add total amount in home page

pkg/api/overviews.go

@@ -0,0 +1,103 @@
+package api
+
+import (
+	"strings"
+
+	"github.com/mayswind/lab/pkg/core"
+	"github.com/mayswind/lab/pkg/errs"
+	"github.com/mayswind/lab/pkg/log"
+	"github.com/mayswind/lab/pkg/models"
+	"github.com/mayswind/lab/pkg/services"
+	"github.com/mayswind/lab/pkg/utils"
+)
+
+// OverviewApi represents overview api
+type OverviewApi struct {
+	transactions *services.TransactionService
+}
+
+// Initialize an overview api singleton instance
+var (
+	Overviews = &OverviewApi{
+		transactions: services.Transactions,
+	}
+)
+
+// TransactionOverviewHandler returns transaction over of current user
+func (a *OverviewApi) TransactionOverviewHandler(c *core.Context) (interface{}, *errs.Error) {
+	var transactionOverviewReq models.TransactionOverviewRequest
+	err := c.ShouldBindQuery(&transactionOverviewReq)
+
+	if err != nil {
+		log.WarnfWithRequestId(c, "[overviews.TransactionOverviewHandler] parse request failed, because %s", err.Error())
+		return nil, errs.NewIncompleteOrIncorrectSubmissionError(err)
+	}
+
+	items := strings.Split(transactionOverviewReq.Query, "|")
+	requestItems := make([]*models.TransactionOverviewRequestItem, 0, len(items))
+
+	for i := 0; i < len(items); i++ {
+		itemValues := strings.Split(items[i], "_")
+
+		if len(itemValues) != 3 {
+			log.WarnfWithRequestId(c, "[overviews.TransactionOverviewHandler] parse request item failed, because its not valid item, content is \"%s\"", items[i])
+			continue
+		}
+
+		startTime, err := utils.StringToInt64(itemValues[1])
+
+		if err != nil {
+			log.WarnfWithRequestId(c, "[overviews.TransactionOverviewHandler] parse request item start time failed, because %s", err.Error())
+			continue
+		}
+
+		endTime, err := utils.StringToInt64(itemValues[2])
+
+		if err != nil {
+			log.WarnfWithRequestId(c, "[overviews.TransactionOverviewHandler] parse request item end time failed, because %s", err.Error())
+			continue
+		}
+
+		requestItem := &models.TransactionOverviewRequestItem{
+			Name: itemValues[0],
+			StartTime: startTime,
+			EndTime: endTime,
+		}
+
+		requestItems = append(requestItems, requestItem)
+	}
+
+	if len(requestItems) < 1 {
+		log.WarnfWithRequestId(c, "[overviews.TransactionOverviewHandler] parse request failed, because there are no valid items")
+		return nil, errs.ErrQueryItemsEmpty
+	}
+
+	if len(requestItems) > 5 {
+		log.WarnfWithRequestId(c, "[overviews.TransactionOverviewHandler] parse request failed, because there are too many items")
+		return nil, errs.ErrQueryItemsTooMuch
+	}
+
+	uid := c.GetCurrentUid()
+
+	overviewResp := make(map[string]*models.TransactionOverviewResponseItem)
+
+	for i := 0; i < len(requestItems); i++ {
+		requestItem := requestItems[i]
+
+		incomeAmount, expenseAmount, err := a.transactions.GetTotalIncomeAndExpenseByDateRange(uid, requestItem.StartTime, requestItem.EndTime)
+
+		if err != nil {
+			log.ErrorfWithRequestId(c, "[overviews.TransactionOverviewHandler] failed to get transaction overview item for user \"uid:%d\", because %s", uid, err.Error())
+			return nil, errs.ErrOperationFailed
+		}
+
+		overviewResp[requestItem.Name] = &models.TransactionOverviewResponseItem{
+			StartTime: requestItem.StartTime,
+			EndTime: requestItem.EndTime,
+			IncomeAmount: incomeAmount,
+			ExpenseAmount: expenseAmount,
+		}
+	}
+
+	return overviewResp, nil
+}