import 'dart:async';

import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:logger/logger.dart';

import '../domain/models.dart';
import '../services/mining_service.dart';
import 'wallet_controller.dart';

class MiningState {
  const MiningState({
    required this.running,
    required this.busy,
    required this.summary,
    required this.error,
  });

  final bool running;
  final bool busy;
  final XmrigSummary? summary;
  final String? error;

  MiningState copyWith({
    bool? running,
    bool? busy,
    XmrigSummary? summary,
    String? error,
  }) {
    return MiningState(
      running: running ?? this.running,
      busy: busy ?? this.busy,
      summary: summary ?? this.summary,
      error: error,
    );
  }

  factory MiningState.initial() {
    return const MiningState(
      running: false,
      busy: false,
      summary: null,
      error: null,
    );
  }
}

class MiningController extends StateNotifier<MiningState> {
  MiningController({
    required MiningService service,
    required Logger logger,
    required AppConfig Function() readConfig,
    required WalletState Function() readWalletState,
  })  : _service = service,
        _logger = logger,
        _readConfig = readConfig,
        _readWalletState = readWalletState,
        super(MiningState.initial()) {
    _timer = Timer.periodic(const Duration(seconds: 2), (_) => refresh());
    unawaited(refresh());
  }

  final MiningService _service;
  final Logger _logger;
  final AppConfig Function() _readConfig;
  final WalletState Function() _readWalletState;
  Timer? _timer;

  Future<bool> start() async {
    return _runAction(() async {
      final config = _buildLaunchConfig();
      final started = await _service.start(config: config);
      await refresh();
      final confirmed = await _confirmRunning(config);
      if (!started && !confirmed) {
        throw StateError('Failed to start miner');
      }
      return true;
    });
  }

  Future<bool> stop() async {
    return _runAction(() async {
      final config = _tryBuildLaunchConfig();
      final stopped = await _service.stop(config: config);
      if (!stopped) {
        throw StateError('Failed to stop miner');
      }
      await refresh();
      return true;
    });
  }

  Future<bool> restart() async {
    return _runAction(() async {
      final config = _buildLaunchConfig();
      final restarted = await _service.restart(config: config);
      await refresh();
      final confirmed = await _confirmRunning(config);
      if (!restarted && !confirmed) {
        throw StateError('Failed to restart miner');
      }
      return true;
    });
  }

  Future<void> refresh() async {
    final config = _tryBuildLaunchConfig();
    if (config == null) {
      state = state.copyWith(
        running: false,
        summary: null,
        error: state.busy ? state.error : null,
      );
      return;
    }
    try {
      final running = await _service.isRunning(config: config);
      final summary = running ? await _service.fetchSummary(config: config) : null;
      state = state.copyWith(
        running: running,
        summary: summary,
        error: null,
      );
    } catch (error, stack) {
      _logger.w('Failed to refresh miner state', error: error, stackTrace: stack);
      state = state.copyWith(error: error.toString());
    }
  }

  Future<bool> _runAction(Future<bool> Function() action) async {
    if (state.busy) {
      return false;
    }
    state = state.copyWith(busy: true, error: null);
    try {
      return await action();
    } catch (error, stack) {
      _logger.w('Mining action failed', error: error, stackTrace: stack);
      state = state.copyWith(error: error.toString());
      return false;
    } finally {
      state = state.copyWith(busy: false);
    }
  }

  Future<bool> _confirmRunning(MinerLaunchConfig config) async {
    for (var i = 0; i < 6; i++) {
      final running = await _service.isRunning(config: config);
      if (running) {
        final summary = await _service.fetchSummary(config: config);
        state = state.copyWith(running: true, summary: summary, error: null);
        return true;
      }
      await Future.delayed(const Duration(milliseconds: 500));
    }
    return false;
  }

  MinerLaunchConfig? _tryBuildLaunchConfig() {
    try {
      return _buildLaunchConfig();
    } catch (_) {
      return null;
    }
  }

  MinerLaunchConfig _buildLaunchConfig() {
    final config = _readConfig();
    final wallet = _readWalletState().walletInfo;
    final address = wallet?.address.trim() ?? '';
    if (address.isEmpty) {
      throw StateError('Open a wallet before starting the miner');
    }

    final mining = config.miningConfig;
    final localNode = _resolveLocalNodePorts(config.localNodeArgs);
    final mode =
        mining.mode == MiningMode.solo ? MinerTargetMode.solo : MinerTargetMode.pool;

    if (mode == MinerTargetMode.solo && config.nodeConfig.mode != NodeMode.local) {
      throw StateError('Solo mining requires the wallet to use the local node');
    }

    return MinerLaunchConfig(
      mode: mode,
      walletAddress: address,
      cpuThreads: mining.cpuThreads.clamp(1, 64),
      apiPort: mining.apiPort,
      poolHost: mining.poolHost,
      poolPort: mining.poolPort,
      daemonHost: localNode.host,
      daemonPort: localNode.rpcPort,
      daemonZmqPort: localNode.zmqPort,
    );
  }

  ({String host, int rpcPort, int zmqPort}) _resolveLocalNodePorts(
    List<String> args,
  ) {
    var host = '127.0.0.1';
    var rpcPort = 17750;
    var zmqPort = 17751;
    for (var i = 0; i < args.length; i++) {
      final arg = args[i];
      if (arg.startsWith('--rpc-bind-ip=')) {
        host = arg.split('=').last.trim();
      } else if (arg == '--rpc-bind-ip' && i + 1 < args.length) {
        host = args[i + 1].trim();
      } else if (arg.startsWith('--rpc-bind-port=')) {
        rpcPort = int.tryParse(arg.split('=').last.trim()) ?? rpcPort;
      } else if (arg == '--rpc-bind-port' && i + 1 < args.length) {
        rpcPort = int.tryParse(args[i + 1].trim()) ?? rpcPort;
      } else if (arg.startsWith('--zmq-rpc-bind-port=')) {
        zmqPort = int.tryParse(arg.split('=').last.trim()) ?? zmqPort;
      } else if (arg == '--zmq-rpc-bind-port' && i + 1 < args.length) {
        zmqPort = int.tryParse(args[i + 1].trim()) ?? zmqPort;
      }
    }

    if (host == '0.0.0.0' || host == '::' || host == '[::]') {
      host = '127.0.0.1';
    }
    return (host: host, rpcPort: rpcPort, zmqPort: zmqPort);
  }

  @override
  void dispose() {
    _timer?.cancel();
    super.dispose();
  }
}