package feed

import (
	"encoding/gob"
	"fmt"
	"os"
	"time"

	"github.com/gorilla/feeds"
)

type Feed struct {
	feeds.Feed
}

func NewFeed(title, link, desc string) *Feed {
	return &Feed{
		Feed: feeds.Feed{
			Title:       title,
			Link:        &feeds.Link{Href: link},
			Description: desc,
		},
	}
}

func SaveFeed(feed *Feed, filename string) error {
	file, err := os.Create(filename)
	if err != nil {
		return fmt.Errorf("error creating file %v: %v", filename, err)
	}
	defer file.Close()

	encoder := gob.NewEncoder(file)
	err = encoder.Encode(feed)
	if err != nil {
		return fmt.Errorf("error encoding file %v: %v", filename, err)
	}

	return nil
}

func OpenFeed(filename string) (*Feed, error) {
	file, err := os.Open(filename)
	if err != nil {
		return nil, fmt.Errorf("error opening file %v: %v", filename, err)
	}
	defer file.Close()

	feed := &Feed{}
	decoder := gob.NewDecoder(file)
	err = decoder.Decode(feed)
	if err != nil {
		return nil, fmt.Errorf("error decoding file %v: %v", filename, err)
	}

	return feed, nil
}

func AddToFeed(feed *Feed, title, desc, content string) error {
	item := feeds.Item{
		Title:       title,
		Created:     time.Now(),
		Description: desc,
		Content:     content,
	}
	feed.Add(&item)

	rss, err := feed.ToRss()
	if err != nil {
		return fmt.Errorf("error converting feed to RSS: %v", err)
	}
	fmt.Println(rss)

	return nil
}