import logging
import traceback

import asyncpg

from discord.ext import commands

from .common import Cog
from .utils import Table, Timer

log = logging.getLogger(__name__)


def no_codeblock(text: str) -> str:
    """
    Removes codeblocks (grave accents), python and sql syntax highlight
    indicators from a text if present.
    .. note:: only the start of a string is checked, the text is allowed
     to have grave accents in the middle
    """
    if text.startswith('```'):
        text = text[3:-3]

        if text.startswith(('py', 'sql')):
            # cut off the first line as this removes the
            # highlight indicator regardless of length
            text = '\n'.join(text.split('\n')[1:])

    if text.startswith('`'):
        text = text[1:-1]

    return text


class Admin(Cog):
    async def __local_check(self, ctx):
        return ctx.author.id == self.bot.owner_id

    @commands.command()
    @commands.is_owner()
    async def shutdown(self, ctx):
        log.info('Logging out! %s', ctx.author)
        await ctx.send("dude rip")
        await self.bot.logout()

    @commands.command()
    @commands.is_owner()
    async def load(self, ctx, *exts: str):
        """Loads an extension."""
        for ext in exts:
            try:
                self.bot.load_extension("bot.ext." + ext)
            except Exception as e:
                await ctx.send(f'Oops. ```py\n{traceback.format_exc()}\n```')
                return
            log.info(f'Loaded {ext}')
            m = ctx.send(f':ok_hand: `{ext}` loaded.')
            self.bot.loop.create_task(m)

    @commands.command(hidden=True)
    @commands.is_owner()
    async def unload(self, ctx, *exts: str):
        """Unloads an extension."""
        for ext in exts:
            self.bot.unload_extension('bot.ext.' + ext)
            log.info(f'Unloaded {ext}')
            m = ctx.send(f':ok_hand: `{ext}` unloaded.')
            self.bot.loop.create_task(m)

    @commands.command(hidden=True)
    @commands.is_owner()
    async def reload(self, ctx, *extensions: str):
        """Reloads an extension"""
        for ext in extensions:
            try:
                self.bot.unload_extension('bot.ext.' + ext)
                self.bot.load_extension('bot.ext.' + ext)
            except Exception as err:
                await ctx.send(f'```{traceback.format_exc()}```')
                return
            log.info(f'Reloaded {ext}')
            m = ctx.send(f':ok_hand: Reloaded `{ext}`')
            self.bot.loop.create_task(m)

    @commands.command(typing=True)
    async def sql(self, ctx, *, statement: no_codeblock):
        """Execute SQL."""
        # this is probably not the ideal solution
        if 'select' in statement.lower():
            coro = self.db.fetch
        else:
            coro = self.db.execute

        try:
            with Timer() as timer:
                result = await coro(statement)
        except asyncpg.PostgresError as e:
            return await ctx.send(f':boom: Failed to execute! {type(e).__name__}: {e}')

        # execute returns the status as a string
        if isinstance(result, str):
            return await ctx.send(f'```py\n{result}```took {timer}')

        if not result:
            return await ctx.send(f'no results, took {timer}')

        # render output of statement
        columns = list(result[0].keys())
        table = Table(*columns)

        for row in result:
            values = [str(x) for x in row]
            table.add_row(*values)

        rendered = await table.render(self.loop)

        # properly emulate the psql console
        rows = len(result)
        rows = f'({rows} row{"s" if rows > 1 else ""})'

        await ctx.send(f'```py\n{rendered}\n{rows}```took {timer}')


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