/* 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.
 *
 * 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 MYST_SAVELOAD_H
#define MYST_SAVELOAD_H

#include "common/savefile.h"
#include "common/file.h"
#include "common/str.h"

#include "engines/savestate.h"

namespace Common {
class Serializer;
}

namespace Mohawk {

class MohawkEngine_Myst;

struct MystSaveMetadata {
	uint8 saveDay;
	uint8 saveMonth;
	uint16 saveYear;

	uint8 saveHour;
	uint8 saveMinute;

	uint32 totalPlayTime;

	bool autoSave;

	Common::String saveDescription;

	MystSaveMetadata();
	bool sync(Common::Serializer &s);
};

// Page being held
enum HeldPage {
	kNoPage              = 0,
	kBlueLibraryPage     = 1,
	kBlueSeleniticPage   = 2,
	kBlueMechanicalPage  = 3,
	kBlueStoneshipPage   = 4,
	kBlueChannelwoodPage = 5,
	kBlueFirePlacePage   = 6,
	kRedLibraryPage      = 7,
	kRedSeleniticPage    = 8,
	kRedMechanicalPage   = 9,
	kRedStoneshipPage    = 10,
	kRedChannelwoodPage  = 11,
	kRedFirePlacePage    = 12,
	kWhitePage           = 13
};

// Age the player is in
enum ActiveAge {
	kSelenitic     = 0,
	kStoneship     = 1,
	kMystLibrary   = 2,
	kMechanical    = 3,
	kChannelwood   = 4,
	kIntro         = 5,
	kDni           = 6,
	kMystStart     = 7,
	kCredits       = 8,
	kSirrusEnding  = 9,
	kAchenarEnding = 10
};

// Various states that Atrus can be in when in Dni
enum DniEnding {
	kDniNotVisited    = 0, // Player hasn't been to Dni/K'veer yet
	kAtrusWantsPage   = 1, // Player is in Dni with the white page
	kAtrusLeaves      = 2, // Atrus leaves Dni after receiving the white page
	kForgotPage       = 3, // Player has entered Dni without bringing the white page
	kBooksDestroyed   = 4  // Atrus returns to Dni after previously leaving 
						   // and destroying the books of his sons
};

class MystGameState {
public:
	static const int kAutoSaveSlot;

	MystGameState(MohawkEngine_Myst*, Common::SaveFileManager*);
	~MystGameState();

	static SaveStateDescriptor querySaveMetaInfos(int slot);
	static Common::String querySaveDescription(int slot);

	void reset();
	bool load(int slot);
	bool save(int slot, const Common::String &desc, const Graphics::Surface *thumbnail, bool autosave);
	static void deleteSave(int slot);

	void addZipDest(MystStack stack, uint16 view);
	bool isReachableZipDest(MystStack stack, uint16 view);

	/* 8 Game Global Variables :
	   0 = Unknown - Fixed at 2
	   1 = Current Age / Stack
	   2 = Page Being Held
	   3 = Unknown - Fixed at 1
	   4 = Slide Transitions
	   5 = Ending
	   6 = Red Pages in Book
	   7 = Blue Pages in Book
	*/
	struct Globals {
		uint16 u0;
		ActiveAge currentAge;
		HeldPage heldPage;
		uint16 u1;
		uint16 transitions; // Unused in ScummVM
		uint16 zipMode;     // Unused in ScummVM
		uint16 redPagesInBook;
		uint16 bluePagesInBook;
		DniEnding ending;
	} _globals;

