inferno-ai 0.10.3

#![allow(dead_code, unused_imports, unused_variables, clippy::ptr_arg)]
//! # Safety Checker
//!
//! Pre-installation safety checks to ensure system compatibility,
//! sufficient resources, and safe upgrade conditions.

use super::{UpdateInfo, UpgradeConfig, UpgradeError, UpgradeResult};
use base64::Engine;
use ring::signature::{self, UnparsedPublicKey};
use std::io::Read;
use std::path::PathBuf;
use std::process::Command;
use sysinfo::{DiskExt, ProcessExt, System, SystemExt};
use tracing::{debug, info, warn};

/// Inferno's Ed25519 public key for signature verification
/// This key is used to verify update packages are from the official Inferno project
const INFERNO_PUBLIC_KEY: &[u8] = &[
    // Placeholder public key - in production, this would be the actual Ed25519 public key
    // Ed25519 public keys are 32 bytes
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
];

/// Safety checker for pre-installation validation
pub struct SafetyChecker {
    config: UpgradeConfig,
    system: System,
}

/// System compatibility check result
#[derive(Debug, Clone)]
pub struct CompatibilityReport {
    pub os_compatible: bool,
    pub arch_compatible: bool,
    pub version_compatible: bool,
    pub dependencies_satisfied: bool,
    pub issues: Vec<String>,
    pub warnings: Vec<String>,
}

/// Resource availability check result
#[derive(Debug, Clone)]
pub struct ResourceReport {
    pub disk_space_sufficient: bool,
    pub memory_sufficient: bool,
    pub cpu_load_acceptable: bool,
    pub network_available: bool,
    pub available_disk_mb: u64,
    pub available_memory_mb: u64,
    pub cpu_usage_percent: f32,
    pub issues: Vec<String>,
}

impl SafetyChecker {
    /// Create a new safety checker
    pub fn new(config: &UpgradeConfig) -> Self {
        let mut system = System::new_all();
        system.refresh_all();

        Self {
            config: config.clone(),
            system,
        }
    }

    /// Perform comprehensive pre-installation safety checks
    pub async fn check_pre_installation(&mut self, update_info: &UpdateInfo) -> UpgradeResult<()> {
        info!("Running pre-installation safety checks");

        // Refresh system information
        self.system.refresh_all();

        // Run all safety checks
        if self.config.safety_checks.check_compatibility {
            self.check_system_compatibility(update_info).await?;
        }

        if self.config.safety_checks.check_disk_space {
            self.check_disk_space(update_info).await?;
        }

        if self.config.safety_checks.check_network {
            self.check_network_connectivity().await?;
        }

        if self.config.safety_checks.check_running_processes {
            self.check_running_processes().await?;
        }

        if self.config.safety_checks.check_dependencies {
            self.check_system_dependencies().await?;
        }

        info!("All pre-installation safety checks passed");
        Ok(())
    }

    /// Verify package integrity and authenticity
    pub async fn verify_package(
        &self,
        package_path: &PathBuf,
        update_info: &UpdateInfo,
    ) -> UpgradeResult<()> {
        info!("Verifying package integrity");

        // Check if file exists
        if !package_path.exists() {
            return Err(UpgradeError::InvalidPackage(
                "Package file not found".to_string(),
            ));
        }

        // Verify file size
        let file_size = std::fs::metadata(package_path)
            .map_err(|e| UpgradeError::InvalidPackage(e.to_string()))?
            .len();

        let platform = std::env::consts::OS;
        if let Some(expected_size) = update_info.size_bytes.get(platform) {
            if file_size != *expected_size {
                return Err(UpgradeError::VerificationFailed(format!(
                    "File size mismatch: expected {} bytes, got {} bytes",
                    expected_size, file_size
                )));
            }
        }

        // Verify file format based on extension
        self.verify_package_format(package_path).await?;

