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// Package rss implements RSS fetcher
package rss

import (
	"encoding/xml"
	"net/http"
	"strings"
	"time"

	"code.google.com/p/go-charset/charset"
	_ "code.google.com/p/go-charset/data"
)

// RSS container
type RSS struct {
	Version string  `xml:"version,attr"`
	Channel Channel `xml:"channel"`
}

// Time in RFC1123Z or RFC1123 format
type Time struct {
	time.Time
}

// Channel container
type Channel struct {
	Link        string `xml:"link"`
	Language    string `xml:"language"`
	Title       string `xml:"title"`
	Description string `xml:"description"`
	PubDate     Time   `xml:"pubDate"`
	Items       []Item `xml:"item"`
}

// Item container
type Item struct {
	Author  string `xml:"author"`
	Link    string `xml:"link"`
	GUID    string `xml:"guid"`
	Title   string `xml:"title"`
	PubDate Time   `xml:"pubDate"`
}

// UnmarshalXML decodes Time format
func (t *Time) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
	var v string
	d.DecodeElement(&v, &start)
	v = strings.TrimSpace(v)
	parse, err := time.Parse(time.RFC1123Z, v)
	if err != nil {
		parse, err = time.Parse(time.RFC1123, v)
		if err != nil {
			return err
		}
	}
	*t = Time{parse}
	return nil
}

// Fetch and parse RSS from given URL
func Fetch(url string) (rss RSS, err error) {
	resp, err := http.Get(url)
	if err != nil {
		return rss, err
	}
	defer resp.Body.Close()
	decoder := xml.NewDecoder(resp.Body)
	decoder.CharsetReader = charset.NewReader
	err = decoder.Decode(&rss)
	if err != nil {
		return rss, err
	}
	return rss, nil
}