import React, { useCallback, useMemo, useState } from 'react';
import {
  useProposalsForOrganization,
  useUpdateProposalStatus,
} from '@/hooks/api/useProposalsAPI.ts';
import { useTranslation } from '@/hooks/useI18n.tsx';
import { useOrganizations } from '@/hooks/useOrganizations.ts';
import { Organization } from '@/types.ts';
import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/Tabs.tsx';
import ProposalCard from '@/components/organization/ProposalCard.tsx';

interface ProposalListProps {
  organization: Organization;
}

const ProposalList = ({ organization }: ProposalListProps) => {
  const { t } = useTranslation();
  const { organizations } = useOrganizations();
  const { data: proposalsData, isLoading } = useProposalsForOrganization(organization.ID);
  const updateProposalStatus = useUpdateProposalStatus();
  const [activeTab, setActiveTab] = useState('incoming');

  // Memoize proposals arrays to prevent unnecessary recalculations
  const incoming = useMemo(
    () => (Array.isArray(proposalsData?.incoming) ? proposalsData.incoming : []),
    [proposalsData]
  );
  const outgoing = useMemo(
    () => (Array.isArray(proposalsData?.outgoing) ? proposalsData.outgoing : []),
    [proposalsData]
  );

  // Memoize findOrg function to prevent recreation
  const findOrg = useCallback(
    (id: string) => {
      if (!id || !organizations || !Array.isArray(organizations)) return undefined;
      return organizations.find((o) => o?.ID === id);
    },
    [organizations]
  );

  // Memoize status update handler
  const handleStatusUpdate = useCallback(
    (id: string, status: 'pending' | 'accepted' | 'rejected') => {
      updateProposalStatus.mutate({ id, status });
    },
    [updateProposalStatus]
  );

  const renderProposalList = useCallback(
    (proposals: typeof incoming, type: 'incoming' | 'outgoing') => {
      if (isLoading) {
        return <p className="text-center text-muted-foreground py-8">{t('common.loading')}</p>;
      }

      if (!Array.isArray(proposals) || proposals.length === 0) {
        return (
          <p className="text-center text-muted-foreground py-8">
            {t('organizationPage.partnershipHub.noProposals')}
          </p>
        );
      }
      return (
        <div className="space-y-3 max-h-96 overflow-y-auto pr-2">
          {proposals
            .filter((p) => p?.id) // Filter out invalid proposals
            .map((p) => {
              const partnerOrg = type === 'incoming' ? findOrg(p.fromOrgId) : findOrg(p.toOrgId);
              if (!partnerOrg) return null;
              return (
                <ProposalCard
                  key={p.id}
                  proposal={p}
                  partner={partnerOrg}
                  type={type}
                  onStatusUpdate={handleStatusUpdate}
                />
              );
            })
            .filter(Boolean)}{' '}
          {/* Remove null entries */}
        </div>
      );
    },
    [isLoading, t, findOrg, handleStatusUpdate]
  );

  return (
    <Tabs value={activeTab} onValueChange={setActiveTab} className="mt-2">
      <TabsList className="w-full grid grid-cols-2">
        <TabsTrigger value="incoming">
          {t('organizationPage.partnershipHub.incoming')} ({incoming.length})
        </TabsTrigger>
        <TabsTrigger value="outgoing">
          {t('organizationPage.partnershipHub.outgoing')} ({outgoing.length})
        </TabsTrigger>
      </TabsList>
      <TabsContent value="incoming">{renderProposalList(incoming, 'incoming')}</TabsContent>
      <TabsContent value="outgoing">{renderProposalList(outgoing, 'outgoing')}</TabsContent>
    </Tabs>
  );
};

export default React.memo(ProposalList);