import { useMemo, useState } from "react";
import { useNavigate } from "react-router-dom";
import { useQuery } from "@tanstack/react-query";
import { useVendorPortal } from "@/app/v/_components/vendor-portal-context";
import { vendorPortalApi } from "@/domain/vendor-portal/api/vendor-portal-api";
import {
  formatVendorPortalDateTime,
  vendorPortalStatusClass,
} from "@/domain/vendor-portal/lib/status-helpers";
import type { VendorPortalDispatchSummary } from "@/domain/vendor-portal/types/vendor-portal";
import { queryKeys } from "@/infra/query-key/query-key";

const FILTERS = [
  {
    key: "open",
    label: "Open",
    match: (dispatch: VendorPortalDispatchSummary) =>
      dispatch.status !== "Completed" &&
      dispatch.status !== "Verified" &&
      dispatch.status !== "Cancelled",
  },
  {
    key: "completed",
    label: "Completed",
    match: (dispatch: VendorPortalDispatchSummary) =>
      dispatch.status === "Completed" || dispatch.status === "Verified",
  },
  {
    key: "cancelled",
    label: "Cancelled",
    match: (dispatch: VendorPortalDispatchSummary) => dispatch.status === "Cancelled",
  },
  { key: "all", label: "All", match: () => true },
] as const;

export default function VendorPortalDashboardPage() {
  const { token } = useVendorPortal();
  const navigate = useNavigate();
  const [filter, setFilter] = useState<(typeof FILTERS)[number]["key"]>("open");

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

  const activeFilter = FILTERS.find((item) => item.key === filter) ?? FILTERS[0];
  const filtered = useMemo(() => dispatches.filter(activeFilter.match), [dispatches, activeFilter]);

  return (
    <>
      <div className="vp-card">
        <h2>Your Work</h2>
        <div className="vp-muted" style={{ marginBottom: 12 }}>
          Active dispatches and work orders assigned to your company.
        </div>
        <div className="vp-actions" style={{ marginTop: 0 }}>
          {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>
          ))}
        </div>
      </div>

      {isLoading && <div className="vp-card vp-muted">Loading dispatches…</div>}
      {error && <div className="vp-error">{error.message}</div>}

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

      <div className="vp-dispatch-list">
        {filtered.map((dispatch) => (
          <div
            key={dispatch.id}
            className="vp-dispatch-card"
            onClick={() => navigate(`../dispatch/${dispatch.id}`)}
          >
            <div>
              <div className="vp-dispatch-title">
                {dispatch.dispatchNumber} — {dispatch.workOrderTitle || "(untitled)"}
              </div>
              <div className="vp-dispatch-meta">
                WO#{dispatch.internalWONumber}
                {dispatch.locationName ? ` · ${dispatch.locationName}` : ""}
                {dispatch.locationCity ? `, ${dispatch.locationCity}` : ""}
                {dispatch.locationState ? `, ${dispatch.locationState}` : ""}
                {dispatch.scheduledDate
                  ? ` · Scheduled ${formatVendorPortalDateTime(dispatch.scheduledDate)}`
                  : ""}
              </div>
            </div>
            <span className={vendorPortalStatusClass(dispatch.status)}>{dispatch.status}</span>
          </div>
        ))}
      </div>
    </>
  );
}