using DaJiaoYan.Models;
using DaJiaoYan.Utils;
using DaJiaoYan.Variables;
using OpenCvSharp;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Threading.Tasks;
using static DaJiaoYan.Models.PartitionConfig;

namespace DaJiaoYan.Services
{

    struct ScanResult
    {
        public string Filename;
        public int Index;
    }

    internal class PingHandler : HttpHandler
    {
        private ResponseData pongResponse = new ResponseData { Code = 200, Data = "pong" };

        public PingHandler(AsyncHttpServer httpServer) : base(httpServer)
        {
        }

        public override void Get(HttpListenerRequest request, HttpListenerResponse response)
        {
            Json(ref response, ref pongResponse);
        }
    }


    internal class ScannerHandler : HttpHandler
    {
        public ScannerHandler(AsyncHttpServer httpServer) : base(httpServer)
        {
        }

        public override void Get(HttpListenerRequest request, HttpListenerResponse response)
        {
            ResponseData result = new ResponseData { Code = 200, Data = Variables.Vars.Scanners };
            Json(ref response, ref result);
        }
    }


    public class ScanHandler : HttpHandler
    {
        public ScanHandler(AsyncHttpServer httpServer) : base(httpServer)
        {
        }

        public override async void Post(HttpListenerRequest request, HttpListenerResponse response)
        {
            ResponseData result = new ResponseData { Code = 200 };
            var form = this.HttpServer.ParseForm(ref request);
            form.TryGetValue("scanner", out string scanner);
            var files = new List<string>();
            var finished = false;
            result.Data = files;
            if (string.IsNullOrEmpty(scanner))
            {
                result.Code = 400;
                result.Errors = "请选择扫描仪";
                finished = true;
            }
            else if (!Vars.Scanners.Contains(scanner))
            {
                result.Code = 400;
                result.Errors = "请选择正确的扫描仪";
                finished = true;
            }
            else if (Scan.State == Scan.ScannerState.Running)
            {
                result.Code = 400;
                result.Errors = "正在扫描中";
                finished = true;
            }
            else
            {
                ScanTask scanTask = new ScanTask
                {
                    Scanner = scanner,
                    ImageDpi = 200,
                    ImageSuffix = "png",
                    Colorful = true,
                    Path = Const.TMP_PATH,
                    CapXferCount = 2,
                    OnScanBegin = (bool begin, string err) =>
                    {
                        if (!begin)
                        {
                            result.Code = 400;
                            result.Errors = err;
                            finished = true;
                        }
                    },
                    OnDeleScanFileCompleted = (string f, int index) =>
                    {
                        try
                        {
                            Mat img = Cv2.ImRead(f);

                            if (img != null && img.Channels() > 1)
                            {
                                ImageUtils.Red2OtherColor(ref img, Scalar.Black);
                                Mat dstImg = new Mat(img.Size(), MatType.CV_8UC1);
                                Cv2.CvtColor(img, dstImg, ColorConversionCodes.BGR2GRAY);
                                Cv2.ImWrite(f, dstImg);
                                dstImg.Dispose();
                            }
                            files.Add(ImageUtils.ToBase64(f));
                            img?.Dispose();
                        }
                        catch
                        {
                        }
                    },
                    OnScanTaskCompleted = () =>
                    {
                        result.Code = 200;
                        finished = true;
                    },
                    OnScannerError = () =>
                    {
                        result.Code = 200;
                        result.Errors = "扫描出错！";
                        finished = true;
                    }
                };
                Scan.Start(scanTask);
                while (!finished || files.Count < 2)
                {
                    await Task.Delay(100);
                }
            }
            Json(ref response, ref result);
        }
    }


    public class UploadHandler : HttpHandler
    {
        public UploadHandler(AsyncHttpServer httpServer) : base(httpServer)
        {
        }

