import Joi from "joi";
import moment from "moment";

const appointmentTimeSchema = Joi.object().keys({
    date: Joi.date().required(),
    available: Joi.boolean().required()
  });

function isValidEmail(email) {
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    return emailRegex.test(email);
}

function isDueDatePassed(dueDate) {
    return moment(dueDate, 'YYYY-MM-DD', true).isAfter();
}

function isDatePassed(dateA, dateB) {
    const dueDateA = new Date(dateA);
    const dueDateB = new Date(dateB);
    return dueDateA < dueDateB;
}

function isValidAppointmentTimes(data) {
    return data.every(item => {
      try {
        if (!moment(item.date, 'YYYY-MM-DDTHH:mm', true).isValid() || appointmentTimeSchema.validate(item)['error']) {
            return false;
        }
      } catch (e) {
        return false;
      }
      return true;
    });
}

function validateDates(res, startDate, endDate, dueDate) {
    if (isDatePassed(startDate, dueDate)) {
        res.status(400).json({ 'message': 'Due date is after start date' });
        return false;
    }

    if (isDueDatePassed(dueDate)) {
        res.status(400).json({ 'message': 'Due date is in the past' });
        return false;
    }

    if (isDatePassed(endDate, startDate)) {
        res.status(400).json({ 'message': 'End date is before start date' });
        return false;
    }

    return true;
}

export {isValidEmail, isDueDatePassed, isDatePassed, validateDates, isValidAppointmentTimes, appointmentTimeSchema};