(function () {
  'use strict'

  const API = '/api/oss_file_cabinet'
  const state = {
    view: 'icon',
    prefix: '',
    history: [],
    historyIndex: -1,
    items: [],
    selected: new Set(),
    lastSelectedIdx: -1,
    clipboard: null,
    search: '',
    mode: 'files',
    shareToken: '',
    toastTimer: null,
    columnStack: [],
    columnCache: {}
  }

  const $ = (sel) => document.querySelector(sel)
  const $$ = (sel) => Array.from(document.querySelectorAll(sel))

  const showToast = (msg, type) => {
    let t = document.getElementById('globalToast')
    if (!t) {
      t = document.createElement('div')
      t.id = 'globalToast'
      t.className = 'toast'
      document.body.appendChild(t)
    }
    t.textContent = msg
    t.className = 'toast toast-' + (type || 'info')
    t.style.display = 'flex'
    clearTimeout(state.toastTimer)
    state.toastTimer = setTimeout(() => { t.style.display = 'none' }, 2200)
  }

  const formatSize = (bytes) => {
    const b = Number(bytes) || 0
    if (b < 1024) return b + ' B'
    if (b < 1024 * 1024) return (b / 1024).toFixed(1) + ' KB'
    if (b < 1024 * 1024 * 1024) return (b / 1024 / 1024).toFixed(1) + ' MB'
    return (b / 1024 / 1024 / 1024).toFixed(2) + ' GB'
  }

  const formatDate = (ts) => {
    if (!ts) return ''
    const d = new Date(ts)
    const y = d.getFullYear()
    const m = String(d.getMonth() + 1).padStart(2, '0')
    const day = String(d.getDate()).padStart(2, '0')
    const hh = String(d.getHours()).padStart(2, '0')
    const mm = String(d.getMinutes()).padStart(2, '0')
    return y + '-' + m + '-' + day + ' ' + hh + ':' + mm
  }

  const getExt = (name) => {
    const n = String(name || '')
    const idx = n.lastIndexOf('.')
    if (idx < 0 || idx === n.length - 1) return ''
    return n.slice(idx + 1).toLowerCase()
  }

  const getFileIcon = (name, isFolder) => {
    if (isFolder) return '📁'
    const ext = getExt(name)
    const iconMap = {
      jpg: '🖼️', jpeg: '🖼️', png: '🖼️', gif: '🖼️', webp: '🖼️', svg: '🖼️', bmp: '🖼️', ico: '🖼️',
      pdf: '📕',
      doc: '📝', docx: '📝', odt: '📝',
      xls: '📗', xlsx: '📗', csv: '📗', ods: '📗',
      ppt: '📙', pptx: '📙', odp: '📙',
      txt: '📄', md: '📄', log: '📄',
      zip: '📦', rar: '📦', '7z': '📦', tar: '📦', gz: '📦',
      mp3: '🎵', wav: '🎵', flac: '🎵', aac: '🎵', ogg: '🎵',
      mp4: '🎬', mov: '🎬', avi: '🎬', mkv: '🎬', webm: '🎬', flv: '🎬', m4v: '🎬',
      json: '📋', js: '📋', ts: '📋', jsx: '📋', tsx: '📋',
      html: '🌐', css: '🌐', xml: '🌐',
      py: '🐍', java: '☕', c: '⚙️', cpp: '⚙️', h: '⚙️', go: '🐹', rs: '⚙️', sh: '⚙️'
    }
    return iconMap[ext] || '📄'
  }

  const getFileIconClass = (name) => {
    const ext = getExt(name)
    if (['pdf'].includes(ext)) return 'file-red'
    if (['doc', 'docx', 'odt'].includes(ext)) return 'file-blue'
    if (['xls', 'xlsx', 'csv', 'ods'].includes(ext)) return 'file-green'
    if (['ppt', 'pptx', 'odp'].includes(ext)) return 'file-orange'
    if (['mp4', 'mov', 'avi', 'mkv', 'webm', 'flv', 'm4v'].includes(ext)) return 'file-purple'
    if (['mp3', 'wav', 'flac', 'aac', 'ogg'].includes(ext)) return 'file-pink'
    if (['zip', 'rar', '7z', 'tar', 'gz'].includes(ext)) return 'file-yellow'
    if (['jpg', 'jpeg', 'png', 'gif', 'webp', 'svg', 'bmp', 'ico'].includes(ext)) return 'file-image'
    if (['txt', 'md', 'log'].includes(ext)) return 'file-text'
    return 'file-gray'
  }

  const apiGet = (url) => fetch(url, { credentials: 'same-origin' }).then(r => r.json())
  const apiPost = (url, body) => fetch(url, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    credentials: 'same-origin',
    body: body ? JSON.stringify(body) : '{}'
  }).then(r => r.json())

  const apiPostFormData = (url, formData) => fetch(url, {
    method: 'POST',
    credentials: 'same-origin',
    body: formData
  }).then(r => r.json())

  const doLogin = async (user, pass) => {
    const r = await apiPost(API + '/auth/login', { username: user, password: pass })
    return r && r.ok
  }

  const checkAuth = async () => {
    try {
      const r = await apiGet(API + '/auth/me')
      return r && r.ok && r.authorized
    } catch { return false }
  }

  const tryAutoFill = async () => {
    try {
      const token = localStorage.getItem('toolbox_creds_token') || ''
      if (!token) return
      const r = await apiGet(API + '/auth/local_creds?token=' + encodeURIComponent(token))
      if (r && r.ok && r.creds) {
        if (r.creds.username) $('#loginUsername').value = r.creds.username
        if (r.creds.password) $('#loginPassword').value = r.creds.password
      }
    } catch {}
  }

  const clearUrlQuery = () => {
    try {
      if (!window.location.search) return
      const clean = location.pathname + location.hash
      history.replaceState(null, document.title, clean)
    } catch {}
  }

  const main = async () => {
    initTheme()

