import { Result } from "sim-shared/domain/Result.js";
import { QueryResult } from "pg";
import { PgClient } from "sim-shared/infrastructure/PgClient.js";
import { AxiosError } from "axios";

export type PauseCancelTask = {
  id: number;
  iccid: string;
  operation_type: "suspend" | "terminate",
  last_checked?: Date | null;
  activation_date?: Date | null;
  next_check?: Date | null;
  completed_date?: Date | null;
  error?: string | null;
}

export type CreatePauseCancelTaskDTO = Pick<PauseCancelTask, "iccid" | "activation_date" | "next_check" | "operation_type">
export type UpdatePauseCancelTaskDTO = Pick<PauseCancelTask, "id" | "next_check">
export type FinishPauseCancelTaskDTO = Pick<PauseCancelTask, "id" | "error">

/**
 * Repositorio para compensar los problemas de cacelcaiones/pausas de objenious a 
 * la hora aplicarlo sobre una linea con el billing a test.
 */
export class PauseCancelTaskRepository {
  constructor(
    private readonly pgClient: PgClient
  ) {
  }

  /**
  * Obtiene las siguientes que se pueden lanzar, puede haber más pero 
  * estan pendientes
  */
  public async getPending(): Promise<Result<string, PauseCancelTask[]>> {
    const sql = `
      SELECT * FROM pause_cancel_tasks 
      WHERE completed_date IS NULL 
      AND (next_check <= NOW() OR next_check IS NULL)
      ORDER BY id ASC;
    `;

    try {
      const res: QueryResult<PauseCancelTask> = await this.pgClient.query(sql);
      return {
        data: res.rows
      }
    } catch (e) {
      return {
        error: (e as AxiosError).message
      }
    }
  }

  public async addTask(task: CreatePauseCancelTaskDTO): Promise<Result<string, PauseCancelTask>> {

    const sql = `
      INSERT INTO pause_cancel_tasks (iccid, activation_date, next_check, last_checked, operation_type)
      VALUES ($1, $2, $3, now(), $4)
      RETURNING *;
    `;
    try {
      const values = [task.iccid, task.activation_date, task.next_check, task.operation_type];
      const res: QueryResult<PauseCancelTask> = await this.pgClient.query(sql, values);
      return {
        data: res.rows[0]
      }
    } catch (e) {
      return {
        error: (e as AxiosError).message
      }
    }
  }

  /**
  * Se ha vuelto a comprobar la tarea pero sigue en test
  */
  public async updateTask(updateData: UpdatePauseCancelTaskDTO): Promise<Result<string, PauseCancelTask>> {

    const sql = `
      UPDATE pause_cancel_tasks 
      SET last_checked = now(), next_check = $1 
      WHERE id = $2
      RETURNING *;
    `;
    try {
      const res = await this.pgClient.query<PauseCancelTask>(sql, [updateData.next_check, updateData.id]);
      return {
        data: res.rows[0]
      }
    } catch (e) {
      return {
        error: (e as AxiosError).message
      }

    }
  }


  /**
  * La tarea ha termiando bien o mal
  */
  public async finishTask(finishData: FinishPauseCancelTaskDTO) {
    const sql = `
      UPDATE pause_cancel_tasks 
      SET completed_date = NOW(), error = $1 
      WHERE id = $2
      RETURNING *;
    `;

    try {
      const res = await this.pgClient.query(sql, [finishData.error, finishData.id]);
      return {
        data: res.rows[0]
      }
    } catch (e) {
      return {
        error: (e as AxiosError).message
      }

    }
  }

}