import { ipcMain } from 'electron';
import { buildCommandHandlers } from '../cqrs/commands';
import { buildQueryHandlers } from '../cqrs/queries';
import {
  Command,
  Query,
  CommandTypeKey,
  QueryTypeKey
} from '../cqrs/types';
import { getDataSource } from '../db/database';

export function setupCqrsHandlers(): void {
  const dataSource = getDataSource();

  if (!dataSource) {
    throw new Error('DataSource not initialised');
  }

  const commandHandlerMap = buildCommandHandlers(dataSource) as Record<CommandTypeKey, (command: Command) => unknown>;
  const queryHandlerMap = buildQueryHandlers(dataSource) as Record<QueryTypeKey, (query: Query) => unknown>;

  ipcMain.handle('cqrs:command', async (_evt, command: Command) => {
    const handler = commandHandlerMap[command.type as CommandTypeKey];

    if (!handler)
      throw new Error(`No command handler for type: ${command.type}`);

    return handler(command);
  });

  ipcMain.handle('cqrs:query', async (_evt, query: Query) => {
    const handler = queryHandlerMap[query.type as QueryTypeKey];

    if (!handler)
      throw new Error(`No query handler for type: ${query.type}`);

    return handler(query);
  });
}