import * as express from 'express';
import { checkSchema, validationResult } from "express-validator";
import {ExportJob, ExportJobsList} from "../interfaces"
import {PROCESSING_TIME_EXPORT} from "../config";
import {exportJobSchema} from "./schema";

class ExportController {
    public path = '/export';
    public router = express.Router();

    private exportJobs: ExportJob[] = [];

    constructor() {
        this.initializeRoutes();
    }

    public initializeRoutes() {
        this.router.get(this.path, this.getAllExportJobs);
        this.router.post(this.path, checkSchema(exportJobSchema), this.addExportJob);
    }

    getAllExportJobs = (request: express.Request, response: express.Response) => {
        const result: ExportJobsList = {
            pending: [],
            finished: []
        };

        this.exportJobs.forEach((exportJob:ExportJob) => {
            if (exportJob.state === "pending"){
                result.pending.push(exportJob);
            }else if (exportJob.state === "finished"){
                result.finished.push(exportJob);
            }
        });

        response.send(result);
    };

    addExportJob = (request: express.Request, response: express.Response) => {
        const validationResultArray = validationResult(request).array();
        if (validationResultArray.length > 0){
            response.status(400).send(validationResultArray);
        }else {
            const receivedExportJob = request.body;
            const fullExportJob: ExportJob = {
                bookId: receivedExportJob.bookId,
                type: receivedExportJob.type,
                state: "pending",
                created_at: new Date(),
                updated_at: new Date()
            };
            this.exportJobs.push(fullExportJob);

            const jobIndexToUpdate: number = this.exportJobs.length - 1;
            const timeout: number = PROCESSING_TIME_EXPORT[fullExportJob.type] * 1000;
            setTimeout((jobIndex: number) => {
                this.exportJobs[jobIndex].state = "finished";
                this.exportJobs[jobIndex].updated_at = new Date();
            }, timeout, jobIndexToUpdate);
            response.send(fullExportJob);
        }
    }
}

export default ExportController;