// localization = {} -- the dict with translations is created by the backend

ignore_ids_for_localization={
    setting_sd_hypernetwork: 'OPTION',
    setting_sd_model_checkpoint: 'OPTION',
    setting_realesrgan_enabled_models: 'OPTION',
    modelmerger_primary_model_name: 'OPTION',
    modelmerger_secondary_model_name: 'OPTION',
    modelmerger_tertiary_model_name: 'OPTION',
    train_embedding: 'OPTION',
    train_hypernetwork: 'OPTION',
    txt2img_styles: 'OPTION',
    img2img_styles: 'OPTION',
    setting_random_artist_categories: 'SPAN',
    setting_face_restoration_model: 'SPAN',
    setting_realesrgan_enabled_models: 'SPAN',
    extras_upscaler_1: 'SPAN',
    extras_upscaler_2: 'SPAN',
}

re_num = /^[\.\d]+$/
re_emoji = /[\p{Extended_Pictographic}\u{1F3FB}-\u{1F3FF}\u{1F9B0}-\u{1F9B3}]/u

original_lines = {}
translated_lines = {}

function hasLocalization() {
    return window.localization && Object.keys(window.localization).length > 0;
}

function textNodesUnder(el){
    var n, a=[], walk=document.createTreeWalker(el,NodeFilter.SHOW_TEXT,null,false);
    while(n=walk.nextNode()) a.push(n);
    return a;
}

function canBeTranslated(node, text){
    if(! text) return false;
    if(! node.parentElement) return false;

    var parentType = node.parentElement.nodeName
    if(parentType=='SCRIPT' || parentType=='STYLE' || parentType=='TEXTAREA') return false;

    if (parentType=='OPTION' || parentType=='SPAN'){
        var pnode = node
        for(var level=0; level<4; level++){
            pnode = pnode.parentElement
            if(! pnode) break;

            if(ignore_ids_for_localization[pnode.id] == parentType) return false;
        }
    }

    if(re_num.test(text)) return false;
    if(re_emoji.test(text)) return false;
    return true
}

function getTranslation(text){
    if(! text) return undefined

    if(translated_lines[text] === undefined){
        original_lines[text] = 1
    }

    tl = localization[text]
    if(tl !== undefined){
        translated_lines[tl] = 1
    }

    return tl
}

function processTextNode(node){
    var text = node.textContent.trim()

    if(! canBeTranslated(node, text)) return

    tl = getTranslation(text)
    if(tl !== undefined){
        node.textContent = tl
    }
}

function processNode(node){
    if(node.nodeType == 3){
        processTextNode(node)
        return
    }

    if(node.title){
        tl = getTranslation(node.title)
        if(tl !== undefined){
            node.title = tl
        }
    }

    if(node.placeholder){
        tl = getTranslation(node.placeholder)
        if(tl !== undefined){
            node.placeholder = tl
        }
    }

    textNodesUnder(node).forEach(function(node){
        processTextNode(node)
    })
}

function dumpTranslations(){
    if(!hasLocalization()) {
        // If we don't have any localization,
        // we will not have traversed the app to find
        // original_lines, so do that now.
        processNode(gradioApp());
    }
    var dumped = {}
    if (localization.rtl) {
        dumped.rtl = true;
    }

    for (const text in original_lines) {
        if(dumped[text] !== undefined) continue;
        dumped[text] = localization[text] || text;
    }

    return dumped;
}

function download_localization() {
    var text = JSON.stringify(dumpTranslations(), null, 4)

    var element = document.createElement('a');
    element.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
    element.setAttribute('download', "localization.json");
    element.style.display = 'none';
    document.body.appendChild(element);

    element.click();

    document.body.removeChild(element);
}

document.addEventListener("DOMContentLoaded", function () {
    if (!hasLocalization()) {
        return;
    }

    onUiUpdate(function (m) {
        m.forEach(function (mutation) {
            mutation.addedNodes.forEach(function (node) {
                processNode(node)
            })
        });
    })

    processNode(gradioApp())

    if (localization.rtl) {  // if the language is from right to left,
        (new MutationObserver((mutations, observer) => { // wait for the style to load
            mutations.forEach(mutation => {
                mutation.addedNodes.forEach(node => {
                    if (node.tagName === 'STYLE') {
                        observer.disconnect();

                        for (const x of node.sheet.rules) {  // find all rtl media rules
                            if (Array.from(x.media || []).includes('rtl')) {
                                x.media.appendMedium('all');  // enable them
                            }
                        }
                    }
                })
            });
        })).observe(gradioApp(), { childList: true });
    }
})