/*
 * Top Level FPGA Module
 *
 * by Brendan Doms, Sean McBride, Brian Shih, and Mikell Taylor
 * 		(Olin College - Computer Architecture - Fall 2005)
 * 
 */

// Top level of what's inside our VGA on the spartan

`include "hardware_sprite.v"
`include "vga.v"

module FPGA (Clk50, Reset, buttonUP, buttonDOWN, buttonLEFT, buttonRIGHT, R, G, B, HSync, VSync);

	input Clk50, Reset, buttonUP, buttonDOWN, buttonLEFT, buttonRIGHT;
	output R, G, B, HSync, VSync;

	reg [9:0] posx, posx1, posx2, posx3, posx4;
	reg [8:0] posy, posy1, posy2, posy3, posy4;
	
	reg [18:0] movecounter;
	
	wire PClk, Row0, Col0, Active, A;
	wire [9:0] Col;
	wire [8:0] Row;

	// VGA timing module
	vga vga0( Reset, VSync, HSync, Clk50, PClk, Row, Col, Row0, Col0, Active );
	
	// User controlled sprite
	wire R0, G0, B0, A0, tR0, tG0, tB0; 
	video_selector vs0 (R, G, B, tR0, tG0, tB0, R0, G0, B0, A0);
	hardware_sprite hwsp0 (Reset, R0, G0, B0, A0, Clk50, PClk, Row, Col, Active, posx, posy, 0, 0, 0);
	
	// "Computer" controlled sprite
	wire R1, G1, B1, A1, tR1, tG1, tB1;
	video_selector vs1 (tR0, tG0, tB0, tR1, tG1, tB1, R1, G1, B1, A1);
	hardware_sprite hwsp1 (Reset, R1, G1, B1, A1, Clk50, PClk, Row, Col, Active, posx1, posy1, 0, 0, 1);
	wire R2, G2, B2, A2, tR2, tG2, tB2; 
	video_selector vs2 (tR1, tG1, tB1, tR2, tG2, tB2, R2, G2, B2, A2);
	hardware_sprite hwsp2 (Reset, R2, G2, B2, A2, Clk50, PClk, Row, Col, Active, posx2, posy2, 0, 0, 1);
	wire R3, G3, B3, A3, tR3, tG3, tB3; 
	video_selector vs3 (tR2, tG2, tB2, tR3, tG3, tB3, R3, G3, B3, A3);
	hardware_sprite hwsp3 (Reset, R3, G3, B3, A3, Clk50, PClk, Row, Col, Active, posx3, posy3, 0, 0, 1);
	wire R4, G4, B4, A4; 
	video_selector vs4 (tR3, tG3, tB3, 0, 0, 0, R4, G4, B4, A4);
	hardware_sprite hwsp4 (Reset, R4, G4, B4, A4, Clk50, PClk, Row, Col, Active, posx4, posy4, 0, 0, 1);
	
	
	always @(posedge Clk50) begin
		if (Reset) begin
			// Initialize Values
			posx = 10'd320;
			posy = 9'd240;
			posx1 = 10'd50;
			posy1 = 9'd50;
			posx2 = 10'd590;
			posy2 = 9'd430;
			posx3 = 10'd50;
			posy3 = 9'd430;
			posx4 = 10'd590;
			posy4 = 9'd50;
		end
		else begin
			movecounter = movecounter + 1;
			if (movecounter == 0) begin
				if (buttonUP)
					posy = posy - 4;
				if (buttonDOWN)
					posy = posy + 4;
				if (buttonLEFT)
					posx = posx - 4;
				if (buttonRIGHT)
					posx = posx + 4;

				// Make ghosts chase you
				if (posx1 > posx)
					posx1 = posx1 - 3;
				if (posx1 < posx)
					posx1 = posx1 + 3;
				if (posy1 > posy)
					posy1 = posy1 - 3;
				if (posy1 < posy)
					posy1 = posy1 + 3;
				
				if (posx2 > posx)
					posx2 = posx2 - 2;
				if (posx2< posx)
					posx2 = posx2 + 2;
				if (posy2 > posy)
					posy2 = posy2 - 2;
				if (posy2 < posy)
					posy2 = posy2 + 2;
				
				if (posx3 > posx)
					posx3 = posx3 - 1;
				if (posx3 < posx)
					posx3 = posx3 + 1;
				if (posy3 > posy)
					posy3 = posy3 - 1;
				if (posy3 < posy)
					posy3 = posy3 + 1;
				
				if (posx4 > posx)
					posx4 = posx4 - 2;
				if (posx4 < posx)
					posx4 = posx4 + 1;
				if (posy4 > posy)
					posy4 = posy4 - 3;
				if (posy4 < posy)
					posy4 = posy4 + 1;
			end
		end
	end
	


endmodule