	/* 50 Myst Specific Variables :
	   0  = Marker Switch Near Cabin
	   1  = Marker Switch Near Clock Tower
	   2  = Marker Switch on Dock
	   3  = Marker Switch Near Ship Pool
	   4  = Marker Switch Near Gears
	   5  = Marker Switch Near Generator Room
	   6  = Marker Switch Near Stellar Observatory
	   7  = Marker Switch Near Rocket Ship
	   8  = Fireplace, Opened Green Book Before
	   9  = Ship State
	   10 = Cabin Gas Valve Position
	   11 = Clock Tower Hour Hand Position
	   12 = Clock Tower Minute Hand Position
	   13 = Clock Tower Puzzle Solved / Gears Open
	   14 = Clock Tower Gear Bridge
	   15 = Generator Breaker State
	   16 = Generator Button State
	   17 = Generator Voltage State
	   18 = Library Bookcase Door
	   19 = Dock Imager Numeric Selection
	   20 = Dock Imager Active
	   21 = Unknown #1 - Fixed at 0
	   22 = Unknown #2 - Fixed at 0
	   23 = Unknown #3 - Fixed at 0
	   24 = Unknown #4 - Fixed at 0
	   25 = Tower Rotation Angle
	   26 = Boxes For Ship Float Puzzle
	   27 = Tree Boiler Pilot Light Lit
	   28 = Stellar Observatory Viewer, Control Setting Day
	   29 = Stellar Observatory Lights
	   30 = Stellar Observatory Viewer, Control Setting Month
	   31 = Stellar Observatory Viewer, Control Setting Time
	   32 = Stellar Observatory Viewer, Control Setting Year
	   33 = Stellar Observatory Viewer, Target Day
	   34 = Stellar Observatory Viewer, Target Month
	   35 = Stellar Observatory Viewer, Target Time
	   36 = Stellar Observatory Viewer, Target Year
 	   37 = Cabin Safe Combination
	   38 = Channelwood Tree Position
	   39 = Checksum? #1
	   40 = Checksum? #2
	   41 = Rocketship Music Puzzle Slider #1 Position
	   42 = Rocketship Music Puzzle Slider #2 Position
	   43 = Rocketship Music Puzzle Slider #3 Position
	   44 = Rocketship Music Puzzle Slider #4 Position
	   45 = Rocketship Music Puzzle Slider #5 Position
	   46 = Unknown #5
	   47 = Unknown #6
	   48 = Unknown #7
	   49 = Unknown #8
	*/
	struct Myst {
		uint32 cabinMarkerSwitch;
		uint32 clockTowerMarkerSwitch;
		uint32 dockMarkerSwitch;
		uint32 poolMarkerSwitch;
		uint32 gearsMarkerSwitch;
		uint32 generatorMarkerSwitch;
		uint32 observatoryMarkerSwitch;
		uint32 rocketshipMarkerSwitch;
		uint16 greenBookOpenedBefore;
		uint16 shipFloating;
		uint16 cabinValvePosition;
		uint16 clockTowerHourPosition;
		uint16 clockTowerMinutePosition;
		uint16 gearsOpen;
		uint16 clockTowerBridgeOpen;
		uint16 generatorBreakers;
		uint16 generatorButtons;
		uint16 generatorVoltage;
		uint16 libraryBookcaseDoor;
		uint16 imagerSelection;
		uint16 imagerActive;
		uint16 imagerWaterErased;
		uint16 imagerMountainErased;
		uint16 imagerAtrusErased;
		uint16 imagerMarkerErased;
		uint16 towerRotationAngle;
		uint16 courtyardImageBoxes;
		uint16 cabinPilotLightLit;
		uint16 observatoryDaySetting;
		uint16 observatoryLights;
		uint16 observatoryMonthSetting;
		uint16 observatoryTimeSetting;
		uint16 observatoryYearSetting;
		uint16 observatoryDayTarget;
		uint16 observatoryMonthTarget;
		uint16 observatoryTimeTarget;
		uint16 observatoryYearTarget;
		uint16 cabinSafeCombination;
		uint16 treePosition;
		uint32 treeLastMoveTime;
		uint16 rocketSliderPosition[5];
		uint16 observatoryDaySlider;
		uint16 observatoryMonthSlider;
		uint16 observatoryYearSlider;
		uint16 observatoryTimeSlider;
	} _myst;

	/* 7 Channelwood Specific Variables :
	    0 = Water Pump Bridge State
	    1 = Lower Walkway to Upper Walkway Elevator State
	    2 = Lower Walkway to Upper Walkway Spiral Stair Lower Door State
	    3 = Extendable Pipe State
	    4 = Water Valve States
	    5 = Achenar's Holoprojector Selection
	    6 = Lower Walkway to Upper Walkway Spiral Stair Upper Door State
	*/
	struct Channelwood {
		uint32 waterPumpBridgeState;
		uint32 elevatorState;
		uint32 stairsLowerDoorState;
		uint32 pipeState;
		uint16 waterValveStates;
		uint16 holoprojectorSelection;
		uint16 stairsUpperDoorState;
	} _channelwood;

