package handler

import (
	"api/internal/model"
	"api/internal/service"
	"api/internal/storage"
	"api/internal/worker"
	"encoding/json"
	"log/slog"
	"net/http"
	"os"
	"time"

	"github.com/gorilla/websocket"
)

var upgrader = websocket.Upgrader{
	CheckOrigin: func(r *http.Request) bool {
		// todo: change for security
		return true
	},
}

func HandleComputerWebSocket(w http.ResponseWriter, r *http.Request) {
	// Check if user is authorized
	if r.Header.Get("Authorization") != os.Getenv("WEBSOCKET_PASSWORD") {
		w.WriteHeader(http.StatusUnauthorized)
		w.Write([]byte("Unauthorized"))
		return
	}

	// Upgrade to WebSocket connection
	conn, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		slog.Error("Error when upgrading WebSocket connection", slog.Any("error", err))
		return
	}
	defer conn.Close()

	slog.Info("WebSocket connection established")

	// Respond to client pings
	conn.SetPingHandler(func(appData string) error {
		slog.Info("Recieved ping from client")
		return conn.WriteControl(
			websocket.PongMessage,
			[]byte(appData),                // echo back the same data
			time.Now().Add(10*time.Second), // deadline
		)
	})

	// Mark computer online and record the start time for uptime tracking
	service.ComputerData.Online = true
	service.ComputerData.UptimeStart = int(time.Now().Unix())

	for {
		_, message, err := conn.ReadMessage()
		if err != nil {
			slog.Error("WebSocket connection closed by client", slog.Any("error", err))

			// Mark computer offline
			service.ComputerData.Online = false

			// Calculate uptime
			sessionUptime := int(time.Now().Unix()) - service.ComputerData.UptimeStart

			totalUptimeData := storage.GlobalDataStore.Get("uptime")
			var totalUptime float64
			if totalUptimeData != nil {
				totalUptime = totalUptimeData.(float64)
			}

			// Add to totals
			service.ComputerData.Totals.Uptime = totalUptime + float64(sessionUptime)
			storage.GlobalDataStore.Set("uptime", service.ComputerData.Totals.Uptime)

			service.ComputerData.UptimeStart = 0
			break
		}

		var clientMessage model.ComputerWebSocketMessage
		if err := json.Unmarshal(message, &clientMessage); err != nil {
			slog.Error("Error unmarshalling JSON", slog.Any("error", err))
			continue
		}

		worker.QueuedClientMessage = clientMessage
		slog.Info("Recieved message", slog.Any("message", clientMessage))

		// Add to totals
		keysData := storage.GlobalDataStore.Get("keys")
		clicksData := storage.GlobalDataStore.Get("clicks")

		var keys float64
		var clicks float64

		// Convert values (if any) to float64
		if keysData != nil {
			keys = keysData.(float64)
		}
		if clicksData != nil {
			clicks = clicksData.(float64)
		}

		// Add counts from current message to the totals
		storage.GlobalDataStore.Set("keys", keys+float64(clientMessage.Keys))
		storage.GlobalDataStore.Set("clicks", clicks+float64(clientMessage.Clicks))

		service.LoadComputerStatTotals()
	}
}

func HandleComputerGraphData(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(service.ComputerData)
}