package http

import (
	"dwelling-radio/internal/configuration"
	"dwelling-radio/internal/radio"
	"dwelling-radio/pkg/utils"
	"dwelling-radio/web"
	"encoding/json"
	"log"
	"net/http"
	"os"
	"time"
)

const FormatISO8601 = "2006-01-02T15:04:05-0700"

type Handlers struct {
	conf *configuration.Configuration
}

func NewHandlers(conf *configuration.Configuration) *Handlers {
	return &Handlers{conf: conf}
}

func (h *Handlers) AssetsFS() http.FileSystem {
	return web.Assets()
}

func (h *Handlers) Index(w http.ResponseWriter, r *http.Request) {
	status, err := radio.IcecastGetStatus(h.conf.Icecast.URL)
	if err != nil {
		log.Println("failed to get Icecast status:", err)
	} else {
		if tim, err := time.Parse(time.RFC1123Z, status.ServerStartDate); err == nil {
			status.ServerStartDate = utils.ToClientTimezone(tim, r).Format(time.RFC1123)
		}

		if tim, err := time.Parse(FormatISO8601, status.ServerStartISO8601); err == nil {
			status.ServerStartISO8601 = utils.ToClientTimezone(tim, r).Format(FormatISO8601)
		}
	}

	songs, err := radio.IcecastLastSongs(h.conf.Icecast.Playlist)
	if err != nil {
		log.Println("cannot retrieve last songs:", err)
	} else {
		for i := 0; i < len(songs); i++ {
			if tim, err := time.Parse(radio.SongTimeFormat, songs[i].Time); err == nil {
				songs[i].Time = utils.ToClientTimezone(tim, r).Format("15:04")
			}
		}
	}

	web.Index(utils.MainSite(r.Host), h.conf.ListLastNSongs, status, &songs, r, w)
}

func (h *Handlers) Status(w http.ResponseWriter, r *http.Request) {
	status, err := radio.IcecastGetStatus(h.conf.Icecast.URL)
	if err != nil {
		log.Println("cannot retrieve Icecast status:", err)
		http.Error(w, "cannot retrieve Icecast status", http.StatusInternalServerError)
		return
	}

	if tim, err := time.Parse(time.RFC1123Z, status.ServerStartDate); err == nil {
		status.ServerStartDate = utils.ToClientTimezone(tim, r).Format(time.RFC1123)
	}

	if tim, err := time.Parse(FormatISO8601, status.ServerStartISO8601); err == nil {
		status.ServerStartISO8601 = utils.ToClientTimezone(tim, r).Format(FormatISO8601)
	}

	w.Header().Add("Content-Type", "application/json")
	json.NewEncoder(w).Encode(status)
}

func (h *Handlers) LastSong(w http.ResponseWriter, r *http.Request) {
	song, err := radio.IcecastLastSong(h.conf.Icecast.Playlist)
	if err != nil {
		log.Println("cannot retrieve last songs:", err)
	}

	if song == nil {
		w.WriteHeader(http.StatusNotFound)
		return
	}

	if tim, err := time.Parse(radio.SongTimeFormat, song.Time); err == nil {
		song.Time = utils.ToClientTimezone(tim, r).Format("15:04")
	}

	w.Header().Add("Content-Type", "application/json")
	json.NewEncoder(w).Encode(song)
}

func (h *Handlers) Playlist(w http.ResponseWriter, _ *http.Request) {
	w.Header().Add("Content-Disposition", "attachment; filename=\"radio.arav.su.m3u\"")
	fc, _ := web.AssetsGetFile("radio.arav.su.m3u")
	w.Write(fc)
}

func (h *Handlers) Filelist(w http.ResponseWriter, _ *http.Request) {
	w.Header().Add("Content-Type", "text/html")
	data, _ := os.ReadFile(h.conf.FilelistPath)
	w.Write(data)
}

func (h *Handlers) RobotsTxt(w http.ResponseWriter, _ *http.Request) {
	w.Header().Add("Content-Disposition", "attachment; filename=\"robots.txt\"")
	w.Write([]byte("User-agent: *\nDisallow: /assets/\nDisallow: /live/"))
}

func Favicon(w http.ResponseWriter, r *http.Request) {
	data, _ := web.AssetsGetFile("img/favicon.svg")
	w.Write(data)
}