/* eslint-disable */
/**
 * @fileOverview Controllers for functions related to payments
 */
'use strict';

const _ = require('lodash');
const Q = require('q');
const debug = require('debug')('integration-api:clients');
const httpStatus = require('http-status-codes');

const config = require(global.configFile);
const mainDB = require(global.pathPrefix + 'mainDB.js');
const utils = require(global.pathPrefix + 'utils.js');
const references = require(global.pathPrefix + '../utils/references.js');
const anon = require(global.pathPrefix + '../utils/anon.js');
const impl = require(global.pathPrefix + '../impl/confirm_transaction.js');
const acquirers = require(global.pathPrefix + '../utils/acquirers/acquirer.js');
const acqErrors = require(global.pathPrefix + '../utils/acquirers/acquirer_errors.js');
const responsesUtils = require(global.pathPrefix + '../utils/responses.js');

const implRedeem = require(global.pathPrefix + '../impl/redeem_paycode.js');
const implGetUpdate = require(global.pathPrefix + '../impl/get_transaction_update.js');

const promClient = require('prom-client');

const counters = {
    takePayment: new promClient.Counter({
        name: 'bridge_server_intapi_takepayment_total',
        help: 'Count of calls to takePayment in the integrations API.',
        labelNames: ['result']
    })
};

module.exports = {
    takePayment,
    redeemPaycode,
    getTransactionUpdate
};

const CLIENT_NOT_OWNED = 'BRIDGE: Client not owned by this merchant';
const FAILED_ADD_ADDRESS = 'BRIDGE: Failed to add billing address';
const DB_ERROR_ADD_ADDRESS = 'BRIDGE: DB failed when adding billing address';
const FAILED_ADD_ACCOUNT = 'BRIDGE: Failed to add account';
const DB_ERROR_ADD_ACCOUNT = 'BRIDGE: DB failed when adding account';
const FAILED_ADD_TRANSACTION = 'BRIDGE: Failed to add transaction';
const DB_ERROR_ADD_TRANSACTION = 'BRIDGE: DB failed when adding transaction';

/**
 * Handler for the takePayment function.
 * This processes a direct card payment
 *
 * @param {Object} req  - the request object
 * @param {Object} res  - the response object
 */
function takePayment(req, res) {
    //
    // To take a direct payment we need to:
    // 1. Check the client was added by the merchant (for security)
    // 2. Add the billing Address if different from residential address
    // 3. Create a client Account (NOT storing encrypted card PAN)
    // 4. Create a Transaction for the payment
    // 5. Process payment (passing in decrypted details rather than getting from account)
    //
    const body = req.swagger.params.body.value;
    const merchant = req.session.data.Merchant;
    const sessionToken = req.session.data.PseudoSession;

    //
    // 1. Find the client, ensuring they were added by this merchant
    //
    const clientP = findClient(body.email, merchant);

    //
    // 2. Add the billing address
    //
    const addressP = clientP.then((client) => addAddress(client, body.cardDetails.BillingAddress));

    //
    // 3. Add the client account
    //
    const accountP = Q.all([clientP, addressP])
        .spread((client, address) => addAccount(client, address, body.cardDetails));

    //
    // 4. Add a transaction
    //
    const transactionP = Q.all([clientP, accountP])
        .spread((client, account) => addTransaction(client, account, merchant, body, sessionToken));

    //
    // 5. Process the transactions
    //
    const resultP = Q.all([clientP, transactionP])
        .spread((client, transaction) => makePayment(client, transaction, body));

    //
    // Response handling
    //
    Q.all([clientP, addressP, accountP, transactionP, resultP]).then((results) => {
        res.status(httpStatus.OK).json({
            TransactionID: results[3]._id.toString()
        });
        counters.takePayment.inc({result: 'success'}, 1, new Date());
    }).catch((error) => {
        debug('Error:', error);

        //
        // Define the responses
        //
        const responses = [
            //
            // Errors when reading from the database
            //
            [
                'MongoError',
                httpStatus.INTERNAL_SERVER_ERROR, 510, 'Database Offline', true
            ],

