import { useEffect, useState } from 'react';
import { IoIosLink, IoIosTrash } from 'react-icons/io';
import { MdModeEdit } from 'react-icons/md';
import { GoUnlink } from 'react-icons/go';
import React from 'react';

import { useConnections, useOAuthConnect, useDisconnect } from '../../hooks/useConnections';
import { useLanguage } from '../../contexts/LanguageContext';
import { ColumnConfig } from '../FormGenerator';
import { EditFieldConfig } from '../Popup';
import { 
  Connection, 
  CreateConnectionData, 
  ConnectionsLogicReturn,
  TableAction 
} from './interfaces';

export function useConnectionsLogic(): ConnectionsLogicReturn {
  const { t } = useLanguage();
  
  // Hooks
  const { 
    connections, 
    fetchConnections, 
    createConnection, 
    updateConnection,
    connectService, 
    disconnectService, 
    deleteConnection, 
    isLoading, 
    error 
  } = useConnections();

  const { 
    connectWithPopup, 
    isConnecting, 
    error: connectError 
  } = useOAuthConnect();

  const { 
    disconnect, 
    isDisconnecting, 
    error: disconnectError 
  } = useDisconnect();

  // Local state
  const [editPopupOpen, setEditPopupOpen] = useState(false);
  const [editingConnection, setEditingConnection] = useState<Connection | null>(null);

  // Define field configuration for editing connections
  const connectionEditFields: EditFieldConfig[] = [
    {
      key: 'authority',
      label: t('connections.field.service', 'Service'),
      type: 'readonly',
      editable: false,
      formatter: (value: string) => {
        if (!value) return t('connections.unknown', 'Unknown');
        const labels = {
          'google': t('connections.service.google', 'Google'),
          'msft': t('connections.service.microsoft', 'Microsoft'),
          'local': t('connections.service.local', 'Local')
        };
        return labels[value as keyof typeof labels] || value;
      }
    },
    {
      key: 'status',
      label: t('connections.field.status', 'Status'),
      type: 'readonly',
      editable: false,
      formatter: (value: string) => value ? value.charAt(0).toUpperCase() + value.slice(1) : t('connections.unknown', 'Unknown')
    },
    {
      key: 'externalUsername',
      label: t('connections.field.external_username', 'External Username'),
      type: 'string',
      editable: true,
      required: false,
      placeholder: t('connections.placeholder.external_username', 'Enter external username')
    },
    {
      key: 'externalEmail',
      label: t('connections.field.external_email', 'External Email'),
      type: 'email',
      editable: true,
      required: false,
      placeholder: t('connections.placeholder.external_email', 'Enter external email address')
    },
    {
      key: 'connectedAt',
      label: t('connections.field.connected_at', 'Connected At'),
      type: 'readonly',
      editable: false,
      formatter: (value: string) => {
        if (!value) return t('connections.not_available', 'N/A');
        try {
          return new Date(value).toLocaleString();
        } catch {
          return t('connections.invalid_date', 'Invalid Date');
        }
      }
    },
    {
      key: 'lastChecked',
      label: t('connections.field.last_checked', 'Last Checked'),
      type: 'readonly',
      editable: false,
      formatter: (value: string) => {
        if (!value) return t('connections.not_available', 'N/A');
        try {
          return new Date(value).toLocaleString();
        } catch {
          return t('connections.invalid_date', 'Invalid Date');
        }
      }
    }
  ];

  // Define custom columns for the connections table
  const connectionColumns: ColumnConfig[] = [
    {
      key: 'authority',
      label: t('connections.field.service', 'Service'),
      type: 'enum',
      filterOptions: ['google', 'msft', 'local'],
      formatter: (value: string) => {
        if (!value) return t('connections.unknown', 'Unknown');
        const labels = {
          'google': t('connections.service.google', 'Google'),
          'msft': t('connections.service.microsoft', 'Microsoft'),
          'local': t('connections.service.local', 'Local')
        };
        return labels[value as keyof typeof labels] || value;
      },
      width: 150,
      sortable: true,
      filterable: true
    },
    {
      key: 'status',
      label: t('connections.field.status', 'Status'),
      type: 'enum',
      filterOptions: ['active', 'pending', 'expired', 'revoked'],
      formatter: (value: string) => {
        return value?.charAt(0).toUpperCase() + value?.slice(1) || t('connections.unknown', 'Unknown');
      },
      width: 120,
      sortable: true,
      filterable: true
    },
    {
      key: 'externalUsername',
      label: t('connections.field.external_username', 'External Username'),
      type: 'string',
      width: 200,
      sortable: true,
      filterable: false,
      searchable: true
    },
    {
      key: 'externalEmail',
      label: t('connections.field.external_email', 'External Email'),
      type: 'string',
      width: 250,
      sortable: true,
      filterable: false,
      searchable: true
    },
    {
      key: 'connectedAt',
      label: t('connections.field.connected_at', 'Connected At'),
      type: 'date',
      width: 150,
      sortable: true,
      filterable: false,
      searchable: true
    },
    {
      key: 'lastChecked',
      label: t('connections.field.last_checked', 'Last Checked'),
      type: 'date',
      width: 150,
      sortable: true,
      filterable: true,
      searchable: true
    },
    {
      key: 'expiresAt',
      label: t('connections.field.expires_at', 'Expires At'),
      type: 'date',
      width: 150,
      sortable: true,
      filterable: true
    }
  ];

