import { models } from './models/sequelize.js';
import { v4 as uuidv4 } from 'uuid';
import axios from 'axios';
import moment from 'moment';
import chalk from 'chalk';
import ora from 'ora';

const env = process.env;

/**
 * Gets the Access Token
 * 
 * @param {Boolean} isForce Force to request new token
 */
export async function requestToken(isForce = false) {
	let spinner = ora(`Requesting new token...`).start();
	try {
		const clientConfigData = await models.clientConfig.findOne();
	
		let tokenExpirationDate, token;
		if (clientConfigData) {
			token = clientConfigData.currentToken;
			tokenExpirationDate = clientConfigData.tokenExpiration;
		}

		if (isForce || !token || !tokenExpirationDate || moment().isAfter(tokenExpirationDate)) {
			let clientId, clientSecret
			if (JSON.parse(env.USE_SECRETS_DB)) {
				clientId = clientConfigData.clientId;
				clientSecret = clientConfigData.clientSecret;
			} else {
				clientId = env.CLIENT_ID
				clientSecret = env.CLIENT_SECRET
			};
	
			let data = {
				grant_type: 'client_credentials',
				client_id: clientId,
				client_secret: clientSecret,
				scope: 'role:app catalog:read supply:read organization:read network:write network:read'
			};

			data = Object.keys(data)
				.map(key => `${encodeURIComponent(key)}=${encodeURIComponent(data[key])}`)
				.join('&')

			const headers = { 'Content-Type': 'application/x-www-form-urlencoded' };

			const response = (await vnRequest('POST', env.API_ENDPOINT, data, headers)).data;

			if (response.statusText = 'OK')
				spinner.succeed();
			else {
				spinner.fail();
				criticalError(new Error(`Token request failed with status: ${response.status} - ${response.statusText}`));
			}
			let tokenExpirationDate = moment()
				.add(response.expires_in, 's')
				.format('YYYY-MM-DD HH:mm:ss');
	
			await updateClientConfig(
				clientId,
				clientSecret,
				response.access_token,
				tokenExpirationDate
			);
		} else
			spinner.succeed('Using stored token...');
	} catch (err) {
		spinner.fail();
		throw err;
	}
}

/**
 * Returns the current token
 * 
 * @returns {string}
 */
export async function getCurrentToken() {
	return (await models.clientConfig.findOne()).currentToken;
}

/**
 * Check the floriday data config
 */
export async function checkConfig() {
	const spinner = ora(`Checking config...`).start();

	const excludedEnvVars = ['VSCODE_GIT_ASKPASS_EXTRA_ARGS'];
	const requiredEnvVars = Object.keys(env);
	const filteredEnvVars = requiredEnvVars.filter(reqEnvVar => !excludedEnvVars.includes(reqEnvVar));

	for (const reqEnvVar of filteredEnvVars) {
		if (!process.env[reqEnvVar]) {
			spinner.fail();
			throw new Error(`You haven't provided the ${reqEnvVar} environment variable`);
		}
	}
	const clientConfigData = await models.clientConfig.findOne();
	if (!clientConfigData)
		await updateClientConfig(env.CLIENT_ID,	env.CLIENT_SECRET);

	spinner.succeed();
}
	
/**
 * Returns the expiration of current token
 * 
 * @returns {string}
 */
export async function getCurrentTokenExpiration() {
	return (await models.clientConfig.findOne()).tokenExpiration;
}

/**
 * Updates the access token in the client config table
 * 
 * @param {String} clientId 
 * @param {String} clientSecret 
 * @param {String} accessToken 
 * @param {String} tokenExpirationDate 
 */
export async function updateClientConfig(clientId, clientSecret, currentToken, tokenExpiration) {
		try {
			const spinner = ora(`Updating token...`).start();
			if (!JSON.parse(process.env.USE_SECRETS_DB))
				clientId = clientSecret = null

				await models.clientConfig.upsert({
					id: 1,
					clientId,
					clientSecret,
					currentToken,
					tokenExpiration,
				});
			spinner.succeed();
		} catch (err) {
			spinner.fail();
			throw(err);
		}
}

