"""
Weather extension for qrm
---
Copyright (C) 2019 Abigail Gold, 0x5c

This file is part of discord-qrm2 and is released under the terms of the GNU
General Public License, version 2.
"""

import io
from datetime import datetime
import re

import discord
import discord.ext.commands as commands

import aiohttp

import common as cmn


class WeatherCog(commands.Cog):
    wttr_units_regex = re.compile(r"\B-([cCfF])\b")

    def __init__(self, bot: commands.Bot):
        self.bot = bot

    @commands.command(name="bandconditions", aliases=['cond', 'condx', 'conditions'], category=cmn.cat.weather)
    async def _band_conditions(self, ctx: commands.Context):
        '''Posts an image of HF Band Conditions.'''
        with ctx.typing():
            embed = discord.Embed(title='Current Solar Conditions',
                                  colour=cmn.colours.good,
                                  timestamp=datetime.utcnow())
            async with aiohttp.ClientSession() as session:
                async with session.get('http://www.hamqsl.com/solarsun.php') as resp:
                    if resp.status != 200:
                        embed.description = 'Could not download file...'
                        embed.colour = cmn.colours.bad
                    else:
                        data = io.BytesIO(await resp.read())
                        embed.set_image(url=f'attachment://condx.png')
            embed.set_footer(text=ctx.author.name,
                             icon_url=str(ctx.author.avatar_url))
        await ctx.send(embed=embed, file=discord.File(data, 'condx.png'))

    @commands.group(name="weather", aliases=['wttr'], category=cmn.cat.weather)
    async def _weather_conditions(self, ctx: commands.Context):
        '''Posts an image of Local Weather Conditions from [wttr.in](http://wttr.in/).

*Supported location types:*
    city name: `paris`
    any location: `~Eiffel Tower`
    Unicode name of any location in any language: `Москва`
    airport code (3 letters): `muc`
    domain name `@stackoverflow.com`
    area codes: `12345`
    GPS coordinates: `-78.46,106.79`
        '''
        if ctx.invoked_subcommand is None:
            await ctx.send_help(ctx.command)

    @_weather_conditions.command(name='forecast', aliases=['fc', 'future'], category=cmn.cat.weather)
    async def _weather_conditions_forecast(self, ctx: commands.Context, *, location: str):
        '''Posts an image of Local Weather Conditions for the next three days from [wttr.in](http://wttr.in/).
See help for weather command for possible location types. Add a `-c` or `-f` to use Celcius or Fahrenheit.'''
        with ctx.typing():
            try:
                units_arg = re.search(self.wttr_units_regex, location).group(1)
            except AttributeError:
                units_arg = ''
            if units_arg.lower() == 'f':
                units = 'u'
            elif units_arg.lower() == 'c':
                units = 'm'
            else:
                units = ''

            loc = self.wttr_units_regex.sub('', location).strip()

            embed = discord.Embed(title=f'Weather Forecast for {loc}',
                                  description='Data from [wttr.in](http://wttr.in/).',
                                  colour=cmn.colours.good,
                                  timestamp=datetime.utcnow())
            loc = loc.replace(' ', '+')
            async with aiohttp.ClientSession() as session:
                async with session.get(f'http://wttr.in/{loc}_{units}pnFQ.png') as resp:
                    if resp.status != 200:
                        embed.description = 'Could not download file...'
                        embed.colour = cmn.colours.bad
                    else:
                        data = io.BytesIO(await resp.read())
                        embed.set_image(url=f'attachment://wttr_forecast.png')
            embed.set_footer(text=ctx.author.name,
                             icon_url=str(ctx.author.avatar_url))
        await ctx.send(embed=embed, file=discord.File(data, f'wttr_forecast.png'))

    @_weather_conditions.command(name='now', aliases=['n'], category=cmn.cat.weather)
    async def _weather_conditions_now(self, ctx: commands.Context, *, location: str):
        '''Posts an image of current Local Weather Conditions from [wttr.in](http://wttr.in/).
See help for weather command for possible location types. Add a `-c` or `-f` to use Celcius or Fahrenheit.'''
        with ctx.typing():
            try:
                units_arg = re.search(self.wttr_units_regex, location).group(1)
            except AttributeError:
                units_arg = ''
            if units_arg.lower() == 'f':
                units = 'u'
            elif units_arg.lower() == 'c':
                units = 'm'
            else:
                units = ''

            loc = self.wttr_units_regex.sub('', location).strip()

            embed = discord.Embed(title=f'Current Weather for {loc}',
                                  description='Data from [wttr.in](http://wttr.in/).',
                                  colour=cmn.colours.good,
                                  timestamp=datetime.utcnow())
            loc = loc.replace(' ', '+')
            async with aiohttp.ClientSession() as session:
                async with session.get(f'http://wttr.in/{loc}_0{units}pnFQ.png') as resp:
                    if resp.status != 200:
                        embed.description = 'Could not download file...'
                        embed.colour = cmn.colours.bad
                    else:
                        data = io.BytesIO(await resp.read())
                        embed.set_image(url=f'attachment://wttr_now.png')
            embed.set_footer(text=ctx.author.name,
                             icon_url=str(ctx.author.avatar_url))
        await ctx.send(embed=embed, file=discord.File(data, 'wttr_now.png'))


def setup(bot: commands.Bot):
    bot.add_cog(WeatherCog(bot))