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/*ブロック崩しの作り方　中間ソース３*/
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#include "DxLib.h"

#define BALL_SIZE 5
#define BALL_SPEED 5
#define BAR_SPEED 5
#define BAR_WIDTH 50
#define BAR_HEIGHT 10
#define FIELD_WIDTH 300
#define FIELD_HEIGHT 480
#define X_POSI 170

void my_init_variable(void);
void my_gameover(void);
void my_move_bar(void);
void my_move_ball(void);
void my_collision_detection(void);
void my_draw_ball(void);
void my_draw_bar(void);
void my_draw_field(void);
int my_get_key(void);

int game_state;
int bar_x;
int bar_y;
int ball_x;
int ball_y;
int x_speed;
int y_speed;
int Color_White;
int Color_Red;

int key[256];

int WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int){
	ChangeWindowMode(TRUE);
	DxLib_Init();
	SetDrawScreen(DX_SCREEN_BACK);

	my_init_variable();

	while (ScreenFlip()==0 && ProcessMessage()==0
		 && ClearDrawScreen()==0 && my_get_key()==0){

		switch(game_state){
		case 0:
			game_state = 5;
			break;
		case 5:
			my_move_bar();
			my_move_ball();
			my_collision_detection();
			my_draw_ball();
			my_draw_bar();
			my_draw_field();	
			break;
		case 10:
			my_draw_bar();
			my_draw_field();
			my_gameover();
			break;
		default:
			break;
		}
	}
	DxLib_End();
	return 0;
}

void my_init_variable(){
	game_state = 0;
	bar_x = 0;
	bar_y = FIELD_HEIGHT - BAR_HEIGHT;
	ball_x = BAR_WIDTH / 2;
	ball_y = (FIELD_HEIGHT - BAR_HEIGHT) - BALL_SIZE;
	x_speed = BALL_SPEED;
	y_speed = BALL_SPEED;
	Color_White = GetColor(255,255,255);
	Color_Red = GetColor(255,0,0);
}

void my_gameover(){
	DrawFormatString(280,240,Color_White,"GAME OVER");
}

void my_move_ball(){
	ball_x += x_speed;
	ball_y += y_speed;
}

void my_move_bar(){
	if (key[KEY_INPUT_RIGHT] > 0 && (bar_x + BAR_WIDTH) < FIELD_WIDTH){
		bar_x += BAR_SPEED;
	}
	if (key[KEY_INPUT_LEFT] > 0 && bar_x > 0){
		bar_x -= BAR_SPEED;
	}
}

void my_collision_detection(){
	if(ball_x >= FIELD_WIDTH){
		ball_x = FIELD_WIDTH - BALL_SIZE;
		x_speed *= -1;
	}
	if(ball_x <= 0){
		ball_x = BALL_SIZE;
		x_speed *= -1;
	}
	if(ball_y <= 0){
		ball_y = BALL_SIZE;
		y_speed *= -1;
	}
	if(ball_y >= FIELD_HEIGHT){
		game_state = 10;
	}
	if (ball_x > bar_x && ball_x < (bar_x + BAR_WIDTH) && ball_y >= bar_y){
		ball_y = bar_y - BALL_SIZE;
		y_speed *= -1;
	}
}

void my_draw_ball(){
	DrawCircle(X_POSI + ball_x,ball_y,BALL_SIZE,Color_White,false);
}

void my_draw_bar(){
	DrawBox(X_POSI + bar_x,bar_y,X_POSI + bar_x + BAR_WIDTH,bar_y + BAR_HEIGHT,Color_Red,true);
}

void my_draw_field(){
	DrawBox(X_POSI + 0,0,X_POSI + FIELD_WIDTH,FIELD_HEIGHT,Color_White,false);
}

int my_get_key(){
	char keys[256];
	GetHitKeyStateAll(keys);
	for (int i = 0; i < 256; i++){
		if (keys[i] != 0){
			key[i]++;
		}
		else{
			key[i] = 0;
		}
	}
	return 0;
}
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