// ==UserScript==
// @name         全局强制虚拟定位（双重 Hook + 微抖动 + 状态回显）
// @namespace    http://tampermonkey.net/
// @version      3.0.0
// @description  Hook getCurrentPosition + watchPosition，强制返回虚拟坐标；中国视图地图选点 + 状态栏回显 + 星号收藏夹
// @author       you
// @match        *://*/*
// @run-at       document-start
// @grant        GM_setValue
// @grant        GM_getValue
// @grant        GM_registerMenuCommand
// @grant        GM_getResourceText
// @grant        GM_addStyle
// @require      https://unpkg.com/leaflet@1.9.4/dist/leaflet.js
// @require      https://cdn.jsdelivr.net/npm/sweetalert2@11
// @resource     leafletCSS https://unpkg.com/leaflet@1.9.4/dist/leaflet.css
// ==/UserScript==

(function () {
'use strict';

// ============================================================
// 第 0 部分：常量 & 存储
// ============================================================
var DEF_LAT = 35.0, DEF_LNG = 105.0;           // 默认中国中心
var ACC_BASE = 8;                                // 精度基准值（米）

function getFakeLat() { return GM_getValue('vg_lat', null); }
function getFakeLng() { return GM_getValue('vg_lng', null); }
function getFakeTs() { return GM_getValue('vg_ts', 0); }
var favs = GM_getValue('vg_favs', []);

function isVirtual() { return getFakeLat() !== null && getFakeLng() !== null; }

// ============================================================
// === 微抖动算法（Anti-Fingerprinting，严格按指定公式） ===
// ============================================================
function applyJitter(baseLat, baseLng) {
    var METER_TO_DEG = 1 / 111000;                     // 1 米 ≈ 0.000009009 度
    var MAX_JITTER = 0.2 * METER_TO_DEG;               // 半径 0.2 米（手持 GPS 漂移）
    var jitteredLat = baseLat + (Math.random() - 0.5) * 2 * MAX_JITTER;
    var jitteredLng = baseLng + (Math.random() - 0.5) * 2 * MAX_JITTER / Math.cos(baseLat * Math.PI / 180);
    return { lat: jitteredLat, lng: jitteredLng };
}

// ============================================================
// === 状态栏 & Logging ===
// ============================================================
var LOG_STYLE = {
    init: 'color: cyan;',
    virtual: 'color: green;',
    real: 'color: yellow;',
    fav: 'color: gold;'
};

function lg(tag, msg, style) {
    console.log('%c ' + tag + ' ' + msg, LOG_STYLE[style] || LOG_STYLE.init);
}

// ============================================================
// === getCurrentPosition Hook ===
// ============================================================
if (typeof Geolocation !== 'undefined' && Geolocation.prototype) {
    Geolocation.prototype.getCurrentPosition = function (success, error, options) {
        var baseLat = getFakeLat() || DEF_LAT;
        var baseLng = getFakeLng() || DEF_LNG;
        var j = applyJitter(baseLat, baseLng);
        var acc = ACC_BASE + (Math.random() * 4 - 2);   // 6~10m 随机
        lg('[GPS Return]', 'Virtual | Lat: ' + j.lat.toFixed(6) + ', Lng: ' + j.lng.toFixed(6) + ' (Acc: ' + acc.toFixed(1) + 'm)', 'virtual');
        var pos = {
            coords: {
                latitude: j.lat,
                longitude: j.lng,
                accuracy: acc,
                altitude: null,
                altitudeAccuracy: null,
                heading: null,
                speed: null
            },
            timestamp: Date.now()
        };
        setTimeout(function () {
            try { success(pos); } catch (e) { console.error('[Virtual GPS] 回调异常', e); }
        }, 0);
    };
    lg('[GPS Hook]', 'getCurrentPosition initialized', 'init');
}

