#include "all.c"

#define MEM_SIZE (1<<24)
#define GRIDWIDTH 20
#define GRIDHEIGHT 16
#define TICK_LENGTH 200

typedef struct {
	unsigned char r, g, b, a;
} Color;

typedef struct {
	int x, y, w, h;
	Color fill;
	Color border;
} DrawElement;

typedef struct {
	int len;
	DrawElement els[2 * GRIDWIDTH * GRIDHEIGHT * 4];
} DrawList;

typedef struct {
	char *start;
	char *end;
} Arena;

enum {
	EMPTY,
	BLACK,
	RED,
	YELLOW,
	RED_UP,
	RED_DOWN,
	RED_LEFT,
	RED_RIGHT,
	BLUE,
	BLUE_UP,
	BLUE_DOWN,
	BLUE_LEFT,
	BLUE_RIGHT,
	N_COLORS,
};

typedef struct {
	int width, height;
} UI;

typedef struct {
	uint64_t lastTick;
	char playing;
	int grid[GRIDWIDTH * GRIDHEIGHT];
	int goalx, goaly;
} State;

// Mirror these in src/index.html.in
enum {
	INPUT_NONE,
	INPUT_CLICK,
	INPUT_RCLICK,
	INPUT_PAUSE_PLAY,
};

typedef struct {
	State state;
	UI ui;
	int input;
	int mousex, mousey;
} Game;

#define new(a, c, t) ((t *) alloc(a, c, sizeof(t), _Alignof(t)))
#define affirm(c) while (!(c)) *(volatile int *)0 = 0

static void xmemcpy(void *dst, void *src, ptrdiff_t size) {
	for (ptrdiff_t i = 0; i < size; i++) {
		((char *) dst)[i] = ((char *) src)[i];
	}
}

static void *alloc(Arena *a, ptrdiff_t count, ptrdiff_t size, ptrdiff_t align) {
	ptrdiff_t pad = -(size_t) a->start & (align - 1);
	affirm(count < (a->end - a->start - pad) / size);
	char *r = a->start + pad;
	a->start += pad + size * count;
	for (ptrdiff_t i = 0; i < count * size; i++) {
		r[i] = 0;
	}

	return r;
}