import 'dart:io';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:provider/provider.dart';
import 'package:twilio_voice/twilio_voice.dart';
import '../models/queue_state.dart';
import '../providers/agent_provider.dart';
import '../providers/auth_provider.dart';
import '../providers/call_provider.dart';
import '../widgets/agent_status_toggle.dart';
import '../widgets/dialpad.dart';
import '../widgets/queue_card.dart';
import 'settings_screen.dart';

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

  @override
  State<DashboardScreen> createState() => _DashboardScreenState();
}

class _DashboardScreenState extends State<DashboardScreen> {
  bool _phoneAccountEnabled = true; // assume true until checked

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      context.read<AgentProvider>().refresh();
      _checkPhoneAccount();
    });
  }

  Future<void> _checkPhoneAccount() async {
    if (!kIsWeb && Platform.isAndroid) {
      final enabled = await TwilioVoice.instance.isPhoneAccountEnabled();
      if (mounted && !enabled) {
        setState(() => _phoneAccountEnabled = false);
        _showPhoneAccountDialog();
      } else if (mounted) {
        setState(() => _phoneAccountEnabled = true);
      }
    }
  }

  void _showPhoneAccountDialog() {
    showDialog(
      context: context,
      barrierDismissible: false,
      builder: (ctx) => AlertDialog(
        title: const Text('Enable Phone Account'),
        content: const Text(
          'TWP Softphone needs to be enabled as a calling account to make and receive calls.\n\n'
          'Tap "Open Settings" below, then find "TWP Softphone" in the list and toggle it ON.',
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(ctx),
            child: const Text('Later'),
          ),
          FilledButton(
            onPressed: () async {
              Navigator.pop(ctx);
              await TwilioVoice.instance.openPhoneAccountSettings();
              // Poll until enabled or user comes back
              for (int i = 0; i < 30; i++) {
                await Future.delayed(const Duration(seconds: 1));
                if (!mounted) return;
                final enabled = await TwilioVoice.instance.isPhoneAccountEnabled();
                if (enabled) {
                  setState(() => _phoneAccountEnabled = true);
                  return;
                }
              }
              // Re-check one more time when coming back
              _checkPhoneAccount();
            },
            child: const Text('Open Settings'),
          ),
        ],
      ),
    );
  }

  void _showDialer(BuildContext context) {
    final numberController = TextEditingController();
    final phoneNumbers = context.read<AgentProvider>().phoneNumbers;
    // Auto-select first phone number as caller ID
    String? selectedCallerId =
        phoneNumbers.isNotEmpty ? phoneNumbers.first.phoneNumber : null;

    showModalBottomSheet(
      context: context,
      isScrollControlled: true,
      shape: const RoundedRectangleBorder(
        borderRadius: BorderRadius.vertical(top: Radius.circular(16)),
      ),
      builder: (ctx) {
        return StatefulBuilder(
          builder: (ctx, setSheetState) {
            return Padding(
              padding: EdgeInsets.only(
                bottom: MediaQuery.of(ctx).viewInsets.bottom,
                top: 16,
                left: 16,
                right: 16,
              ),
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  // Number display
                  TextField(
                    controller: numberController,
                    keyboardType: TextInputType.phone,
                    autofillHints: const [AutofillHints.telephoneNumber],
                    textAlign: TextAlign.center,
                    style: Theme.of(ctx).textTheme.headlineSmall,
                    decoration: InputDecoration(
                      hintText: 'Enter phone number',
                      suffixIcon: IconButton(
                        icon: const Icon(Icons.backspace_outlined),
                        onPressed: () {
                          final text = numberController.text;
                          if (text.isNotEmpty) {
                            numberController.text =
                                text.substring(0, text.length - 1);
                            numberController.selection = TextSelection.fromPosition(
                              TextPosition(offset: numberController.text.length),
                            );
                          }
                        },
                      ),
                    ),
                  ),
                  // Caller ID selector (only if multiple numbers)
                  if (phoneNumbers.length > 1) ...[
                    const SizedBox(height: 12),
                    DropdownButtonFormField<String>(
                      initialValue: selectedCallerId,
                      decoration: const InputDecoration(
                        labelText: 'Caller ID',
                        isDense: true,
                        contentPadding: EdgeInsets.symmetric(horizontal: 12, vertical: 8),
                      ),
                      items: phoneNumbers.map((p) => DropdownMenuItem<String>(
                            value: p.phoneNumber,
                            child: Text('${p.friendlyName} (${p.phoneNumber})'),
                          )).toList(),
                      onChanged: (value) {
                        setSheetState(() {
                          selectedCallerId = value;
                        });
                      },
                    ),
                  ] else if (phoneNumbers.length == 1) ...[
                    const SizedBox(height: 8),
                    Text(
                      'Caller ID: ${phoneNumbers.first.phoneNumber}',
                      style: Theme.of(ctx).textTheme.bodySmall?.copyWith(
                            color: Theme.of(ctx).colorScheme.onSurfaceVariant,
                          ),
                    ),
                  ],
                  const SizedBox(height: 16),
                  // Dialpad
                  Dialpad(
                    onDigit: (digit) {
                      numberController.text += digit;
                      numberController.selection = TextSelection.fromPosition(
                        TextPosition(offset: numberController.text.length),
                      );
                    },
                    onClose: () => Navigator.pop(ctx),
                  ),
                  const SizedBox(height: 8),
                  // Call button
                  ElevatedButton.icon(
                    style: ElevatedButton.styleFrom(
                      backgroundColor: Colors.green,
                      foregroundColor: Colors.white,
                      minimumSize: const Size(double.infinity, 48),
                      shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(24),
                      ),
                    ),
                    icon: const Icon(Icons.call),
                    label: const Text('Call'),
                    onPressed: () {
                      final number = numberController.text.trim();
                      if (number.isEmpty) return;
                      if (selectedCallerId == null) {
                        ScaffoldMessenger.of(context).showSnackBar(
                          const SnackBar(content: Text('No caller ID available. Add a phone number first.')),
                        );
                        return;
                      }
                      context.read<CallProvider>().makeCall(number, callerId: selectedCallerId);
                      Navigator.pop(ctx);
                    },
                  ),
                  const SizedBox(height: 16),
                ],
              ),
            );
          },
        );
      },
    );
  }

