using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Azimuth;
using Slipstream.StokesFlow;

namespace Slipstream.UnitTests.StokesFlow
{
    public class StokesletGroupTests : UnitTestSharp.TestFixture
    {
        public void Double_NormalFlow()
        {
            var points = new List<Vector> {
                new Vector(0, 1),
                new Vector(0, -1)
            };
            var freeStreamVelocity = new Vector(1, 0);
                
            var group = new StokesletGroup(points);
            group.EnforceBoundaryConditions(freeStreamVelocity);
            foreach (var point in points)
            {
                CheckEqual(Vector.Zero, group.VelocityAtPoint(point) + freeStreamVelocity);
            }
        }

        public void Double_TangentFlow()
        {
            var points = new List<Vector> {
                new Vector(0, 1),
                new Vector(0, -1)
            };
            var freeStreamVelocity = new Vector(0, 1);

            var group = new StokesletGroup(points);
            group.EnforceBoundaryConditions(freeStreamVelocity);
            foreach (var point in points)
            {
                CheckEqual(Vector.Zero, group.VelocityAtPoint(point) + freeStreamVelocity);
            }
        }

        public void MockPanel()
        {
            var points = new List<Vector> {
                new Vector(0, 2),
                new Vector(0, 1),
                new Vector(0, 0),
                new Vector(0, -1),
                new Vector(0, -2)
            };
            var freeStreamVelocity = new Vector(1, 0);

            var group = new StokesletGroup(points);
            group.EnforceBoundaryConditions(freeStreamVelocity);
            foreach (var point in points)
            {
                CheckEqual(Vector.Zero, group.VelocityAtPoint(point) + freeStreamVelocity);
            }
        }
    }
}