"use client";

import { ChevronRight, Home } from "lucide-react";
import { Fragment, useEffect } from "react";
import { useCatalogManager } from "./use-catalog-store";

export function BreadcrumbBar() {
  const { state, dispatch } = useCatalogManager();
  const { selectedPageId, ancestors } = state;

  useEffect(() => {
    if (!selectedPageId || selectedPageId <= 0) {
      dispatch({ type: "SET_ANCESTORS", ancestors: [] });
      return;
    }
    const ac = new AbortController();
    fetch(`/api/admin/catalog/tree?ancestors=${selectedPageId}`, { signal: ac.signal })
      .then((r) => r.json())
      .then((d) => {
        if (!ac.signal.aborted) {
          dispatch({ type: "SET_ANCESTORS", ancestors: d.ancestors ?? [] });
        }
      })
      .catch(() => {});
    return () => ac.abort();
  }, [selectedPageId, dispatch]);

  if (!selectedPageId || ancestors.length === 0) return null;

  return (
    <div className="flex items-center gap-1 px-4 py-1 border-b bg-muted/20 text-xs text-muted-foreground overflow-x-auto shrink-0">
      <Home className="h-3 w-3 shrink-0" />
      {ancestors.map((a) => (
        <Fragment key={a.id}>
          <ChevronRight className="h-3 w-3 shrink-0" />
          <button
            type="button"
            onClick={() => dispatch({ type: "SELECT_PAGE", id: a.id })}
            className="shrink-0 hover:text-foreground transition-colors truncate max-w-40"
          >
            {a.caption}
          </button>
        </Fragment>
      ))}
      {/* Current page */}
      {(() => {
        const node = state.nodes.get(selectedPageId);
        if (!node) return null;
        return (
          <>
            <ChevronRight className="h-3 w-3 shrink-0" />
            <span className="shrink-0 text-foreground font-medium truncate max-w-40">{node.caption}</span>
          </>
        );
      })()}
    </div>
  );
}