smart-tree 8.0.1

// Service Manager for Smart Tree Daemon
// Cross-platform system-level service management:
//   Linux  → systemd (/etc/systemd/system/)
//   macOS  → launchd (/Library/LaunchDaemons/)
//   Windows → sc.exe (Windows Service)
//
// `st service install` auto-escalates privileges on all platforms.

use anyhow::{Context, Result};
use std::env;
use std::fs;
use std::path::PathBuf;
use std::process::{Command, Stdio};
use tracing::{error, info, warn};

// =============================================================================
// PLATFORM DETECTION
// =============================================================================

#[derive(Debug, Clone, Copy, PartialEq)]
pub enum Platform {
    Linux,
    MacOS,
    Windows,
    Unknown,
}

impl Platform {
    pub fn current() -> Self {
        #[cfg(target_os = "linux")]
        return Platform::Linux;

        #[cfg(target_os = "macos")]
        return Platform::MacOS;

        #[cfg(target_os = "windows")]
        return Platform::Windows;

        #[cfg(not(any(target_os = "linux", target_os = "macos", target_os = "windows")))]
        return Platform::Unknown;
    }

    pub fn service_manager_name(&self) -> &'static str {
        match self {
            Platform::Linux => "systemd",
            Platform::MacOS => "launchctl",
            Platform::Windows => "sc.exe",
            Platform::Unknown => "unknown",
        }
    }
}

// =============================================================================
// CONSTANTS
// =============================================================================

const DAEMON_PORT: u16 = 28428;

// Linux
const SYSTEMD_DAEMON_SERVICE: &str = "smart-tree-daemon.service";
const SYSTEMD_SYSTEM_PATH: &str = "/etc/systemd/system";

// macOS
const LAUNCHD_DAEMON_LABEL: &str = "is.8b.smart-tree-daemon";
const LAUNCHD_DAEMON_PLIST: &str = "/Library/LaunchDaemons/is.8b.smart-tree-daemon.plist";

// Windows
#[cfg(target_os = "windows")]
const WINDOWS_SERVICE_NAME: &str = "SmartTreeDaemon";

// =============================================================================
// PRIVILEGE ESCALATION
// =============================================================================

/// Check if running as root/admin
fn is_elevated() -> bool {
    #[cfg(unix)]
    {
        unsafe { libc::geteuid() == 0 }
    }
    #[cfg(windows)]
    {
        // Check for admin by trying to open a privileged registry key
        use std::process::Command;
        Command::new("net")
            .args(["session"])
            .stdout(Stdio::null())
            .stderr(Stdio::null())
            .status()
            .map(|s| s.success())
            .unwrap_or(false)
    }
}

/// Re-execute the current command with elevated privileges.
/// Returns Ok(true) if we re-launched (caller should exit), Ok(false) if already elevated.
fn escalate_privileges(args: &[&str]) -> Result<bool> {
    if is_elevated() {
        return Ok(false);
    }

    let exe = env::current_exe().context("Could not determine executable path")?;

    println!("This operation requires elevated privileges.");
    println!();

    #[cfg(target_os = "linux")]
    {
        // Try pkexec first (graphical prompt), fall back to sudo
        let cmd = if which_binary("pkexec").is_some() {
            println!("Requesting permission via pkexec...");
            let mut c = Command::new("pkexec");
            c.arg(&exe);
            c.args(args);
            c
        } else {
            println!("Requesting permission via sudo...");
            let mut c = Command::new("sudo");
            c.arg(&exe);
            c.args(args);
            c
        };
        let status = run_elevated(cmd)?;
        if !status.success() {
            anyhow::bail!("Elevated command failed (exit code: {:?})", status.code());
        }
        return Ok(true);
    }

    #[cfg(target_os = "macos")]
    {
        // osascript for graphical prompt, or sudo for terminal
        if env::var("TERM_PROGRAM").is_ok() || env::var("SSH_CONNECTION").is_ok() {
            println!("Requesting permission via sudo...");
            let mut cmd = Command::new("sudo");
            cmd.arg(&exe);
            cmd.args(args);
            let status = run_elevated(cmd)?;
            if !status.success() {
                anyhow::bail!("Elevated command failed");
            }
        } else {
            // Use osascript for GUI prompt
            let args_str = std::iter::once(exe.to_string_lossy().to_string())
                .chain(args.iter().map(|a| a.to_string()))
                .collect::<Vec<_>>()
                .join("' '");
            let script = format!(
                "do shell script \"'{}' \" with administrator privileges",
                args_str
            );
            let mut cmd = Command::new("osascript");
            cmd.args(["-e", &script]);
            let status = run_elevated(cmd)?;
            if !status.success() {
                anyhow::bail!("Elevated command failed");
            }
        }
        return Ok(true);
    }