        // Verify digital signature if required
        if self.config.require_signatures {
            self.verify_package_signature(package_path, update_info)
                .await?;
        }

        // Additional malware scanning could go here
        if self.is_malware_scanning_available() {
            self.scan_for_malware(package_path).await?;
        }

        info!("Package verification completed successfully");
        Ok(())
    }

    /// Check system compatibility
    async fn check_system_compatibility(&self, update_info: &UpdateInfo) -> UpgradeResult<()> {
        debug!("Checking system compatibility");

        // Check OS compatibility
        let current_os = std::env::consts::OS;
        if !update_info.download_urls.contains_key(current_os) {
            return Err(UpgradeError::PlatformNotSupported(current_os.to_string()));
        }

        // Check architecture compatibility
        let current_arch = std::env::consts::ARCH;
        debug!("Current architecture: {}", current_arch);

        // Check minimum version requirements
        if let Some(min_version) = &update_info.minimum_version {
            let current_version = super::ApplicationVersion::current();
            if !current_version.is_compatible_with(min_version) {
                return Err(UpgradeError::VerificationFailed(format!(
                    "Current version {} is not compatible with minimum required version {}",
                    current_version.to_string(),
                    min_version.to_string()
                )));
            }
        }

        // Check system version (OS version)
        self.check_os_version_compatibility()?;

        Ok(())
    }

    /// Check available disk space
    async fn check_disk_space(&self, update_info: &UpdateInfo) -> UpgradeResult<()> {
        debug!("Checking disk space");

        let platform = std::env::consts::OS;
        let package_size = update_info.size_bytes.get(platform).copied().unwrap_or(0);

        // Account for decompression (estimate 3x package size)
        let required_space =
            package_size * 3 + (self.config.safety_checks.min_free_space_mb * 1024 * 1024);

        // Get available disk space
        let available_space = self.get_available_disk_space(&self.config.download_dir)?;

        if available_space < required_space {
            return Err(UpgradeError::InsufficientDiskSpace {
                required: required_space / 1024 / 1024,
                available: available_space / 1024 / 1024,
            });
        }

        debug!(
            "Disk space check passed: {} MB available, {} MB required",
            available_space / 1024 / 1024,
            required_space / 1024 / 1024
        );

        Ok(())
    }

    /// Check network connectivity
    async fn check_network_connectivity(&self) -> UpgradeResult<()> {
        debug!("Checking network connectivity");

        // Simple connectivity check - try to resolve a known domain
        let result = tokio::time::timeout(
            std::time::Duration::from_secs(10),
            tokio::net::lookup_host("api.github.com:443"),
        )
        .await;

        match result {
            Ok(Ok(_)) => {
                debug!("Network connectivity check passed");
                Ok(())
            }
            Ok(Err(e)) => Err(UpgradeError::NetworkError(format!(
                "DNS resolution failed: {}",
                e
            ))),
            Err(_) => Err(UpgradeError::NetworkError(
                "Network connectivity timeout".to_string(),
            )),
        }
    }

    /// Check for potentially interfering running processes
    async fn check_running_processes(&self) -> UpgradeResult<()> {
        debug!("Checking running processes");

        let dangerous_processes = vec!["antivirus", "scanner", "backup", "sync", "cloud"];

        for process in self.system.processes().values() {
            let process_name = process.name().to_lowercase();

            for dangerous in &dangerous_processes {
                if process_name.contains(dangerous) {
                    warn!(
                        "Potentially interfering process detected: {}",
                        process.name()
                    );
                    // For now, just warn. In production, you might want to:
                    // - Ask user to close the process
                    // - Automatically pause certain processes
                    // - Defer the upgrade
                }
            }
        }