            //
            // Errors from adding database entries needed for main processing
            //
            [
                CLIENT_NOT_OWNED,
                httpStatus.FORBIDDEN, 999, 'Client not owned by this merchant'
            ],
            [
                FAILED_ADD_ADDRESS,
                httpStatus.INTERNAL_SERVER_ERROR, 999, 'Failed to add billing address'
            ],
            [
                DB_ERROR_ADD_ADDRESS,
                httpStatus.BAD_GATEWAY, 999, 'DB failed when adding billing address'
            ],
            [
                FAILED_ADD_ACCOUNT,
                httpStatus.INTERNAL_SERVER_ERROR, 999, 'Failed to add account'
            ],
            [
                DB_ERROR_ADD_ACCOUNT,
                httpStatus.BAD_GATEWAY, 999, 'DB failed when adding account'
            ],
            [
                FAILED_ADD_TRANSACTION,
                httpStatus.INTERNAL_SERVER_ERROR, 999, 'Failed to add transaction'
            ],
            [
                DB_ERROR_ADD_TRANSACTION,
                httpStatus.BAD_GATEWAY, 999, 'DB failed when adding transaction'
            ],

            //
            // Errors from the main implementation
            //
            [
                impl.ERRORS.MERCHANT_NOT_FOUND,
                httpStatus.FORBIDDEN, 551, 'Merchant information not found'
            ],
            [
                impl.ERRORS.CLIENT_DETAILS_NOT_SET,
                httpStatus.FORBIDDEN, 552, 'User details not set'
            ],
            [
                impl.ERRORS.MERCHANT_DETAILS_NOT_SET,
                httpStatus.FORBIDDEN, 553, 'Merchant details not set'
            ],
            [
                impl.ERRORS.CLIENT_KYC_INCOMPLETE,
                httpStatus.FORBIDDEN, 554, 'Additional customer information required'
            ],
            [
                impl.ERRORS.MERCHANT_KYC_INCOMPLETE,
                httpStatus.FORBIDDEN, 555, 'Additional merchant information required'
            ],
            [
                impl.ERRORS.TRANSACTION_TOTAL_TOO_HIGH,
                httpStatus.BAD_REQUEST, 310, 'Total above current limit'
            ],
            [
                impl.ERRORS.TRANSACTION_TOTAL_TOO_LOW,
                httpStatus.BAD_REQUEST, 311, 'Total below current limit'
            ],
            [
                impl.ERRORS.FAILED_SET_CONFIRMED,
                httpStatus.BAD_GATEWAY, 510, 'Database offline'
            ],
            [
                impl.ERRORS.FAILED_SET_COMPLETE,
                httpStatus.BAD_GATEWAY, 506, 'Database offline'
            ],
            [
                impl.ERRORS.FAILED_ADD_HISTORY,
                httpStatus.BAD_GATEWAY, 507, 'Database offline'
            ],
            [
                impl.ERRORS.FAILED_UPDATE_CUSTOMER_BALANCE,
                httpStatus.BAD_GATEWAY, 508, 'Database offline'
            ],
            [
                impl.ERRORS.FAILED_UPDATE_MERCHANT_BALANCE,
                httpStatus.BAD_GATEWAY, 509, 'Database offline'
            ],
            [
                impl.ERRORS.MERCHANT_ACCOUNT_NOT_FOUND,
                httpStatus.BAD_REQUEST, 497, 'Invalid Merchant AccountID'
            ],
            [
                impl.ERRORS.CUSTOMER_ACCOUNT_NOT_FOUND,
                httpStatus.INTERNAL_SERVER_ERROR, 494, 'Invalid Customer AccountID'
            ],
            [
                impl.ERRORS.MERCHANT_ACCOUNT_NOT_RECEIVING,
                httpStatus.BAD_REQUEST, 498, 'Not a receiving account'
            ],
            [
                impl.ERRORS.CUSTOMER_ACCOUNT_NOT_PAYMENTS,
                httpStatus.INTERNAL_SERVER_ERROR, 495, 'Not a payments account'
            ],

            //
            // Errors from the acquirer
            //
            [
                acqErrors.UNKNOWN_ACQUIRER,
                httpStatus.BAD_REQUEST, 532, 'Merchant acquirer unknown',
                true
            ],
            [
                acqErrors.INVALID_COMBINATION,
                httpStatus.BAD_REQUEST, 536, 'Invalid payment type',
                true
            ],

