package main

import (
    "encoding/xml"
    "io/ioutil"
    "log"
    "net/url"
    "path"
    "strconv"
    "strings"
    "time"

    "github.com/ChannelMeter/iso8601duration"
    "github.com/PuerkitoBio/goquery"
    "github.com/cheggaaa/pb"

    "git.1750studios.com/gronkhDE/gogronkh/config"
    "git.1750studios.com/gronkhDE/gogronkh/database"
    "git.1750studios.com/gronkhDE/gogronkh/image"
    "git.1750studios.com/gronkhDE/gogronkh/youtube"
)

type RSSItem struct {
    Link        string         `xml:"link"`
}

type RSSFeed struct {
    Items       []RSSItem      `xml:"channel>item"`
}

func ParseRSSFeeds() {
    var authors []database.Author
    database.Db.Find(&authors)
    for _, AT := range authors {
        var Feed RSSFeed
        res, err := GetHTTPResource(config.C.GronkhUrl + "/zeige/" + AT.Slug.String + "/feed")
        if err != nil {
            log.Printf("ERR RS %s: Request failed (%+v)", AT.Slug, err)
            continue
        }
        defer res.Body.Close()
        body, err := ioutil.ReadAll(res.Body)
        if err != nil {
            log.Fatalf("ERR RS %s: Document failure (%+v)", AT.Slug, err)
            continue
        }
        xerr := xml.Unmarshal(body, &Feed)
        if xerr != nil {
            log.Printf("ERR RS %s: XML failure (%+v)", AT.Slug, err)
            continue
        }
        bar := pb.StartNew(len(Feed.Items))
        for _, item := range Feed.Items {
            ur, _ := url.Parse(item.Link)
            slug := path.Base(ur.Path)
            var count int
            if database.Db.Model(database.Episode{}).Where("slug = ?", slug).Count(&count); count > 0 {
                var EP database.Episode
                database.Db.Where("slug = ?", slug).First(&EP)
                wg.Add(1)
                go UpdateEpisode(EP, bar)
            } else {
                wg.Add(1)
                go ParseFeedEpisode(item.Link, bar)
            }
        }
        wg.Wait()
        bar.FinishPrint("Parsed RSS feed for " + AT.Slug.String)
    }
    GenerateSitemap()
}

func ParseFeedEpisode(u string, bar *pb.ProgressBar) {
    defer wg.Done()
    if bar != nil {
        defer bar.Increment()
    }
    ur, _ := url.Parse(u)
    slug := path.Base(ur.Path)
    var EP database.Episode
    EP.Slug.String = slug
    var LP database.LetsPlay
    database.Db.Where("slug = ?", path.Base(path.Dir(ur.Path))).First(&LP)
    if LP.ID == 0 {
        wg.Add(1)
        LP.Slug.String = path.Base(path.Dir(ur.Path))
        ParseLPPage(LP.Slug.String, &LP, nil)
        if LP.ID == 0 {
            return
        }
    }
    EP.LetsPlayID = LP.ID
    res, err := GetHTTPResource(u)
    if err != nil {
        log.Printf("ERR RS %s: Request failed (%+v)", slug, err)
        return
    }
    doc, err := goquery.NewDocumentFromResponse(res)
    if err != nil {
        log.Printf("ERR RS %s: Document failure (%+v)", slug, err)
        return
    }
    EP.Name.String = doc.Find("div.article > h2").First().Text()
    if EP.Name.String == "" {
        log.Printf("ERR RS %s: Episode name empty", slug)
        return
    }
    if match := episodeRegex.FindStringSubmatch(EP.Name.String); len(match) > 0 {
        num, _ := strconv.Atoi(match[1])
        EP.Episode.Int64 = int64(num)
    } else {
        log.Printf("SUC RSS %s: Name does not match RegEx", slug)   
        EP.Episode.Int64 = 0
    }
    doc.Find(".article > p").Each(func(i int, s *goquery.Selection) {
        EP.Descr.String += s.Text() + "\n"
    })
    EP.Descr.String = strings.Trim(EP.Descr.String, "\n ")
    EP.AuthorID = LP.AuthorID
    yt, _ := doc.Find(".youtube > iframe").Attr("src")
    ytpath, _ := url.Parse(yt)
    EP.Youtube.String = path.Base(ytpath.Path)
    if EP.Youtube.String == "watch" {
        EP.Youtube.String = ytpath.Query().Get("v")
        if idx := strings.LastIndex(EP.Youtube.String, "?"); idx != -1 {
            EP.Youtube.String = EP.Youtube.String[:idx]
        }
    }
    ytres, err := youtube.GetVideos([]string {"snippet", "statistics", "status", "contentDetails"}, []string {EP.Youtube.String}, config.C.YoutubeKey)
    if err != nil || len(ytres.Items) == 0 || ytres.Items[0].Status.UploadStatus != "processed" {
        log.Printf("WAR RS %s: Video %s is private (%s)", slug, EP.Youtube.String, err)
        return
    }
    if EP.Descr.String == "" {
        EP.Descr.String = ytres.Items[0].Snippet.Description
    }
    if thumb, ok := ytres.Items[0].Snippet.Thumbnails["maxres"]; ok {
        EP.ThumbS.String, EP.ThumbB.String, err = image.ResizeThumb(thumb.Url)
    } else if thumb, ok := ytres.Items[0].Snippet.Thumbnails["high"]; ok {
        EP.ThumbS.String, EP.ThumbB.String, err = image.ResizeThumb(thumb.Url)
    }
    if err != nil {
        log.Printf("WAR EP %s: Error resizing thumbnail: %+v", slug, err)
    }
    EP.Aired, err = time.Parse(time.RFC3339Nano, ytres.Items[0].Snippet.PublishedAt)
    if err != nil {
        log.Printf("ERR RS %s: Could not parse aired", slug)
        return
    }
    dur, err := duration.FromString(ytres.Items[0].ContentDetails.Duration)
    if err == nil {
        EP.Duration.Int64 = int64(dur.ToDuration().Seconds())
    } else {
        log.Printf("SUC RSS %s: Could not parse duration", slug)
        EP.Duration.Int64 = 0
    }
    EP.Rating.Float64, EP.Votes.Int64 = youtube.GetRatingAndVotesWithRes(ytres)

    if err := database.Db.Create(&EP).Error; err != nil {
        log.Printf("ERR RS %s: Could not be added to databse (%+v)", slug, err)
    } else {
        log.Printf("SUC RSS %s: Added to database", slug)
    }
}