namespace KLHZ.Trader.Core.Math.Common
{
    public static class Lines
    {
        public static (decimal x, decimal y) LinesCrossing(decimal k1, decimal b1, decimal k2, decimal b2)
        {
            var x = (b2 - b1) / (k1 - k2);
            var y = k1 * x + b1;

            return (x, y);
        }

        public static bool IsLinesCrossing(DateTime time1, DateTime time2, decimal val1_1, decimal val1_2, decimal val2_1, decimal val2_2)
        {
            var dtime = (decimal)(time2 - time1).TotalSeconds;
            if (dtime == 0) return false;
            var dval1 = val1_2 - val1_1;
            var k1 = dval1 / dtime;
            var b1 = val1_1;

            var dval2 = val2_2 - val2_1;
            var k2 = dval2 / dtime;
            var b2 = val2_1;

            if (k1 != k2)
            {
                var cross = LinesCrossing(k1, b1, k2, b2);
                if (cross.x >= 0 && cross.x <= dtime)
                {
                    var crossingTimestamp = time1.AddSeconds((double)cross.x);
                    return crossingTimestamp >= time1 && crossingTimestamp <= time2;
                }
            }
            return false;
        }
    }
}