    #[cfg(target_os = "windows")]
    {
        // Use PowerShell Start-Process -Verb RunAs for UAC prompt
        let args_joined = args.join(" ");
        let ps_cmd = format!(
            "Start-Process -FilePath '{}' -ArgumentList '{}' -Verb RunAs -Wait",
            exe.display(),
            args_joined
        );
        println!("Requesting administrator permission...");
        let mut cmd = Command::new("powershell");
        cmd.args(["-Command", &ps_cmd]);
        let status = run_elevated(cmd)?;
        if !status.success() {
            anyhow::bail!("Elevated command failed");
        }
        return Ok(true);
    }

    #[cfg(not(any(target_os = "linux", target_os = "macos", target_os = "windows")))]
    anyhow::bail!("Privilege escalation not supported on this platform")
}

fn run_elevated(mut cmd: Command) -> Result<std::process::ExitStatus> {
    cmd.stdout(Stdio::inherit())
        .stderr(Stdio::inherit())
        .stdin(Stdio::inherit())
        .status()
        .context("Failed to run elevated command")
}

// =============================================================================
// CROSS-PLATFORM PUBLIC API
// =============================================================================

/// Install the Smart Tree daemon as a system-level service.
/// Auto-escalates privileges if needed.
pub fn install() -> Result<()> {
    let platform = Platform::current();
    println!(
        "Installing Smart Tree daemon as system service ({})...",
        platform.service_manager_name()
    );
    println!();

    match platform {
        Platform::Linux => linux_install(),
        Platform::MacOS => macos_install(),
        Platform::Windows => windows_install(),
        Platform::Unknown => anyhow::bail!("Unsupported platform for service management"),
    }
}

/// Uninstall the system-level service.
pub fn uninstall() -> Result<()> {
    match Platform::current() {
        Platform::Linux => linux_uninstall(),
        Platform::MacOS => macos_uninstall(),
        Platform::Windows => windows_uninstall(),
        Platform::Unknown => anyhow::bail!("Unsupported platform"),
    }
}

/// Start the service.
pub fn start() -> Result<()> {
    match Platform::current() {
        Platform::Linux => linux_start(),
        Platform::MacOS => macos_start(),
        Platform::Windows => windows_start(),
        Platform::Unknown => anyhow::bail!("Unsupported platform"),
    }
}

/// Stop the service.
pub fn stop() -> Result<()> {
    match Platform::current() {
        Platform::Linux => linux_stop(),
        Platform::MacOS => macos_stop(),
        Platform::Windows => windows_stop(),
        Platform::Unknown => anyhow::bail!("Unsupported platform"),
    }
}

/// Show service status.
pub fn status() -> Result<()> {
    match Platform::current() {
        Platform::Linux => linux_status(),
        Platform::MacOS => macos_status(),
        Platform::Windows => windows_status(),
        Platform::Unknown => anyhow::bail!("Unsupported platform"),
    }
}

/// Show service logs.
pub fn logs() -> Result<()> {
    match Platform::current() {
        Platform::Linux => linux_logs(),
        Platform::MacOS => macos_logs(),
        Platform::Windows => windows_logs(),
        Platform::Unknown => anyhow::bail!("Unsupported platform"),
    }
}

/// Deprecated: use install() instead. Kept for --daemon-install backward compat.
pub fn daemon_install_system() -> Result<()> {
    eprintln!("Note: --daemon-install is deprecated, use `st service install` instead.");
    install()
}

// =============================================================================
// LINUX (systemd) — /etc/systemd/system/
// =============================================================================

fn linux_install() -> Result<()> {
    // Escalate if not root
    if escalate_privileges(&["service", "install"])? {
        return Ok(()); // child process did the work
    }

    // We're root now
    info!("Installing systemd system service...");

    // 1. Find/copy binary to /usr/local/bin
    let install_path = install_binary()?;

    // 2. Create state directory
    fs::create_dir_all("/var/lib/smart-tree")
        .context("Failed to create /var/lib/smart-tree")?;

    // 3. Store integrity hash
    let hash = compute_file_hash(&install_path)?;
    fs::write("/var/lib/smart-tree/daemon.sha256", &hash)?;

    // 4. Write the systemd service file
    let service_dest = PathBuf::from(SYSTEMD_SYSTEM_PATH).join(SYSTEMD_DAEMON_SERVICE);
    let service_content = generate_systemd_unit(&install_path);
    fs::write(&service_dest, &service_content)
        .with_context(|| format!("Failed to write {}", service_dest.display()))?;