        // Check if current application instances are running
        let current_exe =
            std::env::current_exe().map_err(|e| UpgradeError::Internal(e.to_string()))?;

        let current_name = current_exe
            .file_name()
            .and_then(|n| n.to_str())
            .unwrap_or("inferno");

        let mut running_instances = 0;
        for (pid, process) in self.system.processes() {
            if process.name().to_lowercase().contains("inferno")
                && *pid != sysinfo::get_current_pid().unwrap()
            {
                running_instances += 1;
            }
        }

        if running_instances > 0 {
            warn!(
                "Found {} other running instances of the application",
                running_instances
            );
        }

        Ok(())
    }

    /// Check system dependencies
    async fn check_system_dependencies(&self) -> UpgradeResult<()> {
        debug!("Checking system dependencies");

        // Check for required system libraries/tools
        #[cfg(target_os = "macos")]
        {
            self.check_macos_dependencies()?;
        }

        #[cfg(target_os = "linux")]
        {
            self.check_linux_dependencies()?;
        }

        #[cfg(target_os = "windows")]
        {
            self.check_windows_dependencies()?;
        }

        Ok(())
    }

    /// Verify package format
    async fn verify_package_format(&self, package_path: &PathBuf) -> UpgradeResult<()> {
        let extension = package_path
            .extension()
            .and_then(|ext| ext.to_str())
            .unwrap_or("");

        match extension.to_lowercase().as_str() {
            "tar" | "tgz" | "tar.gz" => self.verify_tar_format(package_path),
            "zip" => self.verify_zip_format(package_path),
            "pkg" => self.verify_pkg_format(package_path),
            "msi" | "exe" => self.verify_windows_format(package_path),
            "deb" => self.verify_deb_format(package_path),
            "rpm" => self.verify_rpm_format(package_path),
            _ => Err(UpgradeError::InvalidPackage(format!(
                "Unsupported package format: {}",
                extension
            ))),
        }
    }

    /// Verify digital signature using Ed25519
    async fn verify_package_signature(
        &self,
        package_path: &PathBuf,
        update_info: &UpdateInfo,
    ) -> UpgradeResult<()> {
        debug!("Verifying package digital signature");

        let platform = std::env::consts::OS;
        if let Some(signature_b64) = update_info.signatures.get(platform) {
            if signature_b64.is_empty() {
                return Err(UpgradeError::VerificationFailed(
                    "No signature provided".to_string(),
                ));
            }

            // Decode base64 signature
            let signature_bytes =
                base64::Engine::decode(&base64::engine::general_purpose::STANDARD, signature_b64)
                    .map_err(|e| {
                    UpgradeError::VerificationFailed(format!("Invalid signature encoding: {}", e))
                })?;

            // Read package file for verification
            let mut file = std::fs::File::open(package_path).map_err(|e| {
                UpgradeError::VerificationFailed(format!("Cannot open package: {}", e))
            })?;

            let mut package_bytes = Vec::new();
            file.read_to_end(&mut package_bytes).map_err(|e| {
                UpgradeError::VerificationFailed(format!("Cannot read package: {}", e))
            })?;

            // Create public key for verification
            let public_key = UnparsedPublicKey::new(&signature::ED25519, INFERNO_PUBLIC_KEY);

            // Verify signature
            public_key
                .verify(&package_bytes, &signature_bytes)
                .map_err(|_| {
                    UpgradeError::VerificationFailed(
                        "Signature verification failed - package may be tampered".to_string(),
                    )
                })?;

            info!("Package signature verified successfully");
        } else if self.config.require_signatures {
            return Err(UpgradeError::VerificationFailed(
                "Signature required but not provided".to_string(),
            ));
        }

        Ok(())
    }

    /// Scan for malware (if antivirus is available)
    async fn scan_for_malware(&self, package_path: &PathBuf) -> UpgradeResult<()> {
        debug!("Scanning package for malware");

        // This is a placeholder for malware scanning
        // In a real implementation, you might integrate with:
        // - Windows Defender API
        // - ClamAV on Linux
        // - Third-party antivirus APIs

