package main

import "core:fmt"
import "core:os"
import "core:strings"

WIDTH :: 32
HEIGHT :: 32
AREA :: WIDTH * HEIGHT

main :: proc() {
	fmt.println("hellope")
	board : [AREA]bool = ---

	// board[0] = true
	// board[1] = true
	// board[WIDTH] = true
	// for x in 4..<14 {
	// 	board[x + WIDTH*8] = true
	// }
	for {
		print_board(&board)
		bytes := 0
		err : os.Errno
		buf : [3]byte
		for {
			bytes, err = os.read(os.stdin, buf[:])
			if bytes > 0 do break
		}
		update_board(&board)
	}
}

print_board :: proc(state: ^[AREA]bool){
	fmt.println(strings.repeat("-", WIDTH))
	for y := 0; y < HEIGHT; y += 2{
		for x in 0..<WIDTH{
			top := state[x + y * WIDTH]
			bot := state[x + (y+1) * WIDTH ]
			if top {
				if bot{
					fmt.print("█")
				}else{
					fmt.print("▀")
				}
			}else{
				if bot {
					fmt.print("▄")
				}else{
					fmt.print(" ")
				}
			}
		}
		fmt.println()
	}
	fmt.println()
}


update_board :: proc(state: ^[AREA]bool){
	new_state : [AREA]bool = ---
	for x in 0..<WIDTH {
		for y in 0..<HEIGHT {
			count := 0
			for dx in -1..=1 {
				px := (x + dx + WIDTH) % WIDTH
				for dy in -1..=1 {
					py := (y + dy + HEIGHT) % HEIGHT
						if state[px + py * WIDTH]{
							count += 1
						}
					}
				}
				cell := state[x + y * WIDTH];
				new_cell := (count == 3 && !cell) || (cell && count < 5 && count > 2)
				// fmt.println("count %v, state %v", count, new_cell)
				new_state[x + y * WIDTH] = new_cell
		}
	}
	for i in 0..<AREA {
		state[i] = new_state[i]
	}
}