            [
                acqErrors.ACQUIRER_DOWN,
                httpStatus.BAD_GATEWAY, 533, 'Cannot connect to acquirer',
                true
            ],

            [
                acqErrors.INVALID_MERCHANT_NAME,
                httpStatus.FORBIDDEN, 534, 'Invalid Merchant account details.',
                true
            ],
            [
                acqErrors.INVALID_MERCHANT_ACCOUNT_DETAILS,
                httpStatus.INTERNAL_SERVER_ERROR, 535, 'Receiving account information unreadable',
                true
            ],
            [
                acqErrors.INVALID_CARD_DETAILS,
                httpStatus.INTERNAL_SERVER_ERROR, 536, 'Payment account information unreadable',
                true
            ],

            [
                acqErrors.ACQUIRER_UNKNOWN_ERROR,
                httpStatus.INTERNAL_SERVER_ERROR, 537, 'Error processing payment',
                true
            ],
            [
                acqErrors.ACQUIRER_BAD_REQUEST,
                httpStatus.INTERNAL_SERVER_ERROR, 538, 'Error processing payment',
                true
            ],
            [
                acqErrors.ACQUIRER_INVALID_PAYMENT_DETAILS,
                httpStatus.BAD_REQUEST, 540, 'Invalid payment details',
                true
            ],
            [
                acqErrors.ACQUIRER_UNAUTHORIZED,
                httpStatus.BAD_REQUEST, 541, 'Merchant account unauthorized with acquirer',
                true
            ],
            [
                acqErrors.ACQUIRER_MERCHANT_DISABLED,
                httpStatus.BAD_REQUEST, 542, 'Merchant account disabled with acquirer',
                true
            ],
            [
                acqErrors.ACQUIRER_INTERNAL_SERVER_ERROR,
                httpStatus.BAD_GATEWAY, 543, 'Error processing payment',
                true
            ],

            [
                acqErrors.CARD_EXPIRED,
                httpStatus.FORBIDDEN, 544, 'Card has expired',
                true
            ],
            [
                acqErrors.PAYMENT_FAILED_UNSPECIFIED,
                httpStatus.BAD_REQUEST, 545, 'Unspecified error',
                true
            ]
        ];
        const responseHandler = new responsesUtils.ErrorResponses(responses);
        responseHandler.respond(res, error);
        counters.takePayment.inc({result: 'fail'}, 1, new Date());
    });
}

/**
 * Find the appropriate client and ensure that they have been added by this merchant.
 * If we don't find the client at all, we still respond with CLIENT_NOT_OWNED to
 * avoid leaking anything about whether the email address existing in the service or not.
 *
 * @param {String} email        - the email address of the client
 * @param {Object} merchant     - the merchant object
 * @returns {Promise}           - Promise for the client
 */
function findClient(email, merchant) {
    return references.getClientByEmail(email)
        .then((client) => {
            if (client.OperatorName !== merchant.ClientID) {
                return Q.reject(CLIENT_NOT_OWNED);
            }
            return client;
        })
        .catch((err) => Q.reject(CLIENT_NOT_OWNED));
}

/**
 * Add the billing address. We set the name to "Billing Address" plus a random
 * string to ensure that the name is unique.
 *
 * @param {Object} client       - the client to add the address for
 * @param {Object} addressInfo  - the billing address info from the request
 *
 * @return {Promise}            - a promise for the added address
 */
function addAddress(client, addressInfo) {
    const address = _.clone(addressInfo);
    _.defaults(
        address,
        {
            ClientID: client.ClientID,
            AddressDescription: 'Billing address ' + utils.timeBasedRandomCode(),
            DateAdded: new Date(),
            LastUpdate: new Date()
        },
        mainDB.blankAddress()
    );

    const addP = Q.nfcall(
        mainDB.addObject,
        mainDB.collectionAddresses,
        address,
        {},
        true
    );

    return addP
        .then((objects) => {
            if (objects.length === 0) {
                return Q.reject(FAILED_ADD_ADDRESS);
            } else {
                return objects[0];
            }
        })
        .catch((err) => Q.reject(DB_ERROR_ADD_ADDRESS));
}

