//============================================================================
//----------------------------------------------------------------------------
//									Environ.c
//----------------------------------------------------------------------------
//============================================================================


#include "PLResources.h"
#include "PLPasStr.h"
#include "DisplayDeviceManager.h"
#include "Externs.h"
#include "Environ.h"
#include "HostDisplayDriver.h"
#include "HostSystemServices.h"
#include "MenuManager.h"
#include "IGpDisplayDriver.h"
#include "WindowManager.h"

#include <algorithm>

#define	kSwitchDepthAlert		130
#define kSetMemoryAlert			180
#define kLowMemoryAlert			181
#define kWNETrap				0x60
#define	kSetDepthTrap			0xA2
#define kUnimpTrap				0x9F
#define kGestaltTrap			0xAD

#define	kDisplay9Inch			1
#define	kDisplay12Inch			2
#define	kDisplay13Inch			3

extern Boolean isAutoScale, isUseICCProfile;


typedef struct
{
	short	flags;
	long	mem1;
	long	mem2;
} sizeType;


//short GetThisVolumeRefNum (void);
//long GetThisCurrentDirectoryID (void);
//Boolean TrapExists (short);
//Boolean DoWeHaveGestalt (void);
//Boolean DoWeHaveWNE (void);
//Boolean DoWeHaveColor (void);
//Boolean DoWeHaveSystem602 (void);
//Boolean DoWeHaveSystem605 (void);
//Boolean DoWeHaveSystem7 (void);
//Boolean DoWeHaveSoundManager3 (void);
Boolean DoWeHaveQuickTime (void);
Boolean DoWeHaveDragManager (void);
//Boolean CanWeDisplay4Bit (GDHandle);
//Boolean CanWeDisplay1Bit (GDHandle);
short HowManyUsableScreens (Boolean, Boolean, Boolean);
void GetDeviceRect (Rect *);
Boolean AreWeColorOrGrayscale (void);
void SwitchDepthOrAbort (void);


macEnviron	thisMac;

extern	short		isDepthPref;
extern	Boolean		dontLoadMusic, dontLoadSounds;


//==============================================================  Functions
//--------------------------------------------------------------  GetThisVolumeRefNum
// Get a hard reference number for the current drive volume this app is on.
/*
short GetThisVolumeRefNum (void)
{
	PLError_t		theErr;
	short		vRef;

	theErr = GetVol(nil, &vRef);
	return (vRef);
}
*/
//--------------------------------------------------------------  GetThisCurrentDirectoryID
// Get a hard ID number for the current directory volume this app is in.
/*
long GetThisCurrentDirectoryID (void)
{
	long		dirID;

	dirID = LMGetCurDirStore();
	return (dirID);
}
*/
//--------------------------------------------------------------  TrapExists
// Returns whether or not a ToolBox trap exists for the users ROMs/System.
/*
Boolean TrapExists (short trapNumber)
{
	return ((NGetTrapAddress(trapNumber, ToolTrap) !=
		NGetTrapAddress(kUnimpTrap, ToolTrap)));
}
*/
//--------------------------------------------------------------  DoWeHaveGestalt

// Specifically tests for the availablity of the Gestalt() trap.
/*
Boolean DoWeHaveGestalt (void)
{
	return (TrapExists(kGestaltTrap));
}
*/
//--------------------------------------------------------------  DoWeHaveWNE

// Specifically tests for the availablity of the WaitNextEvent() trap.
/*
Boolean DoWeHaveWNE (void)
{
	return (TrapExists(kWNETrap));
}
*/
//--------------------------------------------------------------  DoWeHaveColor
// Determines if ROMs support Color QuickDraw (monitor not neccessarily color).
/*
Boolean DoWeHaveColor (void)
{
	SysEnvRec		thisWorld;

	SysEnvirons(2, &thisWorld);
	return (thisWorld.hasColorQD);
}
*/
//--------------------------------------------------------------  DoWeHaveSystem602
// Determines if the System version is at least 6.0.2 or more recent.
/*
Boolean DoWeHaveSystem602 (void)
{
	SysEnvRec		thisWorld;
	Boolean			haveIt;

	SysEnvirons(2, &thisWorld);
	if (thisWorld.systemVersion >= 0x0602)
		haveIt = true;
	else
		haveIt = false;
	return (haveIt);
}
*/
//--------------------------------------------------------------  DoWeHaveSystem605
// Determines if the System version is at least 6.0.5 or more recent.
/*
Boolean DoWeHaveSystem605 (void)
{
	SysEnvRec		thisWorld;
	Boolean			haveIt;

	SysEnvirons(2, &thisWorld);
	if (thisWorld.systemVersion >= 0x0605)
		haveIt = true;
	else
		haveIt = false;
	return (haveIt);
}
*/
//--------------------------------------------------------------  DoWeHaveSystem7

