rport 0.2.51

use anyhow::{anyhow, Result};
use rustrtc::IceServer;
use serde::{Deserialize, Serialize};

use crate::cli::Cli;

#[derive(Debug, Deserialize, Serialize, Clone)]
pub struct IceServerConfig {
    pub urls: Vec<String>,
    pub username: Option<String>,
    pub credential: Option<String>,
}

impl Default for IceServerConfig {
    fn default() -> Self {
        Self {
            urls: vec!["stun:restsend.com:3478".to_string()],
            username: None,
            credential: None,
        }
    }
}

impl From<IceServerConfig> for IceServer {
    fn from(config: IceServerConfig) -> Self {
        IceServer {
            urls: config.urls,
            username: config.username,
            credential: config.credential,
            ..Default::default()
        }
    }
}

#[derive(Debug, Clone)]
pub struct ForwardMapping {
    pub local_port: Option<u16>,
    pub host: String,
    pub port: u16,
}

impl ForwardMapping {
    pub fn is_proxy_command(&self) -> bool {
        self.local_port.is_none()
    }
}

#[derive(Debug, Deserialize, Serialize, Clone)]
pub struct RportConfig {
    pub server: Option<String>,
    pub token: Option<String>,
    pub ice_servers: Option<Vec<IceServerConfig>>,
    pub log_file: Option<String>,
    pub connect_timeout: Option<u32>,
    pub upnp: Option<bool>,
    // Advanced WebRTC / SCTP tuning
    pub ice_disconnect_threshold: Option<u64>,
    pub ice_disconnect_grace: Option<u64>,
    pub ice_connection_timeout: Option<u64>,
    pub sctp_rto_initial_ms: Option<u64>,
    pub sctp_rto_min_ms: Option<u64>,
    pub sctp_rto_max_sec: Option<u64>,
    pub sctp_max_association_retransmits: Option<u32>,
    pub sctp_receive_window_kb: Option<usize>,
}

impl Default for RportConfig {
    fn default() -> Self {
        Self {
            server: None,
            token: None,
            ice_servers: None,
            log_file: None,
            connect_timeout: Some(30),
            upnp: Some(true),
            ice_disconnect_threshold: None,
            ice_disconnect_grace: None,
            ice_connection_timeout: None,
            sctp_rto_initial_ms: None,
            sctp_rto_min_ms: None,
            sctp_rto_max_sec: None,
            sctp_max_association_retransmits: None,
            sctp_receive_window_kb: None,
        }
    }
}

impl RportConfig {
    pub fn load_from_file(path: &std::path::PathBuf) -> Result<Self> {
        if !path.exists() {
            return Ok(Self::default());
        }
        let content = std::fs::read_to_string(path)?;
        let config: RportConfig = toml::from_str(&content)?;
        Ok(config)
    }

    pub fn load_default() -> Result<Self> {
        let home_dir =
            home::home_dir().ok_or_else(|| anyhow!("Could not determine home directory"))?;
        let config_path = home_dir.join(".rport.toml");
        Self::load_from_file(&config_path)
    }

    pub fn merge_with_cli(&mut self, cli: Cli) -> Vec<ForwardMapping> {
        if let Some(token) = cli.token {
            self.token = Some(token);
        }
        if let Some(server) = cli.server {
            self.server = Some(server);
        }
        if let Some(connect_timeout) = cli.timeout {
            self.connect_timeout = Some(connect_timeout);
        }
        if let Some(log_file) = cli.log_file {
            self.log_file = Some(log_file.to_string_lossy().to_string());
        }
        self.upnp = Some(cli.upnp);

        // Parse -L forward specs
        let forwards: Vec<ForwardMapping> = cli
            .forward
            .iter()
            .filter_map(|f| parse_forward_spec(f).ok())
            .collect();

        forwards
    }
}

fn parse_forward_spec(spec: &str) -> Result<ForwardMapping> {
    let parts: Vec<&str> = spec.split(':').collect();
    match parts.len() {
        1 => {
            // -L port  →  shorthand for -L 127.0.0.1:port (ProxyCommand)
            let port: u16 = parts[0].parse()?;
            Ok(ForwardMapping {
                local_port: None,
                host: "127.0.0.1".to_string(),
                port,
            })
        }
        2 => {
            // -L local_port:remote_port  (port forward, host=127.0.0.1)
            // or -L host:port (ProxyCommand)
            if let Ok(local_port) = parts[0].parse::<u16>() {
                let remote_port: u16 = parts[1].parse()?;
                Ok(ForwardMapping {
                    local_port: Some(local_port),
                    host: "127.0.0.1".to_string(),
                    port: remote_port,
                })
            } else {
                // ProxyCommand: host:port
                let remote_port: u16 = parts[1].parse()?;
                Ok(ForwardMapping {
                    local_port: None,
                    host: parts[0].to_string(),
                    port: remote_port,
                })
            }
        }
        3 => {
            // -L local_port:host:port
            let local_port: u16 = parts[0].parse()?;
            let host = parts[1].to_string();
            let remote_port: u16 = parts[2].parse()?;
            Ok(ForwardMapping {
                local_port: Some(local_port),
                host,
                port: remote_port,
            })
        }
        _ => Err(anyhow!(
            "Invalid -L format: {}. Use port, host:port, local_port:port, or local_port:host:port",
            spec
        )),
    }
}