"use client";

import { useState, useEffect, useRef, useCallback } from "react";
import { cn } from "@/lib/utils";

export interface ChatSectionHeaderProps {
  title: string;
  isExpanded: boolean;
  onToggle: () => void;
  onAdd?: () => void;
  onMore?: () => void;
  className?: string;
}

export function ChatSectionHeader({
  title,
  isExpanded,
  onToggle,
  onAdd,
  onMore,
  className = "",
}: ChatSectionHeaderProps) {
  const disclosureButtonRef = useRef<HTMLButtonElement>(null);

  const handleDisclosureClick = useCallback(() => {
    onToggle();
  }, [onToggle]);

  const handleAddClick = useCallback((e: React.MouseEvent) => {
    e.stopPropagation();
    onAdd && onAdd();
  }, [onAdd]);

  const handleMoreClick = useCallback((e: React.MouseEvent) => {
    e.stopPropagation();
    onMore && onMore();
  }, [onMore]);

  return (
    <div
      className={cn(
        "flex items-center justify-between py-2 px-3 border-b border-sidebar-border bg-background/30",
        "hover:bg-background/5 transition-colors",
        className
      )}
    >
      <div className="flex items-center space-x-2">
        <button
          ref={disclosureButtonRef}
          type="button"
          onClick={handleDisclosureClick}
          className={cn(
            "flex items-center justify-center w-6 h-6 rounded",
            "hover:bg-accent focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500",
            "transition-colors"
          )}
          aria-expanded={isExpanded}
          aria-label={isExpanded ? "Collapse section" : "Expand section"}
        >
          {isExpanded ? (
            <svg
              xmlns="http://www.w3.org/2000/svg"
              className="h-4 w-4"
              fill="none"
              viewBox="0 0 24 24"
              stroke="currentColor"
            >
              <path
                strokeLinecap="round"
                strokeLinejoin="round"
                strokeWidth="2"
                d="M19 9l-7 7-7-7"
              />
            </svg>
          ) : (
            <svg
              xmlns="http://www.w3.org/2000/svg"
              className="h-4 w-4"
              fill="none"
              viewBox="0 0 24 24"
              stroke="currentColor"
            >
              <path
                strokeLinecap="round"
                strokeLinejoin="round"
                strokeWidth="2"
                d="M4 6h16M4 12h16M4 18h16"
              />
            </svg>
          )}
        </button>
        <span className="font-medium text-sm text-foreground">{title}</span>
      </div>
      <div className="flex items-center space-x-1">
        {onAdd && (
          <button
            type="button"
            onClick={handleAddClick}
            className={cn(
              "inline-flex items-center px-2 py-0.5 text-xs font-medium rounded",
              "text-indigo-600 hover:bg-indigo-600 hover:text-white",
              "focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500",
              "transition-colors"
            )}
          >
            Add
          </button>
        )}
        {onMore && (
          <button
            type="button"
            onClick={handleMoreClick}
            className={cn(
              "inline-flex items-center px-2 py-0.5 text-xs font-medium rounded",
              "text-gray-500 hover:bg-accent hover:text-foreground",
              "focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-gray-500",
              "transition-colors"
            )}
          >
            ⋯
          </button>
        )}
      </div>
    </div>
  );
}