    // ===== set_token 处理：仅存入 localStorage，不自动登录 =====
    try {
      const params = new URLSearchParams(location.search)
      const setToken = params.get('set_token')
      if (setToken) {
        localStorage.setItem('toolbox_creds_token', setToken)
      }
    } catch {}

    clearUrlQuery()

    // ===== 先检查是否已登录 =====
    const already = await checkAuth()
    if (already) {
      showApp()
      initEvents()
      initDragDrop()
      navigateTo('')
      return
    }

    // ===== 未登录，仅自动填充，不自动提交 =====
    showLogin()
    await tryAutoFill()
    const $loginBtn = $('#loginBtn')
    if ($loginBtn && !$loginBtn.dataset.bound) {
      $loginBtn.dataset.bound = '1'
      $loginBtn.addEventListener('click', async () => {
        const u = $('#loginUsername').value.trim()
        const p = $('#loginPassword').value
        $('#loginError').textContent = ''
        if (!u || !p) { $('#loginError').textContent = '请输入用户名和密码'; return }
        const ok = await doLogin(u, p)
        if (ok) {
          showApp()
          initEvents()
          initDragDrop()
          navigateTo('')
        } else $('#loginError').textContent = '用户名或密码错误'
      })
    }
    $('#loginPassword').addEventListener('keydown', (e) => { if (e.key === 'Enter') $('#loginBtn').click() })
    $('#loginUsername').addEventListener('keydown', (e) => { if (e.key === 'Enter') $('#loginBtn').click() })
  }

  const showLogin = () => {
    $('#loginScreen').style.display = 'flex'
    $('#app').style.display = 'none'
  }

  const showApp = () => {
    $('#loginScreen').style.display = 'none'
    $('#app').style.display = 'block'
  }

  const initTheme = () => {
    const saved = localStorage.getItem('oss_file_cabinet_theme')
    if (saved === 'dark' || (!saved && window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches)) {
      document.documentElement.classList.add('theme-dark')
    }
  }

  const toggleTheme = () => {
    const isDark = document.documentElement.classList.toggle('theme-dark')
    localStorage.setItem('oss_file_cabinet_theme', isDark ? 'dark' : 'light')
  }

  const setBreadcrumb = () => {
    const pb = $('#pathBar')
    pb.innerHTML = ''
    const parts = state.prefix ? state.prefix.split('/').filter(Boolean) : []
    const homeItem = document.createElement('span')
    homeItem.className = 'crumb active'
    homeItem.textContent = ' '
    pb.appendChild(homeItem)
    let accPath = ''
    parts.forEach((p, idx) => {
      const sep = document.createElement('span')
      sep.className = 'crumb-sep'
      sep.textContent = ' | '
      pb.appendChild(sep)
      accPath = accPath ? accPath + '/' + p : p
      const isLast = idx === parts.length - 1
      const target = isLast && state.prefix && state.prefix.endsWith('/') ? accPath + '/' : accPath
      const crumb = document.createElement('span')
      crumb.className = 'crumb'
      crumb.textContent = p
      crumb.addEventListener('click', () => navigateTo(target))
      pb.appendChild(crumb)
    })
  }

  const setStatusBar = () => {
    const total = state.items ? state.items.length : 0
    const sel = state.selected.size
    $('#statusInfo').textContent = total + ' 个项目'
    $('#statusSelect').textContent = sel > 0 ? '已选择 ' + sel + ' 个' : ''
  }

  const buildColumnStack = (prefix) => {
    const parts = String(prefix || '').split('/').filter(Boolean)
    const stack = []
    let currentPrefix = ''
    for (let i = 0; i < parts.length; i++) {
      stack.push({ prefix: currentPrefix, selectedKey: parts[i] })
      currentPrefix = parts.slice(0, i + 1).join('/') + '/'
    }
    stack.push({ prefix: currentPrefix, selectedKey: null })
    return stack
  }

  const navigateTo = (prefix, addHistory) => {
    let clean = String(prefix || '').replace(/[\\]+/g, '/').replace(/\/+/g, '/')
    if (clean.startsWith('/')) clean = clean.slice(1)
    if (clean === '/') clean = ''
    if (clean === state.prefix && addHistory === false) return
    if (addHistory !== false) {
      state.history = state.history.slice(0, state.historyIndex + 1)
      state.history.push(clean)
      state.historyIndex = state.history.length - 1
    }
    state.prefix = clean
    state.selected.clear()
    state.lastSelectedIdx = -1
    state.columnStack = buildColumnStack(clean)
    loadItems()
    setBreadcrumb()
  }

  const goBack = () => {
    if (state.historyIndex > 0) {
      state.historyIndex--
      state.prefix = state.history[state.historyIndex]
      state.selected.clear()
      loadItems()
      setBreadcrumb()
    }
  }

  const goForward = () => {
    if (state.historyIndex < state.history.length - 1) {
      state.historyIndex++
      state.prefix = state.history[state.historyIndex]
      state.selected.clear()
      loadItems()
      setBreadcrumb()
    }
  }

  const goUp = () => {
    if (!state.prefix) return
    const parts = state.prefix.split('/').filter(Boolean)
    parts.pop()
    navigateTo(parts.length ? parts.join('/') + '/' : '')
  }