// Determines if the System version is at least 7.0.0 or more recent.
/*
Boolean DoWeHaveSystem7 (void)
{
	SysEnvRec		thisWorld;
	Boolean			haveIt;

	SysEnvirons(2, &thisWorld);
	if (thisWorld.systemVersion >= 0x0700)
		haveIt = true;
	else
		haveIt = false;
	return (haveIt);
}
*/
//--------------------------------------------------------------  DoWeHaveSoundManager3
// Determines if the Sound Manager version is at least 3.0.0 or more recent.
/*
Boolean DoWeHaveSoundManager3 (void)
{
//	NumVersion	version;
	Boolean		hasIt;

	hasIt = true;

	version = SndSoundManagerVersion();
	hasIt = (version.majorRev >= 3);

	return hasIt;
}
*/
//--------------------------------------------------------------  DoWeHaveQuickTime

Boolean DoWeHaveQuickTime (void)
{
	return true;
}

//--------------------------------------------------------------  DoWeHaveDragManager

Boolean DoWeHaveDragManager (void)
{
	return true;
}

void SwitchToDepth (short, Boolean)
{
}

//--------------------------------------------------------------  CanWeDisplay4Bit
// Determines if device (monitor) capable of supporting 4 bit (16 colors/grays).
/*
Boolean CanWeDisplay4Bit (GDHandle theDevice)
{
	short		canDepth;
	Boolean		canDo;

	canDo = false;
	canDepth = HasDepth(theDevice, 4, 1, 0);
	if (canDepth != 0)
		canDo = true;

	return (canDo);
}
*/
//--------------------------------------------------------------  CanWeDisplay1Bit
// Determines if device (monitor) capable of supporting 1 bit (black & white).
/*
Boolean CanWeDisplay1Bit (GDHandle theDevice)
{
	short		canDepth;
	Boolean		canDo;

	canDo = false;
	canDepth = HasDepth(theDevice, 1, 1, 0);
	if (canDepth != 0)
		canDo = true;

	return (canDo);
}
*/
//--------------------------------------------------------------  HowManyUsableScreens

// Counts the number of monitors that meet the depth criteria passed in.

short HowManyUsableScreens (Boolean use1Bit, Boolean use4Bit, Boolean use8Bit)
{
	return 1;
}

//--------------------------------------------------------------  FlushResolutionChange
void FlushResolutionChange(void)
{
	if (thisMac.isResolutionDirty)
	{
		GetDeviceRect(&thisMac.fullScreen);
		thisMac.constrainedScreen = thisMac.fullScreen;
		if (thisMac.constrainedScreen.Width() > kMaxViewWidth)
		{
			thisMac.constrainedScreen.left = 0;
			thisMac.constrainedScreen.right = kMaxViewWidth;
		}
		if (thisMac.constrainedScreen.Height() > kMaxViewHeight)
		{
			thisMac.constrainedScreen.top = 0;
			thisMac.constrainedScreen.bottom = kMaxViewHeight;
		}

		thisMac.gray = thisMac.fullScreen;
		thisMac.gray.top = 20;
		thisMac.isResolutionDirty = false;
	}
}

//--------------------------------------------------------------  CheckOurEnvirons
// Calls all the above functions in order to fill out a sort of "spec sheet"�
// for the current Mac.

void CheckOurEnvirons (void)
{
	thisMac.vRefNum = 0;		// TEMP
	thisMac.dirID = 0;			// TEMP
	thisMac.hasGestalt = true;	// TEMP
	thisMac.hasWNE = true;		// TEMP
	thisMac.hasColor = true;	// TEMP
	thisMac.canSwitch = true;	// TEMP
	thisMac.hasSystem7 = true;	// TEMP
	thisMac.hasSM3 = true;	// TEMP
	thisMac.hasQT = DoWeHaveQuickTime();
	thisMac.hasDrag = DoWeHaveDragManager();

	thisMac.can1Bit = true;
	thisMac.can4Bit = true;
	thisMac.can8Bit = true;
	thisMac.numScreens = HowManyUsableScreens(false, true, true);

	thisMac.isResolutionDirty = true;
	thisMac.isTouchscreen = PortabilityLayer::HostSystemServices::GetInstance()->IsTouchscreen();
	thisMac.isMouseTouchscreen = PortabilityLayer::HostSystemServices::GetInstance()->IsUsingMouseAsTouch();