    // 5. Reload and enable
    run_command("systemctl", &["daemon-reload"])?;
    run_command("systemctl", &["enable", "--now", SYSTEMD_DAEMON_SERVICE])?;

    print_install_success("systemctl status smart-tree-daemon", "journalctl -u smart-tree-daemon -f");
    Ok(())
}

fn linux_uninstall() -> Result<()> {
    if escalate_privileges(&["service", "uninstall"])? {
        return Ok(());
    }

    let _ = run_command("systemctl", &["stop", SYSTEMD_DAEMON_SERVICE]);
    let _ = run_command("systemctl", &["disable", SYSTEMD_DAEMON_SERVICE]);

    let service_path = PathBuf::from(SYSTEMD_SYSTEM_PATH).join(SYSTEMD_DAEMON_SERVICE);
    if service_path.exists() {
        fs::remove_file(&service_path)?;
    }
    run_command("systemctl", &["daemon-reload"])?;

    println!("Service uninstalled.");
    Ok(())
}

fn linux_start() -> Result<()> {
    if escalate_privileges(&["service", "start"])? {
        return Ok(());
    }
    run_command("systemctl", &["start", SYSTEMD_DAEMON_SERVICE])?;
    println!("Service started. Dashboard: http://localhost:{}", DAEMON_PORT);
    Ok(())
}

fn linux_stop() -> Result<()> {
    if escalate_privileges(&["service", "stop"])? {
        return Ok(());
    }
    run_command("systemctl", &["stop", SYSTEMD_DAEMON_SERVICE])?;
    println!("Service stopped.");
    Ok(())
}

fn linux_status() -> Result<()> {
    // status doesn't need root — systemctl status works for any user
    println!("Smart Tree Daemon Status (Linux/systemd)");
    println!("─────────────────────────────────────────");
    let _ = run_command("systemctl", &["status", SYSTEMD_DAEMON_SERVICE, "--no-pager"]);
    Ok(())
}

fn linux_logs() -> Result<()> {
    let _ = run_command("journalctl", &["-u", SYSTEMD_DAEMON_SERVICE, "-n", "50", "--no-pager", "-f"]);
    Ok(())
}

fn generate_systemd_unit(binary_path: &PathBuf) -> String {
    format!(
        r#"[Unit]
Description=Smart Tree Daemon - AI Context Service
Documentation=https://github.com/8b-is/smart-tree
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
ExecStart={binary} --http-daemon

StateDirectory=smart-tree
StateDirectoryMode=0755
RuntimeDirectory=smart-tree
RuntimeDirectoryMode=0755

Environment=RUST_LOG=info
Environment=ST_TOKEN_PATH=/var/lib/smart-tree/daemon.token

Restart=always
RestartSec=10
TimeoutStopSec=30

StandardOutput=journal
StandardError=journal
SyslogIdentifier=smart-tree-daemon

WorkingDirectory=/var/lib/smart-tree

NoNewPrivileges=yes
ProtectSystem=strict
ProtectHome=read-only
PrivateTmp=yes
ProtectKernelTunables=yes
ProtectKernelModules=yes
ProtectControlGroups=yes
ReadOnlyPaths=/home

[Install]
WantedBy=multi-user.target
"#,
        binary = binary_path.display(),
    )
}

// =============================================================================
// macOS (launchd) — /Library/LaunchDaemons/
// =============================================================================

fn macos_install() -> Result<()> {
    if escalate_privileges(&["service", "install"])? {
        return Ok(());
    }

    info!("Installing LaunchDaemon...");

    // 1. Install binary
    let install_path = install_binary()?;

    // 2. Create state directory
    let state_dir = PathBuf::from("/var/lib/smart-tree");
    fs::create_dir_all(&state_dir).context("Failed to create /var/lib/smart-tree")?;

    // 3. Store integrity hash
    let hash = compute_file_hash(&install_path)?;
    fs::write(state_dir.join("daemon.sha256"), &hash)?;

    // 4. Create log directory
    let log_dir = PathBuf::from("/var/log/smart-tree");
    fs::create_dir_all(&log_dir).context("Failed to create /var/log/smart-tree")?;

    // 5. Write the LaunchDaemon plist
    let plist = generate_launchd_daemon_plist(&install_path);
    fs::write(LAUNCHD_DAEMON_PLIST, &plist)
        .with_context(|| format!("Failed to write {}", LAUNCHD_DAEMON_PLIST))?;

    // 6. Set ownership (must be owned by root:wheel for launchd)
    run_command("chown", &["root:wheel", LAUNCHD_DAEMON_PLIST])?;
    run_command("chmod", &["644", LAUNCHD_DAEMON_PLIST])?;

