import 'package:flutter/material.dart';

class Sidebar extends StatelessWidget {
  final bool isSidebarOpen;
  final String selectedPage;
  final Function(String) onPageChanged;

  const Sidebar({
    super.key,
    required this.isSidebarOpen,
    required this.selectedPage,
    required this.onPageChanged,
  });

  @override
  Widget build(BuildContext context) {
    return Container(
      width: 260,
      color: const Color(0xFF181C22), // 어두운 테마 배경색 유지
      padding: const EdgeInsets.symmetric(vertical: 24.0, horizontal: 8.0),
      child: AnimatedOpacity(
        duration: const Duration(milliseconds: 200),
        curve: isSidebarOpen ? const Interval(0.6, 1.0, curve: Curves.easeIn) : Curves.easeOut,
        opacity: isSidebarOpen ? 1.0 : 0.0,
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            // 최상단 앱 타이틀
            const Padding(
              padding: EdgeInsets.symmetric(horizontal: 16.0),
              child: Text(
                'Smart Garden',
                style: TextStyle(
                  fontSize: 24,
                  fontWeight: FontWeight.bold,
                  color: Color(0xFFB4E49C), // 페이모바일 포인트 컬러 유지
                ),
              ),
            ),
            const SizedBox(height: 32),

            // 📜 대분류 및 하위 메뉴 영역
            Expanded(
              child: ListView(
                physics: const BouncingScrollPhysics(),
                children: [
                  // 1. Dashboard 그룹
                  _buildExpansionMenu(
                    icon: Icons.dashboard_outlined,
                    title: 'Dashboard',
                    children: [
                      _buildSubMenuItem('스마트가든 챗봇'),
                    ],
                  ),

                  // 2. 데이터 조회 그룹
                  _buildExpansionMenu(
                    icon: Icons.analytics_outlined,
                    title: '데이터 조회',
                    initiallyExpanded: true, // 자주 보는 데이터 조회를 기본으로 열어둡니다.
                    children: [
                      _buildSubMenuItem('온도 데이터'),
                      _buildSubMenuItem('습도 데이터'),
                      _buildSubMenuItem('이산화탄소 데이터'),
                      _buildSubMenuItem('TVOC 데이터'),
                      _buildSubMenuItem('미세먼지 데이터'),
                    ],
                  ),

                  // 3. 장비 관리 (하위 메뉴가 없는 단일 대분류 버튼)
                  _buildSingleMenu(
                    icon: Icons.widgets_outlined,
                    title: '장비 관리',
                  ),
                ],
              ),
            ),

            // 하단 로그아웃 버튼
            Padding(
              padding: const EdgeInsets.symmetric(horizontal: 16.0),
              child: SizedBox(
                width: double.infinity,
                child: ElevatedButton(
                  onPressed: () {},
                  style: ElevatedButton.styleFrom(
                    backgroundColor: const Color(0xFFB4E49C),
                    foregroundColor: Colors.black,
                    padding: const EdgeInsets.symmetric(vertical: 14),
                    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
                  ),
                  child: const Text('Log Out', style: TextStyle(fontWeight: FontWeight.bold)),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }

  // ✨ 그룹형 (대분류 > 소분류) 메뉴를 만드는 빌더
  Widget _buildExpansionMenu({
    required IconData icon,
    required String title,
    required List<Widget> children,
    bool initiallyExpanded = false,
  }) {
    return Theme(
      // ExpansionTile 고유의 상하단 구분선(Border)을 제거하는 테마 트릭
      data: ThemeData.dark().copyWith(dividerColor: Colors.transparent),
      child: ExpansionTile(
        initiallyExpanded: initiallyExpanded,
        leading: Icon(icon, color: Colors.white70, size: 22),
        title: Text(
          title,
          style: const TextStyle(color: Colors.white, fontSize: 15, fontWeight: FontWeight.bold),
        ),
        trailing: const Icon(Icons.keyboard_arrow_down, color: Colors.white38, size: 18),
        childrenPadding: const EdgeInsets.only(left: 16.0), // 하위 메뉴 들여쓰기 구조 설정
        children: children,
      ),
    );
  }

  // ✨ 하위(소분류) 메뉴 아이템 빌더
  Widget _buildSubMenuItem(String title) {
    bool isSelected = (title == selectedPage);

    return Container(
      margin: const EdgeInsets.symmetric(vertical: 2, horizontal: 8),
      decoration: BoxDecoration(
        color: isSelected ? const Color(0xFFB4E49C).withOpacity(0.15) : Colors.transparent,
        borderRadius: BorderRadius.circular(8),
      ),
      child: ListTile(
        title: Text(
          title,
          style: TextStyle(
            color: isSelected ? const Color(0xFFB4E49C) : Colors.white60,
            fontSize: 14,
            fontWeight: isSelected ? FontWeight.bold : FontWeight.normal,
          ),
        ),
        dense: true,
        visualDensity: const VisualDensity(vertical: -2), // 메뉴 간격을 좀 더 콤팩트하게 조절
        onTap: () => onPageChanged(title),
      ),
    );
  }

  // ✨ 하위 메뉴가 없는 단독 대분류 메뉴 빌더 (ex: 장비 관리)
  Widget _buildSingleMenu({required IconData icon, required String title}) {
    bool isSelected = (title == selectedPage);

    return Container(
      margin: const EdgeInsets.symmetric(vertical: 4, horizontal: 8),
      decoration: BoxDecoration(
        color: isSelected ? const Color(0xFFB4E49C).withOpacity(0.15) : Colors.transparent,
        borderRadius: BorderRadius.circular(8),
      ),
      child: ListTile(
        leading: Icon(icon, color: isSelected ? const Color(0xFFB4E49C) : Colors.white70, size: 22),
        title: Text(
          title,
          style: TextStyle(
            color: isSelected ? const Color(0xFFB4E49C) : Colors.white,
            fontSize: 15,
            fontWeight: FontWeight.bold,
          ),
        ),
        dense: true,
        onTap: () => onPageChanged(title),
      ),
    );
  }
}