import { permissions } from "@mrp/shared";
import type { PurchaseOrderDetailDto, PurchaseOrderStatus } from "@mrp/shared";
import type { WarehouseLocationOptionDto } from "@mrp/shared/dist/inventory/types.js";
import type { PurchaseReceiptInput } from "@mrp/shared/dist/purchasing/types.js";
import type { DemandPlanningRollupDto } from "@mrp/shared/dist/sales/types.js";
import { useEffect, useState } from "react";
import { Link, useParams } from "react-router-dom";

import { useAuth } from "../../auth/AuthProvider";
import { ConfirmActionDialog } from "../../components/ConfirmActionDialog";
import { DocumentRevisionComparison } from "../../components/DocumentRevisionComparison";
import { FileAttachmentsPanel } from "../../components/FileAttachmentsPanel";
import { api, ApiError } from "../../lib/api";
import { emptyPurchaseReceiptInput, purchaseStatusOptions } from "./config";
import { PurchaseStatusBadge } from "./PurchaseStatusBadge";

function formatCurrency(value: number) {
  return `$${value.toFixed(2)}`;
}

function mapPurchaseDocumentForComparison(
  document: Pick<
    PurchaseOrderDetailDto,
    | "documentNumber"
    | "vendorName"
    | "status"
    | "issueDate"
    | "taxPercent"
    | "taxAmount"
    | "freightAmount"
    | "subtotal"
    | "total"
    | "notes"
    | "paymentTerms"
    | "currencyCode"
    | "lines"
    | "receipts"
  >
) {
  return {
    title: document.documentNumber,
    subtitle: document.vendorName,
    status: document.status,
    metaFields: [
      { label: "Issue Date", value: new Date(document.issueDate).toLocaleDateString() },
      { label: "Payment Terms", value: document.paymentTerms || "N/A" },
      { label: "Currency", value: document.currencyCode || "USD" },
      { label: "Receipts", value: document.receipts.length.toString() },
    ],
    totalFields: [
      { label: "Subtotal", value: formatCurrency(document.subtotal) },
      { label: "Tax", value: `${formatCurrency(document.taxAmount)} (${document.taxPercent.toFixed(2)}%)` },
      { label: "Freight", value: formatCurrency(document.freightAmount) },
      { label: "Total", value: formatCurrency(document.total) },
    ],
    notes: document.notes,
    lines: document.lines.map((line) => ({
      key: line.id || `${line.itemId}-${line.position}`,
      title: `${line.itemSku} | ${line.itemName}`,
      subtitle: line.description,
      quantity: `${line.quantity} ${line.unitOfMeasure}`,
      unitLabel: line.unitOfMeasure,
      amountLabel: formatCurrency(line.unitCost),
      totalLabel: formatCurrency(line.lineTotal),
      extraLabel:
        `${line.receivedQuantity} received | ${line.remainingQuantity} remaining` +
        (line.salesOrderNumber ? ` | Demand ${line.salesOrderNumber}` : ""),
    })),
  };
}

export function PurchaseDetailPage() {
  const { token, user } = useAuth();
  const { orderId } = useParams();
  const [document, setDocument] = useState<PurchaseOrderDetailDto | null>(null);
  const [locationOptions, setLocationOptions] = useState<WarehouseLocationOptionDto[]>([]);
  const [receiptForm, setReceiptForm] = useState<PurchaseReceiptInput>(emptyPurchaseReceiptInput);
  const [receiptQuantities, setReceiptQuantities] = useState<Record<string, number>>({});
  const [receiptStatus, setReceiptStatus] = useState("Receive ordered material into inventory against this purchase order.");
  const [isSavingReceipt, setIsSavingReceipt] = useState(false);
  const [status, setStatus] = useState("Loading purchase order...");
  const [isUpdatingStatus, setIsUpdatingStatus] = useState(false);
  const [isOpeningPdf, setIsOpeningPdf] = useState(false);
  const [planningRollup, setPlanningRollup] = useState<DemandPlanningRollupDto | null>(null);
  const [pendingConfirmation, setPendingConfirmation] = useState<
    | {
        kind: "status" | "receipt";
        title: string;
        description: string;
        impact: string;
        recovery: string;
        confirmLabel: string;
        confirmationLabel?: string;
        confirmationValue?: string;
        nextStatus?: PurchaseOrderStatus;
      }
    | null
  >(null);

