import { useCallback, useEffect, useState, type ReactNode } from 'react'
import {
  Download,
  Trash2,
  RefreshCw,
  CheckCircle2,
  XCircle,
  ToggleLeft,
  ToggleRight,
  Loader2,
  AlertCircle,
  X,
} from 'lucide-react'
import { getImages, downloadImage, cancelImageDownload, deleteImage, toggleImage, ImageInfo } from '../services/api'
import { useDialog } from '../components/Dialog'

export default function ImageManagement() {
  const dialog = useDialog()
  const [images, setImages] = useState<ImageInfo[]>([])
  const [loading, setLoading] = useState(true)
  const [actionLoading, setActionLoading] = useState<string | null>(null)
  const [error, setError] = useState('')

  const fetchImages = useCallback(async () => {
    try {
      const res = await getImages()
      setImages(res.data.data || [])
      setError('')
    } catch {
      setError('获取镜像列表失败')
    } finally {
      setLoading(false)
    }
  }, [])

  useEffect(() => {
    fetchImages()
  }, [fetchImages])

  useEffect(() => {
    const hasDownloads = images.some((img) => img.downloading)
    const interval = setInterval(fetchImages, hasDownloads ? 1500 : 5000)
    return () => clearInterval(interval)
  }, [fetchImages, images])

  const handleDownload = async (templateId: string) => {
    setActionLoading(templateId)
    setError('')
    try {
      await downloadImage(templateId)
      await fetchImages()
    } catch (err: unknown) {
      setError(apiErrorMessage(err, '下载失败'))
    } finally {
      setActionLoading(null)
    }
  }

  const handleCancelDownload = async (templateId: string) => {
    setActionLoading(templateId)
    setError('')
    try {
      await cancelImageDownload(templateId)
      await fetchImages()
    } catch (err: unknown) {
      setError(apiErrorMessage(err, '取消失败'))
    } finally {
      setActionLoading(null)
    }
  }

  const handleDelete = async (templateId: string) => {
    if (!(await dialog.confirm('删除镜像', '确定要删除该镜像缓存吗？删除后需要重新下载才能使用。'))) return
    setActionLoading(templateId)
    setError('')
    try {
      await deleteImage(templateId)
      await fetchImages()
    } catch (err: unknown) {
      const msg = err instanceof Error ? err.message : '删除失败'
      setError(msg)
    } finally {
      setActionLoading(null)
    }
  }

  const handleToggle = async (templateId: string, enabled: boolean) => {
    setActionLoading(templateId)
    setError('')
    try {
      await toggleImage(templateId, !enabled)
      await fetchImages()
    } catch (err: unknown) {
      const msg = err instanceof Error ? err.message : '操作失败'
      setError(msg)
    } finally {
      setActionLoading(null)
    }
  }

  const downloadedCount = images.filter((img) => img.downloaded).length
  const lxcImages = images.filter((img) => img.type === 'lxc')
  const kvmImages = images.filter((img) => img.type === 'kvm')

  if (loading) {
    return (
      <div className="flex items-center justify-center py-20">
        <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-black"></div>
      </div>
    )
  }

  return (
    <div className="space-y-6">
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-2xl font-bold text-black">镜像管理</h1>
          <p className="text-sm text-gray-500 mt-1">
            管理 LXC / KVM 系统镜像，下载后的镜像才能用于创建容器/虚拟机。
            已下载 {downloadedCount}/{images.length}
          </p>
        </div>
        <button
          onClick={fetchImages}
          className="flex items-center gap-1.5 px-3 py-1.5 border border-gray-300 text-gray-700 rounded-md hover:bg-gray-50 transition-colors text-xs font-medium"
        >
          <RefreshCw className="w-3.5 h-3.5" />
          刷新
        </button>
      </div>

      {error && (
        <div className="flex items-center gap-2 bg-red-50 border border-red-200 rounded-lg px-4 py-3 text-sm text-red-700">
          <AlertCircle className="w-4 h-4 flex-shrink-0" />
          {error}
        </div>
      )}

