Display link to purchase orders on the "company" page

lib/inventree/company.dart

@@ -1,5 +1,9 @@
+import "dart:async";
+import "dart:io";
+
 import "package:inventree/api.dart";
 import "package:inventree/inventree/model.dart";
+import "package:inventree/inventree/purchase_order.dart";
 
 
 /*
@@ -44,6 +48,32 @@ class InvenTreeCompany extends InvenTreeModel {
 
   bool get isCustomer => (jsondata["is_customer"] ?? false) as bool;
 
+  // Request a list of purchase orders against this company
+  Future<List<InvenTreePurchaseOrder>> getPurchaseOrders({bool? outstanding}) async {
+
+    Map<String, String> filters = {
+      "supplier": "${pk}"
+    };
+
+    if (outstanding != null) {
+      filters["outstanding"] = outstanding ? "true" : "false";
+    }
+
+    final List<InvenTreeModel> results = await InvenTreePurchaseOrder().list(
+      filters: filters
+    );
+
+    List<InvenTreePurchaseOrder> orders = [];
+
+    for (InvenTreeModel model in results) {
+      if (model is InvenTreePurchaseOrder) {
+        orders.add(model);
+      }
+    }
+
+    return orders;
+  }
+
   @override
   InvenTreeModel createFromJson(Map<String, dynamic> json) {
     var company = InvenTreeCompany.fromJson(json);

lib/widget/company_detail.dart

@@ -2,12 +2,15 @@
 import "package:inventree/api.dart";
 import "package:inventree/app_colors.dart";
 import "package:inventree/inventree/company.dart";
+import "package:inventree/inventree/purchase_order.dart";
+import "package:inventree/widget/purchase_order_list.dart";
 import "package:inventree/widget/refreshable_state.dart";
 import "package:flutter/cupertino.dart";
 import "package:flutter/material.dart";
 import "package:font_awesome_flutter/font_awesome_flutter.dart";
 import "package:inventree/l10.dart";
 
+
 class CompanyDetailWidget extends StatefulWidget {
 
   const CompanyDetailWidget(this.company, {Key? key}) : super(key: key);
@@ -26,6 +29,8 @@ class _CompanyDetailState extends RefreshableState<CompanyDetailWidget> {
 
   final InvenTreeCompany company;
 
+  List<InvenTreePurchaseOrder> outstandingOrders = [];
+
   @override
   String getAppBarTitle(BuildContext context) => L10().company;
 
@@ -60,6 +65,10 @@ class _CompanyDetailState extends RefreshableState<CompanyDetailWidget> {
   @override
   Future<void> request() async {
     await company.reload();
+
+    if (company.isSupplier) {
+      outstandingOrders = await company.getPurchaseOrders(outstanding: true);
+    }
   }
 
   Future <void> editCompany(BuildContext context) async {
@@ -145,6 +154,26 @@ class _CompanyDetailState extends RefreshableState<CompanyDetailWidget> {
       // TODO - Add list of purchase orders
 
       tiles.add(Divider());
+
+      tiles.add(
+        ListTile(
+          title: Text(L10().purchaseOrders),
+          leading: FaIcon(FontAwesomeIcons.shoppingCart, color: COLOR_CLICK),
+          trailing: Text("${outstandingOrders.length}"),
+          onTap: () {
+            Navigator.push(
+              context,
+              MaterialPageRoute(
+                builder: (context) => PurchaseOrderListWidget(
+                  filters: {
+                    "supplier": "${company.pk}"
+                  }
+                )
+              )
+            );
+          }
+        )
+      );
     }
 
     if (company.isManufacturer) {

lib/widget/home.dart

@@ -82,8 +82,7 @@ class _InvenTreeHomePageState extends State<InvenTreeHomePage> {
     Navigator.push(
       context,
       MaterialPageRoute(
-        builder: (context) => PurchaseOrderListWidget(
-        )
+        builder: (context) => PurchaseOrderListWidget()
       )
     );
   }