// src/components/admin/UserTableSection.tsx
'use client';

import { useState, useEffect } from 'react';
import {
  Typography, Table, TableBody, TableCell, TableContainer, TableHead,
  TableRow, Paper, Box, Button, Dialog, DialogTitle, DialogContent, DialogActions,
  TextField, Select, MenuItem, FormControl, InputLabel, IconButton
} from '@mui/material';
import EditIcon from '@mui/icons-material/Edit';
import SaveIcon from '@mui/icons-material/Save';
import CancelIcon from '@mui/icons-material/Cancel';
import UserEnableToggle from './UserEnableToggle';
import AddUserForm from './forms/AddUserForm';
import AddClientForm from './forms/AddClientForm';
import InviteUserForm from './forms/InviteUserForm';
import api from '@/lib/axios';

interface UserDTO {
  id: number;
  username: string;
  displayName: string;
  firstName: string;
  lastName: string;
  email: string;
  role: string;
  clientName: string;
  clientId?: number;
  enabled: boolean;
}

interface ClientDTO {
  clientId: number;
  clientIdentifier: string;
  clientName: string;
}

export default function UserTableSection({ initialUsers }: { initialUsers: UserDTO[] }) {
  const [users, setUsers] = useState<UserDTO[]>(initialUsers);
  const [openUserDialog, setOpenUserDialog] = useState(false);
  const [openClientDialog, setOpenClientDialog] = useState(false);
  const [openInviteUserDialog, setOpenInviteUserDialog] = useState(false);

  // Edit mode state
  const [editingUserId, setEditingUserId] = useState<number | null>(null);
  const [editFormData, setEditFormData] = useState<Partial<UserDTO>>({});
  const [clients, setClients] = useState<ClientDTO[]>([]);
  const [loading, setLoading] = useState(false);

  // Fetch clients for dropdown
  useEffect(() => {
    const fetchClients = async () => {
      try {
        const res = await api.get('/auth/clients');
        setClients(res.data);
      } catch (err) {
        console.error('Failed to fetch clients:', err);
      }
    };
    fetchClients();
  }, []);

  const handleEdit = (user: UserDTO) => {
    setEditingUserId(user.id);
    setEditFormData({
      username: user.username,
      displayName: user.displayName,
      firstName: user.firstName,
      lastName: user.lastName,
      email: user.email,
      role: user.role,
      clientName: user.clientName,
      clientId: user.clientId
    });
  };

  const handleCancel = () => {
    setEditingUserId(null);
    setEditFormData({});
  };

  const handleSave = async (userId: number) => {
    setLoading(true);
    try {
      // Find the selected client
      const selectedClient = clients.find(c => c.clientId === editFormData.clientId);

      await api.put(`/admin/users/${userId}`, {
        username: editFormData.username,
        displayName: editFormData.displayName,
        firstName: editFormData.firstName,
        lastName: editFormData.lastName,
        email: editFormData.email,
        role: editFormData.role,
        clientId: editFormData.clientId
      });

      // Update local state
      setUsers(users.map(user =>
        user.id === userId
          ? {
              ...user,
              ...editFormData,
              clientName: selectedClient?.clientName || user.clientName
            }
          : user
      ));

      setEditingUserId(null);
      setEditFormData({});
    } catch (err) {
      console.error('Failed to update user:', err);
      alert('Failed to update user. Please try again.');
    } finally {
      setLoading(false);
    }
  };

  return (
    <Box sx={{ p: 4 }}>
      <Typography variant="h5" gutterBottom>User Management</Typography>

      <Box sx={{ mb: 2, display: 'flex', gap: 2 }}>
        <Button variant="contained" color="primary" onClick={() => setOpenClientDialog(true)}>
          Add Client
        </Button>
        <Button variant="contained" color="success" onClick={() => setOpenUserDialog(true)}>
          Add User
        </Button>
        <Button variant="contained" color="success" onClick={() => setOpenInviteUserDialog(true)}>
          Invite User
        </Button>
      </Box>

