// ==UserScript==
// @name             Twitter Enlarge the image in the media section
// @name:ja          Twitter メディア欄で画像を拡大するやつ
// @namespace        http://tampermonkey.net/
// @version          1.01
// @description      Enlarge the image in the media section to view the entire image
// @description:ja  メディア欄の画像を拡大して全体表示します。
// @author           Nogaccho
// @match            https://twitter.com/*
// @grant            none
// @license          MIT
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    let previewDiv = null;
    let lastHoveredImage = null;

    function createPreviewDiv() {
        if (previewDiv === null) {
            previewDiv = document.createElement('div');
            document.body.appendChild(previewDiv);
            previewDiv.style.position = 'fixed';
            previewDiv.style.zIndex = '1000';
            previewDiv.style.pointerEvents = 'none';
            previewDiv.style.display = 'none';
            previewDiv.style.top = '50%';
            previewDiv.style.left = '50%';
            previewDiv.style.transform = 'translate(-50%, -50%)';
        }
    }

    function addEventListeners() {
        document.addEventListener('mouseover', onMouseOver);
        document.addEventListener('mouseout', onMouseOut);
    }

    function removeEventListeners() {
        document.removeEventListener('mouseover', onMouseOver);
        document.removeEventListener('mouseout', onMouseOut);
    }

function onMouseOver(event) {
    const target = event.target;
    if (target.tagName === 'IMG' && target.src && target.src.includes('twimg.com')) {
        // 画像URLを修正して高解像度のバージョンを取得
        const highResImageUrl = target.src.split('?')[0] + '?format=jpg&name=medium';
        const img = new Image();
        img.onload = function() {
            const aspectRatio = img.width / img.height;
            if (aspectRatio < 2.5 || aspectRatio > 3.5) {
                if (lastHoveredImage !== target) {
                    lastHoveredImage = target;
                    const previewImg = document.createElement('img');
                    previewImg.src = highResImageUrl; // 高解像度の画像URLを使用
                    previewImg.style.maxWidth = 'calc(100vw - 500px)';
                    previewImg.style.maxHeight = 'calc(100vh - 50px)';
                    previewImg.style.objectFit = 'contain';

                    previewDiv.innerHTML = '';
                    previewDiv.appendChild(previewImg);
                    previewDiv.style.display = 'block';
                }
            }
        };
        img.src = highResImageUrl;
    }
}


    function onMouseOut(event) {
        if (!event.relatedTarget || event.relatedTarget.tagName !== 'IMG') {
            previewDiv.style.display = 'none';
            lastHoveredImage = null;
        }
    }

    const observer = new MutationObserver((mutations, obs) => {
        if (window.location.href.includes('/media')) {
            createPreviewDiv();
            addEventListeners();
        } else {
            removeEventListeners();
            if (previewDiv) {
                previewDiv.style.display = 'none';
            }
        }
    });

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

})();