const { spawn } = require('child_process');

const Runner = require('./Runner');

class JavaRunner extends Runner {

defaultFile() {

return this.defaultfile;

}

constructor() {

super();

this.defaultfile = 'Hello.java';

}

run(file, directory, filename, extension, callback) {

if (extension.toLowerCase() !== '.java') {

console.log(`${file} is not a java file.`);

}

this.compile(file, directory, filename, callback);

}

// compile java source file

compile(file, directory, filename, callback) {

// set working directory for child_process

const options = { cwd: directory };

// var compiler = spawn('javac', ['CodeJava.java']);

const argsCompile = [];

argsCompile[0] = file;

const compiler = spawn('javac', argsCompile);

compiler.stdout.on('data', (data) => {

console.log(`stdout: ${data}`);

});

compiler.stderr.on('data', (data) => {

console.log(`compile-stderr: ${String(data)}`);

callback('1', String(data)); // 1, compile error

});

compiler.on('close', (data) => {

if (data === 0) {

this.execute(filename, options, callback);

}

});

}

// execute the compiled class file

execute(filename, options, callback) {

const argsRun = [];

argsRun[0] = filename;

const executor = spawn('java', argsRun, options);

executor.stdout.on('data', (output) => {

console.log(String(output));

callback('0', String(output)); // 0, no error

});

executor.stderr.on('data', (output) => {

console.log(`stderr: ${String(output)}`);

callback('2', String(output)); // 2, execution failure

});

executor.on('close', (output) => {

this.log(`stdout: ${output}`);

});

}

log(message) {

console.log(message);

}

}

module.exports = JavaRunner;