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#include "DarkGDK.h"
//include string functionallity
#include <string.h>

//Constant Declarations

//Matrix Constants
const int TheGround = 1;
const int width = 5000;
const int depth = 5000;

//Images
const int grass = 1;
const int clouds = 2;
const int RedCross = 3;

//Object Constants
const int crosshair = 1;
const int sky = 2;
const int gun = 3;
const int healthbar = 4;
const int enemy = 6;
const int PlayerBullet = 20;

//animation constants
const int IdleStart = 0;
const int IdleStop = 24;
const int ImpactStart = 25;
const int ImpactStop = 34;
const int AttackStart = 35;
const int AttackStop = 59;
const int DieStart = 60;
const int DieStop = 109;

//sound constants
const int PlayerGun = 1;
const int BodyHit = 2;
const int scream = 3;

//bullet constants
const int BulletStep = 20;
const int BulletRange = 1000;

//Function Prototypes
void SetUpScreen();
void LoadImages();
void CreateMatrix();
void LoadObjects();
void LoadSounds();
void MoveCamera(float &,float &, float, float &, float &);
void DisplayEnemyHealth(int);
void ControlPlayerBullet(int &, int &, int &, int &, int &);
void CheckForHit(int &, int &, int &, int &);
void ResetPlayerBullet(int &, int &);


// the main entry point for the application is this function
void DarkGDK ( void )
{
	//declare camera movement variables
	float CamXAng = 0, CamYAng = 0, CamZAng = 0;
	float xPos = 2200, zPos = 2000;
	//player health variable
	int health = 100;
	//declare player bullet variables
	int BulletLive = 0;
	int ObjectHit = 0;
	int DistanceTravelled = 0;
	int ammo = 200;
	int EnemyHealth = 5;
	int EnemyFacing = 0;

	//call our user defined functions
	SetUpScreen();
    LoadImages();
    CreateMatrix();
    LoadObjects();
	LoadSounds();

	//position camera in the center of the landscape
	dbPositionCamera(xPos,25,zPos);
	dbPointCamera(2300,25,12300);

	// our main loop
	while ( LoopGDK ( ) )
	{
		//get new camera position
		MoveCamera(CamXAng,CamYAng,CamZAng,xPos,zPos);
		//slowly rotate the sky
		dbYRotateObject(sky,dbObjectAngleY(sky)+0.05);

		DisplayEnemyHealth(EnemyHealth);
		ControlPlayerBullet(ammo, BulletLive, DistanceTravelled, ObjectHit, EnemyHealth);

		//if enemy alive and not playing animation, play idle animation
		if(EnemyHealth>0 && dbObjectPlaying(enemy)==0)
		{
			dbSetObjectSpeed(enemy,10);
			dbLoopObject(enemy,IdleStart,IdleStop);
		}//end if

		//update the screen
		dbSync();
	}//end while

	// and now everything is ready to return back to Windows
	return;
}

//===============================
//*   Function Declarations     *
//===============================

void SetUpScreen()
{
	//turn on sync rate and set maximum to 60 fps
	dbSetDisplayMode(800,600,32);
	dbSetWindowPosition(50,50);
    dbHideMouse();
	dbSetTextFont("Tahoma");
	dbSetTextSize(20);
	dbInk(dbRGB(255,255,255),0);
	//display loading message
	dbCenterText(dbScreenWidth()/2,dbScreenHeight()/2, " Loading Scene....");
	dbSync();
	dbSyncOn();
	dbSyncRate(60);
	dbSetTextSize(16);
}//end function set up screen

void LoadImages()
{
	dbLoadImage("grass08.bmp",grass);
	dbLoadImage("Bsky_2.bmp",clouds);
	dbLoadImage("CrossHair.bmp",RedCross);
}//end function load images

void LoadObjects()
{
	//create, texture, position and rotate sky
	dbMakeObjectSphere(sky,-5500);
	dbPositionObject(sky,2500,-10,2500);
	dbTextureObject(sky,clouds);
	dbXRotateObject(sky,180);
	dbYRotateObject(sky,180);
	dbFixObjectPivot(sky);
	//turn ambient lighting off for sky
	dbSetObjectAmbient(sky,0);

