import 'package:flutter/material.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';
import 'package:provider/provider.dart';
import 'package:simplecloudnotifier/api/api_client.dart';
import 'package:simplecloudnotifier/models/keytoken.dart';
import 'package:simplecloudnotifier/models/scan_result.dart';
import 'package:simplecloudnotifier/models/user.dart';
import 'package:simplecloudnotifier/state/app_auth.dart';
import 'package:simplecloudnotifier/state/application_log.dart';
import 'package:simplecloudnotifier/utils/toaster.dart';
import 'package:simplecloudnotifier/utils/ui.dart';
import 'package:url_launcher/url_launcher.dart';

class ChannelScannerResultMessageSend extends StatefulWidget {
  final ScanResultMessageSend value;

  const ChannelScannerResultMessageSend({required this.value}) : super();

  @override
  State<ChannelScannerResultMessageSend> createState() => _ChannelScannerResultMessageSendState();
}

class _ChannelScannerResultMessageSendState extends State<ChannelScannerResultMessageSend> {
  Future<(UserPreview, KeyTokenPreview?)?> _fetchDataFuture;

  _ChannelScannerResultMessageSendState() : _fetchDataFuture = Future.value(null); // Initial dummy future

  late TextEditingController _ctrlMessage;

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

    _ctrlMessage = TextEditingController();

    final auth = Provider.of<AppAuth>(context, listen: false);
    setState(() {
      _fetchDataFuture = _fetchData(auth);
    });
  }

  @override
  void dispose() {
    _ctrlMessage.dispose();
    super.dispose();
  }

  Future<(UserPreview, KeyTokenPreview?)?> _fetchData(AppAuth auth) async {
    UserPreview? user = null;
    try {
      user = await APIClient.getUserPreview(auth, widget.value.userID);
    } catch (e, stackTrace) {
      Toaster.error("Error", 'Failed to fetch user preview: ${e.toString()}');
      ApplicationLog.error('Failed to fetch user (preview) for ${widget.value.userID}', trace: stackTrace);
      return null;
    }

    KeyTokenPreview? key = null;
    if (widget.value.userKey != null) {
      try {
        key = await APIClient.getKeyTokenPreviewByToken(auth, widget.value.userKey!);
      } catch (e, stackTrace) {
        Toaster.error("Error", 'Failed to fetch keytoken preview: ${e.toString()}');
        ApplicationLog.error('Failed to fetch keytoken (preview) for ${widget.value.userID}', trace: stackTrace);
        return null;
      }
    }

    return (user, key);
  }

  @override
  Widget build(BuildContext context) {
    return FutureBuilder<(UserPreview, KeyTokenPreview?)?>(
      future: _fetchDataFuture,
      builder: (context, snapshot) {
        if (snapshot.connectionState == ConnectionState.waiting) {
          return const Center(child: CircularProgressIndicator());
        }

        if (snapshot.hasError) {
          return Text('Error: ${snapshot.error}'); //TODO better error display
        }

        if (snapshot.data == null) {
          return Column(
            spacing: 32,
            children: [
              Icon(FontAwesomeIcons.solidTriangleExclamation, size: 64, color: Colors.red[900]),
              Text("Failed to parse QR", textAlign: TextAlign.center),
            ],
          );
        }

        final (user, key) = snapshot.data!;