  const canManage = user?.permissions.includes("purchasing.write") ?? false;
  const canReceive = canManage && (user?.permissions.includes(permissions.inventoryWrite) ?? false);

  useEffect(() => {
    if (!token || !orderId) {
      return;
    }

    api.getPurchaseOrder(token, orderId)
      .then((nextDocument) => {
        setDocument(nextDocument);
        setStatus("Purchase order loaded.");
      })
      .catch((error: unknown) => {
        const message = error instanceof ApiError ? error.message : "Unable to load purchase order.";
        setStatus(message);
      });
    api.getDemandPlanningRollup(token).then(setPlanningRollup).catch(() => setPlanningRollup(null));

    if (!canReceive) {
      return;
    }

    api.getWarehouseLocationOptions(token)
      .then((options) => {
        setLocationOptions(options);
        setReceiptForm((current: PurchaseReceiptInput) => {
          if (current.locationId) {
            return current;
          }

          const firstOption = options[0];
          return firstOption
            ? {
                ...current,
                warehouseId: firstOption.warehouseId,
                locationId: firstOption.locationId,
              }
            : current;
        });
      })
      .catch(() => setLocationOptions([]));
  }, [canReceive, orderId, token]);

  useEffect(() => {
    if (!document) {
      return;
    }

    setReceiptQuantities((current) => {
      const next: Record<string, number> = {};
      for (const line of document.lines) {
        if (line.remainingQuantity > 0) {
          next[line.id] = current[line.id] ?? 0;
        }
      }

      return next;
    });
  }, [document]);

  if (!document) {
    return <div className="rounded-[20px] border border-line/70 bg-surface/90 p-4 text-sm text-muted shadow-panel">{status}</div>;
  }

  const activeDocument = document;
  const openLines = activeDocument.lines.filter((line) => line.remainingQuantity > 0);
  const demandContextItems =
    planningRollup?.items.filter((item) => activeDocument.lines.some((line) => line.itemId === item.itemId) && (item.recommendedPurchaseQuantity > 0 || item.uncoveredQuantity > 0)) ?? [];

  function updateReceiptField<Key extends keyof PurchaseReceiptInput>(key: Key, value: PurchaseReceiptInput[Key]) {
    setReceiptForm((current: PurchaseReceiptInput) => ({ ...current, [key]: value }));
  }

  function updateReceiptQuantity(lineId: string, quantity: number) {
    setReceiptQuantities((current: Record<string, number>) => ({
      ...current,
      [lineId]: quantity,
    }));
  }

  async function applyStatusChange(nextStatus: PurchaseOrderStatus) {
    if (!token) {
      return;
    }

    setIsUpdatingStatus(true);
    setStatus("Updating purchase order status...");

    try {
      const nextDocument = await api.updatePurchaseOrderStatus(token, activeDocument.id, nextStatus);
      setDocument(nextDocument);
      setStatus("Purchase order status updated. Confirm vendor communication and receiving expectations if this moved the order into a terminal state.");
    } catch (error: unknown) {
      const message = error instanceof ApiError ? error.message : "Unable to update purchase order status.";
      setStatus(message);
    } finally {
      setIsUpdatingStatus(false);
    }
  }

  async function applyReceipt() {
    if (!token || !canReceive) {
      return;
    }

    setIsSavingReceipt(true);
    setReceiptStatus("Posting purchase receipt...");

