const apiBase = '/api/private_clipboard'

const $ = id => document.getElementById(id)
const state = {
  items: [],
  folders: [],
  filter: { type: 'all', keyword: '', view: 'all', folderCode: 'all' },
  favoriteDraft: { id: null },
  viewer: { images: [], index: 0 }
}
const normalizeError = (error) => {
  const text = String(error && error.message ? error.message : error || '').trim()
  if (!text) return 'unknown_error'
  return text
}
const folderDisplayName = (code) => {
  const folder = state.folders.find(item => item.code === code)
  return folder ? folder.name : '未命名目录'
}

const clearUrlQuery = () => {
  try {
    if (!window.location.search) return
    const cleanUrl = `${window.location.pathname}${window.location.hash || ''}`
    window.history.replaceState({}, '', cleanUrl)
  } catch {}
}

const fmtDateTime = (ts) => {
  const date = new Date(ts || Date.now())
  try {
    const s = new Intl.DateTimeFormat('zh-CN', { timeZone: 'Asia/Shanghai', year: 'numeric', month: '2-digit', day: '2-digit', hour: '2-digit', minute: '2-digit', second: '2-digit', hour12: false }).format(date)
    return s.replace(/\//g, '-').replace(/\u200E/g, '')
  } catch {
    const pad = n => String(n).padStart(2, '0')
    return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())} ${pad(date.getHours())}:${pad(date.getMinutes())}:${pad(date.getSeconds())}`
  }
}

const fmtSize = (bytes) => {
  const n = Number(bytes || 0)
  if (!n) return '0 B'
  const units = ['B', 'KB', 'MB', 'GB']
  let size = n
  let idx = 0
  while (size >= 1024 && idx < units.length - 1) {
    size /= 1024
    idx += 1
  }
  return `${size.toFixed(size >= 100 ? 0 : size >= 10 ? 1 : 2)} ${units[idx]}`
}

const setStatus = (text, type) => {
  const el = $('pc-status')
  if (!el) return
  el.textContent = text || ''
  el.className = 'pc-status' + (type ? ` ${type}` : '')
}

const setProgress = (show, done, total) => {
  const box = $('pc-progress')
  const text = $('pc-progress-text')
  const percent = $('pc-progress-percent')
  const fill = $('pc-progress-fill')
  if (!box || !text || !percent || !fill) return
  if (!show) {
    box.className = 'pc-progress'
    fill.style.width = '0%'
    text.textContent = ''
    percent.textContent = ''
    return
  }
  const safeTotal = Math.max(1, Number(total || 0))
  const safeDone = Math.min(safeTotal, Math.max(0, Number(done || 0)))
  const pct = Math.round((safeDone / safeTotal) * 100)
  box.className = 'pc-progress show'
  text.textContent = `上传进度 ${safeDone}/${safeTotal}`
  percent.textContent = `${pct}%`
  fill.style.width = `${pct}%`
}

const copyTextToClipboard = async (text) => {
  try {
    await navigator.clipboard.writeText(text)
    setStatus('已复制到剪贴板', 'ok')
    setTimeout(() => setStatus('', ''), 2000)
  } catch (e) {
    setStatus('复制失败', 'error')
    setTimeout(() => setStatus('', ''), 2000)
  }
}

const copyImageToClipboard = async (url) => {
  try {
    const response = await fetch(url)
    const blob = await response.blob()
    const item = new ClipboardItem({ [blob.type]: blob })
    await navigator.clipboard.write([item])
    setStatus('已复制图片到剪贴板', 'ok')
    setTimeout(() => setStatus('', ''), 2000)
  } catch (e) {
    setStatus('复制图片失败', 'error')
    setTimeout(() => setStatus('', ''), 2000)
  }
}

const detectMobile = () => {
  if (window.matchMedia) {
    return window.matchMedia('(max-width: 900px), (pointer: coarse)').matches
  }
  const ua = navigator.userAgent || ''
  return /Android|iPhone|iPad|iPod|Mobile/i.test(ua)
}

