import chalk from "chalk";
import { spawnSync } from "child_process";
import extractZip from "extract-zip";
import { chmodSync, createWriteStream, existsSync, mkdirSync, readdirSync, renameSync, rmSync } from "fs";
import { arch, platform } from "os";
import { join } from "path";
import { Readable } from "stream";
import { pipeline } from "stream/promises";
import { APP_NAME, getBinDir } from "../config.js";
const TOOLS_DIR = getBinDir();
const NETWORK_TIMEOUT_MS = 10_000;
const DOWNLOAD_TIMEOUT_MS = 120_000;
function isOfflineModeEnabled() {
    const value = process.env.PI_OFFLINE;
    if (!value)
        return false;
    return value === "1" || value.toLowerCase() === "true" || value.toLowerCase() === "yes";
}
const TOOLS = {
    fd: {
        name: "fd",
        repo: "sharkdp/fd",
        binaryName: "fd",
        tagPrefix: "v",
        getAssetName: (version, plat, architecture) => {
            if (plat === "darwin") {
                const archStr = architecture === "arm64" ? "aarch64" : "x86_64";
                return `fd-v${version}-${archStr}-apple-darwin.tar.gz`;
            }
            else if (plat === "linux") {
                const archStr = architecture === "arm64" ? "aarch64" : "x86_64";
                return `fd-v${version}-${archStr}-unknown-linux-gnu.tar.gz`;
            }
            else if (plat === "win32") {
                const archStr = architecture === "arm64" ? "aarch64" : "x86_64";
                return `fd-v${version}-${archStr}-pc-windows-msvc.zip`;
            }
            return null;
        },
    },
    rg: {
        name: "ripgrep",
        repo: "BurntSushi/ripgrep",
        binaryName: "rg",
        tagPrefix: "",
        getAssetName: (version, plat, architecture) => {
            if (plat === "darwin") {
                const archStr = architecture === "arm64" ? "aarch64" : "x86_64";
                return `ripgrep-${version}-${archStr}-apple-darwin.tar.gz`;
            }
            else if (plat === "linux") {
                if (architecture === "arm64") {
                    return `ripgrep-${version}-aarch64-unknown-linux-gnu.tar.gz`;
                }
                return `ripgrep-${version}-x86_64-unknown-linux-musl.tar.gz`;
            }
            else if (plat === "win32") {
                const archStr = architecture === "arm64" ? "aarch64" : "x86_64";
                return `ripgrep-${version}-${archStr}-pc-windows-msvc.zip`;
            }
            return null;
        },
    },
};
// Check if a command exists in PATH by trying to run it
function commandExists(cmd) {
    try {
        const result = spawnSync(cmd, ["--version"], { stdio: "pipe" });
        // Check for ENOENT error (command not found)
        return result.error === undefined || result.error === null;
    }
    catch {
        return false;
    }
}
// Get the path to a tool (system-wide or in our tools dir)
export function getToolPath(tool) {
    const config = TOOLS[tool];
    if (!config)
        return null;
    // Check our tools directory first
    const localPath = join(TOOLS_DIR, config.binaryName + (platform() === "win32" ? ".exe" : ""));
    if (existsSync(localPath)) {
        return localPath;
    }
    // Check system PATH - if found, just return the command name (it's in PATH)
    if (commandExists(config.binaryName)) {
        return config.binaryName;
    }
    return null;
}
// Fetch latest release version from GitHub
async function getLatestVersion(repo) {
    const response = await fetch(`https://api.github.com/repos/${repo}/releases/latest`, {
        headers: { "User-Agent": `${APP_NAME}-coding-agent` },
        signal: AbortSignal.timeout(NETWORK_TIMEOUT_MS),
    });
    if (!response.ok) {
        throw new Error(`GitHub API error: ${response.status}`);
    }
    const data = (await response.json());
    return data.tag_name.replace(/^v/, "");
}
// Download a file from URL
async function downloadFile(url, dest) {
    const response = await fetch(url, {
        signal: AbortSignal.timeout(DOWNLOAD_TIMEOUT_MS),
    });
    if (!response.ok) {
        throw new Error(`Failed to download: ${response.status}`);
    }
    if (!response.body) {
        throw new Error("No response body");
    }
    const fileStream = createWriteStream(dest);
    await pipeline(Readable.fromWeb(response.body), fileStream);
}
function findBinaryRecursively(rootDir, binaryFileName) {
    const stack = [rootDir];
    while (stack.length > 0) {
        const currentDir = stack.pop();
        if (!currentDir)
            continue;
        const entries = readdirSync(currentDir, { withFileTypes: true });
        for (const entry of entries) {
            const fullPath = join(currentDir, entry.name);
            if (entry.isFile() && entry.name === binaryFileName) {
                return fullPath;
            }
            if (entry.isDirectory()) {
                stack.push(fullPath);
            }
        }
    }
    return null;
}
// Download and install a tool
async function downloadTool(tool) {
    const config = TOOLS[tool];
    if (!config)
        throw new Error(`Unknown tool: ${tool}`);
    const plat = platform();
    const architecture = arch();
    // Get latest version
    const version = await getLatestVersion(config.repo);
    // Get asset name for this platform
    const assetName = config.getAssetName(version, plat, architecture);
    if (!assetName) {
        throw new Error(`Unsupported platform: ${plat}/${architecture}`);
    }
    // Create tools directory
    mkdirSync(TOOLS_DIR, { recursive: true });
    const downloadUrl = `https://github.com/${config.repo}/releases/download/${config.tagPrefix}${version}/${assetName}`;
    const archivePath = join(TOOLS_DIR, assetName);
    const binaryExt = plat === "win32" ? ".exe" : "";
    const binaryPath = join(TOOLS_DIR, config.binaryName + binaryExt);
    // Download
    await downloadFile(downloadUrl, archivePath);
    // Extract into a unique temp directory. fd and rg downloads can run concurrently
    // during startup, so sharing a fixed directory causes races.
