Hitomi Webtoon Reader

Converts gallery preview into webtoon-style vertical scroll using Hitomi's own URL functions.
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// ==UserScript==
// @name         Hitomi Webtoon Reader
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Converts gallery preview into webtoon-style vertical scroll using Hitomi's own URL functions.
// @match        *://hitomi.la/*
// @grant        none
// @run-at       document-idle
// @license MIT
// ==/UserScript==

(function() {
    'use strict';

    // Only run on gallery pages
    const match = window.location.pathname.match(/-?([0-9]+)(?:\.html)?$/);
    if (!match || !match[1]) return;
    const galleryid = parseInt(match[1]);

    let done = false;

    const timer = setInterval(() => {
        if (done) return;

        // Wait for Hitomi's own functions AND gallery data to be ready
        if (typeof galleryinfo === 'undefined' || !galleryinfo) return;
        if (typeof url_from_url_from_hash !== 'function') return;
        if (typeof gg === 'undefined' || typeof gg.m !== 'function') return;

        const files = galleryinfo.files;
        if (!files || files.length === 0) return;

        done = true;
        clearInterval(timer);

        // Build webtoon container
        const webtoonBox = document.createElement('div');
        webtoonBox.id = 'webtoon-reader';
        webtoonBox.style.cssText = 'display:flex;flex-direction:column;width:100%;background:#111;margin:0 auto;padding:0;';

        files.forEach((image) => {
            const newImg = document.createElement('img');

            // Use Hitomi's own function to generate the correct full-res URL
            // This is exactly what the reader page does internally
            let src;
            try {
                if (image.hasavif) {
                    src = url_from_url_from_hash(galleryid, image, 'avif', 'avif');
                } else if (image.haswebp) {
                    src = url_from_url_from_hash(galleryid, image, 'webp', 'webp');
                } else {
                    const ext = image.name.split('.').pop();
                    src = url_from_url_from_hash(galleryid, image, 'images', ext);
                }
            } catch(e) {
                // Fallback: try without format preference
                try {
                    const ext = image.name.split('.').pop();
                    src = url_from_url_from_hash(galleryid, image, 'images', ext);
                } catch(e2) {
                    console.error('Failed to generate URL for', image.name, e2);
                    return;
                }
            }

            if (!src) return;

            newImg.src = src;
            newImg.loading = 'lazy';
            newImg.style.cssText = 'width:100%;max-width:100vw;height:auto;display:block;margin:0 auto;border:none;min-height:300px;background:#222;';
            newImg.onload = function() { this.style.minHeight = 'auto'; };

            webtoonBox.appendChild(newImg);
        });

        // Hide original thumbnail area and pagination
        const previewContainer = document.querySelector('.gallery-preview');
        if (previewContainer) {
            previewContainer.classList.remove('lillie');
            // Hide old thumbnails
            const thumbList = previewContainer.querySelector('.thumbnail-list');
            if (thumbList) thumbList.style.display = 'none';
            const pagerNav = previewContainer.querySelector('.simplePagerNav');
            if (pagerNav) pagerNav.style.display = 'none';
            // Insert webtoon reader
            previewContainer.appendChild(webtoonBox);
            previewContainer.style.padding = '0';
        }

        // Also hide related galleries section to keep focus on reading
        document.querySelectorAll('.simplePagerNav').forEach(el => el.style.display = 'none');

    }, 300);
})();