/*********************************************************************
 *
 * main.c
 *
 ********************************************************************/

#include "myLib.h"
#include "background1.h"
#include "background2.h"
#include "lightning.h"
#include <stdio.h>

#define SPRITEOFFSET16(r,c) (r)*32+(c)
#define SPRITEOFFSET256(r,c) (r)*16+(c)
#define MASKCOL (0x1FF)
#define MASKROW (0xFF)
#define MAXWIDTH 239
#define MAXHEIGHT 159

#define BG1 1
#define BG2 2

int state;

int main(void)
{
	int state = BG1;
    int voff = 0;	// These two variables store our values for vertical
    int hoff = 0;	// and horizontal offset. During vblank we will
					// store these values into the appropriate hardware
					// register
	   /*****************************************************************
		 *
		 *  Step 4 -- Store Tile Images
		 *
		 ****************************************************************/
		 DMA[3].src = background1Tiles;
		 DMA[3].dst = CHARBLOCKBASE;
		 DMA[3].cnt = background1TilesLen | DMA_ON;
		/*****************************************************************
		 *
		 *  Step 5 -- Store map
		 *
		 ****************************************************************/
		 DMA[3].src = background1Map;
		 DMA[3].dst = SCREENBLOCKBASE + 27;
		 DMA[3].cnt = background1MapLen | DMA_ON;

		/*****************************************************************
		 *
		 *  Step 6 -- Store palette
		 *
		 ****************************************************************/
		 DMA[3].src = background1Pal;
		 DMA[3].dst = PALETTE;
		 DMA[3].cnt = background1PalLen | DMA_ON;

		/*****************************************************************
		 *
		 *  Step 7 -- Set image controls
		 *
		 ****************************************************************/
		 REG_DISPCTL = MODE0 | BG0_ENABLE | OBJ_ENABLE;
		 REG_BG0HOFS = 0;
		 REG_BG0VOFS = 0;

		 DMA[3].src = lightningTiles;
		 DMA[3].dst = &CHARBLOCKBASE[4];
		 DMA[3].cnt = lightningTilesLen/2 | DMA_ON;

		 DMA[3].src = lightningPal;
		 DMA[3].dst = SPRITEPAL;
		 DMA[3].cnt = 256 | DMA_ON;

		 ObjAttr shadowOAM[128];

		 int spriteCol= 40;
		 int spriteRow = (160-48);

		 int i;

		 int direction = 1;

		 for(i=0; i<128; i++)
		 {
			 shadowOAM[i].attr0 = ATTR0_HIDE;
		 }

		 shadowOAM[0].attr0 = spriteRow | ATTR0_TALL | ATTR0_REG | ATTR0_4BPP;
		 shadowOAM[0].attr1 = spriteCol | ATTR1_SIZE64 | ATTR1_NOFLIP;
		 //shadowOAM[0].attr2 = SPRITEOFFSET16(0,0) | ATTR2_PALETTE_BANK

		 REG_BG0CNT = BG_SIZE0 | SBB(27) | COLOR256 | CBB(0);

    while(1)
    {
    	switch(state)
    	{
    	case BG1:
			{

				if(KEY_DOWN_NOW(BUTTON_LEFT)){
					hoff--;
					spriteCol--;
					direction = -1;
				}
				if(KEY_DOWN_NOW(BUTTON_RIGHT)){
					hoff++;
					spriteCol++;
					direction = 1;
				}
				if(KEY_DOWN_NOW(BUTTON_UP)){
					voff--;
					if (voff < 0){
						voff = 0;
					}
				}
				if(KEY_DOWN_NOW(BUTTON_DOWN)){
					voff++;
					if (voff > 256-MAXHEIGHT){
						voff = 256-MAXHEIGHT;
					}
				}
				waitForVblank();
				REG_BG0HOFS = hoff;
				REG_BG0VOFS = voff;

				if(KEY_DOWN_NOW(BUTTON_START))
				{
					/*****************************************************************
					 *
					 *  Step 4 -- Store Tile Images
					 *
					 ****************************************************************/
					 DMA[3].src = background2Tiles;
					 DMA[3].dst = CHARBLOCKBASE;
					 DMA[3].cnt = background2TilesLen | DMA_ON;
					/*****************************************************************
					 *
					 *  Step 5 -- Store map
					 *
					 ****************************************************************/
					 DMA[3].src = background2Map;
					 DMA[3].dst = SCREENBLOCKBASE + 27;
					 DMA[3].cnt = background2MapLen | DMA_ON;

