import os
import tempfile
from typing import Any
from dataclasses import dataclass

import httpx
from yarl import URL
from PIL import Image
import io

from .utils import get_api
from .credential import Credential


@dataclass
class Picture:
    """
    (@dataclasses.dataclass)

    图片类，包含图片链接、尺寸以及下载操作。

    Args:
        height    (int)  : 高度

        imageType (str)  : 格式，例如: png

        size      (Any)  : 尺寸

        url       (str)  : 图片链接

        width     (int)  : 宽度

        content   (bytes): 图片内容

    可以不实例化，用 `from_url`, `from_content` 或 `from_file` 加载图片。
    """

    height: int = -1
    imageType: str = ""
    size: Any = ""
    url: str = ""
    width: int = -1
    content: bytes = b""

    def __repr__(self) -> str:
        # no content...
        return f"Picture(height='{self.height}', width='{self.width}', imageType='{self.imageType}', size={self.size}, url='{self.url}')"

    def __set_picture_meta_from_bytes(self, imgtype: str) -> None:
        tmp_dir = tempfile.gettempdir()
        img_path = os.path.join(tmp_dir, "test." + imgtype)
        with open(img_path, "wb+") as file:
            file.write(self.content)
        img = Image.open(img_path)
        self.size = int(round(os.path.getsize(img_path) / 1024, 0))
        self.height = img.height
        self.width = img.width
        self.imageType = imgtype

    @staticmethod
    async def async_load_url(url: str) -> "Picture":
        """
        加载网络图片。(async 方法)

        Args:
            url (str): 图片链接

        Returns:
            Picture: 加载后的图片对象
        """
        if URL(url).scheme == "":
            url = "https:" + url
        obj = Picture()
        session = httpx.AsyncClient()
        resp = await session.get(
            url,
            headers={"User-Agent": "Mozilla/5.0"},
        )
        obj.content = resp.read()
        obj.url = url
        obj.__set_picture_meta_from_bytes(url.split("/")[-1].split(".")[1])
        return obj

    @staticmethod
    def from_url(url: str) -> "Picture":
        """
        加载网络图片。

        Args:
            url (str): 图片链接

        Returns:
            Picture: 加载后的图片对象
        """
        if URL(url).scheme == "":
            url = "https:" + url
        obj = Picture()
        session = httpx.Client()
        resp = session.get(
            url,
            headers={"User-Agent": "Mozilla/5.0"},
        )
        obj.content = resp.read()
        obj.url = url
        obj.__set_picture_meta_from_bytes(url.split("/")[-1].split(".")[1])
        return obj

    @staticmethod
    def from_file(path: str) -> "Picture":
        """
        加载本地图片。

        Args:
            path (str): 图片地址

        Returns:
            Picture: 加载后的图片对象
        """
        obj = Picture()
        with open(path, "rb") as file:
            obj.content = file.read()
        obj.url = "file://" + path
        obj.__set_picture_meta_from_bytes(os.path.basename(path).split(".")[1])
        return obj

    @staticmethod
    def from_content(content: bytes, format: str) -> "Picture":
        """
        加载字节数据

        Args:
            content (str): 图片内容

            format  (str): 图片后缀名，如 `webp`, `jpg`, `ico`

        Returns:
            Picture: 加载后的图片对象
        """
        obj = Picture()
        obj.content = content
        obj.url = "bytes://" + content.decode("utf-8", errors="ignore")
        obj.__set_picture_meta_from_bytes(format)
        return obj

    def _write_to_temp_file(self):
        tmp_dir = tempfile.gettempdir()
        img_path = os.path.join(tmp_dir, "test." + self.imageType)
        open(img_path, "wb").write(self.content)
        return img_path

    async def upload_file(self, credential: Credential, data: dict = None) -> "Picture":
        """
        上传图片至 B 站。

        Args:
            credential (Credential): 凭据类。

        Returns:
            Picture: `self`
        """
        from ..dynamic import upload_image

        res = await upload_image(self, credential, data)
        self.height = res["image_height"]
        self.width = res["image_width"]
        self.url = res["image_url"]
        self.content = self.from_url(self.url).content
        return self

    def upload_file_sync(self, credential: Credential) -> "Picture":
        """
        上传图片至 B 站。(同步函数)

        Args:
            credential (Credential): 凭据类。

        Returns:
            Picture: `self`
        """
        from ..dynamic import upload_image_sync

        res = upload_image_sync(self, credential)
        self.url = res["image_url"]
        self.height = res["image_height"]
        self.width = res["image_width"]
        self.content = self.from_url(self.url).content
        return self

    def download_sync(self, path: str) -> "Picture":
        """
        下载图片至本地。(同步函数)

        Args:
            path (str): 下载地址。

        Returns:
            Picture: `self`
        """
        tmp_dir = tempfile.gettempdir()
        img_path = os.path.join(tmp_dir, "test." + self.imageType)
        open(img_path, "wb").write(self.content)
        img = Image.open(img_path)
        img.save(path, save_all=(True if self.imageType in ["webp", "gif"] else False))
        self.url = "file://" + path
        return self

    def convert_format(self, new_format: str) -> "Picture":
        """
        将图片转换为另一种格式。

        Args:
            new_format (str): 新的格式。例：`png`, `ico`, `webp`.

        Returns:
            Picture: `self`
        """
        tmp_dir = tempfile.gettempdir()
        img_path = os.path.join(tmp_dir, "test." + self.imageType)
        open(img_path, "wb").write(self.content)
        img = Image.open(img_path)
        new_img_path = os.path.join(tmp_dir, "test." + new_format)
        img.save(new_img_path)
        with open(new_img_path, "rb") as file:
            self.content = file.read()
        self.__set_picture_meta_from_bytes(new_format)
        return self

    async def download(self, path: str) -> "Picture":
        """
        下载图片至本地。

        Args:
            path (str): 下载地址。

        Returns:
            Picture: `self`
        """
        tmp_dir = tempfile.gettempdir()
        img_path = os.path.join(tmp_dir, "test." + self.imageType)
        open(img_path, "wb").write(self.content)
        img = Image.open(img_path)
        img.save(path, save_all=(True if self.imageType in ["webp", "gif"] else False))
        self.url = "file://" + path
        return self