import React, { useState, useEffect } from 'react';
import { createPortal } from 'react-dom';
import { useNavigate } from 'react-router-dom';
import {
  RefreshCw,
  LogOut,
  Building2,
  Clock,
  ArrowLeft,
  Sparkles,
} from 'lucide-react';
import { PfmPartnerLogo } from '../common/PfmPartnerLogo';
import { AuthUserProfile, UserClaims } from '../../auth/AuthProvider';
import { cancelSessionExpiration, dismissSubordinateModals } from '../../services/sessionExpiration';

interface AccountActivationModalProps {
  user: AuthUserProfile | null;
  claims: UserClaims;
  sub: string;
  onSync: (force?: boolean) => Promise<{ success: boolean; isUnauthorized?: boolean; errorMessage?: string }>;
  onLogout: () => Promise<void>;
  initialError?: string | null;
}

const formatLockoutMessage = (msg?: string | null): string | null => {
  if (!msg) return null;
  const trimmed = msg.trim();
  if (/^network\s*error$/i.test(trimmed)) {
    return 'Permission Check';
  }
  return trimmed.replace(/network\s*error/gi, 'Permission Check');
};

export const AccountActivationModal: React.FC<AccountActivationModalProps> = ({
  user,
  claims,
  onSync,
  onLogout,
  initialError,
}) => {
  const navigate = useNavigate();
  const [isSyncing, setIsSyncing] = useState(false);
  const [errorMessage, setErrorMessage] = useState<string | null>(formatLockoutMessage(initialError) || null);

  useEffect(() => {
    if (initialError !== undefined) {
      setErrorMessage(formatLockoutMessage(initialError));
    }
  }, [initialError]);

  useEffect(() => {
    cancelSessionExpiration();
    dismissSubordinateModals();
  }, []);

  const displayName =
    user?.name ||
    (claims.name as string) ||
    (claims.preferred_username as string) ||
    'Partner';

  const tenant = user?.tenant || (claims.tenant as string) || (claims.org as string) || 'Partner Organisation';

  const handleSyncClick = async () => {
    if (isSyncing) return;
    setIsSyncing(true);
    setErrorMessage(null);

    try {
      const result = await onSync(true);

      if (result.isUnauthorized) {
        await onLogout();
        navigate('/', { replace: true });
        return;
      }

      if (!result.success) {
        setErrorMessage(
          formatLockoutMessage(
            result.errorMessage ||
              'Activation is still being reviewed by your funding administrator. Please check back shortly.'
          )
        );
      }
    } catch (err: unknown) {
      const errObj = err as { response?: { status?: number }; message?: string };
      if (errObj?.response?.status === 401) {
        await onLogout();
        navigate('/', { replace: true });
        return;
      }
      setErrorMessage('Permission Check: Unable to verify activation right now. Please try again in a few moments.');
    } finally {
      setIsSyncing(false);
    }
  };

  const handleSignOut = async () => {
    await onLogout();
    navigate('/', { replace: true });
  };

  const handleNavigateLanding = () => {
    navigate('/');
  };

  const modalContent = (
    <div
      role="dialog"
      aria-modal="true"
      aria-labelledby="activation-modal-title"
      className="fixed inset-0 z-[9999] flex items-center justify-center p-4 sm:p-6 bg-slate-950/80 backdrop-blur-2xl animate-in fade-in duration-300 select-none overflow-y-auto"
    >
      {/* Background ambient lighting matching LandingPage */}
      <div className="pointer-events-none absolute inset-0 overflow-hidden">
        <div className="absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 w-[500px] h-[500px] bg-gradient-to-tr from-emerald-500/15 via-teal-500/10 to-cyan-500/15 blur-[120px] rounded-full" />
      </div>

