package main

import (
	"errors"
	"fmt"
	"net/http"
	"time"

	"github.com/PuerkitoBio/goquery"
)

func downloadXKCDList() []Comic {
	var ret []Comic
	ret = append(ret, *NewComic("xkcd", "XKCD", "Randall Munroe", "xkcd"))
	return ret
}

func getXKCDRssItem(slug string) (string, error) {
	desc, err := getXKCDFeedDesc(time.Now())
	if err != nil {
		return "", err
	}
	comic, err := m.GetComic(SRC_XKCD, slug)
	if err != nil {
		return "", err
	}
	desc = "<![CDATA[" + desc + "]]>"
	ret := "    <item>\n"
	ret += "      <title>" + comic.Name + "</title>\n"
	ret += "      <pubDate>" + comic.LastUpdate.Format(time.RFC1123Z) + "</pubDate>\n"
	ret += "      <guid>xkcd;" + slug + ";" + comic.LastUpdate.Format(time.RFC1123Z) + "</guid>\n"
	ret += "      <link>" + getXKCDComicUrl(time.Now()) + "</link>\n"
	ret += "      <description>" + desc + "</description>\n"
	ret += "    </item>\n"
	return ret, nil
}

func getXKCDComicUrl(date time.Time) string {
	// TODO: Actually make this work correctly
	// Get the previous comic number
	// and find the next one
	return fmt.Sprintf(
		"http://xkcd.com/",
	)
}

func getXKCDFeedDesc(date time.Time) (string, error) {
	res, err := http.Get(getXKCDComicUrl(date))
	if err != nil {
		return "", err
	}
	defer res.Body.Close()
	if res.StatusCode != 200 {
		return "", errors.New(fmt.Sprintf("Status code error: %d %s", res.StatusCode, res.Status))
	}

	// Load the HTML document
	doc, err := goquery.NewDocumentFromReader(res.Body)
	if err != nil {
		return "", err
	}
	// Find the Picture
	sel := doc.Find("div#comic>img")
	src, exists := sel.Attr("src")
	if !exists {
		return "", errors.New("Couldn't find image source")
	}
	src = "https:" + src
	title, exists := sel.Attr("title")
	if !exists {
		title = ""
	}
	return "<img src=\"" + src + "\" /><p>" + title + "</p>", nil
}