#include <stdlib.h>

#include <stdio.h>

#include "myLib.h"

#include "game.h"

#include "startscreen.h"

#include "ghost.h"

#include "gameover.h"

#include "text.h"

static int distance;

float upCount;

int goingUp;

int acceleration;

int speed;

/* Current state of the game: TITLE, NORMAL, GAMEOVER */

int state;

char buffer[50];

//declaration of general variables

WALL topWall[NUM_RECS];

WALL bottomWall[NUM_RECS];

WALL middleWall[3];

WALL oldMidWall[3];

WALL oldTopWall[NUM_RECS];

WALL oldBottomWall[NUM_RECS];

GARY gary;

GARY oldGary;

//prepares the game for the start

void initiate() {

state = TITLE;

drawImage3(0, 0, 240, 160, startscreen);

goingUp = 0;

acceleration = 1;

distance = 0;

upCount = 0;

for (int i = 0; i < NUM_RECS; i++) {

topWall[i].color = RED;

topWall[i].width = RECWIDTH;

topWall[i].height = RECHEIGHT;

topWall[i].xPos = RECWIDTH * i;

topWall[i].yPos = 0;

}

for (int i = 0; i < NUM_RECS; i++) {

bottomWall[i].color = RED;

bottomWall[i].width = RECWIDTH;

bottomWall[i].height = RECHEIGHT;

bottomWall[i].xPos = RECWIDTH * i;

bottomWall[i].yPos = 140;

}

middleWall[0].color = RED;

middleWall[0].width = RECWIDTH;

middleWall[0].height = RECHEIGHT;

middleWall[0].xPos = 20;

middleWall[0].yPos = randomMidHeight();

middleWall[1].color = RED;

middleWall[1].width = RECWIDTH;

middleWall[1].height = RECHEIGHT;

middleWall[1].xPos = 120;

middleWall[1].yPos = randomMidHeight();

middleWall[2].color = RED;

middleWall[2].width = RECWIDTH;

middleWall[2].height = RECHEIGHT;

middleWall[2].xPos = 200;

middleWall[2].yPos = randomMidHeight();

gary.xPos = 50;

gary.yPos = 60;

gary.height = 21;

gary.width = 15;

gary.image = ghost;

}

/*

* Changes the game state and draws the gameover image.

*/

void endGame() {

state = GAMEOVER;

speed = 2;

drawImage3(0, 0, GAMEOVER_WIDTH, GAMEOVER_HEIGHT, gameover);

}

/*

* draws the initial layour of the game

*/

void startGame() {

state = NORMAL;

u16 bgcolor = BLACK;

DMA[3].src = &bgcolor;

DMA[3].dst = videoBuffer;

DMA[3].cnt = 38400 | DMA_ON | DMA_SOURCE_FIXED;

for (int i = 0; i < NUM_RECS; i++) {

drawRect3(topWall[i].yPos, topWall[i].xPos, topWall[i].width, topWall[i].height, topWall[i].color);

drawRect3(bottomWall[i].yPos, bottomWall[i].xPos, bottomWall[i].width, bottomWall[i].height, bottomWall[i].color);

}

}

//this method creates random heights for the bottom and top walls

int randomMidHeight() {

int max = 1000;

int min = 0;

for (int x = 0; x < NUM_RECS; x++) {

if(topWall[x].yPos > min)

min = topWall[x].yPos;

if (bottomWall[x].yPos < max)

max = bottomWall[x].yPos;

}

min += RECHEIGHT;

max -= (RECHEIGHT + min);

int answer = min + (int)((rand() / (float)RAND_MAX) * max);

return answer;

}

//updates the middle blocks in the middle by constantly moving them

void updateMiddle() {

middleWall[0].xPos -= 4;

middleWall[1].xPos -= 4;

middleWall[2].xPos -= 4;

if(middleWall[0].xPos < 0) {

middleWall[0].xPos = 240;

middleWall[0].yPos = randomMidHeight();

}

if(middleWall[1].xPos < 0) {

middleWall[1].xPos = 240;

middleWall[1].yPos = randomMidHeight();

}

if(middleWall[2].xPos < 0) {

middleWall[2].xPos = 240;

middleWall[2].yPos = randomMidHeight();

}

}

//updates the bottom and top walls and shifts them to the left

void updateBarriers() {

for (int i = 0; i < (NUM_RECS - 1); i++)

{

topWall[i].xPos = RECWIDTH * i;

topWall[i].yPos = topWall[i+1].yPos;

bottomWall[i].xPos = RECWIDTH * i;

bottomWall[i].yPos = bottomWall[i+1].yPos;