      <ImageTable
        title="LXC 容器镜像"
        images={lxcImages}
        actionLoading={actionLoading}
        downloadedCount={lxcImages.filter((img) => img.downloaded).length}
        totalCount={lxcImages.length}
        onDownload={handleDownload}
        onCancelDownload={handleCancelDownload}
        onDelete={handleDelete}
        onToggle={handleToggle}
      />

      {kvmImages.length > 0 && (
        <ImageTable
          title="KVM 虚拟机镜像"
          images={kvmImages}
          actionLoading={actionLoading}
          downloadedCount={kvmImages.filter((img) => img.downloaded).length}
          totalCount={kvmImages.length}
          onDownload={handleDownload}
          onCancelDownload={handleCancelDownload}
          onDelete={handleDelete}
          onToggle={handleToggle}
        />
      )}
    </div>
  )
}

function ImageTable({
  title,
  images,
  actionLoading,
  downloadedCount,
  totalCount,
  onDownload,
  onCancelDownload,
  onDelete,
  onToggle,
}: {
  title: string
  images: ImageInfo[]
  actionLoading: string | null
  downloadedCount: number
  totalCount: number
  onDownload: (id: string) => void
  onCancelDownload: (id: string) => void
  onDelete: (id: string) => void
  onToggle: (id: string, enabled: boolean) => void
}) {
  return (
    <div className="space-y-3">
      <div className="flex items-center gap-3">
        <h2 className="text-lg font-semibold text-gray-800">{title}</h2>
        <span className="text-xs text-gray-400">
          已下载 {downloadedCount}/{totalCount}
        </span>
      </div>
      <div className="bg-white border border-gray-200 rounded-lg overflow-hidden">
        <div className="overflow-x-auto">
          <table className="w-full">
            <thead>
              <tr className="border-b border-gray-200 bg-gray-50">
                <th className="text-left px-4 py-3 text-[11px] font-medium text-gray-500 uppercase whitespace-nowrap">
                  系统镜像
                </th>
                <th className="text-left px-4 py-3 text-[11px] font-medium text-gray-500 uppercase whitespace-nowrap">
                  发行版
                </th>
                <th className="text-left px-4 py-3 text-[11px] font-medium text-gray-500 uppercase whitespace-nowrap">
                  架构
                </th>
                <th className="text-left px-4 py-3 text-[11px] font-medium text-gray-500 uppercase whitespace-nowrap">
                  大小
                </th>
                <th className="text-left px-4 py-3 text-[11px] font-medium text-gray-500 uppercase whitespace-nowrap">
                  状态
                </th>
                <th className="text-right px-4 py-3 text-[11px] font-medium text-gray-500 uppercase whitespace-nowrap">
                  操作
                </th>
              </tr>
            </thead>
            <tbody className="divide-y divide-gray-100">
              {images.map((img) => {
                const isBusy = actionLoading === img.id
                return (
                  <tr key={img.id} className="hover:bg-gray-50 transition-colors">
                    <td className="px-4 py-3">
                      <div className="flex items-center gap-3">
                        <span className="w-8 h-8 flex items-center justify-center flex-shrink-0">
                          {getTemplateIcon(img.id)}
                        </span>
                        <div>
                          <span className="font-medium text-gray-900 text-sm">{img.name}</span>
                          <p className="text-[11px] text-gray-400">{img.description}</p>

                        </div>
                      </div>
                    </td>
                    <td className="px-4 py-3 text-xs text-gray-600 font-mono">
                      {img.distro} {img.release}
                    </td>
                    <td className="px-4 py-3 text-xs text-gray-500 font-mono">
                      {img.arch}
                    </td>
                    <td className="px-4 py-3 text-xs text-gray-600 tabular-nums">
                      {formatSize(img.size_bytes)}
                    </td>
                    <td className="px-4 py-3">
                      <StatusBadge img={img} />
                    </td>
                    <td className="px-4 py-3">
                      <div className="flex items-center justify-end gap-2">
                        {!img.downloaded && !img.downloading && (
                          <button
                            onClick={() => onDownload(img.id)}
                            disabled={isBusy}
                            className="inline-flex items-center gap-1.5 px-3 py-1.5 bg-black text-white rounded-md hover:bg-gray-800 transition-colors text-xs font-medium disabled:opacity-50"
                          >
                            {isBusy ? (
                              <Loader2 className="w-3.5 h-3.5 animate-spin" />
                            ) : (
                              <Download className="w-3.5 h-3.5" />
                            )}
                            {isBusy ? '下载中...' : '下载'}
                          </button>
                        )}

