import discord
import humanize
from typing import Tuple

import pluralkit
from pluralkit.bot.utils import escape
from pluralkit.member import Member
from pluralkit.switch import Switch
from pluralkit.system import System
from pluralkit.utils import get_fronters


def truncate_field_name(s: str) -> str:
    return s[:256]


def truncate_field_body(s: str) -> str:
    return s[:1024]


def truncate_description(s: str) -> str:
    return s[:2048]


def truncate_title(s: str) -> str:
    return s[:256]


def success(text: str) -> discord.Embed:
    embed = discord.Embed()
    embed.description = truncate_description(text)
    embed.colour = discord.Colour.green()
    return embed


def error(text: str, help: Tuple[str, str] = None) -> discord.Embed:
    embed = discord.Embed()
    embed.description = truncate_description(text)
    embed.colour = discord.Colour.dark_red()

    if help:
        help_title, help_text = help
        embed.add_field(name=truncate_field_name(help_title), value=truncate_field_body(help_text))

    return embed


def status(text: str) -> discord.Embed:
    embed = discord.Embed()
    embed.description = truncate_description(text)
    embed.colour = discord.Colour.blue()
    return embed


def exception_log(message_content, author_name, author_discriminator, author_id, server_id, channel_id) -> discord.Embed:
    embed = discord.Embed()
    embed.colour = discord.Colour.dark_red()
    embed.title = truncate_title(message_content)

    embed.set_footer(text="Sender: {}#{} ({}) | Server: {} | Channel: {}".format(
        author_name, author_discriminator, author_id,
        server_id if server_id else "(DMs)",
        channel_id
    ))
    return embed


async def system_card(conn, client: discord.Client, system: System) -> discord.Embed:
    card = discord.Embed()
    card.colour = discord.Colour.blue()

    if system.name:
        card.title = truncate_title(system.name)

    if system.avatar_url:
        card.set_thumbnail(url=system.avatar_url)

    if system.tag:
        card.add_field(name="Tag", value=truncate_field_body(system.tag))

    fronters, switch_time = await get_fronters(conn, system.id)
    if fronters:
        names = ", ".join([member.name for member in fronters])
        fronter_val = "{} (for {})".format(names, humanize.naturaldelta(switch_time))
        card.add_field(name="Current fronter" if len(fronters) == 1 else "Current fronters", value=truncate_field_body(fronter_val))

    account_names = []
    for account_id in await system.get_linked_account_ids(conn):
        account = await client.get_user_info(account_id)
        account_names.append("{}#{}".format(account.name, account.discriminator))

    card.add_field(name="Linked accounts", value=truncate_field_body("\n".join(account_names)))

    if system.description:
        card.add_field(name="Description",
                       value=truncate_field_body(system.description), inline=False)

    # Get names of all members
    all_members = await system.get_members(conn)
    if all_members:
        member_texts = []
        for member in all_members:
            member_texts.append("{} (`{}`)".format(escape(member.name), member.hid))

        # Interim solution for pagination of large systems
        # Previously a lot of systems would hit the 1024 character limit and thus break the message
        # This splits large system lists into multiple embed fields
        # The 6000 character total limit will still apply here but this sort of pushes the problem until I find a better fix
        pages = [""]
        for member in member_texts:
            last_page = pages[-1]
            new_page = last_page + "\n" + member if last_page else member

            if len(new_page) >= 1024:
                pages.append(member)
            else:
                pages[-1] = new_page

        for index, page in enumerate(pages):
            field_name = "Members"
            if index >= 1:
                field_name = "Members (part {})".format(index + 1)
            card.add_field(name=truncate_field_name(field_name), value=truncate_field_body(page), inline=False)

    card.set_footer(text="System ID: {}".format(system.hid))
    return card


async def member_card(conn, member: Member) -> discord.Embed:
    system = await member.fetch_system(conn)

    card = discord.Embed()
    card.colour = discord.Colour.blue()

    name_and_system = member.name
    if system.name:
        name_and_system += " ({})".format(system.name)

    card.set_author(name=truncate_field_name(name_and_system), icon_url=member.avatar_url or discord.Embed.Empty)
    if member.avatar_url:
        card.set_thumbnail(url=member.avatar_url)

    if member.color:
        card.colour = int(member.color, 16)

    if member.birthday:
        bday_val = member.birthday.strftime("%b %d, %Y")
        if member.birthday.year == 1:
            bday_val = member.birthday.strftime("%b %d")
        card.add_field(name="Birthdate", value=bday_val)

    if member.pronouns:
        card.add_field(name="Pronouns", value=truncate_field_body(member.pronouns))

    message_count = await member.message_count(conn)
    if message_count > 0:
        card.add_field(name="Message Count", value=str(message_count), inline=True)

    if member.prefix or member.suffix:
        prefix = member.prefix or ""
        suffix = member.suffix or ""
        card.add_field(name="Proxy Tags",
                       value=truncate_field_body("{}text{}".format(prefix, suffix)))

    if member.description:
        card.add_field(name="Description",
                       value=truncate_field_body(member.description), inline=False)

    card.set_footer(text="System ID: {} | Member ID: {}".format(system.hid, member.hid))
    return card


async def front_status(switch: Switch, conn) -> discord.Embed:
    if switch:
        embed = status("")
        fronter_names = [member.name for member in await switch.fetch_members(conn)]

        if len(fronter_names) == 0:
            embed.add_field(name="Current fronter", value="(no fronter)")
        elif len(fronter_names) == 1:
            embed.add_field(name="Current fronter", value=truncate_field_body(fronter_names[0]))
        else:
            embed.add_field(name="Current fronters", value=truncate_field_body(", ".join(fronter_names)))

        if switch.timestamp:
            embed.add_field(name="Since",
                            value="{} ({})".format(switch.timestamp.isoformat(sep=" ", timespec="seconds"),
                                                   humanize.naturaltime(pluralkit.utils.fix_time(switch.timestamp))))
    else:
        embed = error("No switches logged.")
    return embed