package gocq

import (
	"bufio"
	"bytes"
	"encoding/hex"
	"fmt"
	"image"
	"image/png"
	"net/http"
	"os"
	"strings"
	"time"

	"github.com/Mrs4s/MiraiGo/client"
	"github.com/Mrs4s/MiraiGo/utils"
	"github.com/Mrs4s/MiraiGo/wrapper"
	"github.com/Mrs4s/go-cqhttp/internal/encryption"
	_ "github.com/Mrs4s/go-cqhttp/internal/encryption/t544"
	"github.com/mattn/go-colorable"
	"github.com/pkg/errors"
	log "github.com/sirupsen/logrus"
	"github.com/tidwall/gjson"
	"gopkg.ilharper.com/x/isatty"

	"github.com/Mrs4s/go-cqhttp/internal/base"

	"github.com/Mrs4s/go-cqhttp/global"
	"github.com/Mrs4s/go-cqhttp/internal/download"
)

var console = bufio.NewReader(os.Stdin)

func init() {
	wrapper.DandelionEnergy = energy
}

func readLine() (str string) {
	str, _ = console.ReadString('\n')
	str = strings.TrimSpace(str)
	return
}

func readLineTimeout(t time.Duration) {
	r := make(chan string)
	go func() {
		select {
		case r <- readLine():
		case <-time.After(t):
		}
	}()
	select {
	case <-r:
	case <-time.After(t):
	}
}

func readIfTTY(de string) (str string) {
	if isatty.Isatty(os.Stdin.Fd()) {
		return readLine()
	}
	log.Warnf("未检测到输入终端，自动选择%s.", de)
	return de
}

var cli *client.QQClient
var device *client.DeviceInfo

// ErrSMSRequestError SMS请求出错
var ErrSMSRequestError = errors.New("sms request error")

func commonLogin() error {
	res, err := cli.Login()
	if err != nil {
		return err
	}
	return loginResponseProcessor(res)
}

func printQRCode(imgData []byte) {
	const (
		black = "\033[48;5;0m  \033[0m"
		white = "\033[48;5;7m  \033[0m"
	)
	img, err := png.Decode(bytes.NewReader(imgData))
	if err != nil {
		log.Panic(err)
	}
	data := img.(*image.Gray).Pix
	bound := img.Bounds().Max.X
	buf := make([]byte, 0, (bound*4+1)*(bound))
	i := 0
	for y := 0; y < bound; y++ {
		i = y * bound
		for x := 0; x < bound; x++ {
			if data[i] != 255 {
				buf = append(buf, white...)
			} else {
				buf = append(buf, black...)
			}
			i++
		}
		buf = append(buf, '\n')
	}
	_, _ = colorable.NewColorableStdout().Write(buf)
}

func qrcodeLogin() error {
	rsp, err := cli.FetchQRCodeCustomSize(1, 2, 1)
	if err != nil {
		return err
	}
	_ = os.WriteFile("qrcode.png", rsp.ImageData, 0o644)
	defer func() { _ = os.Remove("qrcode.png") }()
	if cli.Uin != 0 {
		log.Infof("请使用账号 %v 登录手机QQ扫描二维码 (qrcode.png) : ", cli.Uin)
	} else {
		log.Infof("请使用手机QQ扫描二维码 (qrcode.png) : ")
	}
	time.Sleep(time.Second)
	printQRCode(rsp.ImageData)
	s, err := cli.QueryQRCodeStatus(rsp.Sig)
	if err != nil {
		return err
	}
	prevState := s.State
	for {
		time.Sleep(time.Second)
		s, _ = cli.QueryQRCodeStatus(rsp.Sig)
		if s == nil {
			continue
		}
		if prevState == s.State {
			continue
		}
		prevState = s.State
		switch s.State {
		case client.QRCodeCanceled:
			log.Fatalf("扫码被用户取消.")
		case client.QRCodeTimeout:
			log.Fatalf("二维码过期")
		case client.QRCodeWaitingForConfirm:
			log.Infof("扫码成功, 请在手机端确认登录.")
		case client.QRCodeConfirmed:
			res, err := cli.QRCodeLogin(s.LoginInfo)
			if err != nil {
				return err
			}
			return loginResponseProcessor(res)
		case client.QRCodeImageFetch, client.QRCodeWaitingForScan:
			// ignore
		}
	}
}

