processServerEvent function

Implementation

WorldState? processServerEvent(
  ServerWorldEvent event,
  WorldState state, {
  required Map<String, FileMetadata> signature,
}) {
  if (!isValidServerEvent(event, state)) return null;
  switch (event) {
    case WorldInitialized():
      final supported = isServerSupported(signature, event.packsSignature);
      if (!supported) {
        throw InvalidPacksError(signature: event.packsSignature);
      }
      return state.copyWith(
        table: event.table,
        id: event.id ?? state.id,
        teamMembers: event.teamMembers,
        info: event.info,
      );
    case TeamJoined():
      return state.copyWith(
        teamMembers: {
          ...state.teamMembers,
          event.team: {
            ...?state.teamMembers[event.team],
            event.user,
          },
        },
      );
    case TeamLeft():
      final members = Set<Channel>.from(state.teamMembers[event.team] ?? {});
      members.remove(event.user);
      final allMembers = Map<String, Set<int>>.from(state.teamMembers);
      if (members.isEmpty) {
        allMembers.remove(event.team);
      } else {
        allMembers[event.team] = members;
      }
      return state.copyWith(teamMembers: allMembers);
    case ObjectsChanged():
      return state.mapTableOrDefault(event.cell.table, (table) {
        final cell = table.cells[event.cell.position] ?? TableCell();
        final newCell = cell.copyWith(objects: event.objects);
        if (newCell.isEmpty) {
          return table.copyWith.cellsBox(
              content: Map<VectorDefinition, TableCell>.from(table.cells)
                ..remove(event.cell.position));
        }
        return table.copyWith.cellsBox(
            content: Map<VectorDefinition, TableCell>.from(table.cells)
              ..[event.cell.position] = newCell);
      });
    case CellShuffled(positions: final positions):
      return state.mapTableOrDefault(event.cell.table, (table) {
        final cell = table.cells[event.cell.position] ?? TableCell();
        final objects = cell.objects;
        final newObjects = List<GameObject>.from(objects);
        for (var i = 0; i < positions.length; i++) {
          newObjects[positions[i]] = objects[i];
        }
        return table.copyWith.cellsBox(
            content: Map<VectorDefinition, TableCell>.from(table.cells)
              ..[event.cell.position] = cell.copyWith(objects: newObjects));
      });
    case BackgroundChanged():
      return state.copyWith.table(background: event.background);
    case ObjectsSpawned():
      return state.mapTableOrDefault(event.table, (table) {
        var newTable = table;
        for (final entry in event.objects.entries) {
          final cell = newTable.cells[entry.key] ?? TableCell();
          newTable = newTable.copyWith.cellsBox(
              content: Map<VectorDefinition, TableCell>.from(newTable.cells)
                ..[entry.key] = cell.copyWith(objects: entry.value));
        }
        return newTable;
      });
    case ObjectsMoved():
      return state.mapTableOrDefault(event.table, (table) {
        var from = table.cells[event.from] ?? TableCell();
        var to = table.cells[event.to] ?? TableCell();
        final toRemove = List<int>.from(event.objects)
          ..sort((a, b) => b.compareTo(a));
        final toAdd = toRemove.map((e) => from.objects[e]).toList();
        final newObjects = List<GameObject>.from(from.objects);
        for (final i in toRemove) {
          newObjects.removeAt(i);
        }
        from = from.copyWith(objects: newObjects);
        to = to.copyWith(objects: [
          ...to.objects,
          ...toAdd,
        ]);
        final cells = Map<VectorDefinition, TableCell>.from(table.cells)
          ..[event.to] = to;
        if (from.isEmpty) {
          cells.remove(event.from);
        } else {
          cells[event.from] = from;
        }