        /// <summary>
        /// 扫描图片上传接口
        /// </summary>
        /// <param name="request"></param>
        /// <param name="response"></param>
        public override async void Post(HttpListenerRequest request, HttpListenerResponse response)
        {
            ResponseData result = new ResponseData { Code = 200 };
            int ocrVer = 0;
            var form = this.HttpServer.ParseForm(ref request);
            form.TryGetValue("token", out string token);
            form.TryGetValue("type", out string type);
            form.TryGetValue("school_id", out string school_id);
            form.TryGetValue("campus_id", out string campus_id);
            form.TryGetValue("class_id", out string class_id);
            form.TryGetValue("test_id", out string test_id);
            form.TryGetValue("subject_id", out string subject_id);
            form.TryGetValue("is_school_no", out string is_school_no);
            form.TryGetValue("sign_weight", out string sign_weight);
            form.TryGetValue("marking_type", out string marking_type);
            form.TryGetValue("scanner", out string scanner);
            form.TryGetValue("directory", out string directory);
            form.TryGetValue("ver", out string ver);
            if (!string.IsNullOrEmpty(ver))
            {
                int.TryParse(ver, out ocrVer);
            }

            UploadHandlerPostParam param = new UploadHandlerPostParam(
                token, type, school_id, campus_id, class_id, test_id, subject_id, is_school_no, sign_weight, scanner, directory, marking_type,
                ocrVer
                );

            if (param.GetErrorType != UploadHandlerPostParam.ErrorType.None)
            {
                result.Code = 400;
                result.Errors = param.ErrorMessage;
            }
            else
            {

                var divideConfig = await Api.GetDividePartitionConfig(param.TestId, param.Token);
                if (param.Type == UploadHandlerPostParam.UploadType.Scan)
                {
                    if (Scan.State == Scan.ScannerState.Running)
                    {
                        result.Code = 400;
                        result.Errors = "正在扫描中，请稍候";
                    }
                    if (string.IsNullOrEmpty(scanner))
                    {
                        result.Code = 400;
                        result.Errors = "请选择扫描仪";
                        param.ScanFinish = true;
                    }
                    else if (!Vars.Scanners.Contains(scanner))
                    {
                        result.Code = 400;
                        result.Errors = "请选择正确的扫描仪";
                        param.ScanFinish = true;
                    }
                    else
                    {
                        AliyunOssClient ossClient = new AliyunOssClient(param.Token);
                        if (!ossClient.AccessAvailable)
                        {
                            result.Code = 400;
                            result.Errors = "没有上传权限，请检查";
                        }
                        else
                        {

                            string batchId = Functions.GenUUID();
                            string uploadTaskInfoId = batchId;
                            result.Data = batchId;
                            UploadTask.deleNewUploadTask(uploadTaskInfoId);
                            string path = Path.Combine(Const.TMP_PATH, campus_id.ToString(), test_id.ToString(), batchId);
                            FileExts.CheckDirectory(path, true);
                            param.Directory = path;
                            object _locker = new object();
                            ScanResultPost scanResult = new ScanResultPost(param);
                            //List<string> files = new List<string>();
                            List<ScanResult> scanFiles = new List<ScanResult>();
                            int n = 0, finished = 0;
                            const int BATCH_SIZE = 2; //扫描1张就上传

                            bool uploadImage(string ossFn, string fn)
                            {
                                bool res = false;
                                if (scanResult.MarkingType == UploadHandlerPostParam.MarkType.OnlineMarking)
                                {
                                    try
                                    {
                                        Mat img = Cv2.ImRead(fn);

                                        if (img != null && img.Channels() > 1)
                                        {
                                            Mat dstImg = new Mat(img.Size(), MatType.CV_8UC1);
                                            Cv2.CvtColor(img, dstImg, ColorConversionCodes.BGR2GRAY);
                                            Cv2.ImWrite(fn, dstImg);
                                            img.Dispose();
                                            dstImg.Dispose();
                                        }
                                        img?.Dispose();
                                    }
                                    catch
                                    {