	//create and texture a plain object for the crosshair
	dbMakeObjectPlain(crosshair,10,10);
	dbPositionObject(crosshair,0,0,100);
	dbTextureObject(crosshair,RedCross);

	//keep the crosshair locked to the screen
	dbLockObjectOn(crosshair);
	//make the crosshair transparent - black pixels not drawn
	dbSetObjectTransparency(crosshair,1);

	//load,scale and position lock on gun object
	dbLoadObject("mp5\\H-mp5-static.x",gun);
	dbScaleObject(gun,5000,5000,5000);
	dbPositionObject(gun,10,-13,20);
	dbLockObjectOn(gun);

	//load,scale and position enemy object
	dbLoadObject("thug\\L-thug-Idle.x",enemy);
	dbAppendObject("thug\\L-thug-Impact.x",enemy,ImpactStart);
	dbAppendObject("thug\\L-thug-Attack1.x",enemy,AttackStart);
	dbAppendObject("thug\\L-thug-Die.x",enemy,DieStart);
	dbPositionObject(enemy,2225,0,2500);
	//scale thug to 17* its original size
	dbScaleObject(enemy,1700,1700,1700);
    //set the animation play speed
	dbSetObjectSpeed(enemy,10);
	dbLoopObject(enemy,IdleStart,IdleStop);

	//make bullet object
	dbMakeObjectSphere(PlayerBullet,1);
	dbColorObject(PlayerBullet,dbRGB(0,0,0));
	dbHideObject(PlayerBullet);

	//ambient light affects the amount of shadowing on 3d objects
	dbSetAmbientLight(30);

	//set initial camera position
	dbSetCameraRange(1,6000);
}//end function load objects

void CreateMatrix()
{
	//make matrix 5000*5000 pixels and 20*20 tiles
	dbMakeMatrix(TheGround,width,depth,20,20);
	//texture with grass
	dbPrepareMatrixTexture(TheGround,grass,1,1);
	dbSetMatrix(TheGround,0,0,1,2,1,0,1);
	dbPositionMatrix(TheGround,0,0,0);
	dbUpdateMatrix(TheGround);
}//end function create matrix

void MoveCamera( float &CamXAng, float &CamYAng, float CamZAng, float &xPos, float &zPos)
{
	//declare char pointer to hold player input from dbInKey()
	char * pKeyPress;

	//fix mouse pointer to center of screen
	dbPositionMouse(dbScreenWidth()/2,dbScreenHeight()/2);

	//use the mouse to alter the camera angles, divide by 3 to decrease movement
	CamXAng = CamXAng+(dbMouseMoveY()/3);
	CamYAng = CamYAng+(dbMouseMoveX()/3);

	//restrict "Head" movement to +/- 45 degrees
	if(CamXAng>0 && CamXAng>45)
	{
		CamXAng = 45;
	}//end if

	if(CamXAng<0 && CamXAng<-45)
	{
		CamXAng = -45;
	}//end if

	//rotate camera to new position
	dbRotateCamera(CamXAng,CamYAng,CamZAng);

	//use dbInKey() to get which key user has pressed
	pKeyPress = dbInKey();

	//move forward if "w" pressed
	if(strcmp(pKeyPress,"w")==0)
	{
		xPos = dbNewXValue(xPos,CamYAng,1);
		zPos = dbNewZValue(zPos,CamYAng,1);
	}//end if

	//move backward if "s" pressed
	if(strcmp(pKeyPress,"s")==0)
	{
		xPos = dbNewXValue(xPos,CamYAng,-1);
		zPos = dbNewZValue(zPos,CamYAng,-1);
	}//end if

	//straffe (move 90 degrees) left if "a" is pressed
	if(strcmp(pKeyPress,"a")==0)
	{
		//get new x and z positions based on y angle
		xPos = dbNewXValue(xPos,CamYAng-90,0.5);
		zPos = dbNewZValue(zPos,CamYAng-90,0.5);
	}//end if

