import { ConsumeMessage } from "amqplib";
import { Request, Response } from "express"
import { SimAlaiUsecases } from "./SimAlai.usecases.js";
import { EventBus } from "sim-shared/domain/EventBus.port.js";
import { Result } from "sim-shared/domain/Result.js";
import { SimEvents } from "sim-shared/domain/SimEvents.js";
import { iccidValidator } from "./httpValidators.js";
import { alaiSimToCommonSim } from "#domain/transformers.js";

type ErrorUsecase = {
  msg: string,
  stackTrace?: string
}

export class SimAlaiController {

  constructor(
    private uscases: SimAlaiUsecases,
    private eventBus: EventBus,
  ) {
  }

  private validateMsg(msg: ConsumeMessage | null) {
    if (msg == undefined) return false;
    const msgData = this.decodeMsg(msg) as SimEvents.general
    if (msgData == undefined || msgData.payload == undefined) throw new Error("Mensaje invalido")
    return msgData;
  }

  private decodeMsg(msg: ConsumeMessage): object | undefined {
    if (msg.content == undefined) {
      console.warn('[Sim.controller] Mensaje vacío');
      return undefined;
    }

    try {
      // Convertir el Buffer a String (UTF-8)
      const contentJson = JSON.parse(Buffer.from(msg.content).toString('utf8'))
      return contentJson;

    } catch (error) {
      console.error('Error al decodificar JSON:', error);
      console.error(Buffer.from(msg.content).toString(("utf8")))
      // Aquí podrías decidir devolver el string crudo o null
      return undefined;
    }
  }


  /**
   * Metodo duplicado se puede generalizar la a una clase sharedController con las funciones basicas
   * TODO: meter un check de 429
   */
  private async tryUseCase<T extends any>
    (msg: ConsumeMessage, usecase: () => Promise<Result<ErrorUsecase, T>>): Promise<Result<ErrorUsecase, T>> {
    try {
      const result = await usecase()
      if (result.error == undefined) {
        await this.eventBus.ack(msg)
        return result
      } else {
        console.error("Error procesando el caso de uso (Alai)", result.error)
        this.eventBus.nack(msg)
        return result
      }
    } catch (e) {
      console.error("Error general procesando el caso de uso (Alai)")
      this.eventBus.nack(msg)
      return {
        error: {
          msg: String(e),
          stackTrace: String(e)
        }
      }
    }
  }

  public activate() {
    return async (msg: ConsumeMessage) => {
      console.log("[i] Evento activate ", msg.fields)
      const data = this.validateMsg(msg) as SimEvents.activation
      const iccid = data.payload.iccid
      const correlation_id = data.headers?.message_id
      const externalId = data.payload.orderId

      const res = await this.tryUseCase(msg, this.uscases.activate({
        iccid: iccid,
        correlation_id: correlation_id,
      }))
      return res;
    }
  }

  public preactivate() {
    return async (msg: ConsumeMessage) => {
      console.log("[i] Evento preactivate ", msg)
      const data = this.validateMsg(msg) as SimEvents.preActivation
      const iccid = data.payload.iccid
      const correlation_id = data.headers?.message_id
      const externalId = data.payload.orderId

      console.log("MSG:", data, data.headers)

      const res = await this.tryUseCase(msg, this.uscases.preactivate({
        iccid: iccid,
        correlation_id: correlation_id,
        externalId: externalId
      }))
      return res;
    }
  }

  public suspend() {
    return async (msg: ConsumeMessage) => {
      console.log("Evento suspend ", msg.fields)
      const data = this.validateMsg(msg) as SimEvents.suspend
      const iccid = data.payload.iccid
      const correlation_id = data.headers?.message_id
      const res = await this.tryUseCase(msg, this.uscases.suspend({
        iccid: iccid,
        correlation_id: correlation_id
      }))
      return res;
    }
  }



  public reActivate() {
    return async (msg: ConsumeMessage) => {
      console.log("Evento reActivate ", msg.fields)
      const data = this.validateMsg(msg) as SimEvents.reActivation
      const iccid = data.payload.iccid
      const correlation_id = data.headers?.message_id
      const res = await this.tryUseCase(msg, this.uscases.reactivate({
        iccid: iccid,
        correlation_id: correlation_id
      }))

      return res;
    }
  }


  public terminate() {
    return async (msg: ConsumeMessage) => {
      console.log("Evento reActivate ", msg.fields, msg)
      const data = this.validateMsg(msg) as SimEvents.reActivation
      const iccid = data.payload.iccid
      const correlation_id = data.headers?.message_id
      const res = await this.tryUseCase(msg, this.uscases.terminate({
        iccid: iccid,
        correlation_id: correlation_id
      }))

      return res;
    }
  }


  /**
  * Select especificamente por REST para evitar pasar por las colas.
  * La respuesta es instantanea no se tiene que registrar como operación.
  */
  public selectREST() {
    return async (req: Request, res: Response) => {
      const { query } = req
      const body = { iccid: query.iccid as string }
      console.log("Evento select", body)
      const validateBody = iccidValidator.validate(body);

      if (validateBody.error != undefined) {
        res.status(422).json(validateBody)
        return;
      }

      const iccid: string | string[] = body.iccid

      if (Array.isArray(iccid)) {
        // TODO: Automatizar la paginacion
        //const usecaseRes = this.uscases.selectMany({ iccid })
      } else {
        //const usecaseRes = await this.uscases.selectOne(iccid)
        const usecaseRes = await this.uscases.selectCompleteSim(iccid)
        if (usecaseRes.error != undefined) {
          res.status(500).json(usecaseRes)
          return;
        } else {
          const { sim, subscription, imei } = usecaseRes.data
          const simData = alaiSimToCommonSim(sim, subscription, imei)
          res.send(simData)
          return;
        }
      }

      res.status(200).json(validateBody)
    }
  }

  /**
    public selectPageREST() {
      return async (req: Request, res: Response) => {
        const { offset, limit, filter, orderBy } = req.query
        const params = {
          offset: (offset != undefined) ? Number(offset) : undefined,
          limit: (limit != undefined) ? Number(limit) : undefined,
          filter: (filter != undefined) ? String(filter) : undefined,
          orderBy: (orderBy != undefined) ? String(orderBy) : undefined
        }
  
        const usecaseRes = await this.uscases.selectPage(params)
  
        if (usecaseRes.error != undefined) {
          res.status(500).json(usecaseRes)
          return;
        } else {
          res.status(200).send(usecaseRes.data)
          return;
        }
      }
    }
    **/
}