import React, { useState, useEffect } from 'react'
import { APP_VERSION } from '../config/version'

export default function Admin() {
  const [users, setUsers] = useState([])
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState('')
  const [showAddModal, setShowAddModal] = useState(false)
  const [editingUser, setEditingUser] = useState(null)
  const [newUser, setNewUser] = useState({ username: '', password: '', email: '', role: 'user' })
  const token = localStorage.getItem('token')
  
  const userStr = localStorage.getItem('user')
  let user = null
  try { user = userStr ? JSON.parse(userStr) : null } catch (e) {}
  
  if (!user || user.role !== 'admin') {
    return (
      <div style={{ minHeight: '100vh', display: 'flex', alignItems: 'center', justifyContent: 'center', background: '#0f172a', color: '#ef4444', padding: '20px' }}>
        <div style={{ textAlign: 'center' }}>
          <div style={{ fontSize: '48px', marginBottom: '16px' }}>🚫</div>
          <div style={{ fontSize: '18px', fontWeight: 'bold', marginBottom: '8px' }}>无权访问</div>
          <div style={{ color: '#94a3b8', fontSize: '14px' }}>仅管理员可以访问用户管理界面</div>
        </div>
      </div>
    )
  }

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

  const fetchUsers = async () => {
    try {
      const res = await fetch('/api/admin/users?page=1&limit=100', { headers: { 'Authorization': `Bearer ${token}` } })
      if (!res.ok) throw new Error('获取用户列表失败')
      const data = await res.json()
      setUsers(data)
    } catch (err) { setError(err.message) } finally { setLoading(false) }
  }

  const handleDeleteUser = async (userId, username) => {
    if (!confirm(`确定要删除用户 "${username}" 吗？`)) return
    try {
      const res = await fetch(`/api/admin/users/${userId}`, { method: 'DELETE', headers: { 'Authorization': `Bearer ${token}` } })
      if (!res.ok) throw new Error('删除失败')
      fetchUsers()
    } catch (err) { alert(err.message) }
  }

  const handleAddUser = async () => {
    if (!newUser.username || !newUser.password) { alert('用户名和密码为必填项'); return }
    const payload = { ...newUser }
    if (!payload.email) delete payload.email
    try {
      const res = await fetch('/api/auth/register', { method: 'POST', headers: { 'Content-Type': 'application/json', 'Authorization': `Bearer ${token}` }, body: JSON.stringify(payload) })
      if (!res.ok) { const data = await res.json(); throw new Error(data.detail || '添加失败') }
      alert('添加成功！')
      setShowAddModal(false)
      setNewUser({ username: '', password: '', email: '', role: 'user' })
      fetchUsers()
    } catch (err) { alert(err.message) }
  }

  const handleEditUser = async () => {
    if (!editingUser.username) { alert('用户名不能为空'); return }
    if (editingUser.newPassword || editingUser.confirmPassword) {
      if (!editingUser.newPassword || !editingUser.confirmPassword) { alert('请填写完整密码信息'); return }
      if (editingUser.newPassword !== editingUser.confirmPassword) { alert('两次输入的密码不一致'); return }
      if (editingUser.newPassword.length < 6) { alert('密码至少 6 个字符'); return }
    }
    try {
      const updateData = {
        username: editingUser.username,
        email: editingUser.email,
        phone: editingUser.phone,
        role: editingUser.role,
        level: editingUser.level,
        points: editingUser.points
      }
      if (editingUser.newPassword && editingUser.newPassword.trim()) updateData.password = editingUser.newPassword
      const res = await fetch(`/api/admin/users/${editingUser.id}`, { method: 'PUT', headers: { 'Content-Type': 'application/json', 'Authorization': `Bearer ${token}` }, body: JSON.stringify(updateData) })
      if (!res.ok) { const data = await res.json(); throw new Error(data.detail || '更新失败') }
      alert('更新成功！')
      setEditingUser(null)
      fetchUsers()
    } catch (err) { alert(err.message) }
  }

  if (loading) return <div style={{ padding: '20px', color: '#fff' }}>加载中...</div>
  if (error) return <div style={{ padding: '20px', color: '#ef4444' }}>⚠️ {error}</div>