const createGroupId = () => -(Date.now() * 1000 + Math.floor(Math.random() * 1000))

const updateViewer = () => {
  const img = $('pc-viewer-img')
  const count = $('pc-viewer-count')
  const prev = $('pc-viewer-prev')
  const next = $('pc-viewer-next')
  const total = state.viewer.images.length
  const idx = Math.max(0, Math.min(state.viewer.index, total - 1))
  state.viewer.index = idx
  const current = state.viewer.images[idx]
  if (img) {
    img.src = current ? current.url : ''
    img.alt = current ? current.name : ''
  }
  if (count) count.textContent = total ? `${idx + 1} / ${total}` : ''
  if (prev) prev.classList.toggle('disabled', idx <= 0)
  if (next) next.classList.toggle('disabled', idx >= total - 1)
}

const openViewerAt = (images, index) => {
  const viewer = $('pc-viewer')
  if (!viewer || !Array.isArray(images) || !images.length) return
  state.viewer.images = images
  state.viewer.index = Math.max(0, Math.min(index, images.length - 1))
  viewer.classList.add('show')
  document.body.style.overflow = 'hidden'
  updateViewer()
}

const closeViewer = () => {
  const viewer = $('pc-viewer')
  if (viewer) viewer.classList.remove('show')
  document.body.style.overflow = ''
}

const stepViewer = (delta) => {
  const total = state.viewer.images.length
  if (!total) return
  const next = state.viewer.index + delta
  if (next < 0 || next >= total) return
  state.viewer.index = next
  updateViewer()
}

const apiJson = async (url, options) => {
  const res = await fetch(url, options || {})
  const contentType = res.headers.get('content-type') || ''
  if (!contentType.includes('application/json')) {
    if (res.status === 401) throw new Error('unauthorized')
    throw new Error(`unexpected_response_${res.status}`)
  }
  const data = await res.json()
  if (!data || !data.ok) throw new Error((data && data.error) || 'request_failed')
  return data
}

const fetchFolders = async () => {
  const data = await apiJson(`${apiBase}/folders`, { cache: 'no-store' })
  state.folders = Array.isArray(data.folders) ? data.folders : []
  renderFolderFilters()
  renderFolderList()
}

const fetchList = async () => {
  const data = await apiJson(`${apiBase}/list`, { cache: 'no-store' })
  state.items = Array.isArray(data.items) ? data.items : []
  renderList()
}

const renderFolderFilters = () => {
  const wrap = $('pc-favorite-filter')
  const select = $('pc-folder-select')
  const favoriteSelect = $('pc-favorite-folder-select')
  const viewTitle = $('pc-view-title')
  if (viewTitle) viewTitle.textContent = state.filter.view === 'favorites' ? '我的收藏' : '全部内容'
  if (wrap) wrap.style.display = state.filter.view === 'favorites' ? '' : 'none'
  const fillSelect = (target, withAll) => {
    if (!target) return
    const old = String(target.value || '')
    target.innerHTML = ''
    if (withAll) {
      const opt = document.createElement('option')
      opt.value = 'all'
      opt.textContent = '全部目录'
      target.appendChild(opt)
    }
    state.folders.forEach(folder => {
      const opt = document.createElement('option')
      opt.value = folder.code
      opt.textContent = `${folder.name} (${Number(folder.favorite_count || 0)})`
      target.appendChild(opt)
    })
    if (withAll) {
      target.value = state.folders.some(f => f.code === state.filter.folderCode) ? state.filter.folderCode : 'all'
      state.filter.folderCode = String(target.value || 'all')
    } else if (state.folders.length) {
      target.value = state.folders.some(f => f.code === old) ? old : state.folders[0].code
    }
  }
  fillSelect(select, true)
  fillSelect(favoriteSelect, false)
}