func loginResponseProcessor(res *client.LoginResponse) error {
	var err error
	for {
		if err != nil {
			return err
		}
		if res.Success {
			return nil
		}
		var text string
		switch res.Error {
		case client.SliderNeededError:
			log.Warnf("登录需要滑条验证码, 请验证后重试.")
			ticket := getTicket(res.VerifyUrl)
			if ticket == "" {
				log.Infof("按 Enter 继续....")
				readLine()
				os.Exit(0)
			}
			res, err = cli.SubmitTicket(ticket)
			continue
		case client.NeedCaptcha:
			log.Warnf("登录需要验证码.")
			_ = os.WriteFile("captcha.jpg", res.CaptchaImage, 0o644)
			log.Warnf("请输入验证码 (captcha.jpg)： (Enter 提交)")
			text = readLine()
			global.DelFile("captcha.jpg")
			res, err = cli.SubmitCaptcha(text, res.CaptchaSign)
			continue
		case client.SMSNeededError:
			log.Warnf("账号已开启设备锁, 按 Enter 向手机 %v 发送短信验证码.", res.SMSPhone)
			readLine()
			if !cli.RequestSMS() {
				log.Warnf("发送验证码失败，可能是请求过于频繁.")
				return errors.WithStack(ErrSMSRequestError)
			}
			log.Warn("请输入短信验证码： (Enter 提交)")
			text = readLine()
			res, err = cli.SubmitSMS(text)
			continue
		case client.SMSOrVerifyNeededError:
			log.Warnf("账号已开启设备锁，请选择验证方式:")
			log.Warnf("1. 向手机 %v 发送短信验证码", res.SMSPhone)
			log.Warnf("2. 使用手机QQ扫码验证.")
			log.Warn("请输入(1 - 2)：")
			text = readIfTTY("2")
			if strings.Contains(text, "1") {
				if !cli.RequestSMS() {
					log.Warnf("发送验证码失败，可能是请求过于频繁.")
					return errors.WithStack(ErrSMSRequestError)
				}
				log.Warn("请输入短信验证码： (Enter 提交)")
				text = readLine()
				res, err = cli.SubmitSMS(text)
				continue
			}
			fallthrough
		case client.UnsafeDeviceError:
			log.Warnf("账号已开启设备锁，请前往 -> %v <- 验证后重启Bot.", res.VerifyUrl)
			log.Infof("按 Enter 或等待 5s 后继续....")
			readLineTimeout(time.Second * 5)
			os.Exit(0)
		case client.OtherLoginError, client.UnknownLoginError, client.TooManySMSRequestError:
			msg := res.ErrorMessage
			log.Warnf("登录失败: %v Code: %v", msg, res.Code)
			switch res.Code {
			case 235:
				log.Warnf("设备信息被封禁, 请删除 device.json 后重试.")
			case 237:
				log.Warnf("登录过于频繁, 请在手机QQ登录并根据提示完成认证后等一段时间重试")
			case 45: // 在提供 t544 后还是出现45错误是需要强行升级到最新客户端或被限制非常用设备
				log.Warnf("你的账号涉嫌违规被限制在非常用设备登录, 请在手机QQ登录并根据提示完成认证")
				log.Warnf("或使用 -update-protocol 升级到最新协议后重试")
			}
			if res.Code == 235 {
				log.Warnf("请删除 device.json 后重试.")
			}
			log.Infof("按 Enter 继续....")
			readLine()
			os.Exit(0)
		}
	}
}

func getTicket(u string) string {
	log.Warnf("请选择提交滑块ticket方式:")
	log.Warnf("1. 自动提交")
	log.Warnf("2. 手动抓取提交")
	log.Warn("请输入(1 - 2)：")
	text := readLine()
	id := utils.RandomString(8)
	auto := !strings.Contains(text, "2")
	if auto {
		u = strings.ReplaceAll(u, "https://ssl.captcha.qq.com/template/wireless_mqq_captcha.html?", fmt.Sprintf("https://captcha.go-cqhttp.org/captcha?id=%v&", id))
	}
	log.Warnf("请前往该地址验证 -> %v ", u)
	if !auto {
		log.Warn("请输入ticket： (Enter 提交)")
		return readLine()
	}

	for count := 120; count > 0; count-- {
		str := fetchCaptcha(id)
		if str != "" {
			return str
		}
		time.Sleep(time.Second)
	}
	log.Warnf("验证超时")
	return ""
}

func fetchCaptcha(id string) string {
	g, err := download.Request{URL: "https://captcha.go-cqhttp.org/captcha/ticket?id=" + id}.JSON()
	if err != nil {
		log.Debugf("获取 Ticket 时出现错误: %v", err)
		return ""
	}
	if g.Get("ticket").Exists() {
		return g.Get("ticket").String()
	}
	return ""
}

func energy(uin uint64, id string, appVersion string, salt []byte) ([]byte, error) {
	if localSigner, ok := encryption.T544Signer[appVersion]; ok {
		log.Debugf("use local T544Signer v%s", appVersion)
		result := localSigner(time.Now().UnixMicro(), salt)
		log.Debugf("t544 sign result: %x", result)
		return result, nil
	}
	log.Debugf("fallback to remote T544Signer v%s", appVersion)
	signServer := "https://captcha.go-cqhttp.org/sdk/dandelion/energy"
	if base.SignServerOverwrite != "" {
		signServer = base.SignServerOverwrite
	}
	response, err := download.Request{
		Method: http.MethodPost,
		URL:    signServer,
		Header: map[string]string{"Content-Type": "application/x-www-form-urlencoded"},
		Body:   bytes.NewReader([]byte(fmt.Sprintf("uin=%v&id=%s&salt=%s&version=%s", uin, id, hex.EncodeToString(salt), appVersion))),
	}.Bytes()
	if err != nil {
		log.Errorf("获取T544时出现问题: %v", err)
		return nil, err
	}
	sign, err := hex.DecodeString(gjson.GetBytes(response, "result").String())
	if err != nil || len(sign) == 0 {
		log.Errorf("获取T544时出现问题: %v", err)
		return nil, err
	}
	log.Debugf("t544 sign result: %x", sign)
	return sign, nil
}