'use strict';
const axios = require('axios');
const https = require("https");
const SMTP_EMAIL_SENDER = process.env.SMTP_EMAIL_SENDER;

const HOSTNAME_URL = process.env.HOSTNAME_URL || "https://qmicloud.qliktech.com";
const FOOTER = `<div style="color:#404040;font-size:16px;margin:30px 0px">
            <p style="margin:0px">Check it out at <a href="${HOSTNAME_URL}">${HOSTNAME_URL}</a></p>
        </div>`;


async function _doSend(to, subject, htmlText) {
    try {
        var body = {
            "to": to,
            "subject": subject,
            "html": htmlText
        };
        await axios({
            url: SMTP_EMAIL_SENDER,
            method: "post",
            data: body,
            httpsAgent: new https.Agent({  
                rejectUnauthorized: false
            })
        });
        console.log('SendEmail (Qlik SMTP)# message sent to: ' + to);

    } catch (err) {
        // Handle Error Here
        console.log("SendEmail (Qlik SMTP) _doSend error: could not send the email to: " +to);
    }
}

function _getCommonDetails(provision, scenario){
    var description = decodeURI(scenario.description);
    var externalAccess = provision.isExternalAccess? 'Yes' : 'No';
    var schedule = "";
    if ( !provision.schedule || provision.schedule.is24x7 ) {
        schedule = "24x7";
    } else if ( provision.schedule && !provision.schedule.is24x7 ) {
        schedule = `from ${provision.schedule.localeStartupTime}h until ${provision.schedule.localeShutdownTime}h (${provision.schedule.localTimezone})`;
    }
    return `<div style="color:#404040;font-size:18px;margin:20px 0px">
            <p style="margin:0px">Provision information:</p>
        </div>
        <div>
            <span style="color:#404040">ID: </span> ${provision._id}
        </div>
        <div>
            <span style="color:#404040">VMs Running schedule: </span> ${schedule}
        </div>
        <div>
            <span style="color:#404040">Purpose: </span> ${provision.description}
        </div>
        <div>
            <span style="color:#404040">Scenario: </span> ${scenario.title}
        </div>
        <div>
            <span style="color:#404040">With external access: </span> ${externalAccess}
        </div>
        <div>
            <span style="color:#404040">Description: </span> ${description}
        </div>`;
}

function getHtmlScenarioDestroyIn24( provision, scenario, period, warningDays) {
    var common = _getCommonDetails(provision,scenario);
    return`<div style="width:600px;color:black!important;font-family:'Source Sans Pro',sans-serif;padding:50px">
    <div style="background-color:white;height:100%;padding:20px 10px">
        <div style="color:#404040;font-size:34px;text-align:center;margin:20px">
            <p style="margin:0px">QMI Cloud</p>
        </div>
        <div style="color:#404040;font-size:22px;margin:20px 0px 40px 0px">
            <p style="margin:0px">Provision '${scenario.title}' inactive more than ${period} days</p>
        </div>
        <div style="color:#404040;font-size:18px;margin:10px 0px">
            <p style="margin:0px;color: #FF2020">This scenario will be automatically DESTROYED in ${(warningDays*24)} hours.</p>
        </div>
        <div style="color:#404040;font-size:16px;margin:30px 0px">
            <p style="margin:0px">If you don't want this to happen, you've got ${(warningDays*24)} hours (from when this email was sent) as a grace period to get back at 'Running' status this provision.</p>
        </div>
        ${common}
        ${FOOTER}
    </div>
    </div>`;
}


function getHtmlScenarioVMsStopped( provision, scenario) {
    var common = _getCommonDetails(provision,scenario);
    return `<div style="width:600px;color:black!important;font-family:'Source Sans Pro',sans-serif;padding:50px">
    <div style="background-color:white;height:100%;padding:20px 10px">
        <div style="color:#404040;font-size:34px;text-align:center;margin:20px">
            <p style="margin:0px">QMI Cloud</p>
        </div>
        <div style="color:#404040;font-size:22px;margin:20px 0px 40px 0px">
            <p style="margin:0px">Provision '${scenario.title}'</p>
        </div>
        <div style="color:#404040;font-size:18px;margin:10px 0px">
            <p style="margin:0px;color: #FF2020">All VMs for this provision <b>stopped</b> automatically.</p>
        </div>
        <div style="color:#404040;font-size:16px;margin:30px 0px">
            <p style="margin:0px">You can start them up again from <a href="${HOSTNAME_URL}">${HOSTNAME_URL}</a></p>
        </div>
        ${common}
        ${FOOTER}
    </div>
    </div>`;
}

function getHtmlScenarioWillStopIn24( provision, scenario, period, warningDays ) {
    var common = _getCommonDetails(provision,scenario);
    return`<div style="width:600px;color:black!important;font-family:'Source Sans Pro',sans-serif;padding:50px">
    <div style="background-color:white;height:100%;padding:20px 10px">
        <div style="color:#404040;font-size:34px;text-align:center;margin:20px">
            <p style="margin:0px">QMI Cloud</p>
        </div>
        <div style="color:#404040;font-size:22px;margin:20px 0px 40px 0px">
            <p style="margin:0px">Provision '${scenario.title}' - VMs running for ${period} days</p>
        </div>
        <div style="color:#404040;font-size:18px;margin:10px 0px">
            <p style="margin:0px;color: #FF2020">This scenario will automatically stop its VMs in ${warningDays*24} hours.</p>
        </div>
        <div style="color:#404040;font-size:18px;margin:20px 0px 10px 0px">
            <p style="margin:0px;color: #FF2020">Take action and extend the period ${(period+warningDays)} extra days.</p>
        </div>
        <div style="color:#404040;font-size:16px;margin:30px 0px">
            <p style="margin:0px">If you don't want the VMs to automatically stop, you've got ${warningDays*24} hours (from when this email was sent) as a grace period to extend this scenario's <b style="color: #009845">Running</b> VMs for ${(period+warningDays)} extra days.</p>
        </div>
        ${common}
        ${FOOTER}
    </div>
    </div>`;
}
function getHtmlNewProvision(provision, scenario) {
    var htmlint;
    if ( provision && provision.outputs ) {
        htmlint = `<div style="color:#404040;font-size:18px;padding: 10px 0px;">Connection resources</div>`;
    } else {
        htmlint = "";
    }
    for (let key in provision.outputs) {
        htmlint += `<div>
            <span style="color:#404040">${key}</span> 
            <pre style="color:#404040;">${provision.outputs[key]}</pre>
        </div>`;
    }

