openerp.eiru_invoice_status_change = function(instance, local) {

    local.widgetInstance = null;
    local.parentInstance = null;

    local.PayslipGeneratorWidget = instance.Widget.extend({
        id: undefined,

        init: function(parent) {
            this._super(parent);
        },
        /**
         * [checkState]
         */
        checkState: function(id) {
            var self = this;
            self.id = id;
        
            if (id)
                self.fectchInitial();
        },
        /**
         * [fectchInitial]
         */
        fectchInitial: function() {
            var self = this;
            self.fectchInvoice(self.id).then(function(accountInvoice) {
                return accountInvoice;
            }).then(function(accountInvoice) {
                if (!accountInvoice.length)
                    return false
                return self.updateInvoiceState(accountInvoice.shift());
            }).then(function(update){
                if (update)
                    return self.reloadPage()
            })
        },
        /**
         * [fectchInvoice]
         */
        fectchInvoice: function(id) {
            var invoice = new instance.web.Model('account.invoice');
            var fields = ['id','name','residual', 'state'];
            var domain = [['id', '=', id],['state', 'in', ['open', 'paid']]];
            return invoice.query(fields).filter(domain).all();
        },
        /**
         * [updateInvoiceState]
         */
        updateInvoiceState: function(invoice) {
            if (invoice.residual <= 0 && invoice.state === 'paid')
                return
            if (invoice.residual > 0 && invoice.state === 'open')
                return

            var invoiceUpdate = new instance.web.Model('account.invoice');
            return invoiceUpdate.call('update_invoice_state',[invoice.id], {
                context: new instance.web.CompoundContext()
            })
        },
        /**
         * [reloadPage]
         */
        reloadPage: function() {
             local.parentInstance.reload();
        },
    });

    if (instance.web && instance.web.FormView) {
        instance.web.FormView.include({
            load_record: function(record) {
                this._super.apply(this, arguments);

                if (this.model !== 'account.invoice')
                    return;

                local.parentInstance = this;

                if (local.widgetInstance) {
                    local.widgetInstance.checkState(record.id);
                    return
                }

                local.widgetInstance = new local.PayslipGeneratorWidget(this);
                local.widgetInstance.checkState(record.id);

            }
        });
    }
}