import {simpleParser} from 'mailparser';
import * as fs from 'fs';
import * as path from 'path';

fs.readFile(path.join('S:\\parse-mail\\9o5stq4nkd4miv0usn7d5s8pqcp6neije2mju081'), (err, data) => {
    if (err) {
        return console.error(err);
    }
    simpleParser(data)
        .then(parsedData => {
            const pricingInfo = getPricingInfo(parsedData.text)
            console.log(pricingInfo);
        })
        .catch(parseError => {
            console.error(parseError);
        });
})


/**
 * Returns an object with the pricing info for the day for OGE
 *
 * @param textFromEmail Input text from an OGE Email
 */
function getPricingInfo(textFromEmail: string) {
    const centsRegex = /([0-9]+) cents/
    const dateRegex = /([a-zA-Z]+, [0-9][0-9]\/[0-9][0-9]\/[0-9][0-9][0-9][0-9])/
    const timeRegex = /([0-9][0-9]:[0-9][0-9] [a-zA-Z][a-zA-Z] - [0-9][0-9]:[0-9][0-9] [a-zA-Z][a-zA-Z])/
    // Extract the cents per hour
    const centsPerHour = Number(centsRegex.exec(textFromEmail)[1])

    // The date is in the format 'Wednesday, 08/22/2018'
    const date = dateRegex.exec(textFromEmail)[1]

    // The time is in the format '02:00 PM - 07:00 PM'
    // we want to break this down into the start and end time
    const timeRange = timeRegex.exec(textFromEmail)[1]
    const startAndEndTimes = timeRange.split(' - ');
    const [startTime, endTime] = startAndEndTimes;

    // Create actual date objects for the start and end time, so we can use them programmatically
    const startTimeAndDate = new Date(`${date}, ${startTime}`)
    const endTimeAndDate = new Date(`${date}, ${endTime}`)

    return {
        centsPerHour,
        startTimeAndDate,
        endTimeAndDate
    }
}