/**
 * pauses the execution of the script for the given amount of milliseconds
 * 
 * @param {integer} ms 
 * @returns A promise that resolves after ms milliseconds.
 */
export 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 
 */
export 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
 */
export async function syncSequence(current = 0, model = null , maximumSequenceNumber = 0){
	if (model == null && current == 0){
		try {
			const spinner = ora(`Syncing sequence...`).start();
			let mockModels = [
				'supplier',
				'tradeItems',
				'supplyLines',
			];
			let i = 1;
			for (let mockModel in mockModels) {
				spinner.text = `Syncing ${i++} sequences...`
				const element = mockModels[mockModel];
				await syncSequence(0, element);
			}
			spinner.succeed();
		} catch (err) {
			spinner.fail();
			throw new Error(err);
		}
	} else if (current) {
		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}: ${error}`);
		}
	}
}

/**
 * Sync the suppliers
 */
export async function syncSuppliers(){
	let spinner = ora('Preparing to load suppliers...').start();
	try {
		let headers = {
			'Content-Type': 'application/json',
			'Authorization': `Bearer ${await getCurrentToken()}`,
			'X-Api-Key': process.env.API_KEY,
		};

		const maxSequenceNumber = (await vnRequest('GET', `${env.API_URL}/organizations/current-max-sequence`, null, headers)).data;

		let timeFinish, timeToGoSec, timeToGoMin, timeLeft;
		for (let curSequenceNumber = 0; curSequenceNumber <= maxSequenceNumber; curSequenceNumber++) {
			let timeStart = new moment();
			let data = (await vnRequest('GET', `${env.API_URL}/organizations/sync/${curSequenceNumber}?organizationType=SUPPLIER`, null, headers)).data;

			let suppliers = data.results;
			for (let supplier of suppliers) {
				curSequenceNumber = supplier.sequenceNumber;
				spinner.text = `Syncing suppliers, ${maxSequenceNumber - curSequenceNumber} are missing`
				if (timeFinish)
					spinner.text = spinner.text + ` (${timeLeft})`
				await models.supplier.upsert({
					...supplier,
					supplierOrganizationId: supplier.organizationId,
					isConnected: JSON.parse(env.SUPPLIERS_ALWAYS_CONN),
					lastSync: moment(),
				});
			};
			await syncSequence(curSequenceNumber, 'supplier', maxSequenceNumber);
			timeFinish = new moment();
			timeToGoSec = (timeFinish.diff(timeStart, 'seconds') * (maxSequenceNumber - curSequenceNumber) / 1000)
			timeToGoMin = Math.trunc(timeToGoSec / 60)
			if (!timeToGoMin)
				timeLeft = `${Math.trunc(timeToGoSec)} sec`
			else
				timeLeft = `${timeToGoMin} min`
		}
		spinner.text = `Syncing suppliers...`;
		spinner.succeed()
	}
	catch (err) {
		spinner.fail();
		throw new Error(err);
	}
}

/**
 * Create the connections in Floriday
 */
export async function syncConnections(){
	await deleteConnections();
	const spinner = ora(`Creating connections...`).start();
	try {
		let connections = await models.connection.findAll();

		let headers = {
			'Content-Type': 'application/json',
			'Authorization': `Bearer ${await getCurrentToken()}`,
			'X-Api-Key': process.env.API_KEY,
		};
	
		const remoteConnections = (await vnRequest('GET', `${env.API_URL}/connections`, null, headers)).data;

		let i = 1;
		for (let connection of connections) {
			spinner.text = `Creating ${i++} of ${connections.length} connections...`
			let remoteConnection = remoteConnections.find(remoteConnection => remoteConnection == connection.supplierOrganizationId);

			if (!remoteConnection)
				await vnRequest('PUT', `${env.API_URL}/connections/${connection.supplierOrganizationId}`, null, headers);

			await models.connection.update({isConnected: true }, {
				where: {
					supplierOrganizationId: connection.supplierOrganizationId
				}
			});
			await models.supplier.update({ isConnected: true }, {
				where: {
					supplierOrganizationId: connection.supplierOrganizationId
				}
			});
		}
		spinner.succeed();
	} catch (err) {
		spinner.fail();
		throw new Error(err);
	}
}

