'use client';

import React, { useEffect, useState, use } from 'react';
import { useRouter, useSearchParams } from 'next/navigation';
import {
  fetchFounderClubContext,
  FounderClubContext,
  sanitizePortalError,
} from '../../../../../lib/club-data';
import { FounderPortalShell } from '../../../../../components/founder-portal/founder-portal-shell';
import { FounderSettingsEditor } from '../../../../../components/founder-portal/founder-settings-editor';
import { OverviewSkeleton } from '../../../../../components/founder-portal/skeleton-state';
import { SafeErrorState } from '../../../../../components/founder-portal/safe-error-state';
import { firebaseAuth } from '../../../../../lib/firebase-client';

interface PageProps {
  params: Promise<{ clubId: string }>;
}

export default function ClubFounderSettingsPage({ params }: PageProps) {
  const { clubId } = use(params);
  const router = useRouter();
  const searchParams = useSearchParams();

  const [context, setContext] = useState<FounderClubContext | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [unauthenticated, setUnauthenticated] = useState(false);
  const [unauthorized, setUnauthorized] = useState(false);

  async function loadData() {
    setLoading(true);
    setError(null);
    setUnauthenticated(false);
    setUnauthorized(false);

    try {
      await firebaseAuth.authStateReady();
      const currentUser = firebaseAuth.currentUser;
      const isDemoPreview = searchParams?.get('preview') === 'demo';

      // Unauthenticated Guard: Direct access without demo preview requires authentication
      if (!isDemoPreview && !currentUser) {
        setUnauthenticated(true);
        setLoading(false);
        return;
      }

      const ctx = await fetchFounderClubContext(clubId, currentUser?.uid, {
        allowDemoPreview: isDemoPreview,
      });

      // Authorization Guard: Owner and Admin can access Settings; Members cannot
      if (!isDemoPreview && !ctx.permissions.canManageSettings) {
        setUnauthorized(true);
        setLoading(false);
        return;
      }

      setContext(ctx);
    } catch (err) {
      setError(sanitizePortalError(err, "Club settings couldn't be loaded."));
    } finally {
      setLoading(false);
    }
  }

  useEffect(() => {
    void loadData();
  }, [clubId]);

  if (loading) {
    return (
      <div className="min-h-screen bg-brand-bg telemetry-grid-bg p-6">
        <div className="max-w-5xl mx-auto">
          <OverviewSkeleton />
        </div>
      </div>
    );
  }

  // Unauthenticated safe error state
  if (unauthenticated) {
    return (
      <div className="min-h-screen bg-brand-bg telemetry-grid-bg flex items-center justify-center p-6">
        <div className="max-w-5xl mx-auto w-full flex items-center justify-center">
          <SafeErrorState
            title="Authentication Required"
            message="Sign in with your rider account to access club settings."
            actionLabel="Sign In"
            onAction={() => router.push('/login')}
          />
        </div>
      </div>
    );
  }

  // Unauthorized (Member or non-admin) safe error state
  if (unauthorized) {
    return (
      <div className="min-h-screen bg-brand-bg telemetry-grid-bg flex items-center justify-center p-6">
        <div className="max-w-5xl mx-auto w-full flex items-center justify-center">
          <SafeErrorState
            title="Management Access Restricted"
            message="You must be an Owner or Admin of this Club to access Club Settings."
            actionLabel="Return to Clubs"
            onAction={() => router.push('/clubs')}
          />
        </div>
      </div>
    );
  }

  // Error or missing context
  if (error || !context) {
    return (
      <div className="min-h-screen bg-brand-bg telemetry-grid-bg flex items-center justify-center p-6">
        <div className="max-w-5xl mx-auto w-full flex items-center justify-center">
          <SafeErrorState
            title="Settings Unavailable"
            message={error ?? "Club settings couldn't be loaded."}
            actionLabel="Return to Clubs"
            onAction={() => router.push('/clubs')}
            onRetry={loadData}
          />
        </div>
      </div>
    );
  }

  return (
    <FounderPortalShell
      club={context.club}
      permissions={context.permissions}
      activeNav="settings"
      pendingApplicationsCount={0}
      upcomingRidesCount={0}
    >
      <FounderSettingsEditor
        club={context.club}
        permissions={context.permissions}
        callerUid={context.currentUser.uid}
        isDemoFixture={context.isDemoFixture}
        onClubUpdated={(updated) => {
          setContext((prev) => {
            if (!prev) return null;
            const isFormerOwner = updated.ownerUid && updated.ownerUid !== prev.club.ownerUid;
            return {
              ...prev,
              club: {
                ...prev.club,
                ...updated,
              },
              currentUser: isFormerOwner
                ? { ...prev.currentUser, role: 'admin', displayRank: 'Admin' }
                : prev.currentUser,
              permissions: isFormerOwner
                ? { ...prev.permissions, role: 'admin', canTransferOwnership: false }
                : prev.permissions,
            };
          });
        }}
      />
    </FounderPortalShell>
  );
}