package smshook

import (
	"encoding/json"
	"net/http"
	"sync"

	"SmsHook/ringbuffer"
)


type WebhookServer struct {
	buffer *ringbuffer.RingBuffer
	cond   *sync.Cond
	mux    *http.ServeMux
}


type WebhookPayload struct {
	Content string `json:"content"`
}


func NewWebhookServer(bufferSize int) *WebhookServer {
	mutex := sync.Mutex{}
	server := &WebhookServer{
		buffer: ringbuffer.NewRingBuffer(bufferSize),
		cond:   sync.NewCond(&mutex),
		mux:    http.NewServeMux(),
	}

	server.mux.HandleFunc("/webhook", server.webhookHandler)
	return server
}


func (s *WebhookServer) webhookHandler(w http.ResponseWriter, r *http.Request) {
	var payload WebhookPayload

	err := json.NewDecoder(r.Body).Decode(&payload)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	s.buffer.Add(payload.Content)
	s.cond.Broadcast()
}


func (s *WebhookServer) GetLastItem() (string, int) {
	return s.buffer.GetLast()
}


func (s *WebhookServer) WaitForNewItem() string {
	s.cond.L.Lock()
	s.cond.Wait()
	newItem := s.buffer.WaitForNewItem()
	s.cond.L.Unlock()
	return newItem
}


func (s *WebhookServer) Start(address string) error {
	return http.ListenAndServe(address, s.mux)
}

var server *WebhookServer


func Init(bufferSize int, address string) {
	server = NewWebhookServer(bufferSize)
	go func() {
		if err := server.Start(address); err != nil {
			panic(err)
		}
	}()
}


func GetLast() (string, int) {
	return server.GetLastItem()
}


func WaitForNew() string {
	return server.WaitForNewItem()
}