package main

import (
	"log"
	"net/http"
	"sync"
	"time"

	"github.com/gorilla/websocket"
)

// WebSocket upgrader
var upgrader = websocket.Upgrader{
	ReadBufferSize:  1024,
	WriteBufferSize: 1024,
	// Allow all origins (CORS)
	CheckOrigin: func(r *http.Request) bool {
		return true
	},
}

var (
	clients   = make(map[*websocket.Conn]bool)
	clientsMu sync.Mutex

	appState   = "idle"
	appStateMu sync.Mutex
)

func websocketHandler(w http.ResponseWriter, r *http.Request) {
	conn, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		log.Println("WebSocket upgrade error:", err)
		return
	}
	defer conn.Close()

	// Register client
	clientsMu.Lock()
	clients[conn] = true
	clientsMu.Unlock()

	log.Println("Client connected")

	// Optionally send initial state
	sendStateToClient(conn)

	for {
		_, _, err := conn.ReadMessage()
		if err != nil {
			break
		}
		// (Ignore incoming messages — or handle if needed)
	}

	// Remove client on disconnect
	clientsMu.Lock()
	delete(clients, conn)
	clientsMu.Unlock()

	log.Println("Client disconnected")
}

func setState(newState string) {
	appStateMu.Lock()
	defer appStateMu.Unlock()

	if appState != newState {
		appState = newState
		//log.Printf("State changed to: %s", newState)
		broadcastState()
	}
}

func broadcastState() {
	clientsMu.Lock()
	defer clientsMu.Unlock()

	for conn := range clients {
		err := conn.WriteJSON(map[string]string{
			"type":  "state_update",
			"state": appState,
			"time":  time.Now().Format(time.RFC3339),
		})
		if err != nil {
			log.Println("Error sending to client, removing:", err)
			conn.Close()
			delete(clients, conn)
		}
	}
}

func sendStateToClient(conn *websocket.Conn) {
	appStateMu.Lock()
	defer appStateMu.Unlock()

	conn.WriteJSON(map[string]string{
		"type":  "state_update",
		"state": appState,
		"time":  time.Now().Format(time.RFC3339),
	})
}