let request = require('request-promise-native');
let UserError = require('vn-loopback/util/user-error');
let getFinalState = require('vn-loopback/util/hook').getFinalState;
let isMultiple = require('vn-loopback/util/hook').isMultiple;

module.exports = Self => {
    // Methods
    require('../methods/client/activeWorkersWithRole')(Self);
    require('../methods/client/getCard')(Self);
    require('../methods/client/createWithUser')(Self);
    require('../methods/client/listWorkers')(Self);
    require('../methods/client/hasCustomerRole')(Self);
    require('../methods/client/isValidClient')(Self);
    require('../methods/client/addressesPropagateRe')(Self);
    require('../methods/client/getDebt')(Self);
    require('../methods/client/getMana')(Self);
    require('../methods/client/getAverageInvoiced')(Self);
    require('../methods/client/summary')(Self);
    require('../methods/client/updateFiscalData')(Self);
    require('../methods/client/getTransactions')(Self);
    require('../methods/client/confirmTransaction')(Self);
    require('../methods/client/canBeInvoiced')(Self);

    // Validations

    Self.validatesPresenceOf('street', {
        message: 'Street cannot be empty'
    });

    Self.validatesPresenceOf('city', {
        message: 'City cannot be empty'
    });

    Self.validatesUniquenessOf('fi', {
        message: 'TIN must be unique'
    });

    Self.validatesUniquenessOf('socialName', {
        message: 'The company name must be unique'
    });

    Self.validatesFormatOf('email', {
        message: 'Invalid email',
        allowNull: true,
        allowBlank: true,
        with: /^[\w|.|-]+@[\w|-]+(\.[\w|-]+)*(,[\w|.|-]+@[\w|-]+(\.[\w|-]+)*)*$/
    });

    Self.validatesLengthOf('postcode', {
        allowNull: true,
        allowBlank: true,
        min: 3, max: 10
    });

    Self.validateAsync('iban', ibanNeedsValidation, {
        message: 'The IBAN does not have the correct format'
    });
    let validateIban = require('../validations/validateIban');
    async function ibanNeedsValidation(err, done) {
        let filter = {
            fields: ['code'],
            where: {id: this.countryFk}
        };
        let country = await Self.app.models.Country.findOne(filter);
        let code = country ? country.code.toLowerCase() : null;
        if (code != 'es')
            return done();

        if (!validateIban(this.iban))
            err();
        done();
    }

    Self.validateAsync('fi', tinIsValid, {
        message: 'Invalid TIN'
    });

    let validateTin = require('../validations/validateTin');
    async function tinIsValid(err, done) {
        if (!this.isTaxDataChecked)
            return done();

        let filter = {
            fields: ['code'],
            where: {id: this.countryFk}
        };
        let country = await Self.app.models.Country.findOne(filter);
        let code = country ? country.code.toLowerCase() : null;

        if (!this.fi || !validateTin(this.fi, code))
            err();
        done();
    }

    Self.validate('payMethod', hasSalesMan, {
        message: 'Cannot change the payment method if no salesperson'
    });

    function hasSalesMan(err) {
        if (this.payMethod && !this.salesPerson)
            err();
    }

    Self.validate('isEqualizated', cannotHaveET, {
        message: 'Cannot check Equalization Tax in this NIF/CIF'
    });

    function cannotHaveET(err) {
        let tin = this.fi.toUpperCase();
        let cannotHaveET = /^[A-B]/.test(tin);

        if (cannotHaveET && this.isEqualizated)
            err();
    }

    Self.validateAsync('payMethodFk', hasIban, {
        message: 'That payment method requires an IBAN'
    });

    function hasIban(err, done) {
        Self.app.models.PayMethod.findById(this.payMethodFk, (_, instance) => {
            if (instance && instance.ibanRequired && !this.iban)
                err();
            done();
        });
    }

    Self.validateAsync('bankEntityFk', hasBic, {
        message: 'That payment method requires a BIC'
    });

    function hasBic(err, done) {
        if (this.iban && !this.bankEntityFk)
            err();
        done();
    }

    Self.validateAsync('defaultAddressFk', isActive,
        {message: 'Unable to default a disabled consignee'}
    );

    async function isActive(err, done) {
        if (!this.defaultAddressFk)
            return done();

        const address = await Self.app.models.Address.findById(this.defaultAddressFk);
        if (address && !address.isActive) err();
        done();
    }

