import { useEffect, useState } from "react";
import { currentUser, login, User } from "./api";
import Header from "./Header";
import { useLocation, useNavigate } from "react-router";
import { Eye, EyeSlash } from "./Icons";

export interface LoginProps {
  onLogin: (user: User) => void;
}

export const Login = ({ onLogin }: LoginProps) => {
  const [username, setUsername] = useState("");
  const [password, setPassword] = useState("");
  const [error, setError] = useState("");
  const [loading, setLoading] = useState(false);
  const [visible, setVisible] = useState(false);
  const navigate = useNavigate();
  const location = useLocation();

  async function doLogin() {
    setLoading(true);
    setError("");
    const timeout = new Promise((r) => setTimeout(r, 1000));
    let user: User;
    try {
      await login({ username, password });
      user = await currentUser();
    } catch (e) {
      await timeout;
      setError("failed");
      setLoading(false);
      return;
    }
    await timeout;
    onLogin(user);
  }

  function handleSubmit(e: React.FormEvent) {
    e.preventDefault();
    doLogin();
  }

  useEffect(() => {
    if (location.state) {
      const queryUsername = location.state.username;
      const queryPassword = location.state.password;
      if (queryUsername) setUsername(queryUsername);
      if (queryPassword) setPassword(queryPassword);
      navigate(location.pathname, { replace: true });
    }
  }, []);

  return (
    <>
      <Header />
      <form onSubmit={handleSubmit}>
        <div
          style={{
            position: "relative",
            display: "flex",
            alignItems: "end",
          }}
        >
          <div
            style={{
              width: "100%",
              marginRight: "8px",
              display: "flex",
              justifyContent: "center",
              flexDirection: "column",
            }}
          >
            <div>
              <input
                type="text"
                id="username"
                name="username"
                placeholder="username"
                required
                value={username}
                onChange={(evt) => {
                  setError("");
                  setUsername(evt.target.value);
                }}
              />
            </div>
            <div>
              <input
                type={visible ? "text" : "password"}
                id="password"
                name="password"
                placeholder="password"
                minLength={8}
                value={password}
                required
                onChange={(evt) => {
                  setError("");
                  setPassword(evt.target.value);
                }}
              />
            </div>
          </div>
          <div
            style={{
              position: "absolute",
              right: "-1em",
              margin: "auto 4px",
              background: "unset",
              fontSize: "x-large",
              cursor: "pointer",
            }}
            onClick={() => setVisible(!visible)}
          >
            {visible ? <Eye /> : <EyeSlash />}
          </div>
        </div>
        {error && <span style={{ color: "red" }}>{error}</span>}
        <button type="submit" value="login" style={{ fontSize: "small" }}>
          login
        </button>
        {loading && <span className="loader" />}
      </form>
    </>
  );
};