package user

import (
	"fmt"
	"time"

	"github.com/grafana/grafana/pkg/models/roletype"
	"github.com/grafana/grafana/pkg/services/auth/identity"
)

type SignedInUser struct {
	UserID           int64 `xorm:"user_id"`
	OrgID            int64 `xorm:"org_id"`
	OrgName          string
	OrgRole          roletype.RoleType
	Login            string
	Name             string
	Email            string
	AuthenticatedBy  string
	ApiKeyID         int64 `xorm:"api_key_id"`
	IsServiceAccount bool  `xorm:"is_service_account"`
	IsGrafanaAdmin   bool
	IsAnonymous      bool
	IsDisabled       bool
	HelpFlags1       HelpFlags1
	LastSeenAt       time.Time
	Teams            []int64
	// Permissions grouped by orgID and actions
	Permissions map[int64]map[string][]string `json:"-"`
	// IDToken is a signed token representing the identity that can be forwarded to plugins and external services.
	// Will only be set when featuremgmt.FlagIdForwarding is enabled.
	IDToken string `json:"-" xorm:"-"`
}

func (u *SignedInUser) ShouldUpdateLastSeenAt() bool {
	return u.UserID > 0 && time.Since(u.LastSeenAt) > time.Minute*5
}

func (u *SignedInUser) NameOrFallback() string {
	if u.Name != "" {
		return u.Name
	}
	if u.Login != "" {
		return u.Login
	}
	return u.Email
}

// TODO: There's a need to remove this struct since it creates a circular dependency

// DEPRECATED: This function uses `UserDisplayDTO` model which we want to remove
// In order to retrieve the user URL, we need the dto library. However, adding
// the dto library to the user service creates a circular dependency
func (u *SignedInUser) ToUserDisplayDTO() *UserDisplayDTO {
	return &UserDisplayDTO{
		ID:    u.UserID,
		Login: u.Login,
		Name:  u.Name,
		// AvatarURL: dtos.GetGravatarUrl(u.GetEmail()),
	}
}

// Static function to parse a requester into a UserDisplayDTO
func NewUserDisplayDTOFromRequester(requester identity.Requester) (*UserDisplayDTO, error) {
	userID := int64(0)
	namespaceID, identifier := requester.GetNamespacedID()
	if namespaceID == identity.NamespaceUser || namespaceID == identity.NamespaceServiceAccount {
		userID, _ = identity.IntIdentifier(namespaceID, identifier)
	}

	return &UserDisplayDTO{
		ID:    userID,
		Login: requester.GetLogin(),
		Name:  requester.GetDisplayName(),
	}, nil
}

func (u *SignedInUser) HasRole(role roletype.RoleType) bool {
	if u.IsGrafanaAdmin {
		return true
	}

	return u.OrgRole.Includes(role)
}

// IsRealUser returns true if the entity is a real user and not a service account
func (u *SignedInUser) IsRealUser() bool {
	// backwards compatibility
	// checking if userId the user is a real user
	// previously we used to check if the UserId was 0 or -1
	// and not a service account
	return u.UserID > 0 && !u.IsServiceAccountUser()
}

func (u *SignedInUser) IsApiKeyUser() bool {
	return u.ApiKeyID > 0
}

// IsServiceAccountUser returns true if the entity is a service account
func (u *SignedInUser) IsServiceAccountUser() bool {
	return u.IsServiceAccount
}

// HasUniqueId returns true if the entity has a unique id
func (u *SignedInUser) HasUniqueId() bool {
	return u.IsRealUser() || u.IsApiKeyUser() || u.IsServiceAccountUser()
}

// GetCacheKey returns a unique key for the entity.
// Add an extra prefix to avoid collisions with other caches
func (u *SignedInUser) GetCacheKey() string {
	namespace, id := u.GetNamespacedID()
	if !u.HasUniqueId() {
		// Hack use the org role as id for identities that do not have a unique id
		// e.g. anonymous and render key.
		id = string(u.GetOrgRole())
	}

	return fmt.Sprintf("%d-%s-%s", u.GetOrgID(), namespace, id)
}

// GetIsGrafanaAdmin returns true if the user is a server admin
func (u *SignedInUser) GetIsGrafanaAdmin() bool {
	return u.IsGrafanaAdmin
}

// GetLogin returns the login of the active entity
// Can be empty if the user is anonymous
func (u *SignedInUser) GetLogin() string {
	return u.Login
}

// GetOrgID returns the ID of the active organization
func (u *SignedInUser) GetOrgID() int64 {
	return u.OrgID
}

// DEPRECATED: GetOrgName returns the name of the active organization
// Retrieve the organization name from the organization service instead of using this method.
func (u *SignedInUser) GetOrgName() string {
	return u.OrgName
}

// GetPermissions returns the permissions of the active entity
func (u *SignedInUser) GetPermissions() map[string][]string {
	if u.Permissions == nil {
		return make(map[string][]string)
	}

	if u.Permissions[u.GetOrgID()] == nil {
		return make(map[string][]string)
	}

	return u.Permissions[u.GetOrgID()]
}

// DEPRECATED: GetTeams returns the teams the entity is a member of
// Retrieve the teams from the team service instead of using this method.
func (u *SignedInUser) GetTeams() []int64 {
	return u.Teams
}

// GetOrgRole returns the role of the active entity in the active organization
func (u *SignedInUser) GetOrgRole() roletype.RoleType {
	if u.OrgRole == "" {
		return roletype.RoleNone
	}
	return u.OrgRole
}

// GetNamespacedID returns the namespace and ID of the active entity
// The namespace is one of the constants defined in pkg/services/auth/identity
func (u *SignedInUser) GetNamespacedID() (string, string) {
	switch {
	case u.ApiKeyID != 0:
		return identity.NamespaceAPIKey, fmt.Sprintf("%d", u.ApiKeyID)
	case u.IsServiceAccount:
		return identity.NamespaceServiceAccount, fmt.Sprintf("%d", u.UserID)
	case u.UserID > 0:
		return identity.NamespaceUser, fmt.Sprintf("%d", u.UserID)
	case u.IsAnonymous:
		return identity.NamespaceAnonymous, ""
	case u.AuthenticatedBy == "render": //import cycle render
		if u.UserID == 0 {
			return identity.NamespaceRenderService, "0"
		} else { // this should never happen as u.UserID > 0 already catches this
			return identity.NamespaceUser, fmt.Sprintf("%d", u.UserID)
		}
	}

	// backwards compatibility
	return identity.NamespaceUser, fmt.Sprintf("%d", u.UserID)
}

// FIXME: remove this method once all services are using an interface
func (u *SignedInUser) IsNil() bool {
	return u == nil
}

// GetEmail returns the email of the active entity
// Can be empty.
func (u *SignedInUser) GetEmail() string {
	return u.Email
}

// GetDisplayName returns the display name of the active entity
// The display name is the name if it is set, otherwise the login or email
func (u *SignedInUser) GetDisplayName() string {
	return u.NameOrFallback()
}

// DEPRECATEAD: Returns the authentication method used
func (u *SignedInUser) GetAuthenticatedBy() string {
	return u.AuthenticatedBy
}

func (u *SignedInUser) GetIDToken() string {
	return u.IDToken
}