    try {
      const payload: PurchaseReceiptInput = {
        ...receiptForm,
        lines: openLines
          .map((line) => ({
            purchaseOrderLineId: line.id,
            quantity: Math.max(0, Math.floor(receiptQuantities[line.id] ?? 0)),
          }))
          .filter((line) => line.quantity > 0),
      };

      const nextDocument = await api.createPurchaseReceipt(token, activeDocument.id, payload);
      setDocument(nextDocument);
      setReceiptQuantities({});
      setReceiptForm((current: PurchaseReceiptInput) => ({
        ...current,
        receivedAt: new Date().toISOString(),
        notes: "",
      }));
      setReceiptStatus("Purchase receipt recorded. Inventory has been increased; verify stock balances and post a correcting movement if quantities were overstated.");
      setStatus("Purchase order updated after receipt.");
    } catch (error: unknown) {
      const message = error instanceof ApiError ? error.message : "Unable to record purchase receipt.";
      setReceiptStatus(message);
    } finally {
      setIsSavingReceipt(false);
    }
  }

  function handleStatusChange(nextStatus: PurchaseOrderStatus) {
    const label = purchaseStatusOptions.find((option) => option.value === nextStatus)?.label ?? nextStatus;
    setPendingConfirmation({
      kind: "status",
      title: `Set purchase order to ${label}`,
      description: `Update ${activeDocument.documentNumber} from ${activeDocument.status} to ${nextStatus}.`,
      impact:
        nextStatus === "CLOSED"
          ? "This closes the order operationally and can change inbound supply expectations, shortage coverage, and vendor follow-up."
          : "This changes the purchasing state used by receiving, planning, and audit review.",
      recovery: "If the status is wrong, set the order back to the correct state and verify any downstream receiving or planning assumptions.",
      confirmLabel: `Set ${label}`,
      confirmationLabel: nextStatus === "CLOSED" ? "Type purchase order number to confirm:" : undefined,
      confirmationValue: nextStatus === "CLOSED" ? activeDocument.documentNumber : undefined,
      nextStatus,
    });
  }

  function handleReceiptSubmit(event: React.FormEvent<HTMLFormElement>) {
    event.preventDefault();
    const totalReceiptQuantity = openLines.reduce((sum, line) => sum + Math.max(0, Math.floor(receiptQuantities[line.id] ?? 0)), 0);
    setPendingConfirmation({
      kind: "receipt",
      title: "Post purchase receipt",
      description: `Receive ${totalReceiptQuantity} total units into ${receiptForm.warehouseId && receiptForm.locationId ? "the selected stock location" : "inventory"} for ${activeDocument.documentNumber}.`,
      impact: "This increases inventory immediately and becomes part of the PO receipt history.",
      recovery: "If quantities are wrong, post the correcting inventory movement and review the remaining quantities on the purchase order.",
      confirmLabel: "Post receipt",
      confirmationLabel: totalReceiptQuantity > 0 ? "Type purchase order number to confirm:" : undefined,
      confirmationValue: totalReceiptQuantity > 0 ? activeDocument.documentNumber : undefined,
    });
  }

  async function handleOpenPdf() {
    if (!token) {
      return;
    }

    setIsOpeningPdf(true);
    setStatus("Rendering purchase order PDF...");

    try {
      const blob = await api.getPurchaseOrderPdf(token, activeDocument.id);
      const objectUrl = URL.createObjectURL(blob);
      window.open(objectUrl, "_blank", "noopener,noreferrer");
      window.setTimeout(() => URL.revokeObjectURL(objectUrl), 60_000);
      setStatus("Purchase order PDF ready.");
    } catch (error: unknown) {
      const message = error instanceof ApiError ? error.message : "Unable to render purchase order PDF.";
      setStatus(message);
    } finally {
      setIsOpeningPdf(false);
    }
  }