  const loadItems = async () => {
    if (state.mode === 'trash') { await loadTrash(); return }
    if (state.mode === 'images') { await loadImages(); return }
    const r = await apiGet(API + '/files/list?prefix=' + encodeURIComponent(state.prefix) + (state.search ? '&search=' + encodeURIComponent(state.search) : ''))
    console.log('[oss_file_cabinet] list response', r)
    if (!r || !r.ok) { state.items = []; render(); return }
    state.items = r.items || []
    state.items.sort((a, b) => {
      if (a.isFolder !== b.isFolder) return a.isFolder ? -1 : 1
      return (a.name || '').localeCompare(b.name || '')
    })
    render()
  }

  const loadTrash = async () => {
    const r = await apiGet(API + '/trash/list')
    if (!r || !r.ok) { state.items = []; render(); return }
    state.items = r.items || []
    render()
  }

  const loadImages = async () => {
    const r = await apiGet(API + '/files/list?prefix=')
    if (!r || !r.ok) { state.items = []; render(); return }
    const collect = async (prefix) => {
      const res = await apiGet(API + '/files/list?prefix=' + encodeURIComponent(prefix))
      const out = []
      if (res && res.ok) {
        for (const it of res.items) {
          if (it.isFolder) {
            const nested = await collect(it.key)
            out.push(...nested)
          } else if (it.isImage) out.push(it)
        }
      }
      return out
    }
    state.items = await collect('')
    render()
  }

  const render = () => {
    const area = $('#fileArea')
    area.className = 'file-area ' + state.view + '-view'
    area.innerHTML = ''
    setStatusBar()
    if (!state.items || state.items.length === 0) {
      const empty = document.createElement('div')
      empty.className = 'empty-state'
      empty.innerHTML = '<div class="empty-icon">&#128465;</div>' +
        '<div class="empty-title">空文件夹</div>' +
        '<div class="empty-hint">'+(state.mode === 'trash' ? '废纸篓为空' : '拖拽文件到此处或点击「上传」')+'</div>'
      area.appendChild(empty)
      return
    }

    if (state.view === 'icon') renderIconView(area)
    else if (state.view === 'list') renderListView(area)
    else renderColumnView(area).catch(() => {})
  }

  const renderIconView = (area) => {
    state.items.forEach((it, idx) => {
      const div = document.createElement('div')
      div.className = 'icon-item' + (state.selected.has(it.key) ? ' selected' : '')
      div.dataset.key = it.key
      div.dataset.idx = String(idx)

      const iconWrap = document.createElement('div')
      iconWrap.className = 'icon-wrap ' + getFileIconClass(it.name)
      if (it.isImage && state.mode !== 'trash') {
        const img = document.createElement('img')
        img.src = API + '/files/preview?key=' + encodeURIComponent(it.key)
        img.className = 'icon-thumb'
        img.addEventListener('error', () => { iconWrap.textContent = getFileIcon(it.name, it.isFolder) })
        iconWrap.appendChild(img)
      } else {
        iconWrap.textContent = getFileIcon(it.name, it.isFolder)
      }
      div.appendChild(iconWrap)

      const nameEl = document.createElement('div')
      nameEl.className = 'icon-name'
      nameEl.textContent = it.name || '未命名'
      div.appendChild(nameEl)

      bindItemEvents(div, it, idx)
      area.appendChild(div)
    })
  }

  const renderListView = (area) => {
    const table = document.createElement('div')
    table.className = 'list-table'
    const header = document.createElement('div')
    header.className = 'list-row list-header'
    header.innerHTML = '<div class="col-name">名称</div><div class="col-size">大小</div><div class="col-modified">修改日期</div><div class="col-kind">类型</div>'
    table.appendChild(header)
    state.items.forEach((it, idx) => {
      const row = document.createElement('div')
      row.className = 'list-row' + (state.selected.has(it.key) ? ' selected' : '')
      row.dataset.key = it.key
      row.dataset.idx = String(idx)
      const nameCell = document.createElement('div')
      nameCell.className = 'col-name'
      nameCell.innerHTML = '<span class="row-icon ' + getFileIconClass(it.name) + '">' + getFileIcon(it.name, it.isFolder) + '</span><span>' + (it.name || '未命名') + '</span>'
      row.appendChild(nameCell)
      const szCell = document.createElement('div')
      szCell.className = 'col-size'
      szCell.textContent = it.isFolder ? '-' : formatSize(it.size)
      row.appendChild(szCell)
      const modCell = document.createElement('div')
      modCell.className = 'col-modified'
      modCell.textContent = it.deleted_at ? '删除于 ' + formatDate(it.deleted_at) : formatDate(it.lastModified)
      row.appendChild(modCell)
      const kindCell = document.createElement('div')
      kindCell.className = 'col-kind'
      kindCell.textContent = it.isFolder ? '文件夹' : (it.ext ? it.ext.toUpperCase() : '文件')
      row.appendChild(kindCell)
      bindItemEvents(row, it, idx)
      table.appendChild(row)
    })
    area.appendChild(table)
  }

  const loadColumnItems = async (prefix) => {
    const cacheKey = prefix || '__root__'
    if (state.columnCache[cacheKey]) return state.columnCache[cacheKey]
    try {
      const r = await apiGet(API + '/files/list?prefix=' + encodeURIComponent(prefix))
      const items = (r && r.ok ? r.items : []) || []
      items.sort((a, b) => {
        if (a.isFolder !== b.isFolder) return a.isFolder ? -1 : 1
        return (a.name || '').localeCompare(b.name || '')
      })
      state.columnCache[cacheKey] = items
      return items
    } catch { return [] }
  }

  const renderColumnView = async (area) => {
    area.innerHTML = ''
    if (!state.columnStack || state.columnStack.length === 0) {
      state.columnStack = buildColumnStack(state.prefix)
    }

