package rtmp

import (
	"io"
	"net/http"

	"github.com/AlexxIT/go2rtc/internal/api"
	"github.com/AlexxIT/go2rtc/internal/streams"
	"github.com/AlexxIT/go2rtc/pkg/core"
	"github.com/AlexxIT/go2rtc/pkg/flv"
	"github.com/AlexxIT/go2rtc/pkg/rtmp"
	"github.com/AlexxIT/go2rtc/pkg/tcp"
	"github.com/rs/zerolog/log"
)

func Init() {
	streams.HandleFunc("rtmp", streamsHandle)
	streams.HandleFunc("rtmps", streamsHandle)
	streams.HandleFunc("rtmpx", streamsHandle)

	api.HandleFunc("api/stream.flv", apiHandle)
}

func streamsHandle(url string) (core.Producer, error) {
	client, err := rtmp.Dial(url)
	if err != nil {
		return nil, err
	}
	return client, nil
}

func apiHandle(w http.ResponseWriter, r *http.Request) {
	if r.Method != "POST" {
		outputFLV(w, r)
	} else {
		inputFLV(w, r)
	}
}

func outputFLV(w http.ResponseWriter, r *http.Request) {
	src := r.URL.Query().Get("src")
	stream := streams.Get(src)
	if stream == nil {
		http.Error(w, api.StreamNotFound, http.StatusNotFound)
		return
	}

	cons := flv.NewConsumer()
	cons.Type = "HTTP-FLV consumer"
	cons.RemoteAddr = tcp.RemoteAddr(r)
	cons.UserAgent = r.UserAgent()

	if err := stream.AddConsumer(cons); err != nil {
		log.Error().Err(err).Caller().Send()
		return
	}

	h := w.Header()
	h.Set("Content-Type", "video/x-flv")

	_, _ = cons.WriteTo(w)

	stream.RemoveConsumer(cons)
}

func inputFLV(w http.ResponseWriter, r *http.Request) {
	dst := r.URL.Query().Get("dst")
	stream := streams.Get(dst)
	if stream == nil {
		http.Error(w, api.StreamNotFound, http.StatusNotFound)
		return
	}

	client, err := flv.Open(r.Body)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	stream.AddProducer(client)

	if err = client.Start(); err != nil && err != io.EOF {
		log.Warn().Err(err).Caller().Send()
	}

	stream.RemoveProducer(client)
}