    var common = _getCommonDetails(provision, scenario);

    return `<div style="width:600px;color:black!important;font-family:'Source Sans Pro',sans-serif;padding:50px">
    <div style="background-color:white;height:100%;padding:20px 10px">
        <div style="color:#404040;font-size:34px;text-align:center;margin:20px">
            <p style="margin:0px">QMI Cloud</p>
        </div>
        <div style="color:#404040;font-size:22px;margin:20px 0px">
            <p style="margin:0px">Scenario '${scenario.title}' successfully provisioned!</p>
        </div>

        ${common}
        
        <div style="margin: 30px 0px;">
        ${htmlint}
        </div>
        ${FOOTER}
        
    </div>
    </div>`;
}

function getHtmlErrorProvision(provision, scenario) {
    var common = _getCommonDetails(provision, scenario);
    return`<div style="width:600px;color:black!important;font-family:'Source Sans Pro',sans-serif;padding:50px">
    <div style="background-color:white;height:100%;padding:20px 10px">
        <div style="color:#404040;font-size:34px;text-align:center;margin:20px">
            <p style="margin:0px">QMI Cloud</p>
        </div>
        <div style="color:#404040;font-size:20px;margin:20px 0px">
            <p style="margin:0px;color: #FF2020">Oops! Something didn't work.</p>
        </div>
        <div style="color:#404040;font-size:20px;margin:20px 0px 50px 0px">
            <p style="margin:0px">Scenario '${scenario.title}' failed during provision.</p>
        </div>  
        <div style="color:#404040;font-size:16px;margin:30px 0px">
            <p style="margin:0px">Please, follow these steps:</p>
            <ul>
                <li>Reach out the person responsible for this scenario for support.</li>
                <li>As soon as it's possible, consider destroy this provision since it's taking valuable cloud resources which might imply relevant cost.</li>
            </ul>
        </div>
        ${common}
        ${FOOTER}
    </div>
    </div>`;
}

function getHtmlDestroyProvision(provision, scenario) {
    var common = _getCommonDetails(provision, scenario);
    return`<div style="width:600px;color:black!important;font-family:'Source Sans Pro',sans-serif;padding:50px">
    <div style="background-color:white;height:100%;padding:20px 10px">
        <div style="color:#404040;font-size:34px;text-align:center;margin:20px">
            <p style="margin:0px">QMI Cloud</p>
        </div>
        <div style="color:#404040;font-size:20px;margin:40px 0px">
            <p style="margin:0px">Scenario '${scenario.title}' successfully destroyed!</p>
        </div>
        ${common}
        ${FOOTER}
    </div>
    </div>`;
}


// async..await is not allowed in global scope, must use a wrapper
async function sendProvisionSuccess( provision, scenario ) {
    const htmlText = getHtmlNewProvision(provision, scenario);
    await _doSend(provision.user.upn, 'QMI Cloud - Provision finished successfully', htmlText);
}

async function sendProvisionError(provision, scenario ) {
    const htmlText = getHtmlErrorProvision(provision, scenario);
    await _doSend(provision.user.upn, 'QMI Cloud - Provision with errors', htmlText);
}

async function sendDestroyedSuccess(provision, scenario ) {

    const htmlText = getHtmlDestroyProvision(provision, scenario);
    await _doSend(provision.user.upn, 'QMI Cloud - Provision destroyed successfully', htmlText);
    
}

async function sendWillStopIn24( provision, scenario, period, warningDays ) {

    const htmlText = getHtmlScenarioWillStopIn24( provision, scenario, period, warningDays);
    await _doSend(provision.user.upn, `QMI Cloud - VMs will stop in ${warningDays*24} hours`, htmlText);

}

async function sendWillDestroyIn24( provision, scenario, period, warningDays ) {

    const htmlText = getHtmlScenarioDestroyIn24( provision, scenario, period, warningDays);
    await _doSend(provision.user.upn, `QMI Cloud - Provision will destroy in ${(warningDays*24)} hours`, htmlText);
}

async function sendVMsStopped( provision, scenario ) {
    const htmlText = getHtmlScenarioVMsStopped( provision, scenario);
    await _doSend(provision.user.upn, 'QMI Cloud - VMs stopped automatically', htmlText);
}

module.exports.sendProvisionSuccess = sendProvisionSuccess;
module.exports.sendProvisionError = sendProvisionError;
module.exports.sendDestroyedSuccess = sendDestroyedSuccess;
module.exports.sendWillStopIn24 = sendWillStopIn24;
module.exports.sendVMsStopped = sendVMsStopped;
module.exports.sendWillDestroyIn24 = sendWillDestroyIn24;
module.exports._doSend = _doSend;