import { getInput, getMultilineInput, info } from '@actions/core'

const crypto = require('crypto')
const fs = require('fs')

function getFileHash256(fileName) {
    return new Promise((resolve, reject) => {
        const hash = crypto.createHash('sha256')

        var reader = fs.createReadStream(fileName)

        reader.pipe(hash)

        reader.on('end', function () {
            resolve(hash.digest('hex'))
        })

        reader.on('error', function (error) {
            reject(error)
        })
    })

}


export function isExactKeyMatch(key, cacheKey) {
    return !!(
        cacheKey &&
        cacheKey.localeCompare(key, undefined, {
            sensitivity: "accent"
        }) === 0
    )
}

export const mounts = getMultilineInput('mount', { require: true, trimWhitespace: true })

export const { primaryKey, restoreKeys } = await async function () {

    const key = getInput('key', { required: true, trimWhitespace: true }).replace('/', '-')

    const os = process.env.RUNNER_OS

    let primaryKey, restoreKeys = []

    const hashFiles = getMultilineInput('hash_files', { trimWhitespace: true })

    info('hashFiles=' + hashFiles.join(','))

    const tasks = hashFiles.filter(s => fs.existsSync(s))
        .map(item => getFileHash256(item))

    const hash256 = await Promise.all(tasks).then(res => {
        return crypto.createHash('sha256')
            .update(res.join(' ') + '|cache')
            .digest('hex')
    })

    primaryKey = `${os}-${key}-${hash256}`
    restoreKeys = [
        `${os}-${key}-`,
    ]

    return {
        primaryKey,
        restoreKeys,
    }
}()