/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import path from 'node:path';
import os from 'os';
import * as crypto from 'crypto';
import * as fs from 'fs';
export const LLXPRT_DIR = '.llxprt';
export const GOOGLE_ACCOUNTS_FILENAME = 'google_accounts.json';
export function ensureLlxprtDirExists() {
    const homeDir = os.homedir();
    const llxprtDir = path.join(homeDir, LLXPRT_DIR);
    if (!fs.existsSync(llxprtDir)) {
        fs.mkdirSync(llxprtDir, { recursive: true });
    }
}
/**
 * Special characters that need to be escaped in file paths for shell compatibility.
 * Includes: spaces, parentheses, brackets, braces, semicolons, ampersands, pipes,
 * asterisks, question marks, dollar signs, backticks, quotes, hash, and other shell metacharacters.
 */
export const SHELL_SPECIAL_CHARS = /[ \t()[\]{};|*?$`'"#&<>!~]/;
/**
 * Replaces the home directory with a tilde.
 * @param path - The path to tildeify.
 * @returns The tildeified path.
 */
export function tildeifyPath(path) {
    const homeDir = os.homedir();
    if (path.startsWith(homeDir)) {
        return path.replace(homeDir, '~');
    }
    return path;
}
/**
 * Shortens a path string if it exceeds maxLen, prioritizing the start and end segments.
 * Example: /path/to/a/very/long/file.txt -> /path/.../long/file.txt
 */
export function shortenPath(filePath, maxLen = 35) {
    if (filePath.length <= maxLen) {
        return filePath;
    }
    const parsedPath = path.parse(filePath);
    const root = parsedPath.root;
    const separator = path.sep;
    // Get segments of the path *after* the root
    const relativePath = filePath.substring(root.length);
    const segments = relativePath.split(separator).filter((s) => s !== ''); // Filter out empty segments
    // Handle cases with no segments after root (e.g., "/", "C:\") or only one segment
    if (segments.length <= 1) {
        // Fall back to simple start/end truncation for very short paths or single segments
        const keepLen = Math.floor((maxLen - 3) / 2);
        // Ensure keepLen is not negative if maxLen is very small
        if (keepLen <= 0) {
            return filePath.substring(0, maxLen - 3) + '...';
        }
        const start = filePath.substring(0, keepLen);
        const end = filePath.substring(filePath.length - keepLen);
        return `${start}...${end}`;
    }
    const firstDir = segments[0];
    const lastSegment = segments[segments.length - 1];
    const startComponent = root + firstDir;
    const endPartSegments = [];
    // Base length: separator + "..." + lastDir
    let currentLength = separator.length + lastSegment.length;
    // Iterate backwards through segments (excluding the first one)
    for (let i = segments.length - 2; i >= 0; i--) {
        const segment = segments[i];
        // Length needed if we add this segment: current + separator + segment
        const lengthWithSegment = currentLength + separator.length + segment.length;
        if (lengthWithSegment <= maxLen) {
            endPartSegments.unshift(segment); // Add to the beginning of the end part
            currentLength = lengthWithSegment;
        }
        else {
            break;
        }
    }
    let result = endPartSegments.join(separator) + separator + lastSegment;
    if (currentLength > maxLen) {
        return result;
    }
    // Construct the final path
    result = startComponent + separator + result;
    // As a final check, if the result is somehow still too long
    // truncate the result string from the beginning, prefixing with "...".
    if (result.length > maxLen) {
        return '...' + result.substring(result.length - maxLen - 3);
    }
    return result;
}
/**
 * Calculates the relative path from a root directory to a target path.
 * Ensures both paths are resolved before calculating.
 * Returns '.' if the target path is the same as the root directory.
 *
 * @param targetPath The absolute or relative path to make relative.
 * @param rootDirectory The absolute path of the directory to make the target path relative to.
 * @returns The relative path from rootDirectory to targetPath.
 */
export function makeRelative(targetPath, rootDirectory) {
    const resolvedTargetPath = path.resolve(targetPath);
    const resolvedRootDirectory = path.resolve(rootDirectory);
    const relativePath = path.relative(resolvedRootDirectory, resolvedTargetPath);
    // If the paths are the same, path.relative returns '', return '.' instead
    return relativePath || '.';
}
/**
 * Escapes special characters in a file path like macOS terminal does.
 * Escapes: spaces, parentheses, brackets, braces, semicolons, ampersands, pipes,
 * asterisks, question marks, dollar signs, backticks, quotes, hash, and other shell metacharacters.
 */
export function escapePath(filePath) {
    let result = '';
    for (let i = 0; i < filePath.length; i++) {
        const char = filePath[i];
        // Count consecutive backslashes before this character
        let backslashCount = 0;
        for (let j = i - 1; j >= 0 && filePath[j] === '\\'; j--) {
            backslashCount++;
        }
        // Character is already escaped if there's an odd number of backslashes before it
        const isAlreadyEscaped = backslashCount % 2 === 1;
        // Only escape if not already escaped
        if (!isAlreadyEscaped && SHELL_SPECIAL_CHARS.test(char)) {
            result += '\\' + char;
        }
        else {
            result += char;
        }
    }
    return result;
}
/**
 * Unescapes special characters in a file path.
 * Removes backslash escaping from shell metacharacters.
 */
export function unescapePath(filePath) {
    return filePath.replace(new RegExp(`\\\\([${SHELL_SPECIAL_CHARS.source.slice(1, -1)}])`, 'g'), '$1');
}
/**
 * Generates a unique hash for a project based on its root path.
 * @param projectRoot The absolute path to the project's root directory.
 * @returns A SHA256 hash of the project root path.
 */
export function getProjectHash(projectRoot) {
    return crypto.createHash('sha256').update(projectRoot).digest('hex');
}
/**
 * Checks if a path is a subpath of another path.
 * @param parentPath The parent path.
 * @param childPath The child path.
 * @returns True if childPath is a subpath of parentPath, false otherwise.
 */
export function isSubpath(parentPath, childPath) {
    const isWindows = os.platform() === 'win32';
    const pathModule = isWindows ? path.win32 : path;
    // On Windows, path.relative is case-insensitive. On POSIX, it's case-sensitive.
    const relative = pathModule.relative(parentPath, childPath);
    return (!relative.startsWith(`..${pathModule.sep}`) &&
        relative !== '..' &&
        !pathModule.isAbsolute(relative));
}
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