use super::RpcHandler;
use crate::network::dns;
use anyhow::{Context, Result};
use tracing::debug;

impl RpcHandler {
    /// network.list-interfaces — list all network interfaces with IP, MAC, status.
    pub(super) async fn handle_network_list_interfaces(&self) -> Result<serde_json::Value> {
        debug!("Listing network interfaces");
        let interfaces = list_interfaces().await?;
        Ok(serde_json::json!({ "interfaces": interfaces }))
    }

    /// network.scan-wifi — scan for available WiFi networks.
    pub(super) async fn handle_network_scan_wifi(&self) -> Result<serde_json::Value> {
        debug!("Scanning WiFi networks");
        let networks = scan_wifi().await?;
        Ok(serde_json::json!({ "networks": networks }))
    }

    /// network.configure-wifi — connect to a WiFi network.
    pub(super) async fn handle_network_configure_wifi(
        &self,
        params: Option<serde_json::Value>,
    ) -> Result<serde_json::Value> {
        let params = params.ok_or_else(|| anyhow::anyhow!("Missing params"))?;
        let ssid = params
            .get("ssid")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow::anyhow!("Missing required parameter: ssid"))?;
        let password = params
            .get("password")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow::anyhow!("Missing required parameter: password"))?;

        // Validate SSID (prevent command injection)
        if ssid.len() > 64 || ssid.contains('\0') {
            anyhow::bail!("Invalid SSID");
        }
        // Validate WiFi password
        if password.len() > 63 || password.contains('\0') {
            anyhow::bail!("Invalid WiFi password (max 63 chars, no null bytes)");
        }

        tracing::info!("Connecting to WiFi network: {}", ssid);
        connect_wifi(ssid, password).await?;

        Ok(serde_json::json!({ "ok": true, "ssid": ssid }))
    }

    /// network.configure-ethernet — set DHCP or static IP for an ethernet interface.
    pub(super) async fn handle_network_configure_ethernet(
        &self,
        params: Option<serde_json::Value>,
    ) -> Result<serde_json::Value> {
        let params = params.ok_or_else(|| anyhow::anyhow!("Missing params"))?;
        let interface = params
            .get("interface")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow::anyhow!("Missing required parameter: interface"))?;
        let mode = params
            .get("mode")
            .and_then(|v| v.as_str())
            .unwrap_or("dhcp");

        // Validate interface name (alphanumeric + digits only)
        if !interface
            .bytes()
            .all(|b| b.is_ascii_alphanumeric() || b == b'-' || b == b'_')
        {
            anyhow::bail!("Invalid interface name");
        }

        match mode {
            "dhcp" => {
                tracing::info!("Setting {} to DHCP", interface);
                configure_ethernet_dhcp(interface).await?;
            }
            "static" => {
                let ip = params
                    .get("ip")
                    .and_then(|v| v.as_str())
                    .ok_or_else(|| anyhow::anyhow!("Missing required parameter: ip for static mode"))?;
                let gateway = params
                    .get("gateway")
                    .and_then(|v| v.as_str())
                    .unwrap_or("");
                let dns = params
                    .get("dns")
                    .and_then(|v| v.as_str())
                    .unwrap_or("1.1.1.1");

                // Validate IP: must parse as IP or CIDR
                let ip_part = ip.split('/').next().unwrap_or("");
                if ip_part.parse::<std::net::IpAddr>().is_err() {
                    anyhow::bail!("Invalid IP address format");
                }

                // Validate gateway if provided
                if !gateway.is_empty() && gateway.parse::<std::net::IpAddr>().is_err() {
                    anyhow::bail!("Invalid gateway IP address");
                }

                // Validate DNS server IP
                if dns.parse::<std::net::IpAddr>().is_err() {
                    anyhow::bail!("Invalid DNS server IP address");
                }

                tracing::info!("Setting {} to static IP {}", interface, ip);
                configure_ethernet_static(interface, ip, gateway, dns).await?;
            }
            _ => anyhow::bail!("Invalid mode: {}. Use 'dhcp' or 'static'", mode),
        }

        Ok(serde_json::json!({ "ok": true, "interface": interface, "mode": mode }))
    }

    /// network.dns-status — get current DNS configuration and status.
    pub(super) async fn handle_network_dns_status(&self) -> Result<serde_json::Value> {
        debug!("Getting DNS status");
        let status = dns::get_status(&self.config.data_dir).await?;
        Ok(serde_json::to_value(status)?)
    }