const renderFolderList = () => {
  const list = $('pc-folder-list')
  if (!list) return
  list.innerHTML = ''
  if (!state.folders.length) {
    const empty = document.createElement('div')
    empty.className = 'pc-folder-empty'
    empty.textContent = '暂无目录，请先新增目录'
    list.appendChild(empty)
    return
  }
  state.folders.forEach(folder => {
    const row = document.createElement('div')
    row.className = 'pc-folder-row'
    const nameInput = document.createElement('input')
    nameInput.value = folder.name || ''
    nameInput.placeholder = '目录名称'
    const sortInput = document.createElement('input')
    sortInput.type = 'number'
    sortInput.min = '1'
    sortInput.step = '1'
    sortInput.value = String(Number(folder.sort_order || 1))
    const count = document.createElement('div')
    count.className = 'pc-folder-count'
    count.textContent = `收藏 ${Number(folder.favorite_count || 0)}`
    const saveBtn = document.createElement('button')
    saveBtn.className = 'btn'
    saveBtn.type = 'button'
    saveBtn.textContent = '保存'
    saveBtn.onclick = async () => {
      try {
        const payload = {
          name: String(nameInput.value || '').trim(),
          sort_order: Number.parseInt(String(sortInput.value || ''), 10)
        }
        await apiJson(`${apiBase}/folders/${encodeURIComponent(folder.code)}`, {
          method: 'PATCH',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify(payload)
        })
        await Promise.all([fetchFolders(), fetchList()])
        setStatus('目录已更新', 'ok')
      } catch (e) {
        setStatus(`目录更新失败: ${normalizeError(e)}`, 'error')
      }
    }
    const delBtn = document.createElement('button')
    delBtn.className = 'btn'
    delBtn.type = 'button'
    delBtn.textContent = '删除'
    delBtn.onclick = async () => {
      try {
        await apiJson(`${apiBase}/folders/${encodeURIComponent(folder.code)}`, { method: 'DELETE' })
        await Promise.all([fetchFolders(), fetchList()])
        setStatus('目录已删除', 'ok')
      } catch (e) {
        const code = normalizeError(e)
        if (code === 'folder_not_empty') setStatus('目录下还有收藏内容，不能删除。请先取消收藏或迁移。', 'error')
        else setStatus(`删除目录失败: ${code}`, 'error')
      }
    }
    row.appendChild(nameInput)
    row.appendChild(sortInput)
    row.appendChild(count)
    row.appendChild(saveBtn)
    row.appendChild(delBtn)
    list.appendChild(row)
  })
}

const openFavoriteModal = (id) => {
  state.favoriteDraft.id = id
  renderFolderFilters()
  const modal = $('pc-favorite-modal')
  if (modal) modal.classList.add('show')
}

const closeFavoriteModal = () => {
  state.favoriteDraft.id = null
  const modal = $('pc-favorite-modal')
  if (modal) modal.classList.remove('show')
}

const openFolderModal = () => {
  const modal = $('pc-folder-modal')
  if (modal) modal.classList.add('show')
}

const closeFolderModal = () => {
  const modal = $('pc-folder-modal')
  if (modal) modal.classList.remove('show')
}

const favoriteItem = async (id, folderCode) => {
  await apiJson(`${apiBase}/favorite`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ id, folder_code: folderCode })
  })
  await Promise.all([fetchFolders(), fetchList()])
}

const unfavoriteItem = async (id) => {
  await apiJson(`${apiBase}/unfavorite`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ id })
  })
  await Promise.all([fetchFolders(), fetchList()])
}