  void _showQueueCalls(BuildContext context, QueueInfo queue) {
    final voiceService = context.read<AuthProvider>().voiceService;
    final callProvider = context.read<CallProvider>();

    showModalBottomSheet(
      context: context,
      shape: const RoundedRectangleBorder(
        borderRadius: BorderRadius.vertical(top: Radius.circular(16)),
      ),
      builder: (ctx) {
        return FutureBuilder<List<Map<String, dynamic>>>(
          future: voiceService.getQueueCalls(queue.id),
          builder: (context, snapshot) {
            if (snapshot.connectionState == ConnectionState.waiting) {
              return const Padding(
                padding: EdgeInsets.all(32),
                child: Center(child: CircularProgressIndicator()),
              );
            }

            if (snapshot.hasError) {
              return Padding(
                padding: const EdgeInsets.all(24),
                child: Center(
                  child: Text('Error loading calls: ${snapshot.error}'),
                ),
              );
            }

            final calls = (snapshot.data ?? [])
                .map((c) => QueueCall.fromJson(c))
                .toList();

            if (calls.isEmpty) {
              return const Padding(
                padding: EdgeInsets.all(24),
                child: Center(child: Text('No calls waiting')),
              );
            }

            return Padding(
              padding: const EdgeInsets.symmetric(vertical: 16),
              child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Padding(
                    padding: const EdgeInsets.symmetric(horizontal: 16),
                    child: Text(
                      '${queue.name} - Waiting Calls',
                      style: Theme.of(context).textTheme.titleMedium,
                    ),
                  ),
                  const SizedBox(height: 8),
                  ...calls.map((call) => ListTile(
                        leading: const CircleAvatar(
                          child: Icon(Icons.phone_in_talk),
                        ),
                        title: Text(call.fromNumber),
                        subtitle: Text('Waiting ${_formatWaitTime(call.waitTime)}'),
                        trailing: FilledButton.icon(
                          icon: const Icon(Icons.call, size: 18),
                          label: const Text('Accept'),
                          onPressed: () {
                            Navigator.pop(ctx);
                            callProvider.acceptQueueCall(call.callSid);
                            // Cancel queue alert notification
                            FlutterLocalNotificationsPlugin().cancel(9001);
                          },
                        ),
                      )),
                ],
              ),
            );
          },
        );
      },
    );
  }

  String _formatWaitTime(int seconds) {
    if (seconds < 60) return '${seconds}s';
    final minutes = seconds ~/ 60;
    final secs = seconds % 60;
    return '${minutes}m ${secs}s';
  }

  @override
  Widget build(BuildContext context) {
    final agent = context.watch<AgentProvider>();

    // Android Telecom framework handles the call UI via the native InCallUI,
    // so we don't navigate to our own ActiveCallScreen.

    return Scaffold(
      appBar: AppBar(
        title: const Text('TWP Softphone'),
        actions: [
          // SSE connection indicator
          Padding(
            padding: const EdgeInsets.only(right: 8),
            child: Icon(
              Icons.circle,
              size: 12,
              color: agent.sseConnected ? Colors.green : Colors.red,
            ),
          ),
          IconButton(
            icon: const Icon(Icons.settings),
            onPressed: () => Navigator.push(context,
                MaterialPageRoute(builder: (_) => const SettingsScreen())),
          ),
        ],
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () => _showDialer(context),
        child: const Icon(Icons.phone),
      ),
      body: RefreshIndicator(
        onRefresh: () => agent.refresh(),
        child: ListView(
          padding: const EdgeInsets.all(16),
          children: [
            if (!_phoneAccountEnabled)
              Card(
                color: Colors.orange.shade50,
                child: ListTile(
                  leading: Icon(Icons.warning, color: Colors.orange.shade700),
                  title: const Text('Phone Account Not Enabled'),
                  subtitle: const Text('Tap to enable calling in settings'),
                  trailing: const Icon(Icons.chevron_right),
                  onTap: () => _showPhoneAccountDialog(),
                ),
              ),
            if (!_phoneAccountEnabled) const SizedBox(height: 8),
            const AgentStatusToggle(),
            const SizedBox(height: 24),
            Text('Queues',
                style: Theme.of(context).textTheme.titleMedium),
            const SizedBox(height: 8),
            if (agent.queues.isEmpty)
              const Card(
                child: Padding(
                  padding: EdgeInsets.all(24),
                  child: Center(child: Text('No queues assigned')),
                ),
              )
            else
              ...agent.queues.map((q) => Padding(
                    padding: const EdgeInsets.only(bottom: 8),
                    child: QueueCard(
                      queue: q,
                      onTap: q.waitingCount > 0
                          ? () => _showQueueCalls(context, q)
                          : null,
                    ),
                  )),
          ],
        ),
      ),
    );
  }
}