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# Copyright (c) 2026 Pyxel 100 contributors
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"""屋上菜園・教材2/5。独立して動く朝と夕方の模型。"""
from dataclasses import dataclass, replace

START_POTS = (2, 0, -1, -1, -1, -1)
WEATHER = ("W", "W", "W", "W")


@dataclass(frozen=True)
class State:
    day: int = 0
    pots: tuple = START_POTS

def shadows(state):
    if state.day >= len(WEATHER) or WEATHER[state.day] == "C":
        return frozenset()
    dx = 1 if WEATHER[state.day] == "W" else -1
    # index%3は列番号。影を次の行へ回り込ませない。
    return frozenset(i+dx for i, value in enumerate(state.pots)
                     if value >= 2 and 0 <= i%3+dx < 3)

def forecast(state):
    if state.day >= len(WEATHER) or WEATHER[state.day] == "C":
        return state.pots
    shade = shadows(state)
    return tuple(value+1 if 0 <= value < 3 and i not in shade else value
                 for i, value in enumerate(state.pots))


def step(state, action):
    if action == "W":
        if state.day >= len(WEATHER):
            return state
        return replace(state, day=state.day+1, pots=forecast(state))
    return state

class App:
    def __init__(self):
        self.reset()

    def reset(self):
        self.state = State()
        self.selected = 0
        self.locked = False
        self.message = "SPACE: EVENING GROWTH"

    def control(self, pressed, held):
        if self.locked:
            if not held:
                self.locked = False
            return
        if "R" in pressed:
            self.reset()
            self.locked = True
            return
        if len(pressed) != 1:
            return
        key = next(iter(pressed))
        x, y = self.selected%3, self.selected//3
        if key in ("LEFT", "RIGHT", "UP", "DOWN"):
            x = max(0, min(2, x+(key=="RIGHT")-(key=="LEFT")))
            y = max(0, min(1, y+(key=="DOWN")-(key=="UP")))
            self.selected = y*3+x
            self.locked = True
            return
        action = "W" if key == "SPACE" else None
        if action is None:
            return
        before = self.state
        self.state = step(self.state, action)
        self.message = ("EVENING / NEXT MORNING" if action=="W" else "CARE / SAME MORNING") if self.state!=before else "NO CHANGE"
        self.locked = True

    def draw(self, p):
        p.cls(1)
        p.text(8, 8, "ROOFTOP GARDEN / STAGE 2", 10)
        weather = WEATHER[self.state.day] if self.state.day < len(WEATHER) else "END"
        p.text(8, 22, "MORNING "+str(self.state.day)+" / "+str(len(WEATHER))+"  SUN "+weather, 7)
        shade = shadows(self.state)
        following = forecast(self.state)
        for i, value in enumerate(self.state.pots):
            x, y = 12+(i%3)*100, 64+(i//3)*58
            p.rectb(x, y, 92, 53, 10 if i==self.selected else 5)
            p.text(x+4, y+4, "POT "+str(i+1), 7)
            if i in shade:
                p.text(x+48, y+4, "SHADE", 6)
            p.rect(x+30, y+33, 24, 12, 4)
            if value >= 0:
                p.line(x+42, y+32, x+42, y+24-3*value, 3)
                if value == 0:
                    p.circ(x+42, y+30, 2, 10)
                elif value == 1:
                    p.circ(x+37, y+27, 3, 11)
                elif value == 2:
                    p.circ(x+35, y+24, 6, 3)
                    p.circ(x+49, y+21, 6, 11)
                else:
                    p.circ(x+36, y+19, 4, 9)
                    p.circ(x+47, y+22, 4, 10)
            p.text(x+4, y+42, str(value)+" -> "+str(following[i]), 7)
        p.text(8, 188, "-1 EMPTY  0 SEED  1 YOUNG  2 LEAF  3 POD", 6)
        p.text(8, 200, "ARROW IS EVENING FORECAST, NOT EXTRA GROWTH", 6)
        p.text(8, 216, self.message, 10)
        p.text(8, 230, 'SPACE GROW', 7)
        p.text(8, 241, "R RESET  ESC QUIT", 6)

DEMO_KEYS = ('SPACE',)

def main(headless=False, screenshot=None, demo=False):
    from pathlib import Path
    import pyxel as p
    screenshot = str(Path(screenshot).resolve()) if screenshot else None
    if screenshot:
        Path(screenshot).parent.mkdir(parents=True, exist_ok=True)
    app = App()
    p.init(320, 256, title="Rooftop Garden", fps=30, display_scale=3, headless=headless)
    keys = {k: getattr(p, "KEY_"+k) for k in ("UP", "DOWN", "LEFT", "RIGHT", "SPACE", "Z", "C", "X", "R")}
    limit = max(12, 2*len(DEMO_KEYS)+3) if demo else 12

    def update():
        if headless and p.frame_count >= limit:
            if screenshot:
                p.screenshot(screenshot, scale=3)
            p.quit()
            return
        if headless and demo:
            index = p.frame_count//2
            pressed = {DEMO_KEYS[index]} if p.frame_count%2==0 and index<len(DEMO_KEYS) else set()
            app.control(pressed, pressed)
        else:
            app.control({k for k,v in keys.items() if p.btnp(v)}, {k for k,v in keys.items() if p.btn(v)})
    p.run(update, lambda: app.draw(p))
    return app


if __name__ == "__main__":
    import argparse
    parser = argparse.ArgumentParser()
    parser.add_argument("--headless-smoke", action="store_true")
    parser.add_argument("--demo-checkpoint", action="store_true")
    parser.add_argument("--screenshot")
    args = parser.parse_args()
    main(args.headless_smoke, args.screenshot, args.demo_checkpoint)