const readline = require('readline')

// const xstdin = (prompt, input) => {
//     const rl = readline.createInterface({
//         input: input || process.stdin
//     })
//     return async function* () {
//         return await new Promise((resolve) => {
//             rl.question(prompt, resolve)
//         })
//     }
// }

// stdin = () => async function* stdin() {
//     const done = new Promise(resolve => process.stdin.once('end', x => resolve(null)))
//     let data
//     do {
//         data = await Promise.race([
//             new Promise(resolve => process.stdin.once('data', resolve)),
//             done
//         ])
//         console.log(data)
//         if (data) yield data
//     } while (data)
// }

const stdin = () => {
    return async function*() {
        return await new Promise(resolve => {
            const onData = (data) => {
                resolve(data.toString().trim())
                cleanup()
            }
            const onEnd = () => {
                resolve('')
                cleanup()
            }
            const cleanup = () => {
                process.stdin.off('data', onData)
                process.stdin.off('end', onEnd)
            }
            process.stdin.on('data', onData)
            process.stdin.on('end', onEnd)
        })
    }
}

const stdout = () => async function* stdout(output, scripting) {
    process.stdout.write(output)
}

module.exports = {stdin, stdout}