nap-core 0.5.9

// SPDX-FileCopyrightText: 2026 Digital Creations
// SPDX-License-Identifier: MIT
//! Lore installer integration
//!
//! Integrates the official Lore installer behind `nap install lore`
//! to download, install, and verify Lore CLI and server binaries.

use crate::server::error_ids;
use crate::server::{PINNED_LORE_INSTALLER_SHA256, PINNED_LORE_REPOSITORY, PINNED_LORE_VERSION};
use anyhow::{Context, Result};
use sha2::{Digest, Sha256};
use std::fs::{self, OpenOptions};
use std::io::Write;
use std::process::Command;
use tracing::{error, info};
use which;

/// Lore installer for managing Lore CLI and server installation
pub struct LoreInstaller {
    install_dir: Option<std::path::PathBuf>,
    repo: String,
    version: String,
    installer_sha256: String,
}

impl LoreInstaller {
    /// Create a new Lore installer
    pub fn new(install_dir: Option<std::path::PathBuf>) -> Self {
        Self {
            install_dir,
            repo: PINNED_LORE_REPOSITORY.to_string(),
            version: PINNED_LORE_VERSION.to_string(),
            installer_sha256: PINNED_LORE_INSTALLER_SHA256.to_string(),
        }
    }

    /// Set custom repository
    pub fn with_repo(mut self, repo: &str) -> Self {
        self.repo = repo.to_string();
        self
    }

    /// Set custom version
    pub fn with_version(mut self, version: &str) -> Self {
        self.version = version.to_string();
        self
    }

    /// Set the expected checksum when deliberately selecting another release.
    pub fn with_installer_sha256(mut self, installer_sha256: &str) -> Self {
        self.installer_sha256 = installer_sha256.to_string();
        self
    }

    /// Return the version with a `v` prefix for GitHub release tag lookups.
    ///
    /// GitHub releases use tags like `v0.8.4`, but [`PINNED_LORE_VERSION`]
    /// and `lore --version` report `0.8.4` (no prefix). The install script
    /// resolves releases by tag, so we must add the prefix here.
    fn tag_version(&self) -> String {
        if self.version.starts_with('v') {
            self.version.clone()
        } else {
            format!("v{}", self.version)
        }
    }

    /// Install Lore CLI (only if not already installed with correct version)
    pub fn install_cli(&self) -> Result<()> {
        // Check if already installed with correct version
        if let Ok(verification) = self.verify_installation()
            && verification.cli_installed
            && let Some(installed_version) = &verification.cli_version
        {
            // Strip build metadata for comparison (e.g., "0.8.4+283" -> "0.8.4")
            let installed_version_clean = installed_version
                .split('+')
                .next()
                .unwrap_or(installed_version);
            if installed_version_clean == self.version {
                info!(
                    "Lore CLI already installed with correct version {}",
                    installed_version
                );
                return Ok(());
            }
            info!(
                "Lore CLI installed but version mismatch: installed {}, required {}",
                installed_version, self.version
            );
        }

        info!(
            "Installing Lore CLI from {} version {}",
            self.repo, self.version
        );

        self.run_install_script(&["--version", &self.tag_version()])?;

        info!("Lore CLI installed successfully");
        Ok(())
    }

    /// Install Lore server (only if not already installed with correct version)
    pub fn install_server(&self) -> Result<()> {
        // Check if already installed with correct version
        if let Ok(verification) = self.verify_installation()
            && verification.server_installed
            && let Some(installed_version) = &verification.server_version
        {
            // Strip build metadata for comparison (e.g., "0.8.4+283" -> "0.8.4")
            let installed_version_clean = installed_version
                .split('+')
                .next()
                .unwrap_or(installed_version);
            if installed_version_clean == self.version {
                info!(
                    "Lore server already installed with correct version {}",
                    installed_version
                );
                return Ok(());
            }
            info!(
                "Lore server installed but version mismatch: installed {}, required {}",
                installed_version, self.version
            );
        }

        info!(
            "Installing Lore server from {} version {}",
            self.repo, self.version
        );

        self.run_install_script(&["--server", "--version", &self.tag_version()])?;

        info!("Lore server installed successfully");
        Ok(())
    }

    /// Install both CLI and server (only if not already installed with correct versions)
    pub fn install_all(&self) -> Result<()> {
        info!(
            "Checking Lore installation status for version {}",
            self.version
        );

        // The Lore install script installs one binary at a time:
        //   no flags  → lore CLI only
        //   --server  → loreserver only
        // Run it twice to get both.
        self.install_cli()?;
        self.install_server()?;

        info!("Lore CLI and server installation verified");
        Ok(())
    }

    /// Run the official Lore install script
    fn run_install_script(&self, args: &[&str]) -> Result<()> {
        let script_url = format!(
            "https://raw.githubusercontent.com/{}/{}/scripts/install.sh",
            self.repo,
            self.tag_version(),
        );

        // Download script
        let script_path = self.download_script(&script_url)?;