                                    }
                                }
                                res = ossClient.SimpleUpload(ossFn, fn);
                                UploadTask.deleIncreaseUploadTask(uploadTaskInfoId);
                                return res;
                            }
                            async void uploadedFilenames()
                            {
                                //Console.WriteLine($"n={n}, total={scanResult.Total}, finish={scanResult.Finish}");
                                if (n >= BATCH_SIZE || scanResult.Finish)
                                {
                                    List<Task> tasks = new List<Task>();
                                    ScanResultPost sr = new ScanResultPost(param);
                                    lock (_locker)
                                    {
                                        sr.Finish = scanResult.Finish;
                                        sr.Total = scanResult.Total;
                                        sr.BatchId = scanResult.BatchId;
                                    }
                                    for (int i = sr.Total - n; i < sr.Total; i++)
                                    {
                                        int idx = i;
                                        ScanResultPost.ImageInfo info = new ScanResultPost.ImageInfo()
                                        {
                                            Image = scanFiles[idx].Filename,
                                            HasError = 1,
                                            Index = scanFiles[idx].Index
                                        };
                                        sr.Images.Add(info);
                                        tasks.Add(Task.Run(() =>
                                        {
                                            if (uploadImage(scanFiles[idx].Filename, Path.Combine(path, Path.GetFileName(scanFiles[idx].Filename))))
                                            {
                                                info.HasError = 0;
                                            }
                                        }));
                                    }
                                    n = 0;
                                    await Task.Factory.StartNew(async () =>
                                    {
                                        await Task.WhenAll(tasks.ToArray());
                                        // 上传图片地址
                                        await Api.PostExaminationScanResult(sr, param.Token);
                                        Vars.UploadedCounterIncrease(tasks.Count);
                                        lock (_locker)
                                        {
                                            finished += BATCH_SIZE;
                                        }
                                        //UploadTask.deleIncreaseUploadTask(uploadTaskInfoId, BATCH_SIZE);
                                    });
                                }
                            }

                            ScanTask scanTask = new ScanTask
                            {
                                Scanner = scanner,
                                ImageDpi = 200,
                                ImageSuffix = "jpg",
                                Colorful = param.MarkingType == UploadHandlerPostParam.MarkType.LocalMarking || (divideConfig != null && !divideConfig.Template.MarkingOnLine),
                                Path = path,
                                CapXferCount = -1,
                                OnScanBegin = (bool begin, string err) =>
                                {
                                    if (!begin)
                                    {
                                        result.Code = 400;
                                        result.Errors = err;
                                        scanResult.Finish = true;
                                    }
                                },
                                OnDeleScanFileCompleted = (string f, int index) =>
                                {
                                    try
                                    {
                                        Task.Factory.StartNew(() =>
                                        {
                                            string originFilename = Functions.GenUploadOriginImageName(param.TestId, param.CampusId, f, scanResult.BatchId);
                                            lock (_locker)
                                            {
                                                //files.Add(originFilename);
                                                scanFiles.Add(new ScanResult { Filename = originFilename, Index = index });
                                                n++;
                                                scanResult.Total++;
                                            }
                                            UploadTask.deleIncreaseScanTask(uploadTaskInfoId, 1);
                                            uploadedFilenames();
                                        });

                                    }
                                    catch
                                    {
                                    }
                                },
                                OnScanTaskCompleted = async () =>
                                {
                                    result.Code = 200;
                                    if (scanFiles.Count > 0)
                                    {
                                        while (finished < scanResult.Total)
                                        {
                                            await Task.Delay(1000);
                                        }
                                    }
                                    scanResult.Finish = true;
                                    UploadTask.deleFinishScanTask(uploadTaskInfoId);
                                },
                                OnScannerError = () =>
                                {
                                    result.Code = 200;
                                    result.Errors = "扫描出错！";
                                    scanResult.Finish = true;
                                }
                            };
                            await Task.Factory.StartNew(async () =>
                            {
                                Scan.Start(scanTask);
                                Vars.SetTaskStatus(batchId, false);
                                while (!scanResult.Finish)
                                {
                                    await Task.Delay(100);
                                }
                                uploadedFilenames();
                                Vars.SetTaskStatus(batchId, true);
                                UploadTask.deleFinishUploadTask(uploadTaskInfoId);
                            });

                        }
                    }
                }
                else
                {
                    int answerSheetsLength = 2;
                    if (divideConfig != null)
                    {
                        answerSheetsLength = divideConfig.AnswerSheets.Length;
                    }