const renderList = () => {
  const list = $('pc-items')
  const empty = $('pc-empty')
  const count = $('pc-count')
  if (!list || !empty) return
  list.innerHTML = ''
  const filtered = state.items.filter(item => {
    if (state.filter.view === 'favorites' && !item.is_favorite) return false
    if (state.filter.view === 'favorites' && state.filter.folderCode !== 'all' && item.favorite_folder_code !== state.filter.folderCode) return false
    const t = state.filter.type
    const types = Array.isArray(item.group_types) && item.group_types.length ? item.group_types : [item.type].filter(Boolean)
    if (t && t !== 'all' && !types.includes(t)) return false
    const kw = state.filter.keyword.trim().toLowerCase()
    if (!kw) return true
    const parts = [item.text_content || '', item.favorite_folder_name || '']
    if (Array.isArray(item.items)) {
      item.items.forEach(i => {
        if (i.file_name) parts.push(i.file_name)
      })
    }
    const hay = parts.join(' ').toLowerCase()
    return hay.includes(kw)
  })
  if (count) count.textContent = filtered.length ? `(${filtered.length})` : ''
  if (!filtered.length) {
    empty.style.display = ''
    return
  }
  empty.style.display = 'none'
  filtered.forEach(item => {
    const card = document.createElement('div')
    card.className = 'pc-item'

    const header = document.createElement('div')
    header.className = 'pc-item-header'

    const meta = document.createElement('div')
    meta.className = 'pc-item-meta'
    const type = document.createElement('span')
    type.className = 'pc-item-type'
    type.textContent = item.type === 'image' ? '图片' : item.type === 'file' ? '文件' : item.type === 'mixed' ? '组合' : '文字'
    const time = document.createElement('span')
    time.textContent = fmtDateTime(item.created_at)
    meta.appendChild(type)
    meta.appendChild(time)
    if (item.is_favorite) {
      const tag = document.createElement('span')
      tag.className = 'pc-favorite-tag'
      tag.textContent = `收藏于: ${folderDisplayName(item.favorite_folder_code)}`
      meta.appendChild(tag)
    }

    const actions = document.createElement('div')
    actions.className = 'pc-item-actions'

    if (item.text_content) {
      const copyBtn = document.createElement('button')
      copyBtn.className = 'btn'
      copyBtn.type = 'button'
      copyBtn.textContent = '复制文字'
      copyBtn.addEventListener('click', () => copyTextToClipboard(item.text_content || ''))
      actions.appendChild(copyBtn)
    }

    if (item.is_favorite) {
      const unfavBtn = document.createElement('button')
      unfavBtn.className = 'btn'
      unfavBtn.type = 'button'
      unfavBtn.textContent = '取消收藏'
      unfavBtn.onclick = async () => {
        try {
          await unfavoriteItem(item.id)
          setStatus('已取消收藏', 'ok')
        } catch (e) {
          setStatus(`取消收藏失败: ${normalizeError(e)}`, 'error')
        }
      }
      actions.appendChild(unfavBtn)
    } else {
      const favBtn = document.createElement('button')
      favBtn.className = 'btn'
      favBtn.type = 'button'
      favBtn.textContent = '收藏'
      favBtn.onclick = () => {
        if (!state.folders.length) {
          openFolderModal()
          setStatus('请先创建目录，再进行收藏', 'error')
          return
        }
        openFavoriteModal(item.id)
      }
      actions.appendChild(favBtn)
    }

    const delBtn = document.createElement('button')
    delBtn.className = 'btn'
    delBtn.type = 'button'
    delBtn.textContent = '删除'
    if (item.is_favorite) {
      delBtn.disabled = true
      delBtn.title = '请先取消收藏才能删除'
      delBtn.classList.add('disabled')
      delBtn.addEventListener('click', () => setStatus('请先取消收藏，再删除内容', 'error'))
    } else {
      delBtn.addEventListener('click', async () => {
        try {
          await deleteItem(item.id)
          await fetchFolders()
        } catch (e) {
          const code = normalizeError(e)
          if (code === 'item_favorited') setStatus('请先取消收藏，再删除内容', 'error')
          else setStatus(`删除失败: ${code}`, 'error')
        }
      })
    }
    actions.appendChild(delBtn)

