package wsServer

import (
	"context"
	json2 "encoding/json"
	"errors"
	"log"
	"net/http"
	"time"

	"go-socket/packages/Enums/WsEventType"
	"go-socket/packages/cache"
	"go-socket/packages/tokens"
	"go-socket/packages/types"

	"github.com/coder/websocket"
	"github.com/coder/websocket/wsjson"
	"github.com/google/uuid"
)

func ServeWsConnection(responseWriter http.ResponseWriter, request *http.Request) {
	connection, err := websocket.Accept(responseWriter, request, &websocket.AcceptOptions{
		InsecureSkipVerify: true,
	})
	if err != nil {
		log.Printf("websocket accept error: %v", err)
		return
	}

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	var user = types.User{WsConn: connection}
	var isAuthenticated bool
	var ignoreCache bool = true

	defer func() { closeConnection(&user, ignoreCache) }()
	for {
		var userMessage map[string]any
		err = wsjson.Read(ctx, connection, &userMessage)
		if err != nil {
			log.Printf("read error: %v", err)
			return
		}

		if len(userMessage) > 0 {
			if isAuthenticated {
				if !handleAuthenticatedMessage(&user, &userMessage) {
					return
				}
			} else {
				if !handleUnauthenticatedMessage(ctx, &user, &userMessage) {
					ignoreCache = true
					return
				}
				isAuthenticated = true
			}
		}
	}
}

func WsSendMessageCloseIfTimeout(user *types.User, message any) {
	if user.WsConn == nil {
		return
	}

	ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
	defer cancel()

	err := wsjson.Write(ctx, user.WsConn, message)
	if err != nil {
		if errors.Is(err, context.DeadlineExceeded) {
			closeConnection(user, false)
		}
		log.Printf("write error: %v", err)
	}
}

func WsSendMessageToMultipleCloseIfTimeout(users *[]types.User, excludeId uuid.UUID, message any) {

	json, err := json2.Marshal(message)
	if err != nil {
		log.Printf("json marshal error: %v", err)
		json = []byte{}
	}

	for _, user := range *users {
		if user.Id != excludeId {
			WsSendMessageCloseIfTimeout(&user, json)
		}
	}
}

func WsSendEventMessageToPermittedChannelUsersCloseIfTimeout(excluded uuid.UUID, channel *types.HubChannel, needed types.CachedUserPermissions, message any) {
	channel.Mu.RLock()
	permitted := make([]uuid.UUID, 0, len(channel.UsersCachedPermissions))
	for id, perm := range channel.UsersCachedPermissions {
		if id != excluded && perm&needed == needed {
			permitted = append(permitted, id)
		}
	}
	channel.Mu.RUnlock()

	for _, id := range permitted {
		target, err := cache.GetUserById(id)
		if err != nil {
			continue
		}
		WsSendMessageCloseIfTimeout(target, message)
	}
}

// WsSendEventMessageToHubUsersCloseIfTimeout auto fills hubId into message
func WsSendEventMessageToHubUsersCloseIfTimeout(excluded uuid.UUID, hub *types.Hub, message *types.WsHubSpecificHubEventMessage) {
	message.HubId = hub.Id
	hub.Mu.RLock()
	hubUsers := make([]*types.HubUser, 0, len(hub.Users))
	for _, hubUser := range hub.Users {
		if hubUser.OriginalId != excluded {
			hubUsers = append(hubUsers, hubUser)
		}
	}
	hub.Mu.RUnlock()
	for _, hubUser := range hubUsers {
		target, err := cache.GetUserById(hubUser.OriginalId)
		if err != nil {
			continue
		}
		WsSendMessageCloseIfTimeout(target, message)
	}
}

func sendToAllMessageCloseIfTimeout(message *map[string]any) {
	cache.Mu.RLock()
	users := make([]*types.User, 0, len(cache.Users))
	for _, user := range cache.Users {
		users = append(users, user)
	}
	cache.Mu.RUnlock()

	for _, user := range users {
		WsSendMessageCloseIfTimeout(user, message)
	}
}

func handleAuthenticatedMessage(user *types.User, userMessage *map[string]any) bool {
	WsSendMessageCloseIfTimeout(user, userMessage)
	return true
}

func handleUnauthenticatedMessage(ctx context.Context, user *types.User, userMessage *map[string]any) bool {
	token, ok := (*userMessage)["token"].(string)
	response := types.WsEventMessage{Type: WsEventType.Authentication}

	if !ok {
		response.Event = types.WsAuthMessage{
			Success: false,
			Error:   "no token in message",
		}
		WsSendMessageCloseIfTimeout(user, response)
		return false
	}

	userId, err := tokens.TokenValidateGetId(token)
	if err != nil {
		response.Event = types.WsAuthMessage{
			Success: false,
			Error:   "invalid token",
		}
		WsSendMessageCloseIfTimeout(user, response)
		return false
	}

	userFromCache, err := cache.GetUserById(userId)
	if err != nil {
		response.Event = types.WsAuthMessage{
			Success: false,
			Error:   "user not found",
		}
		WsSendMessageCloseIfTimeout(user, response)
		return false
	}

	userFromCache.WsConn = user.WsConn
	*user = *userFromCache

	response.Event = types.WsAuthMessage{
		Success: true,
		Error:   "",
	}
	WsSendMessageCloseIfTimeout(user, response)
	return true
}

func closeConnection(user *types.User, ignoreCache bool) {
	if !ignoreCache {
		cache.DeleteUser(user.Id)
	}
	if user.WsConn != nil {
		user.WsConn.CloseNow()
	}
}