                    // 上传文件夹
                    List<string> files = FileExts.GetImageFiles(param.Directory);
                    if (divideConfig != null && files.Count > 0 && answerSheetsLength > 0 && files.Count % answerSheetsLength != 0)
                    {
                        result.Code = 400;
                        result.Errors = "本地答卷数量与模板数量不一致，请核查";
                    }
                    else if (files.Count > 0)
                    {
                        AliyunOssClient ossClient = new AliyunOssClient(param.Token);
                        if (!ossClient.AccessAvailable)
                        {
                            result.Code = 400;
                            result.Errors = "没有上传权限，请检查";
                        }
                        else
                        {
                            const int BATCH_SIZE = 4; //作为一个批次上传的图片数量
                            string uploadTaskInfoId = Functions.GenUUID();
                            UploadTask.deleNewUploadTask(uploadTaskInfoId);
                            UploadTask.deleIncreaseScanTask(uploadTaskInfoId, files.Count);
                            UploadTask.deleFinishScanTask(uploadTaskInfoId);
                            result.Data = uploadTaskInfoId;
                            int n = 0, idx = 0;
                            ScanResultPost scanResult = new ScanResultPost(param)
                            {
                                Total = files.Count
                            };
                            bool uploadImage(string ossFn, string fn)
                            {
                                bool res = false;
                                MemoryStream ms = new MemoryStream();
                                string suffix = Path.GetExtension(fn).ToLower();
                                ImageEncodingParam imageEncodingParam = Vars.IMAGE_SAVE_PNG_PARAM;
                                Mat img;
                                if (suffix.Equals(".jpeg", StringComparison.OrdinalIgnoreCase) || suffix.Equals(".jpg", StringComparison.OrdinalIgnoreCase))
                                {
                                    imageEncodingParam = Vars.IMAGE_SAVE_JPEG_PARAM;
                                }

                                if (scanResult.MarkingType == UploadHandlerPostParam.MarkType.LocalMarking || (divideConfig != null && !divideConfig.Template.MarkingOnLine))
                                {
                                    img = ImageUtils.Read(fn);
                                }
                                else
                                {
                                    img = ImageUtils.Read(fn, ImreadModes.Grayscale);
                                }
                                if (img != null)
                                {
                                    ms = img.ToMemoryStream(suffix, imageEncodingParam);
                                    res = ossClient.SimpleUpload(ossFn, ms);
                                    img?.Dispose();
                                    ms?.Dispose();
                                }

                                return res;
                            }
                            async Task uploadedFilenames()
                            {
                                //Console.WriteLine($"n={n}, total={scanResult.Total}, finish={scanResult.Finish}");
                                List<Task> tasks = new List<Task>();
                                if (n >= BATCH_SIZE || scanResult.Finish)
                                {
                                    scanResult.Images.Clear();
                                    for (int i = 0; idx < scanResult.Total && i < n; i++)
                                    {
                                        int _k = idx;
                                        string originImageFilename = Functions.GenUploadOriginImageName(scanResult.TestId, scanResult.CampusId, files[_k], scanResult.BatchId);
                                        ScanResultPost.ImageInfo info = new ScanResultPost.ImageInfo() { Image = originImageFilename, HasError = 1 };
                                        scanResult.Images.Add(info);
                                        tasks.Add(Task.Run(() =>
                                        {
                                            if (uploadImage(originImageFilename, files[_k]))
                                            {
                                                Console.WriteLine($"{originImageFilename} uploaded.");
                                                info.HasError = 0;
                                                info.Index = _k + 1;
                                                UploadTask.deleIncreaseUploadTask(uploadTaskInfoId);
                                            }
                                        }));
                                        idx++;
                                    }
                                    n = 0;
                                }
                                Task.WaitAll(tasks.ToArray());
                                // 上传图片地址
                                await Api.PostExaminationScanResult(scanResult, param.Token);
                                Vars.UploadedCounterIncrease(tasks.Count);
                            }
                            _ = Task.Factory.StartNew(async () =>
                            {
                                string batchId = scanResult.BatchId;
                                Vars.SetTaskStatus(batchId, false);
                                for (int i = 0; i < files.Count; i += BATCH_SIZE)
                                {
                                    n = BATCH_SIZE;
                                    await uploadedFilenames();

                                    await Task.Delay(100);
                                }
                                scanResult.Finish = true;
                                n = BATCH_SIZE;
                                await uploadedFilenames();
                                Vars.SetTaskStatus(batchId, true);
                                UploadTask.deleFinishUploadTask(uploadTaskInfoId);
                            });
                        }
                    }
                    else
                    {
                        result.Code = 400;
                        result.Errors = "没有可上传的图片";
                    }
                }
            }

            Json(ref response, ref result);
        }


        public override void Get(HttpListenerRequest request, HttpListenerResponse response)
        {
            ResponseData result = new ResponseData { Code = 200 };
            string id = request.QueryString.Get("id");

            result.Data = UploadTask.deleGetUploadTask(id);
            Json(ref response, ref result);
        }
    }


}