import IO, { Socket, SocketServer } from "../Infrastructure/SocketIO";
import logger from "./Logger";
import AnalyticsBaseModel, {
  AnalyticsBaseModelType,
} from "Common/AnalyticsModels/BaseModel";
import BaseModel, { BaseModelType } from "Common/Models/BaseModel";
import DatabaseType from "Common/Types/BaseDatabase/DatabaseType";
import BadDataException from "Common/Types/Exception/BadDataException";
import { JSONObject } from "Common/Types/JSON";
import JSONFunctions from "Common/Types/JSONFunctions";
import ObjectID from "Common/Types/ObjectID";
import RealtimeUtil, {
  EventName,
  ListenToModelEventJSON,
  ModelEventType,
} from "Common/Utils/Realtime";

export default abstract class Realtime {
  private static socketServer: SocketServer | null = null;

  public static isInitialized(): boolean {
    return this.socketServer !== null;
  }

  public static async init(): Promise<SocketServer | null> {
    if (!this.socketServer) {
      this.socketServer = IO.getSocketServer();
      logger.debug("Realtime socket server initialized");
    }

    this.socketServer!.on("connection", (socket: Socket) => {
      socket.on(EventName.ListenToModalEvent, async (data: JSONObject) => {
        // TODO: validate if this soocket has access to this tenant

        // TODO: validate if this socket has access to this model

        // TODO: validate if this socket has access to this event type

        // TODO: validate if this socket has access to this query

        // TODO: validate if this socket has access to this select

        // validate data

        if (typeof data["eventType"] !== "string") {
          throw new BadDataException("eventType is not a string");
        }
        if (typeof data["modelType"] !== "string") {
          throw new BadDataException("modelType is not a string");
        }
        if (typeof data["modelName"] !== "string") {
          throw new BadDataException("modelName is not a string");
        }
        if (typeof data["query"] !== "object") {
          throw new BadDataException("query is not an object");
        }
        if (typeof data["tenantId"] !== "string") {
          throw new BadDataException("tenantId is not a string");
        }
        if (typeof data["select"] !== "object") {
          throw new BadDataException("select is not an object");
        }

        await Realtime.listenToModelEvent(socket, {
          eventType: data["eventType"] as ModelEventType,
          modelType: data["modelType"] as DatabaseType,
          modelName: data["modelName"] as string,
          query: JSONFunctions.deserialize(data["query"] as JSONObject),
          tenantId: data["tenantId"] as string,
          select: JSONFunctions.deserialize(data["select"] as JSONObject),
        });
      });
    });

    return this.socketServer;
  }

  public static async listenToModelEvent(
    socket: Socket,
    data: ListenToModelEventJSON,
  ): Promise<void> {
    if (!this.socketServer) {
      await this.init();
    }

    const roomId: string = RealtimeUtil.getRoomId(
      data.tenantId,
      data.modelName,
      data.eventType,
    );

    // join the room.
    await socket.join(roomId);
  }

  public static async stopListeningToModelEvent(
    socket: Socket,
    data: ListenToModelEventJSON,
  ): Promise<void> {
    if (!this.socketServer) {
      await this.init();
    }

    // leave this room.
    await socket.leave(
      RealtimeUtil.getRoomId(data.tenantId, data.modelName, data.eventType),
    );
  }

  public static async emitModelEvent(data: {
    tenantId: string | ObjectID;
    eventType: ModelEventType;
    model: BaseModel | AnalyticsBaseModel;
    modelType: { new (): BaseModel | AnalyticsBaseModel };
  }): Promise<void> {
    if (!this.socketServer) {
      await this.init();
    }

    let jsonObject: JSONObject = {};

    if (data.model instanceof BaseModel) {
      jsonObject = BaseModel.toJSON(
        data.model,
        data.modelType as BaseModelType,
      );
    }

    if (data.model instanceof AnalyticsBaseModel) {
      jsonObject = AnalyticsBaseModel.toJSON(
        data.model,
        data.modelType as AnalyticsBaseModelType,
      );
    }

    const roomId: string = RealtimeUtil.getRoomId(
      data.tenantId,
      data.model.tableName!,
      data.eventType,
    );

    this.socketServer!.to(roomId).emit(roomId, jsonObject);
  }
}