import React, { useState, useEffect } from "react";
import {
  checkActionCode,
  confirmPasswordReset,
  getAuth,
  sendPasswordResetEmail,
} from "firebase/auth";
import Button from "../../pageElements/Button";
import { useSearchParams } from "react-router-dom";

const PasswordResetPage = () => {
  const auth = getAuth();
  const [isBusy, setIsBusy] = useState(false);
  const [isCodeValid, setIsCodeValid] = useState(null);
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [confirmPassword, setConfirmPassword] = useState("");
  const [done, setDone] = useState(false);
  const [notice, setNotice] = useState("");
  const [searchParams] = useSearchParams();
  const mode = searchParams.get("mode");
  const oobCode = searchParams.get("oobCode");

  useEffect(() => {
    async function handleCheckCode() {
      if (!oobCode) {
        setIsCodeValid(false);
        return;
      }
      try {
        await checkActionCode(auth, oobCode);
        setIsCodeValid(true);
      } catch (error) {
        setIsCodeValid(false);
      }
    }
    handleCheckCode();
  }, [auth, oobCode]);

  const handleResetPassword = async (e) => {
    e.preventDefault();
    if (isBusy) {
      return;
    }
    setIsBusy(true);
    setNotice("");
    try {
      await sendPasswordResetEmail(auth, email);
      setDone(true);
    } catch (error) {
      if (error.code === "auth/invalid-email") {
        setNotice("Invalid email.");
      } else {
        setNotice(`Error occured (${error.code}).`);
      }
    } finally {
      setIsBusy(false);
    }
  };

  const handleConfirmPasswordReset = async (e) => {
    e.preventDefault();
    if (isBusy) {
      return;
    }
    if (password !== confirmPassword) {
      setNotice("Passwords do not match");
      return;
    }
    setIsBusy(true);
    try {
      await confirmPasswordReset(auth, oobCode, password);
      setDone(true);
    } catch (error) {
      if (error.code === "auth/weak-password") {
        setNotice("Weak password.");
      } else {
        setNotice(`Error occured (${error.code}).`);
      }
    } finally {
      setIsBusy(false);
    }
  };

  const resetMode = mode === "resetPassword" ? "resetPassword" : "enterEmail";
  return (
    <div className="password-reset-container">
      <div className="password-reset-form-wrapper">
        <div className="password-reset-form">
          {resetMode === "enterEmail" ? (
            <>
              <div className="password-reset-header">
                <h2 className="password-reset-header-text">
                  Enter Account Email
                </h2>
              </div>
              {!done ? (
                <form>
                  <div className="form-floating">
                    <input
                      type="email"
                      className="form-control"
                      id="emailInput"
                      placeholder="Email"
                      value={email}
                      onChange={(e) => setEmail(e.target.value)}
                      disabled={isBusy}
                    ></input>
                    <label htmlFor="emailInput" className="form-label">
                      Email
                    </label>
                  </div>
                  <div className="alert-box">
                    {"" !== notice && (
                      <div className="password-reset-alert" role="alert">
                        {notice}
                      </div>
                    )}
                  </div>
                  <div className="password-reset-button-wrapper">
                    <Button
                      className="primary-button"
                      onClick={(e) => handleResetPassword(e)}
                      labelText="Submit"
                      disabled={isBusy}
                    />
                  </div>
                </form>
              ) : null}
              {done && (
                <div className="success-container">
                  <p className="reset-sent-text">
                    A password reset link was sent.
                  </p>
                </div>
              )}
            </>
          ) : null}
          {resetMode === "resetPassword" ? (
            <>
              <div className="password-reset-header">
                <h2 className="password-reset-header-text">
                  Enter New Password
                </h2>
              </div>
              {!done && isCodeValid !== null && isCodeValid ? (
                <form>
                  <div className="form-floating mb-3">
                    <input
                      type="password"
                      className="form-control"
                      id="passwordInput"
                      placeholder="Password"
                      value={password}
                      onChange={(e) => setPassword(e.target.value)}
                      disabled={isBusy}
                    ></input>
                    <label htmlFor="emailInput" className="form-label">
                      Enter new password
                    </label>
                  </div>
                  <div className="form-floating">
                    <input
                      type="password"
                      className="form-control"
                      id="confirmPasswordInput"
                      placeholder="Confirm Password"
                      value={confirmPassword}
                      onChange={(e) => setConfirmPassword(e.target.value)}
                      disabled={isBusy}
                    ></input>
                    <label
                      htmlFor="confirmPasswordInput"
                      className="form-label"
                    >
                      Confirm password
                    </label>
                  </div>
                  <div className="alert-box">
                    {"" !== notice && (
                      <div className="password-reset-alert" role="alert">
                        {notice}
                      </div>
                    )}
                  </div>
                  <div className="password-reset-button-wrapper">
                    <Button
                      className="primary-button"
                      onClick={(e) => handleConfirmPasswordReset(e)}
                      labelText="Submit"
                      disabled={isBusy}
                    />
                  </div>
                </form>
              ) : null}
              {!done && isCodeValid !== null && !isCodeValid && (
                <div className="success-container">
                  <p className="reset-sent-text">
                    Bad or already used password reset code.
                  </p>
                </div>
              )}
              {done && (
                <div className="success-container">
                  <p className="reset-sent-text">Password changed.</p>
                </div>
              )}
            </>
          ) : null}
        </div>
      </div>
    </div>
  );
};

export default PasswordResetPage;