/**
 * Adds an account to the database for the transaction that is about to be made.
 * Note that we DO NOT store and actual card details as we can't encrypt them
 * (as we don't have the device key to do so).
 *
 * @param {Object} client       - the client object
 * @param {Object} address      - the billing address that was just added
 * @param {Object} cardDetails  - card details from the request
 * @returns {Promise}           - promise for the added account
 */
function addAccount(client, address, cardDetails) {
    //
    // Build the account structure
    //
    const account = _.defaults(
        {
            ClientID: client.ClientID,
            BillingAddress: address._id.toString(),
            NameOnAccount: cardDetails.NameOnAccount,
            CardPAN: anon.anonymiseCardPAN(cardDetails.CardPAN),
            ClientAccountName: 'Payment details ' + utils.timeBasedRandomCode(),
            AccountType: 'Direct Credit/Debit Card Payment', // Custom type for these transaction types
            ReceivingAccount: 0,
            PaymentsAccount: 1,
            /* jshint -W016 */
            AccountStatus: utils.AccountLocked | utils.AccountApiCreated,
            /* jshint +W016 */
            LastUpdate: new Date()
        },
        mainDB.blankAccount()
    );

    //
    // Tokenise the card with Worldpay to get further details.
    // Need to add in the unencrypted card details so we can tokenise them
    //
    const tokeniseDetails = {
        NameOnAccount: cardDetails.NameOnAccount,
        CardPAN: cardDetails.CardPAN,
        CVV: cardDetails.CardCVV,
        CardExpiry: cardDetails.ExpiryDate,

        // Optional values are undefined
        CardValidFrom: cardDetails.StartDate,
        IssueNumber: cardDetails.IssueNumber
    };

    //
    // CVV name is different in this request than others, so change it
    //
    tokeniseDetails.CVV = tokeniseDetails.CardCVV;
    delete tokeniseDetails.CardCVV;

    //
    // Make the request to tokenise
    //
    const tokeniseP = acquirers.tokeniseCard(config.verificationProvider, tokeniseDetails)
        .then((cardDetails) => {
            //
            // Add the new details on to the card info
            //
            return _.assign(
                {},
                account,
                cardDetails
            );
        });

    //
    // Add the account to the database
    //
    const addP = tokeniseP.then((accountWithDetails) => {
        return Q.nfcall(
            mainDB.addObject,
            mainDB.collectionAccount,
            accountWithDetails,
            {},
            true
        ).then((objects) => {
            if (objects.length === 0) {
                return Q.reject(FAILED_ADD_ACCOUNT);
            } else {
                return objects[0];
            }
        }).catch((err) => Q.reject(DB_ERROR_ADD_ACCOUNT));
    });

    return Q.all([tokeniseP, addP])
        .spread((accountWithDetails, addedAccount) => addedAccount);
}

/**
 * Adds the initial transaction to the database.
 * This uses a new `TransactionStatus` of PENDING_DIRECT_PAYMENT (30) to
 * differentiate these transactions from normal transactions or invoices.
 *
 * @param {Object} client   - the client who is paying
 * @param {Object} account  - the client account to pay from
 * @param {Object} merchant - the merchant to be paid
 * @param {Object} body     - the request body
 * @param {string} sessionToken - a session token for the transaction
 * @returns {Promise}       - a promise for the intialised transaction
 */
function addTransaction(client, account, merchant, body, sessionToken) {
    //
    // Build the transaction structure
    //
    const transaction = _.defaults(
        {
            CustomerAccountID: account._id.toString(),
            CustomerClientID: client.ClientID,
            CustomerDisplayName: client.DisplayName,
            CustomerImage: 'defaultSelfie',
            MerchantDeviceToken: 'IntegrationAPI',
            MerchantSessionToken: sessionToken,
            MerchantAccountID: body.merchantAccount,
            MerchantClientID: merchant.ClientID,
            MerchantDisplayName: merchant.Merchant[0].CompanyAlias,
            MerchantSubDisplayName: merchant.Merchant[0].CompanySubName,
            MerchantImage: merchant.Merchant[0].CompanyLogo,
            MerchantVATNo: merchant.Merchant[0].VATNo || '',
            TransactionStatus: utils.TransactionStatus.PENDING_DIRECT_PAYMENT,
            StatusInfo: 'Transaction for direct payment created',
            RequestAmount: body.amount,
            LastUpdate: new Date()
        },
        mainDB.blankTransaction()
    );

