[Refactor] One GameState to rule them all!

Introduces a central GameState class to manage the client's lifecycle,
network connection and UI components. The Terminal has been demoted to a
pure UI widget and main has been simplified to a basic entrypoint as
they should be!

client/src/game_state.cpp

@@ -0,0 +1,81 @@
+#include <cstdio>
+#include <memory>
+#include <sstream>
+
+#include "game_state.h"
+#include "gfx/shape_renderer.h"
+#include "gfx/txt_renderer.h"
+#include "terminal.h"
+#include "ui/desktop.h"
+#include "ui/ui_window.h"
+
+GameState::GameState(void) = default;
+
+GameState::~GameState(void) = default;
+
+void GameState::init(void) {
+  /* Create and connect the network client. */
+  _network = std::make_unique<ClientNetwork>();
+  if(_network->connect("127.0.0.1", 1337)) {
+    /* TODO: handle connection success message. */
+  } else {
+    /* TODO: handle connection failure. */
+  }
+
+  /* Create the desktop. */
+  _desktop = std::make_unique<Desktop>();
+
+  /*
+   * Create initial terminal window.
+   */
+  auto term = std::make_unique<Terminal>(_network.get()); /* Pass network connection. */
+  auto term_window = std::make_unique<UIWindow>("Terminal", 100, 100, 800, 500);
+  term_window->set_content(std::move(term));
+  _desktop->add_window(std::move(term_window));
+}
+
+void GameState::handle_event(SDL_Event* event) {
+  if(_desktop) {
+    _desktop->handle_event(event);
+  }
+}
+
+void GameState::update(void) {
+  std::string server_msg;
+  while(_network->poll_message(server_msg)) {
+    UIWindow* focused_window = _desktop->get_focused_window();
+    if(!focused_window) continue;
+
+    Terminal* terminal = focused_window->get_content();
+    if(!terminal) continue;
+
+    /* Server sends "output\nprompt", split them. */
+    size_t last_newline = server_msg.find_last_of("\n");
+    if(last_newline != std::string::npos) {
+      std::string prompt = server_msg.substr(last_newline+1);
+      terminal->set_prompt(prompt);
+
+      std::string output = server_msg.substr(0, last_newline);
+      if(!output.empty()) {
+        /* split the multiline output and push each line to history. */
+        std::stringstream ss(output);
+        std::string line;
+        while(std::getline(ss, line, '\n')) {
+          terminal->add_history(line);
+        }
+      }
+    } else {
+      terminal->add_history(server_msg);
+    }
+  }
+  if(_desktop) {
+    _desktop->update();
+  }
+}
+
+void GameState::render(ShapeRenderer* shape_renderer, TextRenderer* txt_renderer,
+                       int screen_height, bool show_cursor) {
+  if(_desktop) {
+    _desktop->render(shape_renderer, txt_renderer, screen_height, show_cursor);
+  }
+}

client/src/game_state.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <memory>
+
+class ClientNetwork;
+class Desktop;
+class ShapeRenderer;
+class TextRenderer;
+union SDL_Event;
+
+class GameState {
+public:
+  GameState(void);
+  ~GameState(void);
+
+  void init(void);
+  void handle_event(SDL_Event* event);
+  void update(void);
+  void render(ShapeRenderer* shape_renderer, TextRenderer* txt_renderer,
+              int screen_height, bool show_cursor);
+
+private:
+  std::unique_ptr<ClientNetwork> _network;
+  std::unique_ptr<Desktop>       _desktop;
+};

client/src/main.cpp

@@ -10,10 +10,9 @@
 #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"
+#include "gfx/txt_renderer.h"
+#include "game_state.h"
 
 void run_server(void) {
   try {
@@ -104,16 +103,8 @@ int main(int argc, char** argv) {
   /* Init shape renderer. */
   ShapeRenderer* shape_renderer_instance = new ShapeRenderer(SCREEN_WIDTH, SCREEN_HEIGHT);
 
-  /* Create terminal. */
-  auto term = std::make_unique<Terminal>();
-
-  /* Create UI window and pass it a terminal. */
-  auto test_window = std::make_unique<UIWindow>("Terminal", 100, 100, 800, 500);
-  test_window->set_content(std::move(term));
-
-  /* Create desktop and add the window. */
-  auto desktop = std::make_unique<Desktop>();
-  desktop->add_window(std::move(test_window));
+  auto game_state = std::make_unique<GameState>();
+  game_state->init();
 
   /* timer for cursor blink. */
   Uint32 last_blink_time = 0;
@@ -125,10 +116,10 @@ int main(int argc, char** argv) {
     SDL_Event event;
     while(SDL_PollEvent(&event)) {
       if(event.type == SDL_EVENT_QUIT) { running = false; }
-      desktop.get()->handle_event(&event);
+      game_state->handle_event(&event);
     }
 
-    desktop.get()->update();
+    game_state->update();
 
     Uint32 current_time = SDL_GetTicks();
     if(current_time - last_blink_time > 500) { /* Every 500ms. */
@@ -140,14 +131,14 @@ int main(int argc, char** argv) {
     glClearColor(0.1f, 0.1f, 0.1, 1.0f);
     glClear(GL_COLOR_BUFFER_BIT);
 
-    desktop.get()->render(shape_renderer_instance, txt_render_instance, SCREEN_HEIGHT, show_cursor);
+    game_state->render(shape_renderer_instance, txt_render_instance, SCREEN_HEIGHT, show_cursor);
 
