import path from "path";
import { CBFileSystem } from "../node/file-system";

/**
 * Package validator for validating app structure.
 * This primarily validates the app directory and the structure of the app which developer bundles and uploads to Chargebee.
 */
export class PackageValidator {

    private fileSystem: CBFileSystem;

    constructor(fileSystem: CBFileSystem) {
        this.fileSystem = fileSystem;
    }

    /**
     * Validates that the app directory exists
     * @param {string} targetDir - Target directory path
     * @returns {boolean} True if directory exists
     */
    validateAppDirectoryExists(targetDir: string): boolean {
        return this.fileSystem.existsSync(targetDir);
    }

    /**
     * Validates that manifest.json exists in the app directory
     * @param {string} targetDir - Target directory path
     * @returns {boolean} True if manifest.json exists
     */
    validateManifestExists(targetDir: string): boolean {
        const manifestPath = path.join(targetDir, 'manifest.json');
        return this.fileSystem.existsSync(manifestPath);
    }

    /**
     * Validates that handler.js exists in the app directory
     * @param {string} targetDir - Target directory path
     * @returns {boolean} True if handler.js exists
     */
    validateHandlerExists(targetDir: string): boolean {
        const handlerPath = path.join(targetDir, 'handler', 'handler.js');
        return this.fileSystem.existsSync(handlerPath);
    }
}