YTTranscriptVers1

var captions = function getCaptions(period) {
    return new Promise((resolve, reject) => {
        var maxTime = 3000;
        var addTime = 0;
        var inputLanguage = 'russian';
        var searchedLanguage = inputLanguage ? inputLanguage : 'english';
        var options = '';

        var el = document.evaluate(".//*[@aria-label='More actions']", document, null, 9, null).singleNodeValue;

        try {

            var scroll = setInterval(function () {
                if (addTime >= maxTime) {
                    clearInterval(scroll);
                    resolve(el);
                }
                el = document.evaluate(".//*[@aria-label='More actions']", document, null, 9, null).singleNodeValue;

                if (el) {
                    addTime = 0;
                    clearInterval(scroll);
                    el.click()

                    var elOpenTranscript = document.evaluate(".//*[text()='Open transcript']", document, null, 9, null).singleNodeValue;
                    if (elOpenTranscript) {

                        elOpenTranscript.click();
                        console.log('Transcript available')

                        var elTranscriptDropDown = document.evaluate(".//ytd-transcript-footer-renderer//paper-button", document, null, 9, null).singleNodeValue;

                        if (elTranscriptDropDown) {
                            elTranscriptDropDown.click();
                            var elTranscriptOptions = document.evaluate(".//div[@id='secondary']//paper-listbox[@id='menu']/a[//paper-item-body/div[text()]]", document, null, 7, null);
                            console.log('snapshot length: ' + elTranscriptOptions.snapshotLength);

                            var languages = [];
                            for (let i = 0; i < elTranscriptOptions.snapshotLength; i++) {
                                const element = elTranscriptOptions.snapshotItem(i);
                                var currLanguage = element.textContent.trim();
                                languages.push(currLanguage);

                            }
                            console.log(languages)
                            var filtered = languages.filter(l => l.toLowerCase().includes(searchedLanguage));

                            if (filtered.length === 0) {
                                filtered = languages.filter(l => l.toLowerCase().includes('english'));
                                console.log(filtered);
                                if (filtered.length > 0) {
                                    options = {
                                        language: 'default',
                                        languages: elTranscriptOptions
                                    }
                                    console.log(`Searched language (${searchedLanguage}) captions not found. Default (English) available.`)
                                    resolve(options)
                                } else {
                                    resolve('No captions for searched or default language!')

                                }
                            } else {
                                options = {
                                    language: 'input',
                                    languages: elTranscriptOptions
                                }
                                resolve(options)
                            }
                            resolve(elTranscriptOptions)

                        } else {
                            console.log('Transcript dropdown menu cannot be open')
                        }

                        resolve(elOpenTranscript);

                    } else {
                        clearInterval(scroll);
                        console.log('Open Transcript not available')
                        resolve('Transcript not available.');
                    }
                } else {
                    addTime += 1000;
                    console.log('adding 1000 ms')
                }
            }, period)
        } catch (error) {
            console.log(error)
        }

    })
}

function saveCaptions(captionsObj) {
    var subs = '';
    if (typeof captionsObj === "string") {
        console.log('CAPTIONS NOT AVAILABLE')
        return;
    } else {
        var inputLanguage = 'russian';
        var searchedLanguage = inputLanguage ? inputLanguage : 'english';
        const language = captionsObj.language;
        var captions = captionsObj.languages;
        subs = [];
        console.log(captions.snapshotLength)

        if (captions.snapshotLength > 0) {
            for (let i = 0; i < captions.snapshotLength; i++) {

                const element = captions.snapshotItem(i);
                console.log(element)

                var currLanguage = element.textContent.trim();
                console.log(currLanguage)

                if ((currLanguage.toLowerCase().includes(searchedLanguage) && language === 'input') || (currLanguage.toLowerCase().includes('english') && language === 'default')) {
                    element.click();
                    setTimeout(() => {
                        var elSubs = document.evaluate(".//div[@id='secondary']//div[@id='content']//div[contains(@class, 'cue-group')]/div", document, null, 7, null);

                        if (elSubs.snapshotLength > 0) {
                            for (let j = 0; j < elSubs.snapshotLength; j++) {
                                const row = elSubs.snapshotItem(j);
                                subs.push(row.textContent.trim().replace(/\n/, ' '))
                                //console.log(row.textContent.trim());
                            }
                        }
                        console.log(subs)

                    }, 500)
                    break;


                } else {
                    'No captions for searched language or English(default)!'
                }
            }
        } else {
            console.log('Cannot find subs rows!')
        }
    }

}

captions(1000)
    .then(res => saveCaptions(res))
    .catch(er => console.log(er))