import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:veilid/veilid.dart';
import 'package:loggy/loggy.dart';
import 'package:veilid_example/veilid_theme.dart';

import 'log_terminal.dart';
import 'config.dart';
import 'log.dart';
import 'history_wrapper.dart';

// Main App
class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> with UiLoggy {
  String _veilidVersion = 'Unknown';
  bool _startedUp = false;
  Stream<VeilidUpdate>? _updateStream;
  Future<void>? _updateProcessor;
  final _debugHistoryWrapper = HistoryWrapper();
  String? _errorText;

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

    initPlatformState();
  }

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlatformState() async {
    String veilidVersion;
    // Platform messages may fail, so we use a try/catch PlatformException.
    // We also handle the message potentially returning null.
    try {
      veilidVersion = Veilid.instance.veilidVersionString();
    } on Exception {
      veilidVersion = 'Failed to get veilid version.';
    }

    // In case of hot restart shut down first
    try {
      await Veilid.instance.shutdownVeilidCore();
    } on Exception {
      //
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _veilidVersion = veilidVersion;
    });
  }

  Future<void> processLog(VeilidLog log) async {
    StackTrace? stackTrace;
    Object? error;
    final backtrace = log.backtrace;
    if (backtrace != null) {
      stackTrace =
          StackTrace.fromString("$backtrace\n${StackTrace.current.toString()}");
      error = 'embedded stack trace for ${log.logLevel} ${log.message}';
    }

    switch (log.logLevel) {
      case VeilidLogLevel.error:
        loggy.error(log.message, error, stackTrace);
        break;
      case VeilidLogLevel.warn:
        loggy.warning(log.message, error, stackTrace);
        break;
      case VeilidLogLevel.info:
        loggy.info(log.message, error, stackTrace);
        break;
      case VeilidLogLevel.debug:
        loggy.debug(log.message, error, stackTrace);
        break;
      case VeilidLogLevel.trace:
        loggy.trace(log.message, error, stackTrace);
        break;
    }
  }

  Future<void> processUpdates() async {
    var stream = _updateStream;
    if (stream != null) {
      await for (final update in stream) {
        if (update is VeilidLog) {
          await processLog(update);
        } else if (update is VeilidAppMessage) {
          loggy.info("AppMessage: ${update.json}");
        } else if (update is VeilidAppCall) {
          loggy.info("AppCall: ${update.json}");
        } else {
          loggy.trace("Update: ${update.json}");
        }
      }
    }
  }

  Future<void> toggleStartup(bool startup) async {
    if (startup && !_startedUp) {
      var updateStream = await Veilid.instance
          .startupVeilidCore(await getDefaultVeilidConfig());
      setState(() {
        _updateStream = updateStream;
        _updateProcessor = processUpdates();
        _startedUp = true;
      });
      await Veilid.instance.attach();
    } else if (!startup && _startedUp) {
      await Veilid.instance.shutdownVeilidCore();
      if (_updateProcessor != null) {
        await _updateProcessor;
      }
      setState(() {
        _updateProcessor = null;
        _updateStream = null;
        _startedUp = false;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text('Veilid Plugin Version $_veilidVersion'),
        ),
        body: Column(children: [
          const Expanded(child: LogTerminal()),
          Container(
            decoration: BoxDecoration(
                color: materialBackgroundColor.shade100,
                boxShadow: [
                  BoxShadow(
                    color: Colors.black.withOpacity(0.15),
                    spreadRadius: 4,
                    blurRadius: 4,
                  )
                ]),
            padding: const EdgeInsets.all(5.0),
            child: Row(children: [
              Expanded(
                  child: pad(_debugHistoryWrapper.wrap(
                setState,
                TextField(
                    controller: _debugHistoryWrapper.controller,
                    decoration: newInputDecoration(
                        'Debug Command', _errorText, _startedUp),
                    textInputAction: TextInputAction.unspecified,
                    enabled: _startedUp,
                    onChanged: (v) {
                      setState(() {
                        _errorText = null;
                      });
                    },
                    onSubmitted: (String v) async {
                      try {
                        var res = await Veilid.instance.debug(v);
                        loggy.info(res);
                        setState(() {
                          _debugHistoryWrapper.submit(v);
                        });
                      } on VeilidAPIException catch (e) {
                        setState(() {
                          _errorText = e.toDisplayError();
                        });
                      }
                    }),
              ))),
              pad(
                Column(children: [
                  const Text('Startup'),
                  Switch(
                      value: _startedUp,
                      onChanged: (bool value) async {
                        await toggleStartup(value);
                      }),
                ]),
              ),
              pad(Column(children: [
                const Text('Log Level'),
                DropdownButton<LogLevel>(
                    value: loggy.level.logLevel,
                    onChanged: (LogLevel? newLevel) {
                      setState(() {
                        setRootLogLevel(newLevel);
                      });
                    },
                    items: const [
                      DropdownMenuItem<LogLevel>(
                          value: LogLevel.error, child: Text("Error")),
                      DropdownMenuItem<LogLevel>(
                          value: LogLevel.warning, child: Text("Warning")),
                      DropdownMenuItem<LogLevel>(
                          value: LogLevel.info, child: Text("Info")),
                      DropdownMenuItem<LogLevel>(
                          value: LogLevel.debug, child: Text("Debug")),
                      DropdownMenuItem<LogLevel>(
                          value: traceLevel, child: Text("Trace")),
                      DropdownMenuItem<LogLevel>(
                          value: LogLevel.all, child: Text("All")),
                    ]),
              ])),
            ]),
          ),
        ]));
  }
}