        // Make script executable
        #[cfg(unix)]
        {
            use std::os::unix::fs::PermissionsExt;
            let mut perms = fs::metadata(&script_path)?.permissions();
            perms.set_mode(0o700);
            fs::set_permissions(&script_path, perms)?;
        }

        // Build command with install directory and other args
        let script_arg = script_path
            .to_str()
            .context("Lore installer temporary path is not valid UTF-8")?;
        let mut cmd_args = vec![script_arg];
        if let Some(dir) = &self.install_dir {
            cmd_args.push("--install-dir");
            cmd_args.push(
                dir.to_str()
                    .context("Lore installation directory is not valid UTF-8")?,
            );
        }
        cmd_args.push("--repo");
        cmd_args.push(&self.repo);
        cmd_args.extend(args.iter().copied());

        // Execute script
        let output_result = Command::new("bash").args(&cmd_args).output();

        // Remove the downloaded program even when process creation fails, and
        // before examining the exit status, so executable material is never
        // left in a shared temp directory.
        fs::remove_file(&script_path).context("Failed to remove Lore installer script")?;
        let output = output_result.context(format!(
            "[{}] Failed to execute Lore install script",
            error_ids::ERR_LORE_INSTALL_FAILED
        ))?;

        if !output.status.success() {
            let stderr = String::from_utf8_lossy(&output.stderr);
            error!(
                "[{}] Lore install script failed: {}",
                error_ids::ERR_LORE_INSTALL_FAILED,
                stderr
            );
            anyhow::bail!(
                "[{}] Lore install script failed with status: {}",
                error_ids::ERR_LORE_INSTALL_FAILED,
                output.status
            );
        }

        Ok(())
    }

    /// Download install script to temporary location
    fn download_script(&self, url: &str) -> Result<std::path::PathBuf> {
        let response = reqwest::blocking::get(url).context(format!(
            "[{}] Failed to download Lore install script",
            error_ids::ERR_LORE_DOWNLOAD_FAILED
        ))?;

        if !response.status().is_success() {
            anyhow::bail!(
                "[{}] Failed to download script: HTTP {}",
                error_ids::ERR_LORE_DOWNLOAD_FAILED,
                response.status()
            );
        }

        let script_content = response.bytes().context(format!(
            "[{}] Failed to read installer bytes",
            error_ids::ERR_LORE_DOWNLOAD_FAILED
        ))?;

        let actual_sha256 = hex::encode(Sha256::digest(&script_content));
        if actual_sha256 != self.installer_sha256 {
            anyhow::bail!(
                "[{}] Lore installer checksum mismatch for {} {}: expected {}, got {}",
                error_ids::ERR_LORE_DOWNLOAD_FAILED,
                self.repo,
                self.tag_version(),
                self.installer_sha256,
                actual_sha256,
            );
        }

        // create_new prevents symlink-following and pre-creation attacks. PID
        // plus a cryptographically random nonce avoids cross-process and
        // concurrent-use collisions without trusting a predictable filename.
        let nonce = rand::random::<u64>();
        let script_path = std::env::temp_dir().join(format!(
            "nap-lore-install-{}-{nonce:016x}.sh",
            std::process::id(),
        ));
        let mut script_file = OpenOptions::new()
            .write(true)
            .create_new(true)
            .open(&script_path)
            .context(format!(
                "[{}] Failed to create installer safely",
                error_ids::ERR_LORE_DOWNLOAD_FAILED
            ))?;
        script_file.write_all(&script_content).context(format!(
            "[{}] Failed to write install script",
            error_ids::ERR_LORE_DOWNLOAD_FAILED
        ))?;

        Ok(script_path)
    }

    /// Verify installation
    pub fn verify_installation(&self) -> Result<VerificationResult> {
        let cli_installed = self.check_binary("lore");
        let server_installed = self.check_binary("loreserver");

        let cli_version = if cli_installed {
            self.get_binary_version("lore").ok()
        } else {
            None
        };

        let server_version = if server_installed {
            self.get_binary_version("loreserver").ok()
        } else {
            None
        };

        Ok(VerificationResult {
            cli_installed,
            cli_version,
            server_installed,
            server_version,
        })
    }

    /// Check if binary exists and is executable
    fn check_binary(&self, name: &str) -> bool {
        if let Some(dir) = &self.install_dir {
            let binary_path = dir.join(name);
            binary_path.exists() && binary_path.is_file()
        } else {
            // Check system PATH
            which::which(name).is_ok()
        }
    }

    /// Get version from binary
    ///
    /// Handles both output formats:
    /// - `"0.8.4+283"` (just the version)
    /// - `"lore 0.8.4+283"` (program name prefix, common on macOS)
    ///
    /// Returns the clean version string (e.g. `"0.8.4+283"`).
    fn get_binary_version(&self, name: &str) -> Result<String> {
        let binary_path = if let Some(dir) = &self.install_dir {
            dir.join(name).to_str().unwrap().to_string()
        } else {
            name.to_string() // Rely on PATH
        };

        let output = Command::new(&binary_path)
            .arg("--version")
            .output()
            .context(format!("Failed to execute {} --version", binary_path))?;

        if !output.status.success() {
            anyhow::bail!("{} --version failed", name);
        }

        let raw = String::from_utf8_lossy(&output.stdout).trim().to_string();
        Ok(parse_version_output(&raw))
    }

