From a9e4265c19c82a1c16d9de2b9bbf8599cd4d11f3 Mon Sep 17 00:00:00 2001
From: Pavel Shevaev <pacha.shevaev@gmail.com>
Date: Wed, 7 Dec 2022 16:11:32 +0300
Subject: [PATCH] Gradually adding support for all features

---
 tpl/macro.twig | 71 ++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 69 insertions(+), 2 deletions(-)

diff --git a/tpl/macro.twig b/tpl/macro.twig
index 06594a4..d5f8c65 100644
--- a/tpl/macro.twig
+++ b/tpl/macro.twig
@@ -334,8 +334,26 @@ public class {{o.name}} : IRpc
 
 {%- macro diffable_support(o) -%}
 
+    public bool GetDiff({{o.name}} old, {{o.name}} diff = null, List<DataClassIds> removed = null)
+    {
+      if(diff != null) 
+        diff.reset();
+      bool no_changes = true;
+
+    {% set field_idx = -1 %}
+    {%- for f in o.fields ~%}
+      {% set field_idx = field_idx + 1 %}
+      
+      {%- if not has_token(f, 'nodiff') -%}
+      {{_self.field_diff(f, field_idx)}}
+      {%- endif -%}
+    {% endfor %}
+
+     return !no_changes;
+    }
+    
     {% for u in get_diff_related_units(o) %}
-    {{_self.diff_methods(u)}}
+    {{_self.diff_methods_for(u)}}
     {% endfor %}
 
     static public List<ulong> GetClassRemovedIds(List<DataClassIds> removed_ids, uint class_id) 
@@ -369,7 +387,7 @@ public class {{o.name}} : IRpc
 
 {% endmacro %}
 
-{%- macro diff_methods(u) -%}
+{%- macro diff_methods_for(u) -%}
 
   static public bool DiffOne(ref {{u.name}} curr, {{u.name}} old)
   {
@@ -482,3 +500,52 @@ public class {{o.name}} : IRpc
 {% macro compare_func_name(o) %}
 {{has_token(u, 'bitfields')?'CompareAndMarkFields':'IsEqual'}}
 {% endmacro %}
+
+{%- macro field_diff(f, field_idx) -%}
+
+{% if f.type is instanceof('\\mtgMetaStruct') %}
+  {%- if not has_token(f.type, 'POD') -%}
+    Error("Diffable struct '" ~ f.type ~ "' must be POD");
+  {%- endif -%}
+
+  {
+    var __tmp = {{f.name}};
+    if(DiffOne(ref __tmp, old.{{f.name}})) 
+    { 
+      no_changes &= false; 
+      if(diff != null) 
+      { 
+        diff.{{f.name}} = __tmp; 
+        Meta.SetFieldDirty(ref diff.fields_mask, {{field_idx}}); 
+      } 
+    }
+  }
+{% elseif f.type is instanceof('\\mtgArrType') %}
+  {%- if not has_token(f.type.value, 'POD') -%}
+    Error("Diffable struct '" ~ f.type.value ~ "' must be POD");
+  {%- endif -%}
+
+  if(DiffCollection({{f.name}}, old.{{f.name}}, 
+      diff == null ? null : diff.{{f.name}}, 
+      removed
+     )) 
+  { 
+    no_changes &= false; 
+    if(diff != null) 
+      Meta.SetFieldDirty(ref diff.fields_mask, {{field_idx}}); 
+  }
+{% elseif f.type is instanceof('\\mtgBuiltinType') %}
+  if(diff != null) 
+    diff.{{f.name}} = {{f.name}};
+
+  if({{f.name}} != old.{{f.name}}) 
+  { 
+    no_changes &= false; 
+    if(diff != null) 
+      Meta.SetFieldDirty(ref diff.fields_mask, {{field_idx}}); 
+  }
+{% else %}
+    Error("Diff for field '"~ f.name ~"' is not supported");
+{% endif %}
+
+{% endmacro %}