import { useEffect, useState, type FormEvent } from "react";
import { useAuth } from "../hooks/useAuth";
import { get } from "../api/client";
import type { AuthConfig } from "../api/types";

export function LoginPage() {
  const { login } = useAuth();
  const [username, setUsername] = useState("");
  const [password, setPassword] = useState("");
  const [error, setError] = useState("");
  const [submitting, setSubmitting] = useState(false);
  const [oidcEnabled, setOidcEnabled] = useState(false);

  useEffect(() => {
    get<AuthConfig>("/api/auth/config")
      .then((cfg) => setOidcEnabled(cfg.oidc_enabled))
      .catch(() => {});
  }, []);

  const handleSubmit = async (e: FormEvent) => {
    e.preventDefault();
    if (!username.trim() || !password) return;
    setError("");
    setSubmitting(true);
    try {
      await login(username.trim(), password);
    } catch (err) {
      setError(err instanceof Error ? err.message : "Login failed");
    } finally {
      setSubmitting(false);
    }
  };

  return (
    <div style={containerStyle}>
      <div style={cardStyle}>
        <h1 style={titleStyle}>Silo</h1>
        <p style={subtitleStyle}>Product Lifecycle Management</p>

        {error && <div style={errorStyle}>{error}</div>}

        <form onSubmit={handleSubmit}>
          <div style={formGroupStyle}>
            <label style={labelStyle}>Username</label>
            <input
              className="silo-input"
              type="text"
              value={username}
              onChange={(e) => setUsername(e.target.value)}
              placeholder="Username or LDAP uid"
              autoFocus
              required
              style={inputStyle}
            />
          </div>
          <div style={formGroupStyle}>
            <label style={labelStyle}>Password</label>
            <input
              className="silo-input"
              type="password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              placeholder="Password"
              required
              style={inputStyle}
            />
          </div>
          <button type="submit" disabled={submitting} style={btnPrimaryStyle}>
            {submitting ? "Signing in..." : "Sign In"}
          </button>
        </form>

        {oidcEnabled && (
          <>
            <div style={dividerStyle}>
              <span style={dividerLineStyle} />
              <span
                style={{
                  padding: "0 1rem",
                  color: "var(--ctp-overlay0)",
                  fontSize: "var(--font-body)",
                }}
              >
                or
              </span>
              <span style={dividerLineStyle} />
            </div>
            <a href="/auth/oidc" style={btnOidcStyle}>
              Sign in with Keycloak
            </a>
          </>
        )}
      </div>
    </div>
  );
}

const containerStyle: React.CSSProperties = {
  display: "flex",
  justifyContent: "center",
  alignItems: "center",
  minHeight: "100vh",
  backgroundColor: "var(--ctp-base)",
};

const cardStyle: React.CSSProperties = {
  backgroundColor: "var(--ctp-surface0)",
  borderRadius: "1rem",
  padding: "2.5rem",
  width: "100%",
  maxWidth: 400,
  margin: "1rem",
};

const titleStyle: React.CSSProperties = {
  color: "var(--ctp-mauve)",
  textAlign: "center",
  fontSize: "2rem",
  fontWeight: 600,
  marginBottom: "0.25rem",
};

const subtitleStyle: React.CSSProperties = {
  color: "var(--ctp-subtext0)",
  textAlign: "center",
  fontSize: "var(--font-body)",
  marginBottom: "2rem",
};

const errorStyle: React.CSSProperties = {
  color: "var(--ctp-red)",
  background: "rgba(243, 139, 168, 0.1)",
  border: "1px solid rgba(243, 139, 168, 0.2)",
  padding: "0.75rem 1rem",
  borderRadius: "0.5rem",
  marginBottom: "1rem",
  fontSize: "var(--font-body)",
};

const formGroupStyle: React.CSSProperties = {
  marginBottom: "1.25rem",
};

const labelStyle: React.CSSProperties = {
  display: "block",
  marginBottom: "0.5rem",
  fontWeight: 500,
  color: "var(--ctp-subtext1)",
  fontSize: "var(--font-body)",
};

const inputStyle: React.CSSProperties = {
  width: "100%",
  padding: "0.75rem 1rem",
  backgroundColor: "var(--ctp-base)",
  border: "1px solid var(--ctp-surface1)",
  borderRadius: "0.5rem",
  color: "var(--ctp-text)",
  fontSize: "var(--font-body)",
  boxSizing: "border-box",
};

const btnPrimaryStyle: React.CSSProperties = {
  display: "block",
  width: "100%",
  padding: "0.75rem 1.5rem",
  borderRadius: "0.25rem",
  fontWeight: 500,
  fontSize: "0.75rem",
  cursor: "pointer",
  border: "none",
  backgroundColor: "var(--ctp-mauve)",
  color: "var(--ctp-crust)",
  textAlign: "center",
};

const dividerStyle: React.CSSProperties = {
  display: "flex",
  alignItems: "center",
  margin: "1.5rem 0",
};

const dividerLineStyle: React.CSSProperties = {
  flex: 1,
  borderTop: "1px solid var(--ctp-surface1)",
};

const btnOidcStyle: React.CSSProperties = {
  display: "block",
  width: "100%",
  padding: "0.75rem 1.5rem",
  borderRadius: "0.25rem",
  fontWeight: 500,
  fontSize: "0.75rem",
  cursor: "pointer",
  border: "none",
  backgroundColor: "var(--ctp-blue)",
  color: "var(--ctp-crust)",
  textAlign: "center",
  textDecoration: "none",
  boxSizing: "border-box",
};