import { useEffect, useState } from 'react'
import { apiRequest, updateFtpPassword } from '../api/client'
import { Plus, Trash2, Key } from 'lucide-react'

interface FtpAccount {
  id: number
  name: string
  path: string
  ps: string
}

export function FtpPage() {
  const [accounts, setAccounts] = useState<FtpAccount[]>([])
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState('')
  const [showCreate, setShowCreate] = useState(false)
  const [creating, setCreating] = useState(false)
  const [creatingError, setCreatingError] = useState('')
  const [changePwId, setChangePwId] = useState<number | null>(null)
  const [pwError, setPwError] = useState('')

  const loadAccounts = () => {
    setLoading(true)
    apiRequest<FtpAccount[]>('/ftp/list')
      .then(setAccounts)
      .catch((err) => setError(err.message))
      .finally(() => setLoading(false))
  }

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

  const handleCreate = (e: React.FormEvent<HTMLFormElement>) => {
    e.preventDefault()
    const form = e.currentTarget
    const name = (form.elements.namedItem('name') as HTMLInputElement).value.trim()
    const password = (form.elements.namedItem('password') as HTMLInputElement).value
    const path = (form.elements.namedItem('path') as HTMLInputElement).value.trim()
    const ps = (form.elements.namedItem('ps') as HTMLInputElement).value.trim()

    if (!name || !password || !path) {
      setCreatingError('Name, password and path are required')
      return
    }
    setCreating(true)
    setCreatingError('')
    apiRequest<{ status: boolean; msg: string }>('/ftp/create', {
      method: 'POST',
      body: JSON.stringify({ name, password, path, ps }),
    })
      .then(() => {
        setShowCreate(false)
        form.reset()
        loadAccounts()
      })
      .catch((err) => setCreatingError(err.message))
      .finally(() => setCreating(false))
  }

  const handleChangePassword = (e: React.FormEvent, id: number) => {
    e.preventDefault()
    const form = e.currentTarget
    const password = (form.elements.namedItem('new_password') as HTMLInputElement).value
    const confirm = (form.elements.namedItem('confirm_password') as HTMLInputElement).value
    if (!password || password.length < 6) {
      setPwError('Password must be at least 6 characters')
      return
    }
    if (password !== confirm) {
      setPwError('Passwords do not match')
      return
    }
    setPwError('')
    updateFtpPassword(id, password)
      .then(() => setChangePwId(null))
      .catch((err) => setPwError(err.message))
  }

  const handleDelete = (id: number, name: string) => {
    if (!confirm(`Delete FTP account "${name}"?`)) return
    apiRequest<{ status: boolean }>(`/ftp/${id}`, { method: 'DELETE' })
      .then(loadAccounts)
      .catch((err) => setError(err.message))
  }

  if (loading) return <div className="text-gray-500">Loading...</div>
  if (error) return <div className="p-4 rounded bg-red-100 text-red-700">{error}</div>

  return (
    <div>
      <div className="flex justify-between items-center mb-4">
        <h1 className="text-2xl font-bold text-gray-800 dark:text-white">FTP</h1>
        <button
          onClick={() => setShowCreate(true)}
          className="flex items-center gap-2 px-4 py-2 bg-blue-600 hover:bg-blue-700 text-white rounded-lg font-medium"
        >
          <Plus className="w-4 h-4" />
          Add FTP
        </button>
      </div>

      <div className="mb-4 p-3 rounded-lg bg-gray-100 dark:bg-gray-700/50 text-sm text-gray-600 dark:text-gray-400">
        FTP accounts use Pure-FTPd (pure-pw). Path must be under www root. Install: <code className="font-mono">apt install pure-ftpd pure-ftpd-common</code>
      </div>

      {showCreate && (
        <div className="fixed inset-0 bg-black/50 flex items-center justify-center z-50">
          <div className="bg-white dark:bg-gray-800 rounded-lg shadow-xl p-6 w-full max-w-md">
            <h2 className="text-xl font-bold mb-4 text-gray-800 dark:text-white">Create FTP Account</h2>
            <form onSubmit={handleCreate} className="space-y-4">
              {creatingError && (
                <div className="p-2 rounded bg-red-100 dark:bg-red-900/30 text-red-700 dark:text-red-300 text-sm">
                  {creatingError}
                </div>
              )}
              <div>
                <label className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1">Username</label>
                <input
                  name="name"
                  type="text"
                  placeholder="ftpuser"
                  className="w-full px-4 py-2 border border-gray-300 dark:border-gray-600 rounded-lg bg-white dark:bg-gray-700"
                  required
                />
              </div>
              <div>
                <label className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1">Password</label>
                <input
                  name="password"
                  type="password"
                  placeholder="••••••••"
                  className="w-full px-4 py-2 border border-gray-300 dark:border-gray-600 rounded-lg bg-white dark:bg-gray-700"
                  required
                />
              </div>
              <div>
                <label className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1">Path</label>
                <input
                  name="path"
                  type="text"
                  placeholder="/www/wwwroot"
                  className="w-full px-4 py-2 border border-gray-300 dark:border-gray-600 rounded-lg bg-white dark:bg-gray-700"
                  required
                />
              </div>
              <div>
                <label className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1">Note (optional)</label>
                <input
                  name="ps"
                  type="text"
                  placeholder="My FTP"
                  className="w-full px-4 py-2 border border-gray-300 dark:border-gray-600 rounded-lg bg-white dark:bg-gray-700"
                />
              </div>
              <div className="flex gap-2 justify-end pt-2">
                <button
                  type="button"
                  onClick={() => setShowCreate(false)}
                  className="px-4 py-2 text-gray-600 hover:bg-gray-100 dark:hover:bg-gray-700 rounded-lg"
                >
                  Cancel
                </button>
                <button
                  type="submit"
                  disabled={creating}
                  className="px-4 py-2 bg-blue-600 hover:bg-blue-700 disabled:bg-blue-400 text-white rounded-lg font-medium"
                >
                  {creating ? 'Creating...' : 'Create'}
                </button>
              </div>
            </form>
          </div>
        </div>
      )}

