err != nil {
			return entry, fmt.Errorf("error occurred parsing metadata entry with AAGUID '%s': error occurred parsing rogue list URL value: %w", j.AaGUID, err)
		}

		if len(j.RogueListHash) == 0 {
			return entry, fmt.Errorf("error occurred parsing metadata entry with AAGUID '%s': error occurred validating rogue list URL value: the rogue list hash was absent", j.AaGUID)
		}
	}

	return Entry{
		Aaid:                                 j.Aaid,
		AaGUID:                               aaguid,
		AttestationCertificateKeyIdentifiers: j.AttestationCertificateKeyIdentifiers,
		MetadataStatement:                    statement,
		BiometricStatusReports:               bsrs,
		StatusReports:                        srs,
		TimeOfLastStatusChange:               change,
		RogueListURL:                         rogues,
		RogueListHash:                        j.RogueListHash,
	}, nil
}

// Statement is a structure representing the Metadata Statement dictionary. Authenticator metadata statements are used
// directly by the FIDO server at a relying party, but the information contained in the authoritative statement is used
// in several other places.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-statement-v3.1-ps-20250521.html#sctn-md-keys
type Statement struct {
	// The LegalHeader, if present, contains a legal guide for accessing and using metadata, which itself MAY contain
	// URL(s) pointing to further information, such as a full Terms and Conditions statement.
	LegalHeader string

	// Aaid is the Authenticator Attestation ID.
	Aaid string

	// AaGUID is the Authenticator Attestation GUID.
	AaGUID uuid.UUID

	// AttestationCertificateKeyIdentifiers is a list of the attestation certificate public key identifiers encoded as
	// hex string.
	AttestationCertificateKeyIdentifiers []string

	// FriendlyNames contains friendly names (i.e., public trade name) of the authenticator in multiple languages.
	FriendlyNames map[string]string

	// Description is a human-readable, short description of the authenticator, in English.
	Description string

	// AlternativeDescriptions is a list of human-readable short descriptions of the authenticator in different
	// languages.
	AlternativeDescriptions map[string]string

	// AuthenticatorVersion is the earliest (i.e. lowest) trustworthy authenticatorVersion meeting the requirements
	// specified in this metadata statement.
	AuthenticatorVersion uint32

	// ProtocolFamily is the FIDO protocol family. The values "uaf", "u2f", and "fido2" are supported.
	ProtocolFamily string

	// Schema is the Metadata Schema version.
	Schema uint16

	// Upv is the FIDO unified protocol version(s) (related to the specific protocol family) supported by this
	// authenticator.
	Upv []Version

	// AuthenticationAlgorithms is the list of authentication algorithms supported by the authenticator.
	AuthenticationAlgorithms []AuthenticationAlgorithm

	// PublicKeyAlgAndEncodings is the list of public key formats supported by the authenticator during registration
	// operations.
	PublicKeyAlgAndEncodings []PublicKeyAlgAndEncoding

	// AttestationTypes is the supported attestation type(s).
	AttestationTypes AuthenticatorAttestationTypes

	// UserVerificationDetails is a list of alternative VerificationMethodANDCombinations.
	UserVerificationDetails [][]VerificationMethodDescriptor

	// KeyProtection is a 16-bit number representing the bit fields defined by the KEY_PROTECTION constants in the FIDO
	// Registry of Predefined Values.
	KeyProtection []string

	// IsKeyRestricted is set to true or it is omitted, if the Uauth private key is restricted by the authenticator to
	// only sign valid FIDO signature assertions. This entry is set to false, if the authenticator doesn't restrict the
	// Uauth key to only sign valid FIDO signature assertions.
	IsKeyRestricted bool

	// IsFreshUserVerificationRequired is set to true or it is omitted, if Uauth key usage always requires a fresh user
	// verification. This entry is set to false, if the Uauth key can be used without requiring a fresh user
	// verification, i.e. without any additional user interaction, if the user was verified a (potentially configurable)
	// caching time ago.
	IsFreshUserVerificationRequired bool

	// MatcherProtection is a 16-bit number representing the bit fields defined by the MATCHER_PROTECTION constants in
	// the FIDO Registry of Predefined Values.
	MatcherProtection []string

	// CryptoStrength is the authenticator's overall claimed cryptographic strength in bits (sometimes also called
	// security strength or security level).
	CryptoStrength uint16

	// AttachmentHint is a 32-bit number representing the bit fields defined by the ATTACHMENT_HINT constants in the
	// FIDO Registry of Predefined Values.
	AttachmentHint []string

	// TcDisplay is a 16-bit number representing a combination of the bit flags defined by the
	// TRANSACTION_CONFIRMATION_DISPLAY constants in the FIDO Registry of Predefined Values.
	TcDisplay []string

	// TcDisplayContentType is the supported MIME content type [RFC2049] for the transaction confirmation display, such
	// as text/plain or image/png.
	TcDisplayContentType string

	// TcDisplayPNGCharacteristics is a list of alternative [DisplayPNGCharacteristicsDescriptor]. Each of these entries
	// is one alternative of supported image characteristics for displaying a PNG image.
	TcDisplayPNGCharacteristics []DisplayPNGCharacteristicsDescriptor

	// AttestationRootCertificates is a list of root certificates. Each element of this array represents a PKIX
	// [RFC5280] X.509 certificate that is a valid trust anchor for this authenticator model.
	// Multiple certificates might be used for different batches of the same model.
	// The array does not represent a certificate chain, but only the trust anchor of that chain.
	// A trust anchor can be a root certificate, an intermediate CA certificate, or even the attestation certificate
	// itself.
	AttestationRootCertificates []*x509.Certificate

	// EcdaaTrustAnchors is a list of trust anchors used for ECDAA attestation. This entry MUST be present if and only
	// if attestationType includes ATTESTATION_ECDAA.
	EcdaaTrustAnchors []EcdaaTrustAnchor