    let lastSelectedItem = null
    for (let i = 0; i < state.columnStack.length; i++) {
      const colDef = state.columnStack[i]
      const colEl = document.createElement('div')
      colEl.className = 'column'
      const items = await loadColumnItems(colDef.prefix)
      items.forEach((it) => {
        const row = document.createElement('div')
        row.className = 'column-row' + (colDef.selectedKey === it.key ? ' selected' : '')
        row.innerHTML = '<span class="row-icon ' + getFileIconClass(it.name) + '">' + getFileIcon(it.name, it.isFolder) + '</span>' +
          '<span class="col-name-text">' + (it.name || '未命名') + '</span>'
        row.addEventListener('click', (ev) => {
          ev.stopPropagation()
          onColumnItemClick(i, it)
        })
        row.addEventListener('dblclick', (ev) => {
          ev.stopPropagation()
          if (it.isFolder) navigateTo(it.key)
          else if (isPreviewable(it.name)) openFilePreview(it.key, it.name)
          else downloadFile(it.key, it.name)
        })
        colEl.appendChild(row)
        if (colDef.selectedKey === it.key) lastSelectedItem = it
      })
      area.appendChild(colEl)
    }

    const lastCol = state.columnStack[state.columnStack.length - 1]
    if (lastSelectedItem && !lastSelectedItem.isFolder) {
      const infoCol = document.createElement('div')
      infoCol.className = 'column column-hint'
      infoCol.innerHTML = '<div class="column-info-panel">' +
        '<div class="column-info-name">' + (lastSelectedItem.name || '') + '</div>' +
        '<div class="column-info-row">类型：' + (lastSelectedItem.ext ? lastSelectedItem.ext.toUpperCase() + ' 文件' : '文件') + '</div>' +
        '<div class="column-info-row">大小：' + formatSize(lastSelectedItem.size) + '</div>' +
        '<div class="column-info-row">修改日期：' + formatDate(lastSelectedItem.lastModified) + '</div>' +
        '</div>'
      area.appendChild(infoCol)
    } else if (!lastCol.selectedKey) {
      const hintCol = document.createElement('div')
      hintCol.className = 'column column-hint'
      hintCol.innerHTML = '<div class="column-empty">选择一项以查看详情</div>'
      area.appendChild(hintCol)
    }
  }

  const onColumnItemClick = async (colIndex, item) => {
    // Truncate stack after this column
    state.columnStack = state.columnStack.slice(0, colIndex + 1)
    const colDef = state.columnStack[colIndex]
    colDef.selectedKey = item.name
    if (item.isFolder) {
      const nextPrefix = colDef.prefix + item.name + '/'
      state.columnStack.push({ prefix: nextPrefix, selectedKey: null })
      // Pre-load next column into cache for smoother feel
      await loadColumnItems(nextPrefix)
    }
    if (state.view === 'column') renderColumnView($('#fileArea'))
  }

  const updateSelectionUI = () => {
    const elems = $$('#fileArea [data-key]')
    elems.forEach(el => {
      const k = el.dataset.key
      if (state.selected.has(k)) el.classList.add('selected')
      else el.classList.remove('selected')
    })
  }

  const bindItemEvents = (el, item, idx) => {
    el.addEventListener('click', (ev) => {
      ev.stopPropagation()
      const multi = ev.metaKey || ev.ctrlKey
      const range = ev.shiftKey
      if (range && state.lastSelectedIdx >= 0) {
        const lo = Math.min(idx, state.lastSelectedIdx)
        const hi = Math.max(idx, state.lastSelectedIdx)
        for (let i = lo; i <= hi; i++) {
          const k = state.items[i] && state.items[i].key
          if (k) state.selected.add(k)
        }
      } else if (multi) {
        if (state.selected.has(item.key)) state.selected.delete(item.key)
        else state.selected.add(item.key)
      } else {
        state.selected.clear()
        state.selected.add(item.key)
      }
      state.lastSelectedIdx = idx
      updateSelectionUI()
    })

    el.addEventListener('dblclick', (ev) => {
      ev.stopPropagation()
      if (item.isFolder) {
        if (state.mode === 'files') navigateTo(item.key)
      } else if (isPreviewable(item.name) && state.mode !== 'trash') {
        openFilePreview(item.key, item.name)
      } else if (state.mode !== 'trash') {
        downloadFile(item.key, item.name)
      }
    })

    el.addEventListener('contextmenu', (ev) => {
      ev.preventDefault()
      ev.stopPropagation()
      openContextMenu(ev.clientX, ev.clientY, item)
    })
  }

  const openContextMenu = (x, y, firstItem) => {
    hideAllContextMenus()
    const menuId = state.mode === 'trash' ? 'trashContextMenu' : (firstItem ? 'contextMenu' : 'folderContextMenu')
    const menu = document.getElementById(menuId)
    if (!menu) return

    // 文件夹显示"打开"，文件隐藏"打开"
    const openItem = menu.querySelector('.cm-item[data-action="open"]')
    if (openItem) {
      openItem.style.display = (firstItem && firstItem.isFolder) ? 'block' : 'none'
    }

    menu.style.left = x + 'px'
    menu.style.top = y + 'px'
    menu.style.display = 'block'
    const rect = menu.getBoundingClientRect()
    if (rect.right > window.innerWidth - 8) menu.style.left = Math.max(8, window.innerWidth - rect.width - 8) + 'px'
    if (rect.bottom > window.innerHeight - 8) menu.style.top = Math.max(8, window.innerHeight - rect.height - 8) + 'px'
    menu._firstItem = firstItem
  }

  const hideAllContextMenus = () => {
    ['contextMenu', 'folderContextMenu', 'trashContextMenu'].forEach(id => {
      const el = document.getElementById(id)
      if (el) el.style.display = 'none'
    })
  }

