using System;

namespace Spectre.Console
{
    /// <summary>
    /// Contains extension methods for <see cref="Calendar"/>.
    /// </summary>
    public static class CalendarExtensions
    {
        /// <summary>
        /// Adds a calendar event.
        /// </summary>
        /// <param name="calendar">The calendar to add the calendar event to.</param>
        /// <param name="date">The calendar event date.</param>
        /// <returns>The same instance so that multiple calls can be chained.</returns>
        public static Calendar AddCalendarEvent(this Calendar calendar, DateTime date)
        {
            return AddCalendarEvent(calendar, string.Empty, date.Year, date.Month, date.Day);
        }

        /// <summary>
        /// Adds a calendar event.
        /// </summary>
        /// <param name="calendar">The calendar to add the calendar event to.</param>
        /// <param name="description">The calendar event description.</param>
        /// <param name="date">The calendar event date.</param>
        /// <returns>The same instance so that multiple calls can be chained.</returns>
        public static Calendar AddCalendarEvent(this Calendar calendar, string description, DateTime date)
        {
            return AddCalendarEvent(calendar, description, date.Year, date.Month, date.Day);
        }

        /// <summary>
        /// Adds a calendar event.
        /// </summary>
        /// <param name="calendar">The calendar to add the calendar event to.</param>
        /// <param name="year">The year of the calendar event.</param>
        /// <param name="month">The month of the calendar event.</param>
        /// <param name="day">The day of the calendar event.</param>
        /// <returns>The same instance so that multiple calls can be chained.</returns>
        public static Calendar AddCalendarEvent(this Calendar calendar, int year, int month, int day)
        {
            return AddCalendarEvent(calendar, string.Empty, year, month, day);
        }

        /// <summary>
        /// Adds a calendar event.
        /// </summary>
        /// <param name="calendar">The calendar.</param>
        /// <param name="description">The calendar event description.</param>
        /// <param name="year">The year of the calendar event.</param>
        /// <param name="month">The month of the calendar event.</param>
        /// <param name="day">The day of the calendar event.</param>
        /// <returns>The same instance so that multiple calls can be chained.</returns>
        public static Calendar AddCalendarEvent(this Calendar calendar, string description, int year, int month, int day)
        {
            if (calendar is null)
            {
                throw new ArgumentNullException(nameof(calendar));
            }

            calendar.CalendarEvents.Add(new CalendarEvent(description, year, month, day));
            return calendar;
        }

        /// <summary>
        /// Sets the calendar's highlight <see cref="Style"/>.
        /// </summary>
        /// <param name="calendar">The calendar.</param>
        /// <param name="style">The highlight style.</param>
        /// <returns>The same instance so that multiple calls can be chained.</returns>
        public static Calendar SetHighlightStyle(this Calendar calendar, Style? style)
        {
            if (calendar is null)
            {
                throw new ArgumentNullException(nameof(calendar));
            }

            calendar.HightlightStyle = style ?? Style.Plain;
            return calendar;
        }
    }
}