add transaction statistics api

pkg/models/statistic.go

@@ -0,0 +1,21 @@
+package models
+
+// 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"`
+}
+
+// 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"`
+}