        return Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            Text((widget.value.userKey == null) ? "SCN User" : "SCN User & Key", style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 20), textAlign: TextAlign.center),
            const SizedBox(height: 16),
            if (user.username != null)
              Row(
                children: [
                  ConstrainedBox(child: Text("Name: ", style: const TextStyle(fontWeight: FontWeight.bold)), constraints: const BoxConstraints(minWidth: 100)),
                  Expanded(child: SingleChildScrollView(child: Text(user.username!), scrollDirection: Axis.horizontal)),
                ],
              ),
            Row(
              children: [
                ConstrainedBox(child: Text("UserID:", style: const TextStyle(fontWeight: FontWeight.bold)), constraints: const BoxConstraints(minWidth: 100)),
                Expanded(child: SingleChildScrollView(child: Text(user.userID, style: const TextStyle(fontStyle: FontStyle.italic)), scrollDirection: Axis.horizontal)),
              ],
            ),
            const SizedBox(height: 16),
            if (key != null) ...[
              Row(
                children: [
                  ConstrainedBox(child: Text("KeyID:", style: const TextStyle(fontWeight: FontWeight.bold)), constraints: const BoxConstraints(minWidth: 100)),
                  Expanded(child: SingleChildScrollView(child: Text(key.keytokenID, style: const TextStyle(fontStyle: FontStyle.italic)), scrollDirection: Axis.horizontal)),
                ],
              ),
              Row(
                children: [
                  ConstrainedBox(child: Text("KeyName:", style: const TextStyle(fontWeight: FontWeight.bold)), constraints: const BoxConstraints(minWidth: 100)),
                  Expanded(child: SingleChildScrollView(child: Text(key.name), scrollDirection: Axis.horizontal)),
                ],
              ),
              Row(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  ConstrainedBox(child: Text("Permissions:", style: const TextStyle(fontWeight: FontWeight.bold)), constraints: const BoxConstraints(minWidth: 100)),
                  Expanded(
                    child: SingleChildScrollView(
                      child: Text(_formatPermissions(key.permissions) + "\n" + (key.allChannels ? "(all channels)" : '(${key.channels.length} channels)')),
                      scrollDirection: Axis.horizontal,
                    ),
                  ),
                ],
              ),
            ],
            const SizedBox(height: 16),
            if (widget.value.userKey == null)
              Text(
                'QR Code contains no key\nCannot send messages',
                textAlign: TextAlign.center,
                style: const TextStyle(fontStyle: FontStyle.italic),
              ),
            if (widget.value.userKey != null) ..._buildSend(context),
          ],
        );
      },
    );
  }

  List<Widget> _buildSend(BuildContext context) {
    return [
      FractionallySizedBox(
        widthFactor: 1.0,
        child: TextField(
          controller: _ctrlMessage,
          decoration: const InputDecoration(
            border: OutlineInputBorder(),
            labelText: 'Text',
          ),
        ),
      ),
      const SizedBox(height: 4),
      Row(
        children: [
          Expanded(
            child: UI.button(
              text: 'Send Message',
              onPressed: _onSend,
              color: Theme.of(context).colorScheme.primary,
              textColor: Theme.of(context).colorScheme.onPrimary,
            ),
          ),
          const SizedBox(width: 8),
          UI.buttonIconOnly(
            icon: FontAwesomeIcons.earthAmericas,
            onPressed: _onOpenWeb,
            square: true,
            color: Theme.of(context).colorScheme.secondary,
            iconColor: Theme.of(context).colorScheme.onSecondary,
          ),
        ],
      ),
    ];
  }

  void _onSend() async {
    if (_ctrlMessage.text.isEmpty) {
      Toaster.error("Error", 'Please enter a message');
      return;
    }

    if (widget.value.userKey == null) return;

    try {
      await APIClient.sendMessage(widget.value.userID, widget.value.userKey!, _ctrlMessage.text);
      Toaster.success("Success", 'Message sent');
      setState(() {
        _ctrlMessage.clear();
      });
    } catch (e, stackTrace) {
      Toaster.error("Error", 'Failed to send message: ${e.toString()}');
      ApplicationLog.error('Failed to send message', trace: stackTrace);
    }
  }

  void _onOpenWeb() async {
    try {
      final Uri uri = Uri.parse(widget.value.url);

      ApplicationLog.debug('Opening URL: [ ${uri.toString()} ]');

      if (await canLaunchUrl(uri)) {
        await launchUrl(uri);
      } else {
        Toaster.error("Error", 'Cannot open URL on this system');
      }
    } catch (exc, trace) {
      ApplicationLog.error('Failed to open URL: ' + exc.toString(), additional: 'URL: ${widget.value.url}', trace: trace);
    }
  }

  String _formatPermissions(String v) {
    var splt = v.split(';');

    if (splt.length == 0) return "None";

    List<String> result = [];

    if (splt.contains("A")) result.add(" - Admin");
    if (splt.contains("UR")) result.add(" - Read Account");
    if (splt.contains("CR")) result.add(" - Read Messages");
    if (splt.contains("CS")) result.add(" - Send Messages");

    return result.join("\n");
  }
}