package ctrlsubsonic

import (
	"log"
	"net/http"
	"os"
	"path"
	"time"

	"github.com/jinzhu/gorm"

	"senan.xyz/g/gonic/db"
	"senan.xyz/g/gonic/mime"
	"senan.xyz/g/gonic/server/ctrlsubsonic/encode"
	"senan.xyz/g/gonic/server/ctrlsubsonic/params"
	"senan.xyz/g/gonic/server/ctrlsubsonic/spec"
)

// Put special clients that can't handle Opus here:
func encodeProfileFor(client string) string {
	switch client {
	case "Soundwaves":
		return "mp3_rg"
	case "Jamstash":
		return "opus_rg"
	default:
		return "opus"
	}
}

func fileExists(filename string) bool {
	info, err := os.Stat(filename)
	if os.IsNotExist(err) {
		return false
	}
	return !info.IsDir()
}

// "raw" handlers are ones that don't always return a spec response.
// it could be a file, stream, etc. so you must either
//   a) write to response writer
//   b) return a non-nil spec.Response
//  _but not both_

func (c *Controller) ServeGetCoverArt(w http.ResponseWriter, r *http.Request) *spec.Response {
	params := r.Context().Value(CtxParams).(params.Params)
	id, err := params.GetInt("id")
	if err != nil {
		return spec.NewError(10, "please provide an `id` parameter")
	}
	folder := &db.Album{}
	err = c.DB.
		Select("id, left_path, right_path, cover").
		First(folder, id).
		Error
	if gorm.IsRecordNotFoundError(err) {
		return spec.NewError(10, "could not find a cover with that id")
	}
	if folder.Cover == "" {
		return spec.NewError(10, "no cover found for that folder")
	}
	absPath := path.Join(
		c.MusicPath,
		folder.LeftPath,
		folder.RightPath,
		folder.Cover,
	)
	http.ServeFile(w, r, absPath)
	return nil
}

func (c *Controller) ServeStream(w http.ResponseWriter, r *http.Request) *spec.Response {
	params := r.Context().Value(CtxParams).(params.Params)
	id, err := params.GetInt("id")
	if err != nil {
		return spec.NewError(10, "please provide an `id` parameter")
	}
	track := &db.Track{}
	err = c.DB.
		Preload("Album").
		First(track, id).
		Error
	if gorm.IsRecordNotFoundError(err) {
		return spec.NewError(70, "media with id `%d` was not found", id)
	}
	defer func() {
		user := r.Context().Value(CtxUser).(*db.User)
		play := db.Play{
			AlbumID: track.Album.ID,
			UserID:  user.ID,
		}
		c.DB.
			Where(play).
			First(&play)
		play.Time = time.Now() // for getAlbumList?type=recent
		play.Count++           // for getAlbumList?type=frequent
		c.DB.Save(&play)
	}()
	client := params.GetOr("c", "generic")
	maxBitrate, err := params.GetInt("maxBitRate")
	if err != nil {
		maxBitrate = 0
	}

	absPath := path.Join(
		c.MusicPath,
		track.Album.LeftPath,
		track.Album.RightPath,
		track.Filename,
	)
	profileName := encodeProfileFor(client)
	profile := encode.Profiles[profileName]
	bitrate := encode.GetBitrate(maxBitrate, profile)
	cacheKey := encode.CacheKey(absPath, profileName, bitrate)
	cacheFile := path.Join(c.CachePath, cacheKey)
	if fileExists(cacheFile) {
		log.Printf("cache [%s/%s] hit!\n", profile.Format, bitrate)
		http.ServeFile(w, r, cacheFile)
		return nil
	}
	log.Printf("cache [%s/%s] miss!\n", profile.Format, bitrate)
	if err := encode.Encode(w, absPath, cacheFile, profile, bitrate); err != nil {
		log.Printf("error encoding %q: %v\n", absPath, err)
	}
	log.Printf("track `%s` encoded to [%s/%s] successfully\n",
		track.Filename, profile.Format, bitrate)
	return nil
}

func (c *Controller) ServeDownload(w http.ResponseWriter, r *http.Request) *spec.Response {
	params := r.Context().Value(CtxParams).(params.Params)
	id, err := params.GetInt("id")
	if err != nil {
		return spec.NewError(10, "please provide an `id` parameter")
	}
	track := &db.Track{}
	err = c.DB.
		Preload("Album").
		First(track, id).
		Error
	if gorm.IsRecordNotFoundError(err) {
		return spec.NewError(70, "media with id `%d` was not found", id)
	}

	absPath := path.Join(
		c.MusicPath,
		track.Album.LeftPath,
		track.Album.RightPath,
		track.Filename,
	)
	if mime, ok := mime.Types[track.Ext()]; ok {
		w.Header().Set("Content-Type", mime)
	}
	http.ServeFile(w, r, absPath)

	//
	// We don't need to mark album/track as played
	// if user just downloads a track, so bail out here:
	return nil
}