fix: recover battle damage from statistics

internal/common/battle_report_test.go

@@ -101,3 +101,47 @@ func TestBattleReportSerialization(t *testing.T) {
 		t.Fatal("expected error after clearing report, got nil")
 	}
 }
+
+func TestBattleReportUsesAvatarDamageEventsWhenAvatarTotalsAreZero(t *testing.T) {
+	stt := &goproto.BattleStatistics{
+		BattleAvatarList: []*goproto.AvatarBattleInfo{
+			{Id: 1503},
+			{Id: 1511},
+		},
+		OKFALMGFHMA: []*goproto.HDKEPPDIDIH{
+			{AvatarId: 1503, Damage: 720},
+			{AvatarId: 1503, Damage: 180},
+			{AvatarId: 1511, Damage: 100},
+		},
+		MonsterList: []*goproto.MonsterBattleInfo{{TotalDamageTaken: 1000}},
+	}
+
+	report := BattleReportFromStatistics(stt, 1, 1052106, "WIN")
+	if report.TeamTotalDamage != 1000 {
+		t.Fatalf("expected event-derived team damage 1000, got %f", report.TeamTotalDamage)
+	}
+	if report.Avatars[0].TotalDamage != 900 || report.Avatars[0].DamagePercent != 90 {
+		t.Fatalf("unexpected avatar 1503 report: %+v", report.Avatars[0])
+	}
+	if report.Avatars[1].TotalDamage != 100 || report.Avatars[1].DamagePercent != 10 {
+		t.Fatalf("unexpected avatar 1511 report: %+v", report.Avatars[1])
+	}
+}
+
+func TestBattleReportFallsBackToMonsterDamageTakenForTeamTotal(t *testing.T) {
+	stt := &goproto.BattleStatistics{
+		BattleAvatarList: []*goproto.AvatarBattleInfo{{Id: 1503}},
+		MonsterList: []*goproto.MonsterBattleInfo{
+			{TotalDamageTaken: 250},
+			{TotalDamageTaken: 750},
+		},
+	}
+
+	report := BattleReportFromStatistics(stt, 1, 1052106, "WIN")
+	if report.TeamTotalDamage != 1000 {
+		t.Fatalf("expected monster-derived team damage 1000, got %f", report.TeamTotalDamage)
+	}
+	if report.Avatars[0].DamagePercent != 0 {
+		t.Fatalf("cannot infer avatar share from monster totals, got %f", report.Avatars[0].DamagePercent)
+	}
+}