    //
    // Add the transaction to the database
    //
    const addP = Q.nfcall(
        mainDB.addObject,
        mainDB.collectionTransaction,
        transaction,
        {},
        true
    );

    return addP
        .then((objects) => {
            if (objects.length === 0) {
                return Q.reject(FAILED_ADD_TRANSACTION);
            } else {
                return objects[0];
            }
        })
        .catch((err) => Q.reject(DB_ERROR_ADD_TRANSACTION));
}

/**
 * Attempts to make a payment with the provided information.
 *
 * @param {Object} client       - the client who is paying
 * @param {Object} transaction  - the transaction to be paid
 * @param {Object} body         - the request body
 * @return {Promise}            - Promise for the result of confirming the transaction
 */
function makePayment(client, transaction, body) {
    //
    // Build the data to send.  This includes the unencrypted card details from the request
    //
    const cardDetails = buildCardDetails(body.cardDetails);

    const data = {
        TransactionID: transaction._id.toString(),
        TipAmount: 0,
        initialStatus: utils.TransactionStatus.PENDING_DIRECT_PAYMENT,
        cardDetails
    };

    //
    // Need a fake Device as the helper function assume we are coming from a device
    //
    const fakeDevice = mainDB.blankDevice();

    /**
     * Call the base implementation
     */
    return impl.confirmTransaction(client, fakeDevice, data);
}

/**
 * This takes the information provided in the request and turns it into the
 * card details format that we would otherwise get from utils/encryptions.js::decryptCard()
 *
 * @param {Object} cardDetails      - card details from the request
 * @returns {Object}                - card details in the required format
 */
function buildCardDetails(cardDetails) {
    const result = {};

    //
    // Format optional fields
    //
    if (_.isString(cardDetails.IssueNumber)) {
        result.IssueNumber = parseInt(cardDetails.IssueNumber);
    }

    if (_.isString(cardDetails.StartDate)) {
        result.startMonth = cardDetails.StartDate.substr(0, 2);
        result.startYear = '20' + cardDetails.ExpiryDate.substr(3, 2);
    }

    //
    // Format required fields.
    //
    result.expiryMonth = cardDetails.ExpiryDate.substr(0, 2);
    result.expiryYear = '20' + cardDetails.ExpiryDate.substr(3, 2);
    result.cardNumber = cardDetails.CardPAN;

    return result;
}

/**
 * Handler for the redeeemPaycode function.
 *
 * @param {Object} req  - the request object
 * @param {Object} res  - the response object
 */
async function redeemPaycode(req, res) {
    const body = req.swagger.params.body.value;
    const merchant = req.session.data.Merchant;
    const sessionToken = req.session.data.PseudoSession;

    //
    // Need to build the expected object to match the data in the Apps api:
    // @see http://10.0.10.242/w/tricore_architecture/server_interface/payment_commands/redeempaycode/
    //
    // Note that we don't have a device or session token so we just make them up.
    // We also don't have a number of optional fields, so we don't include them
    //
    const request = {
        DeviceToken: 'IntegrationAPI',
        SessionToken: sessionToken,
        PayCode: body.paycode,
        RequestAmount: body.amount,
        RequestTip: 0, // No tips through the integration API
        AccountID: body.merchantAccount,