/**
 * Sync the connections in Floriday
 */
export async function syncTradeItems(){
	const spinner = ora(`Syncing trade items...`).start();
	const suppliers = await models.supplier.findAll({
		where: { isConnected: true }
	});
	let i = 0, x = 1;
	for (let supplier of suppliers) {
		let headers = {
			'Content-Type': 'application/json',
			'Authorization': `Bearer ${await getCurrentToken()}`,
			'X-Api-Key': process.env.API_KEY
		};
		try {
			let tradeItems = (await vnRequest('GET', `${env.API_URL}/trade-items?supplierOrganizationId=${supplier.supplierOrganizationId}`, null, headers)).data
			
			spinner.text = `Syncing ${i} trade items of [${x++}|${suppliers.length}] suppliers...`
			if (!tradeItems.length)	continue;

			for (let tradeItem of tradeItems) {
				await insertItem(tradeItem);
				spinner.text = `Syncing ${i++} trade items of [${x}|${suppliers.length}] suppliers...`
			};
		} catch (err) {
			spinner.fail();
			throw err;
		}
	}
	spinner.succeed()
}

/**
 * Sync the supply lines for suppliers that are connected
 */
export async function syncSupplyLines() {
	const spinner = ora(`(NEW) Syncing supply lines...`).start();
	try {
		let headers = {
			'Content-Type': 'application/json',
			'Authorization': `Bearer ${await getCurrentToken()}`,
			'X-Api-Key': process.env.API_KEY
		};

		let suppliersWithTradeItem = await models.tradeItem.findAll({
			attributes: ['supplierOrganizationId'],
			group: ['supplierOrganizationId']
		});

		let connectedSuppliers = await models.supplier.findAll({
			attributes: ['supplierOrganizationId'],
			where: { isConnected: true }
		});

		let suppliers = suppliersWithTradeItem.filter(supplier => {
			return connectedSuppliers.some(connectedSupplier => {
				return connectedSupplier.supplierOrganizationId === supplier.supplierOrganizationId;
			});
		}).map(supplier => supplier.supplierOrganizationId);

		let i = 0, x = 1;
		for (let supplier of suppliers) {
			spinner.text = `(NEW) Syncing ${i} supply lines of [${x++}|${suppliers.length}] suppliers...`
			const params = new URLSearchParams({
				supplierOrganizationId: supplier,
			}).toString();
			let supplyLines = (await vnRequest('GET',`${env.API_URL}/supply-lines?${params}`, null, headers)).data;
			if (!supplyLines.length) continue

			for (let supplyLine of supplyLines) {

				let tradeItem = await models.tradeItem.findOne({
					where: { tradeItemId: supplyLine.tradeItemId }
				});

				if (!tradeItem) {
					let tradeItem = (await vnRequest('GET', `${env.API_URL}/trade-items?tradeItemIds=${supplyLine.tradeItemId}`, null, headers)).data;
					insertItem(tradeItem[0])
				}

				spinner.text = `(NEW) Syncing ${i++} supply lines of [${x}|${suppliers.length}] suppliers...`
				await models.supplyLine.upsert({
					...supplyLine,
					pricePerPiece_currency: supplyLine.pricePerPiece ? supplyLine.pricePerPiece.currency : null,
					pricePerPiece_value: supplyLine.pricePerPiece ? supplyLine.pricePerPiece.value : null,
					deliveryPeriod_startDateTime: supplyLine.deliveryPeriod ? supplyLine.deliveryPeriod.startDateTime : null,
					deliveryPeriod_endDateTime: supplyLine.deliveryPeriod ? supplyLine.deliveryPeriod.endDateTime : null,
					orderPeriod_startDateTime: supplyLine.orderPeriod ? supplyLine.orderPeriod.startDateTime : null,
					orderPeriod_endDateTime: supplyLine.orderPeriod ? supplyLine.orderPeriod.endDateTime : null,
					agreementReference_code: supplyLine.agreementReference ? supplyLine.agreementReference.code : null,
					agreementReference_description: supplyLine.agreementReference ? supplyLine.agreementReference.description : null,
					lastSync: moment(),
				});

				for (let volumePrice of supplyLine.volumePrices)
					await models.volumePrices.upsert({
						...volumePrice,
						supplyLineId: supplyLine.supplyLineId,
					});
			}
		}
		spinner.succeed();
	}
	catch (err) {
		spinner.fail();
		throw err;
	}
}