  let previewScale = 1
  const isVideo = name => ['mp4', 'mov', 'avi', 'webm', 'mkv', 'flv', 'm4v'].includes(getExt(name))
  const isPdf = name => getExt(name) === 'pdf'
  const isText = name => ['txt', 'md', 'json', 'js', 'ts', 'html', 'css', 'xml', 'log', 'csv', 'yml', 'yaml', 'sh', 'py', 'java', 'c', 'cpp', 'h', 'go', 'rs'].includes(getExt(name))
  const isImage = name => ['jpg', 'jpeg', 'png', 'gif', 'webp', 'svg', 'bmp', 'ico'].includes(getExt(name))
  const isPreviewable = name => isImage(name) || isVideo(name) || isPdf(name) || isText(name)
  const escapeHtml = s => String(s || '').replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;')

  const openFilePreview = async (key, name) => {
    previewScale = 1
    const modal = $('#filePreview')
    const container = $('#previewContainer')
    container.innerHTML = ''
    modal.style.display = 'flex'
    const url = API + '/files/preview?key=' + encodeURIComponent(key)
    if (isVideo(name)) {
      container.innerHTML = '<video controls autoplay style="max-width:100%;max-height:80vh;"><source src="' + url + '" type="video/' + getExt(name) + '"></video>'
    } else if (isPdf(name)) {
      container.innerHTML = '<embed src="' + url + '" type="application/pdf" style="width:90vw;height:85vh;border:none;">'
    } else if (isText(name)) {
      container.innerHTML = '<div id="previewLoading" style="color:var(--text-secondary);padding:40px;">正在加载…</div>'
      try {
        const r = await fetch(url, { credentials: 'include' })
        if (!r.ok) throw new Error('加载失败')
        const text = await r.text()
        container.innerHTML = '<pre style="background:#1e1e1e;color:#d4d4d4;padding:16px;border-radius:6px;max-width:90vw;max-height:80vh;overflow:auto;font-family:monospace;font-size:13px;white-space:pre-wrap;word-break:break-all;">' + escapeHtml(text) + '</pre>'
      } catch (e) {
        container.innerHTML = '<div style="color:var(--danger);padding:40px;">预览加载失败</div>'
      }
    } else {
      container.innerHTML = '<img id="previewImg" src="' + url + '" alt="' + (name || '预览') + '" style="max-width:100%;max-height:80vh;transition:transform .15s ease;">'
    }
  }

  const closeFilePreview = () => {
    $('#filePreview').style.display = 'none'
    previewScale = 1
    $('#previewContainer').innerHTML = ''
  }

  const downloadFile = (key, name) => {
    const url = API + '/files/download?key=' + encodeURIComponent(key)
    const a = document.createElement('a')
    a.href = url
    a.download = name || '文件'
    document.body.appendChild(a)
    a.click()
    document.body.removeChild(a)
  }

  const showModal = (title, bodyHtml, onOk, okText) => {
    $('#modalTitle').textContent = title
    $('#modalBody').innerHTML = bodyHtml || ''
    $('#modalOk').textContent = okText || '确定'
    $('#modalDialog').style.display = 'flex'
    $('#modalCancel').onclick = () => { $('#modalDialog').style.display = 'none' }
    $('#modalOk').onclick = () => {
      if (onOk) {
        const result = onOk()
        if (result === false) return
      }
      $('#modalDialog').style.display = 'none'
    }
    const firstInput = $('#modalBody').querySelector('input, select, textarea')
    if (firstInput) setTimeout(() => firstInput.focus(), 50)
  }

