import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';
import 'package:intl/intl.dart';
import 'package:provider/provider.dart';
import 'package:share_plus/share_plus.dart';
import 'package:simplecloudnotifier/api/api_client.dart';
import 'package:simplecloudnotifier/components/layout/scaffold.dart';
import 'package:simplecloudnotifier/models/channel.dart';
import 'package:simplecloudnotifier/models/keytoken.dart';
import 'package:simplecloudnotifier/models/message.dart';
import 'package:simplecloudnotifier/models/user.dart';
import 'package:simplecloudnotifier/state/app_auth.dart';
import 'package:simplecloudnotifier/state/app_bar_state.dart';
import 'package:simplecloudnotifier/utils/toaster.dart';
import 'package:simplecloudnotifier/utils/ui.dart';

class MessageViewPage extends StatefulWidget {
  const MessageViewPage({super.key, required this.message});

  final Message message; // Potentially trimmed

  @override
  State<MessageViewPage> createState() => _MessageViewPageState();
}

class _MessageViewPageState extends State<MessageViewPage> {
  late Future<(Message, ChannelPreview, KeyTokenPreview, UserPreview)>? mainFuture;
  (Message, ChannelPreview, KeyTokenPreview, UserPreview)? mainFutureSnapshot = null;
  static final _dateFormat = DateFormat('yyyy-MM-dd kk:mm');

  bool _monospaceMode = false;

  @override
  void initState() {
    mainFuture = fetchData();
    super.initState();
  }

  Future<(Message, ChannelPreview, KeyTokenPreview, UserPreview)> fetchData() async {
    try {
      await Future.delayed(const Duration(seconds: 0), () {}); // this is annoyingly important - otherwise we call setLoadingIndeterminate directly in initStat() and get an exception....

      AppBarState().setLoadingIndeterminate(true);

      final acc = Provider.of<AppAuth>(context, listen: false);

      final msg = await APIClient.getMessage(acc, widget.message.messageID);

      final fut_chn = APIClient.getChannelPreview(acc, msg.channelID);
      final fut_key = APIClient.getKeyTokenPreview(acc, msg.usedKeyID);
      final fut_usr = APIClient.getUserPreview(acc, msg.senderUserID);

      final chn = await fut_chn;
      final key = await fut_key;
      final usr = await fut_usr;

      //await Future.delayed(const Duration(seconds: 10), () {});

      final r = (msg, chn, key, usr);

      mainFutureSnapshot = r;

      return r;
    } finally {
      AppBarState().setLoadingIndeterminate(false);
    }
  }

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

  @override
  Widget build(BuildContext context) {
    return SCNScaffold(
      title: 'Message',
      showSearch: false,
      showShare: true,
      onShare: _share,
      child: FutureBuilder<(Message, ChannelPreview, KeyTokenPreview, UserPreview)>(
        future: mainFuture,
        builder: (context, snapshot) {
          if (snapshot.hasData) {
            final (msg, chn, tok, usr) = snapshot.data!;
            return _buildMessageView(context, msg, chn, tok, usr);
          } else if (snapshot.hasError) {
            return Center(child: Text('${snapshot.error}')); //TODO nice error page
          } else if (!widget.message.trimmed) {
            return _buildMessageView(context, widget.message, null, null, null);
          } else {
            return const Center(child: CircularProgressIndicator());
          }
        },
      ),
    );
  }

  void _share() async {
    var msg = widget.message;
    if (mainFutureSnapshot != null) {
      (msg, _, _, _) = mainFutureSnapshot!;
    }

    if (msg.content != null) {
      final result = await Share.share(msg.content!, subject: msg.title);

      if (result.status == ShareResultStatus.unavailable) {
        Toaster.error('Error', "Failed to open share dialog");
      }
    } else {
      final result = await Share.share(msg.title);

      if (result.status == ShareResultStatus.unavailable) {
        Toaster.error('Error', "Failed to open share dialog");
      }
    }
  }