/**
 * Insert the trade item
 * 
 * @param {array} tradeItem 
 */
export async function insertItem(tradeItem) {
	let tx;
	try {
		tx = await models.sequelize.transaction();

		// Upsert supplier connection
		await models.connection.upsert({
			supplierOrganizationId: tradeItem.supplierOrganizationId,
		}, { transaction: tx });

		// Upsert trade item
		await models.tradeItem.upsert({
			...tradeItem,
			lastSync: moment(),
		}, { transaction: tx });

		// Upsert characteristics
		if (tradeItem.characteristics)
			if (tradeItem.characteristics.length)
				for (const characteristic of tradeItem.characteristics) {
					await models.characteristic.upsert({
						...characteristic,
						tradeItemId: tradeItem.tradeItemId,
					}, { transaction: tx });
				}
		// Upsert seasonal periods
		if (tradeItem.seasonalPeriods)
			if (tradeItem.seasonalPeriods.length)
				for (const seasonalPeriod of tradeItem.seasonalPeriods) {
					await models.seasonalPeriod.upsert({
						...seasonalPeriod,
						tradeItemId: tradeItem.tradeItemId,
					}, { transaction: tx });
				}

		// Upsert photos
		if (tradeItem.photos)
			if (tradeItem.photos.length)
				for (const photo of tradeItem.photos) {
					await models.photo.upsert({
						...photo,
						tradeItemId: tradeItem.tradeItemId,
					}, { transaction: tx });
				}

		// Upsert packing configurations
		if (tradeItem.packingConfigurations)
			if (tradeItem.packingConfigurations.length)
				for (const packingConfiguration of tradeItem.packingConfigurations) {
					const uuid = uuidv4();

					await models.packingConfiguration.upsert({
						packingConfigurationId: uuid,
						...packingConfiguration,
						additionalPricePerPiece_currency: packingConfiguration.additionalPricePerPiece.currency,
						additionalPricePerPiece_value: packingConfiguration.additionalPricePerPiece.value,
						tradeItemId: tradeItem.tradeItemId,
					}, { transaction: tx });

					await models.package.upsert({
						...packingConfiguration.package,
						packingConfigurationFk: uuid,
					}, { transaction: tx });
				}

		// Upsert country of origin ISO codes
		if (tradeItem.countryOfOriginIsoCodes)
			if (tradeItem.countryOfOriginIsoCodes.length)
				for (const isoCode of tradeItem.countryOfOriginIsoCodes || []) {
					await models.countryOfOriginIsoCode.upsert({
						isoCode,
						tradeItemId: tradeItem.tradeItemId,
					}, { transaction: tx });
				}

		// Upsert botanical names
		if (tradeItem.botanicalNames)
			if (tradeItem.botanicalNames.length)
				for (const botanicalName of tradeItem.botanicalNames) {
					await models.botanicalName.upsert({
						name: botanicalName,
						tradeItemId: tradeItem.tradeItemId,
					}, { transaction: tx });
				}

		await tx.commit();
	} catch (err) {
		await tx.rollback();
		throw err;
	}
}

/**
 * Sync the warehouses
 **/
export async function syncWarehouses(){
	let spinner = ora('Syncing warehouses...').start();
	try {
		let headers = {
			'Content-Type': 'application/json',
			'Authorization': `Bearer ${await getCurrentToken()}`,
			'X-Api-Key': process.env.API_KEY,
		};

