"use client";

import {
  Bar,
  BarChart,
  CartesianGrid,
  Line,
  LineChart,
  ReferenceLine,
  XAxis,
  YAxis,
} from "recharts";
import {
  ChartContainer,
  ChartLegend,
  ChartLegendContent,
  ChartTooltip,
  ChartTooltipContent,
  type ChartConfig,
} from "@/components/ui/chart";
import { tr } from "@/i18n/tr";
import { cn } from "@/lib/utils";
import { formatMoney } from "@/shared/format";
import type { TrendReport } from "../service";
import { monthLabel, monthShort, formatPct } from "./report-frame";

const t = tr.reports.trend;
const compact = new Intl.NumberFormat("tr-TR", { notation: "compact", maximumFractionDigits: 1 });

const barConfig = {
  income: { label: t.income, color: "var(--income)" },
  expense: { label: t.expense, color: "var(--expense)" },
} satisfies ChartConfig;
const rateConfig = { rate: { label: t.savings, color: "var(--budget)" } } satisfies ChartConfig;

export function TrendView({ data }: { data: TrendReport }) {
  const chart = data.months.map((m) => ({
    month: m.month,
    label: monthShort(m.month),
    income: m.incomeMinor / 100,
    expense: m.expenseMinor / 100,
    // Devam eden ayın oranı (maaş henüz yatmamış olabilir) ölçeği bozmasın: grafikte yok.
    rate: m.month === data.currentMonth ? null : m.savingsPct,
  }));
  const moneyTip = (
    <ChartTooltipContent
      labelFormatter={(_, payload) => {
        const m = payload?.[0]?.payload?.month as string | undefined;
        return m ? monthLabel(m) : "";
      }}
      formatter={(value, name) => (
        <div className="flex w-full items-center justify-between gap-3">
          <span className="text-muted-foreground">
            {barConfig[name as keyof typeof barConfig]?.label}
          </span>
          <span className="font-medium text-foreground tabular-nums">
            {formatMoney(Math.round(Number(value) * 100))}
          </span>
        </div>
      )}
    />
  );

  return (
    <div className="flex flex-col gap-4">
      <div className="rounded-xl border bg-card p-4">
        <ChartContainer
          config={barConfig}
          className="aspect-auto h-64 w-full"
          role="img"
          aria-label={t.chartLabel}
        >
          <BarChart data={chart} margin={{ left: 4, right: 8, top: 8 }} barGap={2}>
            <CartesianGrid vertical={false} />
            <XAxis dataKey="label" tickLine={false} axisLine={false} tickMargin={8} />
            <YAxis
              tickLine={false}
              axisLine={false}
              width={48}
              tickFormatter={(v: number) => compact.format(v)}
            />
            <ChartTooltip content={moneyTip} />
            <ChartLegend content={<ChartLegendContent />} />
            <Bar
              dataKey="income"
              fill="var(--color-income)"
              radius={[4, 4, 0, 0]}
              isAnimationActive={false}
            />
            <Bar
              dataKey="expense"
              fill="var(--color-expense)"
              radius={[4, 4, 0, 0]}
              isAnimationActive={false}
            />
          </BarChart>
        </ChartContainer>
      </div>

      <div className="rounded-xl border bg-card p-4">
        <h2 className="text-sm font-medium">{t.rateTitle}</h2>
        <p className="mb-2 text-xs text-muted-foreground">
          {t.rateHint} {t.partialHint}
        </p>
        <ChartContainer
          config={rateConfig}
          className="aspect-auto h-40 w-full"
          role="img"
          aria-label={t.rateChartLabel}
        >
          <LineChart data={chart} margin={{ left: 4, right: 8, top: 8 }}>
            <CartesianGrid vertical={false} />
            <XAxis dataKey="label" tickLine={false} axisLine={false} tickMargin={8} />
            <YAxis
              tickLine={false}
              axisLine={false}
              width={40}
              tickFormatter={(v: number) => `%${v}`}
            />
            <ReferenceLine y={0} stroke="var(--border)" />
            <ChartTooltip
              content={
                <ChartTooltipContent
                  labelFormatter={(_, payload) => {
                    const m = payload?.[0]?.payload?.month as string | undefined;
                    return m ? monthLabel(m) : "";
                  }}
                  formatter={(value) => (
                    <span className="font-medium text-foreground tabular-nums">
                      {formatPct(Number(value))}
                    </span>
                  )}
                />
              }
            />
            <Line
              dataKey="rate"
              stroke="var(--color-rate)"
              strokeWidth={2}
              dot={{ r: 3 }}
              connectNulls={false}
              isAnimationActive={false}
            />
          </LineChart>
        </ChartContainer>
      </div>

      <div className="overflow-x-auto rounded-xl border bg-card">
        <table className="w-full min-w-[32rem] text-sm tabular-nums">
          <thead className="border-b text-xs text-muted-foreground">
            <tr>
              <th className="px-3 py-2 text-left font-normal">{t.month}</th>
              <th className="px-3 py-2 text-right font-normal">{t.income}</th>
              <th className="px-3 py-2 text-right font-normal">{t.expense}</th>
              <th className="px-3 py-2 text-right font-normal">{t.net}</th>
              <th className="px-3 py-2 text-right font-normal">{t.savings}</th>
            </tr>
          </thead>
          <tbody className="divide-y">
            {[...data.months].reverse().map((m) => (
              <tr key={m.month} className={cn(m.month === data.currentMonth && "bg-muted/40")}>
                <td className="px-3 py-1.5">
                  <span className="capitalize">{monthLabel(m.month)}</span>
                  {m.month === data.currentMonth ? (
                    <span className="ml-1 text-xs text-muted-foreground">({t.ongoing})</span>
                  ) : null}
                </td>
                <td className="px-3 py-1.5 text-right">{formatMoney(m.incomeMinor)}</td>
                <td className="px-3 py-1.5 text-right">{formatMoney(m.expenseMinor)}</td>
                <td className={cn("px-3 py-1.5 text-right", m.netMinor < 0 && "text-expense")}>
                  {m.netMinor < 0 ? "−" : ""}
                  {formatMoney(Math.abs(m.netMinor))}
                </td>
                <td className="px-3 py-1.5 text-right">{formatPct(m.savingsPct)}</td>
              </tr>
            ))}
          </tbody>
          <tfoot className="border-t font-medium">
            <tr>
              <td className="px-3 py-2">{t.total}</td>
              <td className="px-3 py-2 text-right">{formatMoney(data.totals.incomeMinor)}</td>
              <td className="px-3 py-2 text-right">{formatMoney(data.totals.expenseMinor)}</td>
              <td
                className={cn("px-3 py-2 text-right", data.totals.netMinor < 0 && "text-expense")}
              >
                {data.totals.netMinor < 0 ? "−" : ""}
                {formatMoney(Math.abs(data.totals.netMinor))}
              </td>
              <td className="px-3 py-2 text-right">{formatPct(data.totals.savingsPct)}</td>
            </tr>
          </tfoot>
        </table>
      </div>
    </div>
  );
}