  Widget _buildMessageView(BuildContext context, Message message, ChannelPreview? channel, KeyTokenPreview? token, UserPreview? user) {
    final userAccUserID = context.select<AppAuth, String?>((v) => v.userID);

    return SingleChildScrollView(
      child: Padding(
        padding: const EdgeInsets.fromLTRB(24, 16, 24, 16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            ..._buildMessageHeader(context, message, channel),
            SizedBox(height: 8),
            if (message.content != null) ..._buildMessageContent(context, message),
            SizedBox(height: 8),
            if (message.senderName != null) _buildMetaCard(context, FontAwesomeIcons.solidSignature, 'Sender', [message.senderName!], () => {/*TODO*/}),
            _buildMetaCard(context, FontAwesomeIcons.solidGearCode, 'KeyToken', [message.usedKeyID, if (token != null) token.name], () => {/*TODO*/}),
            _buildMetaCard(context, FontAwesomeIcons.solidIdCardClip, 'MessageID', [message.messageID, if (message.userMessageID != null) message.userMessageID!], null),
            _buildMetaCard(context, FontAwesomeIcons.solidSnake, 'Channel', [message.channelID, channel?.displayName ?? message.channelInternalName], () => {/*TODO*/}),
            _buildMetaCard(context, FontAwesomeIcons.solidTimer, 'Timestamp', [message.timestamp], null),
            _buildMetaCard(context, FontAwesomeIcons.solidUser, 'User', [if (user != null) user.userID, if (user?.username != null) user!.username!], () => {/*TODO*/}), //TODO
            if (message.senderUserID == userAccUserID) UI.button(text: "Delete Message", onPressed: () {/*TODO*/}, color: Colors.red[900]),
          ],
        ),
      ),
    );
  }

  String _resolveChannelName(ChannelPreview? channel, Message message) {
    return channel?.displayName ?? message.channelInternalName;
  }

  List<Widget> _buildMessageHeader(BuildContext context, Message message, ChannelPreview? channel) {
    return [
      Row(
        children: [
          UI.channelChip(
            context: context,
            text: _resolveChannelName(channel, message),
            margin: const EdgeInsets.fromLTRB(0, 0, 4, 0),
            fontSize: 16,
          ),
          Expanded(child: SizedBox()),
          Text(_dateFormat.format(DateTime.parse(message.timestamp)), style: const TextStyle(fontSize: 14)),
        ],
      ),
      SizedBox(height: 8),
      Text(_preformatTitle(message), style: const TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
    ];
  }

  List<Widget> _buildMessageContent(BuildContext context, Message message) {
    return [
      Row(
        children: [
          if (message.priority == 2) FaIcon(FontAwesomeIcons.solidTriangleExclamation, size: 16, color: Colors.red[900]),
          if (message.priority == 0) FaIcon(FontAwesomeIcons.solidDown, size: 16, color: Colors.lightBlue[900]),
          Expanded(child: SizedBox()),
          UI.buttonIconOnly(
            onPressed: () {
              Clipboard.setData(new ClipboardData(text: message.content ?? ''));
              Toaster.info("Clipboard", 'Copied text to Clipboard');
            },
            icon: FontAwesomeIcons.copy,
          ),
          UI.buttonIconOnly(
            icon: _monospaceMode ? FontAwesomeIcons.lineColumns : FontAwesomeIcons.alignLeft,
            onPressed: () {
              setState(() {
                _monospaceMode = !_monospaceMode;
              });
            },
          ),
        ],
      ),
      _monospaceMode
          ? UI.box(
              context: context,
              padding: const EdgeInsets.all(4),
              child: SingleChildScrollView(
                scrollDirection: Axis.horizontal,
                child: Text(
                  message.content ?? '',
                  style: TextStyle(fontFamily: "monospace", fontFamilyFallback: <String>["Courier"]),
                ),
              ),
              borderColor: (message.priority == 2) ? Colors.red[900] : null,
            )
          : UI.box(
              context: context,
              padding: const EdgeInsets.all(4),
              child: Text(message.content ?? ''),
              borderColor: (message.priority == 2) ? Colors.red[900] : null,
            )
    ];
  }

  Widget _buildMetaCard(BuildContext context, IconData icn, String title, List<String> values, void Function()? action) {
    final container = UI.box(
      context: context,
      padding: EdgeInsets.fromLTRB(16, 2, 4, 2),
      child: Row(
        children: [
          FaIcon(icn, size: 18),
          SizedBox(width: 16),
          Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(title, style: const TextStyle(fontSize: 16, fontWeight: FontWeight.bold)),
              for (final val in values) Text(val, style: const TextStyle(fontSize: 14)),
            ],
          ),
        ],
      ),
    );

    if (action == null) {
      return Padding(
        padding: EdgeInsets.symmetric(vertical: 4, horizontal: 0),
        child: container,
      );
    } else {
      return Padding(
        padding: EdgeInsets.symmetric(vertical: 4, horizontal: 0),
        child: InkWell(
          splashColor: Theme.of(context).splashColor,
          onTap: action,
          child: container,
        ),
      );
    }
  }

  String _preformatTitle(Message message) {
    return message.title.replaceAll('\n', '').replaceAll('\r', '').replaceAll('\t', ' ');
  }
}