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use crate::core::Core;

use anyhow::{
	anyhow,
	bail,
	Context,
	Result,
};
use lazy_static::lazy_static;
use regex::Regex;
use sedregex::ReplaceCommand;
use stacked_errors::{
	Result,
	StackableErr,
	bail,
};
use tgbot::types::{
	ChatMember,
	ChatUsername,
	GetChat,
	GetChatAdministrators,
	Message,
	ParseMode::MarkdownV2,
};

lazy_static! {
	static ref RE_USERNAME: Regex = Regex::new(r"^@([a-zA-Z][a-zA-Z0-9_]+)$").unwrap();
	static ref RE_LINK: Regex = Regex::new(r"^https?://[a-zA-Z.0-9-]+/[-_a-zA-Z.:0-9/?=]+$").unwrap();
	static ref RE_IV_HASH: Regex = Regex::new(r"^[a-f0-9]{14}$").unwrap();
}

pub async fn start (core: &Core, msg: &Message) -> Result<()> {
	core.send("We are open\\. Probably\\. Visit [channel](https://t.me/rsstg_bot_help/3) for details\\.",
		Some(msg.chat.get_id()), Some(MarkdownV2)).await?;
		Some(msg.chat.get_id()), Some(MarkdownV2)).await.stack()?;
	Ok(())
}

pub async fn list (core: &Core, msg: &Message) -> Result<()> {
	let sender = msg.sender.get_user_id()
		.ok_or(anyhow!("Ignoring unreal users."))?;
	let reply = core.list(sender).await?;
	core.send(reply, Some(msg.chat.get_id()), Some(MarkdownV2)).await?;
		.stack_err("Ignoring unreal users.")?;
	let reply = core.list(sender).await.stack()?;
	core.send(reply, Some(msg.chat.get_id()), Some(MarkdownV2)).await.stack()?;
	Ok(())
}

pub async fn command (core: &Core, command: &str, msg: &Message, words: &[String]) -> Result<()> {
	let mut conn = core.db.begin().await?;
	let mut conn = core.db.begin().await.stack()?;
	let sender = msg.sender.get_user_id()
		.ok_or(anyhow!("Ignoring unreal users."))?;
		.stack_err("Ignoring unreal users.")?;
	let reply = if words.len() == 1 {
		match words[0].parse::<i32>() {
			Err(err) => format!("I need a number.\n{}", &err).into(),
			Ok(number) => match command {
				"/check" => core.check(number, false).await
					.context("Channel check failed.")?.into(),
				"/clean" => conn.clean(number, sender).await?,
				"/enable" => conn.enable(number, sender).await?.into(),
				"/delete" => conn.delete(number, sender).await?,
				"/disable" => conn.disable(number, sender).await?.into(),
				"/clean" => conn.clean(number, sender).await.stack()?,
				"/enable" => conn.enable(number, sender).await.stack()?.into(),
				"/delete" => conn.delete(number, sender).await.stack()?,
				"/disable" => conn.disable(number, sender).await.stack()?.into(),
				_ => bail!("Command {command} {words:?} not handled."),
			},
		}
	} else {
		"This command needs exacly one number.".into()
	};
	core.send(reply, Some(msg.chat.get_id()), None).await?;
	core.send(reply, Some(msg.chat.get_id()), None).await.stack()?;
	Ok(())
}

pub async fn update (core: &Core, command: &str, msg: &Message, words: &[String]) -> Result<()> {
	let sender = msg.sender.get_user_id()
		.ok_or(anyhow!("Ignoring unreal users."))?;
		.stack_err("Ignoring unreal users.")?;
	let mut source_id: Option<i32> = None;
	let at_least = "Requires at least 3 parameters.";
	let mut i_words = words.iter();
	match command {
		"/update" => {
			let next_word = i_words.next().context(at_least)?;
			source_id = Some(next_word.parse::<i32>()
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					Some(thing)
				}
			}
		},
		None => None,
	};
	let chat_id = ChatUsername::from(channel.as_ref());
	let channel_id = core.tg.execute(GetChat::new(chat_id.clone())).await?.id;
	let channel_id = core.tg.execute(GetChat::new(chat_id.clone())).await.stack_err("gettting GetChat")?.id;
	let chan_adm = core.tg.execute(GetChatAdministrators::new(chat_id)).await
		.context("Sorry, I have no access to that chat.")?;
	let (mut me, mut user) = (false, false);
	for admin in chan_adm {
		let member_id = match admin {
			ChatMember::Creator(member) => member.user.id,
			ChatMember::Administrator(member) => member.user.id,
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		}
		if member_id == sender {
			user = true;
		}
	};
	if ! me   { bail!("I need to be admin on that channel."); };
	if ! user { bail!("You should be admin on that channel."); };
	let mut conn = core.db.begin().await?;
	core.send(conn.update(source_id, channel, channel_id, url, iv_hash, url_re, sender).await?, Some(msg.chat.get_id()), None).await?;
	let mut conn = core.db.begin().await.stack()?;
	core.send(conn.update(source_id, channel, channel_id, url, iv_hash, url_re, sender).await.stack()?, Some(msg.chat.get_id()), None).await.stack()?;
	Ok(())
}