	FlushResolutionChange();
}

//--------------------------------------------------------------  HandleResolutionChange
// Installs handler
void HandleResolutionChange(uint32_t prevWidth, uint32_t prevHeight, uint32_t newWidth, uint32_t newHeight)
{
	PortabilityLayer::WindowManager::GetInstance()->HandleScreenResolutionChange(prevWidth, prevHeight, newWidth, newHeight);
	PortabilityLayer::MenuManager::GetInstance()->DrawMenuBar();
	thisMac.isResolutionDirty = true;	// Because of legacy code, we don't want to update thisMac.screen immediately, but rather, let the editor or game pick it up
}

class GpAppResolutionChangeHandler final : public PortabilityLayer::DisplayDeviceManager::IResolutionChangeHandler
{
public:
	void OnResolutionChanged(uint32_t prevWidth, uint32_t prevHeight, uint32_t newWidth, uint32_t newHeight) override
	{
		HandleResolutionChange(prevWidth, prevHeight, newWidth, newHeight);
	}

	void AdjustRequestedResolution(uint32_t &physicalWidth, uint32_t &physicalHeight, uint32_t &virtualWidth, uint32_t &virtualHeight, float &pixelScaleX, float &pixelScaleY) override
	{
		if (physicalWidth < 640)
			physicalWidth = 640;

		if (physicalHeight < 480)
			physicalHeight = 480;

		double minMul = 1.0;

		if (isAutoScale)
		{
			double xMul = static_cast<double>(physicalWidth) / 640.0;
			double yMul = static_cast<double>(physicalHeight) / 480.0;

			double granularity = 2.0;

			xMul = floor(xMul * granularity) / granularity;
			yMul = floor(yMul * granularity) / granularity;

			minMul = std::max<double>(1.0, std::min(xMul, yMul));
		}

		virtualWidth = physicalWidth / minMul;
		virtualHeight = physicalHeight / minMul;
		pixelScaleX = static_cast<float>(minMul);
		pixelScaleY = static_cast<float>(minMul);
	}

	static GpAppResolutionChangeHandler ms_instance;
};

GpAppResolutionChangeHandler GpAppResolutionChangeHandler::ms_instance;

//--------------------------------------------------------------  InstallResolutionHandler
// Installs handler
void InstallResolutionHandler(void)
{
	PortabilityLayer::DisplayDeviceManager::GetInstance()->SetResolutionChangeHandler(&GpAppResolutionChangeHandler::ms_instance);
}

//--------------------------------------------------------------  ReflectMonitor2Environs
// Tests second monitor (if available) for specific bit depth capabilities.
/*
void ReflectSecondMonitorEnvirons (Boolean use1Bit, Boolean use4Bit, Boolean use8Bit)
{
	GDHandle	tempGDevice;

	tempGDevice = GetDeviceList();
	while (tempGDevice != nil)
	{
		if (TestDeviceAttribute(tempGDevice, screenDevice))
			if ((use1Bit && CanWeDisplay1Bit(tempGDevice)) ||
					(use4Bit && CanWeDisplay4Bit(tempGDevice)) ||
					(use8Bit && CanWeDisplay8Bit(tempGDevice)))
				if (!TestDeviceAttribute(tempGDevice, mainScreen))
				{
					thisGDevice = tempGDevice;
					thisMac.can1Bit = CanWeDisplay1Bit(thisGDevice);
					thisMac.can4Bit = CanWeDisplay4Bit(thisGDevice);
					thisMac.can8Bit = CanWeDisplay8Bit(thisGDevice);
					thisMac.wasDepth = WhatsOurDepth();
					thisMac.wasColorOrGray = AreWeColorOrGrayscale();
					GetDeviceRect(&thisMac.screen);
					break;
				}
		tempGDevice = GetNextDevice(tempGDevice);
	}
}
*/
//--------------------------------------------------------------  HandleDepthSwitching

// Handles setting up a monitor's depth to play on.

void HandleDepthSwitching (void)
{
	switch (isDepthPref)
	{
	case 32:
		PortabilityLayer::DisplayDeviceManager::GetInstance()->SetPixelFormat(GpPixelFormats::kRGB32);
		break;
	case 8:
		PortabilityLayer::DisplayDeviceManager::GetInstance()->SetPixelFormat(GpPixelFormats::k8BitStandard);
		break;
	default:
		isDepthPref = 8;
		PortabilityLayer::DisplayDeviceManager::GetInstance()->SetPixelFormat(GpPixelFormats::k8BitStandard);
		break;
	}

	thisMac.isDepth = isDepthPref;

	PortabilityLayer::HostDisplayDriver::GetInstance()->SetUseICCProfile(isUseICCProfile != 0);
}

void GetDeviceRect(Rect *rect)
{
	unsigned int width;
	unsigned int height;
	PortabilityLayer::HostDisplayDriver::GetInstance()->GetDisplayResolution(&width, &height);

	SetRect(rect, 0, 0, static_cast<short>(width), static_cast<short>(height));
}

Boolean AreWeColorOrGrayscale()
{
	// ... As opposed to B&W
	return true;
}

void SwitchDepthOrAbort(void)
{
}