    // 7. Load the daemon
    // On macOS 10.10+, use launchctl bootstrap. Older: launchctl load.
    let load_result = Command::new("launchctl")
        .args(["bootstrap", "system", LAUNCHD_DAEMON_PLIST])
        .stdout(Stdio::inherit())
        .stderr(Stdio::inherit())
        .status();

    match load_result {
        Ok(s) if s.success() => {}
        _ => {
            // Fallback to legacy load
            info!("bootstrap failed, trying legacy load...");
            run_command("launchctl", &["load", "-w", LAUNCHD_DAEMON_PLIST])?;
        }
    }

    print_install_success(
        "sudo launchctl list | grep smart-tree",
        "tail -f /var/log/smart-tree/daemon.log",
    );
    Ok(())
}

fn macos_uninstall() -> Result<()> {
    if escalate_privileges(&["service", "uninstall"])? {
        return Ok(());
    }

    // Try modern bootout, fall back to legacy unload
    let _ = Command::new("launchctl")
        .args(["bootout", "system", LAUNCHD_DAEMON_PLIST])
        .stdout(Stdio::null())
        .stderr(Stdio::null())
        .status();
    let _ = Command::new("launchctl")
        .args(["unload", LAUNCHD_DAEMON_PLIST])
        .stdout(Stdio::null())
        .stderr(Stdio::null())
        .status();

    if PathBuf::from(LAUNCHD_DAEMON_PLIST).exists() {
        fs::remove_file(LAUNCHD_DAEMON_PLIST)?;
    }

    println!("Service uninstalled.");
    Ok(())
}

fn macos_start() -> Result<()> {
    if escalate_privileges(&["service", "start"])? {
        return Ok(());
    }
    // kickstart forces immediate start
    let result = Command::new("launchctl")
        .args(["kickstart", &format!("system/{}", LAUNCHD_DAEMON_LABEL)])
        .stdout(Stdio::inherit())
        .stderr(Stdio::inherit())
        .status();

    match result {
        Ok(s) if s.success() => {}
        _ => {
            // Fallback: bootstrap loads + starts
            run_command("launchctl", &["load", "-w", LAUNCHD_DAEMON_PLIST])?;
        }
    }

    println!("Service started. Dashboard: http://localhost:{}", DAEMON_PORT);
    Ok(())
}

fn macos_stop() -> Result<()> {
    if escalate_privileges(&["service", "stop"])? {
        return Ok(());
    }
    let _ = Command::new("launchctl")
        .args(["kill", "SIGTERM", &format!("system/{}", LAUNCHD_DAEMON_LABEL)])
        .stdout(Stdio::inherit())
        .stderr(Stdio::inherit())
        .status();

    println!("Service stopped.");
    Ok(())
}

fn macos_status() -> Result<()> {
    println!("Smart Tree Daemon Status (macOS/launchd)");
    println!("─────────────────────────────────────────");

    if !PathBuf::from(LAUNCHD_DAEMON_PLIST).exists() {
        println!("Status:  NOT INSTALLED");
        println!("Install: st service install");
        return Ok(());
    }

    let output = Command::new("launchctl")
        .args(["print", &format!("system/{}", LAUNCHD_DAEMON_LABEL)])
        .output();

    match output {
        Ok(out) if out.status.success() => {
            let text = String::from_utf8_lossy(&out.stdout);
            if text.contains("state = running") {
                println!("Status:  RUNNING");
            } else {
                println!("Status:  LOADED (not running)");
            }
            // Show PID if available
            for line in text.lines() {
                let trimmed = line.trim();
                if trimmed.starts_with("pid =") || trimmed.starts_with("state =") {
                    println!("  {}", trimmed);
                }
            }
        }
        _ => {
            // Fallback: check launchctl list
            let list = Command::new("launchctl")
                .args(["list"])
                .output();
            if let Ok(out) = list {
                let text = String::from_utf8_lossy(&out.stdout);
                if text.contains(LAUNCHD_DAEMON_LABEL) {
                    println!("Status:  LOADED");
                } else {
                    println!("Status:  NOT LOADED");
                }
            }
        }
    }

    Ok(())
}

fn macos_logs() -> Result<()> {
    let log_path = "/var/log/smart-tree/daemon.log";
    if PathBuf::from(log_path).exists() {
        println!("Showing logs from {}", log_path);
        println!("─────────────────────────────────");
        run_command("tail", &["-f", log_path])?;
    } else {
        // Try system log
        println!("Showing logs from system log...");
        run_command("log", &["show", "--predicate", "process == \"st\"", "--last", "1h", "--style", "compact"])?;
    }
    Ok(())
}

fn generate_launchd_daemon_plist(binary_path: &PathBuf) -> String {
    format!(
        r#"<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>{label}</string>

    <key>ProgramArguments</key>
    <array>
        <string>{binary}</string>
        <string>--http-daemon</string>
    </array>