      <TableContainer component={Paper}>
        <Table>
          <TableHead>
            <TableRow>
              <TableCell>Username</TableCell>
              <TableCell>Display Name</TableCell>
              <TableCell>First Name</TableCell>
              <TableCell>Last Name</TableCell>
              <TableCell>Email</TableCell>
              <TableCell>Role</TableCell>
              <TableCell>Client</TableCell>
              <TableCell>Status</TableCell>
              <TableCell>Actions</TableCell>
            </TableRow>
          </TableHead>
          <TableBody>
            {users.map((user) => {
              const isEditing = editingUserId === user.id;
              return (
                <TableRow key={user.id}>
                  <TableCell>
                    {isEditing ? (
                      <TextField
                        size="small"
                        value={editFormData.username || ''}
                        onChange={(e) => setEditFormData({ ...editFormData, username: e.target.value })}
                        fullWidth
                      />
                    ) : (
                      user.username
                    )}
                  </TableCell>
                  <TableCell>
                    {isEditing ? (
                      <TextField
                        size="small"
                        value={editFormData.displayName || ''}
                        onChange={(e) => setEditFormData({ ...editFormData, displayName: e.target.value })}
                        fullWidth
                      />
                    ) : (
                      user.displayName
                    )}
                  </TableCell>
                  <TableCell>
                    {isEditing ? (
                      <TextField
                        size="small"
                        value={editFormData.firstName || ''}
                        onChange={(e) => setEditFormData({ ...editFormData, firstName: e.target.value })}
                        fullWidth
                      />
                    ) : (
                      user.firstName
                    )}
                  </TableCell>
                  <TableCell>
                    {isEditing ? (
                      <TextField
                        size="small"
                        value={editFormData.lastName || ''}
                        onChange={(e) => setEditFormData({ ...editFormData, lastName: e.target.value })}
                        fullWidth
                      />
                    ) : (
                      user.lastName
                    )}
                  </TableCell>
                  <TableCell>
                    {isEditing ? (
                      <TextField
                        size="small"
                        value={editFormData.email || ''}
                        onChange={(e) => setEditFormData({ ...editFormData, email: e.target.value })}
                        fullWidth
                      />
                    ) : (
                      user.email
                    )}
                  </TableCell>
                  <TableCell>
                    {isEditing ? (
                      <FormControl fullWidth size="small">
                        <Select
                          value={editFormData.role || ''}
                          onChange={(e) => setEditFormData({ ...editFormData, role: e.target.value })}
                        >
                          <MenuItem value="USER">USER</MenuItem>
                          <MenuItem value="ADMIN">ADMIN</MenuItem>
                        </Select>
                      </FormControl>
                    ) : (
                      user.role
                    )}
                  </TableCell>
                  <TableCell>
                    {isEditing ? (
                      <FormControl fullWidth size="small">
                        <Select
                          value={editFormData.clientId || ''}
                          onChange={(e) => setEditFormData({ ...editFormData, clientId: Number(e.target.value) })}
                        >
                          {clients.map(client => (
                            <MenuItem key={client.clientId} value={client.clientId}>
                              {client.clientName}
                            </MenuItem>
                          ))}
                        </Select>
                      </FormControl>
                    ) : (
                      user.clientName
                    )}
                  </TableCell>
                  <TableCell>
                    <UserEnableToggle userId={user.id} initialEnabled={user.enabled} />
                  </TableCell>
                  <TableCell>
                    {isEditing ? (
                      <Box sx={{ display: 'flex', gap: 1 }}>
                        <IconButton
                          color="primary"
                          onClick={() => handleSave(user.id)}
                          disabled={loading}
                          size="small"
                        >
                          <SaveIcon />
                        </IconButton>
                        <IconButton
                          color="default"
                          onClick={handleCancel}
                          disabled={loading}
                          size="small"
                        >
                          <CancelIcon />
                        </IconButton>
                      </Box>
                    ) : (
                      <IconButton
                        color="primary"
                        onClick={() => handleEdit(user)}
                        size="small"
                      >
                        <EditIcon />
                      </IconButton>
                    )}
                  </TableCell>
                </TableRow>
              );
            })}
          </TableBody>
        </Table>
      </TableContainer>

      {/* Add Client Dialog */}
      <Dialog open={openClientDialog} onClose={() => setOpenClientDialog(false)}>
        <DialogTitle>Register New Client</DialogTitle>
        <DialogContent>
          <AddClientForm onClose={() => setOpenClientDialog(false)} />
        </DialogContent>
        <DialogActions>
          <Button onClick={() => setOpenClientDialog(false)}>Close</Button>
        </DialogActions>
      </Dialog>

      {/* Add User Dialog */}
      <Dialog open={openUserDialog} onClose={() => setOpenUserDialog(false)}>
        <DialogTitle>Register New User</DialogTitle>
        <DialogContent>
          <AddUserForm onClose={() => setOpenUserDialog(false)} />
        </DialogContent>
        <DialogActions>
          <Button onClick={() => setOpenUserDialog(false)}>Close</Button>
        </DialogActions>
      </Dialog>

      {/* Invite User Dialog */}
      <Dialog open={openInviteUserDialog} onClose={() => setOpenInviteUserDialog(false)}>
        <DialogTitle>Invite New User</DialogTitle>
        <DialogContent>
          <InviteUserForm onClose={() => setOpenInviteUserDialog(false)} />
        </DialogContent>
        <DialogActions>
          <Button onClick={() => setOpenInviteUserDialog(false)}>Close</Button>
        </DialogActions>
      </Dialog>
    </Box>
  );
}