from __future__ import annotations from dataclasses import asdict from typing import Any from fastapi import HTTPException from app.domain.editor import VariantChange from app.domain.editor_builder import build_runtime_payload_from_changes from app.domain.mappers import to_release from app.repositories.directus.releases import ReleaseRepository from app.repositories.directus.variant_changes import VariantChangeRepository from app.repositories.directus.variants import VariantRepository from app.schemas.admin import BuildReleaseRequest, ReleaseLifecycleResponse, ReleaseRead, release_to_read_model class ReleaseService: """Application service for release and snapshot lifecycle.""" def __init__( self, repository: ReleaseRepository | None = None, variant_repository: VariantRepository | None = None, change_repository: VariantChangeRepository | None = None, ) -> None: self.repository = repository or ReleaseRepository() self.variant_repository = variant_repository or VariantRepository() self.change_repository = change_repository or VariantChangeRepository() async def _enforce_single_published( self, experiment_id: str, keep_release_id: str, access_token: str | None = None, ) -> None: published_items = await self.repository.list( params={ "filter[experiment_id][_eq]": experiment_id, "filter[status][_eq]": "published", }, access_token=access_token, ) for item in published_items: item_id = str(item["id"]) if item_id != keep_release_id: await self.repository.update(item_id, {"status": "draft"}, access_token=access_token) async def list_releases( self, experiment_id: str | None = None, access_token: str | None = None, ) -> list[ReleaseRead]: params: dict[str, Any] | None = None if experiment_id: params = {"filter[experiment_id][_eq]": experiment_id} items = await self.repository.list(params=params, access_token=access_token) return [release_to_read_model(to_release(item)) for item in items] async def get_release( self, release_id: str, access_token: str | None = None, ) -> ReleaseRead | None: item = await self.repository.get(release_id, access_token=access_token) if not item: return None return release_to_read_model(to_release(item)) async def build_release( self, payload: BuildReleaseRequest, access_token: str | None = None, ) -> ReleaseRead: experiment_id = payload.experiment_id # Fetch all variants for the experiment variant_items = await self.variant_repository.list( params={"filter[experiment_id][_eq]": experiment_id}, access_token=access_token, ) # Build per-variant runtime payloads variants_payload: list[dict[str, Any]] = [] for variant_item in variant_items: variant_id = str(variant_item["id"]) change_items = await self.change_repository.list( params={"filter[variant_id][_eq]": variant_id}, access_token=access_token, ) changes = [ VariantChange( id=str(c["id"]), variant_id=variant_id, change_type=str(c.get("change_type", "")), selector_type=str(c.get("selector_type", "")), selector_value=str(c.get("selector_value", "")), sort_order=int(c.get("sort_order", 0)), payload=c.get("payload"), ) for c in change_items ] runtime_payload = build_runtime_payload_from_changes(variant_id, changes) variants_payload.append({ "variant_id": variant_id, "variant_key": str(variant_item.get("variant_key", "")), "traffic_weight": int(variant_item.get("traffic_weight", 0)), "operations": [asdict(op) for op in runtime_payload.operations], }) # Determine next version_no existing = await self.repository.list( params={"filter[experiment_id][_eq]": experiment_id, "sort": "-version_no", "limit": "1"}, access_token=access_token, ) next_version = (int(existing[0]["version_no"]) + 1) if existing else 1 new_release = await self.repository.create( { "experiment_id": experiment_id, "version_no": next_version, "status": "draft", "runtime_payload": {"variants": variants_payload}, }, access_token=access_token, ) return release_to_read_model(to_release(new_release)) async def publish_release( self, release_id: str, access_token: str | None = None, ) -> ReleaseLifecycleResponse | None: # Fetch the target release to get experiment_id target = await self.repository.get(release_id, access_token=access_token) if not target: return None experiment_id = str(target["experiment_id"]) item = await self.repository.update(release_id, {"status": "published"}, access_token=access_token) if not item: return None await self._enforce_single_published( experiment_id=experiment_id, keep_release_id=release_id, access_token=access_token, ) return ReleaseLifecycleResponse( id=str(item["id"]), status=str(item["status"]), version_no=int(item["version_no"]), ) async def rollback_release( self, release_id: str, access_token: str | None = None, ) -> ReleaseLifecycleResponse | None: # Fetch the target release to get experiment_id and version_no target = await self.repository.get(release_id, access_token=access_token) if not target: return None experiment_id = str(target["experiment_id"]) target_status = str(target.get("status", "")) if target_status != "published": raise HTTPException( status_code=409, detail=f"Release '{release_id}' is not published; rollback is only allowed for published releases.", ) current_version_no = int(target["version_no"]) # Find the most recent non-archived release with an earlier version_no to restore. previous_candidates = await self.repository.list( params={ "filter[experiment_id][_eq]": experiment_id, "filter[version_no][_lt]": str(current_version_no), "filter[status][_neq]": "archived", "sort": "-version_no", "limit": "1", }, access_token=access_token, ) if not previous_candidates: raise HTTPException( status_code=409, detail=f"Release '{release_id}' cannot rollback because no earlier non-archived release exists.", ) # Demote current published release, then promote previous release. await self.repository.update(release_id, {"status": "draft"}, access_token=access_token) restored_id = str(previous_candidates[0]["id"]) restored = await self.repository.update( restored_id, {"status": "published"}, access_token=access_token, ) if not restored: raise HTTPException( status_code=500, detail="Rollback failed while promoting the target previous release.", ) await self._enforce_single_published( experiment_id=experiment_id, keep_release_id=restored_id, access_token=access_token, ) return ReleaseLifecycleResponse( id=str(restored["id"]), status=str(restored["status"]), version_no=int(restored["version_no"]), ) async def archive_release( self, release_id: str, access_token: str | None = None, ) -> ReleaseLifecycleResponse | None: item = await self.repository.update(release_id, {"status": "archived"}, access_token=access_token) if not item: return None return ReleaseLifecycleResponse( id=str(item["id"]), status=str(item["status"]), version_no=int(item["version_no"]), )