	// Icon is a 'data:' url [RFC2397] encoded [PNG] or [SVG11] (light mode) icon for the Authenticator (i.e., depicting
	// the security key). This icon is intended to be shown to users by RPs. Use of [SVG11] format is mandatory if any
	// of the iconDark, providerLogoLight and/or providerLogoDark is used in addition to icon. Use of [SVG11] is
	// recommended if only icon is used. The icon is more specific than the provider logo and should be shown if
	// present.
	Icon *url.URL

	// IconDark is a 'data:' url [RFC2397] encoded [SVG11] dark mode icon for the Authenticator (i.e., depicting the
	// security key). This icon is intended to be shown to users by RPs. The icon is more specific than the provider
	// logo and should be shown if present.
	IconDark *url.URL

	// ProviderLogoLight is a 'data:' url [RFC2397] encoded [SVG11] light mode icon for the provider (i.e., logomark of
	// the passkey provider). The SVG MUST meet all of the requirements defined in § 4.1 SVG requirements. This icon
	// is intended to be shown to users by RPs.
	ProviderLogoLight *url.URL

	// ProviderLogoDark is a 'data:' url [RFC2397] encoded [SVG11] dark mode icon for the provider (i.e., logomark of
	// the passkey provider). The SVG MUST meet all of the requirements defined in § 4.1 SVG requirements. This icon
	// is intended to be shown to users by RPs.
	ProviderLogoDark *url.URL

	// SupportedExtensions is a list of extensions supported by the authenticator.
	SupportedExtensions []ExtensionDescriptor

	// KeyScope of keys generated and maintained by this authenticator model.
	KeyScope KeyScope

	// MultiDeviceCredentialSupport describes the support for multi-device credentials.
	MultiDeviceCredentialSupport MultiDeviceCredentialSupport

	// AuthenticatorGetInfo describes supported versions, extensions, AAGUID of the device and its capabilities.
	AuthenticatorGetInfo AuthenticatorGetInfo

	// CredentialExportProtocolConfigURL specifies the URL for retrieving the configuration details for the credential
	// export protocol (CXP).
	CredentialExportProtocolConfigURL *url.URL
}

func (s *Statement) Verifier(x5cis []*x509.Certificate) (opts x509.VerifyOptions) {
	roots := x509.NewCertPool()

	for _, root := range s.AttestationRootCertificates {
		roots.AddCert(root)
	}

	var intermediates *x509.CertPool

	if len(x5cis) > 0 {
		intermediates = x509.NewCertPool()

		for _, x5c := range x5cis {
			intermediates.AddCert(x5c)
		}
	}

	return x509.VerifyOptions{
		Roots:         roots,
		Intermediates: intermediates,
	}
}

// StatementJSON is the JSON representation of the [Statement] struct.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-statement-v3.1-ps-20250521.html#sctn-md-keys
type StatementJSON struct {
	// LegalHeader contains a legal guide for accessing and using metadata.
	LegalHeader string `json:"legalHeader"`

	// Aaid is the Authenticator Attestation ID. Set if the authenticator implements FIDO UAF.
	Aaid string `json:"aaid"`

	// AaGUID is the Authenticator Attestation GUID. Set if the authenticator implements FIDO2.
	AaGUID string `json:"aaguid"`

	// AttestationCertificateKeyIdentifiers is a list of attestation certificate public key identifiers (hex).
	AttestationCertificateKeyIdentifiers []string `json:"attestationCertificateKeyIdentifiers"`

	// FriendlyNames contains friendly names of the authenticator in multiple languages.
	FriendlyNames map[string]string `json:"friendlyNames"`

	// Description is a human-readable, short description of the authenticator, in English.
	Description string `json:"description"`

	// AlternativeDescriptions is a list of human-readable short descriptions in different languages.
	AlternativeDescriptions map[string]string `json:"alternativeDescriptions"`

	// AuthenticatorVersion is the earliest trustworthy authenticatorVersion meeting the requirements in this statement.
	AuthenticatorVersion uint32 `json:"authenticatorVersion"`

	// ProtocolFamily is the FIDO protocol family. The values "uaf", "u2f", and "fido2" are supported.
	ProtocolFamily string `json:"protocolFamily"`

	// Schema is the Metadata Schema version.
	Schema uint16 `json:"schema"`

	// Upv is the FIDO unified protocol version(s) supported by this authenticator.
	Upv []Version `json:"upv"`

	// AuthenticationAlgorithms is the list of authentication algorithms supported by the authenticator.
	AuthenticationAlgorithms []AuthenticationAlgorithm `json:"authenticationAlgorithms"`

	// PublicKeyAlgAndEncodings is the list of public key formats supported during registration operations.
	PublicKeyAlgAndEncodings []PublicKeyAlgAndEncoding `json:"publicKeyAlgAndEncodings"`

	// AttestationTypes is the supported attestation type(s).
	AttestationTypes []AuthenticatorAttestationType `json:"attestationTypes"`

	// UserVerificationDetails is a list of alternative VerificationMethodANDCombinations.
	UserVerificationDetails [][]VerificationMethodDescriptor `json:"userVerificationDetails"`

	// KeyProtection is the key protection type(s).
	KeyProtection []string `json:"keyProtection"`

	// IsKeyRestricted indicates if the Uauth private key is restricted to only sign valid FIDO signature assertions.
	IsKeyRestricted bool `json:"isKeyRestricted"`

	// IsFreshUserVerificationRequired indicates if Uauth key usage always requires a fresh user verification.
	IsFreshUserVerificationRequired bool `json:"isFreshUserVerificationRequired"`

	// MatcherProtection is the matcher protection type(s).
	MatcherProtection []string `json:"matcherProtection"`

	// CryptoStrength is the authenticator's overall claimed cryptographic strength in bits.
	CryptoStrength uint16 `json:"cryptoStrength"`

	// AttachmentHint is the attachment hint(s).
	AttachmentHint []string `json:"attachmentHint"`

	// TcDisplay is the transaction confirmation display type(s).
	TcDisplay []string `json:"tcDisplay"`

	// TcDisplayContentType is the supported MIME content type for the transaction confirmation display.
	TcDisplayContentType string `json:"tcDisplayContentType"`