	/* 8 Mech Specific Variables :
	    0 = Achenar's Room Secret Panel State
	    1 = Sirrus' Room Secret Panel State
	    2 = Fortress Staircase State
	    3 = Fortress Elevator Rotation
	    4 = Code Lock Shape #1 (Left)
	    5 = Code Lock Shape #2
	    6 = Code Lock Shape #3
	    7 = Code Lock Shape #4 (Right)
	*/
	struct Mechanical {
		uint32 achenarCrateOpened;
		uint16 achenarPanelState;
		uint16 sirrusPanelState;
		uint16 staircaseState;
		uint16 elevatorRotation;
		uint16 codeShape[4];
	} _mechanical;

	/* 18 Selenitic Specific Variables :
	    0 = Sound Pickup At Water Pool
	    1 = Sound Pickup At Volcanic Crack
	    2 = Sound Pickup At Clock
	    3 = Sound Pickup At Crystal Rocks
	    4 = Sound Pickup At Windy Tunnel
	    5 = Sound Receiver Doors
	    6 = Windy Tunnel Lights
	    7 = Sound Receiver Current Input
	    8 = Sound Receiver Input #0 (Water Pool) Angle Value
	    9 = Sound Receiver Input #1 (Volcanic Crack) Angle Value
	   10 = Sound Receiver Input #2 (Clock) Angle Value
	   11 = Sound Receiver Input #3 (Crystal Rocks) Angle Value
	   12 = Sound Receiver Input #4 (Windy Tunnel) Angle Value
	   13 = Sound Lock Slider #1 (Left) Position
	   14 = Sound Lock Slider #2 Position
	   15 = Sound Lock Slider #3 Position
	   16 = Sound Lock Slider #4 Position
	   17 = Sound Lock Slider #5 (Right) Position
	*/
	struct Selenitic {
		uint32 emitterEnabledWater;
		uint32 emitterEnabledVolcano;
		uint32 emitterEnabledClock;
		uint32 emitterEnabledCrystal;
		uint32 emitterEnabledWind;
		uint32 soundReceiverOpened;
		uint32 tunnelLightsSwitchedOn;
		uint16 soundReceiverCurrentSource;
		uint16 soundReceiverPositions[5];
		uint16 soundLockSliderPositions[5];
	} _selenitic;

	/* 14 Stoneship Specific Variables :
	    0 = Light State
	    1 = Secret side door opened
	    2 = Water Pump State
	    3 = Lighthouse Trapdoor State
	    4 = Lighthouse Chest Water State
	    5 = Lighthouse Chest Valve State
	    6 = Lighthouse Chest Open State
	    7 = Lighthouse Trapdoor Key State
	    8 = Lighthouse Battery Duration
	    9 = Lighthouse Battery Power Good
	   10 = Lighthouse Battery Depletion Time
	*/
	struct Stoneship {
		uint32 lightState;
		uint16 sideDoorOpened;
		uint16 pumpState;
		uint16 trapdoorState;
		uint16 chestWaterState;
		uint16 chestValveState;
		uint16 chestOpenState;
		uint16 trapdoorKeyState;
		uint32 generatorDuration;
		uint16 generatorPowerAvailable;
		uint32 generatorDepletionTime;
	} _stoneship;

	MystSaveMetadata _metadata;

private:
	void syncGameState(Common::Serializer &s, bool isME);
	static Common::String buildSaveFilename(int slot);
	static Common::String buildMetadataFilename(int slot);
	bool loadState(int slot);
	void loadMetadata(int slot);
	bool saveState(int slot);
	void updateMetadateForSaving(const Common::String &desc, bool autoSave);
	bool saveMetadata(int slot, const Graphics::Surface *thumbnail);

	// The values in these regions are lists of VIEW resources
	// which correspond to visited zip destinations

	typedef uint16 ZipDests[41];

	ZipDests _mystReachableZipDests;

	ZipDests _channelwoodReachableZipDests;

	ZipDests _mechReachableZipDests;

	ZipDests _seleniticReachableZipDests;

	ZipDests _stoneshipReachableZipDests;

	MohawkEngine_Myst *_vm;
	Common::SaveFileManager *_saveFileMan;
};

} // End of namespace Mohawk

#endif