// ==UserScript==
// @name         禁止 Web 延迟加载图片（一次性加载）
// @name:en      Disable web lazy loading images (one-time loading)
// @description  在 Web 页面中直接显示图片，禁止延迟加载，一次性加载所有图片
// @description:en Display images directly on the web page, disable lazy loading, load all images at once.
// @version      0.8.2
// @author       DUN
// @match        *://*/*
// @grant        none
// @run-at       document-start
// @namespace    https://greasyfork.org/users/662094
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    function isExcluded(url) {
        const excludedKeywords = [
        ];
        return excludedKeywords.some(keyword => url.includes(keyword));
    }

    function getAbsoluteImageUrl(relativeOrAbsoluteUrl) {
        if (relativeOrAbsoluteUrl.startsWith('http') || relativeOrAbsoluteUrl.startsWith('//')) {
            return relativeOrAbsoluteUrl.startsWith('//') ? window.location.protocol + relativeOrAbsoluteUrl : relativeOrAbsoluteUrl;
        } else {
            const a = document.createElement('a');
            a.href = relativeOrAbsoluteUrl;
            return a.href;
        }
    }

    function processSrcset(srcsetAttribute) {
        return srcsetAttribute.split(',').map(srcsetPart => {
            let [url, descriptor] = srcsetPart.trim().split(/\s+/);
            url = getAbsoluteImageUrl(url);
            return isExcluded(url) ? '' : `${url} ${descriptor}`;
        }).filter(part => part).join(', ');
    }

    function updateImageSource(imgElement) {
        const srcAttribute = imgElement.getAttribute("data-src") || imgElement.getAttribute("data-original");
        const srcsetAttribute = imgElement.getAttribute("data-srcset");

        if (srcAttribute && !isExcluded(srcAttribute)) {
            imgElement.src = getAbsoluteImageUrl(srcAttribute);
        }

        if (srcsetAttribute) {
            const processedSrcset = processSrcset(srcsetAttribute);
            if (processedSrcset) {
                imgElement.srcset = processedSrcset;
            }
        }

        imgElement.removeAttribute('data-src');
        imgElement.removeAttribute('data-srcset');
        imgElement.removeAttribute('srcset');
        imgElement.removeAttribute('sizes');
        imgElement.classList.remove('lazyload', 'lazy');
    }

    const observer = new MutationObserver(mutations => {
        mutations.forEach(mutation => {
            if (mutation.type === 'attributes' && (mutation.attributeName === 'data-src' || mutation.attributeName === 'data-srcset')) {
                updateImageSource(mutation.target);
            } else if (mutation.type === 'childList' && mutation.addedNodes.length) {
                mutation.addedNodes.forEach(node => {
                    if (node.tagName === 'IMG') {
                        updateImageSource(node);
                    } else if (node.querySelectorAll) {
                        node.querySelectorAll('img').forEach(updateImageSource);
                    }
                });
            }
        });
    });

    observer.observe(document.documentElement, {
        childList: true,
        subtree: true,
        attributes: true,
        attributeFilter: ['data-src', 'data-srcset']
    });

    window.addEventListener('DOMContentLoaded', () => {
        document.querySelectorAll('img').forEach(updateImageSource);
    });
})();