/**
 * Process interface provides a typed abstraction over common Node.js 
 * process-level operations. 
 * 
 * It covers process lifecycle control, environment variables, 
 * current working directory management, and event handling.
 */
export interface CBProcess {
    /** Changes the current working directory */
    chdir: (path: string) => void;
    /** Terminates the Node.js process */
    exit: (code?: number) => never;
    /** Returns the current working directory */
    cwd: () => string;
    /** Access to environment variables */
    env: NodeJS.ProcessEnv;
    /** Registers an event listener */
    on: (event: string, listener: (...args: any[]) => void) => void;
}

/**
   * ProcessService provides a class-based implementation of the Process interface.
   * Use this for dependency injection for all the process operations, and for testing we can use custom implemenatation if needed.
   */
export class ProcessService implements CBProcess {
    chdir(path: string): void {
        process.chdir(path);
    }

    cwd(): string {
        return process.cwd();
    }

    exit(code?: number): never {
        process.exit(code);
    }

    on(event: string, listener: (...args: any[]) => void): void {
        process.on(event, listener);
    }

    get env(): NodeJS.ProcessEnv {
        return process.env;
    }
}