import { useState, useEffect, useMemo, useRef } from "react";
import { createPortal } from "react-dom";
import { trpc } from "~/lib/trpc/client.js";
import { useAnchoredOverlay } from "~/hooks/useAnchoredOverlay.js";

export function ResourcePersonPicker({
  value,
  onChange,
}: {
  value: string;
  onChange: (v: string) => void;
}) {
  const [query, setQuery] = useState(value);
  const [open, setOpen] = useState(false);
  const [debouncedSearch, setDebouncedSearch] = useState("");
  const [isConfirmed, setIsConfirmed] = useState(false);
  const inputRef = useRef<HTMLInputElement>(null);

  useEffect(() => {
    const timer = setTimeout(() => setDebouncedSearch(query), 200);
    return () => clearTimeout(timer);
  }, [query]);

  const { data } = trpc.resource.directory.useQuery(
    { isActive: true, search: debouncedSearch || undefined, limit: 30 },
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    { staleTime: 15_000, placeholderData: (prev: any) => prev },
  );
  const filtered = useMemo(
    () =>
      (data?.resources ?? []) as unknown as Array<{ id: string; displayName: string; eid: string }>,
    [data],
  );

  useEffect(() => {
    setQuery(value);
    if (!value) setIsConfirmed(false);
  }, [value]);

  const { panelRef, position } = useAnchoredOverlay<HTMLInputElement>({
    open,
    onClose: () => setOpen(false),
    align: "start",
    matchTriggerWidth: true,
    triggerRef: inputRef,
  });

  return (
    <div className="relative">
      <input
        ref={inputRef}
        type="text"
        value={query}
        onChange={(e) => {
          setQuery(e.target.value);
          onChange(e.target.value);
          setIsConfirmed(false);
          setOpen(true);
        }}
        onFocus={() => setOpen(true)}
        placeholder="Search by name or EID…"
        className={`app-input ${isConfirmed ? "ring-2 ring-green-400 ring-offset-0" : ""}`}
      />
      {isConfirmed && (
        <span className="pointer-events-none absolute right-2.5 top-1/2 -translate-y-1/2 text-green-500">
          <svg className="h-4 w-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
            <path
              strokeLinecap="round"
              strokeLinejoin="round"
              strokeWidth={2.5}
              d="M5 13l4 4L19 7"
            />
          </svg>
        </span>
      )}
      {open && filtered.length > 0 && typeof document !== "undefined"
        ? createPortal(
            <div
              ref={panelRef}
              className="fixed z-[9998] max-h-48 overflow-y-auto rounded-lg border border-gray-200 bg-white shadow-lg"
              style={{
                top: position.top,
                left: position.left,
                width: position.minWidth,
              }}
              onMouseDown={(e) => e.preventDefault()}
            >
              <ul>
                {filtered.map((r) => (
                  <li key={r.id}>
                    <button
                      type="button"
                      onMouseDown={() => {
                        onChange(r.displayName);
                        setQuery(r.displayName);
                        setIsConfirmed(true);
                        setOpen(false);
                      }}
                      className="flex w-full items-baseline gap-2 px-3 py-2 text-left text-sm transition-colors hover:bg-gray-50"
                    >
                      <span className="truncate">{r.displayName}</span>
                      <span className="shrink-0 font-mono text-xs text-gray-400">{r.eid}</span>
                    </button>
                  </li>
                ))}
              </ul>
            </div>,
            document.body,
          )
        : null}
    </div>
  );
}