    /// network.configure-dns — configure DNS servers and provider.
    pub(super) async fn handle_network_configure_dns(
        &self,
        params: Option<serde_json::Value>,
    ) -> Result<serde_json::Value> {
        let params = params.ok_or_else(|| anyhow::anyhow!("Missing params"))?;
        let provider_str = params
            .get("provider")
            .and_then(|v| v.as_str())
            .ok_or_else(|| anyhow::anyhow!("Missing required parameter: provider"))?;

        let provider = match provider_str {
            "system" => dns::DnsProvider::System,
            "cloudflare" => dns::DnsProvider::Cloudflare,
            "google" => dns::DnsProvider::Google,
            "quad9" => dns::DnsProvider::Quad9,
            "mullvad" => dns::DnsProvider::Mullvad,
            "custom" => dns::DnsProvider::Custom,
            other => anyhow::bail!("Unknown DNS provider: {}. Use: system, cloudflare, google, quad9, mullvad, custom", other),
        };

        let custom_servers: Vec<String> = if provider == dns::DnsProvider::Custom {
            params
                .get("servers")
                .and_then(|v| v.as_array())
                .map(|arr| {
                    arr.iter()
                        .filter_map(|v| v.as_str().map(String::from))
                        .collect()
                })
                .unwrap_or_default()
        } else {
            Vec::new()
        };

        if provider == dns::DnsProvider::Custom && custom_servers.is_empty() {
            anyhow::bail!("Custom provider requires at least one DNS server in 'servers' array");
        }

        // Validate custom server IPs
        for s in &custom_servers {
            if s.parse::<std::net::IpAddr>().is_err() {
                anyhow::bail!("Invalid DNS server IP: {}", s);
            }
        }

        tracing::info!(provider = provider_str, "Configuring DNS");
        let config = dns::configure(&self.config.data_dir, provider, custom_servers).await?;

        Ok(serde_json::json!({
            "ok": true,
            "provider": config.provider.to_string(),
            "servers": config.servers,
            "doh_enabled": config.doh_enabled,
            "doh_url": config.doh_url,
        }))
    }
}

/// List network interfaces using `ip -j addr show`.
async fn list_interfaces() -> Result<Vec<serde_json::Value>> {
    let output = tokio::process::Command::new("ip")
        .args(["-j", "addr", "show"])
        .output()
        .await
        .context("Failed to run `ip addr show`")?;

    if !output.status.success() {
        anyhow::bail!(
            "ip addr show failed: {}",
            String::from_utf8_lossy(&output.stderr)
        );
    }

    let raw: Vec<serde_json::Value> =
        serde_json::from_slice(&output.stdout).context("Failed to parse ip JSON output")?;

    let interfaces: Vec<serde_json::Value> = raw
        .into_iter()
        .filter_map(|iface| {
            let name = iface.get("ifname")?.as_str()?;
            // Skip loopback
            if name == "lo" {
                return None;
            }
            let operstate = iface
                .get("operstate")
                .and_then(|v| v.as_str())
                .unwrap_or("UNKNOWN");
            let mac = iface
                .get("address")
                .and_then(|v| v.as_str())
                .unwrap_or("");

            // Get IPv4 addresses
            let addrs: Vec<String> = iface
                .get("addr_info")
                .and_then(|v| v.as_array())
                .map(|arr| {
                    arr.iter()
                        .filter(|a| a.get("family").and_then(|f| f.as_str()) == Some("inet"))
                        .filter_map(|a| {
                            let local = a.get("local")?.as_str()?;
                            let prefix = a.get("prefixlen")?.as_u64()?;
                            Some(format!("{}/{}", local, prefix))
                        })
                        .collect()
                })
                .unwrap_or_default();

            let iface_type = if name.starts_with("wl") {
                "wifi"
            } else if name.starts_with("en") || name.starts_with("eth") {
                "ethernet"
            } else if name.starts_with("veth") || name.starts_with("br-") || name.starts_with("docker") || name.starts_with("podman") {
                "virtual"
            } else {
                "other"
            };

            Some(serde_json::json!({
                "name": name,
                "type": iface_type,
                "state": operstate.to_lowercase(),
                "mac": mac,
                "ipv4": addrs,
            }))
        })
        .collect();

    Ok(interfaces)
}

/// Scan WiFi networks using `nmcli -t -f SSID,SIGNAL,SECURITY device wifi list`.
async fn scan_wifi() -> Result<Vec<serde_json::Value>> {
    // Trigger a rescan first
    let _ = tokio::process::Command::new("nmcli")
        .args(["device", "wifi", "rescan"])
        .output()
        .await;

