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# Copyright (c) 2026
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"""地下商人の帰還・教材2/5。ゲーム内の金額は架空の規則です。"""
from dataclasses import dataclass, replace

KINDS = ('C', 'M', 'O')  # 晶石、きのこ、鉄鉱
BASE = ((2, 2, 2), (2, 3, 3))
TOOLS = {'C': 'L', 'M': 'K', 'O': 'T'}  # 灯、冷石、磁石
BONUS = ((4, 0, 0), (0, 2, 2))
START_CARGO = ('C1', 'L1', 'M1', 'K1')


@dataclass(frozen=True)
class State:
    cargo: tuple = START_CARGO
    coins: int = 0
    sold: tuple = ()


def valid_slot(slot):
    return type(slot) is int and 0 <= slot < 4


def enhanced(cargo, slot):
    if not valid_slot(slot) or not cargo[slot] or cargo[slot][0] not in TOOLS:
        return False
    tool = TOOLS[cargo[slot][0]]
    # 端を越えない。anyなので左右に道具があっても一度だけ加算。
    return any(0 <= other < 4 and cargo[other] and cargo[other][0] == tool
               for other in (slot-1, slot+1))


def price(cargo, slot, market=0):
    if not valid_slot(slot) or type(market) is not int or market not in (0, 1):
        return 0
    item = cargo[slot]
    if not item or item[0] not in KINDS:
        return 0
    kind = KINDS.index(item[0])
    return BASE[market][kind] + (BONUS[market][kind] if enhanced(cargo, slot) else 0)


def step(state, action):
    shapes = {'sell': 2}
    if not isinstance(action, (tuple, list)) or not action:
        return state, "INVALID ACTION"
    op = action[0]
    if not isinstance(op, str) or op not in shapes or len(action) != shapes[op]:
        return state, "INVALID ACTION"
    cargo = list(state.cargo)
    market = 0
    slot = action[1]
    if not valid_slot(slot):
        return state, "INVALID SLOT"
    if op == "sell":
        if not cargo[slot]:
            return state, "EMPTY SLOT"
        item = cargo[slot]
        # 売る直前の配置で値を決め、その枠だけ空にする。
        value = price(state.cargo, slot, market)
        cargo[slot] = ''
        return replace(state, cargo=tuple(cargo), coins=state.coins+value,
                       sold=state.sold+((item, market, value),)), "SOLD FOR "+str(value)
    return state, "INVALID ACTION"


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

    def reset(self):
        self.state = State()
        self.selected = 0
        self.locked = False
        self.message = "CHOOSE A SLOT"

    def act(self, action):
        self.state, self.message = step(self.state, action)

    def control(self, pressed, held):
        # 確定後も複数キー拒否後も全解放を待つ。Rもゲート中は待機。
        if self.locked:
            if not held:
                self.locked = False
            return
        if 'R' in pressed:
            self.reset()
            self.locked = True
            return
        if len(held) > 1 or len(pressed) > 1:
            self.locked = bool(held)
            return
        if len(pressed) != 1 or pressed != held:
            return
        key = next(iter(pressed))
        if key in ('LEFT', 'RIGHT'):
            self.selected = (self.selected+(1 if key == 'RIGHT' else -1)) % 4
        elif key == 'Z':
            self.act(('sell', self.selected))
        else:
            return
        self.locked = True

    def draw(self, p):
        state = self.state
        p.cls(1)
        p.text(8, 8, "CARGO MERCHANT / STAGE 2", 10)
        p.text(8, 22, "MARKET 1   COINS "+str(state.coins), 7)
        p.text(8, 34, "PRACTICE PRESET / R RESTARTS", 6)
        for slot, item in enumerate(state.cargo):
            x = 8+slot*90
            p.rect(x, 52, 84, 94, 2)
            p.rectb(x, 52, 84, 94, 10 if slot == self.selected else 5)
            p.text(x+5, 59, str(slot+1)+": "+(item or 'EMPTY'), 7)
            if item:
                color = {'C': 12, 'M': 8, 'O': 13, 'L': 10, 'K': 6, 'T': 9}[item[0]]
                p.circ(x+42, 87, 12, color)
                p.text(x+40, 85, item[0], 1)
                if enhanced(state.cargo, slot):
                    p.text(x+5, 103, "ENHANCED", 11)
            for market in range(1):
                quote = str(price(state.cargo, slot, market))
                p.text(x+5, 117+12*market, "M"+str(market+1)+" $"+quote, 7)
        p.text(8, 156, "L -> C   K -> M   T -> O / ADJACENT ONLY", 6)
        p.text(8, 168, "MARKET 1: "+"   ".join(k+" "+str(BASE[0][i])+"+"+str(BONUS[0][i]) for i, k in enumerate(KINDS)), 7)
        p.text(8, 180, "SELLING A TOOL REMOVES ITS BONUS NOW", 8)
        p.text(8, 198, "LEFT/RIGHT SELECT / Z SELL", 10)
        p.text(8, 242, self.message, 11)
        p.text(8, 276, "LEFT/RIGHT SELECT   Z CONFIRM   R RESET", 7)
        p.text(8, 290, "ESC QUIT / FICTIONAL GAME PRICES", 6)

DEMO_KEYS = ('RIGHT', 'Z')


def main(headless=False, screenshot=None, demo=False, preview=False):
    from pathlib import Path
    from dataclasses import asdict
    import json
    import pyxel as p
    target = Path(screenshot).resolve() if screenshot else None
    if target:
        target.parent.mkdir(parents=True, exist_ok=True)
    app = App()
    p.init(368, 304, title='Cargo Merchant', fps=30, display_scale=2, headless=headless)
    keys = {key: getattr(p, 'KEY_'+key) for key in ('LEFT', 'RIGHT', 'UP', 'DOWN', 'Z', 'SPACE', 'X', 'R')}
    demo_keys = DEMO_KEYS
    limit = max(12, 2*len(demo_keys)+4) if demo or preview else 12

    def update():
        if headless and p.frame_count >= limit:
            if target:
                p.screenshot(str(target), scale=2)
                record = {'stage': 2, 'mode': 'preview' if preview else 'checkpoint' if demo else 'initial',
                          'input_kind': 'synthetic controller keys; not OS/human input',
                          'frames': p.frame_count, 'state': asdict(app.state),
                          'selected': app.selected, 'message': app.message}
                target.with_suffix('.json').write_text(json.dumps(record, ensure_ascii=False, indent=2), encoding='utf-8')
            p.quit()
            return
        if headless and (demo or preview):
            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({key for key, code in keys.items() if p.btnp(code)},
                        {key for key, code in keys.items() if p.btn(code)})
    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('--demo-preview', action='store_true')
    parser.add_argument('--screenshot')
    args = parser.parse_args()
    main(args.headless_smoke, args.screenshot, args.demo_checkpoint, args.demo_preview)