  return (
    <div style={{ minHeight: '100vh', overflowY: 'auto', background: '#0f172a', padding: '20px', paddingBottom: '80px' }}>
      <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: '20px' }}>
        <h1 style={{ color: '#fbbf24', fontSize: '24px', fontWeight: '700' }}>⚙️ 用户管理</h1>
        <button onClick={() => setShowAddModal(true)} style={{ padding: '10px 20px', background: '#fbbf24', color: '#1e293b', border: 'none', borderRadius: '8px', fontSize: '14px', fontWeight: '600', cursor: 'pointer' }}>➕ 添加用户</button>
      </div>

      <div style={{ display: 'flex', flexDirection: 'column', gap: '12px' }}>
        {users.map(u => (
          <div key={u.id} style={{ background: 'rgba(30, 41, 59, 0.8)', borderRadius: '12px', padding: '16px', position: 'relative' }}>
            <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
              <div style={{ flex: 1 }}>
                <div style={{ display: 'flex', alignItems: 'center', gap: '8px' }}>
                  <div style={{ color: '#fbbf24', fontSize: '16px', fontWeight: 'bold' }}><span style={{ color: '#64748b', fontSize: '12px' }}>#{u.user_code}</span> {u.username}</div>
                  <div style={{ padding: '2px 8px', borderRadius: '4px', background: u.role === 'admin' ? 'rgba(16, 185, 129, 0.2)' : u.role === 'editor' ? 'rgba(59, 130, 246, 0.2)' : 'rgba(148, 163, 184, 0.2)', color: u.role === 'admin' ? '#10b981' : u.role === 'editor' ? '#3b82f6' : '#94a3b8', fontSize: '12px' }}>
                    {u.role === 'admin' ? '👑 管理员' : u.role === 'editor' ? '📝 信息员' : '👤 用户'}
                  </div>
                  {u.level && <span style={{ color: '#f59e0b', fontSize: '14px' }}>{u.level === '青铜' ? '🥉' : u.level === '白银' ? '🥈' : u.level === '黄金' ? '🥇' : u.level === '钻石' ? '💎' : '👑'} {u.level}</span>}
                </div>
                <div style={{ color: '#64748b', fontSize: '13px', marginTop: '4px' }}>📧 {u.email || '未设置'} | 📱 {u.phone || '未设置'}</div>
                <div style={{ display: 'grid', gridTemplateColumns: 'repeat(4, 1fr)', gap: '8px', marginTop: '10px' }}>
                  <a href={`#/list?userId=${u.id}&username=${encodeURIComponent(u.username)}`} style={{ background: '#0f172a', padding: '8px', borderRadius: '6px', textAlign: 'center', textDecoration: 'none', cursor: 'pointer', transition: 'all 0.2s' }} title='点击查看用户藏品' onMouseOver={(e) => e.currentTarget.style.background = 'rgba(34,197,94,0.2)'} onMouseOut={(e) => e.currentTarget.style.background = '#0f172a'}><div style={{ color: '#64748b', fontSize: '10px' }}>藏品</div><div style={{ color: '#22c55e', fontSize: '14px', fontWeight: 'bold' }}>{u.collectionCount || 0}</div></a>
                  <div style={{ background: '#0f172a', padding: '8px', borderRadius: '6px', textAlign: 'center' }}><div style={{ color: '#64748b', fontSize: '10px' }}>AI识别</div><div style={{ color: '#3b82f6', fontSize: '14px', fontWeight: 'bold' }}>{u.aiCount || 0}</div></div>
                  <div style={{ background: '#0f172a', padding: '8px', borderRadius: '6px', textAlign: 'center' }}><div style={{ color: '#64748b', fontSize: '10px' }}>寻号</div><div style={{ color: '#f59e0b', fontSize: '14px', fontWeight: 'bold' }}>{u.searchCount || 0}</div></div>
                  <div style={{ background: '#0f172a', padding: '8px', borderRadius: '6px', textAlign: 'center' }}><div style={{ color: '#64748b', fontSize: '10px' }}>积分</div><div style={{ color: '#8b5cf6', fontSize: '14px', fontWeight: 'bold' }}>{u.points || 0}</div></div>
                </div>
              </div>
              <div style={{ textAlign: 'right' }}>
                <div style={{ color: '#94a3b8', fontSize: '12px' }}>余额</div>
                <div style={{ color: '#60a5fa', fontSize: '18px', fontWeight: 'bold' }}>¥{u.balance || 0}</div>
              </div>
            </div>
            <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginTop: '12px', paddingTop: '12px', borderTop: '1px solid rgba(255,255,255,0.1)' }}>
              <div style={{ color: '#64748b', fontSize: '12px' }}>注册时间：{u.created_at ? new Date(u.created_at).toLocaleDateString('zh-CN') : '-'}</div>
              <div style={{ display: 'flex', gap: '8px' }}>
                <button onClick={() => setEditingUser({ ...u })} style={{ padding: '6px 12px', borderRadius: '6px', border: 'none', background: 'rgba(59, 130, 246, 0.2)', color: '#3b82f6', cursor: 'pointer', fontSize: '12px' }}>✏️ 编辑</button>
                {u.role !== 'admin' && <button onClick={() => handleDeleteUser(u.id, u.username)} style={{ padding: '6px 12px', borderRadius: '6px', border: 'none', background: 'rgba(239, 68, 68, 0.2)', color: '#ef4444', cursor: 'pointer', fontSize: '12px' }}>🗑️ 删除</button>}
              </div>
            </div>
          </div>
        ))}
      </div>