	// TcDisplayPNGCharacteristics is a list of alternative DisplayPNGCharacteristicsDescriptor.
	TcDisplayPNGCharacteristics []DisplayPNGCharacteristicsDescriptor `json:"tcDisplayPNGCharacteristics"`

	// AttestationRootCertificates is a list of base64-encoded trust anchor certificates for this authenticator model.
	AttestationRootCertificates []string `json:"attestationRootCertificates"`

	// EcdaaTrustAnchors is a list of trust anchors used for ECDAA attestation.
	EcdaaTrustAnchors []EcdaaTrustAnchor `json:"ecdaaTrustAnchors"`

	// Icon is a data: URL encoded PNG or SVG (light mode) icon for the Authenticator.
	Icon string `json:"icon"`

	// IconDark is a data: URL encoded SVG dark mode icon for the Authenticator.
	IconDark string `json:"iconDark"`

	// ProviderLogoLight is a data: URL encoded SVG light mode icon for the provider.
	ProviderLogoLight string `json:"providerLogoLight"`

	// ProviderLogoDark is a data: URL encoded SVG dark mode icon for the provider.
	ProviderLogoDark string `json:"providerLogoDark"`

	// SupportedExtensions is a list of extensions supported by the authenticator.
	SupportedExtensions []ExtensionDescriptor `json:"supportedExtensions"`

	// KeyScope of keys generated and maintained by this authenticator model.
	KeyScope KeyScope `json:"keyScope"`

	// MultiDeviceCredentialSupport describes the support for multi-device credentials.
	MultiDeviceCredentialSupport MultiDeviceCredentialSupport `json:"multiDeviceCredentialSupport"`

	// AuthenticatorGetInfo describes supported versions, extensions, AAGUID of the device and its capabilities.
	AuthenticatorGetInfo AuthenticatorGetInfoJSON `json:"authenticatorGetInfo"`

	// CredentialExportProtocolConfigURL specifies the URL for the credential export protocol (CXP) configuration.
	CredentialExportProtocolConfigURL string `json:"cxpConfigURL"`
}

// Parse converts StatementJSON into a [Statement] object, validating and parsing its fields. Returns an error on failure.
//
//nolint:gocyclo
func (j StatementJSON) Parse() (statement Statement, err error) {
	var aaguid uuid.UUID

	if len(j.AaGUID) != 0 {
		if aaguid, err = uuid.Parse(j.AaGUID); err != nil {
			return statement, fmt.Errorf("error occurred parsing statement with description '%s': error occurred parsing AAGUID value: %w", j.Description, err)
		}
	}

	n := len(j.AttestationRootCertificates)

	certificates := make([]*x509.Certificate, n)

	for i := 0; i < n; i++ {
		if certificates[i], err = mdsParseX509Certificate(j.AttestationRootCertificates[i]); err != nil {
			return statement, fmt.Errorf("error occurred parsing statement with description '%s': error occurred parsing attestation root certificate %d value: %w", j.Description, i, err)
		}
	}

	var (
		icon, iconDark *url.URL

		logoLight, logoDark *url.URL

		cxpConfigURL *url.URL
	)

	if len(j.Icon) != 0 {
		if icon, err = url.ParseRequestURI(j.Icon); err != nil {
			return statement, fmt.Errorf("error occurred parsing statement with description '%s': error occurred parsing icon value: %w", j.Description, err)
		}
	}

	if len(j.IconDark) != 0 {
		if iconDark, err = url.ParseRequestURI(j.IconDark); err != nil {
			return statement, fmt.Errorf("error occurred parsing statement with description '%s': error occurred parsing icon dark value: %w", j.Description, err)
		}
	}

	if len(j.ProviderLogoLight) != 0 {
		if logoLight, err = url.ParseRequestURI(j.ProviderLogoLight); err != nil {
			return statement, fmt.Errorf("error occurred parsing statement with description '%s': error occurred parsing provider logo light value: %w", j.Description, err)
		}
	}

	if len(j.ProviderLogoDark) != 0 {
		if logoDark, err = url.ParseRequestURI(j.ProviderLogoDark); err != nil {
			return statement, fmt.Errorf("error occurred parsing statement with description '%s': error occurred parsing provider logo dark value: %w", j.Description, err)
		}
	}

	if len(j.CredentialExportProtocolConfigURL) != 0 {
		if cxpConfigURL, err = url.ParseRequestURI(j.CredentialExportProtocolConfigURL); err != nil {
			return statement, fmt.Errorf("error occurred parsing statement with description '%s': error occurred parsing cxp config url value: %w", j.Description, err)
		}
	}

	var info AuthenticatorGetInfo

	if info, err = j.AuthenticatorGetInfo.Parse(); err != nil {
		return statement, fmt.Errorf("error occurred parsing statement with description '%s': error occurred parsing authenticator get info value: %w", j.Description, err)
	}

	return Statement{
		LegalHeader:                          j.LegalHeader,
		Aaid:                                 j.Aaid,
		AaGUID:                               aaguid,
		AttestationCertificateKeyIdentifiers: j.AttestationCertificateKeyIdentifiers,
		FriendlyNames:                        j.FriendlyNames,
		Description:                          j.Description,
		AlternativeDescriptions:              j.AlternativeDescriptions,
		AuthenticatorVersion:                 j.AuthenticatorVersion,
		ProtocolFamily:                       j.ProtocolFamily,
		Schema:                               j.Schema,
		Upv:                                  j.Upv,
		AuthenticationAlgorithms:             j.AuthenticationAlgorithms,
		PublicKeyAlgAndEncodings:             j.PublicKeyAlgAndEncodings,
		AttestationTypes:                     j.AttestationTypes,
		UserVerificationDetails:              j.UserVerificationDetails,
		KeyProtection:                        j.KeyProtection,
		IsKeyRestricted:                      j.IsKeyRestricted,
		IsFreshUserVerificationRequired:      j.IsFreshUserVerificationRequired,
		MatcherProtection:                    j.MatcherProtection,
		CryptoStrength:                       j.CryptoStrength,
		AttachmentHint:                       j.AttachmentHint,
		TcDisplay:                            j.TcDisplay,
		TcDisplayContentType:                 j.TcDisplayContentType,
		TcDisplayPNGCharacteristics:          j.TcDisplayPNGCharacteristics,
		AttestationRootCertificates:          certificates,
		EcdaaTrustAnchors:                    j.EcdaaTrustAnchors,
		Icon:                                 icon,
		IconDark:                             iconDark,
		ProviderLogoLight:                    logoLight,
		ProviderLogoDark:                     logoDark,
		SupportedExtensions:                  j.SupportedExtensions,
		KeyScope:                             j.KeyScope,
		MultiDeviceCredentialSupport:         j.MultiDeviceCredentialSupport,
		AuthenticatorGetInfo:                 info,
		CredentialExportProtocolConfigURL:    cxpConfigURL,
	}, nil
}

