feat: bill service

internal/bill/domain.go

@@ -34,6 +34,6 @@ type BillService interface {
 	FetchBills(ctx context.Context, date BDate) (*[]Bill, error)
 	FetchBillByID(ctx context.Context, id int) (*Bill, error)
 	BuildBill(ctx context.Context, bill *Bill) error
-	ModifyBill(ctx context.Context, id int) error
+	ModifyBill(ctx context.Context, bill *Bill) error
 	DestroyBill(ctx context.Context, id int) error
 }

internal/bill/service.go

@@ -0,0 +1,55 @@
+package bill
+
+import (
+	"context"
+	"time"
+)
+
+type billService struct {
+	billRepository BillRepository
+}
+
+func NewBillService(r BillRepository) BillService {
+	return &billService{
+		billRepository: r,
+	}
+}
+
+// FetchBills
+// - date is {year, month, day} when return a day bills
+// - date is {year, month} when return a month bills
+// - date is {year} when return a year bills
+// - date is {} when return all bills
+func (b *billService) FetchBills(ctx context.Context, date BDate) (*[]Bill, error) {
+	if date.Year == 0 && (date.Month != 0 || date.Day != 0) {
+		date.Year = time.Now().Year()
+	} else if date.Month == 0 && date.Day != 0 {
+		date.Month = int(time.Now().Month())
+	}
+	switch {
+	case date.Year == 0:
+		return b.billRepository.GetBills(ctx)
+	case date.Month == 0:
+		return b.billRepository.GetBillByYear(ctx, date.Year)
+	case date.Day == 0:
+		return b.billRepository.GetBillByMonth(ctx, date.Year, date.Month)
+	default:
+		return b.billRepository.GetBillByDate(ctx, date.Year, date.Month, date.Day)
+	}
+}
+
+func (b *billService) FetchBillByID(ctx context.Context, id int) (*Bill, error) {
+	return b.billRepository.GetBillByID(ctx, id)
+}
+
+func (b *billService) BuildBill(ctx context.Context, bill *Bill) error {
+	return b.billRepository.CreateBill(ctx, bill)
+}
+
+func (b *billService) ModifyBill(ctx context.Context, bill *Bill) error {
+	return b.billRepository.UpdateBill(ctx, bill)
+}
+
+func (b *billService) DestroyBill(ctx context.Context, id int) error {
+	return b.billRepository.DeleteBill(ctx, id)
+}