// ============================================================
// === watchPosition Hook ===
// ============================================================
if (typeof Geolocation !== 'undefined' && Geolocation.prototype) {
    var _watchIdCounter = 0;
    var _watchMap = {};                                 // id → 已返回的位置（保证同一 watcher 返回一致坐标）
    Geolocation.prototype.watchPosition = function (success, error, options) {
        var id = ++_watchIdCounter;
        var baseLat = getFakeLat() || DEF_LAT;
        var baseLng = getFakeLng() || DEF_LNG;
        var j = applyJitter(baseLat, baseLng);
        var acc = ACC_BASE + (Math.random() * 4 - 2);
        lg('[GPS Return]', 'Virtual (Watch #' + id + ') | Lat: ' + j.lat.toFixed(6) + ', Lng: ' + j.lng.toFixed(6) + ' (Acc: ' + acc.toFixed(1) + 'm)', 'virtual');
        var pos = {
            coords: {
                latitude: j.lat,
                longitude: j.lng,
                accuracy: acc,
                altitude: null,
                altitudeAccuracy: null,
                heading: null,
                speed: null
            },
            timestamp: Date.now()
        };
        _watchMap[id] = pos;                            // 保存，模拟同一 watcher 的持续一致性
        setTimeout(function () {
            try { success(pos); } catch (e) { console.error('[Virtual GPS] Watch 回调异常', e); }
        }, 0);
        return id;                                      // 返回 watchId，供 clearWatch 使用
    };
    Geolocation.prototype.clearWatch = function (id) {
        if (_watchMap[id]) { delete _watchMap[id]; lg('[GPS Hook]', 'Watch #' + id + ' cleared', 'init'); }
    };
    lg('[GPS Hook]', 'watchPosition initialized', 'init');
}

// ============================================================
// === 样式注入 ===
// ============================================================
GM_addStyle(GM_getResourceText('leafletCSS'));
GM_addStyle(
    // 状态栏（40px，常驻，地图顶部）
    '#vg_status{height:40px;min-height:40px;display:flex;align-items:center;justify-content:space-between;' +
    'padding:0 16px;font-family:"PingFang SC","Microsoft YaHei",sans-serif;font-size:12px;font-weight:600;}' +
    '#vg_status.virtual{background:#4CAF50;color:#fff;}' +
    '#vg_status.real{background:#FF9800;color:#fff;}' +
    '#vg_status .src{background:rgba(255,255,255,.25);padding:2px 8px;border-radius:10px;font-size:11px;}' +

    // 模态框 & 布局
    '#vg_overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.55);' +
    'z-index:99999;display:flex;align-items:center;justify-content:center;}' +
    '#vg_modal{background:#fff;border-radius:12px;width:88vw;max-width:1100px;height:82vh;' +
    'display:flex;flex-direction:column;overflow:hidden;box-shadow:0 20px 60px rgba(0,0,0,.35);}' +
    '#vg_head{padding:12px 16px;font:700 15px/1.4 "PingFang SC","Microsoft YaHei",sans-serif;' +
    'color:#1f2937;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #e5e7eb;}' +
    '#vg_close{cursor:pointer;font-size:22px;color:#9ca3af;line-height:1;padding:0 4px;}' +
    '#vg_close:hover{color:#111827;}' +
    '#vg_body{flex:1;display:flex;min-height:0;}' +

    // 收藏夹侧边栏
    '#vg_side{width:200px;min-width:200px;border-right:1px solid #e5e7eb;display:flex;flex-direction:column;' +
    'font-family:"PingFang SC","Microsoft YaHei",sans-serif;}' +
    '#vg_side_t{padding:10px 12px;font-size:13px;font-weight:700;color:#374151;border-bottom:1px solid #f3f4f6;}' +
    '#vg_side_list{flex:1;overflow-y:auto;padding:4px 6px;}' +
    '.vg_fav{display:flex;justify-content:space-between;align-items:center;padding:8px 6px;' +
    'border-bottom:1px solid #f3f4f6;cursor:pointer;border-radius:6px;}' +
    '.vg_fav:hover{background:#f9fafb;}' +
    '.vg_fav .nm{flex:1;font-size:13px;color:#1f2937;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}' +
    '.vg_fav .del{margin-left:6px;cursor:pointer;font-size:12px;opacity:.6;padding:2px;}' +
    '.vg_fav .del:hover{opacity:1;}' +
    '.vg_empty{color:#9ca3af;font-size:12px;padding:16px 6px;text-align:center;line-height:1.8;}' +

    // 地图
    '#vg_map{flex:1;min-width:0;height:100%;}' +
    '#vg_tip{padding:8px;text-align:center;font-size:12px;color:#6b7280;border-top:1px solid #e5e7eb;' +
    'font-family:"PingFang SC","Microsoft YaHei",sans-serif;}' +

    // 星号按钮
    '#vg_star{margin-top:6px;background:#fff;border:1px solid #d1d5db;border-radius:8px;' +
    'padding:5px 14px;font-size:13px;cursor:pointer;color:#6b7280;transition:.15s;}' +
    '#vg_star:hover{border-color:#f59e0b;color:#f59e0b;}' +
    '#vg_star.on{border-color:#f59e0b;color:#f59e0b;background:#fffbeb;}' +

