$(document).ready(async function () {
    var apiBase = window.location.origin + '/seeyon/rest/fileUpload';
    var rootFolders = [];
    var activeFolder = null;
    var currentFilePage = 1;
    var filePageSize = 10;
    var searchKeyword = null;

    // ========== 初始化：获取bizId → 获取folderId → 加载文件列表 ==========
    try {
        // 从URL参数或window对象获取bizId
        var urlParams = new URLSearchParams(window.location.search);
        var bizId = urlParams.get('bizId') || window._bizId || '';

        // 缓存folderId
        var cachedFolderId = '';

        // 如果有bizId，调接口获取folderId
        if (bizId) {
            cachedFolderId = await fetchFolderIdByBizId(bizId) || '';
        }
        // 如果没有通过bizId获取到，尝试用URL中的folderId
        if (!cachedFolderId) {
            cachedFolderId = urlParams.get('folderId') || '';
        }

        // 存储到全局变量供上传和OK()使用
        window._currentFolderId = cachedFolderId;
        window._bizId = bizId;
        window._uploadedFiles = []; // 缓存本次上传成功的文件信息

        // 加载文件列表
        if (cachedFolderId) {
            activeFolder = { id: cachedFolderId, name: '指定文件夹' };
            var files = await fetchFiles(cachedFolderId);
            renderFileList(files);
        }
    } catch (e) {
        console.error('初始化失败:', e);
        $('#file-list').html('<div style="padding:12px;color:#e74c3c;">加载文件夹失败</div>');
    }

    /**
     * 通过业务ID调后端接口获取网盘文件夹ID
     * @param {string} bizId - 业务ID（资产编号）
     * @returns {Promise<string|null>} folderId
     */
    async function fetchFolderIdByBizId(bizId) {
        if (!bizId) return null;
        try {
            var res = await $.ajax({
                url: apiBase + '/folder/by-bizid?bizId=' + encodeURIComponent(bizId),
                type: 'GET',
                dataType: 'json'
            });
            if (res.code === 0 && res.data) {
                var folderId = res.data.folderId || res.data.id || '';
                console.log('[fileUploadBiz] 获取folderId:', folderId, 'bizId:', bizId);
                return folderId;
            }
        } catch (e) {
            console.error('[fileUploadBiz] 获取folderId失败:', e);
        }
        return null;
    }

    // ========== API 调用 ==========

    async function fetchFolders(folderId) {
        var res = await $.ajax({
            url: apiBase + '/folder/children?folderId=' + folderId,
            type: 'GET',
            dataType: 'json'
        });
        if (res.code === 0 && res.data) {
            return res.data.folders || [];
        }
        return [];
    }

    async function fetchFiles(folderId, pageNum, pageSize) {
        var res = await $.ajax({
            url: apiBase + '/folder/children?folderId=' + folderId,
            type: 'GET',
            dataType: 'json'
        });
        if (res.code === 0 && res.data) {
            return res.data.files || [];
        }
        return [];
    }

    async function searchFiles(keyword) {
        var res = await $.ajax({
            url: apiBase + '/file/search?keyword=' + encodeURIComponent(keyword),
            type: 'GET',
            dataType: 'json'
        });
        if (res.code === 0 && res.data) {
            return Array.isArray(res.data) ? res.data : (res.data.files || []);
        }
        return [];
    }

    // ========== 左侧文件夹树 ==========

    function renderSidebar() {
        var sidebar = $('#sideBar');
        sidebar.empty();
        rootFolders.forEach(function (folder) {
            var categoryEl = $(
                '<div class="category">' +
                '<div class="category-title"><span class="icon">▶</span> ' + (folder.name || '文件夹') + '</div>' +
                '<div class="folder-list"></div>' +
                '</div>'
            );
            var folderList = categoryEl.find('.folder-list');
            categoryEl.find('.category-title').click(async function () {
                if (!folder.loaded) {
                    var subFolders = await fetchFolders(folder.id);
                    subFolders.forEach(function (sub) { renderFolder(sub, folderList); });
                    folder.loaded = true;
                }
                folderList.slideToggle();
                var icon = categoryEl.find('.icon');
                icon.text(icon.text() === '▶' ? '▼' : '▶');
            });
            sidebar.append(categoryEl);
        });
    }

    function renderFolder(node, container) {
        var subFolderList = $('<div class="folder-list"></div>');
        var paginationControls = $('<div class="folder-pagination"></div>');
        var page = 1;
        var pageSize = 10;
        var hasMore = true;

        var folderItem = $(
            '<div class="folder-item"><span class="icon">▶</span> ' + (node.name || '文件夹') + '</div>'
        );

        folderItem.click(async function (e) {
            e.stopPropagation();
            activeFolder = node;
            // 高亮当前选中文件夹
            $('.folder-item').removeClass('active');
            folderItem.addClass('active');
            subFolderList.toggle();

            if (subFolderList.is(':visible') && !node.loaded) {
                await loadSubFolderPage();
                node.loaded = true;
            }

