var UserError = require('../helpers').UserError;
var getFinalState = require('../helpers').getFinalState;
var isMultiple = require('../helpers').isMultiple;

module.exports = function(Self) {
    // Methods

    require('../methods/client/activate')(Self);
    require('../methods/client/listAddresses')(Self);
    require('../methods/client/card')(Self);
    require('../methods/client/createWithUser')(Self);
    require('../methods/client/listWorkers')(Self);
    require('../methods/client/filter')(Self);
    require('../methods/client/hasCustomerRole')(Self);
    require('../methods/client/isValidClient')(Self);
    require('../methods/client/activeSalesPerson')(Self);
    require('../methods/client/addressesPropagateRe')(Self);

    // Validations

    Self.validatesUniquenessOf('fi', {
        message: 'El NIF/CIF debe ser único'
    });
    Self.validatesUniquenessOf('socialName', {
        message: 'La razón social debe ser única'
    });
    Self.validatesFormatOf('postcode', {
        message: 'El código postal solo debe contener números',
        allowNull: true,
        allowBlank: true,
        with: /^\d+$/
    });
    Self.validatesFormatOf('email', {
        message: 'Correo electrónico inválido',
        allowNull: true,
        allowBlank: true,
        with: /^[\w|-|.]+@[\w|-]+(\.[\w|-]+)*(,[\w|-|.]+@[\w|-]+(\.[\w|-]+)*)*$/
    });
    Self.validatesLengthOf('postcode', {
        allowNull: true,
        allowBlank: true,
        min: 3, max: 10
    });

    var validateIban = require('../validations/validateIban');
    Self.validateBinded('iban', validateIban, {
        message: 'El iban no tiene el formato correcto',
        allowNull: true, // FIXME: Ignored by loopback when it's false
        allowBlank: true
    });

    let validateDni = require('../validations/validateDni');
    Self.validateBinded('fi', validateDni, {
        message: 'DNI Incorrecto'
    });

    Self.validate('payMethod', hasSalesMan, {
        message: 'No se puede cambiar la forma de pago si no hay comercial asignado'
    });
    function hasSalesMan(err) {
        if (this.payMethod && !this.salesPerson)
            err();
    }

    Self.validateAsync('payMethodFk', hasIban, {
        message: 'El método de pago seleccionado requiere que se especifique el IBAN'
    });
    function hasIban(err, done) {
        Self.app.models.PayMethod.findById(this.payMethodFk, (_, instance) => {
            if (instance && instance.ibanRequired && !this.iban)
                err();
            done();
        });
    }

    // Hooks

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

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

        if (changes.payMethodFk !== undefined && changes.dueDay === undefined)
            changes.dueDay = 5;

        if (isMultiple(ctx)) return;

        if (changes.isEqualizated || changes.fi !== undefined) {
            let fiLetter = finalState.fi && finalState.fi.toUpperCase().charAt(0);
            let canMarkEqualizationTax = fiLetter != 'A' && fiLetter != 'B';

            if (finalState.isEqualizated && !canMarkEqualizationTax)
                throw new UserError('Unable to mark the equivalence surcharge');
        }

        if (changes.credit !== undefined) {
            try {
                await validateCreditChange(ctx, finalState);
            } catch (e) {
                throw new UserError('You are not allowed to change the credit');
            }
            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);
        }
    });

    async function validateCreditChange(ctx, finalState) {
        let models = Self.app.models;
        let userId = ctx.options.accessToken.userId;
        let filter = {
            fields: ['roleFk'],
            where: {
                maxAmount: {gt: ctx.data.credit}
            }
        };

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

        if (limits.length == 0)
            throw new Error('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 Error('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].workerFk == userId || instances[0].amount > 0)
            return;

        query = `SELECT COUNT(distinct r.id) > 0 as hasManagerRole 
            FROM clientCredit cc
                JOIN worker em ON em.id = cc.workerFk
                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 rm.principalType = 'USER'
                AND cc.workerFk = ?
                AND r.name = 'manager'`;

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

        if (instance[0].hasManagerRole > 0)
            throw new Error('Only manager can change the credit');
    }
};