    <key>RunAtLoad</key>
    <true/>

    <key>KeepAlive</key>
    <true/>

    <key>WorkingDirectory</key>
    <string>/var/lib/smart-tree</string>

    <key>StandardOutPath</key>
    <string>/var/log/smart-tree/daemon.log</string>

    <key>StandardErrorPath</key>
    <string>/var/log/smart-tree/daemon.log</string>

    <key>EnvironmentVariables</key>
    <dict>
        <key>RUST_LOG</key>
        <string>info</string>
        <key>ST_TOKEN_PATH</key>
        <string>/var/lib/smart-tree/daemon.token</string>
    </dict>

    <key>ThrottleInterval</key>
    <integer>10</integer>
</dict>
</plist>
"#,
        label = LAUNCHD_DAEMON_LABEL,
        binary = binary_path.display(),
    )
}

// =============================================================================
// WINDOWS (sc.exe Windows Service)
// =============================================================================

fn windows_install() -> Result<()> {
    #[cfg(not(target_os = "windows"))]
    {
        anyhow::bail!("Windows service management is only available on Windows");
    }

    #[cfg(target_os = "windows")]
    {
        if escalate_privileges(&["service", "install"])? {
            return Ok(());
        }

        info!("Installing Windows service...");

        // 1. Find/copy binary
        let install_path = install_binary()?;

        // 2. Create state directory
        let state_dir = dirs::data_dir()
            .unwrap_or_else(|| PathBuf::from("C:\\ProgramData"))
            .join("SmartTree");
        fs::create_dir_all(&state_dir)?;

        // 3. Store integrity hash
        let hash = compute_file_hash(&install_path)?;
        fs::write(state_dir.join("daemon.sha256"), &hash)?;

        // 4. Create the Windows service using sc.exe
        let bin_arg = format!(
            "\"{}\" --http-daemon --daemon-port {}",
            install_path.display(),
            DAEMON_PORT
        );

        // Delete existing service first (ignore error if it doesn't exist)
        let _ = Command::new("sc.exe")
            .args(["delete", WINDOWS_SERVICE_NAME])
            .stdout(Stdio::null())
            .stderr(Stdio::null())
            .status();

        run_command(
            "sc.exe",
            &[
                "create",
                WINDOWS_SERVICE_NAME,
                &format!("binPath= {}", bin_arg),
                "start= auto",
                "DisplayName= Smart Tree Daemon",
            ],
        )?;

        // Set description
        run_command(
            "sc.exe",
            &[
                "description",
                WINDOWS_SERVICE_NAME,
                "Smart Tree - AI-friendly directory visualization daemon",
            ],
        )?;

        // Set recovery: restart on failure
        run_command(
            "sc.exe",
            &[
                "failure",
                WINDOWS_SERVICE_NAME,
                "reset= 86400",
                "actions= restart/10000/restart/30000/restart/60000",
            ],
        )?;

        // Start the service
        run_command("sc.exe", &["start", WINDOWS_SERVICE_NAME])?;

        print_install_success(
            "sc.exe query SmartTreeDaemon",
            "Get-EventLog -LogName Application -Source SmartTreeDaemon",
        );
        Ok(())
    }
}

fn windows_uninstall() -> Result<()> {
    #[cfg(not(target_os = "windows"))]
    {
        anyhow::bail!("Windows service management is only available on Windows");
    }

    #[cfg(target_os = "windows")]
    {
        if escalate_privileges(&["service", "uninstall"])? {
            return Ok(());
        }

        let _ = Command::new("sc.exe")
            .args(["stop", WINDOWS_SERVICE_NAME])
            .stdout(Stdio::null())
            .stderr(Stdio::null())
            .status();

        run_command("sc.exe", &["delete", WINDOWS_SERVICE_NAME])?;
        println!("Service uninstalled.");
        Ok(())
    }
}

fn windows_start() -> Result<()> {
    #[cfg(not(target_os = "windows"))]
    {
        anyhow::bail!("Windows service management is only available on Windows");
    }

    #[cfg(target_os = "windows")]
    {
        if escalate_privileges(&["service", "start"])? {
            return Ok(());
        }
        run_command("sc.exe", &["start", WINDOWS_SERVICE_NAME])?;
        println!("Service started. Dashboard: http://localhost:{}", DAEMON_PORT);
        Ok(())
    }
}

fn windows_stop() -> Result<()> {
    #[cfg(not(target_os = "windows"))]
    {
        anyhow::bail!("Windows service management is only available on Windows");
    }