            // 加载文件列表
            var files = await fetchFiles(node.id);
            renderFileList(files);

            var icon = folderItem.find('.icon');
            icon.text(icon.text() === '▶' ? '▼' : '▶');
        });

        async function loadSubFolderPage() {
            var subFolders = await fetchFolders(node.id);
            subFolderList.empty();
            subFolders.forEach(function (sub) { renderFolder(sub, subFolderList); });
            hasMore = false; // 简化：不分页子文件夹
            renderFolderPagination();
        }

        function renderFolderPagination() {
            paginationControls.empty();
            var prevBtn = $('<button class="folder-page-btn">上一页</button>');
            var nextBtn = $('<button class="folder-page-btn">下一页</button>');
            var pageInfo = $('<span style="font-size:12px;color:#666;">第 ' + page + ' 页</span>');
            prevBtn.prop('disabled', page === 1);
            nextBtn.prop('disabled', !hasMore);
            prevBtn.click(async function () { if (page > 1) { page--; await loadSubFolderPage(); } });
            nextBtn.click(async function () { if (hasMore) { page++; await loadSubFolderPage(); } });
            paginationControls.append(prevBtn, pageInfo, nextBtn);
            subFolderList.append(paginationControls);
        }

        container.append(folderItem);
        container.append(subFolderList);
    }

    // ========== 右侧文件列表 ==========

    function renderFileList(files) {
        var container = $('#file-list');
        container.empty();
        if (!files || files.length === 0) {
            container.html('<div class="file-empty">此文件夹为空</div>');
            return;
        }
        files.forEach(function (f) {
            var ext = (f.extension || f.name.split('.').pop() || '').toUpperCase();
            var isImage = /^(JPG|JPEG|PNG|GIF|BMP|WEBP|SVG|ICO)$/.test(ext);
            var isVideo = /^(MP4|AVI|MOV|WMV|FLV|MKV|WEBM)$/.test(ext);
            var previewUrl = f.previewUrl || f.preview_url || f.downloadUrl || f.download_url || '';
            var thumbHtml = '';

            if (isImage && previewUrl) {
                thumbHtml = '<div class="file-thumb"><img src="' + previewUrl + '" loading="lazy" onerror="this.parentNode.innerHTML=\'<span class=file-ext>' + ext.substring(0, 4) + '</span>\'"></div>';
            } else if (isVideo) {
                thumbHtml = '<div class="file-thumb file-thumb-video"><span class="file-ext">' + ext.substring(0, 4) + '</span><span class="play-icon">▶</span></div>';
            } else {
                thumbHtml = '<div class="file-ext">' + ext.substring(0, 4) + '</div>';
            }

            var fileItem = $(
                '<div class="file-item">' +
                '<input type="checkbox" ' +
                    'data-filekey="' + (f.id || f.fileKey || '') + '" ' +
                    'data-filename="' + (f.name || '') + '" ' +
                    'data-filesize="' + (f.size || 0) + '" ' +
                    'data-fileext="' + ext + '" ' +
                    'data-previewurl="' + previewUrl + '">' +
                thumbHtml +
                '<div class="file-info">' +
                '<div class="name">' + (f.name || '文件') + '</div>' +
                '<div class="size">' + formatSize(f.size) + '</div>' +
                '</div></div>'
            );
            // 点击整行切换勾选
            fileItem.click(function (e) {
                if (e.target.type !== 'checkbox') {
                    var cb = $(this).find('input[type="checkbox"]');
                    cb.prop('checked', !cb.prop('checked'));
                }
                $(this).toggleClass('selected', $(this).find('input[type="checkbox"]').prop('checked'));
            });
            container.append(fileItem);
        });
    }

    function formatSize(bytes) {
        if (!bytes) return '';
        bytes = parseInt(bytes);
        if (bytes < 1024) return bytes + ' B';
        if (bytes < 1048576) return (bytes / 1024).toFixed(1) + ' KB';
        if (bytes < 1073741824) return (bytes / 1048576).toFixed(1) + ' MB';
        return (bytes / 1073741824).toFixed(1) + ' GB';
    }

    // ========== 搜索 ==========

    $('#searchBtn').click(async function () {
        searchKeyword = $('#search').val().trim();
        if (!searchKeyword) {
            // 清空搜索，重新加载当前文件夹
            if (activeFolder) {
                var files = await fetchFiles(activeFolder.id);
                renderFileList(files);
            }
            return;
        }
        var files = await searchFiles(searchKeyword);
        renderFileList(files);
    });

    $('#search').keyup(function (e) {
        if (e.key === 'Enter') $('#searchBtn').click();
    });

    // ========== 上传文件 ==========

    $('#uploadBtn').click(function () {
        var input = document.createElement('input');
        input.type = 'file';
        input.multiple = true;
        input.style.display = 'none';
        input.addEventListener('change', async function () {
            var fileArr = Array.from(input.files);
            if (fileArr.length === 0) return;
            var folderId = window._currentFolderId || 0;
            for (var i = 0; i < fileArr.length; i++) {
                await uploadFile(fileArr[i], folderId);
            }
            // 上传完成后刷新文件列表（不刷新页面，保留缓存数据）
            var files = await fetchFiles(folderId);
            renderFileList(files);
            // 自动勾选刚上传的文件
            window._uploadedFiles.forEach(function (uf) {
                var cb = document.querySelector('#file-list input[data-filekey="' + uf.fileKey + '"]');
                if (cb && !cb.checked) {
                    cb.checked = true;
                    cb.closest('.file-item').classList.add('selected');
                }
            });
            input.remove();
        });
        document.body.appendChild(input);
        input.click();
    });

    async function uploadFile(file, folderId) {
        var formData = new FormData();
        formData.append('file', file);
        formData.append('folderId', folderId || 0);
        formData.append('fileName', file.name);
        try {
            var res = await $.ajax({
                url: apiBase + '/upload',
                type: 'POST',
                data: formData,
                processData: false,
                contentType: false
            });
            if (res.code !== 0) {
                alert('上传失败：' + (res.message || '未知错误'));
                return false;
            }
            // 缓存上传成功的文件信息供OK()返回
            if (res.data) {
                window._uploadedFiles.push({
                    fileKey: res.data.id || '',
                    fileName: res.data.name || file.name
                });
            }
            return true;
        } catch (e) {
            alert('上传失败：网络错误');
            return false;
        }
    }
});