					/*****************************************************************
					 *
					 *  Step 6 -- Store palette
					 *
					 ****************************************************************/
					 DMA[3].src = background2Pal;
					 DMA[3].dst = PALETTE;
					 DMA[3].cnt = background2PalLen | DMA_ON;

					/*****************************************************************
					 *
					 *  Step 7 -- Set image controls
					 *
					 ****************************************************************/
					REG_DISPCTL = MODE0 | BG0_ENABLE;
					REG_BG0HOFS = 0;
					REG_BG0VOFS = 0;

					REG_BG0CNT = BG_SIZE0 | SBB(27) | COLOR256 | CBB(0);
					state = BG2;
				}

		 break;
	}

		 case BG2:
		 {
			 if(KEY_DOWN_NOW(BUTTON_LEFT)){
				hoff--;
				//if (hoff <= 0){
					//hoff = 0;
				//}
			}
			if(KEY_DOWN_NOW(BUTTON_RIGHT)){
				hoff++;
				//if (hoff > 256-MAXWIDTH){
					//hoff = 256-MAXWIDTH;
				//}
			}
			if(KEY_DOWN_NOW(BUTTON_UP)){
				voff--;
				if (voff < 0){
					voff = 0;
				}
			}
			if(KEY_DOWN_NOW(BUTTON_DOWN)){
				voff++;
				if (voff > 256-MAXHEIGHT){
					voff = 256-MAXHEIGHT;
				}
			}
			waitForVblank();
			REG_BG0HOFS = hoff;
			REG_BG0VOFS = voff;

			if(KEY_DOWN_NOW(BUTTON_START))
			{
				/*****************************************************************
				 *
				 *  Step 4 -- Store Tile Images
				 *
				 ****************************************************************/
				 DMA[3].src = background1Tiles;
				 DMA[3].dst = CHARBLOCKBASE;
				 DMA[3].cnt = background1TilesLen | DMA_ON;
				/*****************************************************************
				 *
				 *  Step 5 -- Store map
				 *
				 ****************************************************************/
				 DMA[3].src = background1Map;
				 DMA[3].dst = SCREENBLOCKBASE + 27;
				 DMA[3].cnt = background1MapLen | DMA_ON;

				/*****************************************************************
				 *
				 *  Step 6 -- Store palette
				 *
				 ****************************************************************/
				 DMA[3].src = background1Pal;
				 DMA[3].dst = PALETTE;
				 DMA[3].cnt = background1PalLen | DMA_ON;

				/*****************************************************************
				 *
				 *  Step 7 -- Set image controls
				 *
				 ****************************************************************/
				 REG_DISPCTL = MODE0 | BG0_ENABLE;
				 REG_BG0HOFS = 0;
				 REG_BG0VOFS = 0;

				 REG_BG0CNT = BG_SIZE0 | SBB(27) | COLOR256 | CBB(0);

				state = BG1;
			}

		break;
		}
    }

	if(KEY_DOWN_NOW(BUTTON_LEFT)){
		hoff--;
		spriteCol--;
		direction = -1;
	}
	if(KEY_DOWN_NOW(BUTTON_RIGHT)){
		hoff++;
		spriteCol++;
		direction = 1;
	}
	if(KEY_DOWN_NOW(BUTTON_UP)){
		voff--;
		if (voff < 0){
			voff = 0;
		}
	}
	if(KEY_DOWN_NOW(BUTTON_DOWN)){
		voff++;
		if (voff > 256-MAXHEIGHT){
			voff = 256-MAXHEIGHT;
		}
	}
	waitForVblank();
	REG_BG0HOFS = hoff;
	REG_BG0VOFS = voff;

    }

	return 0;
}