  const handleMenuAction = async (action, firstItem) => {
    if (action === 'open') {
      if (!firstItem) return
      if (firstItem.isFolder) navigateTo(firstItem.key)
      else if (isPreviewable(firstItem.name)) openFilePreview(firstItem.key, firstItem.name)
      else downloadFile(firstItem.key, firstItem.name)
      return
    }
    if (action === 'preview') {
      if (!firstItem || !isPreviewable(firstItem.name)) return
      openFilePreview(firstItem.key, firstItem.name).catch(() => {})
      return
    }
    if (action === 'rename') {
      if (state.selected.size !== 1) return
      const key = Array.from(state.selected)[0]
      const it = state.items.find(x => x.key === key)
      if (!it) return
      showModal('重命名', '<label>名称</label><input id="renameInput" value="' + it.name.replace(/"/g, '&quot;') + '" style="width:100%">', async () => {
        const newName = $('#renameInput').value.trim()
        if (!newName) { showToast('名称不能为空', 'error'); return false }
        const r = await apiPost(API + '/files/rename', { key: key, name: newName })
        if (r && r.ok) { showToast('重命名成功', 'success'); loadItems() }
        else showToast(r && r.error ? r.error : '重命名失败', 'error')
      })
      return
    }
    if (action === 'info') {
      const keys = Array.from(state.selected)
      if (keys.length === 0) return
      const key = keys[0]
      const r = await apiGet(API + '/files/info?key=' + encodeURIComponent(key))
      if (!r || !r.ok) { showToast('获取信息失败', 'error'); return }
      const info = r.info || {}
      const lines = [
        ['名称', info.name],
        ['类型', info.isFolder ? '文件夹' : info.ext ? info.ext.toUpperCase() + ' 文件' : '文件'],
        ['大小', info.isFolder ? '-' : formatSize(info.size)],
        ['修改日期', info.lastModified ? formatDate(info.lastModified) : '-'],
        ['路径', '<code style="font-size:11px;word-break:break-all;">' + (info.fullPath || '') + '</code>']
      ]
      const html = lines.map(l => '<div class="info-row"><span class="info-label">' + l[0] + '</span><span class="info-value">' + l[1] + '</span></div>').join('')
      showModal('简介', html, null, '关闭')
      return
    }
    if (action === 'copy') {
      if (state.selected.size === 0) return
      state.clipboard = { op: 'copy', keys: Array.from(state.selected) }
      showToast('已复制 ' + state.clipboard.keys.length + ' 个项目到剪贴板', 'success')
      return
    }
    if (action === 'move') {
      if (state.selected.size === 0) return
      state.clipboard = { op: 'move', keys: Array.from(state.selected) }
      showToast('已选择 ' + state.clipboard.keys.length + ' 个项目，点击目标文件夹粘贴', 'info')
      return
    }
    if (action === 'paste') {
      if (!state.clipboard || state.clipboard.keys.length === 0) return
      const op = state.clipboard.op
      let okCount = 0
      for (const k of state.clipboard.keys) {
        const r = op === 'copy'
          ? await apiPost(API + '/files/copy', { source: k, dest: state.prefix })
          : await apiPost(API + '/files/move', { source: k, dest: state.prefix })
        if (r && r.ok) okCount++
      }
      if (okCount === state.clipboard.keys.length) {
        showToast(op === 'copy' ? '复制成功' : '移动成功', 'success')
        if (op === 'move') state.clipboard = null
      } else showToast('部分操作失败', 'error')
      loadItems()
      return
    }
    if (action === 'download') {
      const keys = Array.from(state.selected)
      if (keys.length === 0) return
      // 多选或单个文件夹：打包 zip 下载
      if (keys.length > 1 || (keys.length === 1 && state.items.find(x => x.key === keys[0])?.isFolder)) {
        const a = document.createElement('a')
        a.href = API + '/files/batch_download'
        a.download = '归档.zip'
        a.style.display = 'none'
        document.body.appendChild(a)
        // 使用 POST 触发下载
        fetch(API + '/files/batch_download', {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          credentials: 'same-origin',
          body: JSON.stringify({ keys, mode: 'download' })
        }).then(r => {
          if (!r.ok) throw new Error('下载失败')
          return r.blob()
        }).then(blob => {
          const url = URL.createObjectURL(blob)
          const a2 = document.createElement('a')
          a2.href = url
          a2.download = '归档.zip'
          document.body.appendChild(a2)
          a2.click()
          document.body.removeChild(a2)
          URL.revokeObjectURL(url)
        }).catch(() => showToast('下载失败', 'error'))
        return
      }
      // 单选文件：直接下载
      const k = keys[0]
      const it = state.items.find(x => x.key === k)
      const name = it ? it.name : '文件'
      downloadFile(k, name)
      return
    }
    if (action === 'share') {
      if (state.selected.size !== 1) { showToast('请选择一个项目分享', 'info'); return }
      const key = Array.from(state.selected)[0]
      showModal('分享临时链接', '<label>有效期</label><select id="shareTtl" style="width:100%">' +
        '<option value="1">1 小时</option><option value="24" selected>1 天</option><option value="168">7 天</option>' +
        '</select><div class="share-output" id="shareOutput" style="margin-top:12px;"></div>',
        () => {
          const out = $('#shareOutput')
          if (out.dataset.done === '1') return false
          const ttl = Number($('#shareTtl').value) || 24
          out.dataset.done = '1'
          out.innerHTML = '<div class="share-title">正在生成链接…</div>'
          apiPost(API + '/share/create', { key: key, ttl_hours: ttl }).then(async (r) => {
            if (!r || !r.ok) { showToast('分享失败', 'error'); return }
            const shareUrl = location.origin + API + '/share/access/' + r.token
            let copied = false
            try { await navigator.clipboard.writeText(shareUrl); copied = true } catch {}
            out.innerHTML = '<div class="share-title">临时链接（' + ttl + ' 小时后过期）</div>' +
              '<div class="share-url-box" id="shareUrlBox">' + shareUrl + '</div>' +
              (copied ? '<div style="color:var(--success);margin-top:6px;font-size:12px;">已复制到剪贴板</div>' : '')
          })
          return false
        }, '生成并复制')
      return
    }
    if (action === 'raw_url') {
      if (state.selected.size !== 1) { showToast('请选择一个文件', 'info'); return }
      const key = Array.from(state.selected)[0]
      const r = await apiGet(API + '/files/raw_url?key=' + encodeURIComponent(key))
      if (!r || !r.ok || !r.url) { showToast('获取原始链接失败', 'error'); return }
      try {
        await navigator.clipboard.writeText(r.url)
        showToast('原始 OSS 链接已复制', 'success')
      } catch { showToast('复制失败', 'error') }
      return
    }
    if (action === 'delete') {
      const keys = Array.from(state.selected)
      if (keys.length === 0) return
      showModal('确认删除', '<div>将 ' + keys.length + ' 个项目移到废纸篓？</div>', async () => {
        let okCount = 0
        for (const k of keys) {
          const r = await apiPost(API + '/files/delete', { key: k })
          if (r && r.ok) okCount++
        }
        if (okCount === keys.length) showToast('已移到废纸篓', 'success')
        else showToast('部分删除失败', 'error')
        loadItems()
      }, '删除')
      return
    }
    if (action === 'new_folder') {
      showModal('新建文件夹', '<label>名称</label><input id="newFolderName" value="新建文件夹" style="width:100%">', async () => {
        const name = $('#newFolderName').value.trim()
        if (!name) { showToast('名称不能为空', 'error'); return false }
        const r = await apiPost(API + '/files/mkdir', { parent: state.prefix, name: name })
        if (r && r.ok) { showToast('创建成功', 'success'); loadItems() }
        else showToast(r && r.error ? r.error : '创建失败', 'error')
      })
      return
    }
    if (action === 'upload') {
      triggerFileUpload()
      return
    }
    if (action === 'compress') {
      const keys = Array.from(state.selected)
      if (keys.length === 0) return
      showToast('正在压缩...', 'info')
      const r = await apiPost(API + '/files/batch_download', { keys, mode: 'compress', prefix: state.prefix })
      if (r && r.ok) { showToast('已生成 ' + (r.name || '归档.zip'), 'success'); loadItems() }
      else showToast(r && r.error ? r.error : '压缩失败', 'error')
      return
    }
    if (action === 'refresh') { loadItems(); return }
    if (action === 'restore') {
      const keys = Array.from(state.selected)
      if (keys.length === 0) return
      let okCount = 0
      for (const k of keys) {
        const it = state.items.find(x => x.key === k)
        const id = it && it.id
        if (!id) continue
        const r = await apiPost(API + '/trash/restore', { id: id })
        if (r && r.ok) okCount++
      }
      if (okCount === keys.length) showToast('已还原', 'success')
      else showToast('部分还原失败', 'error')
      loadItems()
      return
    }
    if (action === 'empty_perm') {
      const keys = Array.from(state.selected)
      showModal('彻底删除', '<div>此操作不可撤销。确认从 OSS 彻底删除 ' + keys.length + ' 个项目？</div>', async () => {
        const ids = state.items.filter(it => keys.indexOf(it.key) >= 0).map(it => it.id).filter(Boolean)
        const r = await apiPost(API + '/trash/empty', { ids: ids })
        if (r && r.ok) showToast('已彻底删除 ' + r.deleted_count + ' 个项目', 'success')
        else showToast(r && r.error ? r.error : '删除失败', 'error')
        loadItems()
      }, '彻底删除')
      return
    }
  }