        #[cfg(target_os = "windows")]
        {
            // Check Windows Defender
            if let Ok(output) = Command::new("powershell")
                .args(&[
                    "-Command",
                    "Get-MpComputerStatus | Select-Object RealTimeProtectionEnabled",
                ])
                .output()
            {
                if output.status.success() {
                    debug!("Windows Defender is available for scanning");
                }
            }
        }

        Ok(())
    }

    /// Check if malware scanning is available
    fn is_malware_scanning_available(&self) -> bool {
        #[cfg(target_os = "windows")]
        {
            Command::new("powershell")
                .args(&["-Command", "Get-MpComputerStatus"])
                .output()
                .map(|output| output.status.success())
                .unwrap_or(false)
        }

        #[cfg(target_os = "linux")]
        {
            Command::new("clamscan")
                .arg("--version")
                .output()
                .map(|output| output.status.success())
                .unwrap_or(false)
        }

        #[cfg(target_os = "macos")]
        {
            // macOS doesn't have built-in command-line antivirus
            false
        }

        #[cfg(not(any(target_os = "windows", target_os = "linux", target_os = "macos")))]
        {
            false
        }
    }

    /// Get available disk space for a given path
    fn get_available_disk_space(&self, path: &PathBuf) -> UpgradeResult<u64> {
        for disk in self.system.disks() {
            if path.starts_with(disk.mount_point()) {
                return Ok(disk.available_space());
            }
        }

        // Fallback: try to get space for root filesystem
        if let Some(root_disk) = self.system.disks().first() {
            Ok(root_disk.available_space())
        } else {
            Err(UpgradeError::Internal(
                "Cannot determine available disk space".to_string(),
            ))
        }
    }

    /// Check OS version compatibility
    fn check_os_version_compatibility(&self) -> UpgradeResult<()> {
        let os_version = self.system.os_version();
        debug!("OS version: {:?}", os_version);

        #[cfg(target_os = "macos")]
        {
            // Check minimum macOS version (example: 10.15+)
            if let Some(version) = os_version {
                if self.is_macos_version_too_old(&version) {
                    return Err(UpgradeError::PlatformNotSupported(format!(
                        "macOS version {} is too old. Minimum version required: 10.15",
                        version
                    )));
                }
            }
        }

        #[cfg(target_os = "linux")]
        {
            // Check kernel version and distribution
            if let Some(version) = os_version {
                debug!("Linux version: {}", version);
                // Additional Linux-specific checks could go here
            }
        }

        Ok(())
    }

    // Platform-specific dependency checks
    #[cfg(target_os = "macos")]
    fn check_macos_dependencies(&self) -> UpgradeResult<()> {
        // Check for required macOS frameworks/libraries
        debug!("Checking macOS dependencies");
        Ok(())
    }

    #[cfg(target_os = "linux")]
    fn check_linux_dependencies(&self) -> UpgradeResult<()> {
        // Check for required Linux libraries
        debug!("Checking Linux dependencies");
        Ok(())
    }

    #[cfg(target_os = "windows")]
    fn check_windows_dependencies(&self) -> UpgradeResult<()> {
        // Check for required Windows components
        debug!("Checking Windows dependencies");
        Ok(())
    }

    // Package format verification methods
    fn verify_tar_format(&self, path: &PathBuf) -> UpgradeResult<()> {
        // Basic tar file validation
        Command::new("tar")
            .args(["-tf", path.to_str().unwrap()])
            .output()
            .map_err(|e| UpgradeError::InvalidPackage(format!("Tar validation failed: {}", e)))
            .and_then(|output| {
                if output.status.success() {
                    Ok(())
                } else {
                    Err(UpgradeError::InvalidPackage(
                        "Invalid tar file format".to_string(),
                    ))
                }
            })
    }

    fn verify_zip_format(&self, path: &PathBuf) -> UpgradeResult<()> {
        // Basic zip file validation
        use std::fs::File;
        let file = File::open(path).map_err(|e| UpgradeError::InvalidPackage(e.to_string()))?;

