import moment from 'moment';
import fetch from 'node-fetch';
import dotenv from 'dotenv';
import { models } from './models/index.js';
//import { v4 as uuidv4 } from 'uuid';
//import cliProgress from 'cli-progress';
import suppliersGln from './suppliersGln.js';
dotenv.config();

/**
 *  The Endpoint where the Access Token is requested
 */
const _accessTokenEndpoint = 'https://idm.staging.floriday.io/oauth2/ausmw6b47z1BnlHkw0h7/v1/token';

const BASE_CUSTOMER_URL = 'https://api.staging.floriday.io/customers-api/2022v2/';

/**
 *  Gets the Access Token from the client config table
 * 
 * @param {sequelize.models} models 
 * @returns {Date} tokenExpirationDate formated as YYYY-MM-DD HH:mm:ss
 */
async function getClientToken() {
    const clientConfigData = await models.clientConfig.findAll();

    const now = moment().format('YYYY-MM-DD HH:mm:ss');
    const tokenExpirationDate = clientConfigData[0].tokenExpiration;

    if (clientConfigData[0].tokenExpiration == null || moment(now).isAfter(tokenExpirationDate)) {
        let clientId = clientConfigData[0].clientId;
        let clientSecret = clientConfigData[0].clientSecret;

        const tokenRequest = await fetch(_accessTokenEndpoint, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/x-www-form-urlencoded',
            },
            body: `grant_type=client_credentials&client_id=${clientId}&client_secret=${clientSecret}&scope=role:app catalog:read supply:read organization:read network:write network:read`,
        });

        const tokenResponse = await tokenRequest.json();

        if (tokenRequest.status === 200) {
            console.log('Token request successful');
        } else {
            throw new Error(
                `Token request failed with status ${tokenRequest.status}`
            );
        }

        const accessToken = tokenResponse.access_token;
        let now = moment().format('YYYY-MM-DD HH:mm:ss');

        let tokenExpirationDate = moment(now)
            .add(tokenResponse.expires_in, 's')
            .format('YYYY-MM-DD HH:mm:ss');

        await updateClientConfig(
            clientId,
            clientSecret,
            accessToken,
            tokenExpirationDate
        );

        return tokenExpirationDate;
    } else {
        console.log('Using the current token...');
        return tokenExpirationDate;
    }
}

/**
 *  Updates the Access Token in the client config table
 * 
 * @param {sequelize.models} models 
 * @param {String} clientId 
 * @param {String} clientSecret 
 * @param {String} accessToken 
 * @param {String} tokenExpirationDate 
 */
async function updateClientConfig(clientId, clientSecret, accessToken, tokenExpirationDate) {
    try {
        console.log('Updating the client config with the new token...');
        await models.clientConfig.upsert({
            id: 1,
            clientId: clientId,
            clientSecret: clientSecret,
            currentToken: accessToken,
            tokenExpiration: tokenExpirationDate,
            requestLimit: 500,
        });
        console.log('Client config updated, new Token set');
        console.log('New token expiration date: ', tokenExpirationDate);
    } catch (error) {
        console.log('There was a error while updating the client config');
        console.log(error);
    }
}

/**
 * returns the current Access Token
 * 
 * @returns 
 */
async function getJWT() {
    const clientConfigData = await models.clientConfig.findAll();
    return clientConfigData[0].currentToken;
}

/**
 * pauses the execution of the script for the given amount of milliseconds
 * 
 * @param {integer} ms 
 * @returns A promise that resolves after ms milliseconds.
 */
async function sleep(ms) {
    return new Promise((resolve) => {
        setTimeout(resolve, ms);
    });
}

/**
 * Recieves an array of functions and executes them in a queue with the given concurrency
 * 
 * @param {Array} fnArray 
 * @param {Number} concurrency 
 * @returns 
 */
async function asyncQueue(fnArray, concurrency = 1) {

    const results = []; // 1

    const queue = fnArray.map((fn, index) => () => fn().then((result) => results[index] = result));

    const run = async () => { // 2
        const fn = queue.shift();
        if (fn) {
            await fn();
            await run();
        }
    };

    const promises = []; // 3
    while (concurrency--) { // 4
        promises.push(run());
    }

    await Promise.all(promises); // 5 

    return results;

