"use client";

import Link from "next/link";
import { CartesianGrid, Line, LineChart, XAxis, YAxis } from "recharts";
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import {
  ChartContainer,
  ChartLegend,
  ChartLegendContent,
  ChartTooltip,
  ChartTooltipContent,
  type ChartConfig,
} from "@/components/ui/chart";
import { tr } from "@/i18n/tr";
import { cn } from "@/lib/utils";
import { formatDate, formatMoney } from "@/shared/format";
import { cumulative, OVERVIEW_PERIODS, type OverviewPeriod } from "@/shared/overview";
import type { OverviewData } from "../service";

const t = tr.dashboard.overview;
export type OverviewView = "cumulative" | "periodic";

const compact = new Intl.NumberFormat("tr-TR", { notation: "compact", maximumFractionDigits: 1 });
const dayShort = new Intl.DateTimeFormat("tr-TR", { day: "numeric", month: "short" });
const weekdayShort = new Intl.DateTimeFormat("tr-TR", { weekday: "short", day: "numeric" });
const monthShort = new Intl.DateTimeFormat("tr-TR", { month: "short", year: "2-digit" });
const monthLong = new Intl.DateTimeFormat("tr-TR", { month: "long", year: "numeric" });

const config = {
  plannedIncome: { label: t.series.plannedIncome, color: "var(--income)" },
  budget: { label: t.series.budget, color: "var(--budget)" },
  actual: { label: t.series.actual, color: "var(--expense)" },
} satisfies ChartConfig;
const SERIES = ["plannedIncome", "budget", "actual"] as const;

const asDate = (key: string) =>
  new Date(key.length === 7 ? `${key}-15T12:00:00+03:00` : `${key}T12:00:00+03:00`);

function bucketLabel(key: string, period: OverviewPeriod) {
  const d = asDate(key);
  if (key.length === 7) return monthShort.format(d);
  return period === "week" ? weekdayShort.format(d) : dayShort.format(d);
}

/** Bölüm 6.13 ana çizgi grafik: periyot seçici ve kümülatif / dönemsel görünüm (URL'de). */
export function OverviewChart({ data, view }: { data: OverviewData; view: OverviewView }) {
  const points = view === "cumulative" ? cumulative(data.points) : data.points;
  const chart = points.map((p) => ({
    key: p.key,
    label: bucketLabel(p.key, data.period),
    plannedIncome: p.plannedIncome === null ? null : p.plannedIncome / 100,
    budget: p.budget === null ? null : p.budget / 100,
    actual: p.actual === null ? null : p.actual / 100,
  }));
  const hasGap = data.points.some((p) => p.budget === null);
  const href = (period: OverviewPeriod, v: OverviewView) =>
    `?periyot=${period}&gorunum=${v === "cumulative" ? "kumulatif" : "donemsel"}`;
  const rangeText =
    data.range.granularity === "month"
      ? `${monthLong.format(asDate(data.range.buckets[0]!))} – ${monthLong.format(asDate(data.range.buckets.at(-1)!))}`
      : `${formatDate(asDate(data.range.from))} – ${formatDate(asDate(data.range.to))}`;
  const pill = (active: boolean) =>
    cn(
      "rounded-md px-2.5 py-1 text-sm transition-colors focus-visible:ring-2 focus-visible:ring-ring focus-visible:outline-none",
      active
        ? "bg-background font-medium shadow-sm"
        : "text-muted-foreground hover:text-foreground",
    );

  return (
    <Card size="sm">
      <CardHeader className="flex flex-wrap items-start gap-3">
        <div className="min-w-0 flex-1">
          <CardTitle className="text-base">{t.title}</CardTitle>
          <CardDescription>{t.description(rangeText)}</CardDescription>
        </div>
        <div className="flex flex-wrap gap-2">
          <nav aria-label={t.periodLabel} className="flex rounded-lg bg-muted p-0.5">
            {OVERVIEW_PERIODS.map((p) => (
              <Link
                key={p}
                href={href(p, view)}
                scroll={false}
                replace
                aria-current={p === data.period ? "page" : undefined}
                className={pill(p === data.period)}
              >
                {t.periods[p]}
              </Link>
            ))}
          </nav>
          <nav aria-label={t.viewLabel} className="flex rounded-lg bg-muted p-0.5">
            {(["cumulative", "periodic"] as const).map((v) => (
              <Link
                key={v}
                href={href(data.period, v)}
                scroll={false}
                replace
                aria-current={v === view ? "page" : undefined}
                className={pill(v === view)}
              >
                {t.views[v]}
              </Link>
            ))}
          </nav>
        </div>
      </CardHeader>
      <CardContent className="flex flex-col gap-3">
        <ChartContainer
          config={config}
          className="aspect-auto h-64 w-full"
          aria-label={t.chartLabel}
          role="img"
        >
          <LineChart data={chart} margin={{ left: 4, right: 12, top: 8 }}>
            <CartesianGrid vertical={false} />
            <XAxis
              dataKey="label"
              tickLine={false}
              axisLine={false}
              tickMargin={8}
              minTickGap={16}
            />
            <YAxis
              tickLine={false}
              axisLine={false}
              width={48}
              tickFormatter={(v: number) => compact.format(v)}
            />
            <ChartTooltip
              content={
                <ChartTooltipContent
                  labelFormatter={(_, payload) => {
                    const key = payload?.[0]?.payload?.key as string | undefined;
                    if (!key) return "";
                    return key.length === 7
                      ? monthLong.format(asDate(key))
                      : formatDate(asDate(key));
                  }}
                  formatter={(value, name) => (
                    <div className="flex w-full items-center justify-between gap-3">
                      <span className="text-muted-foreground">
                        {config[name as keyof typeof config]?.label}
                      </span>
                      <span className="font-medium text-foreground tabular-nums">
                        {formatMoney(Math.round(Number(value) * 100))}
                      </span>
                    </div>
                  )}
                />
              }
            />
            <ChartLegend content={<ChartLegendContent />} />
            {SERIES.map((k) => (
              <Line
                key={k}
                dataKey={k}
                type="linear"
                stroke={`var(--color-${k})`}
                strokeWidth={2}
                strokeDasharray={k === "budget" ? "6 3" : undefined}
                dot={
                  data.range.granularity === "month" || data.period === "week" ? { r: 3 } : false
                }
                activeDot={{ r: 5 }}
                connectNulls={false}
                isAnimationActive={false}
              />
            ))}
          </LineChart>
        </ChartContainer>
        {hasGap ? <p className="text-xs text-muted-foreground">{t.noBudget}</p> : null}
        <details className="text-sm">
          <summary className="cursor-pointer text-xs text-muted-foreground">{t.table}</summary>
          <div className="mt-2 max-h-80 overflow-y-auto">
            <table className="w-full text-right tabular-nums">
              <thead className="sticky top-0 bg-card text-xs text-muted-foreground">
                <tr>
                  <th className="py-1 text-left font-normal">{t.bucket[data.range.granularity]}</th>
                  {SERIES.map((k) => (
                    <th key={k} className="py-1 font-normal">
                      {t.series[k]}
                    </th>
                  ))}
                </tr>
              </thead>
              <tbody className="divide-y">
                {points.map((p) => (
                  <tr key={p.key}>
                    <td className="py-1 text-left">
                      {p.key.length === 7
                        ? monthLong.format(asDate(p.key))
                        : formatDate(asDate(p.key))}
                    </td>
                    {SERIES.map((k) => (
                      <td key={k} className="py-1">
                        {p[k] === null ? "—" : formatMoney(p[k])}
                      </td>
                    ))}
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        </details>
      </CardContent>
    </Card>
  );
}