// ==UserScript==
// @name         简易拖拽
// @namespace    f+drag
// @version      2024.03.26
// @icon         data:image/png;base64,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
// @description  拖动文字、图片、链接时新窗口打开（拖拽距离超过15px,时间在1.2秒内）
// @author       f+
// @match        *://*/*
// @grant        none
// ==/UserScript==

(function () {
    "use strict";

    const requiredDistance = 15;
    let startY;
    let startX;

    const upperTimeLimit = 1200;
    let startTime;

    let link;
    let image;
    let text;

    // 重置状态
    function reset() {
        startY = void 0;
        startX = void 0;
        startTime = void 0;
        link = void 0;
        image = void 0;
        text = void 0;
    }
    // 记录拖拽起始
    function setStart(event) {
        startY = event.clientY;
        startX = event.clientX;
        startTime = new Date();
    }
    // 判断是否是图片链接
    function isImageLink(link) {
        if (!link || !link.href) {
            return false;
        }
        const imageExtensions = [".jpg", ".jpeg", ".png", ".gif", ".bmp", ".webp"];
        const lowerHref = link.href.toLowerCase();
        return imageExtensions.some((ext) => lowerHref.endsWith(ext));
    }

    // 监听拖放开始事件
    document.addEventListener("dragstart", function (event) {
        // 获取拖动的链接元素
        if ("closest" in event.target) {
            link = event.target.closest("a");
            image = event.target.closest("img");
            if (link || image) {
                // 记录初始位置
                setStart(event);
            }
        } else {
            const selection = window.getSelection();
            if (selection) {
                // 判断选中的文本anchorNode跟拖动srcElement的关系
                if (selection.anchorNode === event.target) {
                    text = selection.toString().trim();
                    setStart(event);
                }
            }
        }
    });

    // 监听拖放结束事件
    document.addEventListener("dragend", function (event) {
        function isGoodDrag() {
            const distanceY = Math.abs(event.clientY - startY);
            const distanceX = Math.abs(event.clientX - startX);
            const isDragged = distanceY > requiredDistance && distanceX * 4 < distanceY;
            const isIntime = new Date() - startTime < upperTimeLimit;
            return isDragged && isIntime;
        }

        if (isGoodDrag()) {
            if (link || image || text) {
                // 获取链接的 URL
                let url;
                if (text) {
                    // 文本拥有最高优先级
                    if (text.startsWith("http://") || text.startsWith("https://")) {
                        url = text;
                    } else {
                        url = `https://cn.bing.com/search?q=${encodeURIComponent(text)}&FORM=PORE`;
                    }
                } else if (isImageLink(link)) {
                    // 其次是如果link是图片则为该link
                    url = link.href;
                } else if (image && image.src) {
                    // 再次是image
                    url = image.src;
                } else if (link && link.href) {
                    // 最后是其他link
                    url = link.href;
                }

                if (url) {
                    console.log("超级拖拽");
                    // 阻止默认的拖放行为
                    if (event.cancelable) event.preventDefault();
                    event.stopImmediatePropagation();
                    // 在后台打开链接
                    window.open(url, "_blank");
                }
            }
        }
        // 重置状态
        reset();
    });
})();