    /// Add install directory to PATH
    pub fn add_to_path(&self) -> Result<()> {
        let install_dir = if let Some(dir) = &self.install_dir {
            dir
        } else {
            return Ok(()); // Already in PATH or system default
        };

        let install_dir_str = install_dir
            .to_str()
            .context("Install directory path is not valid UTF-8")?;

        // Check if already in PATH
        if let Ok(current_path) = std::env::var("PATH")
            && current_path.contains(install_dir_str)
        {
            info!("Install directory already in PATH");
            return Ok(());
        }

        // Add to current process PATH
        let new_path = format!(
            "{}:{}",
            install_dir_str,
            std::env::var("PATH").unwrap_or_default()
        );
        unsafe {
            std::env::set_var("PATH", &new_path);
        }

        info!("Added {} to PATH for current process", install_dir_str);
        Ok(())
    }
}

/// Parse the output of `lore --version` (or `loreserver --version`).
///
/// Handles:
/// - `"0.8.4+283"` -> `"0.8.4+283"`
/// - `"lore 0.8.4+283"` -> `"0.8.4+283"`
/// - `"my-tool 1.2.3"` -> `"1.2.3"`
pub fn parse_version_output(raw: &str) -> String {
    let raw = raw.trim();
    if let Some(pos) = raw.rfind(' ') {
        // Take the last token after the final space
        raw[pos + 1..].to_string()
    } else {
        raw.to_string()
    }
}

/// Result of installation verification
#[derive(Debug, Clone)]
pub struct VerificationResult {
    pub cli_installed: bool,
    pub cli_version: Option<String>,
    pub server_installed: bool,
    pub server_version: Option<String>,
}

impl VerificationResult {
    /// Check if installation is complete
    pub fn is_complete(&self) -> bool {
        self.cli_installed && self.server_installed
    }

    /// Get a human-readable status message
    pub fn status_message(&self) -> String {
        let mut parts = vec![];

        if self.cli_installed {
            parts.push(format!(
                "Lore CLI installed ({})",
                self.cli_version.as_deref().unwrap_or("unknown")
            ));
        } else {
            parts.push("Lore CLI not installed".to_string());
        }

        if self.server_installed {
            parts.push(format!(
                "Lore server installed ({})",
                self.server_version.as_deref().unwrap_or("unknown")
            ));
        } else {
            parts.push("Lore server not installed".to_string());
        }

        parts.join("; ")
    }
}

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

    #[test]
    fn test_installer_creation() {
        let temp_dir = TempDir::new().unwrap();
        let installer = LoreInstaller::new(Some(temp_dir.path().to_path_buf()));
        assert_eq!(installer.repo, PINNED_LORE_REPOSITORY);
        assert_eq!(installer.version, PINNED_LORE_VERSION);
        assert_eq!(installer.installer_sha256, PINNED_LORE_INSTALLER_SHA256);
        // Tag version must have the `v` prefix for GitHub release lookups
        assert_eq!(installer.tag_version(), format!("v{}", PINNED_LORE_VERSION));
    }

    #[test]
    fn test_tag_version_prefix() {
        let temp_dir = TempDir::new().unwrap();
        let installer = LoreInstaller::new(Some(temp_dir.path().to_path_buf()));
        assert_eq!(installer.tag_version(), "v0.8.4");

        // Already prefixed — should not double-prefix
        let installer2 =
            LoreInstaller::new(Some(temp_dir.path().to_path_buf())).with_version("v1.0.0");
        assert_eq!(installer2.tag_version(), "v1.0.0");
    }

    #[test]
    fn test_parse_version_output() {
        assert_eq!(parse_version_output("0.8.4+283"), "0.8.4+283");
        assert_eq!(parse_version_output("lore 0.8.4+283"), "0.8.4+283");
        assert_eq!(parse_version_output("loreserver 0.8.4+283"), "0.8.4+283");
        assert_eq!(parse_version_output("my-tool 1.2.3"), "1.2.3");
        assert_eq!(parse_version_output("some-tool"), "some-tool");
    }

    #[test]
    fn test_installer_custom_repo() {
        let temp_dir = TempDir::new().unwrap();
        let installer = LoreInstaller::new(Some(temp_dir.path().to_path_buf()))
            .with_repo("custom/repo")
            .with_version("v1.0.0");
        assert_eq!(installer.repo, "custom/repo");
        assert_eq!(installer.version, "v1.0.0");
    }

    #[test]
    fn test_verification_result() {
        let result = VerificationResult {
            cli_installed: true,
            cli_version: Some("0.8.4".to_string()),
            server_installed: false,
            server_version: None,
        };

        assert!(!result.is_complete());
        assert!(result.status_message().contains("Lore CLI installed"));
        assert!(
            result
                .status_message()
                .contains("Lore server not installed")
        );
    }
}