import { useEffect, useState } from "react";
import { Package, Scale, CreditCard, CalendarDays, Paperclip, Building2, Ban } from "lucide-react";
import type { Attachment, Quote, Store } from "../../lib/types";
import { api } from "../../lib/api";
import {
  formatMaterialTitle,
  itemTermsheetIds,
  lineItemTotal,
  materialById,
  refConverted,
} from "../../lib/quoteUtils";
import { fmtDate, fmtDateTime, fmtNum } from "../../lib/formatters";
import { groupCommas } from "../../lib/numutil";
import { FlowDiagram, type FlowRefs } from "./FlowDiagram";
import { itemProjects } from "../../lib/quoteUtils";

export interface QuoteDetailProps {
  store: Store;
  q: Quote;
}

// بخش expanded یک پیشنهاد: اقلام (راست) ↔ ترم‌شیت‌ها (چپ) با خطوط SVG رنگی
export function QuoteDetail({ store, q }: QuoteDetailProps) {
  const [flowEl, setFlowEl] = useState<HTMLDivElement | null>(null);
  const [flowRefs] = useState<FlowRefs>(() => ({ items: new Map(), termsheets: new Map() }));
  const [bump, setBump] = useState(0);

  useEffect(() => {
    // بعد از نشستن layout (فونت/تصویر) خطوط دوباره رسم شوند
    const t = setTimeout(() => setBump((b) => b + 1), 350);
    return () => clearTimeout(t);
  }, []);
  void bump;

  // پیوست‌ها (فاکتور/پیش‌فاکتور) مستقیماً از سرور (MinIO) خوانده می‌شوند
  const [attachments, setAttachments] = useState<{ invoices: Attachment[]; proformas: Attachment[] }>({
    invoices: [],
    proformas: [],
  });
  useEffect(() => {
    let alive = true;
    void Promise.all([
      api.files.list(q.id, "invoice").catch(() => [] as Attachment[]),
      api.files.list(q.id, "proforma").catch(() => [] as Attachment[]),
    ]).then(([invoices, proformas]) => {
      if (alive) setAttachments({ invoices, proformas });
    });
    return () => {
      alive = false;
    };
  }, [q.id]);

  const tsList = q.termsheets || [];
  const allItems = q.line_items || [];
  const items = allItems.filter((li) => !li.rejected);
  const rejectedItems = allItems.filter((li) => li.rejected);

  // وقتی داده‌ی جریان عوض شد (پذیرش/رسید/ویرایش) خطوط دوباره رسم شوند
  const redrawKey = JSON.stringify({
    items: allItems.map((li) => [li.id, li.accepted_ts_id, !!li.rejected, !!li.arrived_date]),
    ts: tsList.map((t) => [t.id, t.status]),
  });

  const itemBox = (li: (typeof allItems)[number], isRejected: boolean) => {
    const m = materialById(store.materials, li.material_id);
    const tsIds = itemTermsheetIds(li).filter((tid) => tsList.some((t) => t.id === tid));
    const total = lineItemTotal(li);
    const projs = itemProjects(q, li);
    const conv = isRejected ? null : refConverted(store, li);

    // رسید جزیی → قلم به دو بخش «رسید شده» و «در راه» شکسته می‌شود (نمایشی):
    // مجموع دو بخش همیشه با تعداد/مبلغ اصلی برابر است (عدم تغییر جمع کل پیشنهاد).
    const qty = li.quantity ?? 0;
    const recv = !isRejected ? li.received_qty || 0 : 0;
    const remaining = Math.max(0, qty - recv);
    const whNames = (li.received_warehouses || []).map((w) => w.name);
    const showSplit = !isRejected && q.status !== "offered" && qty > 0;
    const fullyReceived = showSplit && recv >= qty;
    return (
      <div
        key={li.id}
        ref={(el) => {
          if (el) {
            flowRefs.items.set(li.id, el);
            el.dataset.tsIds = tsIds.join(",");
            el.dataset.acceptedTs = li.accepted_ts_id || "";
          } else {
            flowRefs.items.delete(li.id);
          }
        }}
        className={`flow-box flow-item${isRejected ? " rejected" : ""}${li.arrived_date ? " deal" : ""}${
          fullyReceived ? " fb-fully-received" : ""
        }`}
      >
        <div className="fb-name">
          <Package className="me-1 inline h-3 w-3 text-muted" />
          {formatMaterialTitle(m)}
        </div>
        <div className="fb-meta">
          <Building2 className="me-1 inline h-3 w-3" /> {projs.length ? projs.join("، ") : "—"}
        </div>
        {showSplit ? (
          <div className="fb-nums">
            {recv > 0 && (
              <span className="pill-recvd">
                رسید شده ✓ {fmtNum(recv)} {li.unit || ""}
              </span>
            )}
            {remaining > 0 && (
              <span className="pill-pend">
                در راه ⏳ {fmtNum(remaining)} {li.unit || ""}
              </span>
            )}
            <span>× {groupCommas(li.unit_price, true)}</span>
            <span className="fb-total">= {total != null ? groupCommas(total, true) + " تومان" : "—"}</span>
          </div>
        ) : (
          <div className="fb-nums">
            <span>
              {fmtNum(li.quantity)} {li.unit || ""}
            </span>
            <span>× {groupCommas(li.unit_price, true)}</span>
            <span className="fb-total">= {total != null ? groupCommas(total, true) + " تومان" : "—"}</span>
          </div>
        )}
        {showSplit && recv > 0 && (
          <div className="fb-receipt-meta">
            <span className="pill-recvd-mini">✓ {fmtNum(recv)} {li.unit || ""}</span>
            {li.arrived_date && <span>تاریخ رسید: {fmtDateTime(li.arrived_date)}</span>}
            {whNames.length > 0 && <span>به انبار: {whNames.join("، ")}</span>}
          </div>
        )}
        {conv && (
          <div className="fb-conv">
            <Scale className="me-1 inline h-3 w-3" /> ≈ {groupCommas(conv.qty, true)} {conv.unit}
            {conv.perRef != null ? ` · ${groupCommas(conv.perRef, true)} تومان/${conv.unit}` : ""}
          </div>
        )}
      </div>
    );
  };

