module.exports = function(Client) {
    // Validations

    Client.validatesUniquenessOf('name', {message: 'El nombre debe ser unico'});
    Client.validatesUniquenessOf('fi', {message: 'El nif/cif debe ser unico'});
    Client.validatesPresenceOf('socialName', {message: 'Debe especificarse la razón social'});
    Client.validatesFormatOf('postcode', {allowNull: true, with: /^\d+$/, message: 'El código postal solo debe contener números'});
    Client.validatesLengthOf('postcode', {allowNull: true, min: 3, max: 10});
    Client.validatesFormatOf('email', {allowNull: true, with: /^[\w|\.|\-]+@\w[\w|\.|\-]*\w$/, message: 'Correo electrónico inválido'});

    Client.validate('payMethod', hasCC, {message: 'Introduzca el iban del cliente'});
    function hasCC(err) {
        if (this.payMethod == 2 && !this.iban) err();
    };

    Client.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();
    };

    // Hooks

    Client.observe('before save', function(ctx, next) { 
        if(ctx.instance) {
            if (!ctx.instance.dueDay){
                ctx.instance.dueDay = 5;
            }
            next();
        }
        else {
             Client.findById(ctx.where.id,
                function(err, item) {
                    if (!err) {
                        if (item.payMethod != ctx.data.payMethod && item.dueDay == ctx.data.dueDay) {
                            ctx.data.dueDay = 5;
                        }
                    }
                    next();
                }
            );
        }
    });

    // Methods

    Client.remoteMethod('activate', {
        description: 'Activate or deactive client',
        accepts: {
            arg: 'id',
            type: 'number',
            required: true,
            http: function(ctx) {
                var id = ctx && ctx.req && ctx.req.params.id
                return id;
            }
        },
        returns: {
            arg: 'active', 
            type: 'boolean'
        },
        http: {
            path: '/:id/activate',
            verb: 'put'
        }
    });
    
    Client.activate = function(id, cb) {
        Client.findById(id, function(err, client) {
            if(!err) {
                Client.update({id: client.id}, {active: !client.active}); 
                cb(null, !client.active);
            }
        }) 
    };

    // Filters

    let Model = Client;
    let fields = {
        id: false,
        fi: false,
        name: true,
        socialName: true,
        city: true,
        postcode: false,
        email: true,
        phone: false
    };

    Model.remoteMethod('filter', {
        description: 'List items using a filter',
        accessType: 'READ',
        accepts: {
            arg: 'filter',
            type: 'object',
            description: 'Filter defining where'
        },
        returns: {
            arg: 'data', 
            type: 'Client',
            root: true
        },
        http: {
            path: '/filter',
            verb: 'get'
        }
    });
    
    Model.filter = function(filter, cb) {
        filter = removeEmpty(filter);
        let where = {};

        if(filter)
        for (let field in fields)
        if(filter[field]) {
            if(fields[field])
                where[field] = {ilike: filter[field]};
            else
                where[field] = filter[field];
        }

        Model.find({where: where}, function(err, instances) {
            if(!err) {
                cb(null, instances);
            }
        }) 
    };

    function removeEmpty(o) {
        if(Array.isArray(o)) {
            let array = [];
            for(let item of o) {
                let i = removeEmpty(item);
                if(!isEmpty(item))
                    array.push(item);
            };
            if(array.length > 0)
                return array;
        }
        else if (typeof o === 'object') {
            let object = {};
            for(let key in o) {
                let i = removeEmpty(o[key]);
                if(!isEmpty(i))
                    object[key] = i;                
            }
            if(Object.keys(object).length > 0)
                return object;
        }
        else if (!isEmpty(o))
            return o;

        return undefined;
    }

    function isEmpty(value) {
        return value === undefined || value === "";
    }
};