  // Fetch connections on mount
  useEffect(() => {
    fetchConnections();
  }, []);

  // Handler functions
  const handleCreateConnection = async (type: 'msft' | 'google') => {
    console.log('Creating connection for type:', type);
    try {
      const connectionData: CreateConnectionData = {
        type: type,
        status: 'pending',
        connectedAt: new Date().toISOString(),
        lastChecked: new Date().toISOString()
      };
      
      console.log('Sending connection data to backend:', connectionData);
      const newConnection = await createConnection(connectionData);
      console.log('Connection created successfully:', newConnection);
      await fetchConnections();
    } catch (error) {
      console.error('Error creating connection:', error);
    }
  };

  const handleConnect = async (connection: Connection) => {
    console.log('Connecting to service:', connection);
    try {
      await connectWithPopup(connection.id);
      await fetchConnections();
    } catch (error) {
      console.error('Error connecting to service:', error);
    }
  };

  const handleDisconnect = async (connection: Connection) => {
    console.log('Disconnecting from service:', connection);
    try {
      await disconnect(connection.id);
      await fetchConnections();
    } catch (error) {
      console.error('Error disconnecting from service:', error);
    }
  };

  const handleDelete = async (connection: Connection) => {
    const serviceName = connection.authority?.charAt(0).toUpperCase() + connection.authority?.slice(1) || t('connections.unknown', 'Unknown');
    const confirmMessage = t('connections.confirm_delete', 'Are you sure you want to delete the {service} connection?').replace('{service}', serviceName);
    
    if (window.confirm(confirmMessage)) {
      try {
        await deleteConnection(connection.id);
        await fetchConnections();
      } catch (error) {
        console.error('Error deleting connection:', error);
      }
    }
  };

  const handleConnectOrDisconnect = async (connection: Connection) => {
    if (connection.status === 'active') {
      await handleDisconnect(connection);
    } else {
      await handleConnect(connection);
    }
  };

  const handleEditConnection = async (connection: Connection) => {
    console.log('Editing connection:', connection);
    setEditingConnection(connection);
    setEditPopupOpen(true);
  };

  const handleSaveConnection = async (updatedConnection: Connection) => {
    if (!editingConnection) return;
    
    try {
      const updateData = {
        externalUsername: updatedConnection.externalUsername,
        externalEmail: updatedConnection.externalEmail
      };
      
      await updateConnection(editingConnection.id, updateData);
      console.log('Connection updated successfully');
      await fetchConnections();
      setEditPopupOpen(false);
      setEditingConnection(null);
    } catch (error) {
      console.error('Error updating connection:', error);
    }
  };

  const handleCancelEdit = () => {
    setEditPopupOpen(false);
    setEditingConnection(null);
  };

  // Table actions 
  const tableActions: TableAction[] = [
    {
      label: t('connections.action.edit', 'Edit'),
      onClick: handleEditConnection,
      icon: <MdModeEdit />
    },
    {
      label: t('connections.action.toggle_connection', 'Toggle Connection'),
      onClick: handleConnectOrDisconnect,
      icon: (connection: Connection) => connection.status === 'active' ? <GoUnlink /> : <IoIosLink />
    },
    {
      label: t('connections.action.delete', 'Delete'),
      onClick: handleDelete,
      icon: <IoIosTrash />
    }
  ];

  return {
    // Data
    connections,
    isLoading,
    isConnecting,
    isDisconnecting,
    error,
    connectError,
    disconnectError,
    editPopupOpen,
    editingConnection,
    connectionColumns,
    connectionEditFields,
    tableActions,
    
    // Handlers
    handleCreateConnection,
    handleConnect,
    handleDisconnect,
    handleDelete,
    handleConnectOrDisconnect,
    handleEditConnection,
    handleSaveConnection,
    handleCancelEdit
  };
}