// BiometricStatusReport is a structure representing the BiometricStatusReport dictionary. Contains the current
// BiometricStatusReport of one of the authenticator's biometric component.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-service-v3.1.1-rd-20251016.html#sctn-bio-stat-rep
type BiometricStatusReport struct {
	// CertLevel is the achieved level of the biometric certification of this biometric component of the authenticator.
	CertLevel uint16

	// Modality is a single USER_VERIFY short form case-sensitive string name constant, representing biometric modality.
	Modality string

	// EffectiveDate is an ISO-8601 formatted date since when the certLevel achieved, if applicable. If no date is
	// given, the status is assumed to be effective while present.
	EffectiveDate time.Time

	// CertificationDescriptor describes the externally visible aspects of the Biometric Certification evaluation.
	CertificationDescriptor string

	// CertificateNumber is the unique identifier for the issued Biometric Certification.
	CertificateNumber string

	// CertificationPolicyVersion is the version of the Biometric Certification Policy the implementation is Certified
	// to, i.e. "1.0.0".
	CertificationPolicyVersion string

	// CertificationRequirementsVersion is the version of the Biometric Requirements [FIDOBiometricsRequirements] the
	// implementation is certified to, i.e. "1.0.0".
	CertificationRequirementsVersion string
}

// BiometricStatusReportJSON is the JSON representation of the [BiometricStatusReport] struct.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-service-v3.1.1-rd-20251016.html#sctn-bio-stat-rep
type BiometricStatusReportJSON struct {
	// CertLevel is the achieved level of the biometric certification of this biometric component.
	CertLevel uint16 `json:"certLevel"`

	// Modality is a single USER_VERIFY short form string constant representing the biometric modality.
	Modality string `json:"modality"`

	// EffectiveDate is an ISO-8601 formatted date since when the certLevel was achieved.
	EffectiveDate string `json:"effectiveDate"`

	// CertificationDescriptor describes the externally visible aspects of the Biometric Certification evaluation.
	CertificationDescriptor string `json:"certificationDescriptor"`

	// CertificateNumber is the unique identifier for the issued Biometric Certification.
	CertificateNumber string `json:"certificateNumber"`

	// CertificationPolicyVersion is the version of the Biometric Certification Policy, i.e. "1.0.0".
	CertificationPolicyVersion string `json:"certificationPolicyVersion"`

	// CertificationRequirementsVersion is the version of the Biometric Requirements, i.e. "1.0.0".
	CertificationRequirementsVersion string `json:"certificationRequirementsVersion"`
}

func (j BiometricStatusReportJSON) Parse() (report BiometricStatusReport, err error) {
	var effective time.Time

	if effective, err = time.Parse(time.DateOnly, j.EffectiveDate); err != nil {
		return report, fmt.Errorf("error occurred parsing effective date value: %w", err)
	}

	return BiometricStatusReport{
		CertLevel:                        j.CertLevel,
		Modality:                         j.Modality,
		EffectiveDate:                    effective,
		CertificationDescriptor:          j.CertificationDescriptor,
		CertificateNumber:                j.CertificateNumber,
		CertificationPolicyVersion:       j.CertificationPolicyVersion,
		CertificationRequirementsVersion: j.CertificationRequirementsVersion,
	}, nil
}

// StatusReport is a structure representing the StatusReport dictionary. Contains an [AuthenticatorStatus] and additional
// data associated with it, if any.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-service-v3.1.1-rd-20251016.html#sctn-stat-rep
type StatusReport struct {
	// Status of the authenticator. Additional fields MAY be set depending on this value.
	Status AuthenticatorStatus

	// EffectiveDate is an ISO-8601 formatted date since when the status code was set, if applicable. If no date is
	// given, the status is assumed to be effective while present.
	EffectiveDate time.Time

	// AuthenticatorVersion is the authenticator version (firmware version) that this status report relates to. In the
	// case of FIDO_CERTIFIED* status values, the status applies to higher authenticatorVersions until there is a new
	// statusReport.
	AuthenticatorVersion uint32

	// BatchCertificate is a Base64-encoded [RFC4648] (not base64url!) DER [ITU-X690-2008] PKIX certificate value
	// related to the current status, if applicable.
	BatchCertificate *x509.Certificate

	// Certificate is a Base64-encoded [RFC4648] (not base64url!) DER [ITU-X690-2008] PKIX certificate value related to
	// the current status, if applicable. This field will typically not be present if field batchCertificate is present.
	Certificate *x509.Certificate

	// URL is a HTTPS URL where additional information may be found related to the current status, if applicable.
	URL *url.URL

	// CertificationDescriptor describes the externally visible aspects of the Authenticator Certification evaluation.
	CertificationDescriptor string

	// CertificateNumber is the unique identifier for the issued Certification.
	CertificateNumber string

	// CertificationPolicyVersion is the version of the Authenticator Certification Policy the implementation is
	// Certified to, i.e. "1.0.0".
	CertificationPolicyVersion string

	// CertificationProfiles is a list of certification profile strings. Each entry represents a supported
	// certification profile, i.e. "consumer" or "enterprise".
	CertificationProfiles []string

	// CertificationRequirementsVersion is the Document Version of the Authenticator Security Requirements (DV)
	// [FIDOAuthenticatorSecurityRequirements] the implementation is certified to, i.e. "1.2.0".
	CertificationRequirementsVersion string

