import { MainLayout } from '@/components/layout/MainLayout.tsx';
import PageHeader from '@/components/layout/PageHeader.tsx';
import OrganizationStatistics from '@/components/organization/OrganizationStatistics.tsx';
import ResourceFlowList from '@/components/resource-flow/ResourceFlowList.tsx';
import Button from '@/components/ui/Button.tsx';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/Card.tsx';
import DateRangePicker, { type DateRange } from '@/components/ui/DateRangePicker.tsx';
import MetricItem from '@/components/ui/MetricItem.tsx';
import Spinner from '@/components/ui/Spinner.tsx';
import { Container, Flex, Grid, Stack } from '@/components/ui/layout';
import { useOrganizationStatistics } from '@/hooks/api/useAnalyticsAPI.ts';
import { useOrganization } from '@/hooks/api/useOrganizationsAPI.ts';
import { useProposalsForOrganization } from '@/hooks/api/useProposalsAPI.ts';
import { useTranslation } from '@/hooks/useI18n.tsx';
import { useNavigation } from '@/hooks/useNavigation.tsx';
import {
  Activity,
  BarChart3,
  Briefcase,
  DollarSign,
  Leaf,
  MapPin,
  Target,
  TrendingUp,
} from 'lucide-react';
import { useEffect, useMemo, useState } from 'react';
import { useNavigate, useParams } from 'react-router-dom';
import { formatCurrency, formatNumber } from '../lib/fin';

const OrganizationDashboardPage = () => {
  const { id } = useParams<{ id: string }>();
  const navigate = useNavigate();
  const { t } = useTranslation();
  const { handleFooterNavigate } = useNavigation();

  // Fetch organization data
  const { data: organization, isLoading: isLoadingOrg } = useOrganization(id);
  const { data: stats, isLoading: isLoadingStats } = useOrganizationStatistics(id);
  const { data: proposalsData } = useProposalsForOrganization(id);
  const [dateRange, setDateRange] = useState<DateRange>({
    startDate: null,
    endDate: null,
    preset: '30d',
  });

  useEffect(() => {
    if (!isLoadingOrg && !organization) {
      navigate('/map');
    }
  }, [organization, isLoadingOrg, navigate]);

  // use central fin utilities

  // Calculate proposals summary
  const proposalsSummary = useMemo(() => {
    const incoming = Array.isArray(proposalsData?.incoming) ? proposalsData.incoming : [];
    const outgoing = Array.isArray(proposalsData?.outgoing) ? proposalsData.outgoing : [];
    const pendingIncoming = incoming.filter((p) => p?.status === 'pending');
    const pendingOutgoing = outgoing.filter((p) => p?.status === 'pending');

    return {
      total: incoming.length + outgoing.length,
      incoming: incoming.length,
      outgoing: outgoing.length,
      pending: pendingIncoming.length + pendingOutgoing.length,
      pendingIncoming: pendingIncoming.length,
      pendingOutgoing: pendingOutgoing.length,
    };
  }, [proposalsData]);

  const isLoading = isLoadingOrg || isLoadingStats;

  if (isLoading) {
    return (
      <MainLayout onNavigate={handleFooterNavigate} className="bg-muted/30">
        <Container size="2xl" className="py-8 sm:py-12">
          <div className="flex items-center justify-center py-20">
            <Spinner className="h-8 w-8 text-primary" />
          </div>
        </Container>
      </MainLayout>
    );
  }

  if (!organization) {
    return null;
  }

  return (
    <MainLayout onNavigate={handleFooterNavigate} className="bg-muted/30">
      <Container size="2xl" className="py-8 sm:py-12">
        <Flex align="center" justify="between" className="mb-6">
          <PageHeader
            title={t('organizationDashboard.title', `${organization.Name} - Dashboard`)}
            subtitle={t(
              'organizationDashboard.subtitle',
              "Overview of your organization's performance and activity"
            )}
            onBack={() => navigate(`/organization/${id}`)}
          />
          <DateRangePicker value={dateRange} onChange={setDateRange} />
        </Flex>

        <Stack spacing="2xl">
          {/* Organization Statistics */}
          <OrganizationStatistics organizationId={id!} />

          {/* Key Metrics Overview */}
          {stats && (
            <Grid cols={{ md: 2, lg: 4 }} gap="md">
              <MetricItem
                icon={<MapPin className="h-4 h-5 text-current text-warning w-4 w-5" />}
                label={t('organizationDashboard.totalSites')}
                value={formatNumber(stats.total_sites)}
              />
              <MetricItem
                icon={<Target className="h-4 h-5 text-current text-success w-4 w-5" />}
                label={t('organizationDashboard.resourceFlows')}
                value={formatNumber(stats.total_resource_flows)}
              />
              <MetricItem
                icon={<Activity className="h-4 h-5 text-current text-primary w-4 w-5" />}
                label={t('organizationDashboard.activeMatches')}
                value={formatNumber(stats.active_matches)}
              />
              <MetricItem
                icon={<TrendingUp className="h-4 h-5 text-current text-purple-500 w-4 w-5" />}
                label={t('organizationDashboard.totalMatches')}
                value={formatNumber(stats.total_matches)}
              />
            </Grid>
          )}

