import { Link, useNavigate } from 'react-router'
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
import { Pencil, Plus, Trash2 } from 'lucide-react'
import { useState } from 'react'
import { api } from '../lib/api'
import type { NoteItem } from '../lib/api'
import { invalidatePublic } from '../lib/invalidate'
import { useAuth } from '../lib/auth'
import { formatDateTime } from '../lib/utils'

function useAdminNotes() {
  return useQuery({
    queryKey: ['admin', 'notes'],
    queryFn: () => api<{ items: NoteItem[]; total: number }>('/api/admin/notes'),
  })
}

export default function AdminList() {
  const { data, isLoading } = useAdminNotes()
  const { logout } = useAuth()
  const navigate = useNavigate()
  const qc = useQueryClient()
  const [confirmId, setConfirmId] = useState<number | null>(null)

  const trashMutation = useMutation({
    mutationFn: (id: number) => api(`/api/admin/notes/${id}`, { method: 'DELETE' }),
    onSuccess: () => {
      setConfirmId(null)
      void qc.invalidateQueries({ queryKey: ['admin'] })
      invalidatePublic(qc)
    },
  })

  const toggleStatus = useMutation({
    mutationFn: async (note: NoteItem) => {
      // 状态切换：读全文 → 翻转 status → PUT
      const full = await api<NoteItem & { content: string }>(`/api/admin/notes/${note.id}`)
      return api(`/api/admin/notes/${note.id}`, {
        method: 'PUT',
        body: JSON.stringify({
          title: full.title,
          slug: full.slug,
          summary: full.summary,
          content: full.content,
          status: full.status === 'public' ? 'private' : 'public',
          tags: full.tags,
          pinned: full.pinned,
        }),
      })
    },
    onSuccess: () => {
      void qc.invalidateQueries({ queryKey: ['admin'] })
      invalidatePublic(qc)
    },
  })

  return (
    <div>
      <div className="mb-4 flex items-center justify-between">
        <h1 className="text-lg font-semibold">笔记管理（{data?.total ?? 0}）</h1>
        <div className="flex gap-2">
          <Link
            to="/admin/notes/new"
            className="inline-flex items-center gap-1 rounded-lg bg-zinc-900 px-3 py-1.5 text-sm font-medium text-white hover:bg-zinc-800 dark:bg-zinc-100 dark:text-zinc-900 dark:hover:bg-zinc-200"
          >
            <Plus size={15} /> 新建
          </Link>
          <button
            type="button"
            onClick={() => void logout().then(() => navigate('/'))}
            className="rounded-lg border border-zinc-300 px-3 py-1.5 text-sm text-zinc-600 hover:bg-zinc-50 dark:border-zinc-700 dark:text-zinc-400 dark:hover:bg-zinc-800"
          >
            登出
          </button>
        </div>
      </div>

      {isLoading ? (
        <p className="py-12 text-center text-zinc-400">加载中…</p>
      ) : !data || data.items.length === 0 ? (
        <p className="py-12 text-center text-zinc-400">还没有笔记，点击「新建」开始</p>
      ) : (
        <ul className="divide-y divide-zinc-100 rounded-lg border border-zinc-200 dark:divide-zinc-900 dark:border-zinc-800">
          {data.items.map((n) => (
            <li key={n.id} className="flex items-center gap-3 px-4 py-3">
              <span
                className={`rounded px-1.5 py-0.5 text-xs ${
                  n.status === 'public'
                    ? 'bg-green-100 text-green-700 dark:bg-green-900/40 dark:text-green-400'
                    : 'bg-zinc-100 text-zinc-500 dark:bg-zinc-800 dark:text-zinc-400'
                }`}
              >
                {n.status === 'public' ? '公开' : '私有'}
              </span>
              {n.pinned && <span className="text-xs text-amber-600">置顶</span>}
              <div className="min-w-0 flex-1">
                <Link to={`/admin/notes/${n.id}/edit`} className="block truncate font-medium hover:text-blue-600">
                  {n.title}
                </Link>
                <p className="truncate text-xs text-zinc-400">
                  /{n.slug} · {formatDateTime(n.updated_at)}
                  {n.tags.length > 0 && ' · ' + n.tags.map((t) => '#' + t).join(' ')}
                </p>
              </div>
              <button
                type="button"
                onClick={() => void toggleStatus.mutate(n)}
                disabled={toggleStatus.isPending}
                className="rounded px-2 py-1 text-xs text-zinc-500 hover:bg-zinc-100 disabled:opacity-50 dark:hover:bg-zinc-800"
              >
                {n.status === 'public' ? '转私有' : '转公开'}
              </button>
              <Link
                to={`/admin/notes/${n.id}/edit`}
                className="rounded p-1.5 text-zinc-500 hover:bg-zinc-100 dark:hover:bg-zinc-800"
                title="编辑"
              >
                <Pencil size={15} />
              </Link>
              <button
                type="button"
                onClick={() => setConfirmId(n.id)}
                className="rounded p-1.5 text-red-500 hover:bg-red-50 dark:hover:bg-red-950"
                title="删除（进回收站）"
              >
                <Trash2 size={15} />
              </button>
              {confirmId === n.id && (
                <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/40 px-4">
                  <div className="w-full max-w-sm rounded-xl bg-white p-6 dark:bg-zinc-900">
                    <h3 className="font-semibold">移入回收站？</h3>
                    <p className="mt-1 text-sm text-zinc-500">
                      「{n.title}」将被软删除，30 天内可在回收站恢复。
                    </p>
                    {trashMutation.isError && (
                      <p className="mt-2 text-sm text-red-600">操作失败，请重试</p>
                    )}
                    <div className="mt-4 flex justify-end gap-2">
                      <button
                        type="button"
                        onClick={() => setConfirmId(null)}
                        className="rounded-lg border border-zinc-300 px-3 py-1.5 text-sm dark:border-zinc-700"
                      >
                        取消
                      </button>
                      <button
                        type="button"
                        onClick={() => trashMutation.mutate(n.id)}
                        disabled={trashMutation.isPending}
                        className="rounded-lg bg-red-600 px-3 py-1.5 text-sm text-white hover:bg-red-700 disabled:opacity-50"
                      >
                        {trashMutation.isPending ? '删除中…' : '确认删除'}
                      </button>
                    </div>
                  </div>
                </div>
              )}
            </li>
          ))}
        </ul>
      )}
    </div>
  )
}