Added measurements, and devices statsh

Added stats endpoints

database/invoice/invoice.go

@@ -3,6 +3,7 @@ package invoice
 import (
 	"fmt"
 	"strings"
+	"time"
 
 	"gitlab.com/pactual1/backend/models"
 	"gitlab.com/pactual1/backend/shared"
@@ -66,3 +67,48 @@ func GetInvoices(buyerName string, sortBy string, limit int, offset int, ids []i
 
 	return invoices, total, nil
 }
+
+func CountInvoicesByMultipleStatuses(companyID uint, startTime, endTime time.Time) (int64, int64, map[string]map[string]int64, error) {
+    var claimed, issued int64
+    monthlyCounts := make(map[string]map[string]int64)
+
+    // Iterate through each month within the specified date range
+    for dt := startTime; dt.Before(endTime); dt = dt.AddDate(0, 1, 0) {
+        monthEnd := dt.AddDate(0, 1, 0)
+        if monthEnd.After(endTime) {
+            monthEnd = endTime
+        }
+
+        // Initialize monthlyCounts for the current month
+        monthKey := dt.Format("2006-01")
+        monthlyCounts[monthKey] = map[string]int64{"insurance_claimed": 0, "invoice_issued": 0}
+
+        // Query for 'insurance_claimed' invoices for the current month
+        var monthlyClaimed int64
+        err := shared.GetDb().Model(&models.Invoice{}).
+            Where("status = ? AND (buyer_id = ? OR seller_id = ?) AND invoice_date >= ? AND invoice_due_date <= ?", "insurance_claimed", companyID, companyID, dt, monthEnd).
+            Count(&monthlyClaimed).Error
+        if err != nil {
+            return 0, 0, nil, err
+        }
+
+        // Query for 'invoice_issued' invoices for the current month
+        var monthlyIssued int64
+        err = shared.GetDb().Model(&models.Invoice{}).
+            Where("status = ? AND (buyer_id = ? OR seller_id = ?) AND invoice_date >= ? AND invoice_due_date <= ?", "invoice_issued", companyID, companyID, dt, monthEnd).
+            Count(&monthlyIssued).Error
+        if err != nil {
+            return 0, 0, nil, err
+        }
+
+        // Update the counts for the current month
+        monthlyCounts[monthKey]["insurance_claimed"] = monthlyClaimed
+        monthlyCounts[monthKey]["invoice_issued"] = monthlyIssued
+
+        // Update the total counts
+        claimed += monthlyClaimed
+        issued += monthlyIssued
+    }
+
+    return claimed, issued, monthlyCounts, nil
+}