import { Eye, EyeOff, Loader2, LogIn } from "lucide-react";
import { useState, type CSSProperties, type FormEvent } from "react";
import { LegalFootnote } from "../LegalFootnote";
import { ShellBackdrop } from "../ShellBackdrop";
import type { SetupStatus } from "../../types";

type AuthMode = "login" | "signup";

type AuthViewProps = {
  authError: string;
  busy: boolean;
  setupStatus: SetupStatus;
  shellStyle: CSSProperties;
  themeId: string;
  resolvedMode: "light" | "dark";
  onLogin: (email: string, password: string) => Promise<void>;
  onSignup: (name: string, email: string, password: string) => Promise<void>;
};

export function AuthView({
  authError,
  busy,
  setupStatus,
  shellStyle,
  themeId,
  resolvedMode,
  onLogin,
  onSignup,
}: AuthViewProps) {
  const [mode, setMode] = useState<AuthMode>("login");
  const [name, setName] = useState("");
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [showPassword, setShowPassword] = useState(false);

  function submit(event: FormEvent<HTMLFormElement>) {
    event.preventDefault();
    if (mode === "signup") {
      void onSignup(name, email, password);
      return;
    }
    void onLogin(email, password);
  }

  return (
    <div className="app-shell min-h-screen" data-theme={themeId} data-mode={resolvedMode} style={shellStyle}>
      <ShellBackdrop />
      <main className="flex min-h-screen items-center justify-center p-6">
        <div className="auth-panel-shell">
          <div className="mb-8 text-center">
            <h1 className="hero-name text-3xl">Red Bull tracker</h1>
            <p className="hero-copy mt-2 text-sm">Track intake, sync across devices.</p>
          </div>

          <div className="auth-panel-card">
            {setupStatus.state !== "ok" && (
              <div className="limit-alert mb-4 px-3 py-2 text-xs">
                {setupStatus.message}
              </div>
            )}

            <div className="auth-mode-toggle mb-5">
              <button className={mode === "login" ? "auth-mode-active" : ""} type="button" onClick={() => setMode("login")}>
                Log in
              </button>
              <button className={mode === "signup" ? "auth-mode-active" : ""} type="button" onClick={() => setMode("signup")}>
                Sign up
              </button>
            </div>

            <form className="grid gap-3" onSubmit={submit}>
              {mode === "signup" && (
                <label className="field-label">
                  Name
                  <input className="field-control" type="text" autoComplete="name" value={name} onChange={(event) => setName(event.target.value)} placeholder="Ned" />
                </label>
              )}
              <label className="field-label">
                Email
                <input className="field-control" type="email" autoComplete="email" value={email} onChange={(event) => setEmail(event.target.value)} placeholder="you@example.com" required />
              </label>
              <label className="field-label">
                Password
                <span className="relative block">
                  <input
                    className="field-control pr-12"
                    minLength={8}
                    type={showPassword ? "text" : "password"}
                    autoComplete={mode === "signup" ? "new-password" : "current-password"}
                    value={password}
                    onChange={(event) => setPassword(event.target.value)}
                    placeholder="8+ characters"
                    required
                  />
                  <button
                    className="password-toggle"
                    type="button"
                    aria-label={showPassword ? "Hide password" : "Show password"}
                    aria-pressed={showPassword}
                    onClick={() => setShowPassword((current) => !current)}
                  >
                    {showPassword ? <EyeOff size={17} aria-hidden="true" /> : <Eye size={17} aria-hidden="true" />}
                  </button>
                </span>
              </label>

              {authError && (
                <div
                  className="rounded-md px-3 py-2 text-sm"
                  style={{
                    border: "1px solid color-mix(in srgb, var(--error) 35%, transparent)",
                    background: "var(--error-container)",
                    color: "var(--on-error-container)",
                  }}
                >
                  {authError}
                </div>
              )}

              <button className="primary-button w-full mt-1" type="submit" disabled={busy}>
                {busy ? <Loader2 className="animate-spin" size={17} aria-hidden="true" /> : <LogIn size={17} aria-hidden="true" />}
                {mode === "signup" ? "Create account" : "Log in"}
              </button>
            </form>

            <LegalFootnote className="mt-5" />
          </div>
        </div>
      </main>
    </div>
  );
}