        //
        // Location not available from the Integration API, so set to null
        //
        Latitude: null,
        Longitude: null
    };
    const responses = [
        [
            '474',
            httpStatus.FORBIDDEN, 474, 'DisplayName is invalid. Please complete customer details'
        ],
        [
            '475',
            httpStatus.FORBIDDEN, 475, 'CompanyAlias is invalid. Please complete merchant details'
        ],
        [
            '476',
            httpStatus.BAD_REQUEST, 476, 'Only Merchants can request a tip'
        ],
        [
            '175',
            httpStatus.BAD_GATEWAY, 175, 'Database offline'
        ],
        [
            '176',
            httpStatus.BAD_REQUEST, 176, 'Invalid paycode'
        ],
        [
            '177',
            httpStatus.BAD_GATEWAY, 177, 'Database offline'
        ],
        [
            '178',
            httpStatus.BAD_GATEWAY, 178, 'Database offline'
        ],
        [
            '179',
            httpStatus.INTERNAL_SERVER_ERROR, 179, 'Invalid TransactionID'
        ],
        [
            '229',
            httpStatus.BAD_GATEWAY, 229, 'Database offline'
        ],
        [
            '276',
            httpStatus.BAD_REQUEST, 276, 'Invalid merchantAccount'
        ],
        [
            '491',
            httpStatus.FORBIDDEN, 491, 'Invalid billing address for merchantAccount'
        ],
        [
            '279',
            httpStatus.BAD_GATEWAY, 279, 'Database offline'
        ],
        [
            '275',
            httpStatus.BAD_REQUEST, 275, 'Deleted merchantAccount'
        ],
        [
            '296',
            httpStatus.BAD_GATEWAY, 296, 'Database offline'
        ],
        [
            '297',
            httpStatus.BAD_REQUEST, 297, 'Account cannot receive payments'
        ],
        [
            '231',
            httpStatus.FORBIDDEN, 231, 'Invalid account image details'
        ],
        [
            '180',
            httpStatus.BAD_GATEWAY, 180, 'Database offline'
        ]
    ];

    //
    // Call the implementation
    //
    try {
        res = await implRedeem.redeemPaycodeP(merchant, request);

        const responseHandler = new responsesUtils.ErrorResponses(responses);
        responseHandler.respond(res, null);
    } catch (error) {
        if (error) {
            const responseHandler = new responsesUtils.ErrorResponses(responses);
            responseHandler.respond(res, error.code);
        }
    }
}

/**
 * Handler for the redeeemPaycode function.
 *
 * @param {Object} req  - the request object
 * @param {Object} res  - the response object
 */
function getTransactionUpdate(req, res) {
    const transactionID = req.swagger.params.TransactionID.value;
    const merchant = req.session.data.Merchant;
    const sessionToken = req.session.data.PseudoSession;

    //
    // Need to build the expected object to match the data in the Apps api:
    // @see http://10.0.10.242/w/tricore_architecture/server_interface/payment_commands/redeempaycode/
    //
    // Note that we don't have a device or session token so we just make them up.
    // We also don't have a number of optional fields, so we don't include them
    //
    const request = {
        DeviceToken: 'IntegrationAPI',
        SessionToken: sessionToken,
        TransactionID: transactionID
    };

    //
    // Call the implementation
    //
    Q.nfcall(implGetUpdate.getTransactionUpdate, request)
        .then((result) => {
            if (result.code === '10019' || result.code === '10021' || result.code === '10029') {
                // Still in progress
                res.status(httpStatus.ACCEPTED).json();
            } else if (result.code === '10024') {
                // Complete succesfully
                res.status(httpStatus.OK).json({
                    CustomerDisplayName: result.CustomerDisplayName,
                    CustomerSubDisplayName: result.CustomerSubDisplayName || undefined,
                    TotalAmount: result.TotalAmount
                });
            } else {
                // Other "successes" would be considered errors here (e.g.
                // Cancelled, Declined, etc.)  So just reject them, and the
                // catch will handle them
                return Q.reject(result);
            }
        })
        .catch((error) => {
            const responses = [

                [
                    '171',
                    httpStatus.BAD_GATEWAY, 171, 'Database offline'
                ],
                [
                    '172',
                    httpStatus.BAD_REQUEST, 172, 'Invalid TransactionID'
                ],
                [
                    '173',
                    httpStatus.BAD_REQUEST, 173, 'Invalid TransactionID' // Wrong API key
                ],
                [
                    '319',
                    httpStatus.BAD_GATEWAY, 319, 'Database offline'
                ],
                [
                    '320',
                    httpStatus.FORBIDDEN, 320, 'Paycode Expired'
                ],
                [
                    '10022',
                    httpStatus.GONE, 10022, error.info  // Covers various errors
                ],
                [
                    '10037',
                    httpStatus.CONFLICT, 10037, 'Transaction refunded'
                ],
                [
                    '234',
                    httpStatus.INTERNAL_SERVER_ERROR, 234, 'Invalid TransactionStatus'
                ]
            ];
            const responseHandler = new responsesUtils.ErrorResponses(responses);
            responseHandler.respond(res, error.code);
        });
}