                        {img.downloading && (
                          <button
                            onClick={() => onCancelDownload(img.id)}
                            disabled={isBusy}
                            className="inline-flex items-center gap-1.5 px-3 py-1.5 rounded-md border border-red-200 text-red-600 hover:bg-red-50 transition-colors text-xs font-medium disabled:opacity-50"
                            title="取消下载并清理临时文件"
                          >
                            {isBusy ? <Loader2 className="w-3.5 h-3.5 animate-spin" /> : <X className="w-3.5 h-3.5" />}
                            {isBusy ? '取消中...' : '取消'}
                          </button>
                        )}

                        {img.downloaded && !img.downloading && (
                          <>
                            <button
                              onClick={() => onToggle(img.id, img.enabled)}
                              disabled={isBusy}
                              className={`inline-flex items-center gap-1 px-2.5 py-1.5 rounded-md text-xs font-medium transition-colors disabled:opacity-50 ${
                                img.enabled
                                  ? 'bg-emerald-50 text-emerald-700 border border-emerald-200 hover:bg-emerald-100'
                                  : 'bg-gray-50 text-gray-500 border border-gray-200 hover:bg-gray-100'
                              }`}
                            >
                              {img.enabled ? <ToggleRight className="w-3.5 h-3.5" /> : <ToggleLeft className="w-3.5 h-3.5" />}
                              {img.enabled ? '启用' : '禁用'}
                            </button>
                            <button
                              onClick={() => onDelete(img.id)}
                              disabled={isBusy}
                              className="inline-flex items-center gap-1 px-2.5 py-1.5 rounded-md border border-red-200 text-red-600 hover:bg-red-50 transition-colors text-xs font-medium disabled:opacity-50"
                              title="删除镜像缓存"
                            >
                              <Trash2 className="w-3.5 h-3.5" />
                            </button>
                          </>
                        )}
                      </div>
                    </td>
                  </tr>
                )
              })}
            </tbody>
          </table>
        </div>
      </div>
    </div>
  )
}

function StatusBadge({ img }: { img: ImageInfo }) {
  if (img.downloading) {
    const progress = Math.max(0, Math.min(100, img.progress || 0))
    const showProgress = img.stage === 'downloading' && progress > 0
    return (
      <div className="inline-flex flex-col gap-1">
        <span
          className="inline-flex items-center gap-1 px-2 py-0.5 rounded-full text-[11px] font-medium bg-amber-50 text-amber-700"
          title={downloadStatusTitle(img)}
        >
          <span className="w-1.5 h-1.5 rounded-full bg-amber-500 animate-pulse" />
          {downloadStatusLabel(img)}
        </span>
        {showProgress && (
          <span className="block h-1 w-24 overflow-hidden rounded-full bg-amber-100">
            <span className="block h-full rounded-full bg-amber-500 transition-all" style={{ width: `${progress}%` }} />
          </span>
        )}
      </div>
    )
  }
  if (img.error) {
    return (
      <span
        className="inline-flex items-center gap-1 px-2 py-0.5 rounded-full text-[11px] font-medium bg-red-50 text-red-600"
        title={img.error}
      >
        <AlertCircle className="w-3 h-3" />
        下载失败
      </span>
    )
  }
  if (img.downloaded && img.enabled) {
    return (
      <span className="inline-flex items-center gap-1 px-2 py-0.5 rounded-full text-[11px] font-medium bg-emerald-50 text-emerald-700">
        <CheckCircle2 className="w-3 h-3" />
        可用
      </span>
    )
  }
  if (img.downloaded && !img.enabled) {
    return (
      <span className="inline-flex items-center gap-1 px-2 py-0.5 rounded-full text-[11px] font-medium bg-gray-100 text-gray-500">
        <XCircle className="w-3 h-3" />
        已禁用
      </span>
    )
  }
  return (
    <span className="inline-flex items-center gap-1 px-2 py-0.5 rounded-full text-[11px] font-medium bg-red-50 text-red-600">
      <XCircle className="w-3 h-3" />
      未下载
    </span>
  )
}

