Ghost/ghost/admin/app/validators/offer.js

import BaseValidator from './base';
import validator from 'validator';

export default BaseValidator.create({
    properties: ['name', 'amount', 'displayTitle', 'displayDescription', 'code', 'durationInMonths'],

    name(model) {
        if (!model.name) {
            model.errors.add('name', 'Please enter a name.');
            this.invalidate();
        }
        if (!validator.isLength(model.name || '', 0, 40)) {
            model.errors.add('name', 'Name cannot be longer than 40 characters.');
            this.invalidate();
        }
    },

    amount(model) {
        if (!model.amount) {
            if (model.type === 'trial') {
                model.errors.add('amount', 'Free trial must be at least 1 day.');
            } else {
                model.errors.add('amount', 'Please enter the amount.');
            }

            return this.invalidate();
        }

        if (model.type === 'trial') {
            if (model.amount < 1) {
                model.errors.add('amount', 'Free trial must be at least 1 day.');
                return this.invalidate();
            }

            if (!model.amount.toString().match(/^\d+$/)) {
                model.errors.add('amount', 'Trial days must be a whole number.');
                return this.invalidate();
            }
        }

        if (model.type === 'percent') {
            if (model.amount < 0 || model.amount > 100) {
                model.errors.add('amount', 'Amount must be between 0 and 100%.');
                return this.invalidate();
            }

            if (!model.amount.toString().match(/^\d+$/)) {
                model.errors.add('amount', 'Amount must be a whole number.');
                return this.invalidate();
            }
        }

        if (model.type === 'fixed') {
            if (model.amount < 0) {
                model.errors.add('amount', 'Amount must be greater than 0.');
                return this.invalidate();
            }
        }
    },

    displayDescription(model) {
        if (!validator.isLength(model.displayDescription || '', 0, 191)) {
            model.errors.add('displayDescription', 'Display description cannot be longer than 191 characters.');
            this.invalidate();
        }
    },

    durationInMonths(model) {
        if (model.duration === 'repeating' && !model.durationInMonths) {
            model.errors.add('durationInMonths', 'Please enter the duration in months.');
            this.invalidate();
        }
    },

    code(model) {
        if (!model.code) {
            model.errors.add('code', 'Please enter an offer code.');
            this.invalidate();
        }
    }
});