part of 'command_executor.dart';

extension _CommandExecutorSupport on CommandExecutor {
  void _appendCompletionEffect(
    List<Effect> effects,
    RuntimeCommand command,
    String target,
    int targetEpoch,
    RuntimeTask<_CommandResult> task,
    String? scope,
    int? scopeEpoch,
  ) {
    effects.add(
      FunctionEffect((_, __) {
        if (!_scopeIsAlive(scope) ||
            !_renderTree.isNodeEpochAlive(target, targetEpoch)) {
          task.cancel();
          return;
        }
        _emitCompletion(command, target, scope, targetEpoch, scopeEpoch);
        task.complete(_CommandResult.completed);
      }, EffectController(duration: 0.01)),
    );
  }

  void _emitCompletion(
    RuntimeCommand command,
    String target,
    String? scope, [
    int? targetEpoch,
    int? scopeEpoch,
  ]) {
    final onComplete = _optionalString(
      command.payload['onComplete'],
      'onComplete',
    );
    if (onComplete == null) {
      return;
    }
    _emitEventIfScopeAlive(
      RuntimeEvent(
        type: RuntimeEventType.animationDone,
        target: target,
        handler: onComplete,
      ),
      scope,
      targetEpoch: targetEpoch,
      scopeEpoch: scopeEpoch,
    );
  }

  void _emitCommandCompletion(RuntimeCommand command, _CommandContext context) {
    final onComplete = _optionalString(
      command.payload['onComplete'],
      'onComplete',
    );
    if (onComplete == null) {
      return;
    }
    _emitEventIfScopeAlive(
      RuntimeEvent(
        type: RuntimeEventType.animationDone,
        target: command.target,
        handler: onComplete,
      ),
      _completionScopeFor(command, context),
      scopeEpoch: context.scopeEpoch,
    );
  }

  void _emitEventIfScopeAlive(
    RuntimeEvent event,
    String? scope, {
    int? targetEpoch,
    int? scopeEpoch,
  }) {
    if (!_scopeIsAlive(scope) || _disposed) {
      return;
    }
    _eventSink(
      event.withLifecycle(
        scope: scope,
        targetEpoch: targetEpoch,
        scopeEpoch: scopeEpoch,
      ),
    );
  }

  Vector2 _requiredVector(RuntimeCommand command) {
    final x = _readDouble(command.payload['x']);
    final y = _readDouble(command.payload['y']);
    if (x == null || y == null) {
      throw FormatException('${command.type}.x/y are required numbers');
    }
    return Vector2(x, y);
  }

  String _requiredTarget(RuntimeCommand command) {
    final target = command.target;
    if (target == null || target.isEmpty) {
      throw FormatException('${command.type}.target is required');
    }
    return target;
  }

  String _requiredText(RuntimeCommand command, String field) {
    return _optionalString(command.payload['text'], field)!;
  }

  double _duration(RuntimeCommand command, {required double defaultValue}) {
    final duration = _readDouble(command.payload['duration']) ?? defaultValue;
    if (duration < 0) {
      throw FormatException('${command.type}.duration must be >= 0');
    }
    return duration;
  }

  double _requiredDouble(Object? value, String field) {
    final result = _readDouble(value);
    if (result == null) {
      throw FormatException('$field must be a number');
    }
    return result;
  }

  void _registerBgmChannel({required String channel, required String? scope}) {
    _unregisterBgmChannel(channel);
    _ownedBgmChannels.add(channel);
    if (scope == null) {
      return;
    }
    _bgmScopeByChannel[channel] = scope;
    _bgmChannelsByScope.putIfAbsent(scope, () => {}).add(channel);
  }

  void _unregisterBgmChannel(String channel) {
    _ownedBgmChannels.remove(channel);
    final oldScope = _bgmScopeByChannel.remove(channel);
    if (oldScope == null) {
      return;
    }
    final channels = _bgmChannelsByScope[oldScope];
    channels?.remove(channel);
    if (channels != null && channels.isEmpty) {
      _bgmChannelsByScope.remove(oldScope);
    }
  }

  String _audioChannel(RuntimeCommand command) {
    return _optionalString(command.payload['channel'], 'channel') ??
        RuntimeAudioChannel.defaultBgm;
  }

  String _requiredResourceGroup(RuntimeCommand command) {
    return _optionalString(command.payload['group'], '${command.type}.group')!;
  }

  void _validateCancelCommands(RuntimeCommand command) {
    final id = _optionalString(command.payload['id'], 'cancel_commands.id');
    final group = _optionalString(
      command.payload['group'],
      'cancel_commands.group',
    );
    final scope = _optionalString(
      command.payload['scope'],
      'cancel_commands.scope',
    );
    if (id == null && group == null && scope == null) {
      throw const FormatException(
        'cancel_commands requires id, group or scope',
      );
    }
  }

  String _requiredAudioResource(RuntimeCommand command) {
    final asset = command.payload['asset'] ?? command.payload['name'];
    return _optionalString(asset, 'play_sound.asset/name')!;
  }

  String _requiredSpineAnimation(RuntimeCommand command) {
    final value = _optionalString(
      command.payload['animation'],
      'play_spine_animation.animation',
    );
    if (value == null) {
      throw const FormatException(
        'play_spine_animation.animation must be a non-empty string',
      );
    }
    return value;
  }

  bool? _optionalBool(Object? value, String field) {
    if (value == null) {
      return null;
    }
    if (value is bool) {
      return value;
    }
    throw FormatException('$field must be a boolean');
  }

  double _optionalVolume(RuntimeCommand command) {
    final value = command.payload['volume'];
    if (value == null) {
      return 1;
    }
    return _requiredNormalizedDouble(value, 'play_sound.volume');
  }

  double _requiredNormalizedDouble(Object? value, String field) {
    final result = _requiredDouble(value, field);
    if (result < 0 || result > 1) {
      throw FormatException('$field must be between 0 and 1');
    }
    return result;
  }

  String? _optionalString(Object? value, String field) {
    if (value == null) {
      return null;
    }
    if (value is String && value.isNotEmpty) {
      return value;
    }
    throw FormatException('$field must be a non-empty string');
  }

  int? _optionalInt(Object? value, String field) {
    if (value == null) {
      return null;
    }
    if (value is num) {
      return value.toInt();
    }
    throw FormatException('$field must be an integer');
  }

  double? _readDouble(Object? value) {
    if (value == null) {
      return null;
    }
    if (value is num) {
      return value.toDouble();
    }
    return null;
  }
}