document.addEventListener("DOMContentLoaded", function() {

    console.log('gtranslate_abbr.js: DOMContentLoaded event fired. Script starting...');

    // GTranslate 위젯이 완전히 로드되고 DOM에 렌더링될 때까지 충분히 기다립니다.
    // 기존 2000ms에서 500ms로 단축하여 언어 약자 변경을 가속화합니다.
    setTimeout(function() {
        console.log('gtranslate_abbr.js: setTimeout callback executed. Attempting to modify language text...');

        const gtSelectedLink = document.querySelector('.gt_switcher_wrapper .gt_selected a');
        if (gtSelectedLink) {
            let targetNodeForCurrentLang = null;
            for (const node of gtSelectedLink.childNodes) {
                if (node.nodeType === Node.TEXT_NODE && node.textContent.trim().length > 0) {
                    targetNodeForCurrentLang = node;
                    break;
                }
                if (node.nodeType === Node.ELEMENT_NODE && node.tagName === 'SPAN' && !node.hasAttribute('style')) {
                    targetNodeForCurrentLang = node;
                    break;
                }
            }
            
            if (targetNodeForCurrentLang) {
                console.log('gtranslate_abbr.js: Found current language display element. Content before change:', targetNodeForCurrentLang.textContent.trim());
                replaceLanguageText(targetNodeForCurrentLang);
            } else {
                console.warn('gtranslate_abbr.js: Current language display text node/span not found. Check GTranslate DOM structure or increase timeout.');
            }
        } else {
            console.warn('gtranslate_abbr.js: .gt_selected a element not found for current language display.');
        }

        let menuItems = document.querySelectorAll('.gt_switcher_wrapper .gt_option a');
        if (menuItems.length > 0) {
            menuItems.forEach(function(item) {
                let targetNodeForMenuItem = null;
                for (const node of item.childNodes) {
                    if (node.nodeType === Node.TEXT_NODE && node.textContent.trim().length > 0) {
                        targetNodeForMenuItem = node;
                        break;
                    }
                    if (node.nodeType === Node.ELEMENT_NODE && node.tagName === 'SPAN' && !node.hasAttribute('style')) {
                        targetNodeForMenuItem = node;
                        break;
                    }
                }

                if (targetNodeForMenuItem) {
                    console.log(`gtranslate_abbr.js: Found dropdown item text node/span. Content before change: "${targetNodeForMenuItem.textContent.trim()}"`);
                    replaceLanguageText(targetNodeForMenuItem);
                } else {
                    console.warn(`gtranslate_abbr.js: Dropdown item text node/span not found for item: "${item.outerHTML}".`);
                }
            });
            console.log('gtranslate_abbr.js: Modified dropdown menu items. Count:', menuItems.length);
        } else {
            console.warn('gtranslate_abbr.js: Dropdown menu items not found after timeout. Consider increasing timeout duration or checking selectors.');
        }

        const targetNode = document.querySelector('.gt_switcher_wrapper');
        if (targetNode) {
            console.log('gtranslate_abbr.js: Starting MutationObserver on .gt_switcher_wrapper');
            const observer = new MutationObserver(function(mutations) {
                mutations.forEach(function(mutation) {
                    const currentLangLinkObserved = document.querySelector('.gt_switcher_wrapper .gt_selected a');
                    if (currentLangLinkObserved) {
                        let targetNodeForCurrentLangObserved = null;
                        for (const node of currentLangLinkObserved.childNodes) {
                            if (node.nodeType === Node.TEXT_NODE && node.textContent.trim().length > 0) {
                                targetNodeForCurrentLangObserved = node;
                                break;
                            }
                            if (node.nodeType === Node.ELEMENT_NODE && node.tagName === 'SPAN' && !node.hasAttribute('style')) {
                                targetNodeForCurrentLangObserved = node;
                                break;
                            }
                        }
                        if (targetNodeForCurrentLangObserved && targetNodeForCurrentLangObserved.textContent.trim().length > 3) {
                                replaceLanguageText(targetNodeForCurrentLangObserved);
                        }
                    }

                    document.querySelectorAll('.gt_switcher_wrapper .gt_option a').forEach(function(item) {
                        let targetNodeForMenuItemObserved = null;
                        for (const node of item.childNodes) {
                            if (node.nodeType === Node.TEXT_NODE && node.textContent.trim().length > 0) {
                                targetNodeForMenuItemObserved = node;
                                break;
                            }
                            if (node.nodeType === Node.ELEMENT_NODE && node.tagName === 'SPAN' && !node.hasAttribute('style')) {
                                targetNodeForMenuItemObserved = node;
                                break;
                            }
                        }
                        if (targetNodeForMenuItemObserved && targetNodeForMenuItemObserved.textContent.trim().length > 3) {
                            replaceLanguageText(targetNodeForMenuItemObserved);
                        }
                    });
                });
            });

            observer.observe(targetNode, { childList: true, subtree: true, characterData: true, attributes: true });
            console.log('gtranslate_abbr.js: MutationObserver successfully initialized.');
        } else {
            console.warn('gtranslate_abbr.js: Target node for MutationObserver (.gt_switcher_wrapper) not found. MutationObserver will not run.');
        }
    }, 80); // 여기서 지연 시간을 500ms로 줄였습니다.

    function replaceLanguageText(element) {
        let originalText = element.textContent.trim();
        let newText = originalText;

        switch (originalText) {
            case 'Korean':
                newText = 'KR';
                break;
            case 'English':
                newText = 'EN';
                break;
            case 'Chinese (Simplified)':
                newText = 'CN';
                break;
            case 'Russian':
                newText = 'RU';
                break;
            case 'Japanese':
                newText = 'JP';
                break;
            case 'Thai':
                newText = 'TH';
                break;
            case 'Vietnamese':
                newText = 'VN';
                break;
			case 'Indonesian':
                newText = 'ID';
                break;
			case 'Mongolian':
                newText = 'MN';
                break;
        }
        
        if (newText !== originalText) {
            element.textContent = newText;
            console.log(`gtranslate_abbr.js: Changed "${originalText}" to "${newText}".`);
        }
    }
});