      <div className="bg-white dark:bg-gray-800 rounded-lg shadow overflow-hidden">
        <table className="min-w-full divide-y divide-gray-200 dark:divide-gray-700">
          <thead className="bg-gray-50 dark:bg-gray-700">
            <tr>
              <th className="px-4 py-2 text-left text-sm font-medium text-gray-700 dark:text-gray-300">Name</th>
              <th className="px-4 py-2 text-left text-sm font-medium text-gray-700 dark:text-gray-300">Path</th>
              <th className="px-4 py-2 text-left text-sm font-medium text-gray-700 dark:text-gray-300">Note</th>
              <th className="px-4 py-2 text-right text-sm font-medium text-gray-700 dark:text-gray-300">Actions</th>
            </tr>
          </thead>
          <tbody className="divide-y divide-gray-200 dark:divide-gray-700">
            {accounts.length === 0 ? (
              <tr>
                <td colSpan={4} className="px-4 py-8 text-center text-gray-500">
                  No FTP accounts. Click "Add FTP" to create one.
                </td>
              </tr>
            ) : (
              accounts.map((a) => (
                <tr key={a.id}>
                  <td className="px-4 py-2 text-gray-900 dark:text-white">{a.name}</td>
                  <td className="px-4 py-2 text-gray-600 dark:text-gray-400">{a.path}</td>
                  <td className="px-4 py-2 text-gray-600 dark:text-gray-400">{a.ps || '-'}</td>
                  <td className="px-4 py-2 text-right">
                    <span className="flex gap-1 justify-end">
                      <button
                        onClick={() => setChangePwId(a.id)}
                        className="p-2 text-amber-600 hover:bg-amber-50 dark:hover:bg-amber-900/20 rounded"
                        title="Change password"
                      >
                        <Key className="w-4 h-4" />
                      </button>
                      <button
                        onClick={() => handleDelete(a.id, a.name)}
                        className="p-2 text-red-600 hover:bg-red-50 dark:hover:bg-red-900/20 rounded"
                        title="Delete"
                      >
                        <Trash2 className="w-4 h-4" />
                      </button>
                    </span>
                  </td>
                </tr>
              ))
            )}
          </tbody>
        </table>
      </div>

      {changePwId && (
        <div className="fixed inset-0 bg-black/50 flex items-center justify-center z-50">
          <div className="bg-white dark:bg-gray-800 rounded-lg shadow-xl p-6 w-full max-w-md">
            <h2 className="text-xl font-bold mb-4 text-gray-800 dark:text-white">Change FTP Password</h2>
            <form onSubmit={(e) => handleChangePassword(e, changePwId)} className="space-y-4">
              {pwError && (
                <div className="p-2 rounded bg-red-100 dark:bg-red-900/30 text-red-700 dark:text-red-300 text-sm">
                  {pwError}
                </div>
              )}
              <div>
                <label className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1">New Password</label>
                <input name="new_password" type="password" minLength={6} className="w-full px-4 py-2 border rounded-lg bg-white dark:bg-gray-700" required />
              </div>
              <div>
                <label className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1">Confirm Password</label>
                <input name="confirm_password" type="password" minLength={6} className="w-full px-4 py-2 border rounded-lg bg-white dark:bg-gray-700" required />
              </div>
              <div className="flex gap-2 justify-end">
                <button type="button" onClick={() => setChangePwId(null)} className="px-4 py-2 text-gray-600 hover:bg-gray-100 dark:hover:bg-gray-700 rounded-lg">
                  Cancel
                </button>
                <button type="submit" className="px-4 py-2 bg-blue-600 hover:bg-blue-700 text-white rounded-lg">
                  Update
                </button>
              </div>
            </form>
          </div>
        </div>
      )}
    </div>
  )
}