    header.appendChild(meta)
    header.appendChild(actions)
    card.appendChild(header)

    if (item.text_content) {
      const text = document.createElement('div')
      text.className = 'pc-item-text'
      text.textContent = item.text_content || ''
      card.appendChild(text)
    }

    if (item.items && item.items.length) {
      const items = Array.isArray(item.items) ? item.items : []
      const images = items.filter(i => i.type === 'image')
      const files = items.filter(i => i.type === 'file')
      if (images.length) {
        const grid = document.createElement('div')
        grid.className = 'pc-image-grid'
        const viewImages = images.map(i => ({ url: i.file_url, name: i.file_name || '图片' }))
        images.forEach((imgItem, idx) => {
          const wrap = document.createElement('div')
          wrap.className = 'pc-image-thumb'
          const img = document.createElement('img')
          img.src = imgItem.file_url
          img.alt = imgItem.file_name || 'image'
          wrap.appendChild(img)
          wrap.addEventListener('click', () => openViewerAt(viewImages, idx))
          grid.appendChild(wrap)
        })
        card.appendChild(grid)
      }
      if (files.length) {
        files.forEach(fileItem => {
          const row = document.createElement('div')
          row.className = 'pc-file-row'
          const name = document.createElement('div')
          name.className = 'pc-file-name'
          name.textContent = fileItem.file_name || '文件'
          const metaText = document.createElement('div')
          metaText.className = 'pc-file-meta'
          metaText.textContent = fmtSize(fileItem.file_size)
          const copyUrlBtn = document.createElement('button')
          copyUrlBtn.className = 'btn'
          copyUrlBtn.textContent = '复制URL'
          copyUrlBtn.onclick = () => {
            const url = new URL(fileItem.file_url, window.location.origin).href
            copyTextToClipboard(url)
          }
          const download = document.createElement('a')
          download.className = 'btn'
          download.href = fileItem.file_url
          download.download = fileItem.file_name || ''
          download.textContent = '下载'
          row.appendChild(name)
          row.appendChild(metaText)
          row.appendChild(copyUrlBtn)
          row.appendChild(download)
          card.appendChild(row)
        })
      }
    }
    list.appendChild(card)
  })
}

const saveText = async (text) => {
  const res = await fetch(`${apiBase}/text`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ text })
  })
  const data = await res.json()
  if (!data || !data.ok) throw new Error((data && data.error) || 'save_failed')
}

const resolveFileName = (file) => {
  const name = String(file && file.name || '').trim()
  if (name) return name
  const ext = file && file.type ? file.type.split('/')[1] : ''
  const suffix = ext ? `.${ext}` : ''
  return `clipboard-${Date.now()}${suffix}`
}

const uploadFile = async (file, groupId) => {
  if (!file) return
  const name = resolveFileName(file)
  const buf = await file.arrayBuffer()
  const groupPart = Number.isFinite(groupId) ? `&group_id=${encodeURIComponent(String(groupId))}` : ''
  const url = `${apiBase}/upload?filename=${encodeURIComponent(name)}&mime=${encodeURIComponent(file.type || 'application/octet-stream')}${groupPart}`
  const res = await fetch(url, {
    method: 'POST',
    headers: { 'Content-Type': 'application/octet-stream' },
    body: new Uint8Array(buf)
  })
  const data = await res.json()
  if (!data || !data.ok) throw new Error((data && data.error) || 'upload_failed')
}

const deleteItem = async (id) => {
  if (!id) return
  const res = await fetch(`${apiBase}/${id}`, { method: 'DELETE' })
  const data = await res.json()
  if (!data || !data.ok) throw new Error((data && data.error) || 'delete_failed')
  await fetchList()
}

