name: rust-ci
on: [ pull_request ]

# sccache enable for rust/C builds
env:
  SCCACHE_GHA_ENABLED: "true"
  RUSTC_WRAPPER: "sccache"

jobs:
  rust-ci-run:
    name: Run rust-clippy analyzing and tests
    runs-on: ubuntu-latest
    permissions:
      contents: read
    steps:
      # SETUP
      - uses: actions/checkout@v6
      - uses: dtolnay/rust-toolchain@stable
      - uses: Swatinem/rust-cache@v2
      - uses: mozilla-actions/sccache-action@v0.0.9

      # TESTS
      - name: Run tests
        run: cargo test --all-targets --all-features

      # CLIPPY
      - name: Run rust-clippy
        run: cargo clippy --all-targets --all-features -- -D warnings

use sedregex::ReplaceCommand;
use stacked_errors::{
	Result,
	StackableErr,
	bail,
};
use tgbot::types::{
	CallbackQuery,
	ChatMember,
	ChatUsername,
	GetChat,
	GetChatAdministrators,
	Message,
};
use url::Url;

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

/// Sends an informational message to the message's chat linking to the bot help channel.
pub async fn start (core: &Core, msg: &Message) -> Result<()> {
	core.tg.send(MyMessage::html_to(
		"We are open. Probably. Visit <a href=\"https://t.me/rsstg_bot_help/3\">channel</a>) for details.",
		msg.chat.get_id()
	)).await.stack()?;
	Ok(())
}

/// Send the sender's subscription list to the chat.
///
/// Retrieves the message sender's user ID, obtains their subscription list from `core`,
/// and sends the resulting reply into the message chat using MarkdownV2.
pub async fn list (core: &Core, msg: &Message) -> Result<()> {
	let sender = msg.sender.get_user_id()
		.stack_err("Ignoring unreal users.")?;
	let reply = core.list(sender).await.stack()?;
	core.tg.send(MyMessage::html_to(reply, msg.chat.get_id())).await.stack()?;
	Ok(())
}

pub async fn test (core: &Core, msg: &Message) -> Result<()> {
	let sender: i64 = msg.sender.get_user_id()
		.stack_err("Ignoring unreal users.")?.into();
	let feeds = core.get_feeds(sender).await.stack()?;
	let kb = get_kb(&Callback::menu(), feeds).await.stack()?;
	core.tg.send(MyMessage::html_to_kb("Main menu:", msg.chat.get_id(), kb)).await.stack()?;
	Ok(())
}

/// Handle channel-management commands that operate on a single numeric source ID.
///
/// This validates that exactly one numeric argument is provided, performs the requested
/// operation (check, clean, enable, delete, disable) against the database or core,

use crate::{
	Arc,
	command,
	Mutex,
	sql::Db,
	tg_bot::{
		Callback,
		MyMessage,
		Tg,
	},
};

use std::{
	borrow::Cow,

	StackableErr,
	anyhow,
	bail,
};
use tgbot::{
	handler::UpdateHandler,
	types::{
		CallbackQuery,
		ChatPeerId,
		Command,
		Update,
		UpdateType,
		UserPeerId,
	},
};
use ttl_cache::TtlCache;

lazy_static!{
	pub static ref RE_SPECIAL: Regex = Regex::new(r"([\-_*\[\]()~`>#+|{}\.!])").unwrap();
}









// This one does nothing except making sure only one token exists for each id
pub struct Token {
	running: Arc<Mutex<HashSet<i32>>>,
	my_id: i32,
}

impl Token {

		smol::block_on(async {
			let mut set = self.running.lock_arc().await;
			set.remove(&self.my_id);
		})
	}
}

pub type FeedList = HashMap<i32, String>;
type UserCache = TtlCache<i64, Arc<Mutex<FeedList>>>;

#[derive(Clone)]
pub struct Core {
	pub tg: Tg,
	pub db: Db,
	pub feeds: Arc<Mutex<UserCache>>,

								Ok(Some(source)) => source.to_string(),
								Ok(None) => "Source not found in database?".to_string(),
								Err(err) => format!("Failed to fetch source data:\n{err}"),
							}
						};
						smol::spawn(Compat::new(async move {
							if let Err(err) = clone.check(source_id, true, Some(last_scrape)).await
								&& let Err(err) = clone.tg.send(MyMessage::html(format!("🛑 {source}\n<pre>{}</pre>", &err.to_string()))).await
							{
								eprintln!("Check error: {err}");
							};
						})).detach();
					}
				} else if next_fetch - now < delay {
					delay = next_fetch - now;

		for row in conn.get_list(owner).await.stack()? {
			reply.push(row.to_string());
		};
		Ok(reply.join("\n\n"))
	}