      {users.length === 0 && <div style={{ padding: '40px', textAlign: 'center', color: '#94a3b8' }}>暂无用户数据</div>}

      {/* 添加用户弹窗 */}
      {showAddModal && (
        <div style={{ position: 'fixed', top: 0, left: 0, right: 0, bottom: 0, background: 'rgba(0,0,0,0.8)', display: 'flex', alignItems: 'center', justifyContent: 'center', zIndex: 1000 }}>
          <div style={{ background: '#1e293b', borderRadius: '12px', padding: '24px', width: '90%', maxWidth: '400px' }}>
            <h2 style={{ color: '#fff', fontSize: '18px', fontWeight: 'bold', marginBottom: '20px' }}>添加用户</h2>
            <div style={{ marginBottom: '16px' }}><label style={{ display: 'block', color: '#94a3b8', fontSize: '13px', marginBottom: '6px' }}>用户名 *</label><input type="text" value={newUser.username} onChange={(e) => setNewUser({ ...newUser, username: e.target.value })} style={{ width: '100%', padding: '10px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '8px', color: '#fff' }} /></div>
            <div style={{ marginBottom: '16px' }}><label style={{ display: 'block', color: '#94a3b8', fontSize: '13px', marginBottom: '6px' }}>密码 *</label><input type="password" value={newUser.password} onChange={(e) => setNewUser({ ...newUser, password: e.target.value })} style={{ width: '100%', padding: '10px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '8px', color: '#fff' }} /></div>
            <div style={{ marginBottom: '16px' }}><label style={{ display: 'block', color: '#94a3b8', fontSize: '13px', marginBottom: '6px' }}>邮箱</label><input type="email" value={newUser.email} onChange={(e) => setNewUser({ ...newUser, email: e.target.value })} style={{ width: '100%', padding: '10px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '8px', color: '#fff' }} /></div>
            <div style={{ marginBottom: '20px' }}><label style={{ display: 'block', color: '#94a3b8', fontSize: '13px', marginBottom: '6px' }}>角色</label><select value={newUser.role} onChange={(e) => setNewUser({ ...newUser, role: e.target.value })} style={{ width: '100%', padding: '10px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '8px', color: '#fff' }}><option value="user">普通用户</option><option value="editor">信息员</option><option value="admin">管理员</option></select></div>
            <div style={{ display: 'flex', gap: '12px' }}><button onClick={() => setShowAddModal(false)} style={{ flex: 1, padding: '12px', background: 'rgba(255,255,255,0.1)', color: '#fff', border: 'none', borderRadius: '8px', cursor: 'pointer' }}>取消</button><button onClick={handleAddUser} style={{ flex: 1, padding: '12px', background: '#fbbf24', color: '#1e293b', border: 'none', borderRadius: '8px', fontWeight: '600', cursor: 'pointer' }}>确定</button></div>
          </div>
        </div>
      )}

