import discord
import pytz
from datetime import datetime
from pytz import all_timezones
from pytz import country_timezones
from typing import Optional
from redbot.core import Config, commands, checks


class Timezone(commands.Cog):
    """Gets times across the world..."""

    def __init__(self, bot):
        self.bot = bot
        self.config = Config.get_conf(self, 278049241001, force_registration=True)
        default_user = {"usertime": None}
        self.config.register_user(**default_user)

    @commands.guild_only()
    @commands.group()
    async def time(self, ctx):
        """
            Checks the time.

            For the list of supported timezones, see here:
            https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
        """
        pass

    @time.command()
    async def tz(self, ctx, *, tz: Optional[str] = None):
        """Gets the time in any timezone."""
        try:
            if tz is None:
                time = datetime.now()
                fmt = "**%H:%M** %d-%B-%Y"
                await ctx.send(f"Current system time: {time.strftime(fmt)}")
            else:
                if "'" in tz:
                    tz = tz.replace("'", "")
                if len(tz) > 4 and "/" not in tz:
                    await ctx.send(
                        "Error: Incorrect format. Use:\n **Continent/City** with correct capitals. "
                        "e.g. `America/New_York`\n See the full list of supported timezones here:\n "
                        "<https://en.wikipedia.org/wiki/List_of_tz_database_time_zones>"
                    )
                else:
                    fmt = "**%H:%M** %d-%B-%Y **%Z (UTC %z)**"
                    time = datetime.now(pytz.timezone(tz.title()))
                    await ctx.send(time.strftime(fmt))
        except Exception as e:
            await ctx.send(f"**Error:** {str(e)} is an unsupported timezone.")

    @time.command()
    async def iso(self, ctx, *, code=None):
        """Looks up ISO3166 country codes and gives you a supported timezone."""
        if code is None:
            await ctx.send("That doesn't look like a country code!")
        else:
            exist = True if code in country_timezones else False
            if exist is True:
                tz = str(country_timezones(code))
                msg = (
                    f"Supported timezones for **{code}:**\n{tz[:-1][1:]}"
                    f"\n**Use** `[p]time tz Continent/City` **to display the current time in that timezone.**"
                )
                await ctx.send(msg)
            else:
                await ctx.send(
                    "That code isn't supported. For a full list, see here: "
                    "<https://en.wikipedia.org/wiki/List_of_tz_database_time_zones>"
                )

    @time.command()
    async def me(self, ctx, *, tz=None):
        """
            Sets your timezone.
            Usage: [p]time me Continent/City
        """
        if tz is None:
            usertime = await self.config.user(ctx.message.author).usertime()
            if not usertime:
                await ctx.send(
                    "You haven't set your timezone. Do `[p]time me Continent/City`: "
                    "see <https://en.wikipedia.org/wiki/List_of_tz_database_time_zones>"
                )
            else:
                time = datetime.now(pytz.timezone(usertime))
                time = time.strftime("**%H:%M** %d-%B-%Y **%Z (UTC %z)**")
                msg = f"Your current timezone is **{usertime}.**\n" f"The current time is: {time}"
                await ctx.send(msg)
        else:
            exist = True if tz.title() in all_timezones else False
            if exist:
                if "'" in tz:
                    tz = tz.replace("'", "")
                await self.config.user(ctx.message.author).usertime.set(tz.title())
                await ctx.send(f"Successfully set your timezone to **{tz.title()}**.")
            else:
                await ctx.send(
                    "**Error:** Unrecognized timezone. Try `[p]time me Continent/City`: "
                    "see <https://en.wikipedia.org/wiki/List_of_tz_database_time_zones>"
                )

    @time.command()
    @checks.admin_or_permissions(manage_guild=True)
    async def set(self, ctx, user: discord.Member, *, tz=None):
        """Allows the mods to edit timezones."""
        if not user:
            user = ctx.message.author
        if tz is None:
            await ctx.send("That timezone is invalid.")
            return
        else:
            exist = True if tz.title() in all_timezones else False
            if exist:
                if "'" in tz:
                    tz = tz.replace("'", "")
                await self.config.user(user).usertime.set(tz.title())
                await ctx.send(f"Successfully set {user.name}'s timezone to **{tz.title()}**.")
            else:
                await ctx.send(
                    "**Error:** Unrecognized timezone. Try `[p]time set @user Continent/City`: "
                    "see <https://en.wikipedia.org/wiki/List_of_tz_database_time_zones>"
                )

    @time.command()
    async def user(self, ctx, user: discord.Member = None):
        """Shows the current time for user."""
        if not user:
            await ctx.send("That isn't a user!")
        else:
            usertime = await self.config.user(user).usertime()
            if usertime:
                time = datetime.now(pytz.timezone(usertime))
                fmt = "**%H:%M** %d-%B-%Y **%Z (UTC %z)**"
                time = time.strftime(fmt)
                await ctx.send(
                    f"{user.name}'s current timezone is: **{usertime}**\n"
                    f"The current time is: {str(time)}"
                )
            else:
                await ctx.send("That user hasn't set their timezone.")