using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Numerics;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using NaturalNeighbor;

namespace TestNeighborInterpolator
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        /// <summary>
        /// 执行计算.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
        private void btnOK_Click(object sender, EventArgs e)
        {
            string strFile = "C:\\GeoIntelligent\\Test\\厚度图数据\\39SO(300).csv";
            string strResult = "C:\\GeoIntelligent\\Test\\厚度图数据\\39SO(300)-Result.csv";
            IEnumerable<Vector3> points = this.ReadData(strFile);
            Interpolator2d interpolator = Interpolator2d.Create(points.ToArray(), 0.5);
            Vector2 minLoc = interpolator.MinValue.Value;
            Vector2 maxLoc = interpolator.MaxValue.Value;

            double dWidth = maxLoc.X - minLoc.X;
            double dHeight = maxLoc.Y - minLoc.Y;
            int nCols = 200;
            int nRows = 200;
            double scaleX = dWidth / (nCols - 1);
            double scaleY = dHeight / (nRows - 1);
            float dScale = (float)Math.Min(scaleX, scaleY);

            int nCalCols = (int)Math.Floor(dWidth / dScale);
            int nCalRows = (int)Math.Floor(dHeight / dScale);
            Vector2[] result = new Vector2[nCalRows * nCalCols];
            for (int i = 0; i < nCalRows; ++i)
            {
                var x = minLoc.X + i * dScale;

                for (int j = 0; j < nCalCols; ++j)
                {
                    var y = minLoc.Y + j * dScale;
                    result[i * nCalCols + j] = new Vector2(x, y);
                }
            }
            double[] resultZ = new double[nCalRows * nCalCols];
            interpolator.LookupRange(result, resultZ);
            using (StreamWriter sw = new StreamWriter(strResult, false, Encoding.Default))
            {
                for (int i = 0; i < nCalRows; i++)
                {
                    for (int j = 0; j < nCalCols; j++)
                    {
                        sw.WriteLine($"{result[i * nCalCols + j].X},{result[i * nCalCols + j].Y},{resultZ[i * nCalCols + j]}");
                    }
                }
            }
            MessageBox.Show("OK");
            //string strFile = "C:\\GeoIntelligent\\Test\\厚度图数据\\39SO(300).csv";
            //string strResult = "C:\\GeoIntelligent\\Test\\厚度图数据\\39SO(300)-Result.csv";
            //IEnumerable<Vector3> points = this.ReadData(strFile);

            //Vector3 rangeMin = new Vector3();
            //Vector3 rangeMax = new Vector3();
            ////this.CalculateRange(points.ToArray(), ref rangeMin, ref rangeMax);

            //Interpolator2d interpolator = Interpolator2d.Create(points.ToArray(), 0.5);
            //Vector2 minLoc = interpolator.MinValue.Value;
            //Vector2 maxLoc = interpolator.MaxValue.Value;

            //double dWidth = maxLoc.X - minLoc.X;
            //double dHeight = maxLoc.Y - minLoc.Y;
            //int nCols = 200;
            //int nRows = 200;
            //double scaleX = dWidth / (nCols - 1);
            //double scaleY = dHeight / (nRows - 1);
            //float dScale = (float)Math.Min(scaleX, scaleY);

            //int nCalCols = (int)Math.Floor(dWidth / dScale);
            //int nCalRows = (int)Math.Floor(dHeight / dScale);
            //// 生成网格文件
            //Vector2[] result = new Vector2[nCalRows * nCalCols];
            //for (int i = 0; i < nCalCols; ++i)
            //{
            //    var x = minLoc.X + i * dScale;
            //    for (int j = 0; j < nCalRows; ++j)
            //    {
            //        var y = minLoc.Y + j * dScale;
            //        result[i * nCalRows + j] = new Vector2(x, y);
            //    }
            //}
            //double[] resultZ = new double[nCalRows * nCalCols];
            //interpolator.LookupRange(result, resultZ);

