package models

import (
	"database/sql"
	"time"

	"gorm.io/gen"
	"gorm.io/gorm"

	"git.mstar.dev/mstar/linstrom/config"
)

// A user describes an account for creating content and events.
// This may be controlled by either a human or some external script
//
// Data stored externally:
// - Feed connections (which note belongs in the feed of this user, for what reason), see [NoteToFeed]
type User struct {
	// ID is a uuid for this account
	//
	// NOTE: Performance and storage wise, using a UUID (as string) for the primary key
	// is not the best idea and it would be better to use incrementing integers
	// Additionally, there is a risk with inconsistency if postgres crashes during a commit
	// in which case the new entry might not have a valid Id with which it could be found
	// and the username is lost until manual recovery
	// However, a UUID is still necessary in some way to provide a (secondary) stable
	// identifier for users and other servers, especially when changing the username
	// (username != display name) might be a future feature
	// Same also applies for other types that use a UUID as primary key
	ID string `gorm:"primarykey;type:uuid;default:gen_random_uuid()"`
	// Username of the user (eg "max" if the full username is @max@example.com)
	// Assume unchangable (once set by a user) to be kind to other implementations
	// Would be an easy avenue to fuck with them though
	Username  string    `gorm:"unique"`
	CreatedAt time.Time // When this entry was created. Automatically set by gorm
	// When this account was last updated. Will also be used for refreshing remote accounts. Automatically set by gorm
	UpdatedAt time.Time
	// When this entry was deleted (for soft deletions)
	// Soft delete means that this entry still exists in the db, but gorm won't include it anymore unless specifically told to
	// If not null, this entry is marked as deleted
	DeletedAt    gorm.DeletedAt `gorm:"index"`
	Server       RemoteServer
	ServerId     uint   // Id of the server this user is from, needed for including RemoteServer
	DisplayName  string // The display name of the user. Can be different from the handle
	Description  string // The description of a user account
	IsBot        bool   // Whether to mark this account as a script controlled one
	Icon         MediaMetadata
	IconId       string // ID of a media file used as icon
	Background   *MediaMetadata
	BackgroundId sql.NullString // ID of a media file used as background image
	Banner       *MediaMetadata
	BannerId     sql.NullString // ID of a media file used as banner
	Indexable    bool           // Whether this account can be found by crawlers
	PublicKey    []byte         // The public key of the account
	// Whether this account restricts following
	// If true, the owner must approve of a follow request first
	RestrictedFollow bool

	Location sql.NullString
	Birthday sql.NullTime

	// Whether the account got verified and is allowed to be active
	// For local accounts being active means being allowed to login and perform interactions
	// For remote users, if an account is not verified, any interactions it sends are discarded
	Verified bool
	// 64 byte unique id for passkeys, because UUIDs are 128 bytes and passkey spec says 64 bytes max
	// In theory, could also slash Id in half, but that would be a lot more calculations than the
	// saved space is worth
	PasskeyId            []byte
	FinishedRegistration bool // Whether this account has completed registration yet

	// ---- "Remote" linked values
	InfoFields  []UserInfoField
	BeingTypes  []UserToBeing
	Tags        []UserToTag
	Relations   []UserToUserRelation
	Pronouns    []UserToPronoun
	Roles       []UserToRole
	RemoteInfo  *UserRemoteLinks
	AuthMethods []UserAuthMethod
}

func BuildLinstromUser() *User {
	server := BuildDefaultServer()
	return &User{
		ID:           "e3f4bb33-6d39-4349-b13e-f5c6fde56141",
		Username:     "linstrom",
		Server:       *server,
		ServerId:     server.ID,
		DisplayName:  config.GlobalConfig.Self.ServerActorDisplayName,
		Description:  "The default linstrom server user",
		IsBot:        true,
		Icon:         DefaultDuckMedia,
		IconId:       DefaultDuckMedia.ID,
		Background:   nil,
		BackgroundId: sql.NullString{Valid: false},
		Banner:       nil,
		BannerId:     sql.NullString{Valid: false},
	}
}

type IUser interface {
	// Get a user by a username
	//
	// SELECT * FROM @@table WHERE username = @username LIMIT 1
	GetByUsername(username string) (*gen.T, error)
}