  return (
    <section className="space-y-4">
      <div className="rounded-[20px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
        <div className="flex flex-col gap-3 lg:flex-row lg:items-start lg:justify-between">
          <div>
            <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Purchase Order</p>
            <h3 className="mt-2 text-xl font-bold text-text">{activeDocument.documentNumber}</h3>
            <p className="mt-1 text-sm text-text">{activeDocument.vendorName}</p>
            <div className="mt-3 flex flex-wrap gap-2">
              <PurchaseStatusBadge status={activeDocument.status} />
              <span className="inline-flex items-center rounded-full border border-line/70 px-2 py-1 text-xs font-semibold uppercase tracking-[0.16em] text-muted">
                Rev {activeDocument.revisions[0]?.revisionNumber ?? 0}
              </span>
            </div>
          </div>
          <div className="flex flex-wrap gap-3">
            <Link to="/purchasing/orders" className="inline-flex items-center justify-center rounded-2xl border border-line/70 px-2 py-2 text-sm font-semibold text-text">
              Back to purchase orders
            </Link>
            <button
              type="button"
              onClick={handleOpenPdf}
              disabled={isOpeningPdf}
              className="inline-flex items-center justify-center rounded-2xl border border-line/70 px-2 py-2 text-sm font-semibold text-text disabled:cursor-not-allowed disabled:opacity-60"
            >
              {isOpeningPdf ? "Rendering PDF..." : "Open PDF"}
            </button>
            {canManage ? (
              <Link to={`/purchasing/orders/${activeDocument.id}/edit`} className="inline-flex items-center justify-center rounded-2xl bg-brand px-2 py-2 text-sm font-semibold text-white">
                Edit purchase order
              </Link>
            ) : null}
          </div>
        </div>
      </div>
      {canManage ? (
        <section className="rounded-[20px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
          <div className="flex flex-col gap-3 lg:flex-row lg:items-center lg:justify-between">
            <div>
              <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Quick Actions</p>
              <p className="mt-2 text-sm text-muted">Update purchase-order status without opening the full editor.</p>
            </div>
            <div className="flex flex-wrap gap-2">
              {purchaseStatusOptions.map((option) => (
                <button key={option.value} type="button" onClick={() => handleStatusChange(option.value)} disabled={isUpdatingStatus || activeDocument.status === option.value} className="rounded-2xl border border-line/70 px-2 py-2 text-sm font-semibold text-text disabled:cursor-not-allowed disabled:opacity-60">
                  {option.label}
                </button>
              ))}
            </div>
          </div>
        </section>
      ) : null}
      <section className="grid gap-3 xl:grid-cols-4">
        <article className="rounded-[18px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel"><p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Issue Date</p><div className="mt-2 text-base font-bold text-text">{new Date(activeDocument.issueDate).toLocaleDateString()}</div></article>
        <article className="rounded-[18px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel"><p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Lines</p><div className="mt-2 text-base font-bold text-text">{activeDocument.lineCount}</div></article>
        <article className="rounded-[18px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel"><p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Receipts</p><div className="mt-2 text-base font-bold text-text">{activeDocument.receipts.length}</div></article>
        <article className="rounded-[18px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel"><p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Qty Remaining</p><div className="mt-2 text-base font-bold text-text">{activeDocument.lines.reduce((sum, line) => sum + line.remainingQuantity, 0)}</div></article>
      </section>
      <section className="grid gap-3 xl:grid-cols-4">