  const attachParts: React.ReactNode[] = [];
  attachments.proformas.forEach((pf, i) => {
    if (!pf.id) return;
    attachParts.push(
      <a key={"pf" + i} className="detail-link" href={api.files.downloadUrl(q.id, "proforma", pf.id)} download={pf.name}>
        <Paperclip className="me-1 inline h-3 w-3" />
        پیش‌فاکتور: {pf.name}
      </a>,
    );
  });
  attachments.invoices.forEach((inv, i) => {
    if (!inv.id) return;
    attachParts.push(
      <a key={"inv" + i} className="detail-link" href={api.files.downloadUrl(q.id, "invoice", inv.id)} download={inv.name}>
        <Paperclip className="me-1 inline h-3 w-3" />
        فاکتور اصلی: {inv.name}
      </a>,
    );
  });

  return (
    <div ref={setFlowEl} className="flow border-t border-line" data-status={q.status}>
      <div className="flow-cols">
        <div className="flow-col flow-items-col">
          <div className="flow-col-h">
            <Package className="h-3.5 w-3.5" /> اقلام ({fmtNum(items.length)})
          </div>
          {items.length ? items.map((li) => itemBox(li, false)) : <div className="flow-note">—</div>}
          {rejectedItems.length > 0 && (
            <>
              <div className="flow-rejected-h">
                <Ban className="h-3 w-3" /> قلم‌های رد شده (از معامله خارج‌اند)
              </div>
              {rejectedItems.map((li) => itemBox(li, true))}
              <div className="flow-rejected-hint">
                با بازگشت وضعیت به مرحله‌ی پیشین (یا ویرایش)، این قلم‌ها برمی‌گردند.
              </div>
            </>
          )}
        </div>
        <div className="flow-col flow-terms-col">
          <div className="flow-col-h">
            <CreditCard className="h-3.5 w-3.5" /> شرایط پرداخت ({fmtNum(tsList.length)})
          </div>
          {tsList.length ? (
            tsList.map((t) => {
              const isAccepted = t.status === "accepted";
              const arrived = q.status === "arrived" && isAccepted;
              const badge = arrived ? (
                <span className="fb-badge arrived">رسیده</span>
              ) : isAccepted ? (
                <span className="fb-badge accepted">✓ پذیرفته</span>
              ) : (
                <span className="fb-badge offered">پیشنهاد</span>
              );
              return (
                <div
                  key={t.id}
                  ref={(el) => {
                    if (el) flowRefs.termsheets.set(t.id, el);
                    else flowRefs.termsheets.delete(t.id);
                  }}
                  className={`flow-box flow-ts${isAccepted ? (arrived ? " ts-arrived" : " ts-accepted") : ""}`}
                >
                  <div className="fb-name">
                    <CreditCard className="h-3.5 w-3.5 text-muted" />
                    {t.label} {badge}
                  </div>
                  <div className="fb-ms-list">
                    {(t.milestones || []).length ? (
                      t.milestones.map((m, i) => (
                        <div key={i} className="fb-ms">
                          <CalendarDays className="h-3 w-3" />
                          {m.when_iso ? fmtDate(m.when_iso) : "—"} ·{" "}
                          {m.amount != null ? groupCommas(m.amount, true) + " تومان" : "—"}
                        </div>
                      ))
                    ) : (
                      <div className="fb-ms">—</div>
                    )}
                  </div>
                </div>
              );
            })
          ) : (
            <div className="flow-note">—</div>
          )}
        </div>
      </div>
      <FlowDiagram flowEl={flowEl} refs={flowRefs} redrawKey={redrawKey} />
      {attachParts.length > 0 && (
        <div className="flow-attach">
          {attachParts.map((p, i) => (
            <span key={i} className="detail-item">
              {p}
            </span>
          ))}
        </div>
      )}
    </div>
  );
}