using static System.Collections.Specialized.BitVector32;

namespace AdventOfCode.Core.Shared.Grid
{
    /// <summary>
    /// A horizontal line based on the Start Y value.
    /// </summary>
    /// <param name="Start"></param>
    /// <param name="End"></param>
    public class Line(Point start, Point end)
    {
        public Point Start { get; set; } = start;
        public Point End { get; set; } = end;
        public string Value { get; set; } = string.Empty; 

        public Line(Point start, long length) : this(start, new Point (start.X + length - 1, start.Y)) { }
        public Line(Point start, long length, string value) : this(start, length) => Value = value;

        /// <summary>
        /// This intersect assumes that the line horizontal.
        /// Vertical may need to be added later
        /// </summary>
        /// <param name="point">The point search in this line.</param>
        /// <returns></returns>
        public bool Intersect(Point point)
        {
            if (point == null) return false;

            if (point.Y != Start.Y) return false;

            return point.X >= Start.X && point.X <= End.X;
        }

        /// <summary>
        /// This intersect assumes that the line horizontal.
        /// Vertical may need to be added later
        /// </summary>
        /// <param name="line">The line to seach in this line.</param>
        /// <returns></returns>
        public bool Intersect(Line line)
        {
            if (line == null) return false;

            if (line.Start.Y != Start.Y) return false;

            return Intersect(line.Start) // is the start point of the other line in this line
                || Intersect(line.End) // is the end point of the other line in this line
                || (line.Start.X <= Start.X && line.End.X >= End.X); // is this line fully within the other line
        }

        public override string ToString()
        {
            return $"[{Start.Y},{Start.X}] {Value}";
        }
    }
}