		//straffe (move 90 degrees) right if "d" is pressed
	if(strcmp(pKeyPress,"d")==0)
	{
		//get new x and z positions based on y angle
		xPos = dbNewXValue(xPos,CamYAng+90,0.5);
		zPos = dbNewZValue(zPos,CamYAng+90,0.5);
	}//end if

	//use updated x and z values to position camera
	dbPositionCamera(xPos,25,zPos);
}//end function move camera

void LoadSounds()
{
	dbLoadSound("Sounds\\machinegun.wav",PlayerGun);
	dbSetSoundVolume(PlayerGun,85);
	dbLoadSound("Sounds\\uh.wav",BodyHit);
	dbSetSoundVolume(BodyHit,96);
	dbLoadSound("Sounds\\scream1.wav",scream);
	dbSetSoundVolume(scream,80);
}//end function load sounds

void DisplayEnemyHealth(int EnemyHealth)
{
	char EnemyHealthStr[30]="Enemy Health: ";
	strcat(EnemyHealthStr,dbStr(EnemyHealth));
	dbInk(dbRGB(255,255,255),0);
	dbText(50,20,EnemyHealthStr);
}//end function display enemy health

void ControlPlayerBullet(int &ammo, int &BulletLive, int &DistanceTravelled, int &ObjectHit, int &EnemyHealth)
{
	if(ammo>0)   //if player has ammo
	{
		//if left mouse click and no live bullet position and rotate bullet object to camera
		//set bullet live to 1 and dec ammo by 1
		if(dbMouseClick()==1 && BulletLive==0)
		{
			dbPositionObject(PlayerBullet,dbCameraPositionX(),dbCameraPositionY(),dbCameraPositionZ());
			dbSetObjectToCameraOrientation(PlayerBullet);
			dbShowObject(PlayerBullet);
			BulletLive = 1;
			ammo -= 1;

			if(dbSoundPlaying(PlayerGun)==0);
			{//if gun fire sound is not playing then play it
				dbPlaySound(PlayerGun);
			}//end if
		}//end if

		if(BulletLive==1)
		{//if bullet alive move 29 units
			DistanceTravelled += BulletStep;
			if(DistanceTravelled<BulletRange)
			{
				dbMoveObject(PlayerBullet,BulletStep);
				CheckForHit(ObjectHit, EnemyHealth, DistanceTravelled, BulletLive);
			}
			else
			{
				ResetPlayerBullet(BulletLive, DistanceTravelled);
				ObjectHit = 0;
			}//end else
		}//end if
	}//end if
	else
	{
		dbText(50,40,"No ammo left");
	}//end else
}//end function control player bullet

void CheckForHit(int &ObjectHit, int &EnemyHealth, int &DistanceTravelled, int &BulletLive)
{
	if(dbObjectPositionY(PlayerBullet)<0)
	{//if bullet "hits" the ground
		ResetPlayerBullet(BulletLive, DistanceTravelled);
		ObjectHit = 1;
	}//end if

	if(dbObjectCollision(PlayerBullet,0)>2)
	{// if any object hit by bullet
		ObjectHit = dbObjectCollision(PlayerBullet,0);
		if(ObjectHit==enemy && EnemyHealth>0)
		{//if object hit is enemy and has been hit <5 times
			//play impact animation and sound, decrement health
			dbPlayObject(enemy, ImpactStart, ImpactStop);
			dbPlaySound(BodyHit);
			EnemyHealth -= 1;
			if(EnemyHealth<=0)
			{// if enemy has no health remaining, play die animation and sound
				dbSetObjectSpeed(enemy,55);
				dbPlayObject(enemy, DieStart, DieStop);
				dbPlaySound(scream);
			}//end if
		}//end if
		ResetPlayerBullet(BulletLive, DistanceTravelled);
	}//end if
}//end function check for hit

void ResetPlayerBullet(int &BulletLive, int &DistanceTravelled)
{
	dbHideObject(PlayerBullet);
	BulletLive = 0;
	DistanceTravelled = 0;
}//end function reset player bullet