import { spawn } from "child_process";

export class Router {

	constructor () {
		this.callbacks = { };
		this.stdoutBuffer = "";
		this.onmessage = null;
	}

	async callMethod ( method, params = { } ) {
		const child = spawn( "python3", [ "index.py", method, JSON.stringify( params ) ] );

		return await new Promise( ( resolve, reject ) => {
			let result = "";

			child.stdout.on( "data", ( data ) => {
				const lines = data.toString().split( "\n" );

				for ( const line of lines ) {
					if ( line.startsWith( "__STREAM__" ) ) {
						const payload = line.substring( 10 ).trim();

						if ( this.onmessage ) {
							this.onmessage( JSON.parse( payload ) );
						}
					} else if ( line.trim() ) {
						result += line.trim();
					}
				}
			} );

			child.stderr.on( "data", ( err ) => {
				reject( new Error( err.toString() ) );
			} );

			child.on( "close", () => {
				try {
					resolve( JSON.parse( result ) );
				} catch ( err ) {
					reject( new Error( "Failed to parse response: " + result ) );
				}
			} );
		} );
	}
}