import { Dialog, DialogContent, DialogOverlay } from "./ui/dialog";
import { Button } from "./ui/button";
import { ArrowLeft, Loader2, Phone, RotateCcw, LogIn } from "lucide-react";
import { useState, useEffect } from "react";
import { useSubmit, useRevalidator } from "@remix-run/react";
import {
  InputOTP,
  InputOTPGroup,
  InputOTPSlot,
} from "~/components/ui/input-otp";
import AppInput from "~/components/AppInput";
import { useToast } from "~/hooks/use-toast";
import {
  useServiceSendOtp,
  useServiceVerifyOtp,
} from "~/utils/RequestHandler";

interface LoginRequiredDialogProps {
  isOpen: boolean;
  onOpenChange: (isOpen: boolean) => void;
  loginTitle: string;
}

// Helper function to convert Persian numbers to English
const convertPersianToEnglish = (str: string): string => {
  const persianNumbers = ["۰", "۱", "۲", "۳", "۴", "۵", "۶", "۷", "۸", "۹"];
  const englishNumbers = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"];

  let result = str;
  for (let i = 0; i < 10; i++) {
    result = result.replace(
      new RegExp(persianNumbers[i], "g"),
      englishNumbers[i]
    );
  }
  return result;
};

const ResendTimer = ({
  initialTime = 120,
  onTimerEnd,
}: {
  initialTime?: number;
  onTimerEnd?: () => void;
}) => {
  const [timeLeft, setTimeLeft] = useState(initialTime);

  useEffect(() => {
    if (timeLeft <= 0) {
      if (onTimerEnd) onTimerEnd();
      return;
    }

    const timer = setInterval(() => {
      setTimeLeft((prev) => prev - 1);
    }, 1000);

    return () => clearInterval(timer);
  }, [timeLeft, onTimerEnd]);

  const formatTime = (seconds: number) => {
    const minutes = Math.floor(seconds / 60);
    const remainingSeconds = seconds % 60;
    return `${minutes}:${remainingSeconds < 10 ? `0${remainingSeconds}` : remainingSeconds}`;
  };

  return (
    <p className="text-GRAY text-R12">
      {formatTime(timeLeft)} &nbsp;تا ارسال مجدد کد
    </p>
  );
};

export function LoginRequiredDialog({
  isOpen,
  onOpenChange,
  loginTitle,
}: LoginRequiredDialogProps) {
  const { toast } = useToast();
  const submit = useSubmit();
  const revalidator = useRevalidator();

  const [phoneNumber, setPhoneNumber] = useState("");
  const [otpValue, setOtpValue] = useState("");
  const [enableVerifySection, setEnableVerifySection] = useState(false);
  const [canResend, setCanResend] = useState(false);

  const sendOtpMutation = useServiceSendOtp(
    phoneNumber,
    setEnableVerifySection
  );

  const verifyOtpMutation = useServiceVerifyOtp(phoneNumber, otpValue, toast);

  // Handle successful verification
  useEffect(() => {
    if (
      verifyOtpMutation.data &&
      verifyOtpMutation.data.accessToken &&
      verifyOtpMutation.data.refreshToken
    ) {
      const currentUrl = window.location.pathname;
      submit(
        {
          phoneNumber: phoneNumber,
          access_token: JSON.stringify(verifyOtpMutation.data.accessToken),
          refresh_token: JSON.stringify(verifyOtpMutation.data.refreshToken),
          redirectTo: currentUrl,
        },
        {
          action: "/login",
          method: "post",
          encType: "application/x-www-form-urlencoded",
        }
      );
      // Close modal and revalidate after successful login
      onOpenChange(false);
      revalidator.revalidate();
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [verifyOtpMutation.data]);

  useEffect(() => {
    if (enableVerifySection) setCanResend(false);
  }, [enableVerifySection]);

  const handleTimerEnd = () => {
    setCanResend(true);
  };

  // Reset state when modal closes
  useEffect(() => {
    if (!isOpen) {
      setPhoneNumber("");
      setOtpValue("");
      setEnableVerifySection(false);
      setCanResend(false);
    }
  }, [isOpen]);

