Extract import sync preview service

services/api-server/src/api_server/main.py

@@ -96,6 +96,8 @@ from api_server.html5_setup_controller import (
 )
 from api_server.import_quality_models import ImportQualityResponse
 from api_server.import_quality_service import import_quality_response as _build_import_quality_response
+from api_server.import_sync_models import ImportSyncPreview
+from api_server.import_sync_service import build_import_sync_preview as _build_import_sync_preview
 from api_server.metadata_tree_controller import (
     metadata_tree as _metadata_tree,
     metadata_tree_children as _metadata_tree_children,
@@ -923,28 +925,6 @@ class ImportRequest(BaseModel):
     mode: ImportMode = ImportMode.FULL_REPLACE
 
 
-class ImportSyncDiffItem(BaseModel):
-    qualified_name: str
-    name: str
-    object_kind: str
-    group_name: str | None = None
-    change_kind: str
-    before_hash: str | None = None
-    after_hash: str | None = None
-
-
-class ImportSyncPreview(BaseModel):
-    mode: ImportMode = ImportMode.SYNC_PREVIEW
-    applied: bool = False
-    status: str = "preview_only"
-    message: str
-    added_count: int = 0
-    removed_count: int = 0
-    changed_count: int = 0
-    unchanged_count: int = 0
-    items: list[ImportSyncDiffItem] = Field(default_factory=list)
-
-
 class ImportSummary(BaseModel):
     source: ImportSourceKind
     mode: ImportMode = ImportMode.FULL_REPLACE
@@ -7249,72 +7229,6 @@ def _import_project_sync_preview(project_id: str, request: ImportRequest) -> Imp
     return summary
 
 
-def _build_import_sync_preview(
-    current: NormalizedProject | None,
-    incoming: NormalizedProject | None,
-) -> ImportSyncPreview:
-    current_index = _normalized_object_hash_index(current)
-    incoming_index = _normalized_object_hash_index(incoming)
-    items: list[ImportSyncDiffItem] = []
-
-    for qualified_name in sorted(set(current_index) | set(incoming_index)):
-        before = current_index.get(qualified_name)
-        after = incoming_index.get(qualified_name)
-        if before is None and after is not None:
-            change_kind = "ADD"
-        elif before is not None and after is None:
-            change_kind = "REMOVE"
-        elif before is not None and after is not None and before["hash"] != after["hash"]:
-            change_kind = "UPDATE"
-        else:
-            change_kind = "UNCHANGED"
-
-        source = after or before or {}
-        items.append(
-            ImportSyncDiffItem(
-                qualified_name=qualified_name,
-                name=str(source.get("name", qualified_name)),
-                object_kind=str(source.get("object_kind", "UNKNOWN")),
-                group_name=source.get("group_name"),
-                change_kind=change_kind,
-                before_hash=before["hash"] if before is not None else None,
-                after_hash=after["hash"] if after is not None else None,
-            )
-        )
-
-    added_count = sum(1 for item in items if item.change_kind == "ADD")
-    removed_count = sum(1 for item in items if item.change_kind == "REMOVE")
-    changed_count = sum(1 for item in items if item.change_kind == "UPDATE")
-    unchanged_count = sum(1 for item in items if item.change_kind == "UNCHANGED")
-    return ImportSyncPreview(
-        message=(
-            "Synchronization is not applied yet. This preview shows what would change; "
-            "use FULL_REPLACE to replace current project data."
-        ),
-        added_count=added_count,
-        removed_count=removed_count,
-        changed_count=changed_count,
-        unchanged_count=unchanged_count,
-        items=[item for item in items if item.change_kind != "UNCHANGED"],
-    )
-
-
-def _normalized_object_hash_index(normalized: NormalizedProject | None) -> dict[str, dict]:
-    if normalized is None:
-        return {}
-    result: dict[str, dict] = {}
-    for group in normalized.configuration.groups:
-        for item in group.objects:
-            payload = item.model_dump(mode="json")
-            result[item.qualified_name] = {
-                "name": item.name,
-                "object_kind": item.object_kind,
-                "group_name": group.name,
-                "hash": stable_hash(json.dumps(payload, ensure_ascii=False, sort_keys=True)),
-            }
-    return result
-
-
 def _append_import_history(project_id: str, summary: ImportSummary) -> None:
     state = _project_setup.setdefault(project_id, {})
     history = list(state.get("import_history", []))