function downloadStatusLabel(img: ImageInfo) {
  if (img.stage === 'canceling') return '取消中'
  if (img.stage === 'converting') return '转换中'
  if (img.stage === 'lxc-create') return '下载中'
  if (img.progress > 0) return `下载中 ${Math.min(100, img.progress)}%`
  return '下载中'
}

function downloadStatusTitle(img: ImageInfo) {
  const parts = [downloadStatusLabel(img)]
  if (img.stage) parts.push(`阶段：${img.stage}`)
  if (img.downloaded_bytes > 0 || img.total_bytes > 0) {
    parts.push(`${formatSize(img.downloaded_bytes)} / ${formatSize(img.total_bytes)}`)
  }
  return parts.join('，')
}

function isWindowsImage(img: ImageInfo) {
  return img.distro === 'windows' || img.id.toLowerCase().includes('windows')
}

function getTemplateIcon(id: string): ReactNode {
  const size = 'w-5 h-5'
  id = id.startsWith('kvm-') ? id.slice(4) : id
  if (id.startsWith('debian')) return <svg className={size} viewBox="0 0 1024 1024"><path d="M935.473 375.359a558.602 558.602 0 0 0-22.351-114.655l13.308 4.436c-35.66-81.385-90.086-163.623-153.556-199.282-8.701-5.118-35.147 4.948-26.616-12.113s-37.536-8.19-56.816-4.778c-26.275 4.266-30.028-29.175-75.071-35.83-25.593-3.582-32.247 18.427-44.702 13.309-23.545-9.384-20.816-27.64-57.669-9.384-18.427 9.042 11.602-26.105-49.138-4.607L457.744 0C349.23 41.63 318.69 76.266 288.15 79.337c-6.996 0-34.124 32.759-53.574 53.062-17.062 17.062-26.275 36.512-49.138 39.583l-17.062 70.636A136.494 136.494 0 0 0 119.41 339.7a66.711 66.711 0 0 1 4.436-52.892c-17.062 6.825-45.896 17.062-29.687 96.91 12.796 63.13-5.29 135.13 10.066 204.742 4.777 20.986 0 40.095 6.142 51.185 107.66 235.794 208.836 392.08 472.44 384.06l4.436-8.872c-28.152-6.825-55.11-17.062-111.584-30.711-18.597-4.436-23.033-34.124-40.265-44.19-9.384-5.46-28.323-4.095-37.195-9.896s4.266-21.668-19.962-14.332c-8.531 2.56-13.82-10.92-20.133-17.061s0-23.716-23.375-24.74-18.426-29.687-19.791-44.702c-12.114 1.536-1.195-1.535-13.308 4.436a63.64 63.64 0 0 1-23.887-31.735c-10.237-48.967-10.578-21.497-15.014-32.417a322.297 322.297 0 0 0-19.28-42.142l26.787 8.872h4.436l4.436-13.309-26.616-8.701h31.223c-7.678 13.99 2.047 5.29-13.479 8.872v13.308l22.35-8.872v-13.308c-20.644-10.237-28.663-13.308-49.137-22.01l9.043 8.872v4.436h-49.138c-22.01-14.843-13.99-31.734-17.915-53.062 17.062 0 9.213 6.655 17.062-13.137l-17.062 8.872 13.308-33.953-13.308 13.138c-29.176-38.73-16.209-97.764-11.943-152.02A180.684 180.684 0 0 1 211.2 372.97c8.872-10.067 5.119-25.251 5.46-37.195l31.223-26.445H265.8c7.678 17.061 4.777 5.46 0 22.01l8.872 4.435c7.166-8.701 6.142-5.971 8.872-22.01-10.066-10.578-6.995-9.895-26.616-13.308A119.432 119.432 0 0 1 368.51 243.13l4.436-13.308-17.915 9.043-4.436-13.138a109.536 