     /* It's really odd to call it SwapWindow now, rather than SwapBuffer. */
     SDL_GL_SwapWindow(window);
   }
 
   /* Cleanup. */
-  desktop.reset();
+  game_state.reset();
   delete shape_renderer_instance;
   delete txt_render_instance;
   SDL_GL_DestroyContext(context);

client/src/terminal.cpp

@@ -1,73 +1,44 @@
 #include <cstdio>
-#include <memory>
 #include <SDL3/SDL.h>
 #include <GL/glew.h>
 #include <SDL3/SDL_events.h>
-#include <sstream>
 
 #include "terminal.h"
 #include "client_network.h"
 #include "gfx/txt_renderer.h"
 
-Terminal::Terminal(void) {
+Terminal::Terminal(ClientNetwork* network) : _network(network) {
   /* Placeholder welcome message to history. */
-  _history.push_back("Welcome to Bettola");
-  _history.push_back("Connecting to server...");
-
-  _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)) {
-    _history.push_back("Connection successful.");
-  } else {
-    _history.push_back("Connection failed. Please restart.");
-    _prompt = "error>";
-  }
 }
 
 Terminal::~Terminal(void) {}
 
 void Terminal::update(void) {
-  std::string server_msg;
-  while(_network->poll_message(server_msg)) {
-    if(server_msg == "__CLOSE_CONNECTION__") {
-      _history.push_back("Connection closed by server.");
-      _should_close = true;
-      return;
-    }
-    /* Server will send "output\nprompt". Split them. */
-    size_t last_newline = server_msg.find_last_of('\n');
-    if(last_newline != std::string::npos) {
-      _prompt = server_msg.substr(last_newline+1);
-      std::string output = server_msg.substr(0, last_newline);
-      if(!output.empty()) {
-        /* Split multiline output and push each line to history. */
-        std::stringstream ss(output);
-        std::string line;
-        while(std::getline(ss, line, '\n')) {
-          /* Replace tabs. */
-          std::string line_with_spaces;
-          for(char ch : line) {
-            if(ch == '\t') {
-              line_with_spaces += "   ";
-            } else {
-              line_with_spaces += ch;
-            }
-          }
-          _history.push_back(line_with_spaces);
-        }
-      }
+
+}
+
+void Terminal::add_history(const std::string& line) {
+  std::string line_with_spaces;
+  for(char ch : line) {
+    if(ch == '\t') {
+      line_with_spaces += "   ";
     } else {
-      /*
-       * If there's no newline, it might be the initial welcome message,
-       * or some other non-standard message, just it to history.
-       */
-      _history.push_back(server_msg);
+      line_with_spaces += ch;
     }
   }
+  _history.push_back(line_with_spaces);
+
+  if(line == "__CLOSE_CONNECTION__") {
+    _history.back() = "Connection closed by server.";
+    _should_close = true;
+  }
+}
+
+void Terminal::set_prompt(const std::string& prompt) {
+  _prompt = prompt;
 }
 
 bool Terminal::close(void) { return _should_close; }

client/src/terminal.h

@@ -1,5 +1,4 @@
 #pragma once
-#include <memory>
 #include <string>
 #include <vector>
 #include <SDL3/SDL.h>
@@ -9,13 +8,15 @@
 
 class Terminal {
 public:
-  Terminal(void);
+  Terminal(ClientNetwork* network);
   ~Terminal(void);
 
   void update(void);
   void handle_input(SDL_Event* event);
   void render(TextRenderer* renderer, int x, int y, int width, int height, bool show_cursor);
   void scroll(int amount, int content_height);
+  void add_history(const std::string& line);
+  void set_prompt(const std::string& prompt);
   bool close(void);
 
 private:
@@ -26,5 +27,5 @@ private:
   std::vector<std::string> _history;
   int _scroll_offset;
   std::string _prompt;
-  std::unique_ptr<ClientNetwork> _network;
+  ClientNetwork* _network;
 };

client/src/ui/desktop.cpp

@@ -55,14 +55,7 @@ void Desktop::handle_event(SDL_Event* event) {
 }
 
 void Desktop::update(void) {
-  /* Poll all windows for network updates. */
-  for(auto& window : _windows) {
-    Terminal* term = window->get_content();
-    if(term) {
-      term->update();
-    }
-  }
-
+  /* Remove closed windows. */
   _windows.erase(std::remove_if(_windows.begin(), _windows.end(),
                                 [](const std::unique_ptr<UIWindow>& window) {
                                   Terminal* term = window->get_content();
@@ -71,6 +64,10 @@ void Desktop::update(void) {
                               _windows.end());
 }
 
+UIWindow* Desktop::get_focused_window(void) {
+  return _focused_window;
+}
+
 void Desktop::render(ShapeRenderer* shape_renderer, TextRenderer* txt_renderer,
                      int screen_height, bool show_cursor) {
   for(const auto& win : _windows) {

client/src/ui/desktop.h

@@ -19,6 +19,8 @@ public:
   void render(ShapeRenderer* shape_renderer, TextRenderer* txt_renderer, int screen_height,
               bool show_cursor);
 
+  UIWindow* get_focused_window(void);
+
 private:
   std::vector<std::unique_ptr<UIWindow>> _windows;
   UIWindow* _focused_window;