From 73a4f228f6c8c17db4ba9c25b343dc1cf5847cee Mon Sep 17 00:00:00 2001
From: Paul Gilbert
Date: Sun, 18 Aug 2019 15:18:48 -0700
Subject: XEEN: Implement autosave support

---
 engines/xeen/events.cpp |  9 ++++++++-
 engines/xeen/events.h   |  1 +
 engines/xeen/saves.cpp  |  7 ++++++-
 engines/xeen/saves.h    |  9 +++++++++
 engines/xeen/xeen.cpp   | 14 +++++++++++++-
 engines/xeen/xeen.h     | 15 ++++++++++-----
 6 files changed, 47 insertions(+), 8 deletions(-)

diff --git a/engines/xeen/events.cpp b/engines/xeen/events.cpp
index 17306a32fc..5243de630c 100644
--- a/engines/xeen/events.cpp
+++ b/engines/xeen/events.cpp
@@ -32,7 +32,7 @@
 namespace Xeen {
 
 EventsManager::EventsManager(XeenEngine *vm) : _vm(vm), _playTime(0), _gameCounter(0),
-		_frameCounter(0), _priorFrameCounterTime(0), _priorScreenRefreshTime(0),
+		_frameCounter(0), _priorFrameCounterTime(0), _priorScreenRefreshTime(0), _lastAutosaveTime(0),
 		_mousePressed(false), _sprites("mouse.icn") {
 	Common::fill(&_gameCounters[0], &_gameCounters[6], 0);
 }
@@ -69,12 +69,19 @@ void EventsManager::pollEvents() {
 		_priorScreenRefreshTime = timer;
 		g_vm->_screen->update();
 	}
+
 	if (timer >= (_priorFrameCounterTime + GAME_FRAME_TIME)) {
 		// Time to build up next game frame
 		_priorFrameCounterTime = timer;
 		nextFrame();
 	}
 
+	// Handle auto saves
+	if (!_lastAutosaveTime)
+		_lastAutosaveTime = timer;
+	g_vm->autoSaveCheck(_lastAutosaveTime);
+
+	// Event handling
 	Common::Event event;
 	while (g_system->getEventManager()->pollEvent(event)) {
 		switch (event.type) {
diff --git a/engines/xeen/events.h b/engines/xeen/events.h
index 9913b2fbf1..768e241567 100644
--- a/engines/xeen/events.h
+++ b/engines/xeen/events.h
@@ -63,6 +63,7 @@ private:
 	uint32 _frameCounter;
 	uint32 _priorFrameCounterTime;
 	uint32 _priorScreenRefreshTime;
+	int _lastAutosaveTime;
 	uint32 _gameCounter;
 	uint32 _gameCounters[6];
 	uint32 _playTime;
diff --git a/engines/xeen/saves.cpp b/engines/xeen/saves.cpp
index 82e294921b..6b88a19c8f 100644
--- a/engines/xeen/saves.cpp
+++ b/engines/xeen/saves.cpp
@@ -263,7 +263,7 @@ bool SavesManager::loadGame() {
 	delete dialog;
 
 	if (slotNum != -1) {
-		loadGameState(slotNum);
+		(void)loadGameState(slotNum);
 		g_vm->_interface->drawParty(true);
 	}
 
@@ -291,4 +291,9 @@ bool SavesManager::saveGame() {
 	}
 }
 
+void SavesManager::doAutosave() {
+	if (saveGameState(kAutoSaveSlot, _("Autosave")).getCode() != Common::kNoError)
+		g_vm->GUIError(_("Failed to autosave"));
+}
+
 } // End of namespace Xeen
diff --git a/engines/xeen/saves.h b/engines/xeen/saves.h
index 9b1bea62a3..d3352f187f 100644
--- a/engines/xeen/saves.h
+++ b/engines/xeen/saves.h
@@ -32,6 +32,10 @@
 
 namespace Xeen {
 
+enum {
+	kAutoSaveSlot = 0
+};
+
 struct XeenSavegameHeader {
 	uint8 _version;
 	Common::String _saveName;
@@ -82,6 +86,11 @@ public:
 	 */
 	Common::Error saveGameState(int slot, const Common::String &desc);
 
+	/**
+	 * Does an autosave
+	 */
+	void doAutosave();
+
 	/**
 	 * Sets up a new game
 	 */
diff --git a/engines/xeen/xeen.cpp b/engines/xeen/xeen.cpp
index 1952dc16c0..5f72623e91 100644
--- a/engines/xeen/xeen.cpp
+++ b/engines/xeen/xeen.cpp
@@ -266,7 +266,7 @@ void XeenEngine::gameLoop() {
 			// Load any pending savegame
 			int saveSlot = _loadSaveSlot;
 			_loadSaveSlot = -1;
-			_saves->loadGameState(saveSlot);
+			(void)_saves->loadGameState(saveSlot);
 			_interface->drawParty(true);
 		}
 
@@ -322,4 +322,16 @@ void XeenEngine::saveSettings() {
 	ConfMan.flushToDisk();
 }
 
+void XeenEngine::GUIError(const Common::String &msg) {
+	GUIErrorMessage(msg);
+}
+
+void XeenEngine::autoSaveCheck(int &lastSaveTime) {
+	if (shouldPerformAutoSave(lastSaveTime) && canSaveGameStateCurrently() &&
+			(_map && !(_map->mazeData()._mazeFlags & RESTRICTION_SAVE))) {
+		_saves->doAutosave();
+		lastSaveTime = g_system->getMillis();
+	}
+}
+
 } // End of namespace Xeen
diff --git a/engines/xeen/xeen.h b/engines/xeen/xeen.h
index dfe2c79eec..2ac4ee4ec6 100644
--- a/engines/xeen/xeen.h
+++ b/engines/xeen/xeen.h
@@ -149,11 +149,6 @@ private:
 	 * Plays the actual game
 	 */
 	void play();
-
-	/**
-	 * Shows a please wait dialog
-	 */
-	void pleaseWait();
 protected:
 	int _loadSaveSlot;
 protected:
@@ -275,6 +270,16 @@ public:
 	 * Saves engine settings
 	 */
 	void saveSettings();
+
+	/**
+	 * Show an error message in a GUI dialog
+	 */
+	void GUIError(const Common::String &msg);
+
+	/**
+	 * Checks if an auto save should be done, and if so, takes care of it
+	 */
+	void autoSaveCheck(int &lastSaveTime);
 };
 
 extern XeenEngine *g_vm;
-- 
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