import { useState } from "react";
import { ApiError } from "../api/client";
import { packetsApi } from "../api/packets";
import type { PacketRead, Weld, WeldBody } from "../api/types";
import type { ReasonOptions } from "../components/ReasonSheet";
import { errorText } from "../lib/format";
import { voidText } from "../lib/voidStamp";
import { weldId, weldSummary } from "../lib/weldDefaults";
import type { Write, WriteResult } from "../warehouse/PullTable";
import { MapViewer } from "./MapViewer";
import { openPrint } from "./closeUtil";
import { WeldMark, type MarkMove } from "./marks";
import { landingPage, pageLabel, usePeople, viewPages } from "./shopUtil";
import { useSerial } from "./useSerial";
import { WeldRecord } from "./WeldRecord";
import { WeldSheet, type NewWeldAt } from "./WeldSheet";
import type { Mutate } from "./tabs";

const rv = (cur: PacketRead, no: number, fallback: number) => cur.welds.find((w) => w.weld_no === no)?.row_version ?? fallback;

function WeldRow({ w, onOpen }: { w: Weld; onOpen: (w: Weld) => void }) {
  return (
    <button type="button" className="row rowbtn" onClick={() => onOpen(w)} aria-label={`Open weld ${weldId(w)}`}>
      <span className={`balloon pinkb${w.carried ? " carried" : ""}`}>{w.weld_no}</span>
      <span className="d">
        {weldSummary(w)}
        <div className="small muted mono">
          {w.wo_base ?? "-"} #{w.piece ?? 1} · {w.process ?? "-"} · {w.stamp ?? ""}
        </div>
      </span>
      <span />
    </button>
  );
}

/**
 * The weld map: the drawing with the welds of the open sheet as pink leader marks. "Mark a weld" turns on
 * marking; a tap on the joint opens the weld sheet. Bubbles and arrows drag when the user may edit welds.
 */
export function WeldMapTab({
  p,
  write,
  mutate,
  reload,
  askReason,
  sub,
  myId,
  onError,
}: {
  p: PacketRead;
  write: Write;
  mutate: Mutate;
  reload: () => Promise<void>;
  askReason: (o: ReasonOptions) => Promise<string | null>;
  sub: string;
  myId: string | null;
  onError: (text: string) => void;
}) {
  const pages = viewPages(p.pages);
  const [picked, setPicked] = useState<{ n: number; onPurpose: boolean } | null>(null);
  const page = landingPage(pages, picked?.n ?? null, picked?.onPurpose ?? false);
  const [marking, setMarking] = useState(false);
  const [sheet, setSheet] = useState<{ weldNo: number | null; at: NewWeldAt | null } | null>(null);
  const serial = useSerial(p, write);
  const { people } = usePeople(p.dept.code);
  const myStamp = people.find((x) => x.id === myId)?.stamp ?? null;

  if (!page) return <div className="empty">No drawing pages in this packet.</div>;

  const isVoid = !!page.void;
  const canEdit = p.can.includes("edit_welds");
  const editable = canEdit && !isVoid;
  const onSheet = p.welds.filter((w) => w.page === page.n);
  const current = onSheet.filter((w) => !w.carried);
  const carried = onSheet.filter((w) => w.carried);
  const vText = isVoid ? voidText(page, p.pages) : "";
  const open = sheet ? (sheet.weldNo !== null ? (p.welds.find((w) => w.weld_no === sheet.weldNo) ?? null) : null) : null;

  const done = async (r: WriteResult): Promise<boolean> => {
    if (r.ok) return true;
    if (r.err !== undefined) {
      if (r.err instanceof ApiError && (r.err.status === 409 || r.err.status === 412)) await reload();
      onError(errorText(r.err));
    }
    return false;
  };

  const add = async (body: WeldBody) => {
    if (await done(await serial((cur, g) => packetsApi.addWeld(cur.id, body, g)))) {
      setSheet(null);
      setMarking(false);
    }
  };

  const save = async (w: Weld, body: WeldBody) => {
    if (await done(await serial((cur, g) => packetsApi.patchWeld(cur.id, w.weld_no, rv(cur, w.weld_no, w.row_version), body, g)))) setSheet(null);
  };

  const remove = async (w: Weld) => {
    const reason = await askReason({
      title: `Remove weld ${weldId(w)}`,
      sub,
      note: "The weld leaves the weld map. It stays in the record with your reason.",
      min: 3,
      danger: true,
      submitLabel: "Remove weld",
    });
    if (reason === null) return;
    if (await done(await serial((cur, g) => packetsApi.removeWeld(cur.id, w.weld_no, rv(cur, w.weld_no, w.row_version), { reason, ...g })))) setSheet(null);
  };