    #[cfg(target_os = "windows")]
    {
        if escalate_privileges(&["service", "stop"])? {
            return Ok(());
        }
        run_command("sc.exe", &["stop", WINDOWS_SERVICE_NAME])?;
        println!("Service stopped.");
        Ok(())
    }
}

fn windows_status() -> Result<()> {
    #[cfg(not(target_os = "windows"))]
    {
        anyhow::bail!("Windows service management is only available on Windows");
    }

    #[cfg(target_os = "windows")]
    {
        println!("Smart Tree Daemon Status (Windows)");
        println!("──────────────────────────────────");
        let _ = run_command("sc.exe", &["query", WINDOWS_SERVICE_NAME]);
        Ok(())
    }
}

fn windows_logs() -> Result<()> {
    #[cfg(not(target_os = "windows"))]
    {
        anyhow::bail!("Windows service management is only available on Windows");
    }

    #[cfg(target_os = "windows")]
    {
        let log_path = dirs::data_dir()
            .unwrap_or_else(|| PathBuf::from("C:\\ProgramData"))
            .join("SmartTree")
            .join("daemon.log");

        if log_path.exists() {
            println!("Showing logs from {}", log_path.display());
            run_command("powershell", &["-Command", &format!("Get-Content -Path '{}' -Tail 50 -Wait", log_path.display())])?;
        } else {
            println!("Log file not found at {}", log_path.display());
            println!("Try: Get-EventLog -LogName Application -Source SmartTreeDaemon -Newest 50");
        }
        Ok(())
    }
}

// =============================================================================
// SHARED UTILITIES
// =============================================================================

/// Copy the current binary to the system install path.
/// Returns the path where the binary was installed.
fn install_binary() -> Result<PathBuf> {
    let current_exe = env::current_exe().context("Failed to get current executable path")?;

    #[cfg(unix)]
    let install_path = PathBuf::from("/usr/local/bin/st");

    #[cfg(windows)]
    let install_path = {
        let prog = env::var("ProgramFiles").unwrap_or_else(|_| "C:\\Program Files".to_string());
        let dir = PathBuf::from(prog).join("SmartTree");
        fs::create_dir_all(&dir)?;
        dir.join("st.exe")
    };

    if current_exe != install_path {
        println!("  Copying binary to {}...", install_path.display());
        fs::copy(&current_exe, &install_path)
            .with_context(|| format!("Failed to copy binary to {}", install_path.display()))?;

        #[cfg(unix)]
        {
            use std::os::unix::fs::PermissionsExt;
            fs::set_permissions(&install_path, fs::Permissions::from_mode(0o755))?;
        }
    } else {
        println!("  Binary already at {}.", install_path.display());
    }

    Ok(install_path)
}

/// Compute SHA256 hash of a file for integrity verification.
fn compute_file_hash(path: &std::path::Path) -> Result<String> {
    use sha2::{Digest, Sha256};
    use std::io::Read;

    let mut file =
        fs::File::open(path).with_context(|| format!("Failed to open {}", path.display()))?;

    let mut hasher = Sha256::new();
    let mut buffer = [0u8; 8192];
    loop {
        let n = file.read(&mut buffer)?;
        if n == 0 {
            break;
        }
        hasher.update(&buffer[..n]);
    }
    Ok(format!("{:x}", hasher.finalize()))
}

/// Run a command, inheriting stdio.
fn run_command(command: &str, args: &[&str]) -> Result<()> {
    info!("Running: {} {}", command, args.join(" "));
    let status = Command::new(command)
        .args(args)
        .stdout(Stdio::inherit())
        .stderr(Stdio::inherit())
        .status()
        .with_context(|| format!("Failed to execute: {}", command))?;

    if !status.success() {
        error!("Command failed: {} (exit: {})", command, status);
        anyhow::bail!("Command failed: {} {}", command, args.join(" "));
    }
    Ok(())
}

/// Find a binary on PATH.
fn which_binary(name: &str) -> Option<PathBuf> {
    which::which(name).ok()
}

/// Print the post-install success banner.
fn print_install_success(status_cmd: &str, logs_cmd: &str) {
    println!();
    println!("Smart Tree daemon installed and running!");
    println!();
    println!("  Dashboard:  http://localhost:{}", DAEMON_PORT);
    println!("  Token:      /var/lib/smart-tree/daemon.token");
    println!();
    println!("  Status:     {}", status_cmd);
    println!("  Logs:       {}", logs_cmd);
    println!("  Stop:       st service stop");
    println!("  Uninstall:  st service uninstall");
}

// =============================================================================
// GPG SIGNATURE VERIFICATION
// =============================================================================

/// 8bit-wraith's official GPG key fingerprint for signed releases
pub const OFFICIAL_GPG_FINGERPRINT: &str = "wraith@8b.is";