	/// Returns current cached list of feed for requested user, or loads data from database
	pub async fn get_feeds (&self, owner: i64) -> Result<Arc<Mutex<FeedList>>> {
		let mut feeds = self.feeds.lock_arc().await;
		Ok(match feeds.get(&owner) {
			None => {
				let mut conn = self.db.begin().await.stack()?;
				let feed_list = conn.get_feeds(owner).await.stack()?;
				let mut map = HashMap::new();
				for feed in feed_list {

		}
		// in case we failed to found feed we need to remove - just reload everything from database
		if !dropped {
			self.get_feeds(owner).await.stack()?;
		}
		Ok(())
	}

	pub async fn cb (&self, query: &CallbackQuery, cb: &str) -> Result<()> {
		let cb: Callback = toml::from_str(cb).stack()?;
		todo!();
		Ok(())
	}
}

impl UpdateHandler for Core {
	/// Dispatches an incoming Telegram update to a matching command handler and reports handler errors to the originating chat.
	///
	/// This method inspects the update; if it contains a message that can be parsed as a bot command,
	/// it executes the corresponding command handler. If the handler returns an error, the error text
	/// is sent back to the message's chat using MarkdownV2 formatting. Unknown commands produce an error
	/// which is also reported to the chat.
	async fn handle (&self, update: Update) -> () {
		match update.update_type {
			UpdateType::Message(msg) => {
				if let Ok(cmd) = Command::try_from(*msg) {

					let msg = cmd.get_message();
					let words = cmd.get_args();
					let command = cmd.get_name();
					let res = match command {
						"/check" | "/clean" | "/enable" | "/delete" | "/disable" => command::command(self, command, msg, words).await,
						"/start" => command::start(self, msg).await,
						"/list" => command::list(self, msg).await,
						"/test" => command::test(self, msg).await,
						"/add" | "/update" => command::update(self, command, msg, words).await,
						any => Err(anyhow!("Unknown command: {any}")),
					};
					if let Err(err) = res 
						&& let Err(err2) = self.tg.send(MyMessage::html_to(
							format!("#error<pre>{err}</pre>"),
							msg.chat.get_id(),
						)).await
					{
						dbg!(err2);
					}
				} else {
					// not a command
				}
			},
			UpdateType::CallbackQuery(query) => {
				if let Some(ref cb) = query.data
					&& let Err(err) = self.cb(&query, cb).await
				{
					if let Err(err) = self.tg.answer_cb(query.id, err.to_string()).await {
						println!("{err:?}");
					}
				}
			},
			_ => {
				println!("Unhandled UpdateKind:\n{update:?}")
			},
		}
	}
}

	pub url: String,
	pub iv_hash: Option<String>,
	pub url_re: Option<String>,
}

impl fmt::Display for List {
	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> std::result::Result<(), fmt::Error> {
		write!(f, "#feed_{} *️⃣ <code>{}</code> {}\n🔗 <code>{}</code>", self.source_id, self.channel,
			match self.enabled {
				true  => "🔄 enabled",
				false => "⛔ disabled",
			}, self.url)?;
		if let Some(iv_hash) = &self.iv_hash {
			write!(f, "\nIV: <code>{iv_hash}</code>")?;
		}
		if let Some(url_re) = &self.url_re {
			write!(f, "\nRE: <code>{url_re}</code>")?;
		}
		Ok(())
	}
}

/// One feed, used for caching and menu navigation
#[derive(sqlx::FromRow, Debug)]

use crate::{
	Arc,
	Mutex,
	core::FeedList,
};

use std::{
	borrow::Cow,

	fmt,
};

use serde::{
	Deserialize,
	Serialize,
};
use stacked_errors::{
	bail,
	Result,
	StackableErr,
};
use tgbot::{
	api::Client,
	types::{
		AnswerCallbackQuery,
		Bot,
		ChatPeerId,
		GetBot,
		InlineKeyboardButton,
		InlineKeyboardMarkup,
		Message,
		ParseMode,
		SendMessage,
	},
};

const CB_VERSION: u8 = 0;

#[derive(Serialize, Deserialize, Debug)]
pub enum Callback {
	// Edit one feed (version, name)
	Edit(u8, String),
	// List all feeds (version, name to show, page number)
	List(u8, String, u8),
	// Show root menu (version)
	Menu(u8),
}

impl Callback {
	pub fn edit <S>(text: S) -> Callback
	where S: Into<String> {
		Callback::Edit(CB_VERSION, text.into())
	}

	pub fn list <S>(text: S, page: u8) -> Callback
	where S: Into<String> {
		Callback::List(CB_VERSION, text.into(), page)
	}

	pub fn menu () -> Callback {
		Callback::Menu(CB_VERSION)
	}

	fn version (&self) -> u8 {
		match self {
			Callback::Edit(version, .. ) => *version,
			Callback::List(version, .. ) => *version,
			Callback::Menu(version) => *version,
		}
	}
}

impl fmt::Display for Callback {
	fn fmt (&self, f: &mut fmt::Formatter) -> fmt::Result {
		f.write_str(&toml::to_string(self).map_err(|_| fmt::Error)?)
	}
}