const handlePaste = async (event) => {
  const data = event.clipboardData
  if (!data) return
  const items = Array.from(data.items || [])
  if (!items.length) return
  event.preventDefault()
  setStatus('正在保存...', '')
  setProgress(false)
  try {
    const files = items.filter(i => i.kind === 'file').map(i => i.getAsFile()).filter(Boolean)
    const strings = items.filter(i => i.kind === 'string')
    if (files.length) {
      const groupId = files.length > 1 ? createGroupId() : null
      setProgress(true, 0, files.length)
      let done = 0
      for (const f of files) {
        await uploadFile(f, groupId)
        done += 1
        setProgress(true, done, files.length)
      }
    }
    for (const s of strings) {
      await new Promise((resolve) => {
        s.getAsString(async (text) => {
          const v = String(text || '').trim()
          if (v) await saveText(v)
          resolve()
        })
      })
    }
    await fetchList()
    setProgress(false)
    setStatus('已保存到服务器', 'ok')
  } catch (e) {
    setProgress(false)
    setStatus('保存失败', 'error')
  }
}

const handleDrop = async (event) => {
  event.preventDefault()
  const zone = $('paste-zone')
  if (zone) zone.classList.remove('dragover')
  const files = Array.from(event.dataTransfer && event.dataTransfer.files || [])
  if (!files.length) return
  setStatus('正在上传...', '')
  const groupId = files.length > 1 ? createGroupId() : null
  setProgress(true, 0, files.length)
  try {
    let done = 0
    for (const f of files) {
      await uploadFile(f, groupId)
      done += 1
      setProgress(true, done, files.length)
    }
    await fetchList()
    setProgress(false)
    setStatus('已保存到服务器', 'ok')
  } catch (e) {
    setProgress(false)
    setStatus('上传失败', 'error')
  }
}

const bindDragEvents = () => {
  const zone = $('paste-zone')
  if (!zone) return
  zone.addEventListener('dragover', (event) => {
    event.preventDefault()
    zone.classList.add('dragover')
  })
  zone.addEventListener('dragleave', (event) => {
    if (event.target === zone) zone.classList.remove('dragover')
  })
  zone.addEventListener('drop', handleDrop)
}

const bindPasteInput = () => {
  const input = $('pc-paste-input')
  const btn = $('pc-paste-btn')
  if (!input) return
  const focusInput = () => {
    input.value = ''
    input.focus({ preventScroll: true })
    input.select()
  }
  if (btn) btn.addEventListener('click', focusInput)
  input.addEventListener('paste', handlePaste)
  const handleInput = async () => {
    const value = String(input.value || '').trim()
    if (!value) return
    input.value = ''
    setStatus('正在保存...', '')
    try {
      await saveText(value)
      await fetchList()
      setStatus('已保存到服务器', 'ok')
    } catch (e) {
      setStatus('保存失败', 'error')
    }
  }
  input.addEventListener('input', handleInput)
  input.addEventListener('change', handleInput)
}

const bindMobileInputs = () => {
  const textInput = $('pc-mobile-text')
  const textSave = $('pc-mobile-text-save')
  if (textInput && textSave) {
    textSave.addEventListener('click', async () => {
      const value = String(textInput.value || '').trim()
      if (!value) {
        setStatus('请输入文字', 'error')
        return
      }
      setStatus('正在保存...', '')
      try {
        await saveText(value)
        textInput.value = ''
        await fetchList()
        setStatus('已保存到服务器', 'ok')
      } catch (e) {
        setStatus('保存失败', 'error')
      }
    })
  }
  const uploadSelected = (inputEl, emptyText) => {
    if (!inputEl) return
    return async () => {
      const files = Array.from(inputEl.files || [])
      if (!files.length) {
        setStatus(emptyText, 'error')
        return
      }
      setStatus('正在上传...', '')
      setProgress(true, 0, files.length)
      const groupId = files.length > 1 ? createGroupId() : null
      try {
        let done = 0
        for (const f of files) {
          await uploadFile(f, groupId)
          done += 1
          setProgress(true, done, files.length)
        }
        inputEl.value = ''
        await fetchList()
        setProgress(false)
        setStatus('已保存到服务器', 'ok')
      } catch (e) {
        setProgress(false)
        setStatus('上传失败', 'error')
      }
    }
  }
  const imageInput = $('pc-mobile-image')
  const imageSave = $('pc-mobile-image-save')
  if (imageSave) imageSave.addEventListener('click', uploadSelected(imageInput, '请选择图片'))
  const fileInput = $('pc-mobile-file')
  const fileSave = $('pc-mobile-file-save')
  if (fileSave) fileSave.addEventListener('click', uploadSelected(fileInput, '请选择文件'))
}

