package discordgo

import "strings"

// UserFlags is the flags of "user" (see UserFlags* consts)
// https://discord.com/developers/docs/resources/user#user-object-user-flags
type UserFlags int

// Valid UserFlags values
const (
	UserFlagDiscordEmployee      UserFlags = 1 << 0
	UserFlagDiscordPartner                 = 1 << 1
	UserFlagHypeSquadEvents                = 1 << 2
	UserFlagBugHunterLevel1                = 1 << 3
	UserFlagHouseBravery                   = 1 << 6
	UserFlagHouseBrilliance                = 1 << 7
	UserFlagHouseBalance                   = 1 << 8
	UserFlagEarlySupporter                 = 1 << 9
	UserFlagTeamUser                       = 1 << 10
	UserFlagSystem                         = 1 << 12
	UserFlagBugHunterLevel2                = 1 << 14
	UserFlagVerifiedBot                    = 1 << 16
	UserFlagVerifiedBotDeveloper           = 1 << 17
)

// A User stores all data for an individual Discord user.
type User struct {
	// The ID of the user.
	ID string `json:"id"`

	// The email of the user. This is only present when
	// the application possesses the email scope for the user.
	Email string `json:"email"`

	// The user's username.
	Username string `json:"username"`

	// The hash of the user's avatar. Use Session.UserAvatar
	// to retrieve the avatar itself.
	Avatar string `json:"avatar"`

	// The user's chosen language option.
	Locale string `json:"locale"`

	// The discriminator of the user (4 numbers after name).
	Discriminator string `json:"discriminator"`

	// The token of the user. This is only present for
	// the user represented by the current session.
	Token string `json:"token"`

	// Whether the user's email is verified.
	Verified bool `json:"verified"`

	// Whether the user has multi-factor authentication enabled.
	MFAEnabled bool `json:"mfa_enabled"`

	// Whether the user is a bot.
	Bot bool `json:"bot"`

	// The public flags on a user's account.
	// This is a combination of bit masks; the presence of a certain flag can
	// be checked by performing a bitwise AND between this int and the flag.
	PublicFlags UserFlags `json:"public_flags"`

	// The type of Nitro subscription on a user's account.
	// Only available when the request is authorized via a Bearer token.
	PremiumType int `json:"premium_type"`

	// Whether the user is an Official Discord System user (part of the urgent message system).
	System bool `json:"system"`

	// The flags on a user's account.
	// Only available when the request is authorized via a Bearer token.
	Flags int `json:"flags"`
}

// String returns a unique identifier of the form username#discriminator
func (u *User) String() string {
	return u.Username + "#" + u.Discriminator
}

// Mention return a string which mentions the user
func (u *User) Mention() string {
	return "<@" + u.ID + ">"
}

// AvatarURL returns a URL to the user's avatar.
//    size:    The size of the user's avatar as a power of two
//             if size is an empty string, no size parameter will
//             be added to the URL.
func (u *User) AvatarURL(size string) string {
	var URL string
	if u.Avatar == "" {
		URL = EndpointDefaultUserAvatar(u.Discriminator)
	} else if strings.HasPrefix(u.Avatar, "a_") {
		URL = EndpointUserAvatarAnimated(u.ID, u.Avatar)
	} else {
		URL = EndpointUserAvatar(u.ID, u.Avatar)
	}

	if size != "" {
		return URL + "?size=" + size
	}
	return URL
}