package domain

import (
	"slices"
	"strings"
	"time"

	"golang.org/x/text/language"

	"github.com/zitadel/zitadel/internal/zerrors"
)

type AuthRequest struct {
	ID            string
	AgentID       string
	CreationDate  time.Time
	ChangeDate    time.Time
	BrowserInfo   *BrowserInfo
	ApplicationID string
	CallbackURI   string
	TransferState string
	Prompt        []Prompt
	PossibleLOAs  []LevelOfAssurance
	UiLocales     []string
	LoginHint     string
	MaxAuthAge    *time.Duration
	InstanceID    string
	Request       Request

	levelOfAssurance         LevelOfAssurance
	UserID                   string
	UserName                 string
	LoginName                string
	DisplayName              string
	AvatarKey                string
	PresignedAvatar          string
	UserOrgID                string
	PreferredLanguage        *language.Tag
	RequestedOrgID           string
	RequestedOrgName         string
	RequestedPrimaryDomain   string
	RequestedOrgDomain       bool
	ApplicationResourceOwner string
	PrivateLabelingSetting   PrivateLabelingSetting
	SelectedIDPConfigID      string
	LinkingUsers             []*ExternalUser
	PossibleSteps            []NextStep `json:"-"`
	PasswordVerified         bool
	IDPLoginChecked          bool
	MFAsVerified             []MFAType
	Audience                 []string
	AuthTime                 time.Time
	Code                     string
	LoginPolicy              *LoginPolicy
	AllowedExternalIDPs      []*IDPProvider
	LabelPolicy              *LabelPolicy
	PrivacyPolicy            *PrivacyPolicy
	LockoutPolicy            *LockoutPolicy
	PasswordAgePolicy        *PasswordAgePolicy
	DefaultTranslations      []*CustomText
	OrgTranslations          []*CustomText
	SAMLRequestID            string
	// orgID the policies were last loaded with
	policyOrgID string
	// SessionID is set to the computed sessionID of the login session table
	SessionID string
}

func (a *AuthRequest) SetPolicyOrgID(id string) {
	a.policyOrgID = id
}

func (a *AuthRequest) PolicyOrgID() string {
	return a.policyOrgID
}

func (a *AuthRequest) AuthMethods() []UserAuthMethodType {
	list := make([]UserAuthMethodType, 0, len(a.MFAsVerified)+2)
	if a.PasswordVerified {
		list = append(list, UserAuthMethodTypePassword)
	}
	if a.IDPLoginChecked {
		list = append(list, UserAuthMethodTypeIDP)
	}
	for _, mfa := range a.MFAsVerified {
		list = append(list, mfa.UserAuthMethodType())
	}
	return slices.Compact(list)
}

type ExternalUser struct {
	IDPConfigID       string
	ExternalUserID    string
	DisplayName       string
	PreferredUsername string
	FirstName         string
	LastName          string
	NickName          string
	Email             EmailAddress
	IsEmailVerified   bool
	PreferredLanguage language.Tag
	Phone             PhoneNumber
	IsPhoneVerified   bool
	Metadatas         []*Metadata
}

type Prompt int32

const (
	PromptUnspecified Prompt = iota
	PromptNone
	PromptLogin
	PromptConsent
	PromptSelectAccount
	PromptCreate
)

func IsPrompt(prompt []Prompt, requestedPrompt Prompt) bool {
	for _, p := range prompt {
		if p == requestedPrompt {
			return true
		}
	}
	return false
}

type LevelOfAssurance int

const (
	LevelOfAssuranceNone LevelOfAssurance = iota
)

type MFAType int

const (
	MFATypeTOTP MFAType = iota
	MFATypeU2F
	MFATypeU2FUserVerification
	MFATypeOTPSMS
	MFATypeOTPEmail
)

func (m MFAType) UserAuthMethodType() UserAuthMethodType {
	switch m {
	case MFATypeTOTP:
		return UserAuthMethodTypeTOTP
	case MFATypeU2F:
		return UserAuthMethodTypeU2F
	case MFATypeU2FUserVerification:
		return UserAuthMethodTypePasswordless
	case MFATypeOTPSMS:
		return UserAuthMethodTypeOTPSMS
	case MFATypeOTPEmail:
		return UserAuthMethodTypeOTPEmail
	default:
		return UserAuthMethodTypeUnspecified
	}
}

