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"""三部屋の地下道・教材1/5。Python3.11以上 / Pyxel2.9.9。"""
from dataclasses import dataclass, replace

@dataclass(frozen=True)
class Room:
    id: str
    kind: str
    depth: int
    routes: tuple
    children: tuple

# 原作Bの手作りデータ。通路は (障害文字列, 宝, 拾う道具)。
ROOMS = {
    "0": Room("0", "M", 1, (("PD", 4, "-"), ("W", 2, "-")), ("1",)),
    "1": Room("1", "D", 2, (("DD", 4, "-"), ("P", 1, "-")), ("3",)),
    "3": Room("3", "W", 3, (("WW", 4, "-"), ("D", 1, "-")), ()),
}

@dataclass(frozen=True)
class State:
    room: str = "0"
    phase: str = "route"
    hp: int = 6
    treasure: int = 0
    tick: int = 0


def initial():
    return State()


def loss(route):
    return len(route[0])


def actions(state):
    return (("route", 0), ("route", 1)) if state.phase == "route" else ()


def step(state, action):
    if (not isinstance(action, (tuple, list)) or len(action) != 2
            or action[0] != "route" or type(action[1]) is not int
            or action[1] not in (0, 1) or state.phase != "route"):
        return state
    room = ROOMS[state.room]
    route = room.routes[action[1]]
    hp = state.hp - loss(route)
    phase = "lost" if hp <= 0 else "won" if room.depth == 3 else "route"
    # 練習限定: 道具を拾わず、左の次室へ自動で進む。
    next_room = room.children[0] if phase == "route" else state.room
    return replace(state, room=next_room, phase=phase, hp=hp,
                   treasure=state.treasure + route[1], tick=state.tick + 1)


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

    def reset(self):
        self.state = initial()
        self.selection = 0
        self.gated = False
        self.message = "ONE KEY, THEN RELEASE"

    
    def control(self, pressed, held):
        # 新しく押されたRは優先。押しっぱなしのRでは初期化しない。
        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.phase in ("won", "lost"):
            return
        if self.state.phase == "route" and key in ("UP", "DOWN"):
            self.selection = 0 if key == "UP" else 1
            self.gated = True
            return
        
        if key != "Z":
            return
        before = self.state
        self.state = step(self.state, (self.state.phase, self.selection))
        self.message = "CONFIRMED" if self.state != before else "BLOCKED / NO CHANGE"
        if self.state != before:
            self.selection = 0
        self.gated = True

    def draw(self, p):
        # drawは表示のみ。状態・履歴・選択を一切変えない。
        state = self.state
        room = ROOMS[state.room]
        p.cls(1)
        p.text(12, 10, "THREE ROOMS / STAGE 1 / AUTHORED B", 10)
        p.text(12, 26, "ROOM "+room.id+" / DEPTH "+str(room.depth)+" OF 3", 7)
        p.text(12, 40, "HP "+str(state.hp)+"/6   TREASURE "+str(state.treasure)+"   PHASE "+state.phase.upper(), 7)
        for i in range(6):
            p.rect(340+i*22, 27, 16, 9, 8 if i < state.hp else 5)
        p.text(12, 56, "P/D/W: EACH LETTER COSTS 1 HP / NO EQUIPMENT", 6)
        p.text(12, 77, "CURRENT PASSAGES", 10)
        for i, route in enumerate(room.routes):
            y = 96 + i*73
            active = state.phase == "route" and self.selection == i
            p.rect(12, y, 268, 62, 2)
            p.rectb(12, y, 268, 62, 10 if active else 5)
            p.text(22, y+9, ("> " if active else "  ")+("UP" if i == 0 else "DOWN")+" : "+route[0], 10 if active else 7)
            p.text(22, y+24, "TREASURE +"+str(route[1])+"   HIT "+str(loss(route)), 7)
            p.text(22, y+42, "NO PICKUP IN THIS PRACTICE", 6)
        if state.phase == "route":
            damage = loss(room.routes[self.selection])
            p.text(12, 253, "SELECTED: HP "+str(state.hp)+" -> "+str(state.hp-damage), 11)
            p.text(12, 271, "Z: PASS, THEN AUTO LEFT", 7)
        else:
            p.text(12, 253, "RETURNED" if state.phase == "won" else "LOST / TREASURE RETAINED", 11 if state.phase == "won" else 8)
            p.text(12, 271, "R: TRY AGAIN", 7)
        p.text(306, 77, "PRACTICE: FIXED LEFT PATH", 10)
        p.text(306, 98, "ROOM 0 -> ROOM 1 -> ROOM 3", 7)
        p.text(306, 120, "NO GEAR / AUTOMATIC ROOM CHANGE", 6)
        p.text(306, 138, "P = PIT / D = DARK / W = WATER", 6)
        p.text(306, 161, "ONE OBSTACLE LETTER = ONE HIT", 7)
        p.text(306, 181, "HP 0 LOSES EVEN IN ROOM 3", 8)
        p.text(12, 320, self.message, 7)
        p.text(12, 339, "UP/DOWN + Z / R RESET / ESC QUIT", 6)
        p.text(12, 355, "TREASURE TARGETS ARE OPTIONAL. HP > 0 AT EXIT WINS.", 6)
        p.text(12, 371, "PRACTICE RULES: NO GEAR, LEFT ONLY. NOT THE FULL GAME.", 5)


CONTROL_KEYS = ("UP", "DOWN", "LEFT", "RIGHT", "Z", "X", "R")
DEMO_KEYS = ('Z',)


def main(headless=False, screenshot=None, demo=False, state_json=None):
    from pathlib import Path
    from dataclasses import asdict
    import json
    import pyxel as p  # ここだけPyxelが必要。モデルのテストは標準ライブラリのみ。
    screenshot = str(Path(screenshot).resolve()) if screenshot else None
    if screenshot:
        Path(screenshot).parent.mkdir(parents=True, exist_ok=True)
    app = App()
    p.init(600, 390, title="Three Rooms / Lesson 1", fps=30, display_scale=2, headless=headless)
    p.colors.from_list([0x090D16, 0x151D2B, 0x293441, 0x35654D, 0x674738, 0x778897, 0x85B9B5, 0xE8E1CE, 0xD96755, 0xC4884A, 0xF4C46B, 0xA8D68D, 0x4384A1, 0x8B969B, 0xD09B8C, 0xD6C5A6])
    keys = {name: getattr(p, "KEY_"+name) for name in CONTROL_KEYS}
    limit = max(12, len(DEMO_KEYS)*2+3) if demo else 12
    def update():
        if headless and p.frame_count >= limit:
            if screenshot:
                p.screenshot(screenshot, scale=2)
            if state_json:
                path = Path(state_json)
                path.parent.mkdir(parents=True, exist_ok=True)
                path.write_text(json.dumps(asdict(app.state), ensure_ascii=False, indent=2)+"\n", encoding="utf-8")
            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(description="三部屋の地下道・独立教材")
    parser.add_argument("--headless-smoke", action="store_true")
    parser.add_argument("--demo-checkpoint", action="store_true")
    parser.add_argument("--screenshot")
    parser.add_argument("--state-json")
    args = parser.parse_args()
    if (args.demo_checkpoint or args.screenshot or args.state_json) and not args.headless_smoke:
        parser.error("自動確認の出力には --headless-smoke が必要です")
    main(args.headless_smoke, args.screenshot, args.demo_checkpoint, args.state_json)