from typing import Dict, List
from collections import defaultdict
import discord


# Custom libs

from logs import ChannelLogs, MessageLog
from .scanner import Scanner
from data_types import Counter
from utils import (
    generate_help,
    plural,
    precise,
    mention,
    alt_mention,
    role_mention,
    channel_mention,
)


class MentionsScanner(Scanner):
    @staticmethod
    def help() -> str:
        return generate_help(
            "mentions",
            "Rank mentions by their usage",
            args=[
                "<n> - top <n>, default is 10",
                "all - show role/channel/everyone/here mentions",
                "everyone - include bots mentions",
            ],
            example="10 #mychannel1 #mychannel2 @user",
        )

    def __init__(self):
        super().__init__(
            has_digit_args=True,
            valid_args=["all", "everyone"],
            help=MentionsScanner.help(),
            intro_context="Mention usage",
        )

    async def init(self, message: discord.Message, *args: str) -> bool:
        self.top = 10
        for arg in args:
            if arg.isdigit():
                self.top = int(arg)
        # check other args
        self.all_mentions = "all" in args
        # Create mentions dict
        self.mentions = defaultdict(Counter)
        self.all_messages = "everyone" in args
        return True

    def compute_message(self, channel: ChannelLogs, message: MessageLog):
        return MentionsScanner.analyse_message(
            message,
            self.mentions,
            self.raw_members,
            all_mentions=self.all_mentions,
            all_messages=self.all_messages,
        )

    def get_results(self, intro: str) -> List[str]:
        names = [name for name in self.mentions]
        names.sort(key=lambda name: self.mentions[name].score(), reverse=True)
        names = names[: self.top]
        usage_count = Counter.total(self.mentions)
        res = [intro]
        res += [
            self.mentions[name].to_string(
                names.index(name),
                name,
                total_usage=usage_count,
                transform=lambda id: f" by {mention(id)}",
                top=len(self.members) != 1,
            )
            for name in names
        ]
        res += [
            f"Total: {plural(usage_count,'time')} ({precise(usage_count/self.msg_count)}/msg)"
        ]
        return res

    @staticmethod
    def analyse_message(
        message: MessageLog,
        mentions: Dict[str, Counter],
        raw_members: List[int],
        *,
        all_mentions: bool,
        all_messages: bool,
    ) -> bool:
        impacted = False
        # If author is included in the selection (empty list is all)
        if (
            (not message.bot or all_messages)
            and len(raw_members) == 0
            or message.author in raw_members
        ):
            impacted = True
            for member_id in message.mentions:
                name = mention(member_id)
                count = message.content.count(name) + message.content.count(
                    alt_mention(member_id)
                )
                mentions[name].update_use(count, message.created_at, message.author)
            if all_mentions:
                for role_id in message.role_mentions:
                    name = role_mention(role_id)
                    mentions[name].update_use(
                        message.content.count(name), message.created_at, message.author
                    )
                for channel_id in message.channel_mentions:
                    name = channel_mention(channel_id)
                    mentions[name].update_use(
                        message.content.count(name), message.created_at, message.author
                    )
                if "@everyone" in message.content:
                    mentions["@\u200beveryone"].update_use(
                        message.content.count("@everyone"),
                        message.created_at,
                        message.author,
                    )
                if "@here" in message.content:
                    mentions["@\u200bhere"].update_use(
                        message.content.count("@here"),
                        message.created_at,
                        message.author,
                    )
        return impacted