import type { KnowledgeEntryWithTags } from "@mosaic/shared";
import { EntryCard } from "./EntryCard";
import { BookOpen } from "lucide-react";

interface EntryListProps {
  entries: KnowledgeEntryWithTags[];
  isLoading: boolean;
  currentPage: number;
  totalPages: number;
  onPageChange: (page: number) => void;
}

export function EntryList({
  entries,
  isLoading,
  currentPage,
  totalPages,
  onPageChange,
}: EntryListProps): React.JSX.Element {
  if (isLoading) {
    return (
      <div className="flex justify-center items-center p-12">
        <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-blue-600"></div>
        <span className="ml-3 text-gray-600">Loading entries...</span>
      </div>
    );
  }

  if (entries.length === 0) {
    return (
      <div className="text-center p-12 bg-white rounded-lg shadow-sm border border-gray-200">
        <BookOpen className="w-12 h-12 text-gray-400 mx-auto mb-3" />
        <p className="text-lg text-gray-700 font-medium">No entries found</p>
        <p className="text-sm text-gray-500 mt-2">
          Try adjusting your filters or create a new entry
        </p>
      </div>
    );
  }

  return (
    <div className="space-y-6">
      {/* Entry cards */}
      <div className="space-y-4">
        {entries.map((entry) => (
          <EntryCard key={entry.id} entry={entry} />
        ))}
      </div>

      {/* Pagination */}
      {totalPages > 1 && (
        <div className="flex items-center justify-center gap-2 pt-6">
          <button
            onClick={() => {
              onPageChange(currentPage - 1);
            }}
            disabled={currentPage === 1}
            className="px-4 py-2 border border-gray-300 rounded-lg text-sm font-medium text-gray-700 hover:bg-gray-50 disabled:opacity-50 disabled:cursor-not-allowed transition-colors"
          >
            Previous
          </button>

          <div className="flex items-center gap-1">
            {Array.from({ length: totalPages }, (_, i) => i + 1).map((page) => {
              // Show first, last, current, and pages around current
              const shouldShow =
                page === 1 || page === totalPages || Math.abs(page - currentPage) <= 1;

              // Show ellipsis
              const showEllipsisBefore = page === currentPage - 2 && currentPage > 3;
              const showEllipsisAfter = page === currentPage + 2 && currentPage < totalPages - 2;

              if (!shouldShow && !showEllipsisBefore && !showEllipsisAfter) {
                return null;
              }

              if (showEllipsisBefore || showEllipsisAfter) {
                return (
                  <span key={`ellipsis-${String(page)}`} className="px-2 text-gray-500">
                    ...
                  </span>
                );
              }

              return (
                <button
                  key={page}
                  onClick={() => {
                    onPageChange(page);
                  }}
                  className={`px-3 py-2 rounded-lg text-sm font-medium transition-colors ${
                    page === currentPage
                      ? "bg-blue-600 text-white"
                      : "text-gray-700 hover:bg-gray-100"
                  }`}
                >
                  {page}
                </button>
              );
            })}
          </div>

          <button
            onClick={() => {
              onPageChange(currentPage + 1);
            }}
            disabled={currentPage === totalPages}
            className="px-4 py-2 border border-gray-300 rounded-lg text-sm font-medium text-gray-700 hover:bg-gray-50 disabled:opacity-50 disabled:cursor-not-allowed transition-colors"
          >
            Next
          </button>
        </div>
      )}

      {/* Results info */}
      <div className="text-center text-sm text-gray-500">
        Page {currentPage} of {totalPages} ({entries.length} entries)
      </div>
    </div>
  );
}