const { admin } = require("../firebase/firebase-handler");

const redisSocketEvents = ({
  io,
  redisHelpers: { setSessionData, clearSessionData }, // Note: Used if we persist user to Redis
  ioHelpers: { getBodyshopRoom, getBodyshopConversationRoom },
  logger
}) => {
  // Logging helper functions
  const createLogEvent = (socket, level, message) => {
    logger.log("ioredis-log-event", level, socket?.user?.email, null, { wsmessage: message });
  };

  // Socket Auth Middleware
  const authMiddleware = (socket, next) => {
    try {
      if (socket.handshake.auth.token) {
        admin
          .auth()
          .verifyIdToken(socket.handshake.auth.token)
          .then((user) => {
            socket.user = user;
            // Note: if we ever want to capture user data across sockets
            // Uncomment the following line and then remove the next() to a second then()
            // return setSessionData(socket.id, "user", user);
            next();
          })
          .catch((error) => {
            next(new Error(`Authentication error: ${error.message}`));
          });
      } else {
        next(new Error("Authentication error - no authorization token."));
      }
    } catch (error) {
      logger.log("websocket-connection-error", "error", null, null, {
        ...error
      });
      next(new Error(`Authentication error ${error}`));
    }
  };

  // Register Socket Events
  const registerSocketEvents = (socket) => {
    // Uncomment for further testing
    // createLogEvent(socket, "debug", `Registering RedisIO Socket Events.`);

    // Token Update Events
    const registerUpdateEvents = (socket) => {
      let latestTokenTimestamp = 0;

      const updateToken = async (newToken) => {
        const currentTimestamp = Date.now();
        latestTokenTimestamp = currentTimestamp;

        try {
          // Verify token with Firebase Admin SDK
          const user = await admin.auth().verifyIdToken(newToken, true);

          // Skip outdated token validations
          if (currentTimestamp < latestTokenTimestamp) {
            createLogEvent(socket, "warn", "Outdated token validation skipped.");
            return;
          }

          socket.user = user;

          createLogEvent(socket, "debug", `Token updated successfully for socket ID: ${socket.id}`);
          socket.emit("token-updated", { success: true });
        } catch (error) {
          if (error.code === "auth/id-token-expired") {
            createLogEvent(socket, "warn", "Stale token received, waiting for new token");
            socket.emit("token-updated", {
              success: false,
              error: "Stale token."
            });
            return; // Avoid disconnecting for expired tokens
          }

          createLogEvent(socket, "error", `Token update failed for socket ID: ${socket.id}, Error: ${error.message}`);
          socket.emit("token-updated", { success: false, error: error.message });

          // Optionally disconnect for invalid tokens or other errors
          socket.disconnect();
        }
      };

      socket.on("update-token", updateToken);
    };

    // Room Broadcast Events
    const registerRoomAndBroadcastEvents = (socket) => {
      const joinBodyshopRoom = (bodyshopUUID) => {
        try {
          const room = getBodyshopRoom(bodyshopUUID);
          socket.join(room);
          // createLogEvent(socket, "debug", `Client joined bodyshop room: ${room}`);
        } catch (error) {
          createLogEvent(socket, "error", `Error joining room: ${error}`);
        }
      };

      const leaveBodyshopRoom = (bodyshopUUID) => {
        try {
          const room = getBodyshopRoom(bodyshopUUID);
          socket.leave(room);
          createLogEvent(socket, "debug", `Client left bodyshop room: ${room}`);
        } catch (error) {
          createLogEvent(socket, "error", `Error joining room: ${error}`);
        }
      };

      const broadcastToBodyshopRoom = (bodyshopUUID, message) => {
        try {
          const room = getBodyshopRoom(bodyshopUUID);
          io.to(room).emit("bodyshop-message", message);
          // We do not need this as these can be debugged live
          // createLogEvent(socket, "debug", `Broadcast message to bodyshop ${room}`);
        } catch (error) {
          createLogEvent(socket, "error", `Error getting room: ${error}`);
        }
      };

      socket.on("join-bodyshop-room", joinBodyshopRoom);
      socket.on("leave-bodyshop-room", leaveBodyshopRoom);
      socket.on("broadcast-to-bodyshop", broadcastToBodyshopRoom);
    };

    // Disconnect Events
    const registerDisconnectEvents = (socket) => {
      const disconnect = () => {
        // Uncomment for further testing
        // createLogEvent(socket, "debug", `User disconnected.`);

        const rooms = Array.from(socket.rooms).filter((room) => room !== socket.id);
        for (const room of rooms) {
          socket.leave(room);
        }
        // If we ever want to persist the user across workers
        // clearSessionData(socket.id);
      };

      socket.on("disconnect", disconnect);
    };

    // Messaging Events
    const registerMessagingEvents = (socket) => {
      const joinConversationRoom = async ({ bodyshopId, conversationId }) => {
        try {
          const room = getBodyshopConversationRoom({ bodyshopId, conversationId });
          socket.join(room);
        } catch (error) {
          logger.log("Failed to Join Conversation Room", "error", "io-redis", null, {
            bodyshopId,
            conversationId,
            error: error.message,
            stack: error.stack
          });
        }
      };
      const leaveConversationRoom = ({ bodyshopId, conversationId }) => {
        try {
          const room = getBodyshopConversationRoom({ bodyshopId, conversationId });
          socket.leave(room);
        } catch (error) {
          logger.log("Failed to Leave Conversation Room", "error", "io-redis", null, {
            bodyshopId,
            conversationId,
            error: error.message,
            stack: error.stack
          });
        }
      };

      const conversationModified = ({ bodyshopId, conversationId, ...fields }) => {
        try {
          // Retrieve the room name for the conversation
          const room = getBodyshopRoom(bodyshopId);
          // Emit the updated data to all clients in the room
          io.to(room).emit("conversation-changed", {
            conversationId,
            ...fields
          });
        } catch (error) {
          logger.log("Failed to handle conversation modification", "error", "io-redis", null, {
            error: error.message,
            stack: error.stack
          });
        }
      };

      const messageAdded = ({ bodyshopId, conversationId, message }) => {
        try {
          const room = getBodyshopConversationRoom({ bodyshopId, conversationId });
          io.to(room).emit("new-message", { message, conversationId });
        } catch (error) {
          logger.log("Failed to handle new message", "error", "io-redis", null, {
            error: error.message,
            stack: error.stack
          });
        }
      };

      socket.on("message-added", messageAdded);
      socket.on("conversation-modified", conversationModified);
      socket.on("join-bodyshop-conversation", joinConversationRoom);
      socket.on("leave-bodyshop-conversation", leaveConversationRoom);
    };

    // Call Handlers
    registerRoomAndBroadcastEvents(socket);
    registerUpdateEvents(socket);
    registerMessagingEvents(socket);
    registerDisconnectEvents(socket);
  };

  // Associate Middleware and Handlers
  io.use(authMiddleware);
  io.on("connection", registerSocketEvents);
};

module.exports = {
  redisSocketEvents
};