    // Short delay for scan to complete
    tokio::time::sleep(std::time::Duration::from_secs(2)).await;

    let output = tokio::process::Command::new("nmcli")
        .args(["-t", "-f", "SSID,SIGNAL,SECURITY", "device", "wifi", "list"])
        .output()
        .await
        .context("Failed to run nmcli wifi list")?;

    if !output.status.success() {
        anyhow::bail!(
            "nmcli wifi list failed: {}",
            String::from_utf8_lossy(&output.stderr)
        );
    }

    let stdout = String::from_utf8(output.stdout).context("nmcli output not utf8")?;
    let mut seen = std::collections::HashSet::new();
    let networks: Vec<serde_json::Value> = stdout
        .lines()
        .filter_map(|line| {
            let parts: Vec<&str> = line.splitn(3, ':').collect();
            if parts.len() < 3 {
                return None;
            }
            let ssid = parts[0].trim();
            if ssid.is_empty() || !seen.insert(ssid.to_string()) {
                return None;
            }
            let signal: u32 = parts[1].parse().unwrap_or(0);
            let security = parts[2].trim();
            Some(serde_json::json!({
                "ssid": ssid,
                "signal": signal,
                "security": security,
            }))
        })
        .collect();

    Ok(networks)
}

/// Connect to a WiFi network using nmcli.
async fn connect_wifi(ssid: &str, password: &str) -> Result<()> {
    let output = tokio::process::Command::new("nmcli")
        .args(["device", "wifi", "connect", ssid, "password", password])
        .output()
        .await
        .context("Failed to run nmcli wifi connect")?;

    if !output.status.success() {
        let stderr = String::from_utf8_lossy(&output.stderr);
        anyhow::bail!("WiFi connection failed: {}", stderr);
    }

    Ok(())
}

/// Configure ethernet interface for DHCP using nmcli.
async fn configure_ethernet_dhcp(interface: &str) -> Result<()> {
    // Find or create a connection for this interface
    let conn_name = format!("archipelago-{}", interface);

    // Delete existing connection if any
    let _ = tokio::process::Command::new("nmcli")
        .args(["connection", "delete", &conn_name])
        .output()
        .await;

    // Create new DHCP connection
    let output = tokio::process::Command::new("nmcli")
        .args([
            "connection",
            "add",
            "type",
            "ethernet",
            "con-name",
            &conn_name,
            "ifname",
            interface,
            "ipv4.method",
            "auto",
        ])
        .output()
        .await
        .context("Failed to create DHCP connection")?;

    if !output.status.success() {
        anyhow::bail!(
            "nmcli connection add failed: {}",
            String::from_utf8_lossy(&output.stderr)
        );
    }

    // Activate the connection
    let activate = tokio::process::Command::new("nmcli")
        .args(["connection", "up", &conn_name])
        .output()
        .await
        .context("Failed to activate connection")?;

    if !activate.status.success() {
        anyhow::bail!(
            "nmcli connection up failed: {}",
            String::from_utf8_lossy(&activate.stderr)
        );
    }

    Ok(())
}

/// Configure ethernet interface with a static IP.
async fn configure_ethernet_static(
    interface: &str,
    ip: &str,
    gateway: &str,
    dns: &str,
) -> Result<()> {
    let conn_name = format!("archipelago-{}", interface);

    // Delete existing connection if any
    let _ = tokio::process::Command::new("nmcli")
        .args(["connection", "delete", &conn_name])
        .output()
        .await;

    let mut args = vec![
        "connection",
        "add",
        "type",
        "ethernet",
        "con-name",
        &conn_name,
        "ifname",
        interface,
        "ipv4.method",
        "manual",
        "ipv4.addresses",
        ip,
    ];

    if !gateway.is_empty() {
        args.push("ipv4.gateway");
        args.push(gateway);
    }

    args.push("ipv4.dns");
    args.push(dns);

    let output = tokio::process::Command::new("nmcli")
        .args(&args)
        .output()
        .await
        .context("Failed to create static connection")?;

    if !output.status.success() {
        anyhow::bail!(
            "nmcli connection add failed: {}",
            String::from_utf8_lossy(&output.stderr)
        );
    }

    let activate = tokio::process::Command::new("nmcli")
        .args(["connection", "up", &conn_name])
        .output()
        .await
        .context("Failed to activate connection")?;

    if !activate.status.success() {
        anyhow::bail!(
            "nmcli connection up failed: {}",
            String::from_utf8_lossy(&activate.stderr)
        );
    }

    Ok(())
}