import 'package:flutter/material.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';
import 'package:shared_preferences/shared_preferences.dart';
import '../../../core/constants/colors.dart';
import '../../../core/constants/api_constants.dart';

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

  @override
  State<ChannelsScreen> createState() => _ChannelsScreenState();
}

class _ChannelsScreenState extends State<ChannelsScreen> {
  List<dynamic> _channels = [];
  Map<String, dynamic>? _accountData;
  bool _isLoading = true;
  String? _connectedChannelId;

  @override
  void initState() {
    super.initState();
    _loadData();
  }

  Future<void> _loadData() async {
    setState(() => _isLoading = true);
    try {
      final prefs = await SharedPreferences.getInstance();
      final email = prefs.getString('user_email');
      _connectedChannelId = prefs.getString('connectedChannel');

      final response = await http.get(
        Uri.parse('${ApiConstants.liveBaseUrl}/social/channels?userId=$email'),
      );
      
      if (response.statusCode == 200) {
        _channels = jsonDecode(response.body);
      }

      if (_connectedChannelId != null) {
        await _loadAccountDetails();
      }
    } catch (e) {
      print("Error loading channels: $e");
    } finally {
      setState(() => _isLoading = false);
    }
  }

  Future<void> _loadAccountDetails() async {
    try {
      final prefs = await SharedPreferences.getInstance();
      final email = prefs.getString('user_email');
      final response = await http.get(
        Uri.parse('${ApiConstants.liveBaseUrl}/social/account?userId=$email'),
      );
      if (response.statusCode == 200) {
        _accountData = jsonDecode(response.body);
      }
    } catch (e) {
      print("Error loading account details: $e");
    }
  }

  Future<void> _connectChannel(String channelId, String channelName) async {
    setState(() => _isLoading = true);
    try {
      final prefs = await SharedPreferences.getInstance();
      final email = prefs.getString('user_email');
      
      final response = await http.post(
        Uri.parse('${ApiConstants.liveBaseUrl}/social/connect?userId=$email'),
        headers: {'Content-Type': 'application/json'},
        body: jsonEncode({'channel_id': channelId}),
      );

      if (response.statusCode == 200) {
        final data = jsonDecode(response.body);
        final savedId = data['data']['channel_id'] ?? channelId;
        await prefs.setString('connectedChannel', savedId);
        setState(() => _connectedChannelId = savedId);
        await _loadAccountDetails();
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text("$channelName connected successfully!")),
        );
      }
    } catch (e) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text("Failed to connect $channelName")),
      );
    } finally {
      setState(() => _isLoading = false);
    }
  }

  Future<void> _removeChannel() async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.remove('connectedChannel');
    setState(() {
      _connectedChannelId = null;
      _accountData = null;
    });
    ScaffoldMessenger.of(context).showSnackBar(
      const SnackBar(content: Text("Channel removed successfully!")),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: AppColors.darkBg,
      body: _isLoading 
        ? const Center(child: CircularProgressIndicator(color: AppColors.primary))
        : _connectedChannelId != null 
          ? _buildAccountDetails()
          : _buildChannelSelection(),
    );
  }

  Widget _buildAccountDetails() {
    if (_accountData == null) {
      return const Center(child: CircularProgressIndicator(color: AppColors.primary));
    }

    return SingleChildScrollView(
      padding: const EdgeInsets.all(24),
      child: Column(
        children: [
          Container(
            padding: const EdgeInsets.all(24),
            decoration: BoxDecoration(
              color: AppColors.cardBg,
              borderRadius: BorderRadius.circular(30),
              border: Border.all(color: Colors.white.withOpacity(0.1)),
            ),
            child: Column(
              children: [
                CircleAvatar(
                  radius: 60,
                  backgroundImage: NetworkImage(_accountData!['profile_picture_url'] ?? ''),
                ),
                const SizedBox(height: 20),
                Text(
                  _accountData!['username'] ?? 'User',
                  style: GoogleFonts.nunito(
                    fontSize: 24,
                    fontWeight: FontWeight.bold,
                    color: Colors.white,
                  ),
                ),
                const SizedBox(height: 20),
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceAround,
                  children: [
                    _buildStatItem(_accountData!['media_count'].toString(), "Posts"),
                    _buildStatItem(_accountData!['followers_count'].toString(), "Followers"),
                    _buildStatItem(_accountData!['follows_count'].toString(), "Following"),
                  ],
                ),
                const SizedBox(height: 24),
                if (_accountData!['biography'] != null)
                  Text(
                    _accountData!['biography'],
                    textAlign: TextAlign.center,
                    style: GoogleFonts.nunito(color: Colors.white70),
                  ),
                const SizedBox(height: 32),
                SizedBox(
                  width: double.infinity,
                  child: ElevatedButton(
                    onPressed: _removeChannel,
                    style: ElevatedButton.styleFrom(
                      backgroundColor: Colors.red.shade700,
                      padding: const EdgeInsets.symmetric(vertical: 16),
                      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
                    ),
                    child: const Text("Remove Channel"),
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildStatItem(String value, String label) {
    return Column(
      children: [
        Text(value, style: const TextStyle(fontSize: 20, fontWeight: FontWeight.bold, color: Colors.white)),
        Text(label, style: const TextStyle(fontSize: 12, color: Colors.white54)),
      ],
    );
  }

  Widget _buildChannelSelection() {
    return ListView.builder(
      padding: const EdgeInsets.all(24),
      itemCount: _channels.length,
      itemBuilder: (context, index) {
        final ch = _channels[index];
        final hasLinked = ch['has_linked_account'] == true;
        return Container(
          margin: const EdgeInsets.only(bottom: 16),
          padding: const EdgeInsets.all(20),
          decoration: BoxDecoration(
            color: AppColors.cardBg,
            borderRadius: BorderRadius.circular(20),
            border: Border.all(color: Colors.white.withOpacity(0.1)),
          ),
          child: Column(
            children: [
              Text(
                ch['name'],
                style: GoogleFonts.nunito(fontSize: 20, fontWeight: FontWeight.bold, color: Colors.white),
              ),
              const SizedBox(height: 16),
              SizedBox(
                width: double.infinity,
                child: ElevatedButton(
                  onPressed: hasLinked ? () => _connectChannel(ch['id'], ch['name']) : null,
                  style: ElevatedButton.styleFrom(
                    backgroundColor: hasLinked ? AppColors.primary : Colors.grey.shade800,
                    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
                  ),
                  child: Text(hasLinked ? "Connect" : "Not Linked"),
                ),
              ),
            ],
          ),
        );
      },
    );
  }
}