import { useMemo, useState } from "react";
import type { BashRun } from "@/lib/bridge";

type Filter = "recent" | "running" | "done" | "all";

type Props = {
  runs: BashRun[];
  onClose: () => void;
};

function fmtDur(r: BashRun): string {
  const end = r.ended_at ?? Date.now();
  const ms = Math.max(0, end - r.started_at);
  if (ms < 1000) return `${ms}ms`;
  if (ms < 60_000) return `${Math.round(ms / 1000)}秒`;
  return `${Math.floor(ms / 60_000)}分${Math.round((ms % 60_000) / 1000)}秒`;
}

export function BashPanel({ runs, onClose }: Props) {
  const [filter, setFilter] = useState<Filter>("recent");
  const [openId, setOpenId] = useState<string | null>(null);

  const list = useMemo(() => {
    const sorted = [...runs].sort((a, b) => b.started_at - a.started_at);
    if (filter === "all") return sorted;
    if (filter === "running") return sorted.filter((r) => r.status === "running");
    if (filter === "done")
      return sorted.filter((r) => r.status !== "running");
    return sorted.slice(0, 20);
  }, [runs, filter]);

  const running = runs.filter((r) => r.status === "running").length;

  return (
    <div className="work-panel bash-panel">
      <div className="work-panel-head">
        <strong>后台 Bash · {running} 运行中</strong>
        <button type="button" onClick={onClose}>
          关闭
        </button>
      </div>
      <div className="bash-filters">
        {(
          [
            ["recent", "最近"],
            ["running", "进行中"],
            ["done", "已完成"],
            ["all", "全部"],
          ] as const
        ).map(([k, label]) => (
          <button
            key={k}
            type="button"
            className={filter === k ? "active" : ""}
            onClick={() => setFilter(k)}
          >
            {label}
          </button>
        ))}
      </div>
      {list.length === 0 ? (
        <div className="work-empty">还没有 shell 工具记录。</div>
      ) : (
        <ul className="bash-list">
          {list.map((r) => (
            <li key={r.id} className={`bash-row ${r.status}`}>
              <button
                type="button"
                className="bash-row-main"
                onClick={() => setOpenId(openId === r.id ? null : r.id)}
              >
                <span className="bash-status" aria-hidden>
                  {r.status === "ok"
                    ? "✓"
                    : r.status === "running"
                      ? "…"
                      : "✕"}
                </span>
                <code className="bash-cmd">$ {r.command}</code>
                <span className="bash-dur">{fmtDur(r)}</span>
                <span className="bash-chev">{openId === r.id ? "▾" : "▸"}</span>
              </button>
              {openId === r.id && r.output ? (
                <pre className="bash-out">{r.output}</pre>
              ) : null}
            </li>
          ))}
        </ul>
      )}
    </div>
  );
}