import * as Errors from './error'
import findMatch from './match'
import addOverride from './override'
import { Dispatcher, DispatchOptions, DispatchHandler } from './types'

export default function create<TReturn, TDispatch>(
  options: DispatchOptions<TDispatch>
): Dispatcher<TReturn, TDispatch> {
  /**
   * Default behaviour is to not throw
   */
  options.throw = options.throw || false
  const dispatchers: Array<DispatchHandler<TReturn, TDispatch>> = []

  const name = options.name
  const override = (types: TDispatch[], handler: (...types: TDispatch[]) => TReturn) => {
    return addOverride(types, handler, dispatchers, options)
  }

  // Find the best match dispatcher and call its handler with the types provided
  const dispatch = (...types: TDispatch[]): TReturn | null => {
    const match = findMatch(types, dispatchers, options)
    return match
  }

  return {
    name,
    override,
    dispatch
  }
}

export { Errors, Dispatcher, DispatchOptions, DispatchHandler }