feat: game engine fetch battle api

game/internal/repo/game.go

@@ -13,6 +13,7 @@ package repo
 import (
 	"encoding/json"
 	"fmt"
+	"slices"
 
 	"galaxy/model/order"
 	"galaxy/model/report"
@@ -117,9 +118,25 @@ func loadMeta(s Storage) (*game.GameMeta, error) {
 	return result, nil
 }
 
-func saveMeta(s Storage, t uint, gm *game.GameMeta) error {
+func loadTurnMeta(s Storage, turn uint) (*game.GameMeta, error) {
+	var result *game.GameMeta = new(game.GameMeta)
+	path := fmt.Sprintf("%s/%s", TurnDir(turn), metaPath)
+	exist, err := s.Exists(path)
+	if err != nil {
+		return nil, NewStorageError(err)
+	}
+	if !exist {
+		return result, nil
+	}
+	if err := s.ReadSafe(path, result); err != nil {
+		return nil, NewStorageError(err)
+	}
+	return result, nil
+}
+
+func saveMeta(s Storage, turn uint, gm *game.GameMeta) error {
 	// save turn's meta
-	path := fmt.Sprintf("%s/%s", TurnDir(t), metaPath)
+	path := fmt.Sprintf("%s/%s", TurnDir(turn), metaPath)
 	if err := s.Write(path, gm); err != nil {
 		return NewStorageError(err)
 	}
@@ -131,27 +148,43 @@ func saveMeta(s Storage, t uint, gm *game.GameMeta) error {
 	return nil
 }
 
-func (r *repo) SaveBattle(t uint, b *report.BattleReport, m *game.BattleMeta) error {
+func (r *repo) LoadBattle(turn uint, id uuid.UUID) (*report.BattleReport, bool, error) {
+	meta, err := loadTurnMeta(r.s, turn)
+	if err != nil {
+		return nil, false, err
+	}
+	i := slices.IndexFunc(meta.Battles, func(m game.BattleMeta) bool { return m.BattleID == id })
+	if i < 0 {
+		return nil, false, nil
+	}
+	result, err := loadBattle(r.s, turn, meta.Battles[i].BattleID)
+	if err != nil {
+		return nil, false, err
+	}
+	return result, true, nil
+}
+
+func (r *repo) SaveBattle(turn uint, b *report.BattleReport, m *game.BattleMeta) error {
 	meta, err := loadMeta(r.s)
 	if err != nil {
 		return err
 	}
-	err = saveBattle(r.s, t, b)
+	err = saveBattle(r.s, turn, b)
 	if err != nil {
 		return err
 	}
 	meta.Battles = append(meta.Battles, *m)
-	return saveMeta(r.s, t, meta)
+	return saveMeta(r.s, turn, meta)
 }
 
-func saveBattle(s Storage, t uint, b *report.BattleReport) error {
-	path := fmt.Sprintf("%s/battle/%s.json", TurnDir(t), b.ID.String())
+func saveBattle(s Storage, turn uint, b *report.BattleReport) error {
+	path := fmt.Sprintf("%s/battle/%s.json", TurnDir(turn), b.ID.String())
 	exist, err := s.Exists(path)
 	if err != nil {
 		return NewStorageError(err)
 	}
 	if exist {
-		return NewStateError(fmt.Sprintf("battle %v for turn %d already has been saved", b.ID, t))
+		return NewStateError(fmt.Sprintf("battle %v for turn %d already has been saved", b.ID, turn))
 	}
 	if err := s.Write(path, b); err != nil {
 		return NewStorageError(err)
@@ -159,7 +192,23 @@ func saveBattle(s Storage, t uint, b *report.BattleReport) error {
 	return nil
 }
 
-func (r *repo) SaveBombings(t uint, b []*game.Bombing) error {
+func loadBattle(s Storage, turn uint, id uuid.UUID) (*report.BattleReport, error) {
+	path := fmt.Sprintf("%s/battle/%s.json", TurnDir(turn), id.String())
+	exist, err := s.Exists(path)
+	if err != nil {
+		return nil, NewStorageError(err)
+	}
+	if !exist {
+		return nil, NewStateError(fmt.Sprintf("battle %v for turn %d never was saved", id, turn))
+	}
+	result := new(report.BattleReport)
+	if err := s.ReadSafe(path, result); err != nil {
+		return nil, NewStorageError(err)
+	}
+	return result, nil
+}
+
+func (r *repo) SaveBombings(turn uint, b []*game.Bombing) error {
 	meta, err := loadMeta(r.s)
 	if err != nil {
 		return err
@@ -167,11 +216,11 @@ func (r *repo) SaveBombings(t uint, b []*game.Bombing) error {
 	for i := range b {
 		meta.Bombings = append(meta.Bombings, *b[i])
 	}
-	return saveMeta(r.s, t, meta)
+	return saveMeta(r.s, turn, meta)
 }
 
-func (r *repo) SaveReport(t uint, rep *report.Report) error {
-	return saveReport(r.s, t, rep)
+func (r *repo) SaveReport(turn uint, rep *report.Report) error {
+	return saveReport(r.s, turn, rep)
 }
 
 func saveReport(s Storage, t uint, v *report.Report) error {
@@ -182,12 +231,12 @@ func saveReport(s Storage, t uint, v *report.Report) error {
 	return nil
 }
 
-func (r *repo) LoadReport(t uint, id uuid.UUID) (*report.Report, error) {
-	return loadReport(r.s, t, id)
+func (r *repo) LoadReport(turn uint, id uuid.UUID) (*report.Report, error) {
+	return loadReport(r.s, turn, id)
 }
 
-func loadReport(s Storage, t uint, id uuid.UUID) (*report.Report, error) {
-	path := ReportDir(t, id)
+func loadReport(s Storage, turn uint, id uuid.UUID) (*report.Report, error) {
+	path := ReportDir(turn, id)
 	result := new(report.Report)
 	exist, err := s.Exists(path)
 	if err != nil {