diff static method

Implementation

static NiceViewDiff diff(NiceViewDefinition from, NiceViewDefinition to) {
  final changes = <NiceViewChange>[];
  final fromMap = {for (final c in from.components) c.id: c};
  final toMap = {for (final c in to.components) c.id: c};

  // Check for removed components
  for (final id in fromMap.keys) {
    if (!toMap.containsKey(id)) {
      changes.add(NiceViewChange(
        type: NiceViewChangeType.removed,
        componentId: id,
      ));
    }
  }

  // Check for added components
  for (final id in toMap.keys) {
    if (!fromMap.containsKey(id)) {
      changes.add(NiceViewChange(
        type: NiceViewChangeType.added,
        componentId: id,
      ));
    }
  }

  // Check for modified components
  for (final id in fromMap.keys) {
    final fromComp = fromMap[id]!;
    final toComp = toMap[id];
    if (toComp == null) continue;

    if (fromComp.type != toComp.type) {
      changes.add(NiceViewChange(
        type: NiceViewChangeType.modified,
        componentId: id,
        field: 'type',
        oldValue: fromComp.type.name,
        newValue: toComp.type.name,
      ));
    }
    if (fromComp.title != toComp.title) {
      changes.add(NiceViewChange(
        type: NiceViewChangeType.modified,
        componentId: id,
        field: 'title',
        oldValue: fromComp.title,
        newValue: toComp.title,
      ));
    }
    if (fromComp.flex != toComp.flex) {
      changes.add(NiceViewChange(
        type: NiceViewChangeType.modified,
        componentId: id,
        field: 'flex',
        oldValue: fromComp.flex,
        newValue: toComp.flex,
      ));
    }
    if (jsonEncode(fromComp.config) != jsonEncode(toComp.config)) {
      changes.add(NiceViewChange(
        type: NiceViewChangeType.modified,
        componentId: id,
        field: 'config',
        oldValue: fromComp.config,
        newValue: toComp.config,
      ));
    }
  }

  // Check for reordering
  final fromIds = from.components.map((c) => c.id).toList();
  final toIds = to.components.map((c) => c.id).toList();
  final commonIds = fromIds.where(toIds.contains).toList();
  final commonInTo = toIds.where(commonIds.contains).toList();
  if (commonIds.join(',') != commonInTo.join(',')) {
    changes.add(NiceViewChange(
      type: NiceViewChangeType.reordered,
      componentId: '*',
      oldValue: fromIds,
      newValue: toIds,
    ));
  }

  // Layout change
  if (from.layout != to.layout) {
    changes.add(NiceViewChange(
      type: NiceViewChangeType.modified,
      componentId: '*',
      field: 'layout',
      oldValue: from.layout.name,
      newValue: to.layout.name,
    ));
  }

  return NiceViewDiff(
    fromVersion: from.version,
    toVersion: to.version,
    changes: changes,
  );
}