'use client';

import { useEffect, useState } from "react";
import ModalCloseSvg from "../svgs/closexsvg";

type Props = {
  open: boolean;
  onClose: () => void;
  onSubmit?: (payload: { email: string; code?: string; newPassword: string }) => void;
  showVerification?: boolean;
  devVerificationState?: 'initial' | 'sent' | 'verified' | 'failed';
  initialEmail?: string;
};

export default function ChangePasswordModal({ open, onClose, onSubmit, showVerification = false, devVerificationState, initialEmail }: Props) {
  const [email, setEmail] = useState(initialEmail || "");
  const [code, setCode] = useState("");
  const [newPassword, setNewPassword] = useState("");
  const [confirmPassword, setConfirmPassword] = useState("");
  const [error, setError] = useState<string | null>(null); // 인증번호 오류 등
  const [requireCode, setRequireCode] = useState<boolean>(showVerification);
  const [isCodeSent, setIsCodeSent] = useState<boolean>(showVerification);
  const canConfirm = code.trim().length > 0;
  const [isVerified, setIsVerified] = useState(false);
  const hasError = !!error;

  // initialEmail이 변경되면 email state 업데이트
  useEffect(() => {
    if (initialEmail) {
      setEmail(initialEmail);
    }
  }, [initialEmail]);

  // 외부에서 전달된 개발모드 상태(devVerificationState)에 따라 UI 동기화
  useEffect(() => {
    if (!devVerificationState) return;
    switch (devVerificationState) {
      case 'initial':
        setRequireCode(false);
        setIsCodeSent(false);
        setCode("");
        setError(null);
        setIsVerified(false);
        break;
      case 'sent':
        setRequireCode(true);
        setIsCodeSent(true);
        setCode("");
        setError(null);
        setIsVerified(false);
        break;
      case 'verified':
        setRequireCode(true);
        setIsCodeSent(true);
        setCode("123456");
        setError(null);
        setIsVerified(true);
        break;
      case 'failed':
        setRequireCode(true);
        setIsCodeSent(true);
        setCode("");
        setError("올바르지 않은 인증번호입니다. 인증번호를 확인해주세요.");
        setIsVerified(false);
        break;
      default:
        break;
    }
  }, [devVerificationState]);

  if (!open) return null;

  const handleSubmit = () => {
    setError(null);
    if (requireCode) {
      if (!code) {
        setError("인증번호를 입력해 주세요.");
        return;
      }
    }
    if (!newPassword || !confirmPassword) {
      setError("새 비밀번호를 입력해 주세요.");
      return;
    }
    if (newPassword !== confirmPassword) {
      setError("새 비밀번호가 일치하지 않습니다.");
      return;
    }
    onSubmit?.({ email, code: requireCode ? code : undefined, newPassword });
    onClose();
  };

  return (
    <div
      className="fixed inset-0 z-50 flex items-center justify-center bg-black/40 backdrop-blur-[2px]"
      role="dialog"
      aria-modal="true"
    >
      <div className="w-[480px] rounded-[12px] border border-[#dee1e6] bg-white shadow-[0_10px_30px_rgba(0,0,0,0.06)]">
        {/* header */}
        <div className="flex items-center justify-between p-6">
          <h2 className="text-[20px] font-bold leading-[1.5] text-[#333c47]">비밀번호 변경</h2>
          <button
            type="button"
            aria-label="닫기"
            onClick={onClose}
            className="inline-flex size-6 items-center justify-center text-[#333c47] hover:opacity-80 cursor-pointer"
          >
            <ModalCloseSvg />
          </button>
        </div>

