// libnmdc project UserInfo.go
package libnmdc

import (
	"errors"
	"fmt"
	"regexp"
	"strconv"
	"strings"
)

type UserFlag byte

const (
	FLAG_NORMAL          UserFlag = 1
	FLAG_AWAY_1          UserFlag = 2
	FLAG_AWAY_2          UserFlag = 3
	FLAG_SERVER_1        UserFlag = 4
	FLAG_SERVER_2        UserFlag = 5
	FLAG_SERVER_AWAY_1   UserFlag = 6
	FLAG_SERVER_AWAY_2   UserFlag = 7
	FLAG_FIREBALL_1      UserFlag = 8
	FLAG_FIREBALL_2      UserFlag = 9
	FLAG_FIREBALL_AWAY_1 UserFlag = 10
	FLAG_FIREBALL_AWAY_2 UserFlag = 11
)

type ConnectionMode rune

const (
	CONNECTIONMODE_ACTIVE  ConnectionMode = 'A'
	CONNECTIONMODE_PASSIVE ConnectionMode = 'P'
	CONNECTIONMODE_SOCKS5  ConnectionMode = '5'
)

// This structure represents a user connected to a hub.
type UserInfo struct {
	Nick             string
	Description      string
	ClientTag        string
	ClientVersion    string
	Email            string
	ShareSize        uint64
	ConnectionMode   ConnectionMode
	Flag             UserFlag
	Slots            uint64
	Speed            string
	HubsUnregistered uint64
	HubsRegistered   uint64
	HubsOperator     uint64
	IsOperator       bool
}

var rx_myinfo *regexp.Regexp
var rx_myinfo_notag *regexp.Regexp

func init() {
	// $ALL <nick> <description>$ $<connection><flag>$<e-mail>$<sharesize>$
	rx_myinfo = regexp.MustCompile("(?ms)^\\$ALL ([^ ]+) ([^<]*)<([^,]*)V:([^,]+),M:(.),H:([0-9]+)/([0-9]+)/([0-9]+),S:([0-9]+)>\\$.\\$(.+?)(.)\\$([^$]*)\\$([0-9]*)\\$$")
	rx_myinfo_notag = regexp.MustCompile("(?ms)^\\$ALL ([^ ]+) ([^$]*)\\$.\\$(.*)(.)\\$([^$]*)\\$([0-9]*)\\$$") // Fallback for no tag

	/*
		sample := "$ALL Betty description<ApexDC++ V:1.4.3,M:P,H:9/0/2,S:1>$ $0.01\x01$xyz@xyz.com$53054999578$"
		sample = "$ALL ivysaur80 $P$10A$$0$"

		u := UserInfo{}
		err := u.fromMyINFO(sample)
		if err != nil {
			fmt.Println(err.Error())
		} else {
			fmt.Printf("%+v\n", u)
		}

		os.Exit(1)
	*/
}

func NewUserInfo(username string) *UserInfo {
	return &UserInfo{
		Nick:             username,
		ConnectionMode:   CONNECTIONMODE_PASSIVE,
		HubsUnregistered: 1,
	}
}

func maybeParse(str string, dest *uint64, default_val uint64) {
	sz, err := strconv.ParseUint(str, 10, 64)
	if err == nil {
		*dest = sz
	} else {
		*dest = default_val
	}
}

func (this *UserInfo) fromMyINFO(protomsg string) error {
	// Normal format (with tag in exact V/M/H/S order)
	matches := rx_myinfo.FindStringSubmatch(protomsg)
	if matches != nil {
		this.Nick = matches[1]
		this.Description = NMDCUnescape(matches[2])
		this.ClientTag = NMDCUnescape(matches[3])
		this.ClientVersion = matches[4]
		this.ConnectionMode = ConnectionMode(matches[4][0])
		maybeParse(matches[6], &this.HubsUnregistered, 0)
		maybeParse(matches[7], &this.HubsRegistered, 0)
		maybeParse(matches[8], &this.HubsOperator, 0)
		maybeParse(matches[9], &this.Slots, 0)
		this.Speed = matches[10]
		this.Flag = UserFlag(matches[11][0])
		this.Email = NMDCUnescape(matches[12])
		maybeParse(matches[13], &this.ShareSize, 0)

		return nil
	}

	// No-tag format, used in early connection
	matches = rx_myinfo_notag.FindStringSubmatch(protomsg)
	if matches != nil {
		this.Nick = matches[1]
		this.Description = NMDCUnescape(matches[2])
		this.ClientTag = ""
		this.ClientVersion = "0"
		this.ConnectionMode = CONNECTIONMODE_PASSIVE
		this.HubsUnregistered = 0
		this.HubsRegistered = 0
		this.HubsOperator = 0
		this.Slots = 0
		this.Speed = matches[3]
		this.Flag = UserFlag(matches[4][0])
		this.Email = NMDCUnescape(matches[5])
		maybeParse(matches[6], &this.ShareSize, 0)

		return nil
	}

	// Couldn't get anything out of it...
	return errors.New("Malformed MyINFO")
}

// Returns the MyINFO command, WITH leading $MyINFO, and WITHOUT trailing pipe
func (this *UserInfo) toMyINFO() string {
	return fmt.Sprintf(
		"$MyINFO $ALL %s %s<%s V:%s,M:%c,H:%d/%d/%d,S:%d>$ $%s%c$%s$%d$",
		this.Nick,
		this.Description,
		this.ClientTag,
		strings.Replace(this.ClientVersion, ",", "-", -1), // just in case
		this.ConnectionMode,
		this.HubsUnregistered,
		this.HubsRegistered,
		this.HubsOperator,
		this.Slots,
		this.Speed,
		this.Flag,
		this.Email,
		this.ShareSize,
	)
}