    Self.observe('before save', async function(ctx) {
        let changes = ctx.data || ctx.instance;
        let orgData = ctx.currentInstance;
        let finalState = getFinalState(ctx);
        let payMethodWithIban = 4;

        if (changes.salesPerson === null) {
            changes.credit = 0;
            changes.discount = 0;
            changes.payMethodFk = 5; // Credit card
        }

        let payMethodFk = changes.payMethodFk || (orgData && orgData.payMethodFk);
        let dueDay = changes.dueDay || (orgData && orgData.dueDay);

        if (payMethodFk == payMethodWithIban && dueDay == 0)
            changes.dueDay = 5;

        if (isMultiple(ctx)) return;

        if (changes.credit !== undefined) {
            await validateCreditChange(ctx, finalState);
            let filter = {fields: ['id'], where: {userFk: ctx.options.accessToken.userId}};
            let worker = await Self.app.models.Worker.findOne(filter);

            let newCredit = {
                amount: changes.credit,
                clientFk: finalState.id,
                workerFk: worker ? worker.id : null
            };
            await Self.app.models.ClientCredit.create(newCredit);
        }
    });

    Self.observe('after save', async ctx => {
        if (ctx.isNewInstance) return;

        const hookState = ctx.hookState;
        const newInstance = hookState.newInstance;
        const oldInstance = hookState.oldInstance;
        const instance = ctx.instance;

        const payMethodChanged = oldInstance.payMethodFk != newInstance.payMethodFk;
        const ibanChanged = oldInstance.iban != newInstance.iban;
        const dueDayChanged = oldInstance.dueDay != newInstance.dueDay;

        if (payMethodChanged || ibanChanged || dueDayChanged) {
            const message = `La forma de pago del cliente con id ${instance.id} ha cambiado`;
            const salesPersonFk = instance.salesPersonFk;
            const salesPerson = await Self.app.models.Worker.findById(salesPersonFk);

            if (salesPerson) {
                await Self.app.models.Message.send(ctx, {
                    recipientFk: salesPerson.userFk,
                    message: message
                });
            }

            const options = {
                method: 'POST',
                uri: 'http://127.0.0.1:3000/api/email/payment-update',
                body: {
                    clientFk: instance.id
                },
                json: true
            };
            await request(options);
        }
    });

    async function validateCreditChange(ctx, finalState) {
        let models = Self.app.models;
        let userId = ctx.options.accessToken.userId;

        let currentUserIsManager = await models.Account.hasRole(userId, 'manager');
        if (currentUserIsManager)
            return;

        let filter = {
            fields: ['roleFk'],
            where: {
                maxAmount: {gt: ctx.data.credit}
            }
        };

        let limits = await models.ClientCreditLimit.find(filter);

        if (limits.length == 0)
            throw new UserError('Credit limits not found');

        // Si el usuario no tiene alguno de los roles no continua

        let requiredRoles = [];
        for (limit of limits)
            requiredRoles.push(limit.roleFk);

        let where = {
            roleId: {inq: requiredRoles},
            principalType: 'USER',
            principalId: userId
        };
        let count = await models.RoleMapping.count(where);

        if (count <= 0)
            throw new UserError('The role cannot set this credit amount');

        // Si se puso a 0 por gerencia, solo gerencia puede aumentarlo

        let query = 'SELECT * FROM clientCredit WHERE clientFk = ? ORDER BY created DESC LIMIT 1';
        let instances = await Self.rawSql(query, [finalState.id]);

        if (instances.length !== 1 || instances[0].amount > 0)
            return;

        query = `
            SELECT COUNT(*) AS hasRoleManager
                FROM worker em 
                    JOIN account.user ac ON ac.id = em.userFk
                    JOIN salix.RoleMapping rm ON rm.principalId = ac.id
                    JOIN account.role r on r.id = rm.roleId
                WHERE em.id = ?
                    AND rm.principalType = 'USER'
                    AND r.name = 'manager'`;

        let instance = await Self.rawSql(query, [instances[0].workerFk]);

        if (instance[0].hasRoleManager)
            throw new UserError('Only manager can change the credit');
    }
};