        // Check ZIP magic bytes
        use std::io::Read;
        let mut magic = [0u8; 4];
        let mut reader = file;
        reader
            .read_exact(&mut magic)
            .map_err(|e| UpgradeError::InvalidPackage(e.to_string()))?;

        if &magic == b"PK\x03\x04" || &magic == b"PK\x05\x06" || &magic == b"PK\x07\x08" {
            Ok(())
        } else {
            Err(UpgradeError::InvalidPackage(
                "Invalid ZIP file format".to_string(),
            ))
        }
    }

    fn verify_pkg_format(&self, _path: &PathBuf) -> UpgradeResult<()> {
        // macOS pkg validation would go here
        Ok(())
    }

    fn verify_windows_format(&self, _path: &PathBuf) -> UpgradeResult<()> {
        // Windows MSI/EXE validation would go here
        Ok(())
    }

    fn verify_deb_format(&self, path: &PathBuf) -> UpgradeResult<()> {
        // Debian package validation
        Command::new("dpkg")
            .args(["--info", path.to_str().unwrap()])
            .output()
            .map_err(|e| UpgradeError::InvalidPackage(format!("DEB validation failed: {}", e)))
            .and_then(|output| {
                if output.status.success() {
                    Ok(())
                } else {
                    Err(UpgradeError::InvalidPackage(
                        "Invalid DEB package format".to_string(),
                    ))
                }
            })
    }

    fn verify_rpm_format(&self, path: &PathBuf) -> UpgradeResult<()> {
        // RPM package validation
        Command::new("rpm")
            .args(["-qp", path.to_str().unwrap()])
            .output()
            .map_err(|e| UpgradeError::InvalidPackage(format!("RPM validation failed: {}", e)))
            .and_then(|output| {
                if output.status.success() {
                    Ok(())
                } else {
                    Err(UpgradeError::InvalidPackage(
                        "Invalid RPM package format".to_string(),
                    ))
                }
            })
    }

    #[cfg(target_os = "macos")]
    fn is_macos_version_too_old(&self, version: &str) -> bool {
        // Simple version comparison for macOS
        // This is a simplified check - a real implementation would use proper version parsing
        let major_version = version
            .split('.')
            .next()
            .and_then(|s| s.parse::<u32>().ok())
            .unwrap_or(0);

        major_version < 10 || (major_version == 10 && self.get_macos_minor_version(version) < 15)
    }

    #[cfg(target_os = "macos")]
    fn get_macos_minor_version(&self, version: &str) -> u32 {
        version
            .split('.')
            .nth(1)
            .and_then(|s| s.parse::<u32>().ok())
            .unwrap_or(0)
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use tempfile::TempDir;

    fn create_test_config() -> UpgradeConfig {
        let temp_dir = TempDir::new().unwrap();
        UpgradeConfig {
            download_dir: temp_dir.path().to_path_buf(),
            backup_dir: temp_dir.path().to_path_buf(),
            ..Default::default()
        }
    }

    #[tokio::test]
    async fn test_safety_checker_creation() {
        let config = create_test_config();
        let checker = SafetyChecker::new(&config);
        assert!(checker.system.disks().len() > 0);
    }

    #[tokio::test]
    async fn test_network_connectivity() {
        let config = create_test_config();
        let checker = SafetyChecker::new(&config);

        // This test might fail in offline environments
        let result = checker.check_network_connectivity().await;
        if result.is_err() {
            println!(
                "Network connectivity test failed (expected in offline environments): {:?}",
                result
            );
        }
    }

    #[test]
    fn test_disk_space_calculation() {
        let config = create_test_config();
        let checker = SafetyChecker::new(&config);

        let space = checker.get_available_disk_space(&config.download_dir);
        assert!(space.is_ok());
        assert!(space.unwrap() > 0);
    }
}