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"""風まかせ郵便気球・教材2/5。原作Aの有限航路。"""
from dataclasses import dataclass, replace

WINDS = ((-1,-1,1,1),(0,1,0,-1),(2,2,-2,-2))
START = 1

@dataclass(frozen=True)
class State:
    t: int = 0
    x: int = START
    h: int = 1
    outcome: str = "flying"


def initial():
    return State()


def step(state, action):
    if state.outcome != "flying":
        return state, "end"
    if action not in ("up","down","stay"):
        return state, "invalid"
    h = state.h+{"up":1,"down":-1,"stay":0}[action]
    if not 0<=h<=2:
        return state, "height"
    wind = WINDS[h][state.t%len(WINDS[0])]
    x = state.x+wind
    return State(state.t+1,x,h,"flying" if 0<=x<=12 else "drift"), "ok"

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

    def reset(self):
        self.state = initial()
        self.gated = False
        self.message = "READY"

    def control(self, pressed, held):
        if "R" in pressed:
            self.reset()
            self.gated = True
            return
        if self.gated:
            if not pressed and not held:
                self.gated = False
            return
        if len(pressed | held)>1:
            self.gated = True
            self.message = "RELEASE ALL KEYS"
            return
        if len(pressed)!=1:
            return
        key = next(iter(pressed))
        if self.state.outcome!="flying":
            return
        action = {"UP":"up","DOWN":"down","RIGHT":"stay"}.get(key)
        if action is None:
            return
        self.state,self.message = step(self.state,action)
        self.gated = True

    def draw(self, p):
        p.cls(1)
        p.text(8,8,"WIND POST / STAGE 2",10)
        s = self.state
        p.text(8,23,"T "+str(s.t)+"  X "+str(s.x)+"  H "+str(s.h)+"  "+s.outcome.upper(),7)
        for h in range(3):
            y = 150-h*36
            p.line(40,y,400,y,5)
            p.text(8,y-3,"H"+str(h),6)
        for x in range(13):
            p.text(39+x*30,165,str(x),6)
        if 0<=s.x<=12:
            x=40+s.x*30;y=150-s.h*36
            p.circ(x,y-9,5,10)
            p.line(x,y-4,x,y,7)
            p.rect(x-2,y,5,3,9)
        phase=s.t%len(WINDS[0])
        p.text(8,199,"WIND BY TURN COLUMN / NOW "+str(phase),7)
        for h in range(3):
            p.text(8,214+h*14,"H"+str(h),6)
            for col,wind in enumerate(WINDS[h]):
                x=38+col*45
                if col==phase:p.rectb(x-2,211+h*14,30,11,10)
                p.text(x,214+h*14,format(wind,"+d"),7)
        preview_actions = (('UP', 'up'), ('RIGHT', 'stay'), ('DOWN', 'down'))
        for row,(key,action) in enumerate(preview_actions):
            after,reason=step(s,action)
            text=key+": X"+str(after.x)+" H"+str(after.h)+" T"+str(after.t)
            if hasattr(after,"fuel"):text+=" F"+str(after.fuel)
            if after==s:text=key+": "+reason.upper()
            p.text(235,214+row*14,text,11 if after!=s else 6)
        p.text(8,263,self.message.upper(),7)
        p.text(8,280,"UP / DOWN CHANGE LAYER  RIGHT STAY  R RESET",6)
        p.text(8,306,"ESC QUIT",6)

DEMO_KEYS = ('UP', 'RIGHT', 'DOWN', 'DOWN')
KEYS = ("UP","DOWN","RIGHT","Z","SPACE","C","X","R")


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(448,320,title="Wind Post",fps=30,display_scale=2,headless=headless)
    keys={k:getattr(p,"KEY_"+k) for k in KEYS}
    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=2)
            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))


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)