		const suppliers = await models.supplier.findAll();
		let x = 0, i = 1;
		for (let supplier of suppliers) {
			spinner.text = `Syncing ${i} warehouses of [${x++}|${suppliers.length}]...`
			const warehouses = (await vnRequest('GET', `${env.API_URL}/organizations/supplier/${supplier.supplierOrganizationId}/warehouses`, null, headers)).data;
			for (let warehouse of warehouses) {
				spinner.text = `Syncing ${i++} warehouses of [${x}|${suppliers.length}]...`
				await models.warehouses.upsert({
					...warehouse,
					supplierOrganizationId: warehouse.organizationId,
					location_gln: warehouse.location.gln,
					location_address_addressLine: warehouse.location.address.addressLine,
					location_address_city: warehouse.location.address.city,
					location_address_countryCode: warehouse.location.address.countryCode,
					location_address_postalCode: warehouse.location.address.postalCode,
					location_address_stateOrProvince: warehouse.location.address.stateOrProvince,
					lastSync: moment(),
				});
			}
		}
	}
	catch (err) {
		spinner.fail();
		throw new Error(err);
	}
}

/**
 * Removes Floriday connections that we don't have in the database
 **/
export async function deleteConnections() {
	const spinner = ora(`Deleting connections that aren't in the db...`).start();
	try {
		let i = 1;
		const headers = {
			'Content-Type': 'application/json',
			'Authorization': `Bearer ${await getCurrentToken()}`,
			'X-Api-Key': process.env.API_KEY
		};

		const connectionsInFloriday = (await vnRequest('GET', `${env.API_URL}/connections`, null, headers)).data;
		const connectionsInDb = await models.connection.findAll();

		let isExists = false, ghostConnections = [];
		for (let connectionInFloriday of connectionsInFloriday) {
			for (let connectionInDb of connectionsInDb)
				if (connectionInFloriday == connectionInDb.supplierOrganizationId) {
					isExists = true;
					break;
				}
			if (!isExists) ghostConnections.push(connectionInFloriday)
			isExists = false;
		}

		for (let connection of ghostConnections) {
			await vnRequest('DELETE', `${env.API_URL}/connections/${connection}`, null, headers);
			spinner.text = `Deleting ${i++} of ${ghostConnections.length} that aren't in the db...`
		}
		spinner.succeed();
	} catch (err) {
		spinner.fail();
		criticalError(err);
	}
}

/**
 * Perform a REST request
 * 
 * @param {string} url 
 * @param {string} method 
 * @param {array} body 
 * @param {array} header 
 * 
 * @return {array}
 **/
export async function vnRequest(method, url, data, headers) {
	for(let i = 0; i < env.MAX_REQUEST_RETRIES; i++) {
	  try {
		if (['GET', 'DELETE'].includes(method))
			return await axios({method, url, headers});
		else
			return await axios({method, url, data, headers});
	  } catch (err) {
		switch (err.code) {
			case 'ECONNRESET': // Client network socket TLS
			case 'EAI_AGAIN': // getaddrinfo
				warning(err);
				await sleep(1000);
				break;
			case 'ECONNABORTED':
			case 'ECONNREFUSED':
			case 'ERR_BAD_REQUEST':
				switch (err.response.status) {
					case 504:
					case 502:
						warning(err);
						await sleep(1000);
						break;
					case 429: // Too Many Requests
						warning(err);
						await sleep(3400); // Stipulated by floryday
						break;
					case 401: // Unauthorized
						warning(err);
						await requestToken(true);
						headers.Authorization ?
							headers.Authorization = `Bearer ${await getCurrentToken()}` :
							criticalError(err);
						break;
					default:
						criticalError(err);
				}
				break;
			default:
				criticalError(err);
		}
	  }
	}
}

/**
 * Critical error
 * 
 * @param {err}
 **/
export async function criticalError(err) {
	console.log(chalk.red.bold(`[CRITICAL]`), chalk.red(`${err.message}`));
	process.exit();
}

/**
 * Warning
 * 
 * @param {err}
 **/
export async function warning(err) {
	console.log(chalk.yellow.bold(`[WARNING]`), chalk.yellow(`${err.message}`));
}