package main

import (
	"embed"
	"errors"
	"fmt"
	"log"
	"net"
	"net/http"

	_ "embed"
	"flag"
	"math/rand"

	"github.com/gin-gonic/gin"
	"github.com/olahol/melody"
)

type PlayState = int

const (
	NotPlaying PlayState = iota
	PlayingFallback
	PlayingVideo
)

type State struct {
	VideoProcess ffmpegProcess

	PlayState   PlayState
	CurrentFile string
	Config
	Websocket *melody.Melody

	Users map[net.Addr]WebsocketUserInfo
}

type WebsocketUserInfo struct {
	Username string
	Color    string
}

func (w WebsocketUserInfo) ToWebsocketUser() WebsocketUser {
	return WebsocketUser{
		Username: w.Username,
		Color:    w.Color,
	}
}

type Config struct {
	StreamCacheDir    string
	FallbackFile      string
	MediaFolder       string
	IgnoreHiddenFiles bool

	PublicPort   int
	AdminApiPort int
}

func (s *State) getRandomMediaFile() (foundFile string, err error) {
	var files []string
	files, err = listFilesRecursively(s.MediaFolder, s.IgnoreHiddenFiles)
	if err != nil {
		return
	}

	foundFile = files[rand.Intn(len(files))]
	return
}

func newState(c Config) (state State, err error) {
	state = State{
		Config:    c,
		PlayState: NotPlaying,
		Users:     make(map[net.Addr]WebsocketUserInfo),
	}

	return
}

//go:embed html/*
var embedHTML embed.FS

var ErrMediaFolderNotSpecified = errors.New("Please specify media folder to use")

func parseFlags() (config Config, err error) {
	flag.StringVar(&config.StreamCacheDir, "cache", "stream_cache", "location to dump hls/m3u8 livestream files")
	flag.StringVar(&config.FallbackFile, "fallback", "family_guy_wheel.mp4", "Fallback video that is played when main stream is down")
	flag.StringVar(&config.MediaFolder, "media", "", "Folder to play random media from")
	flag.IntVar(&config.PublicPort, "public_port", 3000, "Port to run public website on")
	flag.IntVar(&config.AdminApiPort, "admin_api_port", 3001, "Port to run admin api on")
	flag.BoolVar(&config.IgnoreHiddenFiles, "hidden_files", true, "Ignores hidden files in random media picking")
	flag.Parse()

	if config.MediaFolder == "" {
		err = ErrMediaFolderNotSpecified
	}

	return
}

func main() {
	config, err := parseFlags()
	if err != nil {
		log.Fatal(err)
	}

	if err = RecreateDir(config.StreamCacheDir); err != nil {
		log.Fatal(err)
	}

	state, err := newState(config)
	if err != nil {
		log.Fatal(err)
	}

	state.setupWebsocket()

	if err = state.playFallback(); err != nil {
		log.Fatal(err)
	}

	public := gin.Default()
	public.GET("/", func(c *gin.Context) {
		ready, err := state.IsLivestreamReady()
		if err != nil {
			c.String(http.StatusInternalServerError, "Something went wrong")
			return
		}

		if ready {
			c.FileFromFS("html/stream.html", http.FS(embedHTML))
		} else {
			c.FileFromFS("html/loading.html", http.FS(embedHTML))
		}
	})

	public.Static("/static", "static")
	public.Static("/media", config.StreamCacheDir)
	public.Any("/ws", func(c *gin.Context) {
		state.Websocket.HandleRequest(c.Writer, c.Request)
	})

	publicAPI := public.Group("/api")
	publicAPI.GET("now_playing", state.NowPlayingAPI)
	publicAPI.GET("is_livestream_ready", state.IsLivestreamReadyAPI)

	private := gin.Default()

	// TODO: autoplay feature that keeps playing random things after current one ends
	privateAPI := private.Group("/api")
	privateAPI.GET("play", state.PlayAPI)
	privateAPI.GET("random", state.PlayRandomAPI)
	privateAPI.GET("stop", state.StopPlayingAPI)
	privateAPI.GET("now_playing", state.NowPlayingAPI)

	fmt.Println("Starting public server on port", fmt.Sprint(config.PublicPort))
	go public.Run(fmt.Sprintf(":%d", config.PublicPort))

	fmt.Println("Starting private server on port", fmt.Sprint(config.AdminApiPort))
	log.Fatal(private.Run(fmt.Sprintf(":%d", config.AdminApiPort)))
}