	// SunsetDate is an ISO-8601 formatted date since when the status will expire, if applicable. If no date is given,
	// the status is assumed to not have a scheduled expiry.
	SunsetDate *time.Time

	// FIPSRevision is the revision number of the FIPS 140 specification, i.e. "3" in the case of FIPS 140-3. This
	// entry MUST be present if and only if the status entry is one of FIPS140_CERTIFIED_L*.
	FIPSRevision uint32

	// FIPSPhysicalSecurityLevel is the "physical security level" of the FIPS certification. This entry MUST be present
	// if and only if the status entry is one of FIPS140_CERTIFIED_L*. It MUST reflect the physical security level
	// which might deviate from the overall level.
	FIPSPhysicalSecurityLevel uint32
}

// StatusReportJSON is the JSON representation of the [StatusReport] struct.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-service-v3.1.1-rd-20251016.html#sctn-stat-rep
type StatusReportJSON struct {
	// Status of the authenticator. Additional fields MAY be set depending on this value.
	Status AuthenticatorStatus `json:"status"`

	// EffectiveDate is an ISO-8601 formatted date since when the status code was set.
	EffectiveDate string `json:"effectiveDate"`

	// AuthenticatorVersion is the authenticator version (firmware version) that this status report relates to.
	AuthenticatorVersion uint32 `json:"authenticatorVersion"`

	// BatchCertificate is a Base64-encoded DER PKIX certificate related to the current status.
	BatchCertificate string `json:"batchCertificate"`

	// Certificate is a Base64-encoded DER PKIX certificate related to the current status.
	Certificate string `json:"certificate"`

	// URL is a HTTPS URL where additional information may be found related to the current status.
	URL string `json:"url"`

	// CertificationDescriptor describes the externally visible aspects of the Authenticator Certification evaluation.
	CertificationDescriptor string `json:"certificationDescriptor"`

	// CertificateNumber is the unique identifier for the issued Certification.
	CertificateNumber string `json:"certificateNumber"`

	// CertificationPolicyVersion is the version of the Authenticator Certification Policy, i.e. "1.0.0".
	CertificationPolicyVersion string `json:"certificationPolicyVersion"`

	// CertificationProfiles is a list of supported certification profiles, i.e. "consumer" or "enterprise".
	CertificationProfiles []string `json:"certificationProfiles"`

	// CertificationRequirementsVersion is the Document Version of the Authenticator Security Requirements, i.e. "1.2.0".
	CertificationRequirementsVersion string `json:"certificationRequirementsVersion"`

	// SunsetDate is an ISO-8601 formatted date when the status will expire.
	SunsetDate string `json:"sunsetDate"`

	// FIPSRevision is the revision number of the FIPS 140 specification, i.e. "3" for FIPS 140-3.
	FIPSRevision uint32 `json:"fipsRevision"`

	// FIPSPhysicalSecurityLevel is the physical security level of the FIPS certification.
	FIPSPhysicalSecurityLevel uint32 `json:"fipsPhysicalSecurityLevel"`
}

func (j StatusReportJSON) Parse() (report StatusReport, err error) {
	var (
		certificate, batchCertificate *x509.Certificate
	)

	if len(j.Certificate) != 0 {
		if certificate, err = mdsParseX509Certificate(j.Certificate); err != nil {
			return report, fmt.Errorf("error occurred parsing certificate value: %w", err)
		}
	}

	if len(j.BatchCertificate) != 0 {
		if batchCertificate, err = mdsParseX509Certificate(j.BatchCertificate); err != nil {
			return report, fmt.Errorf("error occurred parsing batch certificate value: %w", err)
		}
	}

	var (
		effective time.Time
		sunset    *time.Time
	)

	if effective, err = time.Parse(time.DateOnly, j.EffectiveDate); err != nil {
		return report, fmt.Errorf("error occurred parsing effective date value: %w", err)
	}

	if sunset, err = mdsParseTimePointer(time.DateOnly, j.SunsetDate); err != nil {
		return report, fmt.Errorf("error occurred parsing sunset date value: %w", err)
	}

	var uri *url.URL

	if len(j.URL) != 0 {
		if uri, err = url.ParseRequestURI(j.URL); err != nil {
			if !strings.HasPrefix(j.URL, "http") {
				var e error
				if uri, e = url.ParseRequestURI(fmt.Sprintf("https://%s", j.URL)); e != nil {
					return report, fmt.Errorf("error occurred parsing URL value: %w", err)
				}
			}
		}
	}

	return StatusReport{
		Status:                           j.Status,
		EffectiveDate:                    effective,
		AuthenticatorVersion:             j.AuthenticatorVersion,
		BatchCertificate:                 batchCertificate,
		Certificate:                      certificate,
		URL:                              uri,
		CertificationDescriptor:          j.CertificationDescriptor,
		CertificateNumber:                j.CertificateNumber,
		CertificationPolicyVersion:       j.CertificationPolicyVersion,
		CertificationProfiles:            j.CertificationProfiles,
		CertificationRequirementsVersion: j.CertificationRequirementsVersion,
		SunsetDate:                       sunset,
		FIPSRevision:                     j.FIPSRevision,
		FIPSPhysicalSecurityLevel:        j.FIPSPhysicalSecurityLevel,
	}, nil
}

// RogueListEntry is a structure representing the RogueListEntry dictionary.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-service-v3.1.1-rd-20251016.html#sctn-rogue-list-entry
type RogueListEntry struct {
	// Sk is the base64url encoding of the rogue authenticator's secret key.
	Sk string `json:"sk"`

	// Data is the ISO-8601 formatted date since when this entry is effective.
	Date string `json:"date"`
}

// CodeAccuracyDescriptor is a structure representing the CodeAccuracyDescriptor dictionary.
// It describes the relevant accuracy/complexity aspects of passcode user verification methods.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-statement-v3.1-ps-20250521.html#sctn-type-cad
type CodeAccuracyDescriptor struct {
	// Base is the numeric system base (radix) of the code, i.e. 10 in the case of decimal digits.
	Base uint16 `json:"base"`

