small-bin 1.0.4

use crate::{
    config::AppConfig,
    database::{Database, History, QueueItem},
    notification::notification,
    utils, *,
};
use anyhow::{Context, Result};
use ssh2::Session;
use std::{fs::File, io::BufReader, net::TcpStream, path::Path, sync::Arc, time::Duration};
use tokio::{sync::mpsc, time};

#[derive(Debug)]
pub struct SftpManager {
    config: Arc<AppConfig>,
    database: Arc<Database>,
}


impl SftpManager {
    pub fn new(
        config: Arc<AppConfig>,
        database: Arc<Database>,
    ) -> (Self, mpsc::UnboundedReceiver<()>) {
        let (_tx, rx) = mpsc::unbounded_channel();
        (
            SftpManager {
                config,
                database,
            },
            rx,
        )
    }


    pub async fn start(self: Arc<Self>) {
        let mut interval =
            time::interval(Duration::from_millis(self.config.fs_check_interval));

        info!(
            "Starting SFTP queue processor with check interval: {}ms",
            self.config.fs_check_interval
        );

        loop {
            interval.tick().await;
            if let Err(e) = self.process_queue().await {
                error!("Error processing queue: {e:?}");
            }
        }
    }


    async fn process_queue(&self) -> Result<()> {
        let queue = self.database.get_queue()?;
        if !queue.is_empty() {
            // Build clipboard content
            self.build_clipboard(&queue)?;

            // Process each queue item
            for item in &queue {
                if let Err(e) = self.process_element(item).await {
                    error!("Error processing queue element: {e:?}");
                }
            }
        }
        Ok(())
    }


    fn build_clipboard(&self, queue: &[QueueItem]) -> Result<()> {
        if let Some(item) = queue.last() {
            let config = self
                .config
                .select_config()
                .expect("One of configs should always be selected!");
            let content = format!(
                "{}{}{}",
                config.address,
                item.uuid,
                file_extension(&item.local_file)
            );

            put_to_clipboard(&content)?;

            if self.config.notifications.clipboard {
                let _ = notification(
                    "Link copied to clipboard",
                    "clipboard",
                    &self.config.notifications,
                    &self.config.sounds,
                );
            }
        }

        Ok(())
    }


    async fn process_element(&self, item: &QueueItem) -> Result<()> {
        let path = Path::new(&item.local_file);

        // Check if file exists and is regular
        if !path.exists() || !path.is_file() {
            debug!(
                "Local file not found or not a regular file: {}. Skipping.",
                item.local_file
            );
            self.database.remove_from_queue(&item.uuid)?;
            return Ok(());
        }

        // Check for temp file pattern
        if TEMP_PATTERN.is_match(&item.local_file) {
            debug!("File matches temp pattern, skipping: {}", item.local_file);
            self.database.remove_from_queue(&item.uuid)?;
            return Ok(());
        }

        // Upload file
        let remote_file = format!("{}{}", item.remote_file, file_extension(&item.local_file));
        self.send_file(&item.local_file, &remote_file).await?;

        // Add to history
        self.add_to_history(item)?;

        // Remove from queue
        self.database.remove_from_queue(&item.uuid)?;

        Ok(())
    }


    async fn send_file(&self, local_file: &str, remote_file: &str) -> Result<()> {
        let config = &self
            .config
            .select_config()
            .expect("One of configs should always be selected!");

        // Connect via SSH
        let tcp = TcpStream::connect(format!("{}:{}", config.hostname, config.ssh_port))
            .context("Failed to connect to SSH server")?;
        tcp.set_read_timeout(Some(Duration::from_millis(
            self.config.ssh_connection_timeout,
        )))?;
        tcp.set_write_timeout(Some(Duration::from_millis(
            self.config.ssh_connection_timeout,
        )))?;

        let mut sess = Session::new()?;
        sess.set_tcp_stream(tcp);
        sess.handshake()?;

        // Authenticate
        let ssh_private_key = if config.ssh_key.is_empty() {
            ".ssh/id_ed25519"
        } else {
            &config.ssh_key
        };

        sess.userauth_pubkey_file(
            &config.username,
            None,
            Path::new(&home::home_dir().expect("Home dir has to be set!"))
                .join(ssh_private_key)
                .as_path(),
            if config.ssh_key_pass.is_empty() {
                None
            } else {
                Some(&config.ssh_key_pass)
            },
        )?;

        if !sess.authenticated() {
            anyhow::bail!("SSH authentication failed");
        }

        debug!("SSH connection established");

        // Start SFTP session
        let sftp = sess.sftp()?;
        debug!("SFTP session started");

        // Check remote file
        let local_size = local_file_size(local_file)?;
        let remote_size = sftp
            .stat(Path::new(remote_file))
            .map(|stat| stat.size.unwrap_or(0))
            .unwrap_or(0);

        debug!(
            "Local file: {local_file} ({local_size}); Remote file: {remote_file} ({remote_size})"
        );

        if remote_size > 0 && remote_size == local_size {
            info!("Found file of same size already uploaded. Skipping");
            return Ok(());
        }

        // Upload file
        let mut local = BufReader::new(File::open(local_file)?);
        let mut remote = sftp.create(Path::new(remote_file))?;

        stream_file_to_remote(
            &mut local,
            &mut remote,
            self.config.sftp_buffer_size,
            local_size,
        )?;

        if self.config.notifications.upload {
            let _ = notification(
                "Uploaded successfully.",
                "upload",
                &self.config.notifications,
                &self.config.sounds,
            );
        }
        Ok(())
    }


    fn add_to_history(&self, queue_item: &QueueItem) -> Result<()> {
        let config = self
            .config
            .select_config()
            .expect("One of configs should always be selected!");
        let content = format!(
            "{}{}{}",
            config.address,
            queue_item.uuid,
            file_extension(&queue_item.local_file)
        );

        // Check if already in history
        let history = self.database.get_history(None)?;
        let exists = history.iter().any(|h| h.content.contains(&content));

        if !exists {
            let history_item = History {
                content,
                timestamp: chrono::Local::now().timestamp(),
                file: queue_item.local_file.clone(),
                uuid: uuid::Uuid::new_v4().to_string(),
            };
            self.database.add_history(&history_item)?;
        }

        Ok(())
    }
}