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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1995-1997 Presto Studios, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef PEGASUS_AI_AIAREA_H
+#define PEGASUS_AI_AIAREA_H
+
+#include "pegasus/input.h"
+#include "pegasus/movie.h"
+#include "pegasus/timers.h"
+#include "pegasus/ai/ai_rule.h"
+
+namespace Common {
+	class ReadStream;
+	class WriteStream;
+}
+
+/*
+
+	The AI area is the area at the bottom of the screen. There are three areas within
+	the AI area:
+	1)	the inventory/AI help area
+	2)	the middle area
+	3)	the biochip display area
+	
+	Area 1 is used for displaying the current inventory item. When the player changes the
+	current item, either by selecting a new one in the inventory list or by picking
+	up a new item, area 1 updates to show the new item.
+	
+	If the AI decides to give a message, the AI's head temporarily takes over area 1
+	for the duration of the message, then goes away, returning the area to the current
+	inventory item.
+	
+	Area 2 is used to display the current inventory item's state, the current biochip's
+	state, and any extra information from the AI. The contention for this area is
+	resolved as follows:
+	--	If the AI needs to use the area while giving a message in area 1, it takes over
+		area 2 for the duration of its message.
+*** This is not true.
+	--	If the player selects a new inventory item, the inventory item's state gets
+		displayed immediately.
+	--	If the player selects a new biochip, the biochip's state info gets displayed
+		immediately.
+	--	If any auto drawing is to occur, it seizes the area as soon as the drawing is
+		to occur. For example, the mapping biochip does auto drawing every time the
+		player takes a step. The only exception to this rule is if the AI is presenting
+		a warning. When the AI seizes areas 1 and 2, it preempts all other uses.
+	Some inventory items and biochips can cause arbitrary drawing to occur in this area
+	at arbitrary times. The map biochip is one example which causes drawing when the
+	player takes a step. Another example is the poison gas canister, which flashes in
+	this area to indicate a dangerous compound.
+	
+	Area 3 is used to display the current biochip. When the player changes the current
+	biochip, either by selecting a new one from the biochip list or by picking up a
+	new one, area 3 updates to show the new item. In addition, some biochips can play
+	animation in this area.
+
+*/
+
+namespace Pegasus {
+
+class AIArea : public Surface, public Idler, public InputHandler {
+public:
+	AIArea(InputHandler *);
+	virtual ~AIArea();
+
+	void writeAIRules(Common::WriteStream *stream);
+	void readAIRules(Common::ReadStream *stream);
+
+	void initAIArea();
+
+	void saveAIState();
+	void restoreAIState();
+	
+	void handleInput(const Input &, const Hotspot *);
+	void activateHotspots();
+	void clickInHotspot(const Input &, const Hotspot *);
+	
+	void setAIVolume(const uint16);
+	
+	// There are only so many legal combinations of client/area.
+	// Here is the list of supported pairs:
+	//      kInventorySignature     kLeftAreaSignature
+	//      kInventorySignature     kMiddleAreaSignature
+	//      kBiochipSignature       kMiddleAreaSignature
+	//      kBiochipSignature       kRightAreaSignature
+	//      kAISignature            kLeftAreaSignature
+	// Further, the kAISignature never sets a static frame time in the left area,
+	// but only plays a sequence from the AI movie.
+	void setAIAreaToTime(const LowerClientSignature, const LowerAreaSignature, const TimeValue);
+	
+	// The "Play" functions play the requested sequence synchronously.
+	void playAIAreaSequence(const LowerClientSignature, const LowerAreaSignature, const TimeValue, const TimeValue);
+
+	// For PlayAIMovie, it is assumed that the client is the AI itself.
+	// This is used to play AI messages as well as Optical Memory video.
+	// Returns true if the movie played all the way through, false if it was interrupted.
+	bool playAIMovie(const LowerAreaSignature, const Common::String &movieName, bool keepLastFrame, const InputBits);
+
+	// Loop the requested sequence indefinitely.
+	void loopAIAreaSequence(const LowerClientSignature, const LowerAreaSignature, const TimeValue, const TimeValue);
+
+	void addAIRule(AIRule *);
+
+	// Remove and delete all rules.
+	void removeAllRules();
+
+	void lockAIOut();
+	void unlockAI();
+	void forceAIUnlocked();
+
+	void checkMiddleArea();
+	void checkRules();
+
+	LowerClientSignature getMiddleAreaOwner();
+	void toggleMiddleAreaOwner();
+
+	TimeValue getBigInfoTime();
+	void getSmallInfoSegment(TimeValue &, TimeValue &);
+
+protected:	
+	void useIdleTime();
+
+	void setLeftMovieTime(const TimeValue);
+	void setMiddleMovieTime(const LowerClientSignature, const TimeValue);
+	void setRightMovieTime(const TimeValue);
+
+	Movie _leftAreaMovie;
+	Movie _middleAreaMovie;
+	Movie _rightAreaMovie;
+	Movie _AIMovie;
+
+	LowerClientSignature _leftAreaOwner;
+	LowerClientSignature _middleAreaOwner;
+	LowerClientSignature _rightAreaOwner;
+
+	TimeValue _leftInventoryTime;
+	TimeValue _middleInventoryTime;
+	TimeValue _middleBiochipTime;
+	TimeValue _rightBiochipTime;
+
+	AIRuleList _AIRules;
+
+	uint _lockCount;
+};
+
+extern AIArea *g_AIArea;
+
+} // End of namespace Pegasus
+
+#endif