package main

import (
	"database/sql"
	"fmt"
	"net/url"
	"regexp"
	"strconv"
	"strings"
	"time"

	"github.com/asaskevich/govalidator"
	"github.com/gin-gonic/gin"
	"zxq.co/ripple/rippleapi/common"
	"zxq.co/ripple/schiavolib"
)

func register(c *gin.Context) {
	if getContext(c).User.ID != 0 {
		resp403(c)
		return
	}
	if c.Query("stopsign") != "1" {
		u, _ := tryBotnets(c)
		if u != "" {
			simple(c, getSimpleByFilename("register/elmo.html"), nil, map[string]interface{}{
				"Username": u,
			})
			return
		}
	}
	registerResp(c)
}

func registerSubmit(c *gin.Context) {
	if getContext(c).User.ID != 0 {
		resp403(c)
		return
	}
	// check registrations are enabled
	if !registrationsEnabled() {
		registerResp(c, errorMessage{T(c, "Sorry, it's not possible to register at the moment. Please try again later.")})
		return
	}

	// check username is valid by our criteria
	username := strings.TrimSpace(c.PostForm("username"))
	if !usernameRegex.MatchString(username) {
		registerResp(c, errorMessage{T(c, "Your username must contain alphanumerical characters, spaces, or any of <code>_[]-</code>")})
		return
	}

	// check whether an username is e.g. cookiezi, shigetora, peppy, wubwoofwolf, loctav
	if in(strings.ToLower(username), forbiddenUsernames) {
		registerResp(c, errorMessage{T(c, "You're not allowed to register with that username.")})
		return
	}

	// check email is valid
	if !govalidator.IsEmail(c.PostForm("email")) {
		registerResp(c, errorMessage{T(c, "Please pass a valid email address.")})
		return
	}

	// passwords check (too short/too common)
	if x := validatePassword(c.PostForm("password")); x != "" {
		registerResp(c, errorMessage{T(c, x)})
		return
	}

	// usernames with both _ and spaces are not allowed
	if strings.Contains(username, "_") && strings.Contains(username, " ") {
		registerResp(c, errorMessage{T(c, "An username can't contain both underscores and spaces.")})
		return
	}

	// check whether username already exists
	if db.QueryRow("SELECT 1 FROM users WHERE username_safe = ?", safeUsername(username)).
		Scan(new(int)) != sql.ErrNoRows {
		registerResp(c, errorMessage{T(c, "An user with that username already exists!")})
		return
	}

	// check whether an user with that email already exists
	if db.QueryRow("SELECT 1 FROM users WHERE email = ?", c.PostForm("email")).
		Scan(new(int)) != sql.ErrNoRows {
		registerResp(c, errorMessage{T(c, "An user with that email address already exists!")})
		return
	}

	// recaptcha verify
	if config.RecaptchaPrivate != "" && !recaptchaCheck(c) {
		registerResp(c, errorMessage{T(c, "Captcha is invalid.")})
		return
	}
	
	uMulti, criteria := tryBotnets(c)
	if criteria != "" {
		schiavo.CMs.Send(
			fmt.Sprintf(
				"User **%s** registered with the same %s as %s (%s/u/%s). **POSSIBLE MULTIACCOUNT!!!**. Waiting for ingame verification...",
				username, criteria, uMulti, config.BaseURL, url.QueryEscape(uMulti),
			),
		)
	}

	// The actual registration.
	pass, err := generatePassword(c.PostForm("password"))
	if err != nil {
		resp500(c)
		return
	}

	res, err := db.Exec(`INSERT INTO users(username, username_safe, password_md5, salt, email, register_datetime, privileges, password_version)
							  VALUES (?,        ?,             ?,            '',   ?,     ?,                 ?,          2);`,
		username, safeUsername(username), pass, c.PostForm("email"), time.Now().Unix(), common.UserPrivilegePendingVerification)
	if err != nil {
		registerResp(c, errorMessage{T(c, "Whoops, an error slipped in. You might have been registered, though. I don't know.")})
		return
	}
	lid, _ := res.LastInsertId()

	db.Exec("INSERT INTO `users_stats`(id, username, user_color, user_style, ranked_score_std, playcount_std, total_score_std, ranked_score_taiko, playcount_taiko, total_score_taiko, ranked_score_ctb, playcount_ctb, total_score_ctb, ranked_score_mania, playcount_mania, total_score_mania) VALUES (?, ?, 'black', '', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);", lid, username)

	schiavo.CMs.Send(fmt.Sprintf("User (**%s** | %s) registered from %s", username, c.PostForm("email"), clientIP(c)))

	setYCookie(int(lid), c)
	logIP(c, int(lid))

	rd.Incr("ripple:registered_users")

	addMessage(c, successMessage{T(c, "You have been successfully registered on Yozora! You now need to verify your account.")})
	getSession(c).Save()
	c.Redirect(302, "/register/verify?u="+strconv.Itoa(int(lid)))
}

