code refactor

pkg/models/transaction.go

@@ -119,6 +119,12 @@ type TransactionListInMonthByPageRequest struct {
 	TrimTag      bool              `form:"trim_tag"`
 }
 
+// TransactionStatisticRequest represents all parameters of transaction statistic request
+type TransactionStatisticRequest struct {
+	StartTime int64 `form:"start_time" binding:"min=0"`
+	EndTime   int64 `form:"end_time" binding:"min=0"`
+}
+
 // TransactionGetRequest represents all parameters of transaction getting request
 type TransactionGetRequest struct {
 	Id           int64 `form:"id,string" binding:"required,min=1"`
@@ -170,6 +176,20 @@ type TransactionInfoPageWrapperResponse2 struct {
 	TotalCount int64                        `json:"total_count"`
 }
 
+// TransactionStatisticResponse represents an item of transaction overview
+type TransactionStatisticResponse struct {
+	StartTime int64                               `json:"startTime"`
+	EndTime   int64                               `json:"endTime"`
+	Items     []*TransactionStatisticResponseItem `json:"items"`
+}
+
+// TransactionStatisticResponseItem represents total amount item for an response
+type TransactionStatisticResponseItem struct {
+	CategoryId  int64 `json:"categoryId,string"`
+	AccountId   int64 `json:"accountId,string"`
+	TotalAmount int64 `json:"amount"`
+}
+
 // IsEditable returns whether this transaction can be edited
 func (t *Transaction) IsEditable(currentUser *User, utcOffset int16, account *Account, relatedAccount *Account) bool {
 	if currentUser == nil || !currentUser.CanEditTransactionByTransactionTime(t.TransactionTime, utcOffset) {