  const triggerFileUpload = () => {
    const input = $('#fileInput')
    input.value = ''
    input.click()
  }

  const doUpload = async (files) => {
    const fd = new FormData()
    fd.append('prefix', state.prefix)
    for (const f of files) fd.append('files', f)
    const r = await apiPostFormData(API + '/files/upload', fd)
    if (r && r.ok) { showToast('已上传 ' + (r.results ? r.results.length : 0) + ' 个文件', 'success'); loadItems() }
    else showToast(r && r.error ? r.error : '上传失败', 'error')
  }

  const uploadFiles = async (files) => {
    if (!files || files.length === 0) return
    const oversized = files.some(f => f.size > 50 * 1024 * 1024)
    if (oversized) { showToast('文件超过 50MB 限制', 'error'); return }

    await doUpload(files)
  }

  const initDragDrop = () => {
    const overlay = $('#dropOverlay')
    let dragOver = false
    window.addEventListener('dragenter', (e) => {
      if (state.mode !== 'files') return
      if (e.dataTransfer && Array.from(e.dataTransfer.types || []).indexOf('Files') >= 0) {
        dragOver = true
        overlay.style.display = 'flex'
      }
    })
    window.addEventListener('dragover', (e) => {
      if (dragOver) { e.preventDefault(); e.stopPropagation() }
    })
    window.addEventListener('dragleave', (e) => {
      if (!e.relatedTarget || e.relatedTarget === document.documentElement) {
        dragOver = false
        overlay.style.display = 'none'
      }
    })
    window.addEventListener('drop', (e) => {
      if (dragOver) {
        e.preventDefault()
        overlay.style.display = 'none'
        dragOver = false
        const files = Array.from(e.dataTransfer && e.dataTransfer.files || [])
        uploadFiles(files)
      }
    })
  }

  const initEvents = () => {
    $('#btnThemeToggle').addEventListener('click', toggleTheme)
    $('#btnLogout').addEventListener('click', async () => {
      try { await apiPost(API + '/auth/logout', {}) } catch {}
      showLogin()
    })

    $('#btnBack').addEventListener('click', goBack)
    $('#btnForward').addEventListener('click', goForward)

    $$('.view-btn').forEach(btn => btn.addEventListener('click', () => {
      const view = btn.dataset.view
      if (!view || state.view === view) return
      state.view = view
      $$('.view-btn').forEach(b => b.classList.remove('active'))
      btn.classList.add('active')
      render()
    }))

    $('#searchInput').addEventListener('input', (e) => {
      state.search = e.target.value.trim()
      loadItems()
    })

    $$('.sidebar-item').forEach(item => item.addEventListener('click', () => {
      $$('.sidebar-item').forEach(i => i.classList.remove('active'))
      item.classList.add('active')
      const target = item.dataset.target
      if (target === 'home') { state.mode = 'files'; navigateTo('') }
      else if (target === 'trash') { state.mode = 'trash'; state.prefix = ''; loadItems() }
      else if (target === 'images') { state.mode = 'images'; state.prefix = ''; loadItems() }
    }))

    $('#pathBar').addEventListener('click', (ev) => {
      const crumb = ev.target.closest('.crumb')
      if (!crumb) return
    })

    $('#fileArea').addEventListener('click', (ev) => {
      if (ev.target === $('#fileArea') || ev.target.classList.contains('empty-state') || ev.target.closest('.empty-state')) {
        state.selected.clear()
        state.lastSelectedIdx = -1
        updateSelectionUI()
      }
    })

    $('#fileArea').addEventListener('dblclick', (ev) => {
      if (ev.target === $('#fileArea') || ev.target.classList.contains('empty-state') || ev.target.closest('.empty-state')) {
        if (state.prefix) goUp()
      }
    })