  const move = (w: Weld, m: MarkMove) =>
    serial((cur, g) =>
      packetsApi.patchWeld(
        cur.id,
        w.weld_no,
        rv(cur, w.weld_no, w.row_version),
        m.bubble ? { bfx: m.bfx, bfy: m.bfy } : { fx: m.fx, fy: m.fy, bfx: m.bfx, bfy: m.bfy },
        g,
      ),
    ).then(done);

  const markBtn = editable ? (
    <button
      type="button"
      className={marking ? "btn pink" : "btn pri"}
      aria-pressed={marking}
      onClick={() => setMarking((v) => !v)}
    >
      {marking ? "Cancel marking" : "Mark a weld"}
    </button>
  ) : null;

  return (
    <div className="stack">
      {isVoid ? (
        <div className="callout warn flush">
          <b>VOID copy, not for fabrication.</b> {vText}. Kept for the record with its weld marks.{" "}
          {page.void?.new_n ? (
            <button className="btn sm" type="button" onClick={() => setPicked({ n: page.void?.new_n ?? page.n, onPurpose: false })}>
              Go to the current sheet
            </button>
          ) : null}
        </div>
      ) : null}
      <div className="pagesel">
        {pages.length > 1 ? (
          <div className="chips" role="group" aria-label="Sheets">
            {pages.map((x) => (
              <button
                key={x.n}
                type="button"
                className={`btn sm${x.n === page.n ? " pri" : ""}${x.void ? " voidbtn" : ""}`}
                aria-pressed={x.n === page.n}
                onClick={() => setPicked({ n: x.n, onPurpose: true })}
              >
                {pageLabel(x)}
              </button>
            ))}
          </div>
        ) : (
          <span className="mono small muted">{pageLabel(page)}</span>
        )}
        {markBtn}
        {marking ? <span className="small">Tap the weld location on the drawing.</span> : null}
        {!canEdit ? (
          <span className="small muted">
            {p.welds.length} weld{p.welds.length === 1 ? "" : "s"} recorded
          </span>
        ) : null}
        {!p.removed ? (
          <button className="btn sm" type="button" onClick={() => openPrint(p.id, "map-w", { sheet: page.n })}>
            Print this sheet
          </button>
        ) : null}
      </div>
      <div className="dv">
        <MapViewer
          page={page}
          voidLabel={vText}
          mode={marking && editable ? "marking" : ""}
          label="Weld map"
          onTap={(fx, fy) => {
            if (marking && editable) setSheet({ weldNo: null, at: { page: page.n, fx, fy } });
          }}
          fsBar={
            <>
              <span className="fst">{pageLabel(page)}</span>
              {markBtn}
            </>
          }
        >
          {onSheet.map((w) => (
            <WeldMark
              key={w.weld_no}
              weld={w}
              editable={editable && !w.carried}
              onOpen={(x) => setSheet({ weldNo: x.weld_no, at: null })}
              onMove={move}
            />
          ))}
        </MapViewer>
        <div className="side">
          <div className="panel">
            <h3>
              Welds on this sheet ({current.length})
              {current.length !== p.welds.filter((w) => !w.carried).length ? <span className="small muted"> of {p.welds.filter((w) => !w.carried).length}</span> : null}
            </h3>
            {editable && current.length ? <div className="small muted mb8">Drag a bubble to move it off the linework. Drag the arrow to fix the weld location.</div> : null}
            <div className="hlist">
              {current.length ? (
                current.map((w) => <WeldRow key={w.weld_no} w={w} onOpen={(x) => setSheet({ weldNo: x.weld_no, at: null })} />)
              ) : (
                <div className="small muted">{editable ? "Tap Mark a weld, then tap the joint on the drawing." : "No welds recorded yet."}</div>
              )}
            </div>
          </div>
          {carried.length ? (
            <div className="panel">
              <h3>Carried from an earlier department</h3>
              <div className="hlist">
                {carried.map((w) => (
                  <WeldRow key={w.weld_no} w={w} onOpen={(x) => setSheet({ weldNo: x.weld_no, at: null })} />
                ))}
              </div>
            </div>
          ) : null}
          <WeldRecord p={p} mutate={mutate} />
        </div>
      </div>
      {sheet && (sheet.weldNo === null || open) ? (
        <WeldSheet
          key={sheet.weldNo ?? "new"}
          p={p}
          weld={open}
          at={sheet.at}
          editable={canEdit && !(open ? !!p.pages.find((x) => x.n === open.page)?.void : isVoid) && !open?.carried}
          myStamp={myStamp}
          sub={sub}
          onSave={(body) => void (open ? save(open, body) : add(body))}
          onRemove={() => {
            if (open) void remove(open);
          }}
          onClose={() => setSheet(null)}
        />
      ) : null}
    </div>
  );
}