        <article className="rounded-[18px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel"><p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Subtotal</p><div className="mt-2 text-base font-bold text-text">${activeDocument.subtotal.toFixed(2)}</div></article>
        <article className="rounded-[18px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel"><p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Total</p><div className="mt-2 text-base font-bold text-text">${activeDocument.total.toFixed(2)}</div></article>
        <article className="rounded-[18px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel"><p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Tax</p><div className="mt-2 text-base font-bold text-text">${activeDocument.taxAmount.toFixed(2)}</div><div className="mt-1 text-xs text-muted">{activeDocument.taxPercent.toFixed(2)}%</div></article>
        <article className="rounded-[18px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel"><p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Freight</p><div className="mt-2 text-base font-bold text-text">${activeDocument.freightAmount.toFixed(2)}</div></article>
        <article className="rounded-[18px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel"><p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Payment Terms</p><div className="mt-2 text-base font-bold text-text">{activeDocument.paymentTerms || "N/A"}</div></article>
        <article className="rounded-[18px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel"><p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Currency</p><div className="mt-2 text-base font-bold text-text">{activeDocument.currencyCode || "USD"}</div></article>
      </section>
      <section className="rounded-[20px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
        <div className="flex items-center justify-between gap-3">
          <div>
            <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Revision History</p>
            <p className="mt-2 text-sm text-muted">Automatic snapshots are recorded when the purchase order changes or receipts are posted.</p>
          </div>
        </div>
        {activeDocument.revisions.length === 0 ? (
          <div className="mt-6 rounded-[18px] border border-dashed border-line/70 bg-page/60 px-4 py-8 text-center text-sm text-muted">
            No revisions have been recorded yet.
          </div>
        ) : (
          <div className="mt-6 space-y-3">
            {activeDocument.revisions.map((revision) => (
              <article key={revision.id} className="rounded-[18px] border border-line/70 bg-page/60 p-3">
                <div className="flex flex-wrap items-start justify-between gap-3">
                  <div>
                    <div className="font-semibold text-text">Rev {revision.revisionNumber}</div>
                    <div className="mt-1 text-sm text-text">{revision.reason}</div>
                  </div>
                  <div className="text-right text-xs text-muted">
                    <div>{new Date(revision.createdAt).toLocaleString()}</div>
                    <div className="mt-1">{revision.createdByName ?? "System"}</div>
                  </div>
                </div>
              </article>
            ))}
          </div>
        )}
      </section>
      {activeDocument.revisions.length > 0 ? (
        <DocumentRevisionComparison
          title="Revision Comparison"
          description="Compare earlier purchase-order revisions against the current document or another revision to review commercial, receiving, and line-level changes."
          currentLabel="Current document"
          currentDocument={mapPurchaseDocumentForComparison(activeDocument)}
          revisions={activeDocument.revisions.map((revision) => ({
            id: revision.id,
            label: `Rev ${revision.revisionNumber}`,
            meta: `${new Date(revision.createdAt).toLocaleString()} | ${revision.createdByName ?? "System"}`,
          }))}
          getRevisionDocument={(revisionId) => {
            if (revisionId === "current") {
              return mapPurchaseDocumentForComparison(activeDocument);
            }

