import { simpleParser } from 'mailparser';
import { load } from 'cheerio'

const definitions = [
    {
        platform: 'chaturbate',
        selectors: {
            channel: 'td[id*="onlinemessage"] a:nth-child(1)'
        },
        from: 'follownotify@bk.chaturbate.com',
        template: 'https://chaturbate.com/:channel'
    },
    { 
        platform: 'fansly',
        selectors: {
            channel: ($) => $("a[href*='/live/']").attr('href').toString().split('/').at(-1),
            displayName: 'div[class*="message-col"] div:nth-child(5)',
            userId: ($) => $("img[src*='/api/v1/account/']").attr('src').toString().split('/').at(-2),
            avatar: ($) => $("img[src*='/api/v1/account/']").attr('src').toString()
        },
        from: 'no-reply@fansly.com',
        template: 'https://fansly.com/:channel',
        regex: /https:\/\/fansly.com\/live\/([a-zA-Z0-9_]+)/
    }
]

function render(template, values) {
    // console.log(`values=${values}`)
    // console.log(values)
    return template.replace(/:([a-zA-Z0-9_]+)/g, (match, key) => {
        // Replace :channel with the corresponding property from the values object
        return values[key] || match;
    });
}


/**
 * checkEmail
 * 
 * Check an e-mail for go-live notification content.
 * 
 * { isMatch, url, platform, channel, displayName, date } 
 * 
 * @param   {String}        body                   raw mail body
 * @returns {Object}        result                 
 * @returns {Boolean}       result.isMatch         true if e-mail contains a go-live notification
 * @returns {String}        result.url             example: https://fansly.com/projektmelody
 * @returns {String}        result.platform        example: fansly
 * @returns {String}        result.channel         example: projektmelody
 * @returns {String}        result.displayName     example: ProjektMelody
 * @returns {String}        result.date            example: 2024-05-31T01:02:00.000Z
 * @returns {String|null}   result.userId          Varies by platform. Some platforms don't have the userId in the e-mail, so it's null.
 *                                                 fansly example: '555722198917066752'
 */
export async function checkEmail (body) {

    const mail = await simpleParser(body)
    if (!mail?.html) {
        console.log(`mail.html was not truthy. This means the e-mail was text-only mode. This also means the e-mail is not a go-live notification.`);
        return { isMatch: false }
    }

    let res = {}
    let def = definitions.find((def) => def.from === mail.from.value[0].address)
    if (!def) return { isMatch: false, channel: null, platform: null, url: null };
    res.isMatch = true

    // Step 0, get values from e-mail metadata
    res.platform = def.platform
    res.date = new Date(mail.date).toISOString()
    
    // Step 1, get values using CSS selectors
    const $ = load(mail.html)
    for (const s in def.selectors) {
        res[s] = (def.selectors[s] instanceof Object) ? def.selectors[s]($) : $(def.selectors[s]).text()
    }

    // console.log(`res.url=${res.url} res.userId=${res.userId}`)

    // Step 2, get values using regex & templates
    res.channel = (() => {
        if (res.channel) return res.channel;
        if (def.regex && res.url) return def.regex.exec(res.url).at(1);
    })()

    res.userId = res.userId || null
    res.avatar = res.avatar || null

    res.url = res.url || render(def.template, { channel: res.channel })


    return res
}