import type { SiteUserDataPoint } from "@umt/contracts";
import { useState } from "react";
import { CartesianGrid, Line, LineChart, ResponsiveContainer, Tooltip, XAxis, YAxis } from "recharts";
import { Button } from "~/components/ui/button.tsx";
import { formatBytes } from "~/lib/utils.ts";
import { ratioText } from "./site-fields.ts";

// 用户数据 30 天折线。主色无彩(interface-materials §1):系列靠明暗 + 实线 / 虚线区分,不用色相;
// 字节与分享率量纲不同,分两张图,不做双轴。

const INK = "var(--foreground)";
const INK_2 = "var(--muted-foreground)";
const GRID = "var(--border)";

type Row = { day: string; upload: number; download: number; ratio: number | null };

const dayLabel = (d: string) => d.slice(5).replace("-", "/");

function Legend({ items }: { items: { label: string; dashed?: boolean; muted?: boolean }[] }) {
  return (
    <ul className="flex flex-wrap gap-x-4 gap-y-1 text-meta text-muted-foreground">
      {items.map((i) => (
        <li key={i.label} className="flex items-center gap-1.5">
          <svg width="18" height="6" aria-hidden className="shrink-0">
            <line
              x1="1"
              y1="3"
              x2="17"
              y2="3"
              stroke={i.muted ? INK_2 : INK}
              strokeWidth="2"
              strokeLinecap="round"
              strokeDasharray={i.dashed ? "4 3" : undefined}
            />
          </svg>
          {i.label}
        </li>
      ))}
    </ul>
  );
}

function TipBox({
  active,
  payload,
  label,
  kind,
}: {
  active?: boolean;
  payload?: { payload: Row }[];
  label?: string;
  kind: "bytes" | "ratio";
}) {
  const row = payload?.[0]?.payload;
  if (!active || !row) return null;
  return (
    <div className="pg-float rounded-lg px-3 py-2 text-meta">
      <p className="mb-1 font-medium text-foreground">{label}</p>
      {kind === "bytes" ? (
        <>
          <p className="text-muted-foreground">
            上传 <span className="text-foreground tabular-nums">{formatBytes(row.upload)}</span>
          </p>
          <p className="text-muted-foreground">
            下载 <span className="text-foreground tabular-nums">{formatBytes(row.download)}</span>
          </p>
        </>
      ) : (
        <p className="text-muted-foreground">
          分享率 <span className="text-foreground tabular-nums">{ratioText(row)}</span>
        </p>
      )}
    </div>
  );
}

const axisProps = {
  stroke: GRID,
  tick: { fill: "var(--muted-foreground)", fontSize: 11 },
  tickLine: false,
  axisLine: false,
} as const;

export function UserDataChart({ points }: { points: SiteUserDataPoint[] }) {
  const [table, setTable] = useState(false);
  const rows: Row[] = [...points]
    .sort((a, b) => a.day.localeCompare(b.day))
    .map((p) => ({ day: dayLabel(p.day), upload: p.upload, download: p.download, ratio: p.ratio }));

  if (rows.length < 2)
    return (
      <p className="py-6 text-center text-caption text-muted-foreground">
        {rows.length ? "只有 1 天的数据,满 2 天后显示趋势" : "还没有历史数据。刷新登录成功后每天记一次"}
      </p>
    );

  return (
    <div className="space-y-5">
      <figure className="min-w-0">
        <figcaption className="mb-2 flex flex-wrap items-center justify-between gap-2">
          <span className="text-caption font-medium text-foreground">上传 / 下载</span>
          <Legend items={[{ label: "上传" }, { label: "下载", dashed: true, muted: true }]} />
        </figcaption>
        <div className="h-48 w-full">
          <ResponsiveContainer width="100%" height="100%">
            <LineChart data={rows} margin={{ top: 6, right: 8, bottom: 0, left: 0 }}>
              <CartesianGrid stroke={GRID} strokeDasharray="0" vertical={false} />
              <XAxis dataKey="day" {...axisProps} minTickGap={24} />
              <YAxis {...axisProps} width={64} tickFormatter={(v: number) => formatBytes(v, 0)} />
              <Tooltip
                cursor={{ stroke: INK_2, strokeWidth: 1 }}
                content={(p) => <TipBox {...(p as object)} kind="bytes" />}
              />
              <Line
                type="monotone"
                dataKey="upload"
                name="上传"
                stroke={INK}
                strokeWidth={2}
                dot={false}
                activeDot={{ r: 4, stroke: "var(--background)", strokeWidth: 2, fill: INK }}
                isAnimationActive={false}
              />
              <Line
                type="monotone"
                dataKey="download"
                name="下载"
                stroke={INK_2}
                strokeWidth={2}
                strokeDasharray="5 4"
                dot={false}
                activeDot={{ r: 4, stroke: "var(--background)", strokeWidth: 2, fill: INK_2 }}
                isAnimationActive={false}
              />
            </LineChart>
          </ResponsiveContainer>
        </div>
      </figure>

      <figure className="min-w-0">
        <figcaption className="mb-2 text-caption font-medium text-foreground">分享率</figcaption>
        <div className="h-32 w-full">
          <ResponsiveContainer width="100%" height="100%">
            <LineChart data={rows} margin={{ top: 6, right: 8, bottom: 0, left: 0 }}>
              <CartesianGrid stroke={GRID} vertical={false} />
              <XAxis dataKey="day" {...axisProps} minTickGap={24} />
              <YAxis {...axisProps} width={64} domain={["auto", "auto"]} tickFormatter={(v: number) => v.toFixed(1)} />
              <Tooltip
                cursor={{ stroke: INK_2, strokeWidth: 1 }}
                content={(p) => <TipBox {...(p as object)} kind="ratio" />}
              />
              <Line
                type="monotone"
                dataKey="ratio"
                name="分享率"
                stroke={INK}
                strokeWidth={2}
                dot={false}
                connectNulls
                activeDot={{ r: 4, stroke: "var(--background)", strokeWidth: 2, fill: INK }}
                isAnimationActive={false}
              />
            </LineChart>
          </ResponsiveContainer>
        </div>
      </figure>

      <div>
        <Button variant="ghost" size="xs" onClick={() => setTable((t) => !t)} aria-expanded={table}>
          {table ? "收起数据表" : "查看数据表"}
        </Button>
        {table ? (
          <div className="mt-2 max-h-64 overflow-auto rounded-lg border border-border/60">
            <table className="w-full text-meta tabular-nums">
              <thead className="sticky top-0 bg-background text-muted-foreground">
                <tr>
                  <th className="px-3 py-1.5 text-left font-medium">日期</th>
                  <th className="px-3 py-1.5 text-right font-medium">上传</th>
                  <th className="px-3 py-1.5 text-right font-medium">下载</th>
                  <th className="px-3 py-1.5 text-right font-medium">分享率</th>
                </tr>
              </thead>
              <tbody className="divide-y divide-border/60 text-foreground">
                {[...rows].reverse().map((r) => (
                  <tr key={r.day}>
                    <td className="px-3 py-1.5">{r.day}</td>
                    <td className="px-3 py-1.5 text-right">{formatBytes(r.upload)}</td>
                    <td className="px-3 py-1.5 text-right">{formatBytes(r.download)}</td>
                    <td className="px-3 py-1.5 text-right">{ratioText(r)}</td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        ) : null}
      </div>
    </div>
  );
}