}
// 1. Create an array of functions that will be executed in a queue
// 2. Create a function that will execute the functions in the queue
// 3. Create an array of promises that will execute the run function
// 4. Execute the run function while the concurrency is greater than 0
// 5. Return the results

/**
 * Syncs the sequence number for the given model
 * if no params are given it will reset all the sequence number to 0
 * 
 * @param {Number} current - current sequence number
 * @param {String} model - model name
 * @param {Number} maximumSequenceNumber - maximum sequence number
 * @returns
 */
async function syncSequence(current = 0, model = null ,maximumSequenceNumber = 0){
    if (model == null && current == 0){
     
        let mockModels = ['suppliers','tradeItems','supplyLines',];

        for (let i = 0; i < mockModels.length; i++) {
            const element = mockModels[i];
            console.log('Syncing sequence for: ', element);
            await syncSequence(0, element);
        }

    } else {

        let tx = await models.sequelize.transaction();
    
        try {

            let sequence = await models.sequenceNumber.findOrCreate({
                where: {
                    model: model
                },
                defaults: {
                    model: model,
                    sequenceNumber: current,
                    maximumSequenceNumber: maximumSequenceNumber
                },
                transaction: tx
            });

            if (sequence[1] == false){
                await models.sequenceNumber.update({
                    sequenceNumber: current,
                    maximumSequenceNumber: maximumSequenceNumber
                }, {
                    where: {
                        model: model
                    },
                    transaction: tx
                });
            }

            await tx.commit();

        } catch (error) {
            await tx.rollback();
            console.log('Error while syncing sequence number for: ', model);
        }
    }
}

async function syncSuppliers(){

    let headers = {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${await getJWT()}`,
        'X-Api-Key': process.env.API_KEY
    };
    
    let rFloraHolland = suppliersGln.floraholland;

    let queryMaxSeqNumber = `${BASE_CUSTOMER_URL}organizations/current-max-sequence`;

    let responseMaxSequence = await fetch(queryMaxSeqNumber, {
        method: 'GET',
        headers: headers
    });

    let dataMaxSequence  = await responseMaxSequence.json();

    console.log('Maximum sequence number: ', dataMaxSequence);
    
}

async function syncTradeItems(){

    let suppliers = await models.suppliers.findAll({
        where: {
            isConnected: true
        }
    });
    
    let headers = {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${await getJWT()}`,
        'X-Api-Key': process.env.API_KEY
    };

    for (let i = 0; i < suppliers.length; i++) {
        
        let queryMaxSequence = `${BASE_CUSTOMER_URL}trade-items/current-max-sequence`;
        
        let responseMaxSequence = await fetch(queryMaxSequence, {
            method: 'GET',
            headers: headers
        });

        let maximumSequenceNumber = await responseMaxSequence.json();

        await syncSequence(0, 'tradeItems', maximumSequenceNumber);
        
        let currentSequence = await models.sequenceNumber.findOne({
            where: {
                model: 'tradeItems'
            }
        });

        currentSequence = currentSequence.sequenceNumber;

        let estimatedIterations = Math.ceil(maximumSequenceNumber / 1000);
        
        let supplier = suppliers[i];

        console.log('Syncing trade items for: ', supplier.name);
        console.log('Supplier Id: ', supplier.organizationId);
        console.log('Current sequence number: ', currentSequence);
        console.log('Maximum sequence number: ', maximumSequenceNumber);
        console.log('Estimated iterations: ', estimatedIterations);

        for (let j = 0; j < estimatedIterations; j++) {
        
            let query = `${BASE_CUSTOMER_URL}trade-items/sync/${currentSequence}?supplierOrganizationId=${supplier.organizationId}&limit=1000`;
            
            let request = await fetch(query, {
                method: 'GET',
                headers: headers
            });

            let itemdata = await request.json();

            let results = itemdata.results;

            if (results.length == 0) {
                console.log('No more trade items to sync');
                break;
            }

        }
    }
}

export { getClientToken, updateClientConfig, getJWT, sleep, asyncQueue, syncSequence, syncSuppliers, syncTradeItems };