import datetime as dt

from core import User
from core.tables import users

from utils import interactive  # noqa

from .module import module


first_emoji = "🥇"
second_emoji = "🥈"
third_emoji = "🥉"


# TODO: in_guild ward
@module.cmd(
    "top",
    short_help="View the Study Time leaderboard.",
    aliases=('ttop', 'toptime')
)
async def cmd_top(ctx):
    """
    Usage``:
        {prefix}top
        {prefix}top 100
    Description:
        Display the study time leaderboard, or the top 100.

        Use the paging reactions or send `p<n>` to switch pages (e.g. `p11` to switch to page 11).
    """
    # Handle args
    if ctx.args and not ctx.args == "100":
        return await ctx.error_reply(
            "**Usage:**`{prefix}top` or `{prefix}top100`.".format(prefix=ctx.client.prefix)
        )
    top100 = ctx.args == "100"

    # Flush any pending coin transactions
    User.sync()

    # Fetch the leaderboard
    user_data = users.select_where(
        select_columns=('userid', 'tracked_time'),
        _extra="ORDER BY tracked_time DESC " + ("LIMIT 100" if top100 else "")
    )

    # Quit early if the leaderboard is empty
    if not user_data:
        return await ctx.reply("No leaderboard entries yet!")

    # Extract entries
    author_index = None
    entries = []
    for i, (userid, time) in enumerate(user_data):
        member = ctx.guild.get_member(userid)
        name = member.display_name if member else str(userid)
        name = name.replace('*', ' ').replace('_', ' ')

        num_str = "{}.".format(i+1)

        hours = time // 3600
        minutes = time // 60 % 60
        seconds = time % 60

        time_str = "{}:{:02}:{:02}".format(
            hours,
            minutes,
            seconds
        )

        if ctx.author.id == userid:
            author_index = i

        entries.append((num_str, name, time_str))

    # Extract blocks
    blocks = [entries[i:i+20] for i in range(0, len(entries), 20)]
    block_count = len(blocks)

    # Build strings
    header = "Study Time Top 100" if top100 else "Study Time Leaderboard"
    if block_count > 1:
        header += " (Page {{page}}/{})".format(block_count)

    # Build pages
    pages = []
    for i, block in enumerate(blocks):
        max_num_l, max_name_l, max_time_l = [max(len(e[i]) for e in block) for i in (0, 1, 2)]
        body = '\n'.join(
            "{:>{}} {:<{}} \t {:>{}} {} {}".format(
                entry[0], max_num_l,
                entry[1], max_name_l + 2,
                entry[2], max_time_l + 1,
                first_emoji if i == 0 and j == 0 else (
                    second_emoji if i == 0 and j == 1 else (
                        third_emoji if i == 0 and j == 2 else ''
                    )
                ),
                "⮜" if author_index is not None and author_index == i * 20 + j else ""
            )
            for j, entry in enumerate(block)
        )
        title = header.format(page=i+1)
        line = '='*len(title)
        pages.append(
            "```md\n{}\n{}\n{}```".format(title, line, body)
        )

    # Finally, page the results
    await ctx.pager(pages, start_at=(author_index or 0)//20 if not top100 else 0)