}

lastRec();

}

//makes it so the last rectangle can't be off the screen

void lastRec() {

if(topWall[22].yPos < 2)

moveDown();

else if(bottomWall[22].yPos > 158)

moveUp();

else {

if((int)((rand() / (float)RAND_MAX) * 2) == 1)

moveUp();

else

moveDown();

}

}

//moves the walls down

void moveDown() {

topWall[NUM_RECS - 1].xPos = RECWIDTH * (NUM_RECS - 1);

topWall[NUM_RECS - 1].yPos += 1;

bottomWall[NUM_RECS - 1].xPos = RECWIDTH * (NUM_RECS - 1);

bottomWall[NUM_RECS - 1].yPos += 1;

}

//moves the walls up

void moveUp() {

topWall[NUM_RECS - 1].xPos = RECWIDTH * (NUM_RECS - 1);

topWall[NUM_RECS - 1].yPos -= 1;

bottomWall[NUM_RECS - 1].xPos = RECWIDTH * (NUM_RECS - 1);

bottomWall[NUM_RECS - 1].yPos -= 1;

}

/*

*

* @ destination_row: the row on the screen that the animation will begin at

* @ destination_col: the column on the screen that the animation will begin at

*/

void animator(int theRow, int theCol)

{

for (int i = 0; i < 4; i++)

{

WaitForVblank();

draw_image_portion(theRow,theCol,0, i*15, 15, 21, ghost, GHOST_WIDTH);

}

}

//checks to see if gary the ghost was hit and then returns either a zero or one

int isHit() {

for(int x = 4; x <= 7; x++)

if(gary.xPos + 21 >= bottomWall[x].yPos)

return 1;

for(int y = 4; y <= 7; y++)

if(gary.xPos <= topWall[y].yPos + RECHEIGHT)

return 1;

for(int z = 0; z <= 3; z++)

if(isInMidRange(z))

return 1;

return 0;

}

//checks to see if gary has collided with anything

int isInMidRange(int n) {

if(gary.yPos <= (middleWall[n].xPos + middleWall[n].width) &&//editited this

(gary.yPos + gary.width) >= middleWall[n].xPos &&

gary.xPos <= (middleWall[n].yPos + middleWall[n].height) &&

(gary.xPos + gary.height) >= middleWall[n].yPos)

return 1;

return 0;

}

//updates gary the ghost to move about

void updateGary() {

speed += acceleration;

gary.xPos += speed;

if(isHit())

endGame();

}

//makes Gary jump!

void jump() {

speed = -6;

}

//calls all the updates and then checks for user button presses and draws everything to the screen.

void runGame() {

if(state == GAMEOVER) {

return;

}

oldGary = gary;

updateGary();

oldMidWall[0] = middleWall[0];

oldMidWall[1] = middleWall[1];

oldMidWall[2] = middleWall[2];

updateMiddle();

for (int i = 0; i < 3; i++) {

drawRect3(oldMidWall[i].yPos, oldMidWall[i].xPos, oldMidWall[i].width, oldMidWall[i].height, BLACK);

drawRect3(middleWall[i].yPos, middleWall[i].xPos, middleWall[i].width, middleWall[i].height, middleWall[i].color);

}

for (int i = 0; i < NUM_RECS; i++)

{

oldTopWall[i] = topWall[i];

oldBottomWall[i] = bottomWall[i];

}

updateBarriers();

for (int i = 0; i < NUM_RECS; i++) {

drawRect3(oldBottomWall[i].yPos, bottomWall[i].xPos, bottomWall[i].width, bottomWall[i].height, BLACK);

}

for (int i = 0; i < NUM_RECS; i++) {

drawRect3(bottomWall[i].yPos, bottomWall[i].xPos, bottomWall[i].width, bottomWall[i].height, bottomWall[i].color);

}

for (int i = 0; i < NUM_RECS; i++) {

drawRect3(oldTopWall[i].yPos, topWall[i].xPos, topWall[i].width, topWall[i].height, BLACK);

}

for (int i = 0; i < NUM_RECS; i++) {

drawRect3(topWall[i].yPos, topWall[i].xPos, topWall[i].width, topWall[i].height, topWall[i].color);

}

distance += 1;

sprintf(buffer, "Distance: %d", distance);

drawString(150, 5, buffer, WHITE);

drawRect3(0,0,240,20,RED);

drawRect3(oldGary.xPos, oldGary.yPos, 15, 21, BLACK);

animator(gary.xPos, gary.yPos);

if(isHit())

endGame();

}