const createFolder = async () => {
  const nameInput = $('pc-folder-name')
  const sortInput = $('pc-folder-sort')
  const name = String(nameInput && nameInput.value || '').trim()
  const sortOrder = Number.parseInt(String(sortInput && sortInput.value || ''), 10)
  if (!name) {
    setStatus('目录名称不能为空', 'error')
    return
  }
  await apiJson(`${apiBase}/folders`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      name,
      sort_order: Number.isFinite(sortOrder) && sortOrder > 0 ? sortOrder : undefined
    })
  })
  if (nameInput) nameInput.value = ''
  if (sortInput) sortInput.value = ''
  await Promise.all([fetchFolders(), fetchList()])
  setStatus('目录已创建', 'ok')
}

const init = async () => {
  clearUrlQuery()
  const isMobile = detectMobile()
  const refreshBtn = $('pc-refresh')
  if (refreshBtn) {
    refreshBtn.addEventListener('click', async () => {
      await Promise.all([fetchFolders(), fetchList()])
      setStatus('已刷新', 'ok')
    })
  }
  const viewAllBtn = $('pc-view-all')
  const viewFavoritesBtn = $('pc-view-favorites')
  const folderFilterSelect = $('pc-folder-select')
  const setView = (view) => {
    state.filter.view = view === 'favorites' ? 'favorites' : 'all'
    if (viewAllBtn) viewAllBtn.classList.toggle('active', state.filter.view === 'all')
    if (viewFavoritesBtn) viewFavoritesBtn.classList.toggle('active', state.filter.view === 'favorites')
    renderFolderFilters()
    renderList()
  }
  if (viewAllBtn) viewAllBtn.addEventListener('click', () => setView('all'))
  if (viewFavoritesBtn) viewFavoritesBtn.addEventListener('click', () => setView('favorites'))
  if (folderFilterSelect) {
    folderFilterSelect.addEventListener('change', () => {
      state.filter.folderCode = String(folderFilterSelect.value || 'all')
      renderList()
    })
  }
  const filterInput = $('pc-filter-input')
  if (filterInput) {
    filterInput.addEventListener('input', (event) => {
      state.filter.keyword = String(event.target.value || '')
      renderList()
    })
  }
  const clearBtn = $('pc-filter-clear')
  if (clearBtn) {
    clearBtn.addEventListener('click', () => {
      state.filter.keyword = ''
      if (filterInput) filterInput.value = ''
      renderList()
    })
  }
  const typeButtons = Array.from(document.querySelectorAll('.pc-filter-btn'))
  typeButtons.forEach(btn => {
    btn.addEventListener('click', () => {
      const type = String(btn.dataset.type || 'all')
      state.filter.type = type || 'all'
      typeButtons.forEach(b => b.classList.toggle('active', b === btn))
      renderList()
    })
  })
  if (typeButtons.length) typeButtons[0].classList.add('active')
  const manageFoldersBtn = $('pc-manage-folders')
  if (manageFoldersBtn) manageFoldersBtn.addEventListener('click', openFolderModal)
  const folderCreateBtn = $('pc-folder-create')
  if (folderCreateBtn) {
    folderCreateBtn.addEventListener('click', async () => {
      try {
        await createFolder()
      } catch (e) {
        setStatus(`目录创建失败: ${normalizeError(e)}`, 'error')
      }
    })
  }
  const folderCloseBtn = $('pc-folder-close')
  if (folderCloseBtn) folderCloseBtn.addEventListener('click', closeFolderModal)
  const favoriteCloseBtn = $('pc-favorite-close')
  if (favoriteCloseBtn) favoriteCloseBtn.addEventListener('click', closeFavoriteModal)
  const favoriteGoManageBtn = $('pc-favorite-go-manage')
  if (favoriteGoManageBtn) {
    favoriteGoManageBtn.addEventListener('click', () => {
      closeFavoriteModal()
      openFolderModal()
    })
  }
  const favoriteConfirmBtn = $('pc-favorite-confirm')
  if (favoriteConfirmBtn) {
    favoriteConfirmBtn.addEventListener('click', async () => {
      const id = state.favoriteDraft.id
      const select = $('pc-favorite-folder-select')
      const folderCode = String(select && select.value || '').trim()
      if (!id || !folderCode) {
        setStatus('请选择收藏目录', 'error')
        return
      }
      try {
        await favoriteItem(id, folderCode)
        closeFavoriteModal()
        setStatus(`已收藏到 ${folderDisplayName(folderCode)}`, 'ok')
      } catch (e) {
        setStatus(`收藏失败: ${normalizeError(e)}`, 'error')
      }
    })
  }
  document.querySelectorAll('.pc-modal-backdrop').forEach(el => {
    el.addEventListener('click', () => {
      const closeType = String(el.getAttribute('data-close') || '')
      if (closeType === 'favorite') closeFavoriteModal()
      if (closeType === 'folder') closeFolderModal()
    })
  })
  if (!isMobile) {
    const zone = $('paste-zone')
    if (zone) zone.addEventListener('click', () => zone.focus())
    document.addEventListener('paste', handlePaste)
    bindDragEvents()
    bindPasteInput()
  } else {
    bindMobileInputs()
  }
  const viewerClose = $('pc-viewer-close')
  if (viewerClose) viewerClose.addEventListener('click', closeViewer)
  const viewerPrev = $('pc-viewer-prev')
  if (viewerPrev) viewerPrev.addEventListener('click', () => stepViewer(-1))
  const viewerNext = $('pc-viewer-next')
  if (viewerNext) viewerNext.addEventListener('click', () => stepViewer(1))
  const viewerBackdrop = $('pc-viewer-backdrop')
  if (viewerBackdrop) viewerBackdrop.addEventListener('click', closeViewer)