    const extractDir = join(TOOLS_DIR, `extract_tmp_${config.binaryName}_${process.pid}_${Date.now()}_${Math.random().toString(36).slice(2, 10)}`);
    mkdirSync(extractDir, { recursive: true });
    try {
        if (assetName.endsWith(".tar.gz")) {
            const extractResult = spawnSync("tar", ["xzf", archivePath, "-C", extractDir], { stdio: "pipe" });
            if (extractResult.error || extractResult.status !== 0) {
                const errMsg = extractResult.error?.message ?? extractResult.stderr?.toString().trim() ?? "unknown error";
                throw new Error(`Failed to extract ${assetName}: ${errMsg}`);
            }
        }
        else if (assetName.endsWith(".zip")) {
            await extractZip(archivePath, { dir: extractDir });
        }
        else {
            throw new Error(`Unsupported archive format: ${assetName}`);
        }
        // Find the binary in extracted files. Some archives contain files directly
        // at root, others nest under a versioned subdirectory.
        const binaryFileName = config.binaryName + binaryExt;
        const extractedDir = join(extractDir, assetName.replace(/\.(tar\.gz|zip)$/, ""));
        const extractedBinaryCandidates = [join(extractedDir, binaryFileName), join(extractDir, binaryFileName)];
        let extractedBinary = extractedBinaryCandidates.find((candidate) => existsSync(candidate));
        if (!extractedBinary) {
            extractedBinary = findBinaryRecursively(extractDir, binaryFileName) ?? undefined;
        }
        if (extractedBinary) {
            renameSync(extractedBinary, binaryPath);
        }
        else {
            throw new Error(`Binary not found in archive: expected ${binaryFileName} under ${extractDir}`);
        }
        // Make executable (Unix only)
        if (plat !== "win32") {
            chmodSync(binaryPath, 0o755);
        }
    }
    finally {
        // Cleanup
        rmSync(archivePath, { force: true });
        rmSync(extractDir, { recursive: true, force: true });
    }
    return binaryPath;
}
// Termux package names for tools
const TERMUX_PACKAGES = {
    fd: "fd",
    rg: "ripgrep",
};
// Ensure a tool is available, downloading if necessary
// Returns the path to the tool, or null if unavailable
export async function ensureTool(tool, silent = false) {
    const existingPath = getToolPath(tool);
    if (existingPath) {
        return existingPath;
    }
    const config = TOOLS[tool];
    if (!config)
        return undefined;
    if (isOfflineModeEnabled()) {
        if (!silent) {
            console.log(chalk.yellow(`${config.name} not found. Offline mode enabled, skipping download.`));
        }
        return undefined;
    }
    // On Android/Termux, Linux binaries don't work due to Bionic libc incompatibility.
    // Users must install via pkg.
    if (platform() === "android") {
        const pkgName = TERMUX_PACKAGES[tool] ?? tool;
        if (!silent) {
            console.log(chalk.yellow(`${config.name} not found. Install with: pkg install ${pkgName}`));
        }
        return undefined;
    }
    // Tool not found - download it
    if (!silent) {
        console.log(chalk.dim(`${config.name} not found. Downloading...`));
    }
    try {
        const path = await downloadTool(tool);
        if (!silent) {
            console.log(chalk.dim(`${config.name} installed to ${path}`));
        }
        return path;
    }
    catch (e) {
        if (!silent) {
            console.log(chalk.yellow(`Failed to download ${config.name}: ${e instanceof Error ? e.message : e}`));
        }
        return undefined;
    }
}
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