From 71ed09a6f70901c9097973a44b24d6a6ced2834f Mon Sep 17 00:00:00 2001
From: jacqueline <me@jacqueline.id.au>
Date: Tue, 14 Nov 2023 13:20:04 +1100
Subject: Add two-way databinding for lua, and flesh out the lua statusbar

---
 src/lua/include/bridge.hpp     |  9 ++++++++
 src/lua/include/lua_thread.hpp |  2 ++
 src/lua/include/property.hpp   | 47 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 58 insertions(+)
 create mode 100644 src/lua/include/property.hpp

(limited to 'src/lua/include')

diff --git a/src/lua/include/bridge.hpp b/src/lua/include/bridge.hpp
index 059d0604..26401d14 100644
--- a/src/lua/include/bridge.hpp
+++ b/src/lua/include/bridge.hpp
@@ -11,19 +11,28 @@
 
 #include "lua.hpp"
 #include "lvgl.h"
+#include "property.hpp"
 #include "service_locator.hpp"
 
 namespace lua {
 
 class Bridge {
  public:
+  static auto Get(lua_State* state) -> Bridge*;
+
   Bridge(system_fsm::ServiceLocator&, lua_State& s);
 
+  auto AddPropertyModule(
+      const std::string&,
+      std::vector<std::pair<std::string, std::shared_ptr<Property>>>) -> void;
+
   system_fsm::ServiceLocator& services() { return services_; }
+  PropertyBindings& bindings() { return bindings_; }
 
  private:
   system_fsm::ServiceLocator& services_;
   lua_State& state_;
+  PropertyBindings bindings_;
 };
 
 }  // namespace lua
diff --git a/src/lua/include/lua_thread.hpp b/src/lua/include/lua_thread.hpp
index 381b1bdb..939d0cda 100644
--- a/src/lua/include/lua_thread.hpp
+++ b/src/lua/include/lua_thread.hpp
@@ -27,6 +27,8 @@ class LuaThread {
 
   auto RunScript(const std::string& path) -> bool;
 
+  auto bridge() -> Bridge& { return *bridge_; }
+
  private:
   LuaThread(std::unique_ptr<Allocator>&, std::unique_ptr<Bridge>&, lua_State*);
 
diff --git a/src/lua/include/property.hpp b/src/lua/include/property.hpp
new file mode 100644
index 00000000..b6b4718f
--- /dev/null
+++ b/src/lua/include/property.hpp
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#pragma once
+
+#include <memory>
+#include <string>
+
+#include "lua.hpp"
+#include "lvgl.h"
+#include "service_locator.hpp"
+
+namespace lua {
+
+using LuaValue = std::variant<std::monostate, int, float, bool, std::string>;
+
+class Property {
+ public:
+  Property() : Property(std::monostate{}) {}
+  Property(const LuaValue&);
+  Property(const LuaValue&, std::function<bool(const LuaValue&)>);
+
+  auto IsTwoWay() -> bool { return cb_.has_value(); }
+
+  auto PushValue(lua_State& s) -> int;
+  auto PopValue(lua_State& s) -> bool;
+  auto Update(const LuaValue& new_val) -> void;
+
+  auto AddLuaBinding(lua_State*, int ref) -> void;
+
+ private:
+  LuaValue value_;
+  std::optional<std::function<bool(const LuaValue&)>> cb_;
+  std::vector<std::pair<lua_State*, int>> bindings_;
+};
+
+class PropertyBindings {
+ public:
+  PropertyBindings(lua_State&);
+
+  auto Register(lua_State*, Property*) -> void;
+};
+
+}  // namespace lua
-- 
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