Seed provenance + inventory: source links and seed lots (#50) (#64)

Co-authored-by: Steve Dudenhoeffer <[email protected]>

internal/service/plantings.go

@@ -50,6 +50,9 @@ type PlantingInput struct {
 	Count     *int
 	Label     *string
 	PlantedAt *string
+	// SeedLotID attributes this planting to a purchase, so the lot can report
+	// what's left. Optional.
+	SeedLotID *int64
 }
 
 // PlantingPatch is a partial update. The nullable fields (Count/Label/PlantedAt/
@@ -68,6 +71,8 @@ type PlantingPatch struct {
 	PlantedAt    *string
 	SetRemovedAt bool
 	RemovedAt    *string
+	SetSeedLotID bool
+	SeedLotID    *int64
 }
 
 // CreatePlanting places a plop in a plantable object the actor can edit.
@@ -93,6 +98,7 @@ func (s *Service) CreatePlanting(ctx context.Context, actorID, objectID int64, i
 		Count:     in.Count,
 		Label:     trimStringPtr(in.Label),
 		PlantedAt: in.PlantedAt,
+		SeedLotID: in.SeedLotID,
 	}
 	if p.PlantedAt == nil {
 		today := s.now().UTC().Format(dateLayout)
@@ -101,6 +107,9 @@ func (s *Service) CreatePlanting(ctx context.Context, actorID, objectID int64, i
 	if err := finalizePlanting(p, o, true); err != nil {
 		return nil, err
 	}
+	if err := s.checkSeedLotForPlanting(ctx, actorID, p.SeedLotID, p.PlantID); err != nil {
+		return nil, err
+	}
 	created, err := s.store.CreatePlanting(ctx, p)
 	if err != nil {
 		return nil, err
@@ -148,6 +157,11 @@ func (s *Service) UpdatePlanting(ctx context.Context, actorID, plantingID int64,
 	if err := finalizePlanting(pl, o, checkBounds); err != nil {
 		return nil, err
 	}
+	// Re-checked on every update, not just when the lot changes: a plant swap can
+	// leave a previously-valid attribution pointing at a lot of the wrong variety.
+	if err := s.checkSeedLotForPlanting(ctx, actorID, pl.SeedLotID, pl.PlantID); err != nil {
+		return nil, err
+	}
 	pl.Version = version
 
 	updated, err := s.store.UpdatePlanting(ctx, pl)
@@ -249,6 +263,9 @@ func applyPlantingPatch(pl *domain.Planting, p PlantingPatch) {
 	if p.SetRemovedAt {
 		pl.RemovedAt = p.RemovedAt
 	}
+	if p.SetSeedLotID {
+		pl.SeedLotID = p.SeedLotID
+	}
 }
 
 // finalizePlanting validates a built/merged plop against its parent object.