            const revision = activeDocument.revisions.find((entry) => entry.id === revisionId);
            if (!revision) {
              return mapPurchaseDocumentForComparison(activeDocument);
            }

            return mapPurchaseDocumentForComparison({
              ...revision.snapshot,
              lines: revision.snapshot.lines.map((line) => ({
                id: `${line.itemId}-${line.position}`,
                ...line,
              })),
              receipts: revision.snapshot.receipts,
            });
          }}
        />
      ) : null}
      <div className="grid gap-3 xl:grid-cols-[minmax(0,1.05fr)_minmax(320px,0.95fr)]">
        <article className="rounded-[20px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
          <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Vendor</p>
          <dl className="mt-5 grid gap-3">
            <div><dt className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Account</dt><dd className="mt-1 text-sm text-text"><Link to={`/crm/vendors/${activeDocument.vendorId}`} className="hover:text-brand">{activeDocument.vendorName}</Link></dd></div>
            <div><dt className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Email</dt><dd className="mt-1 text-sm text-text">{activeDocument.vendorEmail}</dd></div>
          </dl>
        </article>
        <article className="rounded-[20px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
          <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Notes</p>
          <p className="mt-3 whitespace-pre-line text-sm leading-6 text-text">{activeDocument.notes || "No notes recorded for this document."}</p>
        </article>
      </div>
      <section className="rounded-[20px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
        <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Demand Context</p>
        {demandContextItems.length === 0 ? (
          <div className="mt-6 rounded-[18px] border border-dashed border-line/70 bg-page/60 px-4 py-8 text-center text-sm text-muted">
            No active shared shortage or buy-signal records currently point at items on this purchase order.
          </div>
        ) : (
          <div className="mt-5 space-y-3">
            {demandContextItems.map((item) => (
              <div key={item.itemId} className="rounded-[18px] border border-line/70 bg-page/60 p-3">
                <div className="flex flex-wrap items-center justify-between gap-3">
                  <div>
                    <div className="font-semibold text-text">{item.itemSku}</div>
                    <div className="mt-1 text-xs text-muted">{item.itemName}</div>
                  </div>
                  <div className="text-sm text-muted">
                    Buy {item.recommendedPurchaseQuantity} · Uncovered {item.uncoveredQuantity}
                  </div>
                </div>
              </div>
            ))}
          </div>
        )}
      </section>
      <section className="rounded-[20px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
        <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Line Items</p>
        {activeDocument.lines.length === 0 ? (
          <div className="mt-6 rounded-[18px] border border-dashed border-line/70 bg-page/60 px-4 py-8 text-center text-sm text-muted">No line items have been added yet.</div>
        ) : (
          <div className="mt-6 overflow-hidden rounded-2xl border border-line/70">
            <table className="min-w-full divide-y divide-line/70 text-sm">
              <thead className="bg-page/80 text-left text-muted">
                <tr><th className="px-2 py-2">Item</th><th className="px-2 py-2">Description</th><th className="px-2 py-2">Demand Source</th><th className="px-2 py-2">Ordered</th><th className="px-2 py-2">Received</th><th className="px-2 py-2">Remaining</th><th className="px-2 py-2">UOM</th><th className="px-2 py-2">Unit Cost</th><th className="px-2 py-2">Total</th></tr>
              </thead>
              <tbody className="divide-y divide-line/70 bg-surface">
                {activeDocument.lines.map((line: PurchaseOrderDetailDto["lines"][number]) => (
                  <tr key={line.id}>
                    <td className="px-2 py-2"><div className="font-semibold text-text">{line.itemSku}</div><div className="mt-1 text-xs text-muted">{line.itemName}</div></td>
                    <td className="px-2 py-2 text-muted">{line.description}</td>
                    <td className="px-2 py-2 text-muted">
                      {line.salesOrderId && line.salesOrderNumber ? <Link to={`/sales/orders/${line.salesOrderId}`} className="hover:text-brand">{line.salesOrderNumber}</Link> : "Unlinked"}
                    </td>
                    <td className="px-2 py-2 text-muted">{line.quantity}</td>
                    <td className="px-2 py-2 text-muted">{line.receivedQuantity}</td>
                    <td className="px-2 py-2 text-muted">{line.remainingQuantity}</td>
                    <td className="px-2 py-2 text-muted">{line.unitOfMeasure}</td>
                    <td className="px-2 py-2 text-muted">${line.unitCost.toFixed(2)}</td>
