import asyncio
import traceback
import datetime
import humanize


class Common:
    def __init__(self, bot):
        self.bot = bot

        self.bot.async_call_shell = self.async_call_shell
        self.bot.slice_message = self.slice_message
        self.max_split_length = 3
        self.bot.hex_to_int = self.hex_to_int
        self.bot.download_file = self.download_file
        self.bot.aiojson = self.aiojson
        self.bot.aioget = self.aioget
        self.bot.aiogetbytes = self.aiogetbytes
        self.bot.get_relative_timestamp = self.get_relative_timestamp


def get_relative_timestamp(self, time_from=None, time_to=None,
                           humanized=False, include_from=False,
                           include_to=False):
    # Setting default value to utcnow() makes it show time from cog load
    # which is not what we want
    if not time_from:
        time_from = datetime.datetime.utcnow()
    if not time_to:
        time_to = datetime.datetime.utcnow()
    if humanized:
        humanized_string = humanize.naturaltime(time_to - time_from)
        if include_from and include_to:
            str_with_from_and_to = f"{humanized_string} "\
                                   f"({str(time_from).split('.')[0]} "\
                                   f"- {str(time_to).split('.')[0]})"
            return str_with_from_and_to
        elif include_from:
            str_with_from = f"{humanized_string} "\
                            f"({str(time_from).split('.')[0]})"
            return str_with_from
        elif include_to:
            str_with_to = f"{humanized_string} ({str(time_to).split('.')[0]})"
            return str_with_to
        return humanized_string
    else:
        epoch = datetime.datetime.utcfromtimestamp(0)
        epoch_from = (time_from - epoch).total_seconds()
        epoch_to = (time_to - epoch).total_seconds()
        second_diff = epoch_to - epoch_from
        result_string = str(datetime.timedelta(
            seconds=second_diff)).split('.')[0]
        return result_string

    async def aioget(self, url):
        try:
            data = await self.bot.aiosession.get(url)
            if data.status == 200:
                text_data = await data.text()
                self.bot.log.info(f"Data from {url}: {text_data}")
                return text_data
            else:
                self.bot.log.error(f"HTTP Error {data.status} "
                                   "while getting {url}")
        except:
            self.bot.log.error(f"Error while getting {url} "
                               f"on aiogetbytes: {traceback.format_exc()}")

    async def aiogetbytes(self, url):
        try:
            data = await self.bot.aiosession.get(url)
            if data.status == 200:
                byte_data = await data.read()
                self.bot.log.debug(f"Data from {url}: {byte_data}")
                return byte_data
            else:
                self.bot.log.error(f"HTTP Error {data.status} "
                                   "while getting {url}")
        except:
            self.bot.log.error(f"Error while getting {url} "
                               f"on aiogetbytes: {traceback.format_exc()}")

    async def aiojson(self, url):
        try:
            data = await self.bot.aiosession.get(url)
            if data.status == 200:
                text_data = await data.text()
                self.bot.log.info(f"Data from {url}: {text_data}")
                content_type = data.headers['Content-Type']
                return await data.json(content_type=content_type)
            else:
                self.bot.log.error(f"HTTP Error {data.status} "
                                   "while getting {url}")
        except:
            self.bot.log.error(f"Error while getting {url} "
                               f"on aiogetbytes: {traceback.format_exc()}")

    def hex_to_int(self, color_hex: str):
        """Turns a given hex color into an integer"""
        return int("0x" + color_hex.strip('#'), 16)

    # This function is based on https://stackoverflow.com/a/35435419/3286892
    # by link2110 (https://stackoverflow.com/users/5890923/link2110)
    # modified by Ave (https://github.com/aveao), licensed CC-BY-SA 3.0
    async def download_file(self, url, local_filename):
        file_resp = await self.bot.aiosession.get(url)
        file = await file_resp.read()
        with open(local_filename, "wb") as f:
            f.write(file)

    # 2000 is maximum limit of discord
    async def slice_message(self, text, size=2000, prefix="", suffix=""):
        """Slices a message into multiple messages"""
        if len(text) > size * self.max_split_length:
            haste_url = await self.haste(text)
            return [f"Message is too long ({len(text)} > "
                    f"{size * self.max_split_length} "
                    f"({size} * {self.max_split_length}))"
                    f", go to haste: <{haste_url}>"]
        reply_list = []
        size_wo_fix = size - len(prefix) - len(suffix)
        while len(text) > size_wo_fix:
            reply_list.append(f"{prefix}{text[:size_wo_fix]}{suffix}")
            text = text[size_wo_fix:]
        reply_list.append(f"{prefix}{text}{suffix}")
        return reply_list

    async def haste(self, text, instance='https://hastebin.com/'):
        response = await self.bot.aiosession.post(f"{instance}documents",
                                                  data=text)
        if response.status == 200:
            result_json = await response.json()
            return f"{instance}{result_json['key']}"

    async def async_call_shell(self, shell_command: str,
                               inc_stdout=True, inc_stderr=True):
        pipe = asyncio.subprocess.PIPE
        proc = await asyncio.create_subprocess_shell(str(shell_command),
                                                     stdout=pipe,
                                                     stderr=pipe)

        if not (inc_stdout or inc_stderr):
            return "??? you set both stdout and stderr to False????"

        proc_result = await proc.communicate()
        stdout_str = proc_result[0].decode('utf-8').strip()
        stderr_str = proc_result[1].decode('utf-8').strip()

        if inc_stdout and not inc_stderr:
            return stdout_str
        elif inc_stderr and not inc_stdout:
            return stderr_str

        if stdout_str and stderr_str:
            return f"stdout:\n\n{stdout_str}\n\n"\
                   f"======\n\nstderr:\n\n{stderr_str}"
        elif stdout_str:
            return f"stdout:\n\n{stdout_str}"
        elif stderr_str:
            return f"stderr:\n\n{stderr_str}"

        return "No output."


def setup(bot):
    bot.add_cog(Common(bot))