/// Check if this is an officially signed build
pub fn verify_gpg_signature() -> SignatureStatus {
    let sig_path = PathBuf::from("/usr/local/bin/st.sig");
    let binary_path = PathBuf::from("/usr/local/bin/st");

    if !sig_path.exists() {
        return SignatureStatus::Unsigned;
    }

    let output = Command::new("gpg")
        .args([
            "--verify",
            sig_path.to_string_lossy().as_ref(),
            binary_path.to_string_lossy().as_ref(),
        ])
        .output();

    match output {
        Ok(result) => {
            let stderr = String::from_utf8_lossy(&result.stderr);
            if result.status.success() {
                if stderr.contains(OFFICIAL_GPG_FINGERPRINT) {
                    SignatureStatus::OfficialBuild
                } else {
                    SignatureStatus::CommunityBuild(extract_signer(&stderr))
                }
            } else if stderr.contains("BAD signature") {
                SignatureStatus::TamperedOrInvalid
            } else {
                SignatureStatus::Unsigned
            }
        }
        Err(_) => SignatureStatus::GpgNotAvailable,
    }
}

fn extract_signer(gpg_output: &str) -> String {
    for line in gpg_output.lines() {
        if line.contains("Good signature from") {
            return line.to_string();
        }
    }
    "Unknown signer".to_string()
}

#[derive(Debug, Clone, PartialEq)]
pub enum SignatureStatus {
    OfficialBuild,
    CommunityBuild(String),
    Unsigned,
    TamperedOrInvalid,
    GpgNotAvailable,
}

/// Print signature verification banner on first run
pub fn print_signature_banner() {
    let first_run_marker = dirs::data_dir()
        .map(|d| d.join("smart-tree").join(".first_run_complete"))
        .unwrap_or_else(|| PathBuf::from("/tmp/.st_first_run"));

    if first_run_marker.exists() {
        return;
    }

    let status = verify_gpg_signature();

    println!();
    match status {
        SignatureStatus::OfficialBuild => {
            println!("  OFFICIAL BUILD - Signed by 8bit-wraith (wraith@8b.is)");
            println!("  This binary is cryptographically verified as an authentic release.");
        }
        SignatureStatus::CommunityBuild(ref signer) => {
            println!("  COMMUNITY BUILD - Signed but NOT by the official 8b.is key.");
            println!(
                "  Signer: {}",
                &signer[..signer.len().min(70)]
            );
            println!("  Verify you trust this signer before proceeding.");
        }
        SignatureStatus::Unsigned => {
            println!("  UNSIGNED BUILD - No GPG signature found.");
            println!("  This is normal for dev builds or self-compiled versions.");
            println!("  Official releases: https://i1.is/smart-tree");
        }
        SignatureStatus::TamperedOrInvalid => {
            println!("  WARNING: SIGNATURE VERIFICATION FAILED");
            println!("  The binary signature does NOT match the file contents!");
            println!("  Re-download from https://i1.is/smart-tree");
        }
        SignatureStatus::GpgNotAvailable => {
            println!("  GPG not available - signature verification skipped.");
            println!("  Install gnupg to enable verification of official builds.");
        }
    }
    println!();

    if let Some(parent) = first_run_marker.parent() {
        let _ = fs::create_dir_all(parent);
    }
    let _ = fs::write(&first_run_marker, "shown");
}

// =============================================================================
// GUARDIAN — kept for backward compatibility
// =============================================================================

/// Verify the installed binary hasn't been tampered with
pub fn guardian_verify_integrity() -> Result<bool> {
    let installed_path = PathBuf::from("/usr/local/bin/st");

    if !installed_path.exists() {
        warn!("Binary not found at /usr/local/bin/st");
        return Ok(false);
    }

    let installed_hash = compute_file_hash(&installed_path)?;
    let hash_file = PathBuf::from("/var/lib/smart-tree/guardian.sha256");

    if hash_file.exists() {
        let stored_hash = fs::read_to_string(&hash_file)?.trim().to_string();
        if installed_hash != stored_hash {
            error!("INTEGRITY VIOLATION: Binary has been modified!");
            error!("  Expected: {}", stored_hash);
            error!("  Found:    {}", installed_hash);
            return Ok(false);
        }
        info!("Binary integrity verified");
        Ok(true)
    } else {
        warn!("No stored hash found - cannot verify integrity");
        Ok(true)
    }
}

/// Install Smart Tree Guardian as a root daemon
pub fn guardian_install() -> Result<()> {
    println!("Smart Tree Guardian - System-wide AI Protection Daemon");
    println!();

    if escalate_privileges(&["--guardian-install"])? {
        return Ok(());
    }

    info!("Installing Guardian daemon...");

    // 1. Install binary
    let target_bin = install_binary()?;

