package main

import (
	"bufio"
	"fmt"

	c "live-streamer/config"
	"live-streamer/constant"
	"live-streamer/logger"
	"live-streamer/server"
	"live-streamer/streamer"
	"live-streamer/utils"
	"live-streamer/websocket"

	"os"

	"github.com/fsnotify/fsnotify"
	"go.uber.org/zap"
)

var (
	GlobalStreamer *streamer.Streamer
	log            *zap.Logger
	config         *c.Config
)

func init() {
	config = c.GlobalConfig
	log = logger.GlobalLogger
}

func main() {
	fmt.Println("Version: " + constant.Version)

	if !utils.HasFFMPEG() {
		log.Fatal("ffmpeg not found")
	}

	server.NewServer(config.Server.Addr, websocket.RequestHandler)
	server.GlobalServer.Run()

	GlobalStreamer = streamer.NewStreamer(config.VideoList)

	go startWatcher()
	go inputHandler()

	GlobalStreamer.Start()
	select {}
}

func inputHandler() {
	scanner := bufio.NewScanner(os.Stdin)
	for scanner.Scan() {
		line := scanner.Text()
		switch line {
		case "list":
			fmt.Println(GlobalStreamer.GetVideoListPath())
		case "index":
			fmt.Println(GlobalStreamer.GetCurrentIndex())
		case "next":
			GlobalStreamer.Next()
		case "prev":
			GlobalStreamer.Prev()
		case "quit":
			GlobalStreamer.Close()
		case "current":
			fmt.Println(GlobalStreamer.GetCurrentVideoPath())
		}
	}
}

func startWatcher() {
	watcher, err := fsnotify.NewWatcher()
	if err != nil {
		log.Fatal("failed to create watcher", zap.Error(err))
	}
	defer watcher.Close()
	for _, item := range config.InputItems {
		if item.ItemType == "dir" {
			err = watcher.Add(item.Path)
			if err != nil {
				log.Fatal("failed to add dir to watcher", zap.Error(err))
			}
			log.Info("watching dir", zap.String("path", item.Path))
		}
	}
	if err != nil {
		log.Fatal("failed to start watcher", zap.Error(err))
	}

	for {
		select {
		case event, ok := <-watcher.Events:
			if !ok {
				return
			}
			if event.Op&fsnotify.Create == fsnotify.Create {
				if utils.IsSupportedVideo(event.Name) {
					log.Info("new video added", zap.String("path", event.Name))
					GlobalStreamer.Add(event.Name)
				}
			}
			if event.Op&fsnotify.Remove == fsnotify.Remove {
				log.Info("video removed", zap.String("path", event.Name))
				GlobalStreamer.Remove(event.Name)
			}
		case err, ok := <-watcher.Errors:
			if !ok {
				return
			}
			log.Error("watcher error", zap.Error(err))
		}
	}
}