                    <td className="px-2 py-2 text-muted">${line.lineTotal.toFixed(2)}</td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        )}
      </section>
      <section className="grid gap-3 2xl:grid-cols-[minmax(360px,0.82fr)_minmax(0,1.18fr)]">
        {canReceive ? (
          <article className="rounded-[20px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
            <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Purchase Receiving</p>
            <h4 className="mt-2 text-lg font-bold text-text">Receive material</h4>
            <p className="mt-2 text-sm text-muted">Post received quantities to inventory and retain a receipt record against this order.</p>
            {openLines.length === 0 ? (
              <div className="mt-5 rounded-[18px] border border-dashed border-line/70 bg-page/60 px-4 py-8 text-center text-sm text-muted">
                All ordered quantities have been received for this purchase order.
              </div>
            ) : (
              <form className="mt-5 space-y-4" onSubmit={handleReceiptSubmit}>
                <div className="grid gap-3 xl:grid-cols-2">
                  <label className="block">
                    <span className="mb-2 block text-sm font-semibold text-text">Receipt date</span>
                    <input
                      type="date"
                      value={receiptForm.receivedAt.slice(0, 10)}
                      onChange={(event) => updateReceiptField("receivedAt", new Date(event.target.value).toISOString())}
                      className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand"
                    />
                  </label>
                  <label className="block">
                    <span className="mb-2 block text-sm font-semibold text-text">Stock location</span>
                    <select
                      value={receiptForm.locationId}
                      onChange={(event) => {
                        const nextLocation = locationOptions.find((option) => option.locationId === event.target.value);
                        updateReceiptField("locationId", event.target.value);
                        if (nextLocation) {
                          updateReceiptField("warehouseId", nextLocation.warehouseId);
                        }
                      }}
                      className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand"
                    >
                      {locationOptions.map((option) => (
                        <option key={option.locationId} value={option.locationId}>
                          {option.warehouseCode} / {option.locationCode}
                        </option>
                      ))}
                    </select>
                  </label>
                </div>
                <label className="block">
                  <span className="mb-2 block text-sm font-semibold text-text">Notes</span>
                  <textarea
                    value={receiptForm.notes}
                    onChange={(event) => updateReceiptField("notes", event.target.value)}
                    rows={3}
                    className="w-full rounded-[18px] border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand"
                  />
                </label>
                <div className="space-y-3">
                  {openLines.map((line) => (
                    <div key={line.id} className="grid gap-3 rounded-[18px] border border-line/70 bg-page/60 p-3 xl:grid-cols-[minmax(0,1.3fr)_0.6fr_0.7fr_0.7fr]">
                      <div>
                        <div className="font-semibold text-text">{line.itemSku}</div>
                        <div className="mt-1 text-xs text-muted">{line.itemName}</div>
                        <div className="mt-2 text-xs text-muted">{line.description}</div>
                      </div>
                      <div className="text-sm">
                        <div className="text-xs font-semibold uppercase tracking-[0.16em] text-muted">Remaining</div>
                        <div className="mt-2 font-semibold text-text">{line.remainingQuantity}</div>
                      </div>
                      <div className="text-sm">
                        <div className="text-xs font-semibold uppercase tracking-[0.16em] text-muted">Received</div>
                        <div className="mt-2 font-semibold text-text">{line.receivedQuantity}</div>
                      </div>
                      <label className="block">
                        <span className="mb-2 block text-xs font-semibold uppercase tracking-[0.16em] text-muted">Receive Now</span>
                        <input
                          type="number"
                          min={0}
                          max={line.remainingQuantity}
                          step={1}
                          value={receiptQuantities[line.id] ?? 0}
                          onChange={(event) => updateReceiptQuantity(line.id, Number.parseInt(event.target.value, 10) || 0)}
                          className="w-full rounded-2xl border border-line/70 bg-surface px-2 py-2 text-text outline-none transition focus:border-brand"