    // 2. Create state directory & store hash
    fs::create_dir_all("/var/lib/smart-tree")?;
    let hash = compute_file_hash(&target_bin)?;
    fs::write("/var/lib/smart-tree/guardian.sha256", &hash)?;

    // 3. Write service file (platform-specific)
    match Platform::current() {
        Platform::Linux => {
            let service_content = include_str!("../systemd/smart-tree-guardian.service");
            let service_path = format!("{}/{}", SYSTEMD_SYSTEM_PATH, "smart-tree-guardian.service");
            fs::write(&service_path, service_content)?;
            run_command("systemctl", &["daemon-reload"])?;
            run_command("systemctl", &["enable", "smart-tree-guardian.service"])?;
            run_command("systemctl", &["start", "smart-tree-guardian.service"])?;
        }
        Platform::MacOS => {
            let plist = format!(
                r#"<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>is.8b.smart-tree-guardian</string>
    <key>ProgramArguments</key>
    <array>
        <string>{}</string>
        <string>--guardian-daemon</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
    <key>KeepAlive</key>
    <true/>
    <key>WorkingDirectory</key>
    <string>/var/lib/smart-tree</string>
    <key>StandardOutPath</key>
    <string>/var/log/smart-tree/guardian.log</string>
    <key>StandardErrorPath</key>
    <string>/var/log/smart-tree/guardian.log</string>
</dict>
</plist>
"#,
                target_bin.display()
            );
            let plist_path = "/Library/LaunchDaemons/is.8b.smart-tree-guardian.plist";
            fs::create_dir_all("/var/log/smart-tree")?;
            fs::write(plist_path, &plist)?;
            run_command("chown", &["root:wheel", plist_path])?;
            run_command("chmod", &["644", plist_path])?;
            let _ = Command::new("launchctl")
                .args(["bootstrap", "system", plist_path])
                .status();
        }
        _ => {
            anyhow::bail!("Guardian is currently supported on Linux and macOS only");
        }
    }

    println!();
    println!("Guardian installed and running!");
    println!("  Status: st --guardian-status");
    Ok(())
}

/// Uninstall Smart Tree Guardian
pub fn guardian_uninstall() -> Result<()> {
    if escalate_privileges(&["--guardian-uninstall"])? {
        return Ok(());
    }

    match Platform::current() {
        Platform::Linux => {
            let _ = run_command("systemctl", &["stop", "smart-tree-guardian.service"]);
            let _ = run_command("systemctl", &["disable", "smart-tree-guardian.service"]);
            let path = format!("{}/smart-tree-guardian.service", SYSTEMD_SYSTEM_PATH);
            if PathBuf::from(&path).exists() {
                fs::remove_file(&path)?;
            }
            run_command("systemctl", &["daemon-reload"])?;
        }
        Platform::MacOS => {
            let plist = "/Library/LaunchDaemons/is.8b.smart-tree-guardian.plist";
            let _ = Command::new("launchctl")
                .args(["bootout", "system", plist])
                .status();
            if PathBuf::from(plist).exists() {
                fs::remove_file(plist)?;
            }
        }
        _ => {}
    }

    println!("Guardian uninstalled.");
    Ok(())
}

/// Show Guardian daemon status
pub fn guardian_status() -> Result<()> {
    println!("Smart Tree Guardian Status");
    println!("─────────────────────────");

    match Platform::current() {
        Platform::Linux => {
            let service_path = format!("{}/smart-tree-guardian.service", SYSTEMD_SYSTEM_PATH);
            if !PathBuf::from(&service_path).exists() {
                println!("Status: NOT INSTALLED");
                println!("Install: st --guardian-install");
                return Ok(());
            }
            let _ = run_command("systemctl", &["status", "smart-tree-guardian.service", "--no-pager"]);
        }
        Platform::MacOS => {
            let plist = "/Library/LaunchDaemons/is.8b.smart-tree-guardian.plist";
            if !PathBuf::from(plist).exists() {
                println!("Status: NOT INSTALLED");
                println!("Install: st --guardian-install");
                return Ok(());
            }
            let output = Command::new("launchctl")
                .args(["print", "system/is.8b.smart-tree-guardian"])
                .output();
            match output {
                Ok(out) if out.status.success() => {
                    println!("Status: RUNNING");
                    let text = String::from_utf8_lossy(&out.stdout);
                    for line in text.lines() {
                        let trimmed = line.trim();
                        if trimmed.starts_with("pid =") || trimmed.starts_with("state =") {
                            println!("  {}", trimmed);
                        }
                    }
                }
                _ => println!("Status: LOADED (check sudo launchctl list | grep guardian)"),
            }
        }
        _ => {
            println!("Guardian status not available on this platform.");
        }
    }

    Ok(())
}