    '.swal2-container{z-index:100000 !important;}'
);

// ============================================================
// === 模态框 + 地图初始化 ===
// ============================================================
var vgMap = null, vgMarker = null;
var selLat = 0, selLng = 0, selFav = null;

delete L.Icon.Default.prototype._getIconUrl;
L.Icon.Default.mergeOptions({
    iconRetinaUrl: 'https://unpkg.com/leaflet@1.9.4/dist/images/marker-icon-2x.png',
    iconUrl: 'https://unpkg.com/leaflet@1.9.4/dist/images/marker-icon.png',
    shadowUrl: 'https://unpkg.com/leaflet@1.9.4/dist/images/marker-shadow.png'
});

function openModal() {
    if (document.getElementById('vg_overlay')) return;
    if (!document.body) { setTimeout(openModal, 100); return; }

    var overlay = document.createElement('div');
    overlay.id = 'vg_overlay';

    // ============================================================
    // === 状态栏（地图顶部 40px 常驻，避免闪烁） ===
    // ============================================================
    var isVirt = isVirtual();
    var statusHtml;
    if (isVirt) {
        var lat = getFakeLat(), lng = getFakeLng(), ts = getFakeTs();
        var dateStr = ts ? new Date(ts).toLocaleString('zh-CN', { year: 'numeric', month: '2-digit', day: '2-digit', hour: '2-digit', minute: '2-digit' }) : '未知';
        statusHtml =
            '<div id="vg_status" class="virtual">' +
                '<span>✅ 虚拟定位已激活 | 📍 (' + lat.toFixed(4) + ', ' + lng.toFixed(4) + ') | 🕒 ' + dateStr + '</span>' +
                '<span class="src">SRC: Virtual GPS</span>' +
            '</div>';
        lg('[GPS Status]', 'Current Mode: VIRTUAL | (' + lat.toFixed(4) + ', ' + lng.toFixed(4) + ')', 'virtual');
    } else {
        statusHtml =
            '<div id="vg_status" class="real">' +
                '<span>⚠️ 未设定虚拟位置，当前使用浏览器真实定位</span>' +
                '<span class="src">SRC: Browser GPS</span>' +
            '</div>';
        lg('[GPS Status]', 'Current Mode: REAL', 'real');
    }

    overlay.innerHTML =
        '<div id="vg_modal">' +
            statusHtml +
            '<div id="vg_head"><span>🗺️ 设置虚拟定位</span><span id="vg_close" title="关闭">×</span></div>' +
            '<div id="vg_body">' +
                '<div id="vg_side"><div id="vg_side_t">⭐ 我的收藏</div><div id="vg_side_list"></div></div>' +
                '<div id="vg_map"></div>' +
            '</div>' +
            '<div id="vg_tip">滚轮缩放 / 拖拽平移，点击地图选点；点击左侧收藏可直接飞行到该位置</div>' +
        '</div>';
    document.body.appendChild(overlay);
    document.getElementById('vg_close').addEventListener('click', closeModal);

    // 收藏夹事件
    document.getElementById('vg_side_list').addEventListener('click', function (e) {
        var del = e.target.closest('.del');
        if (del) {
            e.stopPropagation();
            favs.splice(+del.dataset.i, 1);
            GM_setValue('vg_favs', favs);
            renderSidebar();
            return;
        }
        var item = e.target.closest('.vg_fav');
        if (item) { selectFromFav(favs[+item.dataset.i]); }
    });
    renderSidebar();

    // ============================================================
    // === 地图初始化：中国视图 [35.0, 105.0] zoom 4 ===
    // ============================================================
    vgMap = L.map('vg_map', { center: [35.0, 105.0], zoom: 4, zoomControl: true, attributionControl: true });
    L.tileLayer('https://tile.openstreetmap.de/{z}/{x}/{y}.png', {
        maxZoom: 19,
        attribution: '&copy; OpenStreetMap contributors'
    }).addTo(vgMap);
    setTimeout(function () { if (vgMap) vgMap.invalidateSize(); }, 200);

    // ============================================================
    // === 状态回显：如果已设定，flyTo 到上次位置 + Marker ===
    // ============================================================
    if (isVirt) {
        var curLat = getFakeLat(), curLng = getFakeLng();
        placeMarker(curLat, curLng);
        vgMap.flyTo([curLat, curLng], 15);
    }