            //SetGridData(rangeMin.X, rangeMin.Y, resultZ, nCalCols, nCalRows, (double)dScale, (double)dScale
            //    , rangeMin.Z, rangeMax.Z, null, 0);
            //DestoryXy();
            ///*            
            ////using (StreamWriter sw = new StreamWriter(strResult, false, Encoding.Default))
            ////{
            ////    for (int i = 0; i < nCalRows; i++)
            ////    {
            ////        for (int j = 0; j < nCalCols; j++)
            ////        {
            ////            sw.WriteLine($"{result[i * nCalCols + j].X},{result[i * nCalCols + j].Y},{resultZ[i * nCalCols + j]}");
            ////        }
            ////    }
            ////}*/
            //MessageBox.Show("OK");
        }
        private IEnumerable<Vector3> ReadData(string filename)
        {
            using (StreamReader txt = new StreamReader(File.Open(filename, FileMode.Open)
                , Encoding.Default))
            {
                txt.ReadLine(); // Skip columns

                var s = txt.ReadLine();
                while (s != null)
                {
                    var parts = s.Split(',');
                    if (parts.Length == 3 &&
                        double.TryParse(parts[0], out var x) &&
                        double.TryParse(parts[1], out var y) &&
                        double.TryParse(parts[2], out var z))
                    {
                        yield return new Vector3((float)x, (float)y, (float)z);
                    }

                    s = txt.ReadLine();
                }
            }
        }
        /// <summary>
        /// 窗口退出.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
        private void btnQuit_Click(object sender, EventArgs e)
        {
            this.DialogResult = DialogResult.Cancel;
        }
        /// <summary>
        /// 选择输入文件.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
        private void btnFileInput_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Filter = "*.csv|*.csv|*.xyz|*.xyz|*.*|*.*||";
            ofd.RestoreDirectory = true;
            if(ofd.ShowDialog() == DialogResult.OK)
            {
                this.txtInput.Text = ofd.FileName;
            }
        }
        /// <summary>
        /// 选择输出文件.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
        private void btnFileOutput_Click(object sender, EventArgs e)
        {
            SaveFileDialog sfd = new SaveFileDialog();
            sfd.Filter = "*.dfd|*.dfd|*.pcg|*.pcg|*.*|*.*||";
            sfd.RestoreDirectory = true;
            sfd.OverwritePrompt = true;
            if(sfd.ShowDialog() == DialogResult.OK)
            {
                this.txtOutput.Text = sfd.FileName;
            }
        }
        public void CalculateRange(IReadOnlyList<Vector3> points, ref Vector3 pointMin, ref Vector3 pointMax)
        {
            if (points.Count == 0)
            {
                pointMin = pointMax = Vector3.Zero;
                return;
            }

            float minX = float.MaxValue;
            float minY = float.MaxValue;
            float minZ = float.MaxValue;

            float maxX = float.MinValue;
            float maxY = float.MinValue;
            float maxZ = float.MinValue;
            
            for (int i = 0; i < points.Count; ++i)
            {
                var pt = points[i];

                minX = Math.Min(minX, pt.X);
                maxX = Math.Max(maxX, pt.X);

                minY = Math.Min(minY, pt.Y);
                maxY = Math.Max(maxY, pt.Y);

                minZ = Math.Min(minZ, pt.Z);
                maxZ = Math.Max(maxZ, pt.Z);
            }
            pointMin.X = minX;
            pointMin.Y = minY;
            pointMin.Z = minZ;

            pointMax.X = maxX;
            pointMax.Y = maxY;
            pointMax.Z = maxZ;
        }

#if DEBUG
        const string DLL_FILE = "GridUtility.dll";
#else
        const string DLL_FILE = "GridUtility.dll";
#endif
        [DllImport(DLL_FILE, EntryPoint = "SetGridData", ExactSpelling = false, CallingConvention = CallingConvention.Cdecl)]
        public static extern void SetGridData(double xMin, double yMin, double[] pDataZ
            , double nCols, int nRows, double dx, double dy
            , double zMin, double zMax
            , double[] borderData, int borderDataSize);

        [DllImport(DLL_FILE, EntryPoint = "Destroy", ExactSpelling = false, CallingConvention = CallingConvention.Cdecl)]
        public static extern void DestoryXy();
    }
}