using System.Collections.Generic;
using System.Drawing;

namespace UseCases
{
    public class UseCase : IDrawable
    {
        /// <summary>
        /// Generate empty useCase
        /// </summary>
        public UseCase()
        {
            Result = "";
            Exceptions = "";
            Discription = "";
            Assumption = "";
            Actors = new List<Actor>();
            Brief = "";
            Name = "";
            Position = new Point();
        }

        /// <summary>
        /// Create new instance of UseCase with specific data
        /// </summary>
        /// <param name="name">The name of the UseCase</param>
        /// <param name="brief">Brief summary of UseCase</param>
        /// <param name="actors">Which actors apply to usecase</param>
        /// <param name="assumption">What is assumed with the usecase</param>
        /// <param name="discription">What happens</param>
        /// <param name="exceptions">What may be different</param>
        /// <param name="result">What is the result</param>
        /// <param name="position">Postion of UseCase on screen</param>
        public UseCase(string name, string brief, List<Actor> actors, string assumption, string discription, string exceptions, string result, Point position)
        {
            Result = result;
            Exceptions = exceptions;
            Discription = discription;
            Assumption = assumption;
            Actors = actors;
            Brief = brief;
            Name = name;
            Position = position;
        }

        public void Draw(Graphics g, Font font, Pen pen)
        {
            //calculate size
            var size = g.MeasureString(Name, font);
            //draw ellipse
            g.DrawEllipse(pen,
                new RectangleF(Utils.TranslatePointF(Position, size.Width / -2f - 5f, size.Height / -2f - 5f),
                    Utils.TranslateSizeF(size, 10f, 10f)));
            //draw text
            g.DrawString(Name, font, Brushes.Black,
                Utils.TranslatePointF(Position, size.Width / -2f, size.Height / -2f));
            var casePosLine = Utils.TranslatePointF(Position, size.Width / -2 - 5f, 0f);
            foreach (var act in Actors)
            {
                //draw line between usecase and actor, if actor doesn't exist use a fake actor at 0,0
                g.DrawLine(pen, casePosLine, act?.Position ?? new Point(0, 0));
            }
        }

        public string Name { get; set; }
        public string Brief { get; set; }
        public List<Actor> Actors { get; set; }
        public string Assumption { get; set; }
        public string Discription { get; set; }
        public string Exceptions { get; set; }
        public string Result { get; set; }
        public Point Position { get; set; }

    }
}