import React, { useState } from "react";
import {
  auth,
  googleProvider,
  signInWithPopup,
  signInWithEmailAndPassword,
  createUserWithEmailAndPassword,
} from "../config/firebase.js";
import { Lock, Mail, LogIn, UserPlus, AlertCircle, X } from "lucide-react";
import { useLanguage } from "../context/LanguageContext.js";

interface AuthModalProps {
  isOpen: boolean;
  onClose: () => void;
}

export const AuthModal: React.FC<AuthModalProps> = ({ isOpen, onClose }) => {
  const { language, t, isRtl } = useLanguage();
  const [mode, setMode] = useState<"login" | "register">("login");
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [error, setError] = useState("");
  const [loading, setLoading] = useState(false);

  if (!isOpen) return null;

  const handleGoogleSignIn = async () => {
    setLoading(true);
    setError("");
    try {
      await signInWithPopup(auth, googleProvider);
      onClose();
    } catch (err: unknown) {
      const msg = err instanceof Error ? err.message : "Google Sign-In failed.";
      setError(msg);
    } finally {
      setLoading(false);
    }
  };

  const handleEmailSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    if (!email || !password) {
      setError(language === "ar" ? "يرجى إدخال البريد الإلكتروني وكلمة المرور." : "Please fill in both email and password.");
      return;
    }
    setLoading(true);
    setError("");

    try {
      if (mode === "login") {
        await signInWithEmailAndPassword(auth, email, password);
      } else {
        await createUserWithEmailAndPassword(auth, email, password);
      }
      onClose();
    } catch (err: unknown) {
      const msg = err instanceof Error ? err.message : "Authentication failed.";
      setError(msg);
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="fixed inset-0 bg-slate-950/80 backdrop-blur-sm z-50 flex items-center justify-center p-4">
      <div className="bg-slate-900 border border-slate-800 rounded-xl p-6 max-w-md w-full shadow-2xl space-y-5 relative">
        <button
          onClick={onClose}
          className={`absolute top-4 ${isRtl ? "left-4" : "right-4"} text-slate-400 hover:text-white p-1 rounded-lg bg-slate-800 hover:bg-slate-700 transition-colors cursor-pointer`}
        >
          <X className="w-4 h-4" />
        </button>

        <div className="text-center">
          <div className="w-10 h-10 rounded-xl bg-cyan-500/10 border border-cyan-500/30 text-cyan-400 flex items-center justify-center mx-auto mb-2 font-bold font-mono text-base">
            GS
          </div>
          <h2 className="text-lg font-bold text-white font-display">
            {mode === "login" ? t.auth.signInTitle : (language === "ar" ? "إنشاء حساب جديد" : "Create Your Account")}
          </h2>
          <p className="text-xs text-slate-400 mt-1 font-sans">
            {t.auth.signInSubtitle}
          </p>
        </div>

        {error && (
          <div className="p-3 bg-rose-950/50 border border-rose-800/80 rounded-lg text-rose-300 text-xs font-mono flex items-center gap-2">
            <AlertCircle className="w-4 h-4 text-rose-400 shrink-0" />
            <span className="truncate">{error}</span>
          </div>
        )}

        {/* Google Registration & Sign In Button */}
        <button
          onClick={handleGoogleSignIn}
          disabled={loading}
          className="w-full py-2.5 px-4 bg-slate-800 hover:bg-slate-700 border border-slate-700 rounded-lg text-xs font-medium text-slate-200 transition-all flex items-center justify-center gap-2 shadow-sm font-sans cursor-pointer"
        >
          <svg className="w-4 h-4" viewBox="0 0 24 24">
            <path
              fill="#4285F4"
              d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92c-.26 1.37-1.04 2.53-2.21 3.31v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.09z"
            />
            <path
              fill="#34A853"
              d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23z"
            />
            <path
              fill="#FBBC05"
              d="M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.06H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.94l2.85-2.22.81-.63z"
            />
            <path
              fill="#EA4335"
              d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.06l3.66 2.84c.87-2.6 3.3-4.52 6.16-4.52z"
            />
          </svg>
          {t.auth.googleBtn}
        </button>

        <div className="flex items-center gap-3 text-[11px] font-mono text-slate-500 uppercase my-2">
          <div className="flex-1 h-px bg-slate-800" />
          <span>{language === "ar" ? "أو عبر البريد الإلكتروني" : "Or with Email"}</span>
          <div className="flex-1 h-px bg-slate-800" />
        </div>

        {/* Email & Password Form */}
        <form onSubmit={handleEmailSubmit} className="space-y-3">
          <div>
            <label className="text-[11px] font-mono text-slate-400 block mb-1">{t.auth.emailLabel}</label>
            <div className="relative">
              <Mail className={`w-4 h-4 text-slate-500 absolute ${isRtl ? "right-3" : "left-3"} top-2.5`} />
              <input
                type="email"
                required
                value={email}
                onChange={(e) => setEmail(e.target.value)}
                placeholder="analyst@sovereign-macro.org"
                className={`w-full bg-slate-950 border border-slate-800 rounded-lg ${isRtl ? "pr-9 pl-3 text-right" : "pl-9 pr-3 text-left"} py-2 text-xs text-slate-200 focus:outline-none focus:border-cyan-500`}
              />
            </div>
          </div>

          <div>
            <label className="text-[11px] font-mono text-slate-400 block mb-1">{t.auth.passwordLabel}</label>
            <div className="relative">
              <Lock className={`w-4 h-4 text-slate-500 absolute ${isRtl ? "right-3" : "left-3"} top-2.5`} />
              <input
                type="password"
                required
                value={password}
                onChange={(e) => setPassword(e.target.value)}
                placeholder="••••••••••••"
                className={`w-full bg-slate-950 border border-slate-800 rounded-lg ${isRtl ? "pr-9 pl-3 text-right" : "pl-9 pr-3 text-left"} py-2 text-xs text-slate-200 focus:outline-none focus:border-cyan-500`}
              />
            </div>
          </div>

          <button
            type="submit"
            disabled={loading}
            className="w-full py-2.5 px-4 bg-cyan-500 hover:bg-cyan-400 text-slate-950 font-bold text-xs rounded-lg transition-all flex items-center justify-center gap-1.5 shadow-md shadow-cyan-950/40 disabled:opacity-50 mt-2 cursor-pointer"
          >
            {mode === "login" ? <LogIn className="w-3.5 h-3.5" /> : <UserPlus className="w-3.5 h-3.5" />}
            {mode === "login" ? t.auth.submitSignIn : t.auth.submitSignUp}
          </button>
        </form>

        <div className="text-center pt-2 border-t border-slate-800 text-xs text-slate-400 font-sans">
          {mode === "login" ? (language === "ar" ? "ليس لديك حساب؟" : "Don't have an account?") : (language === "ar" ? "لديك حساب بالفعل؟" : "Already registered?")}{" "}
          <button
            type="button"
            onClick={() => {
              setMode(mode === "login" ? "register" : "login");
              setError("");
            }}
            className="text-cyan-400 hover:text-cyan-300 font-semibold underline underline-offset-2 cursor-pointer"
          >
            {mode === "login" ? (language === "ar" ? "سجل الآن" : "Register") : (language === "ar" ? "تسجيل الدخول" : "Sign In")}
          </button>
        </div>
      </div>
    </div>
  );
};