using System;
using System.Collections.Generic;
using System.IO;
using AI.Reconstruction;
using AI.Common;


namespace Tools
{
    public class FileCreator
    {
        /// <summary>
        /// 注意：颈动脉三维重建的代码中extendedData是由左右颈的Enum值、VinnoImageData里读到的Probe和Visual组成的VinnoCarotid3DPhysicalData
        /// 考虑到要兼容甲状腺三维重建（以及其他部位），这里未给extendedData赋值（extendedData应该由界面上希望呈现哪些额外的内容来决定要写入什么信息），
        /// 因此在写入surface文件里时，extendedData的长度为0
        /// 另，physicalLength 的单位由调用者决定，重建时不关心单位是mm还是cm还是m，（如果在界面上呈现病灶尺寸时需要单位，可以作为extendedData写入）
        /// </summary>
        /// <param name="vidFilePath"></param>
        /// <param name="scanType"></param>
        /// <param name="physicalLength"></param>
        /// <param name="extenedData"></param>
        /// <returns></returns>
        public static RawVolumeData VidToRawVolumeData(string vidFilePath, EnumVolumeDataScanType scanType, int physicalLength)
        {
            var vinnoImgData = new VinnoImageData(vidFilePath, OperationMode.Open);

            int imgWidth = 0;
            int imgDepth = 0;
            float physicalWidth = 0;
            float physicalDepth = 0;
            RectF logicalRegion = RectF.Empty;
            List<byte[]> dataBuffers = new List<byte[]>();
            for (int ni = 0; ni < vinnoImgData.ImageCount; ni++)
            {
                var vinnoImg = vinnoImgData.GetImage(ni);
                var imgBuffer = vinnoImg.ImageData;
                dataBuffers.Add(imgBuffer);
                if (ni == 0)
                {
                    imgWidth = vinnoImg.Width;
                    imgDepth = vinnoImg.Height;
                    if (vinnoImg.Visuals.Count != 0)
                    {
                        if (vinnoImg.Visuals[0] is Vinno2DVisual visual)
                        {
                            if (visual.PhysicalCoordinates.ContainsKey(VinnoVisualAreaType.Tissue))
                            {
                                var physicalCoordinate = visual.PhysicalCoordinates[VinnoVisualAreaType.Tissue];
                                if (physicalCoordinate is VinnoTissuePhysicalCoordinate pCoordinate)
                                {
                                    physicalDepth = (float)(pCoordinate.DepthEnd - pCoordinate.DepthStart);
                                    physicalWidth = (float)pCoordinate.Width;
                                }
                                var logicalCoordinate = visual.LogicalCoordinates[VinnoVisualAreaType.Tissue];
                                var region = logicalCoordinate.Region;
                                logicalRegion = new RectF((float)region.Left, (float)region.Top, (float)region.Width,
                                    (float)region.Height);
                            }
                        }
                    }
                }
            }
            // 从vinnoImgData.ExtendedData中好像可以解析出 scanDistance、carotidType、carotidDirection
            // scanDistance 即扫查距离，等同于这里的physicalLength
            // carotidType 可以区分左右颈
            // carotidDirection 是扫查方向，从上到下，还是从下到上
            var extendedData = vinnoImgData.ExtendedData;
            if (extendedData.Length != 0)
            {
                using (var stream = new MemoryStream(extendedData))
                {
                    stream.Position = 0;
                    var reader = new AI.Common.Tools.AIStreamReader(stream);
                    var count = reader.ReadInt();
                    if (count > 0 && count <= extendedData.Length)
                    {
                        // ToDo 补充完整（用读出的值替换现在的physicalLength和scanType么？）
                    }
                }
            }
            var volumeData = new RawVolumeData();
            volumeData.ReadFromVinnoImageDatas(dataBuffers, imgWidth, imgDepth, logicalRegion,
                physicalWidth, physicalDepth, physicalLength, scanType,extendedData);
            return volumeData;
        }

    }
}