#!/usr/local/bin/python3
# coding: utf-8

# YYeTsBot - utils.py
# 6/16/21 21:42
#

__author__ = "Benny <benny.think@gmail.com>"

import contextlib
import logging
import os
import pathlib
import smtplib
import time
from datetime import datetime
from email.header import Header
from email.mime.text import MIMEText
from email.utils import formataddr, parseaddr

import coloredlogs
import pytz
import requests
from akismet import Akismet
from jinja2 import Template


def setup_logger():
    coloredlogs.install(
        level=logging.INFO,
        fmt="[%(asctime)s %(filename)s:%(lineno)d %(levelname).1s] %(message)s",
        datefmt="%Y-%m-%d %H:%M:%S",
    )


def ts_date(ts=None):
    # Let's always set the timezone to CST
    timestamp = ts or time.time()
    return datetime.fromtimestamp(timestamp, pytz.timezone("Asia/Shanghai")).strftime("%Y-%m-%d %H:%M:%S")


def _format_addr(s):
    name, addr = parseaddr(s)
    return formataddr((Header(name, "utf-8").encode(), addr))


def generate_body(context):
    template = pathlib.Path(__file__).parent.parent.joinpath("templates", "email_template.html")
    with open(template) as f:
        return Template(f.read()).render(**context)


def send_mail(to: str, subject: str, context: dict):
    user = os.getenv("email_user")
    password = os.getenv("email_password")
    host = os.getenv("email_host", "localhost")
    port = os.getenv("email_port", "1025")  # mailhog
    from_addr = os.getenv("from_addr", "yyets@dmesg.app")

    msg = MIMEText(generate_body(context), "html", "utf-8")
    msg["From"] = _format_addr("YYeTs <%s>" % from_addr)
    msg["To"] = _format_addr(to)
    msg["Subject"] = Header(subject, "utf-8").encode()

    logging.info("logging to mail server...")
    if port == "1025":
        server = smtplib.SMTP(host, int(port))
    else:
        server = smtplib.SMTP_SSL(host, int(port))
    server.login(user, password)
    logging.info("sending email to %s", to)
    server.sendmail(from_addr, [to], msg.as_string())
    server.quit()


def check_spam(ip, ua, author, content) -> int:
    # 0 means okay
    token = os.getenv("askismet")
    whitelist: "list" = os.getenv("whitelist", "").split(",")
    if author in whitelist:
        return 0
    if token:
        with contextlib.suppress(Exception):
            akismet = Akismet(token, blog="https://yyets.dmesg.app/")

            return akismet.check(
                ip,
                ua,
                comment_author=author,
                blog_lang="zh_cn",
                comment_type="comment",
                comment_content=content,
            )
    return 0


class Cloudflare:
    def __init__(self):
        self.zone_id = "b8e2d2fa75c6f7dc3c2e478e27f3061b"
        self.filter_id = "9e1e9139bcbe400c8b2620ac117a77d8"
        self.endpoint = f"https://api.cloudflare.com/client/v4/zones/{self.zone_id}/filters/{self.filter_id}"
        self.session = requests.Session()
        self.session.headers.update({"Authorization": "Bearer %s" % os.getenv("CF_TOKEN")})

    def get_old_expr(self):
        return self.session.get(self.endpoint).json()["result"]["expression"]

    def ban_new_ip(self, ip):
        logging.warning("Adding %s to cloudflare managed challenge list", ip)
        expr = self.get_old_expr()
        if ip not in expr:
            body = {
                "id": self.filter_id,
                "paused": False,
                "expression": f"{expr} or (ip.src eq {ip})",
            }
            resp = self.session.put(self.endpoint, json=body)
            logging.info(resp.json())

    def clear_fw(self):
        logging.info("Clearing firewall rules")
        body = {
            "id": self.filter_id,
            "paused": False,
            "expression": "(ip.src eq 192.168.2.1)",
        }
        self.session.put(self.endpoint, json=body)


if __name__ == "__main__":
    send_mail("benny.think@gmail.com", "主题", {"username": "test123", "text": "测试内容<b>不错</b>"})