    // ============================================================
    // === 点击事件：选点 → 确认框（含星号收藏） ===
    // ============================================================
    vgMap.on('click', function (e) {
        selLat = e.latlng.lat;
        selLng = e.latlng.lng;
        selFav = null;
        placeMarker(selLat, selLng);
        openConfirm();
    });
}

function placeMarker(lat, lng) {
    if (vgMarker) { vgMap.removeLayer(vgMarker); }
    vgMarker = L.marker([lat, lng]).addTo(vgMap);
}

// === 星号收藏逻辑：从收藏列表 flyTo ===
function selectFromFav(f) {
    if (!f || !vgMap) return;
    selLat = f.lat; selLng = f.lng; selFav = f;
    placeMarker(f.lat, f.lng);
    vgMap.flyTo([f.lat, f.lng], 16);
    setTimeout(openConfirm, 800);
}

// ============================================================
// === 确认弹窗 + 星号收藏 ===
// ============================================================
var _confirmBusy = false;

function openConfirm() {
    if (_confirmBusy) return;
    _confirmBusy = true;

    var lat = selLat, lng = selLng, fav = selFav;
    var starred = !!fav;

    Swal.fire({
        title: '是否将虚拟定位设置为该位置？',
        html:
            '<div style="font-size:14px;color:#374151;line-height:2;">' +
                '纬度: <b>' + lat.toFixed(6) + '</b><br>经度: <b>' + lng.toFixed(6) + '</b><br>' +
                '<button type="button" id="vg_star"' + (starred ? ' class="on"' : '') + '>' +
                    (starred ? '★ 已收藏' : '☆ 收藏此位置') +
                '</button>' +
            '</div>',
        icon: 'question',
        showCancelButton: true,
        confirmButtonText: '确认修改',
        cancelButtonText: '取消',
        confirmButtonColor: '#6366f1',
        didOpen: function () {
            var starBtn = document.getElementById('vg_star');
            if (!starBtn) return;
            starBtn.addEventListener('click', function () {
                if (starred) return;
                starred = true;
                starBtn.className = 'on';
                starBtn.textContent = '★ 已收藏';
                var name = prompt('请输入位置名称（如：教学楼A）', '未命名收藏');
                if (name === null) {
                    starred = false;
                    starBtn.className = '';
                    starBtn.textContent = '☆ 收藏此位置';
                    return;
                }
                name = name.trim() || '未命名收藏';
                var f = { name: name, lat: lat, lng: lng, ts: Date.now() };
                favs.push(f);
                GM_setValue('vg_favs', favs);
                selFav = f;
                fav = f;
                lg('[Favorite Added]', name, 'fav');
                renderSidebar();
            });
        },
        preConfirm: function () { return true; }
    }).then(function (r) {
        _confirmBusy = false;
        if (r.isConfirmed) {
            GM_setValue('vg_lat', lat);
            GM_setValue('vg_lng', lng);
            GM_setValue('vg_ts', Date.now());
            lg('[GPS Status]', '已更新虚拟位置 | Lat: ' + lat + ', Lng: ' + lng, 'virtual');
            closeModal();
        } else {
            if (vgMarker && vgMap) { vgMap.removeLayer(vgMarker); vgMarker = null; }
            selFav = null;
        }
    });
}

// ============================================================
// === 收藏夹渲染 ===
// ============================================================
function renderSidebar() {
    var el = document.getElementById('vg_side_list');
    if (!el) return;
    if (!favs.length) {
        el.innerHTML = '<div class="vg_empty">暂无收藏<br>点击星号添加</div>';
        return;
    }
    el.innerHTML = favs.map(function (f, i) {
        return '<div class="vg_fav" data-i="' + i + '">' +
                    '<span class="nm" title="' + f.name + '">★ ' + f.name + '</span>' +
                    '<span class="del" data-i="' + i + '" title="删除">🗑️</span>' +
                '</div>';
    }).join('');
}

function closeModal() {
    var overlay = document.getElementById('vg_overlay');
    try { if (vgMap) { vgMap.remove(); } } catch (e) { console.warn('[Virtual GPS] 地图销毁异常（已忽略）', e); }
    vgMap = null; vgMarker = null;
    if (overlay) { overlay.remove(); }
}

// ============================================================
// === 注册菜单命令 ===
// ============================================================
GM_registerMenuCommand('设置虚拟定位', openModal);

lg('[GPS Hook]', 'Initialized (getCurrentPosition + watchPosition)', 'init');

})();