109.536 0 0 1 76.095-27.128c6.313 0 6.996-17.062 12.797-19.45 161.574-60.57 309.33 9.383 371.093 147.413a324.173 324.173 0 0 1 8.19 34.123c17.061 56.987-7.167 121.48 9.725 155.604-7.849 36-36.683 13.82-40.266 30.881-8.531 41.29-14.844 59.717-40.778 78.826a196.38 196.38 0 0 1-30.711 22.35 84.285 84.285 0 0 0 22.35-39.753c-106.294 111.584-262.58 63.981-290.049-105.954a101.176 101.176 0 0 1 35.147-93.157c92.987-87.527 150.144-52.38 205.765-20.474l-8.872-30.711c-32.93-24.398-17.062-19.792-9.043-57.328v-4.436l-17.915-13.137c2.56 10.066 1.024 5.289 9.043 17.061-4.436 16.039 0 9.043-8.872 17.062-15.014 9.725-23.716 7.337-44.702 4.436l4.436-13.308-13.308-13.308c0 11.773-4.095 2.73 0 17.062-126.086 9.896-218.05 80.02-178.636 260.191a220.608 220.608 0 0 0 8.872 44.19l-8.872 8.702-4.436-26.446h-13.48l-4.435 13.308c-12.626-25.763-0.853 10.75 40.265 52.892a149.29 149.29 0 0 0 12.797 12.625c47.773 34.124 113.29 81.385 201.328 49.138h9.043v-4.436l-102.37-13.308-4.436-8.701c106.806 24.74 176.93-8.531 236.646-48.456 13.138-17.062 11.431-24.057 22.18-9.043 19.28-17.061 3.925-26.786 13.48-44.019 6.483-11.772 32.587-17.062 44.7-35.318l40.096-136.494h-17.062c3.071-14.332 22.522-34.123-4.436-48.455-2.559-1.536 9.043-1.365 8.872-4.266a145.537 145.537 0 0 0-22.18-66.37c33.1 21.669 36.342 68.247 53.574 105.783v8.872h4.436V375.36zM453.308 595.455l-9.555-26.446 62.446 57.328zM146.196 211.736l-23.204-4.436v39.754c16.72-10.578 18.939-10.407 22.35-35.318z m574.981 176.419a57.498 57.498 0 0 0-17.062 44.19l13.48 8.701a37.877 37.877 0 0 0 4.435-52.891zM868.42 555.872c26.275-11.602 54.598-58.01 35.83-97.081l-35.83 96.91z m-174.03-79.508c-15.697 11.773-19.791 13.308-22.35 39.754l13.307 8.872 17.915-8.872a60.228 60.228 0 0 0 4.436-48.455c-8.36 13.478-2.559 20.644-13.308 8.701z m-67.053 79.508c15.868-10.92 11.944-14.844 17.915-22.18v-4.778a292.097 292.097 0 0 1-62.446 0c-13.137-13.99-13.308-29.346-31.223-39.583 17.062 35.147 3.242 38.218 31.223 61.764a158.162 158.162 0 0 0 40.095 4.436c1.536 0-6.824-1.024 4.436 0zM207.79 520.554H194.31l-8.872 8.702c9.555 10.237 5.46 7.166 13.308-4.436L212.225 547l4.436-17.062-8.872-8.701z m17.062 57.328l4.436-8.873c-10.067-8.701 0-3.583-13.308 0l-13.309-17.061 4.436 17.061v8.873h17.062z" fill="#CE0C48"/></svg>
  if (id.startsWith('ubuntu')) return <svg className={size} viewBox="0 0 1024 1024"><circle cx="512" cy="512" r="511" fill="#DD4814"/><path d="M164.532 442.532c-37.676 0-68.2 30.524-68.2 68.2 0 37.656 30.524 68.184 68.2 68.184 37.66 0 68.184-30.528 68.184-68.184 0-37.676-30.524-68.2-68.184-68.2z m486.86 309.912c-32.612 18.84-43.8 60.52-24.96 93.116 18.82 32.616 60.5 43.796 93.116 24.96 32.612-18.82 