feat: game engine fetch battle api

game/internal/controller/controller.go

@@ -38,6 +38,10 @@ type Repo interface {
 	// SaveBattle stores a new battle protocol and battle meta data for turn t
 	SaveBattle(uint, *report.BattleReport, *game.BattleMeta) error
 
+	// LoadBattle reads battle's protocol for turn t and battle id.
+	// Returns false if battle with such id was never stored at turn t
+	LoadBattle(t uint, id uuid.UUID) (*report.BattleReport, bool, error)
+
 	// SaveBombing stores all prodused bombings for turn t
 	SaveBombings(uint, []*game.Bombing) error
 
@@ -143,6 +147,14 @@ func FetchOrder(configure func(*Param), actor string, turn uint) (order *order.U
 	return ec.fetchOrder(actor, turn)
 }
 
+func FetchBattle(configure func(*Param), turn uint, ID uuid.UUID) (b *report.BattleReport, exists bool, err error) {
+	ec, err := NewRepoController(configure)
+	if err != nil {
+		return nil, false, err
+	}
+	return ec.fetchBattle(turn, ID)
+}
+
 func BanishRace(configure func(*Param), actor string) error {
 	ec, err := NewRepoController(configure)
 	if err != nil {
@@ -261,6 +273,14 @@ func (ec *RepoController) fetchOrder(actor string, turn uint) (order *order.User
 	return
 }
 
+func (ec *RepoController) fetchBattle(turn uint, ID uuid.UUID) (order *report.BattleReport, exists bool, err error) {
+	err = ec.executeSafe(func(t uint, c *Controller) error {
+		order, exists, err = ec.Repo.LoadBattle(turn, ID)
+		return err
+	})
+	return
+}
+
 func (ec *RepoController) loadReport(actor string, turn uint) (r *report.Report, err error) {
 	execErr := ec.executeSafe(func(t uint, c *Controller) (exErr error) {
 		id, exErr := c.RaceID(actor)