package configuration

import (
	"errors"
	"fmt"
	"net/url"
)

var (
	errDestIsEmpty   = errors.New("dest is empty")
	errFeedValidate  = errors.New("feed configuration validation")
	errNameIsEmpty   = errors.New("name is empty")
	errOutputIsEmpty = errors.New("output is empty")
	errURLIsEmpty    = errors.New("URL is empty")
)

// Feed is a single RSS feed configuration.
type Feed struct {
	Name        string `json:"name"`
	URL         string `json:"url"`
	Output      string `json:"output"`
	Destination string `json:"dest"`
}

// Validate validates RSS feed configuration.
func (f *Feed) Validate() error {
	if f.Name == "" {
		return fmt.Errorf("%w: %w", errFeedValidate, errNameIsEmpty)
	}

	if f.Output == "" {
		return fmt.Errorf("%w: %w", errFeedValidate, errOutputIsEmpty)
	}

	if f.Destination == "" {
		return fmt.Errorf("%w: %w", errFeedValidate, errDestIsEmpty)
	}

	if f.URL == "" {
		return fmt.Errorf("%w: %w", errFeedValidate, errURLIsEmpty)
	}

	if _, err := url.Parse(f.URL); err != nil {
		return fmt.Errorf("%w: parse feed URL: %w", errFeedValidate, err)
	}

	return nil
}