using System;
using Microsoft.Win32.SafeHandles;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace CameraVisionLib.Model
{
    internal static unsafe class BarcodeAPI
    {
        [DllImport(@".\EyemLib\eyemLib.dll", CharSet = CharSet.None, CallingConvention = CallingConvention.Cdecl)]
        internal static extern int eyemDetectAndDecode(EyemImage tpImage, EyemRect tpRoi, string fileName, string strCodeType, out DataCodeHandle hObject, out EyemBarCode* tpResults, out int ipNum, bool bUseNiBlack, int iBlockSize, int iRangeC, int iSymbolMin, int iSymbolMax, double dScaleUpAndDown = 0.5, double dToleErr = 0.5, double dMinorStep = 1.0);

        /// <summary>
        /// 读取图像
        /// </summary>
        /// <param name="filename"></param>
        /// <param name="iFalgs"></param>
        /// <param name="ucpImage"></param>
        /// <returns></returns>
        [DllImport(@".\EyemLib\eyemLib.dll", CharSet = CharSet.None, CallingConvention = CallingConvention.Cdecl)]
        internal static extern int eyemImageRead(string filename, int iFalgs, out EyemImage ucpImage);

        /// <summary>
        /// 释放图像资源
        /// </summary>
        /// <param name="ipImage"></param>
        [DllImport(@".\EyemLib\eyemLib.dll", CharSet = CharSet.None, CallingConvention = CallingConvention.Cdecl)]
        internal static extern void eyemImageFree(IntPtr ipImage);

        /// <summary>
        /// 释放工具
        /// </summary>
        /// <param name="hObject"></param>
        /// <returns></returns>
        [DllImport(@".\EyemLib\eyemLib.dll", CharSet = CharSet.None, CallingConvention = CallingConvention.Cdecl)]
        internal static extern bool eyemDetectAndDecodeFree(IntPtr hObject);

        internal class DataCodeHandle : SafeHandleZeroOrMinusOneIsInvalid
        {
            public DataCodeHandle() : base(true) { }
            protected override bool ReleaseHandle()
            {
                return eyemDetectAndDecodeFree(handle);
            }
        }

        [StructLayout(LayoutKind.Sequential)]
        internal struct EyemImage
        {
            /// <summary>
            /// 地址
            /// </summary>
            public IntPtr ucpImage;
            /// <summary>
            /// 图像内存 x 方向大小
            /// </summary>
            public int iWidth;
            /// <summary>
            /// 图像内存 y 方向大小
            /// </summary>
            public int iHeight;
            /// <summary>
            /// 图像通道数
            /// </summary>
            public int iChannel;
        }

        [StructLayout(LayoutKind.Sequential)]
        internal struct EyemRect
        {
            /// <summary>
            /// 起始点（左上角） x 坐标
            /// </summary>
            public int iXs;
            /// <summary>
            /// 起始点（左上角） y 坐标
            /// </summary>
            public int iYs;
            /// <summary>
            /// x 方向大小（宽度）
            /// </summary>
            public int iWidth;
            /// <summary>
            /// y 方向大小（高度）
            /// </summary>
            public int iHeight;
        }

        [StructLayout(LayoutKind.Sequential)]
        internal struct EyemBarCode
        {
            /// <summary>
            /// 角度
            /// </summary>
            public double dAngle;
            /// <summary>
            /// x坐标
            /// </summary>
            public int iCenterX;
            /// <summary>
            /// y坐标
            /// </summary>
            public int iCenterY;
            /// <summary>
            /// 码类型
            /// </summary>
            public IntPtr hType;
            /// <summary>
            /// 码内容
            /// </summary>
            public IntPtr hText;
        }
    }
}