        {/* body */}
        <div className="flex flex-col gap-[10px] px-6">
          <div className="flex flex-col gap-2">
            <label className="w-[100px] text-[15px] font-semibold leading-[1.5] text-[#6c7682]">아이디 (이메일)</label>
            <div className="flex items-center gap-3">
              <input
                type="email"
                value={email}
                onChange={(e) => setEmail(e.target.value)}
                className={[
                  "h-10 flex-1 rounded-[8px] border border-[#dee1e6] px-3 text-[16px] leading-[1.5] text-[#333c47] placeholder-[#b1b8c0] outline-none",
                  hasError ? "bg-white" : isCodeSent ? "bg-neutral-50" : "bg-white",
                ].join(" ")}
                placeholder="이메일"
              />
              <button
                type="button"
                onClick={() => {
                  setRequireCode(true);
                  setIsCodeSent(true);
                  setError(null);
                }}
                className="h-10 w-[136px] rounded-[8px] bg-[#f1f3f5] px-3 text-[16px] font-semibold leading-[1.5] text-[#333c47] cursor-pointer"
              >
                {isCodeSent ? "인증번호 재전송" : "인증번호 전송"}
              </button>
            </div>
          </div>
          {requireCode ? (
            <div className="flex flex-col gap-2">
              <div className="w-[100px] text-[15px] font-semibold leading-[1.5] text-[#6c7682]">인증번호</div>
              <div className="flex items-center gap-3">
                <input
                  type="text"
                  value={code}
                  onChange={(e) => setCode(e.target.value)}
                  className="h-10 flex-1 rounded-[8px] border border-[#dee1e6] bg-white px-3 text-[16px] leading-[1.5] text-[#333c47] placeholder-[#b1b8c0] outline-none"
                  placeholder="인증번호를 입력해 주세요."
                />
                <button
                  type="button"
                  disabled={!canConfirm}
                  className={[
                    "h-10 w-[136px] rounded-[8px] px-3 text-[16px] font-semibold leading-[1.5] cursor-pointer disabled:cursor-default",
                    canConfirm ? "bg-[#f1f3f5] text-[#4c5561]" : "bg-gray-50 text-[#b1b8c0]",
                  ].join(" ")}
                >
                  인증번호 확인
                </button>
              </div>
              {isCodeSent && !hasError && !isVerified ? (
                <div className="px-1">
                  <p className="text-[13px] font-semibold leading-[1.4] text-[#384fbf]">
                    인증 확인을 위해 작성한 이메일로 인증번호를 발송했습니다.
                  </p>
                  <p className="text-[13px] font-semibold leading-[1.4] text-[#384fbf]">
                    이메일을 확인해 주세요.
                  </p>
                </div>
              ) : null}
              {error ? (
                <p className="px-1 text-[13px] font-semibold leading-[1.4] text-[#f64c4c]">
                  {error}
                </p>
              ) : null}
            </div>
          ) : null}
          <div className="flex flex-col gap-2">
            <label className="text-[15px] font-semibold leading-[1.5] text-[#6c7682]">새 비밀번호</label>
            <input
              type="password"
              value={newPassword}
              onChange={(e) => setNewPassword(e.target.value)}
              disabled={!isVerified}
              className={[
                "h-10 rounded-[8px] border border-[#dee1e6] px-3 text-[16px] leading-[1.5] text-[#333c47] placeholder-[#b1b8c0] outline-none",
                isVerified ? "bg-white" : "bg-neutral-50",
              ].join(" ")}
              placeholder="새 비밀번호"
            />
          </div>
          <div className="flex flex-col gap-2">
            <label className="text-[15px] font-semibold leading-[1.5] text-[#6c7682]">
              새 비밀번호 확인
            </label>
            <input
              type="password"
              value={confirmPassword}
              onChange={(e) => setConfirmPassword(e.target.value)}
              disabled={!isVerified}
              className={[
                "h-10 rounded-[8px] border border-[#dee1e6] px-3 text-[16px] leading-[1.5] text-[#333c47] placeholder-[#b1b8c0] outline-none",
                isVerified ? "bg-white" : "bg-neutral-50",
              ].join(" ")}
              placeholder="새 비밀번호 확인"
            />
          </div>
        </div>

        {/* footer */}
        <div className="flex items-center justify-center gap-3 p-6">
          <button
            type="button"
            onClick={onClose}
            className="h-12 w-[136px] rounded-[10px] bg-[#f1f3f5] px-4 text-[16px] font-semibold leading-[1.5] text-[#4c5561] cursor-pointer"
          >
            취소
          </button>
          <button
            type="button"
            onClick={handleSubmit}
            className="h-12 w-[136px] rounded-[10px] bg-[#8598e8] px-4 text-[16px] font-semibold leading-[1.5] text-white cursor-pointer"
          >
            비밀번호 변경
          </button>
        </div>
      </div>
    </div>
  );
}


