package tools

import "fmt"

// Interface for all types of wrapper around a channel of results and an error channel
// Implementors will expose a type-specific channel for results
// Call the Wait() function after processing the results channel to catch any errors
// that occurred during the async processing
type ChannelWrapper interface {
	// Call this after processing results channel to check for async errors
	Wait() error
}

// Base implementation of channel wrapper to just deal with errors
type BaseChannelWrapper struct {
	errorChan <-chan error
}

func (w *BaseChannelWrapper) Wait() error {
	var err error
	for e := range w.errorChan {
		if err != nil {
			// Combine in case multiple errors
			err = fmt.Errorf("%v\n%v", err, e)

		} else {
			err = e
		}
	}

	return err
}

func NewBaseChannelWrapper(errChan <-chan error) *BaseChannelWrapper {
	return &BaseChannelWrapper{errorChan: errChan}
}