                        />
                      </label>
                    </div>
                  ))}
                </div>
                <div className="flex flex-col gap-3 rounded-2xl border border-line/70 bg-page/70 px-2 py-2 sm:flex-row sm:items-center sm:justify-between">
                  <span className="min-w-0 text-sm text-muted">{receiptStatus}</span>
                  <button
                    type="submit"
                    disabled={isSavingReceipt || locationOptions.length === 0}
                    className="rounded-2xl bg-brand px-2 py-2 text-sm font-semibold text-white disabled:cursor-not-allowed disabled:opacity-60"
                  >
                    {isSavingReceipt ? "Posting..." : "Post receipt"}
                  </button>
                </div>
              </form>
            )}
          </article>
        ) : null}
        <article className="rounded-[20px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
          <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Receipt History</p>
          <h4 className="mt-2 text-lg font-bold text-text">Received material log</h4>
          {activeDocument.receipts.length === 0 ? (
            <div className="mt-6 rounded-[18px] border border-dashed border-line/70 bg-page/60 px-4 py-8 text-center text-sm text-muted">
              No purchase receipts have been recorded for this order yet.
            </div>
          ) : (
            <div className="mt-6 space-y-3">
              {activeDocument.receipts.map((receipt) => (
                <article key={receipt.id} className="rounded-[18px] border border-line/70 bg-page/60 p-3">
                  <div className="flex flex-col gap-3 lg:flex-row lg:items-start lg:justify-between">
                    <div>
                      <div className="text-sm font-semibold text-text">{receipt.receiptNumber}</div>
                      <div className="mt-1 text-xs text-muted">
                        {receipt.warehouseCode} / {receipt.locationCode} · {receipt.totalQuantity} units across {receipt.lineCount} line{receipt.lineCount === 1 ? "" : "s"}
                      </div>
                      <div className="mt-2 text-xs text-muted">
                        {receipt.warehouseName} · {receipt.locationName}
                      </div>
                      <div className="mt-3 space-y-1">
                        {receipt.lines.map((line) => (
                          <div key={line.id} className="text-sm text-text">
                            <span className="font-semibold">{line.itemSku}</span> · {line.quantity}
                          </div>
                        ))}
                      </div>
                      {receipt.notes ? <p className="mt-3 whitespace-pre-line text-sm leading-6 text-text">{receipt.notes}</p> : null}
                    </div>
                    <div className="text-sm text-muted lg:text-right">
                      <div>{new Date(receipt.receivedAt).toLocaleDateString()}</div>
                      <div className="mt-1">{receipt.createdByName}</div>
                    </div>
                  </div>
                </article>
              ))}
            </div>
          )}
        </article>
      </section>
      <FileAttachmentsPanel
        ownerType="PURCHASE_ORDER"
        ownerId={activeDocument.id}
        eyebrow="Supporting Documents"
        title="Vendor invoices and backup"
        description="Store vendor invoices, acknowledgements, certifications, and supporting procurement documents directly on the purchase order."
        emptyMessage="No vendor supporting documents have been uploaded for this purchase order yet."
      />
      <div className="rounded-2xl border border-line/70 bg-page/60 px-2 py-2 text-sm text-muted">{status}</div>
      <ConfirmActionDialog
        open={pendingConfirmation != null}
        title={pendingConfirmation?.title ?? "Confirm purchasing action"}
        description={pendingConfirmation?.description ?? ""}
        impact={pendingConfirmation?.impact}
        recovery={pendingConfirmation?.recovery}
        confirmLabel={pendingConfirmation?.confirmLabel ?? "Confirm"}
        confirmationLabel={pendingConfirmation?.confirmationLabel}
        confirmationValue={pendingConfirmation?.confirmationValue}
        isConfirming={
          (pendingConfirmation?.kind === "status" && isUpdatingStatus) ||
          (pendingConfirmation?.kind === "receipt" && isSavingReceipt)
        }
        onClose={() => {
          if (!isUpdatingStatus && !isSavingReceipt) {
            setPendingConfirmation(null);
          }
        }}
        onConfirm={async () => {
          if (!pendingConfirmation) {
            return;
          }

          if (pendingConfirmation.kind === "status" && pendingConfirmation.nextStatus) {
            await applyStatusChange(pendingConfirmation.nextStatus);
            setPendingConfirmation(null);
            return;
          }

          if (pendingConfirmation.kind === "receipt") {
            await applyReceipt();
            setPendingConfirmation(null);
          }
        }}
      />
    </section>
  );
}