import { useState } from "react";
import { Link, useNavigate } from "react-router-dom";
import { useAuthStore } from "../stores/auth.ts";

export function LoginForm() {
  const [isRegister, setIsRegister] = useState(false);
  const [email, setEmail] = useState("");
  const [username, setUsername] = useState("");
  const [password, setPassword] = useState("");
  const [confirmPassword, setConfirmPassword] = useState("");
  const { login, register, isLoading, error, clearError } = useAuthStore();
  const navigate = useNavigate();

  const handleSubmit = async (event: React.FormEvent) => {
    event.preventDefault();
    clearError();

    if (isRegister) {
      if (password !== confirmPassword) return;
      await register(email, username, password);
    } else {
      await login(email, password);
    }

    navigate("/");
  };

  return (
    <div className="h-full w-full flex items-center justify-center bg-gb-bg p-4">
      <div className="terminal-border bg-gb-bg-h p-6 w-full max-w-md">
        <pre className="text-gb-orange font-mono text-lg mb-6">
          {"┌─ DUMPSTER ─┐"}
        </pre>
        <h2 className="text-gb-fg-s mb-4">
          {isRegister ? "[REGISTER]" : "[LOGIN]"}
        </h2>
        <form onSubmit={handleSubmit} className="space-y-4">
          {isRegister ? (
            <>
              <div>
                <label className="block text-gb-fg-t mb-1">EMAIL:</label>
                <input
                  type="email"
                  value={email}
                  onChange={(e) => setEmail(e.target.value)}
                  className="terminal-input"
                  required
                  autoComplete="email"
                />
              </div>
              <div>
                <label className="block text-gb-fg-t mb-1">USERNAME:</label>
                <input
                  type="text"
                  value={username}
                  onChange={(e) => setUsername(e.target.value)}
                  className="terminal-input"
                  required
                  autoComplete="username"
                />
              </div>
            </>
          ) : (
            <div>
              <label className="block text-gb-fg-t mb-1">
                EMAIL OR USERNAME:
              </label>
              <input
                type="text"
                value={email}
                onChange={(e) => setEmail(e.target.value)}
                className="terminal-input"
                required
                autoComplete="username"
                placeholder="email or username"
              />
            </div>
          )}
          <div>
            <label className="block text-gb-fg-t mb-1">PASSWORD:</label>
            <input
              type="password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              className="terminal-input"
              required
              autoComplete={
                isRegister ? "new-password" : "current-password"
              }
            />
          </div>
          {isRegister && (
            <div>
              <label className="block text-gb-fg-t mb-1">
                CONFIRM PASSWORD:
              </label>
              <input
                type="password"
                value={confirmPassword}
                onChange={(e) => setConfirmPassword(e.target.value)}
                className="terminal-input"
                required
              />
            </div>
          )}
          {error && <p className="text-gb-red text-sm">ERR: {error}</p>}
          <button
            type="submit"
            className="terminal-button w-full"
            disabled={isLoading}
          >
            {isLoading
              ? "[PROCESSING...]"
              : isRegister
                ? "[REGISTER]"
                : "[LOGIN]"}
          </button>
        </form>
        {!isRegister && (
          <div className="mt-3">
            <button
              type="button"
              onClick={async () => {
                try {
                  const resp = await fetch(
                    "/api/v1/auth/webauthn/login/begin",
                    { method: "POST", credentials: "include" },
                  );
                  if (!resp.ok)
                    throw new Error("Passkey login not available");
                  const options = await resp.json();
                  const credential = await navigator.credentials.get({
                    publicKey: options,
                  });
                  if (!credential) return;
                  const finishResp = await fetch(
                    "/api/v1/auth/webauthn/login/finish",
                    {
                      method: "POST",
                      credentials: "include",
                      headers: { "Content-Type": "application/json" },
                      body: JSON.stringify(credential),
                    },
                  );
                  if (finishResp.ok) navigate("/");
                } catch (err) {
                  console.error("Passkey login failed:", err);
                }
              }}
              className="terminal-button w-full border-gb-aqua text-gb-aqua"
            >
              [SIGN IN WITH PASSKEY]
            </button>
          </div>
        )}
        <div className="mt-4 text-center">
          <button
            type="button"
            onClick={() => {
              setIsRegister(!isRegister);
              clearError();
            }}
            className="text-gb-blue hover:text-gb-aqua text-sm"
          >
            {isRegister ? "[BACK TO LOGIN]" : "[CREATE ACCOUNT]"}
          </button>
        </div>
        {!isRegister && (
          <p className="text-gb-fg-f text-xs mt-4 text-center">
            Use Link component:{" "}
            <Link to="/" className="text-gb-blue hover:text-gb-aqua">
              [HOME]
            </Link>
          </p>
        )}
      </div>
    </div>
  );
}