Perform "addstock" action

lib/api.dart

@@ -59,7 +59,7 @@ class InvenTreeAPI {
 
   String makeApiUrl(String endpoint) {
 
-    return apiUrl + endpoint;
+    return _makeUrl("/api/" + endpoint);
   }
 
   String makeUrl(String endpoint) {
@@ -272,20 +272,18 @@ class InvenTreeAPI {
   }
 
   // Perform a POST request
-  Future<http.Response> post(String url, {Map<String, String> body}) async {
+  Future<http.Response> post(String url, {Map<String, dynamic> body}) async {
 
     var _url = makeApiUrl(url);
-    var _headers = defaultHeaders();
+    var _headers = jsonHeaders();
-    var _body = Map<String, String>();
-
-    // Copy across provided data
-    body.forEach((K, V) => _body[K] = V);
 
     print("POST: " + _url);
 
+    var data = jsonEncode(body);
+
     return http.post(_url,
       headers: _headers,
-      body: _body,
+      body: data,
     );
   }
 
@@ -324,6 +322,13 @@ class InvenTreeAPI {
     return headers;
   }
 
+  Map<String, String> jsonHeaders() {
+
+    var headers = defaultHeaders();
+    headers['Content-Type'] = 'application/json';
+    return headers;
+  }
+
   String _authorizationHeader () {
     if (_token.isNotEmpty) {
       return "Token $_token";

lib/inventree/model.dart

@@ -102,7 +102,7 @@ class InvenTreeModel {
 
     print("GET: $addr ${params.toString()}");
 
-    var response = await InvenTreeAPI().get(addr, params: params);
+    var response = await api.get(addr, params: params);
 
     if (response.statusCode != 200) {
       print("Error retrieving data");
@@ -134,7 +134,7 @@ class InvenTreeModel {
     // TODO - Add "timeout"
     // TODO - Add error catching
 
-    var response = await InvenTreeAPI().get(URL, params:params);
+    var response = await api.get(URL, params:params);
 
     // A list of "InvenTreeModel" items
     List<InvenTreeModel> results = new List<InvenTreeModel>();

lib/inventree/stock.dart

@@ -1,5 +1,6 @@
 import 'dart:convert';
 
+import 'package:http/http.dart' as http;
 import 'model.dart';
 
 import 'package:InvenTree/api.dart';
@@ -155,6 +156,29 @@ class InvenTreeStockItem extends InvenTreeModel {
 
     return item;
   }
+
+  Future<http.Response> addStock(double quan) async {
+
+    // Cannot add stock to a serialized StockItem
+    if (isSerialized()) {
+      return null;
+    }
+
+    // Cannot add negative stock
+    if (quan <= 0) {
+      return null;
+    }
+
+    Map<String, dynamic> data = {
+      "item": {
+        "pk": "${pk}",
+        "quantity": "${quan}",
+      }
+    };
+
+    return api.post("/stock/add/", body: data);
+  }
+
 }
 
 
@@ -196,5 +220,4 @@ class InvenTreeStockLocation extends InvenTreeModel {
 
     return loc;
   }
-
 }

lib/widget/stock_detail.dart

@@ -10,6 +10,7 @@ import 'package:flutter/material.dart';
 import 'package:InvenTree/api.dart';
 
 import 'package:InvenTree/widget/drawer.dart';
+import 'package:flutter/services.dart';
 import 'package:font_awesome_flutter/font_awesome_flutter.dart';
 import 'package:flutter_speed_dial/flutter_speed_dial.dart';
 
@@ -26,6 +27,8 @@ class StockDetailWidget extends StatefulWidget {
 
 class _StockItemDisplayState extends State<StockDetailWidget> {
 
+  final _addStockKey = GlobalKey<FormState>();
+
   _StockItemDisplayState(this.item) {
     // TODO
   }
@@ -37,6 +40,54 @@ class _StockItemDisplayState extends State<StockDetailWidget> {
   }
 
   void _addStock() {
+    showDialog(context: context,
+      builder: (BuildContext context) {
+        return AlertDialog(
+          title: Text("Add Stock"),
+          actions: <Widget>[
+            FlatButton(
+              child: Text("Add"),
+              onPressed: () {
+                _addStockKey.currentState.validate();
+              },
+            )
+          ],
+          content: Form(
+            key: _addStockKey,
+            child: Column(
+              mainAxisSize: MainAxisSize.min,
+              children: <Widget>[
+                TextFormField(
+                  decoration: InputDecoration(labelText: "Stock Quantity"),
+                  keyboardType: TextInputType.numberWithOptions(signed:false, decimal:true),
+                  validator: (value) {
+                    if (value.isEmpty) {
+                      return "Value cannot be empty";
+                    }
+
+                    double quantity = double.tryParse(value);
+
+                    if (quantity == null) {
+                      return "Value cannot be converted to a number";
+                    }
+
+                    if (quantity <= 0) {
+                      return "Value must be positive";
+                    }
+
+                    print("Adding stock!");
+
+                    item.addStock(quantity).then((var response) {
+                      print("added stock");
+                    });
+                  },
+                ),
+              ],
+            )
+          ),
+        );
+      }
+    );
     // TODO - Form for adding stock
   }