// Dummy list of offer keys
const availableOffers = [
    '26DDA5B1-EAE5-4C18-8886-2285FD1CA3AE',
    '4C7BBB85-A6B6-48E1-9ED0-E5675446AB1C',
    'D677E31B-A597-4AF6-B2AD-CE66715BABDC',
    '613579A3-2B5A-4FB0-93BF-287848CB190F',
    '5C5D3250-354A-4A04-BE2A-2516A13B361D'
]

// Dummy list of offer details (key/value pair)
const offerDetails = {
    '26DDA5B1-EAE5-4C18-8886-2285FD1CA3AE': 'This is a good offer',
    '4C7BBB85-A6B6-48E1-9ED0-E5675446AB1C': 'This is a better offer',
    'D677E31B-A597-4AF6-B2AD-CE66715BABDC': 'This is an extremely lucrative offer',
    '613579A3-2B5A-4FB0-93BF-287848CB190F': 'This offer will know your socks off',
    '5C5D3250-354A-4A04-BE2A-2516A13B361D': 'This offer is a once in a lifetime oppertuntiy'
}

function getList() {
    /**
     * Wait for 5 seconds
     * Then return the availableOffers list
     * (Using setTimeout to fake slow ajax request)
     */

    return new Promise((resolve, reject) => {

        // Wait 5 seconds, then return stuff
        setTimeout(wait => {
            resolve(availableOffers)  // Returns available offers
        }, 2000)

    })
}

function getItem(id) {
    /**
     * Wait for 2 seconds
     * Then return a key/value pair from the offerDetails list
     * (Using setTimeout to fake slow ajax request)
     */

    return new Promise((resolve, reject) => {

        // Wait 2 seconds, then return stuff
        setTimeout(wait => {
            return resolve(offerDetails[id])  // Returns offer by ID
        }, 2000)
    })

}


async function pretendThatItsSync() {
    /**
     * Async function
     * It almost looks like sync code
     * Using the await statement, we can wait for our dependencies to resolve
     * BUT waiting does not mean blocking - our application is still async
     *
     * We will perform 2 fake REST/Ajax calls and push the results to a list
     * At the end we will print out the list
     */

    // The endresult is life!
    const endresult = []

    // Wait for for the function to return the list
    const offers = await getList()

    // Iterate over the offers list
    for (let offer of offers) {

        // Wait for each function to return the details
        let item = await getItem(offer)

        // Then push the result
        endresult.push(item)
    }

    // Finally print out the endresult list
    // It's complete and not just partially populated!
    console.log(endresult)

}

// See it in action
pretendThatItsSync()