	// MinLength is the minimum number of digits of the given base required for that code, i.e. 4 in the case of 4
	// digits.
	MinLength uint16 `json:"minLength"`

	// MaxRetries is the maximum number of false attempts before the authenticator will block this method (at least for
	// some time). 0 means it will never block.
	MaxRetries uint16 `json:"maxRetries"`

	// BlockSlowdown is the enforced minimum number of seconds wait time after blocking (i.e. due to forced reboot or
	// similar). 0 means this user verification method will be blocked, either permanently, or until an alternative user
	// verification method method succeeded. All alternative user verification methods MUST be specified appropriately
	// in the Metadata in userVerificationDetails.
	BlockSlowdown uint16 `json:"blockSlowdown"`
}

// BiometricAccuracyDescriptor is a structure representing the BiometricAccuracyDescriptor dictionary.
// It describes relevant accuracy/complexity aspects in the case of a biometric user verification method.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-statement-v3.1-ps-20250521.html#sctn-type-bad
type BiometricAccuracyDescriptor struct {
	// SelfAttestedFRR is the false rejection rate [ISO19795-1] for a single template, i.e. the percentage of
	// verification transactions with truthful claims of identity that are incorrectly denied.
	SelfAttestedFRR float64 `json:"selfAttestedFRR"`

	// SelfAttestedFAR is the false acceptance rate [ISO19795-1] for a single template, i.e. the percentage of
	// verification transactions with wrongful claims of identity that are incorrectly confirmed.
	SelfAttestedFAR float64 `json:"selfAttestedFAR"`

	// ImposterAttackPresentationAcceptRateThreshold is the threshold for Impostor Attack Presentation Accept Rate
	// (IAPAR) is the proportion of impostor attack presentations using the same presentation attack instrument (PAI)
	// species that result in accept [isoiec-30107-3]. For biometric certification requirements
	// [FIDOBiometricsRequirements], certification can be achieved for an IAPAR threshold of less than 7% OR less than
	// 15% for each of the PAI species tested.
	ImposterAttackPresentationAcceptRateThreshold float64 `json:"iAPARThreshold"`

	// MaxTemplates is the maximum number of alternative templates from different fingers allowed.
	MaxTemplates uint16 `json:"maxTemplates"`

	// MaxRetries is the maximum number of false attempts before the authenticator will block this method (at least for
	// some time). 0 means it will never block.
	MaxRetries uint16 `json:"maxRetries"`

	// BlockSlowdown is the enforced minimum number of seconds wait time after blocking (i.e. due to forced reboot or
	// similar).0 means that this user verification method will be blocked either permanently or until an alternative
	// user verification method succeeded. All alternative user verification methods MUST be specified appropriately in
	// the metadata in userVerificationDetails.
	BlockSlowdown uint16 `json:"blockSlowdown"`
}

// PatternAccuracyDescriptor is a structure representing the PatternAccuracyDescriptor dictionary.
// It describes relevant accuracy/complexity aspects in the case that a pattern is used as the user verification method.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-statement-v3.1-ps-20250521.html#sctn-type-pad
type PatternAccuracyDescriptor struct {
	// MinComplexity is the number of possible patterns (having the minimum length) out of which exactly one would be
	// the right one, i.e. 1/probability in the case of equal distribution.
	MinComplexity uint32 `json:"minComplexity"`

	// MaxRetries is the maximum number of false attempts before the authenticator will block authentication using this
	// method (at least temporarily). 0 means it will never block.
	MaxRetries uint16 `json:"maxRetries"`

	// BlockSlowdown is the enforced minimum number of seconds wait time after blocking (due to forced reboot or similar
	// mechanism). 0 means this user verification method will be blocked, either permanently, or until an alternative
	// user verification method method succeeded. All alternative user verification methods MUST be specified
	// appropriately in the metadata under userVerificationDetails.
	BlockSlowdown uint16 `json:"blockSlowdown"`
}

// VerificationMethodDescriptor is a structure representing the VerificationMethodDescriptor dictionary.
// It describes a descriptor for a specific base user verification method as implemented by the authenticator.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-statement-v3.1-ps-20250521.html#sctn-type-vmd
type VerificationMethodDescriptor struct {
	// UserVerificationMethod is a single USER_VERIFY constant (see [FIDORegistry]), not a bit flag combination. This
	// value MUST be non-zero.
	UserVerificationMethod string `json:"userVerificationMethod"`

	// CaDesc nay optionally be used in the case of method USER_VERIFY_PASSCODE.
	CaDesc CodeAccuracyDescriptor `json:"caDesc"`

	// BaDesc may optionally be used in the case of method USER_VERIFY_FINGERPRINT, USER_VERIFY_VOICEPRINT,
	// USER_VERIFY_FACEPRINT, USER_VERIFY_EYEPRINT, or USER_VERIFY_HANDPRINT.
	BaDesc BiometricAccuracyDescriptor `json:"baDesc"`

	// PaDesc may optionally be used in case of method USER_VERIFY_PATTERN.
	PaDesc PatternAccuracyDescriptor `json:"paDesc"`
}

// RGBPaletteEntry is a structure representing the RGBPaletteEntry dictionary.
// It describes an RGB three-sample tuple palette entry.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-statement-v3.1-ps-20250521.html#sctn-type-rgbpe
type RGBPaletteEntry struct {
	// R is the red channel sample value.
	R uint16 `json:"r"`

	// G is the green channel sample value.
	G uint16 `json:"g"`

	// B is the blue channel sample value.
	B uint16 `json:"b"`
}

// DisplayPNGCharacteristicsDescriptor is a structure representing the DisplayPNGCharacteristicsDescriptor MDS3.1
// dictionary. It describes a PNG image characteristics as defined in the PNG [PNG] spec for IHDR (image header) and
// PLTE (palette table).
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-statement-v3.1-ps-20250521.html#sctn-type-dpngcd
type DisplayPNGCharacteristicsDescriptor struct {
	// Width of the image.
	Width uint32 `json:"width"`

	// Height of the image.
	Height uint32 `json:"height"`

	// BitDepth is bits per sample or per palette index.
	BitDepth byte `json:"bitDepth"`

