// ==UserScript==
// @name         Hitomi.la Language Filter
// @namespace    https://git.ponywave.de/Akamaru/Userscripts
// @version      1.1
// @description  Filter manga by language on hitomi.la
// @author       Akamaru
// @match        https://hitomi.la/*
// @icon         https://www.google.com/s2/favicons?domain=hitomi.la&sz=32
// @grant        GM_getValue
// @grant        GM_setValue
// @grant        GM_registerMenuCommand
// @updateURL    https://git.ponywave.de/Akamaru/Userscripts/raw/branch/master/hitomi-language-filter.user.js
// @downloadURL  https://git.ponywave.de/Akamaru/Userscripts/raw/branch/master/hitomi-language-filter.user.js
// @run-at       document-idle
// ==/UserScript==

(function() {
    'use strict';

    // Available languages
    const languages = {
        'all': 'All Languages',
        'english': 'English',
        'japanese': 'Japanese',
        'chinese': 'Chinese',
        'korean': 'Korean',
        'spanish': 'Spanish',
        'french': 'French',
        'german': 'German',
        'russian': 'Russian',
        'italian': 'Italian',
        'portuguese': 'Portuguese',
        'thai': 'Thai',
        'vietnamese': 'Vietnamese',
        'polish': 'Polish',
        'indonesian': 'Indonesian',
        'turkish': 'Turkish'
    };

    // Get saved language preference (default: english)
    let selectedLanguage = GM_getValue('selectedLanguage', 'english');

    // Create language selector UI
    function createLanguageSelector() {
        const container = document.createElement('div');
        container.id = 'language-filter-container';
        container.style.cssText = `
            position: fixed;
            top: 10px;
            right: 10px;
            z-index: 10000;
            background: #fff;
            border: 2px solid #333;
            border-radius: 5px;
            padding: 10px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.3);
        `;

        const label = document.createElement('label');
        label.textContent = 'Language: ';
        label.style.fontWeight = 'bold';

        const select = document.createElement('select');
        select.style.cssText = `
            padding: 5px;
            border: 1px solid #ccc;
            border-radius: 3px;
            margin-left: 5px;
        `;

        // Add options
        for (const [code, name] of Object.entries(languages)) {
            const option = document.createElement('option');
            option.value = code;
            option.textContent = name;
            if (code === selectedLanguage) {
                option.selected = true;
            }
            select.appendChild(option);
        }

        // Handle language change
        select.addEventListener('change', function() {
            selectedLanguage = this.value;
            GM_setValue('selectedLanguage', selectedLanguage);
            filterGalleries();
        });

        container.appendChild(label);
        container.appendChild(select);
        document.body.appendChild(container);
    }

    // Filter galleries based on selected language
    function filterGalleries() {
        // Find all gallery items (both classes used on the site)
        const galleries = document.querySelectorAll('.gallery, .dj, .manga');

        galleries.forEach(gallery => {
            if (selectedLanguage === 'all') {
                gallery.style.display = '';
                return;
            }

            // Check for language link in format /index-LANGUAGE.html
            const languageTag = gallery.querySelector('a[href*="/index-"][href$=".html"]');
            if (!languageTag) {
                gallery.style.display = 'none';
                return;
            }

            const href = languageTag.getAttribute('href');
            const langMatch = href.match(/\/index-([^.]+)\.html/);

            if (langMatch && langMatch[1]) {
                const galleryLang = langMatch[1].toLowerCase();
                if (galleryLang === selectedLanguage) {
                    gallery.style.display = '';
                } else {
                    gallery.style.display = 'none';
                }
            } else {
                gallery.style.display = 'none';
            }
        });
    }

    // Register menu command for quick access
    GM_registerMenuCommand('Change Language Filter', function() {
        const newLang = prompt('Enter language code:\n' +
            Object.entries(languages).map(([code, name]) => `${code} - ${name}`).join('\n'));
        if (newLang && languages[newLang]) {
            selectedLanguage = newLang;
            GM_setValue('selectedLanguage', selectedLanguage);
            location.reload();
        }
    });

    // Initialize
    function init() {
        createLanguageSelector();
        filterGalleries();

        // Watch for dynamic content loading
        const observer = new MutationObserver(function(mutations) {
            filterGalleries();
        });

        observer.observe(document.body, {
            childList: true,
            subtree: true
        });
    }

    // Wait for page to load
    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', init);
    } else {
        init();
    }
})();