use std::{future::Future, ops::Deref, pin::Pin};

use telers::{
    errors::HandlerError,
    event::{service::BoxFuture, telegram::HandlerResult, EventReturn},
    filters::{chat_type, CommandObject},
    methods::{BanChatMember, RestrictChatMember, SendMessage, UnbanChatMember},
    types::{ChatPermissions, Message},
    Bot,
};

use crate::{
    assets::files::{BAN_COMMAND_HELP, MUTE_COMMAND_HELP, UNBAN_COMMAND_HELP, UNMUTE_COMMAND_HELP},
    types::enums::{target_user::TargetUser, time_metrics::TimeDuration},
    utils::{
        general::get_expiration_time::get_expiration_date,
        telegram::{
            args_parser::{parse_args, Argument},
            member_rights::{demote_user, restrict},
            senders::send_html,
        },
    },
};

const USER_ID_NOT_FOUND: &str = "Для выполнение команды нужно знать ID пользователя, или ввести команду и выполнить её, ответив на сообщение пользователя";
const DEMOTE_ERROR: &str = "Невозможно снять привелегий администратора в силу того, что права были выданы одним из администраторов или основателем";

pub async fn admin_commands_endpoint(
    bot: Bot,
    message: Message,
    command_object: CommandObject,
) -> HandlerResult {
    let (command_type, args) = (command_object.command.deref(), command_object.args.deref());

    if let Some(args) = parse_args(args, &message, command_type) {
        match command_type {
            "ban" => {
                let ban_callback = async |chat_id: i64, user_id: i64| {
                    bot.send(BanChatMember::new(chat_id, user_id)).await?;
                    Ok(EventReturn::Finish)
                };

                execute_command(&bot, &message, ban_callback, args).await?;
            }
            "unban" => {
                let unban_callback = async |chat_id: i64, user_id: i64| {
                    bot.send(UnbanChatMember::new(chat_id, user_id)).await?;
                    Ok(EventReturn::Finish)
                };
                execute_command(&bot, &message, unban_callback, args).await?;
            }
            "mute" => {
                let duration = if let Some(Argument::Time(duration)) = args.get(1) {
                    get_expiration_date(*duration)
                } else {
                    bot.send(SendMessage::new(
                        message.chat().id(),
                        "Не указана длительность мута.",
                    ))
                    .await?;
                    return Err(HandlerError::from_display("Mute duration is not defined"));
                };
                let mute_callback = async |chat_id: i64, user_id: i64| {
                    restrict(&bot, user_id, duration, chat_id).await?;
                    Ok(EventReturn::Finish)
                };
                execute_command(&bot, &message, mute_callback, args).await?;
            }
            "unmute" => {
                let unmute_callback = async |chat_id: i64, user_id: i64| {
                    bot.send(RestrictChatMember::new(
                        chat_id,
                        user_id,
                        ChatPermissions::new(),
                    ))
                    .await?;
                    Ok(EventReturn::Finish)
                };
                execute_command(&bot, &message, unmute_callback, args).await?;
            }
            _ => unreachable!(),
        };
    } else {
        let help_txt = match command_type {
            "ban" => BAN_COMMAND_HELP,
            "mute" => MUTE_COMMAND_HELP,
            "unban" => UNBAN_COMMAND_HELP,
            "unmute" => UNMUTE_COMMAND_HELP,
            _ => unreachable!(),
        };

        send_html(&bot, &message, help_txt).await?;
    }
    Ok(EventReturn::Finish)
}

pub async fn execute_command(
    bot: &Bot,
    message: &Message,
    command: impl AsyncFnOnce(i64, i64) -> HandlerResult + Copy,
    command_args: Vec<Argument>,
) -> HandlerResult {
    let chat_id = message.chat().id();

    if let Some(Argument::User(user)) = command_args.first() {
        if let TargetUser::None = user {
            bot.send(SendMessage::new(chat_id, USER_ID_NOT_FOUND))
                .await?;
            return Err(HandlerError::from_display("Can't find user ID"));
        }

        let (user_name, user_id) = (
            user.get_user_name(bot, message).await.unwrap(),
            user.get_id().unwrap(),
        );

        if command(user_id, chat_id).await.is_err() {
            if demote_user(bot, user_id, chat_id).await.is_err() {
                bot.send(SendMessage::new(chat_id, DEMOTE_ERROR)).await?;
                return Err(HandlerError::from_display("Can't demote chat member because he has permission that he got from another admin/chat owner"));
            }
            command(user_id, chat_id).await?;
        } else {
            bot.send(SendMessage::new(chat_id, "Command executed successful!"))
                .await?;
        }
        Ok(EventReturn::Finish)
    } else {
        unreachable!()
    }
}