	// ColorType defines the PNG image type.
	ColorType byte `json:"colorType"`

	// Compression method used to compress the image data.
	Compression byte `json:"compression"`

	// Filter method is the preprocessing method applied to the image data before compression.
	Filter byte `json:"filter"`

	// Interlace method is the transmission order of the image data.
	Interlace byte `json:"interlace"`

	// Plte is a number 1 to 256 representing palette entries.
	Plte []RGBPaletteEntry `json:"plte"`
}

// EcdaaTrustAnchor is a structure representing the EcdaaTrustAnchor dictionary.
// In the case of ECDAA attestation, the ECDAA-Issuer's trust anchor MUST be specified in this field.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-statement-v3.1-ps-20250521.html#sctn-type-ecdaata
type EcdaaTrustAnchor struct {
	// X is the base64url encoding of the result of ECPoint2ToB of the ECPoint2 X.
	X string `json:"X"`

	// Y is the base64url encoding of the result of ECPoint2ToB of the ECPoint2 Y.
	Y string `json:"Y"`

	// C is the base64url encoding of the result of BigNumberToB(c).
	C string `json:"c"`

	// SX is the base64url encoding of the result of BigNumberToB(sx).
	SX string `json:"sx"`

	// SY is the base64url encoding of the result of BigNumberToB(sy).
	SY string `json:"sy"`

	// G1Curve is the name of the Barreto-Naehrig elliptic curve for G1. "BN_P256", "BN_P638", "BN_ISOP256", and
	// "BN_ISOP512" are supported.
	G1Curve string `json:"G1Curve"`
}

// ExtensionDescriptor is a structure representing the ExtensionDescriptor dictionary.
// This descriptor contains an extension supported by the authenticator.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-statement-v3.1-ps-20250521.html#sctn-type-ed
type ExtensionDescriptor struct {
	// ID identifies the extension.
	ID string `json:"id"`

	// Tag of the extension if this was assigned. TAGs are assigned to extensions if they could appear in an assertion.
	Tag uint16 `json:"tag"`

	// Data contains arbitrary data further describing the extension and/or data needed to correctly process the
	// extension.
	Data string `json:"data"`

	// FailIfUnknown indicates whether unknown extensions must be ignored (false) or must lead to an error (true) when
	// the extension is to be processed by the FIDO Server, FIDO Client, ASM, or FIDO Authenticator.
	FailIfUnknown bool `json:"fail_if_unknown"`
}

// Version is a structure representing the Version FIDO UAF Protocol 1.2 dictionary and represents a generic version
// with major and minor fields.
//
// See: https://fidoalliance.org/specs/fido-uaf-v1.2-ps-20201020/fido-uaf-protocol-v1.2-ps-20201020.html#version-interface
type Version struct {
	// Major version.
	Major uint16 `json:"major"`

	// Minor version.
	Minor uint16 `json:"minor"`
}

// AuthenticatorGetInfo is a structure representing the AuthenticatorGetInfo dictionary.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-statement-v3.1-ps-20250521.html#sctn-type-agid
type AuthenticatorGetInfo struct {
	// Versions is a list of supported versions.
	Versions []string

	// Extensions is a list of supported extensions.
	Extensions []string

	// AaGUID is the claimed AAGUID.
	AaGUID uuid.UUID

	// Options is a list of supported options.
	Options map[string]bool

	// MaxMsgSize is the maximum message size supported by the authenticator.
	MaxMsgSize uint

	// PivUvAuthProtocols is a list of supported PIN/UV auth protocols in order of decreasing authenticator preference.
	PivUvAuthProtocols []uint

	// MaxCredentialCountInList is the maximum number of credentials supported in credentialID list at a time by the
	// authenticator.
	MaxCredentialCountInList uint

	// MaxCredentialIdLength is the maximum Credential ID Length supported by the authenticator.
	MaxCredentialIdLength uint

	// Transports is the list of supported transports.
	Transports []string

	// Algorithms is the list of supported algorithms for credential generation, as specified in WebAuthn.
	Algorithms []PublicKeyCredentialParameters

	// MaxSerializedLargeBlobArray is the maximum size, in bytes, of the serialized large-blob array that this
	// authenticator can store.
	MaxSerializedLargeBlobArray uint

	// ForcePINChange indicates if the PIN must be changed.
	ForcePINChange bool

	// MinPINLength specifies the current minimum PIN length, in Unicode code points, the authenticator enforces for ClientPIN.
	MinPINLength uint

	// FirmwareVersion indicates the firmware version of the authenticator model identified by AAGUID.
	FirmwareVersion uint

	// MaxCredBlobLength indicates the maximum credential blob length in bytes supported by the authenticator.
	MaxCredBlobLength uint

	// MaxRPIDsForSetMinPINLength specifies the max number of RP IDs that authenticator can set via setMinPINLength
	// subcommand.
	MaxRPIDsForSetMinPINLength uint

	// PreferredPlatformUvAttempts specifies the preferred number of invocations of the
	// getPinUvAuthTokenUsingUvWithPermissions subCommand the platform may attempt before falling back to the
	// getPinUvAuthTokenUsingPinWithPermissions subCommand or displaying an error.
	PreferredPlatformUvAttempts uint

	// UvModality specifies the user verification modality supported by the authenticator via authenticatorClientPIN's
	// getPinUvAuthTokenUsingUvWithPermissions subcommand.
	UvModality uint

	// Certifications specifies a list of authenticator certifications.
	Certifications map[string]float64

	// RemainingDiscoverableCredentials if present indicates the estimated number of additional discoverable credentials
	// that can be stored.
	RemainingDiscoverableCredentials uint

	// VendorPrototypeConfigCommands if present the authenticator supports the authenticatorConfig vendorPrototype
	// subcommand, and its value is a list of authenticatorConfig vendorCommandId values supported, which MAY be empty.
	VendorPrototypeConfigCommands []uint
}

