using CloudBuilder.Core.Authorization;
using CloudBuilder.Core.DatabaseAccessor.Entity;
using CloudBuilder.Core.DependencyInjection.Task;
using CloudBuilder.Core.Policy;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Text;


namespace CloudBuilder.Topshelf.Task
{
    /// <summary>
    /// 分隔文件并保存為UTF-8格式,
    /// 【encoding】原文件格式必填,
    /// 【split_size】分隔大小单位为M 【split_number】分隔文件數量,這兩個參數必填其中之一,
    /// 【input】文件夹或者文件路径必填,
    /// 【output】输出文件夹路径
    /// task:SplitFileSaveUTF8Task encoding:GB2312 split_size:1 input:D:\NET8\AIML文档\汉语大词典1994+订补+资料Txt output:D:\NET8\AIML文档\汉语大词典1994UTF8
    /// task:SplitFileSaveUTF8Task encoding:GB2312 split_number:1 input:D:\NET8\AIML文档\汉语大词典1994+订补+资料Txt output:D:\NET8\AIML文档\汉语大词典1994UTF8
    /// </summary>
    public class SplitFileSaveUTF8Task : IScheduleTask
    {
        private readonly IApplicationService service;

        public SplitFileSaveUTF8Task(IApplicationService service)
        {
            this.service = service;
        }

        public void Run(Dictionary<string, string> bodyDict)
        {
            if (!bodyDict.ContainsKey("input")) return;
            if (!bodyDict.ContainsKey("encoding")) return;
            if (!bodyDict.ContainsKey("output")) return;

            int splitNumber = 0;
            if (bodyDict.ContainsKey("split_number"))
                splitNumber = Convert.ToInt32(bodyDict["split_number"]);

            string encoding = bodyDict["encoding"];
            string output = bodyDict["output"];
            string input = bodyDict["input"];

            decimal splitSize = 0;
            if (bodyDict.ContainsKey("split_size"))
                splitSize = Convert.ToDecimal(bodyDict["split_size"]);

            List<string> files = PackFiles(input);

            foreach (string file in files)
            {
                SaveFile(encoding, file, output, splitNumber, splitSize);
            }
        }

        private void SaveFile(string encoding, string fileName, string output, int splitNumber, decimal splitSize)
        {
            System.Text.Encoding.RegisterProvider(System.Text.CodePagesEncodingProvider.Instance);

            string context = File.ReadAllText(fileName, Encoding.GetEncoding(encoding));

            int maxlength = context.Length;

            int maxSplit = maxlength;

            //如果傳入的是分隔數，以分隔數為準
            if (splitNumber > 0)
            {
                maxSplit = (int)Math.Ceiling(maxlength * 1.0m / splitNumber);
            }

            if (splitSize > 0 && splitNumber == 0)
            {
                FileInfo fileInfo = new FileInfo(fileName);

                splitNumber = (int)Math.Ceiling(fileInfo.Length / ((1024m * 1024m) * splitSize));

                maxSplit = (int)Math.Ceiling(maxlength * 1.0m / splitNumber);
            }


            int reqLenth = maxSplit;

            string ct = string.Empty;

            for (int i = 0; i < splitNumber; i++)
            {
                if (i > 0 && splitNumber == i + 1) { reqLenth = maxlength % maxSplit; }

                if (splitNumber > 1)
                {
                    ct = context.Substring(i * maxSplit, reqLenth);
                }
                else
                {
                    ct = context;
                }

                string outputPath = Path.Combine(output,
                    Path.GetFileNameWithoutExtension(fileName) + string.Format("_{0}", i+1) +
                    Path.GetExtension(fileName));

                File.WriteAllText(outputPath,
                     ct, Encoding.UTF8);
            }
        }

        private List<string> PackFiles(string input)
        {
            List<string> files = new List<string>();
            if (Path.HasExtension(input) && !string.IsNullOrEmpty(input))
            {
                if (File.Exists(input))
                {
                    files.Add(input);
                }
            }
            else if (!string.IsNullOrEmpty(input))
            {
                if (Directory.Exists(input))
                {
                    string[] tempFiles = Directory.GetFiles(input);
                    if (tempFiles != null && tempFiles.Length > 0)
                    {
                        files.AddRange(tempFiles);
                    }
                }
            }

            return files;
        }

    }
}