From 2b9ad3fbcbea86bd2cf702ff4c6e603c33492e45 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@gmail.com>
Date: Thu, 25 Jul 2024 14:39:16 +0200
Subject: core/participant: implement basic serialization

---
 core/include/turns/core/participant.hpp |  5 +++
 core/src/participant.cpp                | 28 ++++++++++++++-
 core/tests/participant.cpp              | 62 +++++++++++++++++++++++++++++++++
 3 files changed, 94 insertions(+), 1 deletion(-)

(limited to 'core')

diff --git a/core/include/turns/core/participant.hpp b/core/include/turns/core/participant.hpp
index 8568b03..cd99fbb 100644
--- a/core/include/turns/core/participant.hpp
+++ b/core/include/turns/core/participant.hpp
@@ -8,6 +8,8 @@
 #include <glibmm/refptr.h>
 #include <glibmm/ustring.h>
 
+#include <nlohmann/json_fwd.hpp>
+
 #include <compare>
 
 namespace turns::core
@@ -15,6 +17,7 @@ namespace turns::core
   struct participant : Glib::Object
   {
     auto static create(Glib::ustring name, float priority, disposition disposition) -> Glib::RefPtr<participant>;
+    auto static create(nlohmann::json const & serialized) -> Glib::RefPtr<participant>;
 
     participant();
     participant(Glib::ustring name, float priority, disposition disposition);
@@ -45,6 +48,8 @@ namespace turns::core
       return self.m_priority.get_proxy();
     }
 
+    auto serialize() -> nlohmann::json;
+
   private:
     Glib::Property<core::disposition> m_disposition{*this, "disposition", core::disposition::neutral};
     Glib::Property<bool> m_is_active{*this, "active", false};
diff --git a/core/src/participant.cpp b/core/src/participant.cpp
index 24d1cff..0c32172 100644
--- a/core/src/participant.cpp
+++ b/core/src/participant.cpp
@@ -2,8 +2,11 @@
 
 #include <glibmm/refptr.h>
 
-#include <typeinfo>
+#include <nlohmann/json.hpp>
+
 #include <compare>
+#include <string>
+#include <typeinfo>
 
 namespace turns::core
 {
@@ -12,6 +15,19 @@ namespace turns::core
     return Glib::make_refptr_for_instance(new participant{name, priority, disposition});
   }
 
+  auto participant::create(nlohmann::json const & serialized) -> Glib::RefPtr<participant>
+  {
+    auto active = serialized.value("active", false);
+    auto disposition = serialized.value("disposition", disposition::neutral);
+    auto priority = serialized.value("priority", 0.0f);
+    auto name = serialized.value("name", std::string{});
+
+    auto instance = create(name, priority, disposition);
+    instance->is_active() = active;
+
+    return instance;
+  }
+
   participant::participant()
       : Glib::ObjectBase{typeid(participant)}
       , Glib::Object{}
@@ -31,4 +47,14 @@ namespace turns::core
     return m_priority <=> other.m_priority;
   }
 
+  auto participant::serialize() -> nlohmann::json
+  {
+    return nlohmann::json{
+        {"active",      m_is_active.get_value()                     },
+        {"disposition", m_disposition.get_value()                   },
+        {"name",        static_cast<std::string>(m_name.get_value())},
+        {"priority",    m_priority.get_value()                      },
+    };
+  }
+
 }  // namespace turns::core
\ No newline at end of file
diff --git a/core/tests/participant.cpp b/core/tests/participant.cpp
index 99e7fa4..6ca3f02 100644
--- a/core/tests/participant.cpp
+++ b/core/tests/participant.cpp
@@ -2,8 +2,11 @@
 
 #include "turns/core/disposition.hpp"
 
+#include <catch2/catch_approx.hpp>
 #include <catch2/catch_test_macros.hpp>
 
+#include <nlohmann/json.hpp>
+
 #include <compare>
 
 namespace turns::core::tests
@@ -109,4 +112,63 @@ namespace turns::core::tests
     }
   }
 
+  TEST_CASE("Serializing a participant")
+  {
+    auto instance = participant::create("Participant #0", 17.2, disposition::friendly);
+    auto serialized = instance->serialize();
+
+    SECTION("the active state is de-serialized correctly")
+    {
+      REQUIRE_FALSE(serialized.at("active"));
+    }
+
+    SECTION("the disposition is serialized correctly")
+    {
+      REQUIRE(serialized.at("disposition") == disposition::friendly);
+    }
+
+    SECTION("the name is serialized correctly")
+    {
+      REQUIRE(serialized.at("name") == "Participant #0");
+    }
+
+    SECTION("the priority is serialized correctly")
+    {
+      REQUIRE(serialized.at("priority") == Catch::Approx{17.2});
+    }
+  }
+
+  TEST_CASE("De-Serializing a participant")
+  {
+    auto serialized = nlohmann::json::parse(R"(
+    {
+    "name": "Participant #1",
+    "priority": -2.3,
+    "disposition": 2,
+    "active": true
+    }
+    )");
+    auto instance = participant::create(serialized);
+
+    SECTION("the active state is de-serialized correctly")
+    {
+      REQUIRE(instance->is_active());
+    }
+
+    SECTION("the disposition is de-serialized correctly")
+    {
+      REQUIRE(instance->disposition() == disposition::hostile);
+    }
+
+    SECTION("the name is de-serialized correctly")
+    {
+      REQUIRE(instance->name() == "Participant #1");
+    }
+
+    SECTION("the priority is de-serialized correctly")
+    {
+      REQUIRE(instance->priority() == Catch::Approx{-2.3});
+    }
+  }
+
 }  // namespace turns::core::tests
\ No newline at end of file
-- 
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