        return table.copyWith.cellsBox(content: cells);
      });
    case CellHideChanged():
      return state.mapTableOrDefault(event.cell.table, (table) {
        final cell = table.cells[event.cell.position] ?? TableCell();
        final objectIndex = event.object;
        if (objectIndex != null) {
          final object = cell.objects[objectIndex];
          return table.copyWith.cellsBox(
              content: Map<VectorDefinition, TableCell>.from(table.cells)
                ..[event.cell.position] = cell.copyWith.objects.replace(
                    objectIndex,
                    object.copyWith(hidden: event.hide ?? !object.hidden)));
        }
        final hidden =
            !(event.hide ?? cell.objects.firstOrNull?.hidden ?? false);
        return table.copyWith.cellsBox(
            content: Map<VectorDefinition, TableCell>.from(table.cells)
              ..[event.cell.position] = cell.copyWith(
                  objects: cell.objects
                      .map((e) => e.copyWith(hidden: hidden))
                      .toList()));
      });
    case ObjectsRemoved():
      return state.mapTableOrDefault(event.cell.table, (table) {
        final cell = table.cells[event.cell.position] ?? TableCell();
        final objectIndex = event.objects;
        var newCell = cell;
        if (objectIndex != null) {
          final objects = List<GameObject>.from(cell.objects);
          final indexes = objectIndex.toList()..sort((a, b) => b.compareTo(a));
          for (final index in indexes) {
            objects.removeAt(index);
          }
          newCell = cell.copyWith();
        } else {
          newCell = cell.copyWith(objects: []);
        }
        if (newCell.isEmpty) {
          return table.copyWith.cellsBox(
              content: Map<VectorDefinition, TableCell>.from(table.cells)
                ..remove(event.cell.position));
        }
        return table.copyWith.cellsBox(
            content: Map<VectorDefinition, TableCell>.from(table.cells)
              ..[event.cell.position] = newCell);
      });
    case ObjectIndexChanged():
      return state.mapTableOrDefault(event.cell.table, (table) {
        final cell = table.cells[event.cell.position] ?? TableCell();
        final object = cell.objects[event.object];
        final newObjects = List<GameObject>.from(cell.objects);
        newObjects.removeAt(event.object);
        newObjects.insert(event.index, object);
        return table.copyWith.cellsBox(
            content: Map<VectorDefinition, TableCell>.from(table.cells)
              ..[event.cell.position] = cell.copyWith(objects: newObjects));
      });
    case TeamChanged():
      return state.copyWith.info.teams.put(event.name, event.team);
    case TeamRemoved():
      return state.copyWith(
        info: state.info.copyWith.teams.remove(event.team),
        teamMembers: Map.from(state.teamMembers)..remove(event.team),
      );
    case MetadataChanged():
      return state.copyWith(metadata: event.metadata);
    case MessageSent():
      return state.copyWith.messages.add(ChatMessage(
        author: event.user,
        content: event.message,
        timestamp: DateTime.now(),
      ));
    case TableRenamed():
      final data = state.data.getTable(event.name);
      return state.copyWith(
          tableName:
              event.name == state.tableName ? event.newName : state.tableName,
          data: data == null
              ? state.data
              : state.data
                  .removeTable(event.name)
                  .setTable(data, event.newName));
    case TableRemoved():
      return state.copyWith(
          tableName: state.tableName == event.name ? '' : state.tableName,
          data: state.data.removeTable(event.name));
    case NoteChanged():
      return state.copyWith(
          data: state.data.setNote(event.name, event.content));
    case NoteRemoved():
      return state.copyWith(data: state.data.removeNote(event.name));
    case BoardTilesSpawned():
      return state.mapTableOrDefault(event.table, (table) {
        final cells = Map<VectorDefinition, TableCell>.from(table.cells);
        for (final entry in event.tiles.entries) {
          cells[entry.key] =
              table.getCell(entry.key).copyWith.tiles.addAll(entry.value);
        }
        return table.copyWith.cellsBox(content: cells);
      });
    case BoardTilesChanged():
      return state.mapTableOrDefault(event.table, (table) {
        final cells = Map<VectorDefinition, TableCell>.from(table.cells);
        for (final entry in event.tiles.entries) {
          final newCell = table.getCell(entry.key).copyWith(tiles: entry.value);
          if (newCell.isEmpty) {
            cells.remove(entry.key);
          } else {
            cells[entry.key] = newCell;
          }
        }
        return table.copyWith.cellsBox(content: cells);
      });
    case DialogOpened():
      final index = state.dialogs.indexWhere((e) => e.id == event.dialog.id);
      if (index != -1) {
        return state.copyWith.dialogs.replace(index, event.dialog);
      }
      return state.copyWith.dialogs.add(event.dialog);
    case DialogsClosed():
      return state.copyWith.dialogs
          .where((e) => !(event.ids?.contains(e.id) ?? true));
  }
}