      <div
        className="relative w-full max-w-md rounded-3xl border border-white/10 bg-slate-900/85 backdrop-blur-xl shadow-[0_25px_60px_rgba(0,0,0,0.85),inset_0_1px_1px_rgba(255,255,255,0.15)] overflow-hidden flex flex-col items-center text-center p-8 sm:p-10 my-auto space-y-6"
        onClick={(e) => e.stopPropagation()}
      >
        {/* Glowing Brand Icon Lockup */}
        <div className="relative flex items-center justify-center pt-2">
          <div className="absolute -inset-3 rounded-full bg-emerald-500/20 blur-xl animate-pulse" />
          <PfmPartnerLogo className="h-16 w-16 drop-shadow-[0_8px_24px_rgba(16,185,129,0.35)] relative z-10" />
        </div>

        {/* Title & Organization Pill */}
        <div className="space-y-2">
          <div className="inline-flex items-center gap-1.5 px-3 py-1 rounded-full bg-emerald-500/10 border border-emerald-500/20 text-[11px] font-semibold text-emerald-300">
            <Clock className="w-3.5 h-3.5 text-emerald-400" />
            <span>Activation Pending</span>
          </div>
          <h2 id="activation-modal-title" className="text-2xl font-bold tracking-tight text-white">
            Welcome,{' '}
            <span className="bg-gradient-to-r from-emerald-300 via-teal-200 to-cyan-300 bg-clip-text text-transparent">
              {displayName}
            </span>
          </h2>
          <div className="inline-flex items-center gap-1.5 text-xs text-slate-400 font-medium">
            <Building2 className="w-3.5 h-3.5 text-teal-400 shrink-0" />
            <span>{tenant}</span>
          </div>
        </div>

        {/* Core Friendly Message */}
        <p className="text-sm text-slate-300 leading-relaxed max-w-sm">
          Your credentials have been authenticated. Your funding administrator is finalizing your portfolio access.
        </p>

        {/* Notice badge if check returned not yet ready */}
        {errorMessage && (
          <div className="w-full rounded-2xl bg-amber-500/10 border border-amber-500/20 p-3 text-xs text-amber-300/90 leading-relaxed text-center flex items-center justify-center gap-2">
            <Sparkles className="w-4 h-4 text-amber-400 shrink-0" />
            <span>{formatLockoutMessage(errorMessage)}</span>
          </div>
        )}

        {/* Action Button matching Specular / Landing styling */}
        <div className="w-full space-y-3 pt-2">
          <button
            onClick={handleSyncClick}
            disabled={isSyncing}
            type="button"
            id="activation-sync-btn"
            className="w-full py-3.5 px-6 rounded-2xl bg-gradient-to-r from-emerald-600 via-teal-600 to-emerald-500 hover:from-emerald-500 hover:to-teal-500 active:scale-[0.99] disabled:opacity-60 disabled:pointer-events-none text-white font-bold text-sm tracking-wide shadow-[0_12px_30px_rgba(16,185,129,0.35),inset_0_1px_1px_rgba(255,255,255,0.3)] hover:shadow-[0_16px_36px_rgba(16,185,129,0.5)] transition-all flex items-center justify-center gap-2 cursor-pointer"
          >
            <RefreshCw className={`w-4 h-4 text-emerald-100 ${isSyncing ? 'animate-spin' : ''}`} />
            <span>{isSyncing ? 'Checking Status...' : 'Check Account Status'}</span>
          </button>

          {/* Minimal Secondary Actions */}
          <div className="flex items-center justify-center gap-4 text-xs pt-1">
            <button
              onClick={handleNavigateLanding}
              type="button"
              className="inline-flex items-center gap-1.5 text-slate-400 hover:text-slate-200 transition-colors py-1 cursor-pointer"
            >
              <ArrowLeft className="w-3.5 h-3.5" />
              <span>Landing Page</span>
            </button>
            <span className="text-slate-700">•</span>
            <button
              onClick={handleSignOut}
              type="button"
              className="inline-flex items-center gap-1.5 text-slate-400 hover:text-rose-400 transition-colors py-1 cursor-pointer"
            >
              <LogOut className="w-3.5 h-3.5" />
              <span>Sign Out</span>
            </button>
          </div>
        </div>
      </div>
    </div>
  );

  return typeof document !== 'undefined'
    ? createPortal(modalContent, document.body)
    : modalContent;
};