[package]
name = "rsstg"
version = "0.1.9"
authors = ["arcade"]
edition = "2018"

[dependencies]
chrono = "*"
config = "*"
futures = "*"

	FOREIGN KEY (source_id) REFERENCES rsstg_source(source_id)
);
create unique index rsstg_post__url on rsstg_post(url);
create index rsstg_post__hour on rsstg_post(hour);
create index rsstg_post__posted_hour on rsstg_post(posted,hour);

create or replace view rsstg_order as
	select source_id, coalesce(last_scrape + make_interval(0,0,0,0,0,(60 / (coalesce(activity, 1)/7 + 1) )::integer), now() - interval '1 minute') as next_fetch, owner
		from rsstg_source natural left join
		(select source_id, count(*) as activity
			from rsstg_post where 
				hour = extract('hour' from now())::smallint
				and posted > now() - interval '7 days'
			group by source_id) as act
		where enabled

	}

	fn debug(&self, msg: &str) -> Result<()> {
		self.tg.spawn(SendMessage::new(self.owner_chat, msg));
		Ok(())
	}

	async fn check<S>(&self, id: &i32, owner: S, real: bool) -> Result<()>
	where S: Into<i64> {
		let owner: i64 = owner.into();
		let mut conn = self.pool.acquire().await
			.with_context(|| format!("🛑 Query queue fetch conn:\n{:?}", &self.pool))?;
		let row = sqlx::query("select source_id, channel_id, url, iv_hash, owner from rsstg_source where source_id = $1 and owner = $2")
			.bind(id)
			.bind(owner)
			.fetch_one(&mut conn).await
			.with_context(|| format!("🛑 Query source:\n{:?}", &self.pool))?;
		drop(conn);
		let channel_id: i64 = row.try_get("channel_id")?;
		let destination = match real {
			true => UserId::new(channel_id),
			false => UserId::new(row.try_get("owner")?),

		sqlx::query("update rsstg_source set last_scrape = now() where source_id = $1;")
			.bind(id)
			.execute(&mut conn).await
			.with_context(|| format!("🛑 Update scrape:\n{:?}", &conn))?;
		Ok(())
	}

	async fn clean<S>(&self, source_id: &i32, id: S) -> Result<String>
	where S: Into<i64> {
		let id: i64 = id.into();
		let mut conn = self.pool.acquire().await
			.with_context(|| format!("🛑 Clean fetch conn:\n{:?}", &self.pool))?;
		match sqlx::query("delete from rsstg_post p using rsstg_source s where p.source_id = $1 and owner = $2 and p.source_id = s.source_id;")
			.bind(source_id)
			.bind(id)
			.execute(&mut conn).await
			.with_context(|| format!("🛑 Clean seen posts:\n{:?}", &self.pool))?
			.rows_affected() {
			0 => { Ok("No data found found\\.".to_string()) },
			x => { Ok(format!("{} posts purged\\.", x)) },
		}
	}

	async fn enable<S>(&self, source_id: &i32, id: S) -> Result<&str>
	where S: Into<i64> {
		let id: i64 = id.into();
		let mut conn = self.pool.acquire().await
			.with_context(|| format!("🛑 Enable fetch conn:\n{:?}", &self.pool))?;
		match sqlx::query("update rsstg_source set enabled = true where source_id = $1 and owner = $2")
			.bind(source_id)
			.bind(id)
			.execute(&mut conn).await
			.with_context(|| format!("🛑 Enable source:\n\n{:?}", &self.pool))?
			.rows_affected() {
			1 => { Ok("Source disabled\\.") },
			0 => { Ok("Source not found\\.") },
			_ => { Err(anyhow!("Database error.")) },
		}
	}

	async fn disable<S>(&self, source_id: &i32, id: S) -> Result<&str>
	where S: Into<i64> {
		let id: i64 = id.into();
		let mut conn = self.pool.acquire().await
			.with_context(|| format!("🛑 Disable fetch conn:\n{:?}", &self.pool))?;
		match sqlx::query("update rsstg_source set enabled = false where source_id = $1 and owner = $2")
			.bind(source_id)
			.bind(id)
			.execute(&mut conn).await
			.with_context(|| format!("🛑 Disable source:\n\n{:?}", &self.pool))?
			.rows_affected() {
			1 => { Ok("Source disabled\\.") },
			0 => { Ok("Source not found\\.") },
			_ => { Err(anyhow!("Database error.")) },
		}
	}

