// mautrix-discord - A Matrix-Discord puppeting bridge.
// Copyright 2015-2016 Bruce Marriner <bruce@sqls.net>.  All rights reserved.
// Copyright (C) 2026 The mautrix-discord contributors
//
// This file is derived from discordgo (https://github.com/bwmarrin/discordgo),
// used under the BSD-3-Clause license; see README.md in this directory. This
// file is distributed under the GNU AGPLv3 as follows:
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

package meowcord

import (
	"strconv"
)

// UserFlags is the flags of "user" (see UserFlags* consts)
// https://discord.com/developers/docs/resources/user#user-object-user-flags
type UserFlags uint64

// Valid UserFlags values
//
// https://docs.discord.food/resources/user#user-flags
const (
	UserFlagDiscordEmployee UserFlags = 1 << iota
	UserFlagDiscordPartner
	UserFlagHypeSquadEvents
	UserFlagBugHunterLevel1
	UserFlagMFASMS                // private
	UserFlagPremiumPromoDismissed // private
	UserFlagHouseBravery
	UserFlagHouseBrilliance
	UserFlagHouseBalance
	UserFlagEarlySupporter
	UserFlagTeamUser
	UserFlagIsHubspotContact        // private, harvested
	UserFlagSystem                  // legacy
	UserFlagHasUnreadUrgentMessages // private
	UserFlagBugHunterLevel2
	UserFlagUnderageDeleted // private, harvested
	UserFlagVerifiedBot
	UserFlagVerifiedBotDeveloper
	UserFlagDiscordCertifiedModerator
	UserFlagBotHTTPInteractions
	UserFlagSpammer
	UserFlagDisablePremium     // private, legacy
	UserFlagActiveBotDeveloper // legacy
	UserFlagProvisionalAccount
)

// (9 bits, 24 through 32, are unknown)

const (
	UserFlagHighGlobalRatelimit        UserFlags = 1 << (iota + 33) // private, harvested
	UserFlagDeleted                                                 // private, harvested
	UserFlagDisabledSuspiciousActivity                              // private, harvested
	UserFlagSelfDeleted                                             // private, harvested
	UserFlagPremiumDiscriminator                                    // private, harvested
	UserFlagUsedDesktopClient                                       // private, harvested
	UserFlagUsedWebClient                                           // private, harvested
	UserFlagUsedMobileClient                                        // private, harvested
	UserFlagDisabled                                                // private, harvested
)

// (bit 42 is unknown)

const (
	UserFlagHasSessionStarted UserFlags = 1 << (iota + 43)
	UserFlagQuarantined                 // private
)

// (bits 45 and 46 are unknown)

const (
	UserFlagPremiumEligibleForUniqueUsername UserFlags = 1 << (iota + 47)
)

// (bits 48 and 49 are unknown)

const (
	UserFlagCollaborator UserFlags = 1 << (iota + 50)
	UserFlagRestrictedCollaborator
)

// UserPremiumType is the type of premium (nitro) subscription a user has (see UserPremiumType* consts).
// https://discord.com/developers/docs/resources/user#user-object-premium-types
type UserPremiumType int

// Valid UserPremiumType values.
const (
	UserPremiumTypeNone         UserPremiumType = 0
	UserPremiumTypeNitroClassic UserPremiumType = 1
	UserPremiumTypeNitro        UserPremiumType = 2
	UserPremiumTypeNitroBasic   UserPremiumType = 3
)

// UserPrimaryGuild represents a user's primary guild information.
type UserPrimaryGuild struct {
	// The ID of the user's primary guild.
	IdentityGuildID string `json:"identity_guild_id"`

	// Whether the user is displaying the primary guild's server tag.
	IdentityEnabled bool `json:"identity_enabled"`

	// The server tag of the user's primary guild. Limited to 4 characters
	Tag string `json:"tag"`

	// The server tag badge hash
	// https://discord.com/developers/docs/reference#image-formatting
	Badge string `json:"badge"`
}

// 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"`

	Phone string `json:"phone"`

	// 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 user's display name, if it is set.
	// For bots, this is the application name.
	GlobalName string `json:"global_name"`

	// 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"`

	// The hash of the user's banner image.
	Banner string `json:"banner"`

	// User's banner color, encoded as an integer representation of hexadecimal color code
	AccentColor int `json:"accent_color"`

	// 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 UserPremiumType `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 UserFlags `json:"flags"`

	// The user's primary guild.
	PrimaryGuild UserPrimaryGuild `json:"primary_guild"`
}

// String returns a unique identifier of the form username#discriminator
// or just username, if the discriminator is set to "0".
func (u *User) String() string {
	// If the user has been migrated from the legacy username system, their discriminator is "0".
	// See https://support-dev.discord.com/hc/en-us/articles/13667755828631
	if u.Discriminator == "0" {
		return u.Username
	}

	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 {
	return avatarURL(
		u.Avatar,
		EndpointDefaultUserAvatar(u.DefaultAvatarIndex()),
		EndpointUserAvatar(u.ID, u.Avatar),
		EndpointUserAvatarAnimated(u.ID, u.Avatar),
		size,
	)
}

// BannerURL returns the URL of the users's banner image.
//
//	size:    The size of the desired banner image as a power of two
//	         Image size can be any power of two between 16 and 4096.
func (u *User) BannerURL(size string) string {
	return bannerURL(u.Banner, EndpointUserBanner(u.ID, u.Banner), EndpointUserBannerAnimated(u.ID, u.Banner), size)
}

// DefaultAvatarIndex returns the index of the user's default avatar.
func (u *User) DefaultAvatarIndex() int {
	if u.Discriminator == "0" {
		id, _ := strconv.ParseUint(u.ID, 10, 64)
		return int((id >> 22) % 6)
	}

	id, _ := strconv.Atoi(u.Discriminator)
	return id % 5
}

// DisplayName returns the user's global name if they have one, otherwise it returns their username.
func (u *User) DisplayName() string {
	if u.GlobalName != "" {
		return u.GlobalName
	}
	return u.Username
}