import 'package:flutter/material.dart';
import 'package:flutter_lucide/flutter_lucide.dart';
import 'package:marco/helpers/widgets/my_text.dart';
import 'package:marco/helpers/widgets/my_spacing.dart';
import 'package:marco/helpers/utils/mixins/ui_mixin.dart';

class FAQScreen extends StatefulWidget {
  const FAQScreen({super.key});

  @override
  State<FAQScreen> createState() => _FAQScreenState();
}

class _FAQScreenState extends State<FAQScreen> with UIMixin {
  final List<Map<String, String>> faqs = [
    {
      "question": "How do I perform Check-in and Check-out?",
      "answer":
          "To Check-in, go to the Dashboard and tap the 'Check-in' button. For Check-out, return to the Dashboard and tap 'Check-out'. Ensure GPS and internet are enabled."
    },
    {
      "question": "How do I login to the app?",
      "answer":
          "Enter your registered email and password on the login screen. If you forget your password, use the 'Forgot Password' option to reset it."
    },
    {
      "question": "What is MPIN and how do I use it?",
      "answer":
          "MPIN is a 4-digit security PIN used for quick login and authorization. Set it under 'Settings > Security'. Use it instead of typing your password every time."
    },
    {
      "question": "How do I log expenses?",
      "answer":
          "Go to the 'Expenses' section, click 'Add Expense', fill in the details like amount, category, and description, and then save. You can view all past expenses in the same section."
    },
    {
      "question": "Can I edit or delete an expense?",
      "answer":
          "Yes, tap on an expense from the list and choose 'Edit' or 'Delete'. Changes are synced automatically with your account."
    },
    {
      "question": "What if I face login issues?",
      "answer":
          "Ensure your internet is working and the app is updated. If problems persist, contact support via email or phone."
    },
  ];

  late List<bool> _expanded;
  final TextEditingController searchController = TextEditingController();
  String _searchQuery = "";

  @override
  void initState() {
    super.initState();
    _expanded = List.generate(faqs.length, (_) => false);
  }

  Widget _buildAppBar() {
    return AppBar(
      backgroundColor: const Color(0xFFF5F5F5),
      elevation: 0.5,
      automaticallyImplyLeading: false,
      titleSpacing: 0,
      title: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 16),
        child: Row(
          children: [
            IconButton(
              icon: const Icon(Icons.arrow_back_ios_new,
                  color: Colors.black, size: 20),
              onPressed: () => Navigator.pop(context),
            ),
            MySpacing.width(8),
            Expanded(
              child: MyText.titleLarge('FAQ',
                  fontWeight: 700, color: Colors.black),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildFAQCard(int index, Map<String, String> faq) {
    final isExpanded = _expanded[index];

    return GestureDetector(
      onTap: () {
        setState(() {
          _expanded[index] = !isExpanded;
        });
      },
      child: AnimatedContainer(
        duration: const Duration(milliseconds: 300),
        curve: Curves.easeInOut,
        padding: const EdgeInsets.all(20),
        margin: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
        decoration: BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.circular(5),
          boxShadow: const [
            BoxShadow(
              color: Colors.black12,
              blurRadius: 12,
              offset: Offset(0, 6),
            ),
          ],
        ),
        child: Row(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Container(
              padding: const EdgeInsets.all(12),
              decoration: BoxDecoration(
                color: Colors.blue.withOpacity(0.1),
                shape: BoxShape.circle,
              ),
              child: const Icon(LucideIcons.badge_help,
                  color: Colors.blue, size: 24),
            ),
            const SizedBox(width: 16),
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  MyText.bodyMedium(
                    faq["question"] ?? "",
                    fontWeight: 600,
                    color: Colors.black87,
                    fontSize: 14,
                  ),
                  const SizedBox(height: 8),
                  AnimatedCrossFade(
                    firstChild: const SizedBox.shrink(),
                    secondChild: MyText.bodySmall(
                      faq["answer"] ?? "",
                      color: Colors.black54,
                    ),
                    crossFadeState: isExpanded
                        ? CrossFadeState.showSecond
                        : CrossFadeState.showFirst,
                    duration: const Duration(milliseconds: 300),
                  ),
                ],
              ),
            ),
            Icon(
              isExpanded ? Icons.keyboard_arrow_up : Icons.keyboard_arrow_down,
              color: Colors.grey[600],
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildEmptyState() {
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          const Icon(Icons.help_outline, size: 60, color: Colors.grey),
          MySpacing.height(18),
          MyText.titleMedium(
            'No matching FAQs found.',
            fontWeight: 600,
            color: Colors.grey,
          ),
          MySpacing.height(10),
          MyText.bodySmall(
            'Try adjusting your search or clear the search bar.',
            color: Colors.grey,
          ),
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    final filteredFaqs = faqs
        .asMap()
        .entries
        .where((entry) =>
            entry.value["question"]!
                .toLowerCase()
                .contains(_searchQuery.toLowerCase()) ||
            entry.value["answer"]!
                .toLowerCase()
                .contains(_searchQuery.toLowerCase()))
        .toList();

    return Scaffold(
      backgroundColor: Colors.grey[100],
      appBar: PreferredSize(
        preferredSize: const Size.fromHeight(72),
        child: _buildAppBar(),
      ),
      body: Column(
        children: [
          // Search bar
          Padding(
            padding: const EdgeInsets.all(12.0),
            child: SizedBox(
              height: 40,
              child: TextField(
                controller: searchController,
                onChanged: (value) {
                  setState(() {
                    _searchQuery = value;
                  });
                },
                decoration: InputDecoration(
                  contentPadding:
                      const EdgeInsets.symmetric(horizontal: 12, vertical: 0),
                  prefixIcon:
                      const Icon(Icons.search, size: 20, color: Colors.grey),
                  suffixIcon: ValueListenableBuilder<TextEditingValue>(
                    valueListenable: searchController,
                    builder: (context, value, _) {
                      if (value.text.isEmpty) return const SizedBox.shrink();
                      return IconButton(
                        icon: const Icon(Icons.clear,
                            size: 20, color: Colors.grey),
                        onPressed: () {
                          searchController.clear();
                          setState(() {
                            _searchQuery = "";
                          });
                        },
                      );
                    },
                  ),
                  hintText: 'Search FAQs...',
                  filled: true,
                  fillColor: Colors.white,
                  border: OutlineInputBorder(
                    borderRadius: BorderRadius.circular(8),
                    borderSide: BorderSide(color: Colors.grey.shade300),
                  ),
                  enabledBorder: OutlineInputBorder(
                    borderRadius: BorderRadius.circular(8),
                    borderSide: BorderSide(color: Colors.grey.shade300),
                  ),
                ),
              ),
            ),
          ),
          Expanded(
            child: filteredFaqs.isEmpty
                ? _buildEmptyState()
                : SingleChildScrollView(
                    physics: const AlwaysScrollableScrollPhysics(),
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        // Introductory text
                        Padding(
                          padding: const EdgeInsets.symmetric(
                              horizontal: 16, vertical: 12),
                          child: MyText.bodyMedium(
                            'Here are some frequently asked questions to help you get started:',
                            fontWeight: 500,
                            color: Colors.black87,
                          ),
                        ),
                        ...filteredFaqs
                            .map((entry) =>
                                _buildFAQCard(entry.key, entry.value))
                            .toList(),
                        const SizedBox(height: 24),
                      ],
                    ),
                  ),
          ),
        ],
      ),
    );
  }
}