From 2c01d53b9dc5872b0ca384bce8a190c5aaa72536 Mon Sep 17 00:00:00 2001
From: Ritchie Cunningham <ritchie@ritchiecunningham.co.uk>
Date: Sat, 27 Sep 2025 00:34:38 +0100
Subject: [PATCH] [Add] Add single-player mode.

---
 client/CMakeLists.txt   | 11 ++++++++++-
 client/src/main.cpp     | 32 ++++++++++++++++++++++++++++++++
 client/src/terminal.cpp |  9 ++++-----
 3 files changed, 46 insertions(+), 6 deletions(-)

diff --git a/client/CMakeLists.txt b/client/CMakeLists.txt
index 577bfec..b590e4e 100644
--- a/client/CMakeLists.txt
+++ b/client/CMakeLists.txt
@@ -1,16 +1,25 @@
 file(GLOB_RECURSE CLIENT_SOURCES "src/*.cpp")
+# Explicitly list server sources needed for single-player to avoid main() conflict.
+set(SERVER_SOURCES
+  "../server/src/network_manager.cpp"
+  "../server/src/player.cpp"
+)
 
 add_executable(bettolac
   ${CLIENT_SOURCES}
+  ${SERVER_SOURCES}
 )
 
 find_package(SDL3 REQUIRED)
 find_package(GLEW REQUIRED)
 find_package(OpenGL REQUIRED)
 find_package(Freetype REQUIRED)
+find_package(Threads REQUIRED)
 
 target_link_libraries(bettolac PRIVATE bettola SDL3::SDL3 ${GLEW_LIBRARIES}
-  ${OPENGL_LIBRARIES} ${FREETYPE_LIBRARIES})
+  ${OPENGL_LIBRARIES} ${FREETYPE_LIBRARIES} Threads::Threads)
 
 target_include_directories(bettolac PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/src
+  # Add server include dir for single player mode.
+  ${CMAKE_SOURCE_DIR}/server/src
   ${GLEW_INCLUDE_DIRS} ${OPENGL_INCLUDE_DIR} ${FREETYPE_INCLUDE_DIRS})
diff --git a/client/src/main.cpp b/client/src/main.cpp
index d616faf..e3f27db 100644
--- a/client/src/main.cpp
+++ b/client/src/main.cpp
@@ -4,14 +4,46 @@
 #include <SDL3/SDL.h>
 #include <SDL3/SDL_keyboard.h>
 
+/* For single player mode. */
+#include <random>
+#include <string>
+#include <thread>
+#include <chrono>
+#include "../../server/src/network_manager.h"
+
 #include "terminal.h"
 #include "gfx/shape_renderer.h"
 #include "ui/desktop.h"
 #include "ui/ui_window.h"
 
+void run_server(void) {
+  try {
+    NetworkManager server;
+    server.start(1337);
+    /*
+     * Server's start() method is non-blocking, but NetworkManager
+     * object must be kept alive. We'll just loop forever and let the OS
+     * clean up the thread when main exits ;)
+     */
+    while(true) {
+      std::this_thread::sleep_for(std::chrono::seconds(5));
+    }
+  } catch(const std::exception& e) {
+    fprintf(stderr, "Single-player server thread exception: %s\n", e.what());
+  }
+}
+
 const int SCREEN_WIDTH  = 1280;
 const int SCREEN_HEIGHT = 720;
 int main(int argc, char** argv) {
+  if(argc > 1 && std::string(argv[1]) == "-sp") {
+    fprintf(stdout, "Starting in single-player mode...\n");
+    std::thread server_thread(run_server);
+    server_thread.detach();
+    fprintf(stdout, "Waiting for server initialise...\n");
+    std::this_thread::sleep_for(std::chrono::milliseconds(200));
+  }
+
   /* Init SDL. */
   if(!SDL_Init(SDL_INIT_VIDEO)) {
     printf("SDL could not initialise! SDL_ERROR: %s\n", SDL_GetError());
diff --git a/client/src/terminal.cpp b/client/src/terminal.cpp
index bd9d5ce..6f47146 100644
--- a/client/src/terminal.cpp
+++ b/client/src/terminal.cpp
@@ -4,7 +4,6 @@
 #include <GL/glew.h>
 #include <SDL3/SDL_events.h>
 #include <sstream>
-#include <algorithm>
 
 #include "terminal.h"
 #include "client_network.h"
@@ -15,10 +14,10 @@ Terminal::Terminal(void) {
   _history.push_back("Welcome to Bettola");
   _history.push_back("Connecting to server...");
 
-  _network      = std::make_unique<ClientNetwork>();
-  _should_close = false;
-  _scroll_offset = 0;
-  _prompt       = "";
+  _network        = std::make_unique<ClientNetwork>();
+  _should_close   = false;
+  _scroll_offset  = 0;
+  _prompt         = "";
 
   /* TODO: Move network to main.cpp, or better yet, a dedicatated game state file */
   if(_network->connect("127.0.0.1", 1337)) {