From 7291dc9272acc6b42c3f2986c86d3b1c281912ab Mon Sep 17 00:00:00 2001
From: Oliver <oliver.henry.walters@gmail.com>
Date: Thu, 15 Jul 2021 23:58:09 +1000
Subject: [PATCH] Extract field information from the server

---
 lib/api_form.dart        | 76 ++++++++++++++++++++++++++++++++++++++++
 lib/inventree/model.dart |  3 +-
 2 files changed, 77 insertions(+), 2 deletions(-)
 create mode 100644 lib/api_form.dart

diff --git a/lib/api_form.dart b/lib/api_form.dart
new file mode 100644
index 00000000..21d037d1
--- /dev/null
+++ b/lib/api_form.dart
@@ -0,0 +1,76 @@
+import 'dart:convert';
+
+import 'package:InvenTree/api.dart';
+
+/*
+ * Extract field options from a returned OPTIONS request
+ */
+Map<String, dynamic> extractFields(dynamic options) {
+
+  if (options == null) {
+    return {};
+  }
+
+  if (!options.containsKey("actions")) {
+    return {};
+  }
+
+  var actions = options["actions"];
+
+  return actions["POST"] ?? actions["PUT"] ?? actions["PATCH"] ?? {};
+}
+
+/*
+ * Launch an API-driven form,
+ * which uses the OPTIONS metadata (at the provided URL)
+ * to determine how the form elements should be rendered!
+ */
+
+Future<bool> launchApiForm(String url, Map<String, dynamic> fields, {String method = "PATCH"}) async {
+
+  dynamic options = await InvenTreeAPI().options(url);
+
+  // null response from server
+  if (options == null) {
+    return false;
+  }
+
+  var availableFields = extractFields(options);
+
+  if (availableFields.isEmpty) {
+    print("Empty fields {} returned from ${url}");
+    return false;
+  }
+
+  // Iterate through the provided fields we wish to display
+  for (String fieldName in fields.keys) {
+
+    // Check that the field is actually available at the API endpoint
+    if (!availableFields.containsKey(fieldName)) {
+      print("Field '${fieldName}' not available at '${url}'");
+      continue;
+    }
+
+    var remoteField = availableFields[fieldName] ?? {};
+    var localField = fields[fieldName] ?? {};
+
+    // Override defined field parameters, if provided
+    for (String key in localField.keys) {
+      // Special consideration
+      if (key == "filters") {
+
+      } else {
+        String? val = localField[key];
+
+        if (val != null) {
+          remoteField[key] = val;
+        }
+      }
+    }
+
+    print("${fieldName} -> ${remoteField.toString()}");
+
+  }
+
+  return true;
+}
\ No newline at end of file
diff --git a/lib/inventree/model.dart b/lib/inventree/model.dart
index 76d558b3..3cc6b916 100644
--- a/lib/inventree/model.dart
+++ b/lib/inventree/model.dart
@@ -126,8 +126,7 @@ class InvenTreeModel {
   }
 
   // Return the API detail endpoint for this Model object
-  String get url => "${URL}/${pk}/";
-
+  String get url => "${URL}/${pk}/".replaceAll("//", "/");
 
   // Search this Model type in the database
   Future<List<InvenTreeModel>> search(BuildContext context, String searchTerm, {Map<String, String> filters = const {}}) async {