package main

import (
  "log"
  "fmt"
  "sync"
  "regexp"
  "strings"
  "encoding/json"
  "encoding/xml"
  "io/ioutil"
  "net/http"
)

var (
  urlBase string = "https://metadata.provider.plex.tv"
  urlType string = "movie"
  urlToken string = "pass_as_get_param:token"
)

type Watchlist struct {
  Videos []struct {
    Key    string `xml:"key,attr"`
    Type   string `xml:"type,attr"`
    Url    string `xml:"publicPagesURL,attr"`
    Title  string `xml:"title,attr"`
    Year   int    `xml:"year,attr"`
    ImdbId string
  } `xml:"Video"`
}

type Metadata struct {
  Video struct {
    Title string `xml:"title,attr"`
    Guid []struct {
      Text string `xml:",chardata"`
      ID   string `xml:"id,attr"`
    } `xml:"Guid"`
  } `xml:"Video"`
}

type StevenLuJson struct {
  Title  string `json:"title"`
  ImdbId string `json:"imdb_id"`
}

func urlTypeInt() string {
  switch urlType {
  case "movie":
    return "1"
  case "serie":
    return "2"
  default:
    return "1"
  }
}

func generateUrl(get string) string {
  return urlBase + get + "?type=" + urlTypeInt() + "&X-Plex-Token=" + urlToken
}

func requestWatchlist() Watchlist {
  log.Println(generateUrl("/library/sections/watchlist/all"))
  resp, err := http.Get(generateUrl("/library/sections/watchlist/all"))

  if err != nil {
    log.Fatalln(err)
  }

  byteWatchlist, _ := ioutil.ReadAll(resp.Body)
  watchlist := Watchlist{}
  xml.Unmarshal(byteWatchlist, &watchlist)

  return watchlist
}

func requestMetadata(watchlist Watchlist) []Metadata {
  sliceMetadata := []Metadata{}
  var wg sync.WaitGroup
  wg.Add(len(watchlist.Videos))
  for i := 0; i < len(watchlist.Videos); i++ {
    go (func(url string) {
      log.Println(url)
      resp, err := http.Get(url)
      if err != nil {
        log.Fatalln(err)
      }
      byteImdb, _ := ioutil.ReadAll(resp.Body)
      metadata := Metadata{}
      xml.Unmarshal(byteImdb, &metadata)
      sliceMetadata = append(sliceMetadata, metadata)
      wg.Done()
    })(generateUrl(watchlist.Videos[i].Key))
  }
  wg.Wait()
  return sliceMetadata
}

func responseStevenLu(metadata []Metadata) string {
  sliceStevenLu := []StevenLuJson{}
  for _, data := range metadata {
    munged := StevenLuJson{}
    munged.Title = data.Video.Title
    for _, v := range data.Video.Guid {
      matched, _ := regexp.MatchString("imdb://", v.ID)
      if matched {
        munged.ImdbId = strings.Replace(v.ID, "imdb://", "", 1)
      }
    }
    sliceStevenLu = append(sliceStevenLu, munged)
  }
  b, err := json.Marshal(sliceStevenLu)
  if err != nil {
    log.Println(err)
  }
  return string(b)
}

func RequestHandler(w http.ResponseWriter, r *http.Request) {
  query := r.URL.Query()
  urlToken = query["token"][0]
  log.Println("token:", urlToken)
  log.Println("type:", urlType)
  watchlist := requestWatchlist()
  metadata := requestMetadata(watchlist)
  fmt.Fprintf(w, responseStevenLu(metadata))
}

func main() {

  http.HandleFunc("/", RequestHandler)

  log.Println("Listening...")
  log.Fatal(http.ListenAndServe(":3478", nil))
}