      {/* 编辑用户弹窗 - 完整字段 */}
      {editingUser && (
        <div style={{ position: 'fixed', top: 0, left: 0, right: 0, bottom: 0, background: 'rgba(0,0,0,0.8)', display: 'flex', alignItems: 'center', justifyContent: 'center', zIndex: 1000 }}>
          <div style={{ background: '#1e293b', borderRadius: '12px', padding: '24px', width: '90%', maxWidth: '600px', maxHeight: '90vh', overflowY: 'auto' }}>
            <h2 style={{ color: '#fff', fontSize: '18px', fontWeight: 'bold', marginBottom: '20px' }}>编辑用户</h2>
            
            {/* 基本信息 */}
            <div style={{ marginBottom: '20px' }}>
              <h3 style={{ color: '#fbbf24', fontSize: '14px', fontWeight: 'bold', marginBottom: '12px', paddingBottom: '6px', borderBottom: '1px solid rgba(251, 191, 36, 0.3)' }}>📋 基本信息</h3>
              <div style={{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: '12px' }}>
                <div><label style={{ display: 'block', color: '#94a3b8', fontSize: '12px', marginBottom: '4px' }}>用户码</label><input type="text" value={editingUser.user_code || ''} onChange={(e) => setEditingUser({ ...editingUser, user_code: e.target.value })} style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fbbf24', fontSize: '13px' }} /></div><div><label style={{ display: 'block', color: '#94a3b8', fontSize: '12px', marginBottom: '4px' }}>用户名</label><input type="text" value={editingUser.username} onChange={(e) => setEditingUser({ ...editingUser, username: e.target.value })} style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }} /></div>
                <div><label style={{ display: 'block', color: '#94a3b8', fontSize: '12px', marginBottom: '4px' }}>手机号</label><input type="text" value={editingUser.phone || ''} onChange={(e) => setEditingUser({ ...editingUser, phone: e.target.value })} style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }} /></div>
                <div style={{ gridColumn: 'span 2' }}><label style={{ display: 'block', color: '#94a3b8', fontSize: '12px', marginBottom: '4px' }}>邮箱</label><input type="email" value={editingUser.email || ''} onChange={(e) => setEditingUser({ ...editingUser, email: e.target.value })} style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }} /></div>
              </div>
            </div>

            {/* 会员信息 */}
            <div style={{ marginBottom: '20px' }}>
              <h3 style={{ color: '#fbbf24', fontSize: '14px', fontWeight: 'bold', marginBottom: '12px', paddingBottom: '6px', borderBottom: '1px solid rgba(251, 191, 36, 0.3)' }}>⭐ 会员信息</h3>
              <div style={{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: '12px' }}>
                <div><label style={{ display: 'block', color: '#94a3b8', fontSize: '12px', marginBottom: '4px' }}>角色</label><select value={editingUser.role || 'user'} onChange={(e) => setEditingUser({ ...editingUser, role: e.target.value })} style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }}><option value="user">普通用户</option><option value="editor">信息员</option><option value="admin">管理员</option></select></div>
                <div><label style={{ display: 'block', color: '#94a3b8', fontSize: '12px', marginBottom: '4px' }}>会员等级</label><select value={editingUser.level || '青铜'} onChange={(e) => setEditingUser({ ...editingUser, level: e.target.value })} style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }}><option value="青铜">🥉 青铜</option><option value="白银">🥈 白银</option><option value="黄金">🥇 黄金</option><option value="钻石">💎 钻石</option><option value="王者">👑 王者</option></select></div>
                <div><label style={{ display: 'block', color: '#94a3b8', fontSize: '12px', marginBottom: '4px' }}>积分</label><input type="number" value={editingUser.points || 0} onChange={(e) => setEditingUser({ ...editingUser, points: parseInt(e.target.value) || 0 })} style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }} /></div>
                <div><label style={{ display: 'block', color: '#94a3b8', fontSize: '12px', marginBottom: '4px' }}>余额</label><input type="number" value={editingUser.balance || 0} onChange={(e) => setEditingUser({ ...editingUser, balance: parseFloat(e.target.value) || 0 })} style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }} /></div>
              </div>
            </div>

