"use client";

/**
 * "NEW · last 15 min" (server-26#238). The rail is worst-first, so a fresh
 * minor that is escalating sits under stale Majors; this lane is the
 * recency view of the same FILTERED incidents, newest first, with why each
 * one is here ("New", "↑ Major", "+1 stop", a priority keyword).
 *
 * Desktop: overlay at the map's top-left, right of the zoom stack and above
 * MapView's rail (the rail starts at top-[9.5rem], so the lane is capped
 * just short of it and its rows scroll). The Gate A notice is pinned below
 * the rows, never inside the scroll area — same rule as the rail (#46).
 * Mobile: a compact chip under MapView's centred "Live" chip (same top-3
 * centre slot would cover it), right of the fit-all button; it expands.
 * Hidden when there is nothing new.
 */
import { useState } from "react";
import type { LaneEntry } from "@/lib/attention";
import { SEVERITY_COLORS, isKnownSeverity } from "@/lib/severity";
import { MachineOutputNotice } from "@/components/ui/MachineOutputNotice";

function ago(at: number, now: number): string {
  const m = Math.max(0, Math.floor((now - at) / 60_000));
  return m < 1 ? "now" : `${m}m`;
}

function Row({ e, now, onSelect }: { e: LaneEntry; now: number; onSelect: (id: string) => void }) {
  const color = isKnownSeverity(e.severity) ? SEVERITY_COLORS[e.severity] : "var(--ink-muted)";
  const body = (
    <>
      <span className="w-1 self-stretch rounded-full shrink-0" style={{ background: color }} aria-hidden="true" />
      <span className="min-w-0 flex-1 truncate text-ink">{e.title}</span>
      <span className="shrink-0 px-1 rounded bg-accent/15 text-accent font-semibold">{e.reason}</span>
      <span className="shrink-0 tabular-nums text-ink-muted">{ago(e.at, now)}</span>
    </>
  );
  const cls = "w-full flex items-center gap-1.5 px-1.5 py-1 rounded text-xs text-left";
  return (
    <li>
      {e.incidentId ? (
        <button type="button" className={`${cls} hover:bg-raised`} onClick={() => onSelect(e.incidentId!)}
          title={`${e.title} — ${e.reason}`}>
          {body}
        </button>
      ) : (
        <div className={cls} title={`${e.title} — ${e.reason} (call not linked to an incident yet)`}>{body}</div>
      )}
    </li>
  );
}

export function NewLane({ entries, now, onSelect }: { entries: LaneEntry[]; now: number; onSelect: (id: string) => void }) {
  const [open, setOpen] = useState(false);
  if (!entries.length) return null;
  const notice = <MachineOutputNotice variant="inline" className="text-[10px] leading-snug items-start px-1.5 pt-1" />;
  return (
    <>
      <section aria-label="New in the last 15 minutes"
        className="absolute top-3 left-14 z-[1002] hidden md:flex flex-col w-56 max-h-[8.5rem] bg-surface/90 backdrop-blur-sm border border-accent/60 rounded-lg shadow pointer-events-auto">
        <h2 className="shrink-0 px-2 pt-1.5 text-[10px] font-semibold uppercase tracking-wide text-accent">
          New · last 15 min <span className="text-ink-muted font-normal">({entries.length})</span>
        </h2>
        <ul className="min-h-0 overflow-y-auto px-0.5">
          {entries.map((e) => <Row key={e.key} e={e} now={now} onSelect={onSelect} />)}
        </ul>
        <div className="shrink-0 border-t border-line pb-1">{notice}</div>
      </section>

      <div className="absolute top-[5.25rem] left-14 z-[1002] md:hidden flex flex-col items-start">
        <button type="button" aria-expanded={open} onClick={() => setOpen((v) => !v)}
          className="bg-surface/95 border border-accent/60 rounded-full px-3 py-1 text-xs text-accent font-semibold whitespace-nowrap shadow">
          ● {entries.length} new · 15 min {open ? "▴" : "▾"}
        </button>
        {open && (
          <div className="mt-1 w-64 max-w-[calc(100vw-4.5rem)] bg-surface/95 border border-line rounded-lg shadow p-0.5 flex flex-col">
            <ul className="max-h-40 overflow-y-auto">
              {entries.map((e) => (
                <Row key={e.key} e={e} now={now} onSelect={(id) => { setOpen(false); onSelect(id); }} />
              ))}
            </ul>
            <div className="shrink-0 border-t border-line pb-1">{notice}</div>
          </div>
        )}
      </div>
    </>
  );
}