use super::RpcHandler;
use crate::vpn;
use anyhow::Result;
use tracing::info;

impl RpcHandler {
    /// vpn.status — Get current VPN connection status.
    pub(super) async fn handle_vpn_status(&self) -> Result<serde_json::Value> {
        let status = vpn::get_status().await;
        let config = vpn::load_config(&self.config.data_dir).await?;

        Ok(serde_json::json!({
            "connected": status.connected,
            "provider": status.provider,
            "interface": status.interface,
            "ip_address": status.ip_address,
            "hostname": status.hostname,
            "peers_connected": status.peers_connected,
            "bytes_in": status.bytes_in,
            "bytes_out": status.bytes_out,
            "configured": config.enabled,
            "configured_provider": format!("{:?}", config.provider).to_lowercase(),
        }))
    }

    /// vpn.configure — Configure VPN (Tailscale or WireGuard).
    pub(super) async fn handle_vpn_configure(
        &self,
        params: Option<serde_json::Value>,
    ) -> Result<serde_json::Value> {
        let params = params.ok_or_else(|| anyhow::anyhow!("Missing params"))?;
        let provider = params
            .get("provider")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow::anyhow!("Missing 'provider' (tailscale or wireguard)"))?;

        match provider {
            "tailscale" => {
                let auth_key = params
                    .get("auth_key")
                    .and_then(|v| v.as_str())
                    .ok_or_else(|| anyhow::anyhow!("Missing 'auth_key' for Tailscale"))?;

                vpn::configure_tailscale(auth_key, &self.config.data_dir).await?;
                info!("Tailscale VPN configured");

                Ok(serde_json::json!({
                    "configured": true,
                    "provider": "tailscale",
                }))
            }
            "wireguard" => {
                let address = params
                    .get("address")
                    .and_then(|v| v.as_str())
                    .unwrap_or("10.0.0.1/24");
                let dns = params
                    .get("dns")
                    .and_then(|v| v.as_str())
                    .unwrap_or("1.1.1.1");

                let peer = if let Some(peer_obj) = params.get("peer") {
                    let public_key = peer_obj
                        .get("public_key")
                        .and_then(|v| v.as_str())
                        .ok_or_else(|| anyhow::anyhow!("Missing peer public_key"))?;
                    let endpoint = peer_obj
                        .get("endpoint")
                        .and_then(|v| v.as_str())
                        .ok_or_else(|| anyhow::anyhow!("Missing peer endpoint"))?;
                    let allowed_ips = peer_obj
                        .get("allowed_ips")
                        .and_then(|v| v.as_str())
                        .unwrap_or("0.0.0.0/0");
                    let keepalive = peer_obj
                        .get("persistent_keepalive")
                        .and_then(|v| v.as_u64())
                        .map(|v| v as u16);

                    Some(vpn::WireGuardPeer {
                        public_key: public_key.to_string(),
                        endpoint: endpoint.to_string(),
                        allowed_ips: allowed_ips.to_string(),
                        persistent_keepalive: keepalive,
                    })
                } else {
                    None
                };

                let wg_config = vpn::configure_wireguard(
                    &self.config.data_dir,
                    address,
                    dns,
                    peer,
                )
                .await?;

                info!("WireGuard VPN configured");
                Ok(serde_json::json!({
                    "configured": true,
                    "provider": "wireguard",
                    "public_key": wg_config.public_key,
                    "address": wg_config.address,
                }))
            }
            _ => {
                anyhow::bail!("Unknown provider: {} (expected tailscale or wireguard)", provider);
            }
        }
    }

    /// remote.setup — One-click Tailscale remote access setup.
    /// Accepts an auth key, configures Tailscale, and restricts access to ports 80/443.
    pub(super) async fn handle_remote_setup(
        &self,
        params: Option<serde_json::Value>,
    ) -> Result<serde_json::Value> {
        let params = params.ok_or_else(|| anyhow::anyhow!("Missing params"))?;
        let auth_key = params
            .get("auth_key")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow::anyhow!("Missing 'auth_key' — get one from https://login.tailscale.com/admin/settings/keys"))?;

        // Configure Tailscale
        vpn::configure_tailscale(auth_key, &self.config.data_dir).await?;
        info!("Remote access: Tailscale configured");

        // Set ACL-like port restrictions via iptables on tailscale0
        // Allow only HTTP (80) and HTTPS (443) on the Tailscale interface
        let restrict_cmds = [
            "sudo iptables -D INPUT -i tailscale0 -p tcp --dport 80 -j ACCEPT 2>/dev/null; true",
            "sudo iptables -D INPUT -i tailscale0 -p tcp --dport 443 -j ACCEPT 2>/dev/null; true",
            "sudo iptables -D INPUT -i tailscale0 -j DROP 2>/dev/null; true",
            "sudo iptables -A INPUT -i tailscale0 -p tcp --dport 80 -j ACCEPT",
            "sudo iptables -A INPUT -i tailscale0 -p tcp --dport 443 -j ACCEPT",
            "sudo iptables -A INPUT -i tailscale0 -p tcp -m state --state ESTABLISHED,RELATED -j ACCEPT",
            "sudo iptables -A INPUT -i tailscale0 -j DROP",
        ];

        for cmd in &restrict_cmds {
            let _ = tokio::process::Command::new("sh")
                .arg("-c")
                .arg(cmd)
                .output()
                .await;
        }
        info!("Remote access: Restricted Tailscale to ports 80/443");

        // Get the Tailscale IP for display
        let status = vpn::get_status().await;
        let tailscale_ip = status.ip_address.clone().unwrap_or_default();
        let hostname = status.hostname.clone().unwrap_or_default();

        // Build the remote access URL
        let remote_url = if !hostname.is_empty() {
            format!("http://{}", hostname)
        } else if !tailscale_ip.is_empty() {
            format!("http://{}", tailscale_ip)
        } else {
            String::new()
        };

        Ok(serde_json::json!({
            "configured": true,
            "provider": "tailscale",
            "tailscale_ip": tailscale_ip,
            "hostname": hostname,
            "remote_url": remote_url,
            "ports_exposed": [80, 443],
        }))
    }

    /// vpn.disconnect — Disable VPN.
    pub(super) async fn handle_vpn_disconnect(&self) -> Result<serde_json::Value> {
        let mut config = vpn::load_config(&self.config.data_dir).await?;
        config.enabled = false;
        vpn::save_config(&self.config.data_dir, &config).await?;

        // Try to bring down the interface
        match config.provider {
            vpn::VpnProvider::Tailscale => {
                let _ = tokio::process::Command::new("podman")
                    .args(["exec", "tailscale", "tailscale", "down"])
                    .output()
                    .await;
            }
            vpn::VpnProvider::Wireguard => {
                let _ = tokio::process::Command::new("wg-quick")
                    .args(["down", "wg0"])
                    .output()
                    .await;
            }
        }

        info!("VPN disconnected");
        Ok(serde_json::json!({ "disconnected": true }))
    }
}