// AuthenticatorGetInfoJSON is the JSON representation of the [AuthenticatorGetInfo] struct. The members mirror the
// fields returned by the CTAP authenticatorGetInfo command.
//
// See: https://fidoalliance.org/specs/mds/fido-metadata-statement-v3.1-ps-20250521.html#sctn-type-agid
type AuthenticatorGetInfoJSON struct {
	// Versions is a list of supported CTAP versions.
	Versions []string `json:"versions"`

	// Extensions is a list of supported extensions.
	Extensions []string `json:"extensions"`

	// AaGUID is the claimed AAGUID.
	AaGUID string `json:"aaguid"`

	// Options is a map of supported options.
	Options map[string]bool `json:"options"`

	// MaxMsgSize is the maximum message size supported by the authenticator.
	MaxMsgSize uint `json:"maxMsgSize"`

	// PivUvAuthProtocols is a list of supported PIN/UV auth protocols in order of decreasing authenticator preference.
	PivUvAuthProtocols []uint `json:"pinUvAuthProtocols"`

	// MaxCredentialCountInList is the maximum number of credentials supported in credentialID list at a time.
	MaxCredentialCountInList uint `json:"maxCredentialCountInList"`

	// MaxCredentialIdLength is the maximum Credential ID Length supported by the authenticator.
	MaxCredentialIdLength uint `json:"maxCredentialIdLength"`

	// Transports is the list of supported transports.
	Transports []string `json:"transports"`

	// Algorithms is the list of supported algorithms for credential generation.
	Algorithms []PublicKeyCredentialParameters `json:"algorithms"`

	// MaxSerializedLargeBlobArray is the maximum size, in bytes, of the serialized large-blob array.
	MaxSerializedLargeBlobArray uint `json:"maxSerializedLargeBlobArray"`

	// ForcePINChange indicates if the PIN must be changed.
	ForcePINChange bool `json:"forcePINChange"`

	// MinPINLength specifies the current minimum PIN length, in Unicode code points.
	MinPINLength uint `json:"minPINLength"`

	// FirmwareVersion indicates the firmware version of the authenticator model identified by AAGUID.
	FirmwareVersion uint `json:"firmwareVersion"`

	// MaxCredBlobLength indicates the maximum credential blob length in bytes.
	MaxCredBlobLength uint `json:"maxCredBlobLength"`

	// MaxRPIDsForSetMinPINLength specifies the max number of RP IDs that can be set via setMinPINLength subcommand.
	MaxRPIDsForSetMinPINLength uint `json:"maxRPIDsForSetMinPINLength"`

	// PreferredPlatformUvAttempts specifies the preferred number of UV attempts before falling back to PIN.
	PreferredPlatformUvAttempts uint `json:"preferredPlatformUvAttempts"`

	// UvModality specifies the user verification modality supported by the authenticator.
	UvModality uint `json:"uvModality"`

	// Certifications specifies a map of authenticator certifications.
	Certifications map[string]float64 `json:"certifications"`

	// RemainingDiscoverableCredentials indicates the estimated number of additional discoverable credentials that
	// can be stored.
	RemainingDiscoverableCredentials uint `json:"remainingDiscoverableCredentials"`

	// VendorPrototypeConfigCommands is a list of supported authenticatorConfig vendorCommandId values.
	VendorPrototypeConfigCommands []uint `json:"vendorPrototypeConfigCommands"`
}

func (j AuthenticatorGetInfoJSON) Parse() (info AuthenticatorGetInfo, err error) {
	var aaguid uuid.UUID

	if len(j.AaGUID) != 0 {
		if aaguid, err = uuid.Parse(j.AaGUID); err != nil {
			return info, fmt.Errorf("error occurred parsing AAGUID value: %w", err)
		}
	}

	return AuthenticatorGetInfo{
		Versions:                         j.Versions,
		Extensions:                       j.Extensions,
		AaGUID:                           aaguid,
		Options:                          j.Options,
		MaxMsgSize:                       j.MaxMsgSize,
		PivUvAuthProtocols:               j.PivUvAuthProtocols,
		MaxCredentialCountInList:         j.MaxCredentialCountInList,
		MaxCredentialIdLength:            j.MaxCredentialIdLength,
		Transports:                       j.Transports,
		Algorithms:                       j.Algorithms,
		MaxSerializedLargeBlobArray:      j.MaxSerializedLargeBlobArray,
		ForcePINChange:                   j.ForcePINChange,
		MinPINLength:                     j.MinPINLength,
		FirmwareVersion:                  j.FirmwareVersion,
		MaxCredBlobLength:                j.MaxCredBlobLength,
		MaxRPIDsForSetMinPINLength:       j.MaxRPIDsForSetMinPINLength,
		PreferredPlatformUvAttempts:      j.PreferredPlatformUvAttempts,
		UvModality:                       j.UvModality,
		Certifications:                   j.Certifications,
		RemainingDiscoverableCredentials: j.RemainingDiscoverableCredentials,
		VendorPrototypeConfigCommands:    j.VendorPrototypeConfigCommands,
	}, nil
}

// MDSGetEndpointsRequest is the request sent to the conformance metadata getEndpoints endpoint.
type MDSGetEndpointsRequest struct {
	// Endpoint is the URL of the local server endpoint, i.e. https://webauthn.io/
	Endpoint string `json:"endpoint"`
}

// MDSGetEndpointsResponse is the response received from a conformance metadata getEndpoints request.
type MDSGetEndpointsResponse struct {
	// Status is the status of the response.
	Status string `json:"status"`

	// Result is an array of urls, each pointing to a MetadataTOCPayload.
	Result []string `json:"result"`
}

// DefaultUndesiredAuthenticatorStatuses returns a copy of the defaultUndesiredAuthenticatorStatus slice.
func DefaultUndesiredAuthenticatorStatuses() []AuthenticatorStatus {
	undesired := make([]AuthenticatorStatus, len(defaultUndesiredAuthenticatorStatus))

	copy(undesired, defaultUndesiredAuthenticatorStatus[:])

	return undesired
}

// EntryError represents an [EntryJSON] that failed to parse, along with the error that occurred.
type EntryError struct {
	// Error is the parsing error that occurred.
	Error error

	// EntryJSON is the raw JSON entry that failed to parse.
	EntryJSON
}