  return (
    <Dialog open={isOpen} onOpenChange={onOpenChange}>
      <DialogOverlay />
      <DialogContent className="p-4 bg-WHITE rounded-[15px] w-[calc(100%-40px)] max-h-[90vh] overflow-y-auto">
        <div className="flex flex-col gap-6 items-center">
          {enableVerifySection ? (
            // OTP Verification Section
            <>
              <div className="w-16 h-16 rounded-full bg-PRIMARY/10 flex items-center justify-center">
                <LogIn size={32} className="text-PRIMARY" />
              </div>
              <div className="flex flex-col gap-2 text-center w-full">
                <h3 className="text-B16 font-bold">کد تایید شماره موبایل</h3>
                <p className="text-R14 text-GRAY">
                  کد ارسال شده به {phoneNumber} را وارد کنید:
                </p>
                <Button
                  variant="ghost"
                  className="text-BLUE mx-auto"
                  size="lg"
                  onClick={() => setEnableVerifySection(false)}
                >
                  ویرایش شماره موبایل
                  <ArrowLeft className="mr-1" />
                </Button>
              </div>
              <div className="w-full flex justify-center">
                <InputOTP
                  maxLength={4}
                  onComplete={(finalValue) => {
                    const convertedValue = convertPersianToEnglish(finalValue);
                    setOtpValue(convertedValue);
                  }}
                  value={otpValue}
                  onChange={(value) => {
                    const convertedValue = convertPersianToEnglish(value);
                    setOtpValue(convertedValue);
                  }}
                >
                  <InputOTPGroup dir="ltr" className="gap-4">
                    <InputOTPSlot index={0} />
                    <InputOTPSlot index={1} />
                    <InputOTPSlot index={2} />
                    <InputOTPSlot index={3} />
                  </InputOTPGroup>
                </InputOTP>
              </div>
              <div className="gap-3 w-full flex flex-col items-center">
                <Button
                  disabled={verifyOtpMutation.isPending || !(otpValue.length === 4)}
                  className="w-full"
                  size="xl"
                  variant="dark"
                  onClick={() => verifyOtpMutation.mutate()}
                >
                  {verifyOtpMutation.isPending ? (
                    <>
                      <Loader2 className="animate-spin ml-2" />
                      درحال تایید...
                    </>
                  ) : (
                    "تایید شماره موبایل"
                  )}
                </Button>
                <div>
                  {!canResend ? (
                    <ResendTimer initialTime={120} onTimerEnd={handleTimerEnd} />
                  ) : (
                    <Button
                      variant="link"
                      size="lg"
                      className="text-BLUE font-bold p-0 h-auto gap-1"
                      onClick={() => {
                        setCanResend(false);
                        setOtpValue("");
                        sendOtpMutation.mutate();
                        toast({
                          description: "کد مجددا ارسال گردید",
                          title: "ارسال کد",
                        });
                      }}
                    >
                      <span className="text-B12">ارسال مجدد کد</span>
                      <RotateCcw className="size-5" />
                    </Button>
                  )}
                </div>
                <Button
                  variant="outline"
                  size="lg"
                  className="w-full"
                  onClick={() => onOpenChange(false)}
                >
                  انصراف
                </Button>
              </div>
            </>
          ) : (
            // Phone Number Entry Section
            <>
              <div className="w-16 h-16 rounded-full bg-PRIMARY/10 flex items-center justify-center">
                <LogIn size={32} className="text-PRIMARY" />
              </div>
              <div className="flex flex-col gap-2 text-center">
                <h3 className="text-B16 font-bold">ورود به حساب کاربری</h3>
                <p className="text-R14 text-GRAY">{loginTitle}</p>
              </div>
              <div className="w-full">
                <AppInput
                  inputTitle="شماره موبایل خود را وارد کنید:"
                  inputIcon={Phone}
                  inputValue={phoneNumber}
                  inputPlaceholder="مثل ۰۹۳۹۱۲۳۴۵۶۷"
                  inputOnChange={(e: React.ChangeEvent<HTMLInputElement>) => {
                    const value = e.target.value;
                    const convertedValue = convertPersianToEnglish(value);
                    if (/^\d*$/.test(convertedValue)) {
                      setPhoneNumber(convertedValue);
                    }
                  }}
                />
              </div>
              <div className="flex flex-col gap-3 w-full">
                <Button
                  disabled={
                    sendOtpMutation.isPending ||
                    !(phoneNumber.length === 11 && phoneNumber.startsWith("0"))
                  }
                  variant="dark"
                  size="xl"
                  className="w-full"
                  onClick={() => sendOtpMutation.mutate()}
                >
                  {sendOtpMutation.isPending ? (
                    <>
                      <Loader2 className="animate-spin ml-2" />
                      درحال ارسال کد
                    </>
                  ) : (
                    "تایید و ادامه"
                  )}
                </Button>
                <Button
                  variant="outline"
                  size="lg"
                  className="w-full"
                  onClick={() => onOpenChange(false)}
                >
                  انصراف
                </Button>
              </div>
            </>
          )}
        </div>
      </DialogContent>
    </Dialog>
  );
}