/// Produce new Keyboard Markup from current Callback
pub async fn get_kb (cb: &Callback, feeds: Arc<Mutex<FeedList>>) -> Result<InlineKeyboardMarkup> {
	if cb.version() != CB_VERSION {
		bail!("Wrong callback version.");
	}
	let mark = match cb {
		Callback::Edit(_, _name) => { // XXX edit missing
			let kb: Vec<Vec<InlineKeyboardButton>> = vec![];
			InlineKeyboardMarkup::from(kb)
		},
		Callback::List(_, name, page) => {
			let mut kb = vec![];
			let feeds = feeds.lock_arc().await;
			let long = feeds.len() > 6;
			let (start, end) = if long {
				(page * 5 + 1, 5 + page * 5)
			} else {
				(0, 6)
			};
			let mut i = 0;
			if name.is_empty() {
				for (id, name) in feeds.iter() {


					i += 1;
					if i < start { continue }
					kb.push(vec![
						InlineKeyboardButton::for_callback_data(
							format!("{}. {}", id, name),
							Callback::edit(name).to_string()),
					]);
					if i > end { break }
				}
			} else {
				let mut found = false;
				let mut first_page = None;
				for (id, feed_name) in feeds.iter() {
					if name == feed_name {
						found = true;

						Callback::list("", if *page == 0 { *page } else { page - 1 } ).to_string()),
					InlineKeyboardButton::for_callback_data(">>",
						Callback::list("", page + 1).to_string()),
				]);
			}
			InlineKeyboardMarkup::from(kb)
		},
		Callback::Menu(_) => {
			let kb = vec![
				vec![
					InlineKeyboardButton::for_callback_data(
						"Add new channel",
						Callback::menu().to_string()), // new XXX
				],
				vec![
					InlineKeyboardButton::for_callback_data(
						"List channels",
						Callback::list("", 0).to_string()),
				],
			];
			InlineKeyboardMarkup::from(kb)
		},
	};
	Ok(mark)
}

pub enum MyMessage <'a> {
	Html { text: Cow<'a, str> },
	HtmlTo { text: Cow<'a, str>, to: ChatPeerId },
	HtmlToKb { text: Cow<'a, str>, to: ChatPeerId, kb: InlineKeyboardMarkup },


}

impl MyMessage <'_> {
	pub fn html <'a, S> (text: S) -> MyMessage<'a>
	where S: Into<Cow<'a, str>> {
		let text = text.into();
		MyMessage::Html { text }

	
	pub fn html_to_kb <'a, S> (text: S, to: ChatPeerId, kb: InlineKeyboardMarkup) -> MyMessage<'a>
	where S: Into<Cow<'a, str>> {
		let text = text.into();
		MyMessage::HtmlToKb { text, to, kb }
	}
	












	fn req (&self, tg: &Tg) -> Result<SendMessage> {
		Ok(match self {
			MyMessage::Html { text } =>
				SendMessage::new(tg.owner, text.as_ref())
					.with_parse_mode(ParseMode::Html),
			MyMessage::HtmlTo { text, to } =>
				SendMessage::new(*to, text.as_ref())
					.with_parse_mode(ParseMode::Html),
			MyMessage::HtmlToKb { text, to, kb } =>
				SendMessage::new(*to, text.as_ref())
					.with_parse_mode(ParseMode::Html)
					.with_reply_markup(kb.clone()),






		})
	}
}

#[derive(Clone)]
pub struct Tg {
	pub me: Bot,

	/// Send a text message to a chat, using an optional target and parse mode.
	///
	/// # Returns
	/// The sent `Message` on success.
	pub async fn send (&self, msg: MyMessage<'_>) -> Result<Message> {
		self.client.execute(msg.req(self)?).await.stack()
	}

	pub async fn answer_cb (&self, id: String, text: String) -> Result<bool> {
		self.client.execute(
			AnswerCallbackQuery::new(id)
				.with_text(text)
		).await.stack()
	}

	/// Create a copy of this `Tg` with the owner replaced by the given chat ID.
	///
	/// # Parameters
	/// - `owner`: The Telegram chat identifier to set as the new owner (expressed as an `i64`).
	///
	/// # Returns