    $('#fileArea').addEventListener('contextmenu', (ev) => {
      if (ev.target === $('#fileArea') || ev.target.classList.contains('empty-state') || ev.target.closest('.empty-state')) {
        ev.preventDefault()
        state.selected.clear()
        updateSelectionUI()
        if (state.mode === 'files') openContextMenu(ev.clientX, ev.clientY, null)
      }
    })

    let dragStart = null
    let dragRect = null
    $('#fileArea').addEventListener('mousedown', (ev) => {
      if (ev.button !== 0) return
      const target = ev.target
      if (target.closest('.icon-item') || target.closest('.list-row') || target.closest('.column-row')) return
      const area = $('#fileArea')
      const rect = area.getBoundingClientRect()
      dragStart = { x: ev.clientX, y: ev.clientY, rect: rect }
      dragRect = document.createElement('div')
      dragRect.className = 'selection-rect'
      dragRect.style.left = ev.clientX + 'px'
      dragRect.style.top = ev.clientY + 'px'
      dragRect.style.width = '0px'
      dragRect.style.height = '0px'
      document.body.appendChild(dragRect)
      ev.preventDefault()
    })

    window.addEventListener('mousemove', (ev) => {
      if (!dragStart || !dragRect) return
      const x1 = dragStart.x
      const y1 = dragStart.y
      const x2 = ev.clientX
      const y2 = ev.clientY
      const left = Math.min(x1, x2)
      const top = Math.min(y1, y2)
      const width = Math.abs(x2 - x1)
      const height = Math.abs(y2 - y1)
      dragRect.style.left = left + 'px'
      dragRect.style.top = top + 'px'
      dragRect.style.width = width + 'px'
      dragRect.style.height = height + 'px'
      const sel = { left, top, right: left + width, bottom: top + height }
      const els = $$('#fileArea .icon-item, #fileArea .list-row, #fileArea .column-row')
      for (const el of els) {
        const r = el.getBoundingClientRect()
        const overlap = !(r.right < sel.left || r.left > sel.right || r.bottom < sel.top || r.top > sel.bottom)
        const k = el.dataset.key
        if (!k) continue
        if (overlap) state.selected.add(k)
        else state.selected.delete(k)
      }
      updateSelectionUI()
    })

    window.addEventListener('mouseup', () => {
      if (dragRect) { try { document.body.removeChild(dragRect) } catch {}; dragRect = null }
      dragStart = null
    })

    document.addEventListener('click', (ev) => {
      if (!ev.target.closest('.context-menu') && !ev.target.closest('.icon-item') && !ev.target.closest('.list-row') && !ev.target.closest('.column-row')) {
        hideAllContextMenus()
      }
    })

    $$('.context-menu .cm-item').forEach(item => {
      item.addEventListener('click', (ev) => {
        ev.stopPropagation()
        const parentMenu = item.closest('.context-menu')
        const first = parentMenu && parentMenu._firstItem
        const action = item.dataset.action
        hideAllContextMenus()
        if (action) handleMenuAction(action, first)
      })
    })

    $('#fileInput').addEventListener('change', (e) => {
      const files = Array.from(e.target.files || [])
      uploadFiles(files)
    })

    $('#closePreview').addEventListener('click', closeFilePreview)
    $('#filePreview').addEventListener('click', (e) => { if (e.target.id === 'filePreview' || e.target.classList.contains('modal-backdrop')) closeFilePreview() })
    $('#filePreview').addEventListener('wheel', (e) => {
      const img = $('#previewImg')
      if (!img) return
      e.preventDefault()
      const delta = e.deltaY > 0 ? -0.15 : 0.15
      previewScale = Math.max(0.3, Math.min(5, previewScale + delta))
      img.style.transform = 'scale(' + previewScale + ')'
    }, { passive: false })

    document.addEventListener('keydown', (e) => {
      if ($('#filePreview').style.display === 'flex') {
        if (e.key === 'Escape') { e.preventDefault(); closeFilePreview() }
        return
      }
      if ($('#modalDialog').style.display === 'flex') {
        if (e.key === 'Escape') { e.preventDefault(); $('#modalDialog').style.display = 'none' }
        if (e.key === 'Enter') { e.preventDefault(); $('#modalOk').click() }
        return
      }
      if ((e.metaKey || e.ctrlKey) && e.key.toLowerCase() === 'a') {
        if (state.items.length > 0 && document.activeElement && document.activeElement.tagName !== 'INPUT') {
          e.preventDefault()
          state.selected.clear()
          state.items.forEach(it => state.selected.add(it.key))
          render()
        }
      }
      if (e.key === 'Backspace' && document.activeElement && document.activeElement.tagName !== 'INPUT') {
        if (state.mode === 'files') { e.preventDefault(); goUp() }
      }
      if (e.key === 'Delete' && document.activeElement && document.activeElement.tagName !== 'INPUT') {
        if (state.selected.size > 0) { e.preventDefault(); handleMenuAction(state.mode === 'trash' ? 'empty_perm' : 'delete') }
      }
      if ((e.metaKey || e.ctrlKey) && e.key.toLowerCase() === 'c' && state.selected.size > 0) {
        e.preventDefault()
        state.clipboard = { op: 'copy', keys: Array.from(state.selected) }
        showToast('已复制 ' + state.clipboard.keys.length + ' 个项目到剪贴板', 'success')
      }
      if ((e.metaKey || e.ctrlKey) && e.key.toLowerCase() === 'v' && state.clipboard && state.mode === 'files') {
        e.preventDefault()
        handleMenuAction('paste')
      }
    })

    // 系统剪贴板粘贴：Ctrl+V 时如果剪贴板有文件，直接上传
    document.addEventListener('paste', (e) => {
      if (state.mode !== 'files') return
      const items = e.clipboardData && e.clipboardData.items
      if (!items) return
      const files = []
      for (let i = 0; i < items.length; i++) {
        if (items[i].kind === 'file') files.push(items[i].getAsFile())
      }
      if (files.length > 0) {
        e.preventDefault()
        uploadFiles(files)
      }
    })
  }

  document.addEventListener('DOMContentLoaded', main)
})()