fintrack/components/statistics/balance-line-chart.tsx

"use client";

import { useState } from "react";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Button } from "@/components/ui/button";
import { Layers, SplitSquareHorizontal } from "lucide-react";
import {
  LineChart,
  Line,
  XAxis,
  YAxis,
  CartesianGrid,
  Tooltip,
  ResponsiveContainer,
  Legend,
} from "recharts";
import type { Account } from "@/lib/types";

interface BalanceChartDataPoint {
  date: string;
  [key: string]: string | number;
}

interface BalanceLineChartProps {
  aggregatedData: BalanceChartDataPoint[];
  perAccountData: BalanceChartDataPoint[];
  accounts: Account[];
  formatCurrency: (amount: number) => string;
}

const ACCOUNT_COLORS = [
  "#6366f1", // indigo
  "#22c55e", // green
  "#f59e0b", // amber
  "#ef4444", // red
  "#8b5cf6", // violet
  "#06b6d4", // cyan
  "#ec4899", // pink
  "#84cc16", // lime
];

export function BalanceLineChart({
  aggregatedData,
  perAccountData,
  accounts,
  formatCurrency,
}: BalanceLineChartProps) {
  const [mode, setMode] = useState<"aggregated" | "split">("aggregated");
  const [hoveredAccount, setHoveredAccount] = useState<string | null>(null);

  const data = mode === "aggregated" ? aggregatedData : perAccountData;
  const hasData = data.length > 0;

  const getLineOpacity = (accountId: string) => {
    if (!hoveredAccount) return 1;
    return hoveredAccount === accountId ? 1 : 0.15;
  };

  return (
    <Card>
      <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
        <CardTitle>Évolution du solde</CardTitle>
        <div className="flex gap-1">
          <Button
            variant={mode === "aggregated" ? "default" : "ghost"}
            size="sm"
            onClick={() => setMode("aggregated")}
            title="Tous les comptes agrégés"
          >
            <Layers className="w-4 h-4" />
          </Button>
          <Button
            variant={mode === "split" ? "default" : "ghost"}
            size="sm"
            onClick={() => setMode("split")}
            title="Par compte"
          >
            <SplitSquareHorizontal className="w-4 h-4" />
          </Button>
        </div>
      </CardHeader>
      <CardContent>
        {hasData ? (
          <div className="h-[300px]">
            <ResponsiveContainer width="100%" height="100%">
              <LineChart data={data}>
                <CartesianGrid strokeDasharray="3 3" className="stroke-muted" />
                <XAxis
                  dataKey="date"
                  className="text-xs"
                  interval="preserveStartEnd"
                />
                <YAxis className="text-xs" tickFormatter={(v) => `${v}€`} />
                <Tooltip
                  formatter={(value: number) => formatCurrency(value)}
                  contentStyle={{
                    backgroundColor: "var(--card)",
                    border: "1px solid var(--border)",
                    borderRadius: "8px",
                  }}
                />
                {mode === "aggregated" ? (
                  <Line
                    type="monotone"
                    dataKey="solde"
                    name="Solde total"
                    stroke="#6366f1"
                    strokeWidth={2}
                    dot={false}
                  />
                ) : (
                  accounts.map((account, index) => (
                    <Line
                      key={account.id}
                      type="monotone"
                      dataKey={account.id}
                      name={account.name}
                      stroke={ACCOUNT_COLORS[index % ACCOUNT_COLORS.length]}
                      strokeWidth={hoveredAccount === account.id ? 3 : 2}
                      strokeOpacity={getLineOpacity(account.id)}
                      dot={false}
                    />
                  ))
                )}
                {mode === "split" && (
                  <Legend
                    content={({ payload }) => (
                      <div
                        className="flex flex-wrap justify-center gap-x-4 gap-y-1 mt-2"
                        onMouseLeave={() => setHoveredAccount(null)}
                      >
                        {payload?.map((entry, index) => {
                          const accountId = entry.dataKey as string;
                          const isHovered = hoveredAccount === accountId;
                          const isDimmed =
                            hoveredAccount && hoveredAccount !== accountId;
                          return (
                            <div
                              key={`legend-${index}`}
                              className="flex items-center gap-1.5 text-sm cursor-pointer transition-opacity"
                              style={{
                                opacity: isDimmed ? 0.3 : 1,
                              }}
                              onMouseEnter={() => setHoveredAccount(accountId)}
                            >
                              <div
                                className="w-3 h-3 rounded-full"
                                style={{
                                  backgroundColor: entry.color,
                                  transform: isHovered ? "scale(1.2)" : "scale(1)",
                                  transition: "transform 0.15s",
                                }}
                              />
                              <span className="text-foreground">
                                {entry.value}
                              </span>
                            </div>
                          );
                        })}
                      </div>
                    )}
                  />
                )}
              </LineChart>
            </ResponsiveContainer>
          </div>
        ) : (
          <div className="h-[300px] flex items-center justify-center text-muted-foreground">
            Pas de données pour cette période
          </div>
        )}
      </CardContent>
    </Card>
  );
}