import secrets
from core.builtins.message import MessageSession
from core.component import module
from .zhNum2Int import Zh2Int

MAX_COIN_NUM = 100
FACE_UP_RATE = 4975  # n/10000 
FACE_DOWN_RATE = 4975
COIN_DROP_PLACES = ["地上","桌子上","桌子底下","门口","窗户外","月球"]  # 硬币可能掉落的位置

coin = module('coin', developers=['Light-Beacon'], desc='抛n枚硬币')

@coin.command('[<amount>] {抛n枚硬币}')
async def _(msg: MessageSession):
    amount = msg.parsed_msg.get('<amount>', '1')
    if not amount.isdigit():
        await msg.finish('发生错误：无效的硬币个数：' + amount)
    else:
        await msg.finish(await flipCoins(int(amount)))

@coin.regex(r"[丢|抛](.*)?[个|枚]?硬币", desc='[丢/抛](n)[个/枚]硬币')
async def _(message: MessageSession):
    groups = message.matched_msg.groups()
    count = groups[0] if groups[0] else '1'
    if count.isdigit():
        count = int(count)
    else:
        try:
            count = Zh2Int(count)
        except ValueError as e:
            await message.finish("发生错误：" + e.message)
    await message.finish(await flipCoins(count))

async def flipCoins(count:int):
    if count > MAX_COIN_NUM:
        return f"发生错误：你最多只能抛 {MAX_COIN_NUM} 个硬币"
    if count <= 0:
        return f"发生错误：你抛了个空气，什么也没发生..."
    if FACE_UP_RATE + FACE_DOWN_RATE > 10000 or FACE_UP_RATE < 0 or FACE_DOWN_RATE < 0:
        raise OverflowError("发生错误：硬币概率错误")
    faceUp = 0
    faceDown = 0
    stand = 0
    for i in range(count):
        randnum = secrets.randbelow(10000)
        if randnum < FACE_UP_RATE:
            faceUp += 1
        elif randnum < FACE_UP_RATE + FACE_DOWN_RATE:
            faceDown += 1
        else:
            stand += 1
    head = f"你抛了 {count} 枚硬币，"
    if count == 1:
        drop_place = COIN_DROP_PLACES[secrets.randbelow(len(COIN_DROP_PLACES))]
        head += f"它掉到了{drop_place}...\n"
        if faceUp:
            return head + "...是正面！"
        elif faceDown:
            return head + "...是反面！"
        else:
            return head + "...它立起来了！"
    else:
        if not (stand or faceDown):
            return head + "它们...\n...全是正面！"
        if not (stand or faceUp):
            return head + "它们...\n...全是反面！"
        if not (faceUp or faceDown):
            return head + "它们...\n...全都立起来了？！"
        output = head + "其中...\n有"
        if faceUp:
            output += f" {faceUp} 枚是正面，"
        if faceDown:
            output += f"{faceDown} 枚是反面"
        if stand:
            output += f"...还有 {stand} 枚立起来了！"
        else:
            output += f"。"
        return output