import { useState, useEffect } from "react";
import { useDispatch, useSelector } from "react-redux";
import { useNavigate, Link } from "react-router-dom";
import { clearError } from "../features/slices/details-slice";
import fetchLoginUser from "../features/fetch-async/fetchLoginUser";

function LoginPage() {
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");

  const dispatch = useDispatch();
  const navigate = useNavigate();
  const { loading, error, token } = useSelector((state) => state.userDetails);

  // Redirect if already logged in
  useEffect(() => {
    if (token) {
      navigate("/");
    }
  }, [token, navigate]);

  // Clear error on unmount
  useEffect(() => {
    return () => {
      dispatch(clearError());
    };
  }, [dispatch]);

  const handleSubmit = async (e) => {
    e.preventDefault();

    const result = await dispatch(fetchLoginUser({ email, password }));

    if (fetchLoginUser.fulfilled.match(result)) {
      navigate("/");
    }
  };

  return (
    <div className="min-h-[60vh] flex items-center justify-center">
      <div className="w-full max-w-md bg-slate-900/80 backdrop-blur-xl rounded-2xl shadow-2xl border border-slate-700/60 p-8">
        <h1 className="text-2xl font-semibold text-slate-50 text-center mb-2">
          Login
        </h1>
        <p className="text-sm text-slate-400 text-center mb-6">
          Enter your email and password, then press the button to continue.
        </p>

        {error && (
          <div className="mb-4 p-3 rounded-xl bg-red-500/20 border border-red-500/50 text-red-300 text-sm text-center">
            {error.message || `Error: ${error.status}`}
          </div>
        )}

        <form onSubmit={handleSubmit} className="space-y-5">
          <div className="space-y-2">
            <label className="block text-sm font-medium text-slate-200">
              Email
            </label>
            <input
              type="email"
              value={email}
              onChange={(e) => setEmail(e.target.value)}
              placeholder="Your email"
              className="w-full rounded-xl bg-slate-800/80 border border-slate-600 focus:border-indigo-400 focus:ring-2 focus:ring-indigo-500/60 focus:outline-none px-4 py-2.5 text-slate-100 placeholder:text-slate-500 text-sm"
              required
              disabled={loading}
            />
          </div>

          <div className="space-y-2">
            <label className="block text-sm font-medium text-slate-200">
              Password
            </label>
            <input
              type="password"
              value={password}
              minLength={8}
              onChange={(e) => setPassword(e.target.value)}
              placeholder="Your password"
              className="w-full rounded-xl bg-slate-800/80 border border-slate-600 focus:border-indigo-400 focus:ring-2 focus:ring-indigo-500/60 focus:outline-none px-4 py-2.5 text-slate-100 placeholder:text-slate-500 text-sm"
              required
              disabled={loading}
            />
          </div>

          <button
            type="submit"
            disabled={loading}
            className="w-full mt-2 inline-flex items-center justify-center rounded-xl bg-indigo-500 hover:bg-indigo-400 active:bg-indigo-600 disabled:bg-indigo-500/50 disabled:cursor-not-allowed transition-colors px-4 py-2.5 text-sm font-semibold text-white shadow-lg shadow-indigo-500/30"
          >
            {loading ? (
              <>
                <svg
                  className="animate-spin -ml-1 mr-2 h-4 w-4 text-white"
                  xmlns="http://www.w3.org/2000/svg"
                  fill="none"
                  viewBox="0 0 24 24"
                >
                  <circle
                    className="opacity-25"
                    cx="12"
                    cy="12"
                    r="10"
                    stroke="currentColor"
                    strokeWidth="4"
                  ></circle>
                  <path
                    className="opacity-75"
                    fill="currentColor"
                    d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"
                  ></path>
                </svg>
                Logging in...
              </>
            ) : (
              "Login"
            )}
          </button>
        </form>

        <p className="mt-6 text-center text-sm text-slate-400">
          Don't have an account?{" "}
          <Link
              to="/register"
              className="text-indigo-400 hover:text-indigo-300 transition-colors"
          >
            Register
          </Link>
        </p>
      </div>
    </div>
  );
}

export default LoginPage;