from base64 import b64decode, b64encode
from io import BytesIO
from typing import Literal, overload

from nonebot_plugin_userinfo import UserInfo  # type: ignore[import-untyped]
from PIL import Image

from ..templates import path
from .browser import BrowserManager


@overload
async def get_avatar(user: UserInfo, scheme: Literal['Data URI'], default: str | None) -> str:
    """获取用户头像的指定格式

    Args:
        user (UserInfo): 要获取的用户
        scheme (Literal['Data URI']): 格式
        default (str | None): 获取不到时的默认值

    Raises:
        TypeError: Can't get avatar: 当获取不到头像并且没有设置默认值时抛出
        TypeError: Can't get avatar format: 当获取到的头像无法识别格式时抛出

    Returns:
        str: Data URI 格式的头像
    """


@overload
async def get_avatar(user: UserInfo, scheme: Literal['bytes'], default: str | None) -> bytes:
    """获取用户头像的指定格式

    Args:
        user (UserInfo): 要获取的用户
        scheme (Literal['bytes']): 格式
        default (str | None): 获取不到时的默认值

    Returns:
        bytes: bytes 格式的头像
    """


async def get_avatar(user: UserInfo, scheme: Literal['Data URI', 'bytes'], default: str | None) -> str | bytes:
    if user.user_avatar is None:
        if default is None:
            raise TypeError("Can't get avatar")
        return default
    bot_avatar = await user.user_avatar.get_image()
    if scheme == 'Data URI':
        avatar_format = Image.open(BytesIO(bot_avatar)).format
        if avatar_format is None:
            raise TypeError("Can't get avatar format")
        return f'data:{Image.MIME[avatar_format]};base64,{b64encode(bot_avatar).decode()}'
    return bot_avatar


async def generate_identicon(hash: str) -> bytes:  # noqa: A002
    """使用 identicon 生成头像

    Args:
        hash (str): 提交给 identicon 的 hash 值

    Returns:
        bytes: identicon 生成的 svg 的二进制数据
    """
    browser = await BrowserManager.get_browser()
    async with await browser.new_page() as page:
        await page.add_script_tag(path=path / 'js/identicon.js')
        return b64decode(
            await page.evaluate(rf"""
                new Identicon('{hash}', {{
                    background: [0x08, 0x0a, 0x06, 255],
                    margin: 0.15,
                    size: 300,
                    brightness: 0.48,
                    saturation: 0.65,
                    format: 'svg',
                }}).toString();
                """)
        )