fix filter purchase query param and search

internal/modules/purchases/services/purchase.service.go

@@ -175,6 +175,7 @@ func (s *purchaseService) GetAll(c *fiber.Ctx, params *validation.Query) ([]enti
 	for i := range approvalStatuses {
 		approvalStatuses[i] = normalizeApprovalStatusFilter(approvalStatuses[i])
 	}
+	approvalStatus := normalizeApprovalStatusFilter(params.ApprovalStatus)
 
 	purchases, total, err := s.PurchaseRepo.GetAll(c.Context(), offset, params.Limit, func(db *gorm.DB) *gorm.DB {
 		db = s.withRelations(db)
@@ -195,9 +196,14 @@ func (s *purchaseService) GetAll(c *fiber.Ctx, params *validation.Query) ([]enti
 			db = db.Where("purchases.po_date >= ?", *poDateStart)
 		}
 
+		if poDateStart != nil {
+			db = db.Where("purchases.po_date >= ?", *poDateStart)
+		}
+
 		if poDateEnd != nil {
 			db = db.Where("purchases.po_date < ?", *poDateEnd)
 		}
+
 		if scope.Restrict {
 			if len(scope.IDs) == 0 {
 				return db.Where("1 = 0")
@@ -320,6 +326,70 @@ func (s *purchaseService) GetAll(c *fiber.Ctx, params *validation.Query) ([]enti
 			)
 		}
 
+		if approvalStatus != "" {
+			approvalLike := "%" + approvalStatus + "%"
+			db = db.Where(
+				`EXISTS (
+					SELECT 1
+					FROM approvals a
+					WHERE a.approvable_type = ?
+						AND a.approvable_id = purchases.id
+						AND a.id = (
+							SELECT a2.id
+							FROM approvals a2
+							WHERE a2.approvable_type = ?
+								AND a2.approvable_id = purchases.id
+							ORDER BY a2.action_at DESC, a2.id DESC
+							LIMIT 1
+						)
+						AND (
+							LOWER(COALESCE(a.step_name, '')) LIKE ?
+							OR LOWER(COALESCE(CAST(a.action AS TEXT), '')) LIKE ?
+							OR CAST(a.step_number AS TEXT) = ?
+						)
+				)`,
+				utils.ApprovalWorkflowPurchase.String(),
+				utils.ApprovalWorkflowPurchase.String(),
+				approvalLike,
+				approvalLike,
+				approvalStatus,
+			)
+		}
+
+		if search != "" {
+			like := "%" + search + "%"
+			db = db.Where(
+				`(
+					LOWER(COALESCE(purchases.pr_number, '')) LIKE ?
+					OR LOWER(COALESCE(purchases.po_number, '')) LIKE ?
+					OR EXISTS (
+						SELECT 1
+						FROM suppliers s
+						WHERE s.id = purchases.supplier_id
+							AND LOWER(COALESCE(s.name, '')) LIKE ?
+					)
+					OR EXISTS (
+						SELECT 1
+						FROM users u
+						WHERE u.id = purchases.created_by
+							AND LOWER(COALESCE(u.name, '')) LIKE ?
+					)
+					OR EXISTS (
+						SELECT 1
+						FROM purchase_items pi
+						JOIN products p ON p.id = pi.product_id
+						WHERE pi.purchase_id = purchases.id
+							AND LOWER(COALESCE(p.name, '')) LIKE ?
+					)
+				)`,
+				like,
+				like,
+				like,
+				like,
+				like,
+			)
+		}
+
 		return db.Order("created_at DESC").Order("purchases.id DESC")
 	})