	async fn autofetch(&self) -> Result<()> {
		let mut delay = chrono::Duration::minutes(5);
		let mut now;
		loop {
			let mut conn = self.pool.acquire().await
				.with_context(|| format!("🛑 Autofetch fetch conn:\n{:?}", &self.pool))?;
			now = chrono::Local::now();
			let mut queue = sqlx::query("select source_id, next_fetch, owner from rsstg_order natural left join rsstg_source natural left join rsstg_channel where next_fetch < now();")
				.fetch_all(&mut conn).await?;
			for row in queue.iter() {
				let source_id: i32 = row.try_get("source_id")?;
				let owner: i64 = row.try_get("owner")?;
				let next_fetch: DateTime<chrono::Local> = row.try_get("next_fetch")?;
				if next_fetch < now {
					sqlx::query("update rsstg_source set last_scrape = now() + interval '1 hour' where source_id = $1;")
						.bind(source_id)
						.execute(&mut conn).await
						.with_context(|| format!("🛑 Lock source:\n\n{:?}", &self.pool))?;
					let clone = self.clone();
					tokio::spawn(async move {
						if let Err(err) = clone.check(&source_id, owner, true).await {
							if let Err(err) = clone.debug(&err.to_string()) {
								eprintln!("Check error: {}", err);
							};
						};
					});
				} else {
					if next_fetch - now < delay {
						delay = next_fetch - now;
					}
				}
			};
			queue.clear();
			tokio::time::delay_for(delay.to_std()?).await;
			delay = chrono::Duration::minutes(5);
		}
	}

	async fn list(&self, id: telegram_bot::UserId) -> Result<Vec<String>> {
		let id = i64::from(id);
		let mut reply = vec![];
		let mut conn = self.pool.acquire().await
			.with_context(|| format!("🛑 List fetch conn:\n{:?}", &self.pool))?;
		reply.push("Channels:".to_string());
		let rows = sqlx::query("select source_id, username, enabled, url, iv_hash from rsstg_source left join rsstg_channel using (channel_id) where owner = $1 order by source_id")
			.bind(id)
			.fetch_all(&mut conn).await?;
		for row in rows.iter() {
			let source_id: i32 = row.try_get("source_id")?;
			let username: &str = row.try_get("username")?;
			let enabled: bool = row.try_get("enabled")?;
			let url: &str = row.try_get("url")?;
			let iv_hash: Option<&str> = row.try_get("iv_hash")?;
			reply.push(format!("\n\\#️⃣ {} \\*️⃣ `{}` {}\n🔗 `{}`", source_id, username,  
				match enabled {
					true  => "🔄 enabled",
					false => "⛔ disabled",
				}, url));
			if let Some(hash) = iv_hash {
				reply.push(format!("IV `{}`", hash));
			}
		};
		Ok(reply)
	}
}

#[tokio::main]
async fn main() -> Result<()> {
	let mut settings = config::Config::default();
	settings.merge(config::File::with_name("rsstg"))?;

						"/start" => {
							reply.push("We are open\\. Probably\\. Visit [channel](https://t.me/rsstg_bot_help/3) for details\\.".to_string());
						},

// list

						"/list" => {







							reply.append(&mut core.list(message.from.id).await?);



















						},

// add

						"/add" | "/update" => {
							let mut source_id: i32 = 0;
							if cmd == "/update" {

						"/check" => {
							match &words.next().unwrap().parse::<i32>() {
								Err(err) => {
									reply.push(format!("I need a number\\.\n{}", &err));
								},
								Ok(number) => {
									core.check(&number, message.from.id, false).await




										.context("🛑 Channel check failed.")?;


								},
							};
						},

// clean

						"/clean" => {



							match &words.next().unwrap().parse::<i32>() {
								Err(err) => {
									reply.push(format!("I need a number\\.\n{}", &err));
								},
								Ok(number) => {
									let result = core.clean(&number, message.from.id).await?;
									reply.push(result.to_string());
								},
							};
						},

// enable

						"/enable" => {
							match &words.next().unwrap().parse::<i32>() {
								Err(err) => {