import { useMemo, useState } from "react";
import { useNavigate } from "react-router";
import { useQuery } from "@tanstack/react-query";
import { useVendorPortal } from "@/app/v/_components/vendor-portal-context";
import { Text } from "@/components/ui/text";
import { vendorPortalApi } from "@/domain/vendor-portal/api/vendor-portal-api";
import {
  formatVendorPortalDateTime,
  vendorPortalStatusClass,
} from "@/domain/vendor-portal/lib/status-helpers";
import {
  VENDOR_PORTAL_DISPATCH_FILTERS,
  applyVendorPortalDispatchFilter,
  getVendorPortalDispatchFilter,
  type VendorPortalDispatchFilterKey,
} from "@/domain/vendor-portal/lib/dispatch-filters";
import { queryKeys } from "@/infra/query-key/query-key";

function formatDate(value?: string) {
  if (!value) return "—";
  const date = new Date(value);
  if (Number.isNaN(date.getTime())) return "—";
  return date.toISOString().slice(0, 10);
}

function formatMoney(value?: number) {
  if (value == null) return "—";
  return `$${Number(value).toFixed(2)}`;
}

export default function VendorPortalPosPage() {
  const { token } = useVendorPortal();
  const navigate = useNavigate();
  const [filter, setFilter] = useState<VendorPortalDispatchFilterKey>("open");
  const [search, setSearch] = useState("");

  const {
    data: dispatches = [],
    isLoading,
    error,
  } = useQuery({
    queryKey: queryKeys.vendorPortal.dispatches(token),
    queryFn: () => vendorPortalApi.listDispatches(token),
    enabled: Boolean(token),
  });

  const activeFilter = getVendorPortalDispatchFilter(filter);

  const visible = useMemo(() => {
    const needle = search.trim().toLowerCase();
    return applyVendorPortalDispatchFilter(dispatches, activeFilter).filter((dispatch) => {
      if (!needle) return true;
      return (
        (dispatch.poNumber || "").toLowerCase().includes(needle) ||
        (dispatch.dispatchNumber || "").toLowerCase().includes(needle) ||
        (dispatch.internalWONumber || "").toLowerCase().includes(needle) ||
        (dispatch.workOrderTitle || "").toLowerCase().includes(needle) ||
        (dispatch.locationName || "").toLowerCase().includes(needle)
      );
    });
  }, [dispatches, activeFilter, search]);

  return (
    <>
      <div className="vp-card">
        <Text variant="title">Your Purchase Orders</Text>
        <div className="vp-muted" style={{ marginBottom: 12 }}>
          Every PO issued to your company, with current status and dollar value.
        </div>
        <div
          className="vp-actions"
          style={{ marginTop: 0, gap: 12, alignItems: "center", flexWrap: "wrap" }}
        >
          {VENDOR_PORTAL_DISPATCH_FILTERS.map((item) => (
            <button
              key={item.key}
              type="button"
              className={`vp-btn ${filter === item.key ? "vp-btn-primary" : "vp-btn-ghost"}`}
              onClick={() => setFilter(item.key)}
            >
              {item.label}{" "}
              <span style={{ opacity: 0.7, fontWeight: 400 }}>
                ({dispatches.filter(item.match).length})
              </span>
            </button>
          ))}
          <input
            className="vp-input"
            placeholder="Search PO #, WO, location…"
            value={search}
            onChange={(event) => setSearch(event.target.value)}
            style={{ marginLeft: "auto", minWidth: 240 }}
          />
        </div>
      </div>

      {isLoading && <div className="vp-card vp-muted">Loading POs…</div>}
      <Text variant="error" when={Boolean(error)} className="vp-error">
        {error?.message}
      </Text>

      {!isLoading && !error && visible.length === 0 && (
        <div className="vp-card vp-empty">No POs match this view.</div>
      )}

      {!isLoading && !error && visible.length > 0 && (
        <div className="vp-card" style={{ padding: 0 }}>
          <table className="vp-po-table">
            <thead>
              <tr>
                <th>PO #</th>
                <th>Dispatch #</th>
                <th>Status</th>
                <th>NTE</th>
                <th>Location</th>
                <th>Dispatched</th>
                <th>Scheduled</th>
                <th>Completed</th>
              </tr>
            </thead>
            <tbody>
              {visible.map((dispatch) => (
                <tr key={dispatch.id} onClick={() => navigate(`../dispatch/${dispatch.id}`)}>
                  <td>
                    <span className="vp-po-number">{dispatch.poNumber || "—"}</span>
                  </td>
                  <td className="vp-po-muted-cell">{dispatch.dispatchNumber}</td>
                  <td>
                    <span className={vendorPortalStatusClass(dispatch.status)}>
                      {dispatch.status}
                    </span>
                  </td>
                  <td>{formatMoney(dispatch.nteAmount)}</td>
                  <td className="vp-po-muted-cell">
                    {dispatch.locationName || "—"}
                    {dispatch.locationCity ? ` · ${dispatch.locationCity}` : ""}
                    {dispatch.locationState ? `, ${dispatch.locationState}` : ""}
                  </td>
                  <td className="vp-po-muted-cell">
                    {dispatch.dispatchedAt
                      ? formatVendorPortalDateTime(dispatch.dispatchedAt)
                      : "—"}
                  </td>
                  <td className="vp-po-muted-cell">{formatDate(dispatch.scheduledDate)}</td>
                  <td className="vp-po-muted-cell">{formatDate(dispatch.completedDate)}</td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      )}
    </>
  );
}