func registerResp(c *gin.Context, messages ...message) {
	resp(c, 200, "register/register.html", &baseTemplateData{
		TitleBar:  "Register",
		KyutGrill: "register.jpg",
		Scripts:   []string{"https://www.google.com/recaptcha/api.js"},
		Messages:  messages,
		FormData:  normaliseURLValues(c.Request.PostForm),
	})
}

func registrationsEnabled() bool {
	var enabled bool
	db.QueryRow("SELECT value_int FROM system_settings WHERE name = 'registrations_enabled'").Scan(&enabled)
	return enabled
}

func verifyAccount(c *gin.Context) {
	if getContext(c).User.ID != 0 {
		resp403(c)
		return
	}

	i, ret := checkUInQS(c)
	if ret {
		return
	}

	sess := getSession(c)
	var rPrivileges uint64
	db.Get(&rPrivileges, "SELECT privileges FROM users WHERE id = ?", i)
	if common.UserPrivileges(rPrivileges)&common.UserPrivilegePendingVerification == 0 {
		addMessage(c, warningMessage{T(c, "Nope.")})
		sess.Save()
		c.Redirect(302, "/")
		return
	}

	resp(c, 200, "register/verify.html", &baseTemplateData{
		TitleBar:       "Verify account",
		HeadingOnRight: true,
		KyutGrill:      "welcome.jpg",
	})
}

func welcome(c *gin.Context) {
	if getContext(c).User.ID != 0 {
		resp403(c)
		return
	}

	i, ret := checkUInQS(c)
	if ret {
		return
	}

	var rPrivileges uint64
	db.Get(&rPrivileges, "SELECT privileges FROM users WHERE id = ?", i)
	if common.UserPrivileges(rPrivileges)&common.UserPrivilegePendingVerification > 0 {
		c.Redirect(302, "/register/verify?u="+c.Query("u"))
		return
	}

	t := T(c, "Welcome!")
	if common.UserPrivileges(rPrivileges)&common.UserPrivilegeNormal == 0 {
		// if the user has no UserNormal, it means they're banned = they multiaccounted
		t = T(c, "Welcome back!")
	}

	resp(c, 200, "register/welcome.html", &baseTemplateData{
		TitleBar:       t,
		HeadingOnRight: true,
		KyutGrill:      "welcome.jpg",
	})
}

// Check User In Query Is Same As User In Y Cookie
func checkUInQS(c *gin.Context) (int, bool) {
	sess := getSession(c)

	i, _ := strconv.Atoi(c.Query("u"))
	y, _ := c.Cookie("y")
	err := db.QueryRow("SELECT 1 FROM identity_tokens WHERE token = ? AND userid = ?", y, i).Scan(new(int))
	if err == sql.ErrNoRows {
		addMessage(c, warningMessage{T(c, "Nope.")})
		sess.Save()
		c.Redirect(302, "/")
		return 0, true
	}
	return i, false
}

func tryBotnets(c *gin.Context) (string, string) {
	var username string

	err := db.QueryRow("SELECT u.username FROM ip_user i INNER JOIN users u ON u.id = i.userid WHERE i.ip = ?", clientIP(c)).Scan(&username)
	if err != nil {
		if err != sql.ErrNoRows {
			c.Error(err)
		}
		return "", ""
	}
	if username != "" {
		return username, "IP"
	}

	cook, _ := c.Cookie("y")
	err = db.QueryRow("SELECT u.username FROM identity_tokens i INNER JOIN users u ON u.id = i.userid WHERE i.token = ?",
		cook).Scan(&username)
	if err != nil {
		if err != sql.ErrNoRows {
			c.Error(err)
		}
		return "", ""
	}
	if username != "" {
		return username, "username"
	}

	return "", ""
}

func in(s string, ss []string) bool {
	for _, x := range ss {
		if x == s {
			return true
		}
	}
	return false
}

var usernameRegex = regexp.MustCompile(`^[A-Za-z0-9 _\[\]-]{2,15}$`)
var forbiddenUsernames = []string{
	"peppy",
	"rrtyui",
	"cookiezi",
	"azer",
	"loctav",
	"banchobot",
	"happystick",
	"doomsday",
	"sharingan33",
	"andrea",
	"cptnxn",
	"reimu-desu",
	"hvick225",
	"_index",
	"my aim sucks",
	"kynan",
	"rafis",
	"sayonara-bye",
	"thelewa",
	"wubwoofwolf",
	"millhioref",
	"tom94",
	"tillerino",
	"clsw",
	"spectator",
	"exgon",
	"axarious",
	"angelsim",
	"recia",
	"nara",
	"emperorpenguin83",
	"bikko",
	"xilver",
	"vettel",
	"kuu01",
	"_yu68",
	"tasuke912",
	"dusk",
	"ttobas",
	"velperk",
	"jakads",
	"jhlee0133",
	"abcdullah",
	"yuko-",
	"entozer",
	"hdhr",
	"ekoro",
	"snowwhite",
	"osuplayer111",
	"musty",
	"nero",
	"elysion",
	"ztrot",
	"koreapenguin",
	"fort",
	"asphyxia",
	"niko",
	"shigetora",
}