type MFALevel int

const (
	MFALevelNotSetUp MFALevel = iota
	MFALevelSecondFactor
	MFALevelMultiFactor
	MFALevelMultiFactorCertified
)

type AuthRequestState int

const (
	AuthRequestStateUnspecified AuthRequestState = iota
	AuthRequestStateAdded
	AuthRequestStateCodeAdded
	AuthRequestStateCodeExchanged
	AuthRequestStateFailed
	AuthRequestStateSucceeded
)

func NewAuthRequestFromType(requestType AuthRequestType) (*AuthRequest, error) {
	switch requestType {
	case AuthRequestTypeOIDC:
		return &AuthRequest{Request: &AuthRequestOIDC{}}, nil
	case AuthRequestTypeSAML:
		return &AuthRequest{Request: &AuthRequestSAML{}}, nil
	case AuthRequestTypeDevice:
		return &AuthRequest{Request: &AuthRequestDevice{}}, nil
	}
	return nil, zerrors.ThrowInvalidArgument(nil, "DOMAIN-ds2kl", "invalid request type")
}

func (a *AuthRequest) WithCurrentInfo(info *BrowserInfo) *AuthRequest {
	a.BrowserInfo = info
	return a
}

func (a *AuthRequest) SetUserInfo(userID, userName, loginName, displayName, avatar, userOrgID string) {
	a.UserID = userID
	a.UserName = userName
	a.LoginName = loginName
	a.DisplayName = displayName
	a.AvatarKey = avatar
	a.UserOrgID = userOrgID
}

func (a *AuthRequest) SetOrgInformation(id, name, primaryDomain string, requestedByDomain bool) {
	a.RequestedOrgID = id
	a.RequestedOrgName = name
	a.RequestedPrimaryDomain = primaryDomain
	a.RequestedOrgDomain = requestedByDomain
}

func (a *AuthRequest) MFALevel() MFALevel {
	return -1
	//PLANNED: check a.PossibleLOAs (and Prompt Login?)
}

func (a *AuthRequest) AppendAudIfNotExisting(aud string) {
	for _, a := range a.Audience {
		if a == aud {
			return
		}
	}
	a.Audience = append(a.Audience, aud)
}

func (a *AuthRequest) GetScopeOrgPrimaryDomain() string {
	switch request := a.Request.(type) {
	case *AuthRequestOIDC:
		for _, scope := range request.Scopes {
			if strings.HasPrefix(scope, OrgDomainPrimaryScope) {
				return strings.TrimPrefix(scope, OrgDomainPrimaryScope)
			}
		}
	}
	return ""
}

func (a *AuthRequest) GetScopeOrgID() string {
	switch request := a.Request.(type) {
	case *AuthRequestOIDC:
		for _, scope := range request.Scopes {
			if strings.HasPrefix(scope, OrgIDScope) {
				return strings.TrimPrefix(scope, OrgIDScope)
			}
		}
	}
	return ""
}

func (a *AuthRequest) Done() bool {
	for _, step := range a.PossibleSteps {
		if step.Type() == NextStepRedirectToCallback {
			return true
		}
	}
	return false
}

func (a *AuthRequest) PrivateLabelingOrgID(defaultID string) string {
	if a.RequestedOrgID != "" {
		return a.RequestedOrgID
	}
	if (a.PrivateLabelingSetting == PrivateLabelingSettingAllowLoginUserResourceOwnerPolicy || a.PrivateLabelingSetting == PrivateLabelingSettingUnspecified) &&
		a.UserOrgID != "" {
		return a.UserOrgID
	}
	if a.PrivateLabelingSetting != PrivateLabelingSettingUnspecified {
		return a.ApplicationResourceOwner
	}
	return defaultID
}

func (a *AuthRequest) UserAuthMethodTypes() []UserAuthMethodType {
	list := make([]UserAuthMethodType, 0, len(a.MFAsVerified)+1)
	if a.PasswordVerified {
		list = append(list, UserAuthMethodTypePassword)
	}
	for _, mfa := range a.MFAsVerified {
		list = append(list, mfa.UserAuthMethodType())
	}
	return list
}