  const viewerCopyUrl = $('pc-viewer-copy-url')
  if (viewerCopyUrl) {
    viewerCopyUrl.addEventListener('click', () => {
      const current = state.viewer.images[state.viewer.index]
      if (current) {
        const url = new URL(current.url, window.location.origin).href
        copyTextToClipboard(url)
      }
    })
  }

  const viewerCopyImg = $('pc-viewer-copy-img')
  if (viewerCopyImg) {
    viewerCopyImg.addEventListener('click', () => {
      const current = state.viewer.images[state.viewer.index]
      if (current) {
        const url = new URL(current.url, window.location.origin).href
        copyImageToClipboard(url)
      }
    })
  }

  document.addEventListener('keydown', (event) => {
    const viewer = $('pc-viewer')
    const favoriteModal = $('pc-favorite-modal')
    const folderModal = $('pc-folder-modal')
    if (event.key === 'Escape') {
      if (favoriteModal && favoriteModal.classList.contains('show')) closeFavoriteModal()
      if (folderModal && folderModal.classList.contains('show')) closeFolderModal()
      if (viewer && viewer.classList.contains('show')) closeViewer()
      return
    }
    if (!viewer || !viewer.classList.contains('show')) return
    if (event.key === 'ArrowLeft') stepViewer(-1)
    if (event.key === 'ArrowRight') stepViewer(1)
  })
  await Promise.all([fetchFolders(), fetchList()])
  setView('all')
}

init()