"use client";
/* Delivery round — everything waiting, grouped by ward, handed over on the floor with a signature.
   Reuses the same signature pad and photo upload as the desktop, so a handover looks identical
   in the record whichever screen recorded it. */
import { useMemo, useRef, useState } from "react";
import { useSnap } from "@/lib/client";
import { daysBetween, itemMap, label, staffMap, staffName, type PickupRec } from "@/lib/compute";
import { uploadPhoto } from "@/lib/photo";
import { SignaturePad } from "@/components/dialogs";
import { INK, MBar, MBody, MEmpty, MError, MNav, MRow, MRule, MSection, MTop, inputStyle } from "@/components/m";

export default function MRounds() {
  const { s, mutate, busy } = useSnap();
  const [pick, setPick] = useState<PickupRec | null>(null);
  const [name, setName] = useState("");
  const [err, setErr] = useState("");
  const [saving, setSaving] = useState(false);
  const pad = useRef<{ clear: () => void; dataUrl: () => string | null } | null>(null);

  const byId = useMemo(() => itemMap(s), [s]);
  const staffById = useMemo(() => staffMap(s), [s]);

  /* Grouped by ward — a round is walked ward by ward, not order by order. */
  const wards = useMemo(() => {
    const m: Record<string, PickupRec[]> = {};
    for (const p of s.pickups) {
      if (p.pickedUp) continue;
      const w = staffById[p.staffId]?.dept || "No ward recorded";
      (m[w] ||= []).push(p);
    }
    return Object.entries(m).sort((a, b) => a[0].localeCompare(b[0]));
  }, [s, staffById]);

  const items = (p: PickupRec) => p.lines.map((l) => `${label(byId[l.itemId])} ${l.size}${l.qty > 1 ? ` ×${l.qty}` : ""}`).join(", ");

  const deliver = async () => {
    if (!pick || saving) return;
    setSaving(true); setErr("");
    let sigId: string | null = null;
    const png = pad.current?.dataUrl() || null;
    if (png) {
      const up = await uploadPhoto(mutate, "sig", png);
      if ("error" in up) { setSaving(false); setErr(up.error); return; }
      sigId = up.id;
    }
    const r = await mutate("pickup.deliver", { id: pick.id, deliveredTo: name.trim(), sigId });
    setSaving(false);
    if (!r.ok) { setErr(r.error); return; }
    setPick(null); setName("");
  };

  const total = wards.reduce((t, [, ps]) => t + ps.length, 0);

  if (pick) {
    const st = staffById[pick.staffId];
    return (
      <>
        <MTop title="Hand over" back onBack={() => setPick(null)} right={st?.dept || undefined} />
        <MRule />
        <MError msg={err} onDismiss={() => setErr("")} />
        <MBody>
          <section style={{ background: INK, color: "var(--color-bg)", padding: "18px 16px" }}>
            <div style={{ fontSize: 12, fontWeight: 600, letterSpacing: "0.12em", textTransform: "uppercase", color: "var(--color-accent-300)" }}>{pick.orderCode}</div>
            <div style={{ fontFamily: "var(--font-heading)", fontWeight: 800, fontSize: 26, letterSpacing: "-0.02em", marginTop: 8 }}>{staffName(st, "Staff member")}</div>
            <div style={{ fontSize: 13.5, color: "var(--color-neutral-400)", marginTop: 8 }}>{items(pick)}</div>
          </section>

          <MSection label="Received by" />
          <div style={{ padding: 16 }}>
            <input value={name} onChange={(e) => setName(e.target.value)} placeholder="Name of whoever signs, e.g. the manager" aria-label="Received by" style={inputStyle} />
            <div style={{ fontSize: 11, fontWeight: 600, letterSpacing: "0.1em", textTransform: "uppercase", color: "var(--color-neutral-600)", marginTop: 18, marginBottom: 8 }}>Signature</div>
            <SignaturePad onReady={(api) => { pad.current = api; }} />
            <button onClick={() => pad.current?.clear()} style={{ marginTop: 10, background: "none", border: 0, padding: 0, color: "var(--color-accent-700)", fontSize: 14, fontWeight: 600, textDecoration: "underline", textUnderlineOffset: 3, cursor: "pointer" }}>Clear the signature</button>
            <p style={{ fontSize: 13.5, color: "var(--color-neutral-700)", marginTop: 18, lineHeight: 1.6 }}>
              Handing over records the garments as collected — the same as a pickup at the counter — and keeps the name and signature with the record.
            </p>
          </div>
        </MBody>
        <MBar label={saving ? "Recording…" : "Delivered"} glyph="check" onClick={deliver} disabled={saving || busy} />
      </>
    );
  }

  return (
    <>
      <MTop title="Round" back right={total ? `${total} to drop off` : undefined} />
      <MRule />
      <MBody>
        {total === 0 ? (
          <MEmpty title="Nothing to deliver" sub="Everything that has come in has been collected or handed over." />
        ) : wards.map(([ward, ps]) => (
          <div key={ward}>
            <MSection label={ward} right={`${ps.length} order${ps.length === 1 ? "" : "s"}`} />
            {ps.map((p) => {
              const st = staffById[p.staffId];
              const days = daysBetween(p.received, s.today);
              return (
                <MRow key={p.id} onClick={() => { setPick(p); setName(""); }} mark={days > 10 ? "accent" : "ink"} attention={days > 10}
                  title={staffName(st, "Staff member")}
                  sub={`${items(p)} · waiting ${days}d`}
                  right={<span style={{ fontFamily: "var(--font-heading)", fontWeight: 800, fontSize: 13, letterSpacing: "0.08em", textTransform: "uppercase" }}>Sign</span>} />
              );
            })}
          </div>
        ))}
      </MBody>
      <MNav />
    </>
  );
}