            {/* 统计信息（只读） */}
            <div style={{ marginBottom: '20px' }}>
              <h3 style={{ color: '#fbbf24', fontSize: '14px', fontWeight: 'bold', marginBottom: '12px', paddingBottom: '6px', borderBottom: '1px solid rgba(251, 191, 36, 0.3)' }}>📊 统计数据（仅展示）</h3>
              <div style={{ display: 'grid', gridTemplateColumns: 'repeat(4, 1fr)', gap: '8px' }}>
                <div style={{ background: '#0f172a', padding: '8px', borderRadius: '6px', textAlign: 'center' }}><div style={{ color: '#64748b', fontSize: '10px' }}>藏品</div><div style={{ color: '#22c55e', fontSize: '14px', fontWeight: 'bold' }}>{editingUser.collectionCount || 0}</div></div>
                <div style={{ background: '#0f172a', padding: '8px', borderRadius: '6px', textAlign: 'center' }}><div style={{ color: '#64748b', fontSize: '10px' }}>AI识别</div><div style={{ color: '#3b82f6', fontSize: '14px', fontWeight: 'bold' }}>{editingUser.aiCount || 0}</div></div>
                <div style={{ background: '#0f172a', padding: '8px', borderRadius: '6px', textAlign: 'center' }}><div style={{ color: '#64748b', fontSize: '10px' }}>寻号</div><div style={{ color: '#f59e0b', fontSize: '14px', fontWeight: 'bold' }}>{editingUser.searchCount || 0}</div></div>
                <div style={{ background: '#0f172a', padding: '8px', borderRadius: '6px', textAlign: 'center' }}><div style={{ color: '#64748b', fontSize: '10px' }}>登录</div><div style={{ color: '#8b5cf6', fontSize: '14px', fontWeight: 'bold' }}>{editingUser.loginCount || 0}</div></div>
              </div>
            </div>

            {/* 修改密码 */}
            <div style={{ marginBottom: '20px' }}>
              <h3 style={{ color: '#fbbf24', fontSize: '14px', fontWeight: 'bold', marginBottom: '12px', paddingBottom: '6px', borderBottom: '1px solid rgba(251, 191, 36, 0.3)' }}>🔐 修改密码（可选）</h3>
              <div style={{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: '12px' }}>
                <div><label style={{ display: 'block', color: '#94a3b8', fontSize: '12px', marginBottom: '4px' }}>新密码</label><input type="password" value={editingUser.newPassword || ''} onChange={(e) => setEditingUser({ ...editingUser, newPassword: e.target.value })} placeholder="留空则不修改" style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }} /></div>
                <div><label style={{ display: 'block', color: '#94a3b8', fontSize: '12px', marginBottom: '4px' }}>确认密码</label><input type="password" value={editingUser.confirmPassword || ''} onChange={(e) => setEditingUser({ ...editingUser, confirmPassword: e.target.value })} placeholder="再次输入" style={{ width: '100%', padding: '8px', background: 'rgba(255,255,255,0.05)', border: '1px solid rgba(255,255,255,0.1)', borderRadius: '6px', color: '#fff', fontSize: '13px' }} /></div>
              </div>
            </div>

            <div style={{ display: 'flex', gap: '12px' }}>
              <button onClick={() => setEditingUser(null)} style={{ flex: 1, padding: '12px', background: 'rgba(255,255,255,0.1)', color: '#fff', border: 'none', borderRadius: '8px', cursor: 'pointer' }}>取消</button>
              <button onClick={handleEditUser} style={{ flex: 1, padding: '12px', background: '#fbbf24', color: '#1e293b', border: 'none', borderRadius: '8px', fontWeight: '600', cursor: 'pointer' }}>保存</button>
            </div>
          </div>
        </div>
      )}
    </div>
  )
}