const tag_version = '1.0.0';
let scriptURL;
if (document.currentScript) {
    // Works in modern browsers
    scriptURL = document.currentScript.src;
} else {
    // Fallback for older browsers
    var scripts = document.getElementsByTagName('script');
    var currentScript = scripts[scripts.length - 1];
    scriptURL = currentScript.src;
}

let urlObj = new URL(scriptURL);
let tagBaseUrl = urlObj.origin
let errUrl = tagBaseUrl + '/api/errors'

function uuidv4() {
    return "10000000-1000-4000-8000-100000000000".replace(/[018]/g, c => (
        c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4
    ).toString(16));
}

function sync_uuid(value, uuid, replace_string = '%%UUID%%') {
    value = String(value); 
    if (value.includes(replace_string)) {
        value = value.replace(replace_string, uuid);
    }
    return value;
}

function loadTags() {
    let tags = [{'html_tag': 'script', 'attributes': [{'key': 'async', 'value': ''}, {'key': 'src', 'value': 'https://tag.prospectdesk.ai/ldc.js?pid=gnatbpbqr~5647&aid=0eb9034a'}], 'content': ''}, {'html_tag': 'script', 'attributes': [], 'content': "window.ldcDataLayer = window.ldcDataLayer || []; function ldcConfig(){{ldcDataLayer.push(arguments);}}; ldcConfig('externalId', '%%UUID%%');"}];
    let uuid = Date.UTC().toString();

    try {
        uuid = uuidv4();
    } catch (e) {
        console.error(e)
    }

    if (typeof tags === "string") {
        tags = JSON.parse(tags);
    }

    tags.forEach(tag => {
        let container_tag = document.createElement(tag.html_tag);
        tag.attributes.forEach(attribute => {
            attribute.value = sync_uuid(attribute.value, uuid);
            container_tag.setAttribute(attribute.key, attribute.value);
        });

        if (tag.content) {
            tag.content = sync_uuid(tag.content, uuid);
            container_tag.innerHTML = tag.content;
        }

        container_tag.onerror = function(event) {
            fetch(errUrl, {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify({
                    message: `tags service ${tag_version}: an error occured`,
                    tag_html: container_tag.outerHTML,
                    timestamp: Date.now(),
                    error_event: event,
                    script_url: scriptURL
                })
            }).then(response => {
                console.log(`tags service ${tag_version}: error reported to server: ${response.status}`);
            }).catch(error => {
                console.error(error);
            });
        }

        document.body.appendChild(container_tag);
    })

    console.log(`tags service ${tag_version}: loaded!`)  
}

if (document.readyState === "loading") {
    window.addEventListener('DOMContentLoaded', loadTags);
} else {
    loadTags();
}