from st3m.reactor import Responder
from st3m.run import run_responder

UP    = 0
LEFT  = 1
DOWN  = 2
RIGHT = 3

def dir_str(dir):
    if dir == UP:
        return 'back'
    elif dir == LEFT:
        return 'left'
    elif dir == DOWN:
        return 'front'
    elif dir == RIGHT:
        return 'right'

def image_path(dir, step):
    return f"/flash/sprites/{dir_str(dir)}{str(step + 1)}.png"


class Random:
    def __init__(self):
        self._state = 0x9ec5_9ec5 # (two gecs)

    # idk its fine its just for choosing delay and direction
    def next(self):
        self._state *= 37
        self._state &= 0xffff_ffff
        return self._state >> 24

    def direction(self):
        return self.next() & 3

    def delay(self):
        return Box.TURN_DELAY_BASE + self.next()

# screen coords range ±120 each side

class Box(Responder):
    STEP_DELAY = 250
    TURN_DELAY_BASE = 1400

    def __init__(self):
        self.random = Random()
        self.choose_direction()
        self.choose_turn_delay()
        self.step = 0
        self.step_delay = Box.STEP_DELAY

    def draw(self, ctx):
        self.clear(ctx)
        # self.text(ctx)
        self.image(ctx)

    def clear(self, ctx):
        ctx.rgb(0, 0, 0) \
           .rectangle(-120, -120, 240, 240) \
           .fill()

    def image(self, ctx):
        path = image_path(self.direction, self.step)
        ctx.image(path, -10, -10, -1, -1)

    @staticmethod
    def coord(d):
        if d == UP:
            return (-20, -100)
        elif d == LEFT:
            return (-100, -20)
        elif d == RIGHT:
            return (100, 20)
        elif d == DOWN:
            return (20, 100)

    def rect(self, ctx):
        if self.step:
            ctx = ctx.rgb(.1, .6, .3)
        else:
            ctx = ctx.rgb(.1, .3, .6)
        ctx.rectangle(0, 0, *Box.coord(self.direction)).fill()

    def text(self, ctx):
        msg = f"{self.turn_delay}; {self.step_delay}; {self.direction}; {self.step}"
        ctx.font_size = 16.0
        ctx.text_align = ctx.CENTER
        ctx.rgb(1, 1, 1).move_to(0, -100).text(msg)

    def think(self, state, Δ):
        self.update_delay(Δ)

    def update_delay(self, Δ):
        self.turn_delay -= Δ
        self.step_delay -= Δ
        if self.turn_delay <= 0:
            old_delay = self.turn_delay
            self.choose_direction()
            self.choose_turn_delay(old_delay)
        if self.step_delay <= 0:
            self.step_delay = Box.STEP_DELAY
            self.step = (self.step + 1) & 3

    def choose_direction(self):
        self.direction = self.random.direction()

    def choose_turn_delay(self, subtract=0):
        self.turn_delay = self.random.delay() - subtract

run_responder(Box())