"use client";

import {
  CategoryPieChart,
  type CategoryChartData,
} from "@/components/statistics/category-pie-chart";
import type { BankingData } from "@/lib/types";

interface CategoryBreakdownProps {
  data: BankingData;
}

export function CategoryBreakdown({ data }: CategoryBreakdownProps) {
  // Get current month expenses by category
  const thisMonth = new Date();
  thisMonth.setDate(1);
  const thisMonthStr = thisMonth.toISOString().slice(0, 7);

  const monthExpenses = data.transactions.filter(
    (t) => t.date.startsWith(thisMonthStr) && t.amount < 0
  );

  const categoryTotals = new Map<string, number>();

  monthExpenses.forEach((t) => {
    const catId = t.categoryId || "uncategorized";
    const current = categoryTotals.get(catId) || 0;
    categoryTotals.set(catId, current + Math.abs(t.amount));
  });

  const chartData: CategoryChartData[] = Array.from(categoryTotals.entries())
    .map(([categoryId, total]) => {
      const category = data.categories.find((c) => c.id === categoryId);
      return {
        name: category?.name || "Non catégorisé",
        value: total,
        color: category?.color || "#94a3b8",
        icon: category?.icon || "HelpCircle",
      };
    })
    .sort((a, b) => b.value - a.value)
    .slice(0, 6);

  const formatCurrency = (value: number) => {
    return new Intl.NumberFormat("fr-FR", {
      style: "currency",
      currency: "EUR",
    }).format(value);
  };

  return (
    <CategoryPieChart
      data={chartData}
      formatCurrency={formatCurrency}
      title="Dépenses par catégorie"
      height={250}
      innerRadius={50}
      outerRadius={80}
      emptyMessage="Pas de données ce mois-ci"
    />
  );
}