43.796-60.5 24.96-93.12-18.82-32.592-60.524-43.772-93.116-24.956z m-338.744-241.712c0-67.384 33.472-126.92 84.684-162.968L347.48 264.268c-59.656 39.88-104.048 100.816-122.496 172.188 21.528 17.56 35.304 44.3 35.304 74.272 0 29.956-13.776 56.696-35.304 74.26C243.408 656.376 287.8 717.32 347.48 757.2l49.852-83.52c-51.212-36.028-84.684-95.56-84.684-162.948z m199.168-199.188c104.052 0 189.42 79.776 198.38 181.52l97.16-1.432c-4.776-75.112-37.592-142.544-88.008-192.128-25.928 9.796-55.88 8.296-81.76-6.624-25.932-14.964-42.192-40.208-46.636-67.608a297.04 297.04 0 0 0-79.14-10.76 295.148 295.148 0 0 0-131.276 30.652l47.38 84.908a198.384 198.384 0 0 1 83.9-18.528z m0 398.36a198.404 198.404 0 0 1-83.896-18.528l-47.38 84.9a294.848 294.848 0 0 0 131.28 30.684 296.16 296.16 0 0 0 79.136-10.788c4.444-27.4 20.708-52.62 46.632-67.608 25.904-14.948 55.836-16.42 81.76-6.624 50.42-49.584 83.232-117.016 88.016-192.128l-97.188-1.432c-8.94 101.772-94.304 181.52-198.36 181.52z m139.552-440.924c32.616 18.832 74.3 7.68 93.116-24.936 18.84-32.616 7.68-74.3-24.936-93.14-32.616-18.816-74.296-7.64-93.14 24.976-18.812 32.6-7.632 74.28 24.96 93.1z" fill="#FFF"/></svg>
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  if (id.startsWith('rockylinux')) return <svg className={size} viewBox="0 0 1024 1024"><path d="M995.498667 680.362667c18.474667-52.778667 28.501333-109.568 28.501333-168.704C1024 229.077333 794.752 0 512 0S0 229.077333 0 511.658667c0 139.818667 56.106667 266.496 147.114667 358.826666L666.453333 351.530667l128.213334 128.170666 200.832 200.704z m-93.525334 162.816l-235.52-235.349334-368.896 368.597334A510.506667 510.506667 0 0 0 512 1023.274667c156.16 0 296.106667-69.888 389.973333-180.053334h0.042667z" fill="#10B981"/></svg>
  if (id.startsWith('windows')) return <svg className={size} viewBox="0 0 1024 1024"><path d="M56.888889 227.555556l398.222222-70.542223V512H56.888889V227.555556z m0 625.777777l398.222222 70.542223V568.888889H56.888889v284.444444zM512 147.342222L1024 56.888889v455.111111H512V147.342222z m0 786.204445L1024 1024v-455.111111H512v364.657778z" fill="#16C6FE"/></svg>
  return null
}

function apiErrorMessage(err: unknown, fallback: string) {
  const error = err as { response?: { data?: { message?: string } }; message?: string }
  return error.response?.data?.message || error.message || fallback
}

function formatSize(bytes: number): string {
  if (bytes <= 0) return '-'
  if (bytes < 1024) return `${bytes} B`
  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`
  if (bytes < 1024 * 1024 * 1024) return `${(bytes / (1024 * 1024)).toFixed(1)} MB`
  return `${(bytes / (1024 * 1024 * 1024)).toFixed(2)} GB`
}