import hashlib
import os
import re
import traceback
import uuid
from urllib.parse import urlparse, unquote

import requests
import urllib3

from feapder.setting import headers
from untils.execptions import AttachmentNullError
from untils.aliyun import AliYunService
from untils.proxy_pool import ProxyPool

urllib3.disable_warnings()


def hex_sha1(val):
    sha1 = hashlib.sha1()
    if isinstance(val, bytes):
        sha1.update(str(val).encode("utf-8"))
    elif isinstance(val, str):
        sha1.update(val.encode("utf-8"))
    res = sha1.hexdigest()
    return res


def extract_file_type(text):
    if text is None:
        return None

    file_types = {
        'pdf', 'doc', 'docx', 'rar', 'zip', 'gzzb', 'jpg', 'png'
    }
    for file_type in file_types:
        tmp = [file_type, file_type.upper()]
        for t in tmp:
            result = re.match(f'.*{t}$', text, re.S)
            if result is not None:
                return t
    else:
        return None


def extract_file_name(href: str, file_type: str):
    # 中文标点符号:[\u3002\uff1b\uff0c\uff1a\u201c\u201d\uff08\uff09\u3001\uff1f\u300a\u300b]
    # 中文字符:[\u4e00 -\u9fa5]
    zh_char_pattern = '[\u3002\uff1b\uff0c\uff1a\u201c\u201d\uff08\uff09\u3001\uff1f\u300a\u300b\u4e00-\u9fa5]+'
    parser = urlparse(href)
    query = (parser.query or parser.path)
    result = re.search(f'.*\\.{file_type}', query, re.S)
    if result is not None:
        encode_str = unquote(result.group())
        name = re.search(zh_char_pattern, encode_str)
        if name is not None:
            return unquote(name.group())
    return None


def verify_file_name(name):
    if extract_file_type(name) is None:
        raise ValueError


class AttachmentDownloader:

    def __init__(self):
        self.dir_name = 'file'

    def create_dir(self):
        if not os.path.exists(self.dir_name):
            os.makedirs(self.dir_name, mode=0o777, exist_ok=True)

    def create_file_path(self, filename, file_type):
        self.create_dir()
        sign = hex_sha1("{}_{}".format(filename, uuid.uuid4()))
        tmp_name = "{}.{}".format(sign, file_type)
        return "{}/{}".format(self.dir_name, tmp_name)

    @staticmethod
    def create_fid(file_stream: bytes):
        return hex_sha1(file_stream)

    @staticmethod
    def _fetch_attachment(
            url: str,
            file_path: str,
            enable_proxy=False,
            allow_show_exception=False,
            **kwargs
    ):
        request_params = {}
        request_params.setdefault('headers', kwargs.get('headers') or headers)
        request_params.setdefault('proxies', kwargs.get('proxies'))
        request_params.setdefault('timeout', kwargs.get('timeout') or 60)
        request_params.setdefault('stream', kwargs.get('stream') or True)
        request_params.setdefault('verify', kwargs.get('verify') or False)
        if enable_proxy:
            proxy = ProxyPool()
        else:
            proxy = {}
        retries = 0
        while retries < 3:
            try:
                with requests.get(url, **request_params) as req:
                    if req.status_code == 200:
                        stream = req.content
                        with open(file_path, 'wb') as f:
                            f.write(stream)
                        return stream
                    else:
                        retries += 1
            except requests.RequestException:
                if allow_show_exception:
                    traceback.print_exc()
                if enable_proxy:
                    request_params.update({'proxies': proxy.get()})
                retries += 1
        return b''

    @staticmethod
    def clean_attachment(file_path):
        os.remove(file_path)

    @staticmethod
    def getsize(file_path: str):
        def _getsize(filename):
            try:
                return os.path.getsize(filename)
            except:
                return 0

        _kb = float(_getsize(file_path)) / 1024
        if _kb >= 1024:
            _M = _kb / 1024
            if _M >= 1024:
                _G = _M / 1024
                return "{:.1f} G".format(_G)
            else:
                return "{:.1f} M".format(_M)
        else:
            return "{:.1f} kb".format(_kb)

    def fetch_attachment(
            self,
            file_name: str,
            file_type: str,
            download_url: str,
            enable_proxy=False,
            allow_request_exception=False,
            **kwargs
    ):
        if not file_name or not file_type or not download_url:
            raise AttachmentNullError

        file_path = self.create_file_path(file_name, file_type)
        file_stream = self._fetch_attachment(
            download_url,
            file_path,
            enable_proxy,
            allow_request_exception,
            **kwargs
        )
        if len(file_stream) > 0:
            fid = self.create_fid(file_stream)
            '''上传/下载,无论失败成功都需要给出文件基础信息'''
            try:
                result = {
                    'filename': file_name,
                    'ftype': file_type,
                    'fid': "{}.{}".format(fid, file_type),
                    'org_url': download_url,
                    'size': self.getsize(file_path),
                    'url': 'oss',
                }
                AliYunService().push_oss_from_local(result['fid'], file_path)
            except Exception:
                result = {
                    'filename': file_name,
                    'org_url': download_url,
                }
            self.clean_attachment(file_path)
        else:
            result = {
                'filename': file_name,
                'org_url': download_url,
            }
        return result


# if __name__ == '__main__':
    # a = AttachmentDownloader().fetch_attachment(
    #     file_name='成建制移民村（五标段）合同',
    #     file_type='pdf',
    #     download_url='http://222.75.70.90/NXGPPSP_MG/downloadFileServlet?req=F&num=8b80b23f7e729b88017e758a1b03422c'
    # )
    # print(a)