          {/* Impact Metrics */}
          {stats && (stats.co2_savings_tonnes > 0 || stats.economic_value_eur > 0) && (
            <Grid cols={{ md: 2 }} gap="md">
              <Card>
                <CardHeader className="pb-3">
                  <div className="flex items-center gap-2">
                    <Leaf className="h-4 w-4 text-green-600" />
                    <CardTitle className="text-sm font-medium text-muted-foreground">
                      {t('organizationDashboard.co2Saved')}
                    </CardTitle>
                  </div>
                </CardHeader>
                <CardContent>
                  <div className="text-2xl font-bold text-green-600">
                    {formatNumber(stats.co2_savings_tonnes)} {t('common.tonnes')}
                  </div>
                  <p className="text-xs text-muted-foreground mt-1">
                    {t('organizationDashboard.totalSavings')}
                  </p>
                </CardContent>
              </Card>

              <Card>
                <CardHeader className="pb-3">
                  <div className="flex items-center gap-2">
                    <DollarSign className="h-4 text-current text-success w-4" />
                    <CardTitle className="text-sm font-medium text-muted-foreground">
                      {t('organizationDashboard.economicValue')}
                    </CardTitle>
                  </div>
                </CardHeader>
                <CardContent>
                  <div className="text-2xl font-bold text-success">
                    {formatCurrency(stats.economic_value_eur)}
                  </div>
                  <p className="text-xs text-muted-foreground mt-1">
                    {t('organizationDashboard.totalValue')}
                  </p>
                </CardContent>
              </Card>
            </Grid>
          )}

          {/* Proposals Summary */}
          {proposalsSummary.total > 0 && (
            <Card>
              <CardHeader>
                <Flex align="center" justify="between">
                  <CardTitle>{t('organizationDashboard.proposals')}</CardTitle>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={() => navigate(`/organization/${id}`)}
                  >
                    {t('organizationDashboard.viewAll')}
                  </Button>
                </Flex>
              </CardHeader>
              <CardContent>
                <Grid cols={{ md: 3 }} gap="md">
                  <div className="text-center p-4 border rounded-lg">
                    <div className="text-2xl font-bold mb-1">{proposalsSummary.total}</div>
                    <p className="text-sm text-muted-foreground">
                      {t('organizationDashboard.totalProposals')}
                    </p>
                  </div>
                  <div className="text-center p-4 border rounded-lg">
                    <div className="text-2xl font-bold text-warning mb-1">
                      {proposalsSummary.pending}
                    </div>
                    <p className="text-sm text-muted-foreground">
                      {t('organizationDashboard.pendingProposals')}
                    </p>
                  </div>
                  <div className="text-center p-4 border rounded-lg">
                    <div className="text-2xl font-bold text-success mb-1">
                      {proposalsSummary.incoming}
                    </div>
                    <p className="text-sm text-muted-foreground">
                      {t('organizationDashboard.incomingProposals')}
                    </p>
                  </div>
                </Grid>
              </CardContent>
            </Card>
          )}

          {/* Resource Flows */}
          <Card>
            <CardHeader>
              <Flex align="center" justify="between">
                <CardTitle>{t('organizationDashboard.resourceFlows')}</CardTitle>
                <Button variant="outline" size="sm" onClick={() => navigate(`/organization/${id}`)}>
                  {t('organizationDashboard.viewDetails')}
                </Button>
              </Flex>
            </CardHeader>
            <CardContent>
              <ResourceFlowList organizationId={id!} />
            </CardContent>
          </Card>

          {/* Quick Actions */}
          <Card>
            <CardHeader>
              <CardTitle>{t('organizationDashboard.quickActions')}</CardTitle>
            </CardHeader>
            <CardContent>
              <Grid cols={{ sm: 2, md: 4 }} gap="md">
                <Button
                  variant="outline"
                  onClick={() => navigate(`/organization/${id}`)}
                  className="h-20 flex flex-col items-center justify-center gap-2 hover:bg-primary/5"
                >
                  <Briefcase className="h-4 h-6 text-current w-4 w-6" />
                  <span className="text-sm">{t('organizationDashboard.viewOrganization')}</span>
                </Button>

                <Button
                  variant="outline"
                  onClick={() => navigate('/resources')}
                  className="h-20 flex flex-col items-center justify-center gap-2 hover:bg-primary/5"
                >
                  <Target className="h-4 h-6 text-current w-4 w-6" />
                  <span className="text-sm">{t('organizationDashboard.manageResources')}</span>
                </Button>

                <Button
                  variant="outline"
                  onClick={() => navigate('/matching')}
                  className="h-20 flex flex-col items-center justify-center gap-2 hover:bg-primary/5"
                >
                  <BarChart3 className="h-4 h-6 text-current w-4 w-6" />
                  <span className="text-sm">{t('organizationDashboard.findMatches')}</span>
                </Button>

                <Button
                  variant="outline"
                  onClick={() => navigate('/map')}
                  className="h-20 flex flex-col items-center justify-center gap-2 hover:bg-primary/5"
                >
                  <MapPin className="h-4 h-6 text-current w-4 w-6" />
                  <span className="text-sm">{t('organizationDashboard.exploreMap')}</span>
                </Button>
              </Grid>
            </CardContent>
          </Card>
        </Stack>
      </Container>
    </MainLayout>
  );
};

export default OrganizationDashboardPage;