'use client';

/**
 * Statements Dashboard — Statement processing status, amounts, and payee distribution.
 *
 * Displays:
 * - 5 KPI cards: total Statements, Draft count, Final count, Published count, total net payable
 * - Donut chart: by status (Draft, Final, Published) using PieChartWidget with innerRadius > 0
 * - Line chart: amounts over time (monthly net payable)
 * - Horizontal bar chart: top 10 Payees by net payable
 * - Bar chart: by currency
 * - DateRangeFilter
 *
 * Requirements: 12.1, 12.2, 12.3, 12.4, 12.5, 12.6, 12.7
 */

import { useStatementsData } from '@/lib/api/queries';
import { useTranslation } from '@/lib/hooks/useTranslation';
import { formatNumber } from '@/lib/utils/format';
import { useCurrencyFormatter, useCurrencyAxisFormatter } from '@/lib/hooks/useCurrencyFormatter';
import { chartColors } from '@/lib/constants/theme';
import DateRangeFilter from '@/components/dashboard/DateRangeFilter';
import KpiGrid from '@/components/dashboard/KpiGrid';
import KpiCard from '@/components/dashboard/KpiCard';
import ChartGrid from '@/components/dashboard/ChartGrid';
import ChartCard from '@/components/charts/ChartCard';
import PieChartWidget from '@/components/charts/PieChartWidget';
import LineChartWidget from '@/components/charts/LineChartWidget';
import BarChartWidget from '@/components/charts/BarChartWidget';

export default function StatementsPage() {
  const { data, isLoading } = useStatementsData();
  const t = useTranslation();
  const fmtCurrency = useCurrencyFormatter();
  const fmtAxis = useCurrencyAxisFormatter();

  if (isLoading || !data) {
    return (
      <div className="flex items-center justify-center h-64">
        <p className="text-divisi-text-secondary text-sm">{t.dashboard.loading}</p>
      </div>
    );
  }

  const { kpis, byStatus, amountsOverTime, topPayees, byCurrency } = data;

  return (
    <div className="space-y-6">
      {/* Date Range Filter */}
      <DateRangeFilter />

      {/* KPI Cards */}
      <KpiGrid>
        <KpiCard title={t.dashboard.totalStatements} value={formatNumber(kpis.totalStatements)} />
        <KpiCard title={t.dashboard.draft} value={formatNumber(kpis.draftCount)} />
        <KpiCard title={t.dashboard.final} value={formatNumber(kpis.finalCount)} />
        <KpiCard title={t.dashboard.published} value={formatNumber(kpis.publishedCount)} />
        <KpiCard title={t.dashboard.totalNetPayable} value={fmtCurrency(kpis.totalNetPayable)} />
      </KpiGrid>

      {/* Charts */}
      <ChartGrid>
        {/* Donut chart: by status */}
        <ChartCard title={t.dashboard.statementsByStatus}>
          <PieChartWidget data={byStatus} innerRadius={60} />
        </ChartCard>

        {/* Line chart: amounts over time */}
        <ChartCard title={t.dashboard.netPayableOverTime}>
          <LineChartWidget
            data={amountsOverTime}
            xKey="month"
            lines={[{ dataKey: 'value', color: chartColors.primary, name: t.dashboard.totalNetPayable }]}
            yAxisFormatter={fmtAxis}
          />
        </ChartCard>

        {/* Horizontal bar chart: top 10 Payees by net payable */}
        <ChartCard title={t.dashboard.top10PayeesByNetPayable}>
          <BarChartWidget
            data={topPayees}
            xKey="name"
            bars={[{ dataKey: 'value', color: chartColors.primary, name: t.dashboard.totalNetPayable }]}
            layout="horizontal"
            yAxisFormatter={fmtAxis}
          />
        </ChartCard>

        {/* Bar chart: by currency */}
        <ChartCard title={t.dashboard.statementsByCurrency}>
          <BarChartWidget
            data={byCurrency}
            xKey="name"
            bars={[{ dataKey: 'value', color: chartColors.primary, name: t.dashboard.totalStatements }]}
          />
        </ChartCard>
      </ChartGrid>
    </div>
  );
}