using DataLoader.Model;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DataLoader.CS
{
    public class Importor
    {
        #region 加载
        /// <summary>
        /// 获取文件
        /// </summary>
        public static void GetFiles(ObservableCollection<ViewData> viewDatas, string path)
        {
            GetSubFiles(viewDatas, path);

            string[] directories = Directory.GetDirectories(path);
            if (null == directories || directories.Length == 0) return;

            foreach (string sub in directories)
            {
                if (IsGdbFile(sub))
                {
                    SetSysMeta(viewDatas, sub, "gdb");
                    continue;
                }
                if (IsOsgbFile(sub))
                {
                    SetSysMeta(viewDatas, sub, "osgb");
                    continue;
                }

                GetFiles(viewDatas, sub);
            }
        }

        /// <summary>
        /// 设置元数据
        /// </summary>
        private static void SetSysMeta(ObservableCollection<ViewData> viewDatas, string path, string ext)
        {
            ViewData vd = new ViewData();
            vd.ID = viewDatas.Count + 1;
            vd.FilePath = path;
            vd.Ext = "." + ext;
            vd.Status = "准备";
            viewDatas.Add(vd);

            SetSysMeta(vd);

            DirectoryInfo di = new DirectoryInfo(vd.FilePath);
            vd.Meta.name = di.Name;
            vd.Meta.type = ext;
        }

        /// <summary>
        /// 获取子文件
        /// </summary>
        private static void GetSubFiles(ObservableCollection<ViewData> viewDatas, string path)
        {
            string[] files = Directory.GetFiles(path);
            if (null == files || files.Length == 0) return;

            foreach (string file in files)
            {
                string ext = Path.GetExtension(file).ToLower();
                if (!StaticData.ALL_EXTENSION.Contains(ext) || IsExcludeFile(file)) continue;

                ViewData vd = new ViewData();
                vd.ID = viewDatas.Count + 1;
                vd.FilePath = file;
                vd.Ext = ext;
                vd.Status = "准备";
                viewDatas.Add(vd);

                SetSysMeta(vd);

                FileInfo fi = new FileInfo(vd.FilePath);
                vd.Meta.name = fi.Name;
                vd.Meta.type = fi.Extension.ToLower().Replace(".", "");
            }
        }

        /// <summary>
        /// 设置元数据
        /// </summary>
        private static void SetSysMeta(ViewData vd)
        {
            SysMeta meta = new SysMeta();
            meta.eventid = Guid.NewGuid().ToString();
            meta.metaid = 0;
            meta.verid = 0;
            meta.guid = null;
            meta.path = vd.FilePath; // *
            meta.sizes = GetFileSizes(vd);
            meta.tab = null;
            meta.rows = 0;
            meta.create_user = CommonProp.UserId;
            meta.create_time = DateTime.Now;
            meta.bak = null;
            meta.geom = null;
            meta.layer = null;
            meta.depcode = CommonProp.Depcode;
            meta.dircode = CommonProp.Dircode;
            meta.ismeta = 0;
            meta.sensortype = CommonProp.SensorType;
            meta.acq_time = CommonProp.AcqTime;

            vd.Meta = meta;
            vd.Sizes = meta.sizes;
        }

        /// <summary>
        /// 获取文件大小
        /// </summary>
        private static double GetFileSizes(ViewData vd)
        {
            if (File.Exists(vd.FilePath))
            {
                if (vd.Ext == StaticData.SHP)
                {
                    List<string> files = GetShpFiles(vd.FilePath);
                    return GetFileSizes(files.ToArray());
                }
                else
                {
                    FileInfo fi = new FileInfo(vd.FilePath);
                    return Tools.SizeToMb(fi.Length);
                }
            }

            if (Directory.Exists(vd.FilePath))
            {
                string[] files = Directory.GetFiles(vd.FilePath, "*", SearchOption.AllDirectories);
                return GetFileSizes(files);
            }

            return 0;
        }

        /// <summary>
        /// 获取文件大小
        /// </summary>
        private static double GetFileSizes(string[] files)
        {
            if (null == files || files.Length == 0) return 0;

            double sizes = 0;
            foreach (string file in files)
            {
                FileInfo fi = new FileInfo(file);
                sizes += Tools.SizeToMb(fi.Length);
            }

            return sizes;
        }

        /// <summary>
        /// 获取SHP文件集合
        /// </summary>
        private static List<string> GetShpFiles(string shpPath)
        {
            List<string> files = new List<string>();
            files.Add(shpPath);

            foreach (string ext in StaticData.SHP_EXT)
            {
                string file = shpPath.Replace(".shp", ext);
                if (File.Exists(file))
                {
                    files.Add(file);
                }
            }

            return files;
        }

        /// <summary>
        /// 是否为GDB文件
        /// </summary>
        private static bool IsGdbFile(string path)
        {
            if (!Directory.Exists(path)) return false;

            DirectoryInfo info = new DirectoryInfo(path);
            if (!info.Name.ToLower().EndsWith(StaticData.GDB)) return false;

            string gdb = Path.Combine(path, StaticData.NGDB);

            return File.Exists(gdb);
        }

        /// <summary>
        /// 是否为OSGB文件
        /// </summary>
        private static bool IsOsgbFile(string path)
        {
            if (!Directory.Exists(path)) return false;

            string meta = Path.Combine(path, "metadata.xml");
            string data = Path.Combine(path, "Data");

            return File.Exists(meta) && Directory.Exists(data);
        }

        /// <summary>
        /// 是/否为排除文件
        /// </summary>
        private static bool IsExcludeFile(string file)
        {
            bool isExclude = false;

            string name = Path.GetFileName(file).ToLower();
            foreach (string ext in StaticData.MAPPER_EXCLUDE_EXT)
            {
                if (name.EndsWith(ext))
                {
                    isExclude = true;
                    break;
                }
            }

            return isExclude;
        }
        #endregion

        #region 导入
        /// <summary>
        /// 导入文件
        /// </summary>
        public static void ImportFiles(ObservableCollection<ViewData> viewDatas)
        {
            Parallel.ForEach(viewDatas, (vd, ParallelLoopState) =>
            {
                try
                {
                    vd.Status = "生成MD5码...";
                    vd.Meta.guid = GetFilesMD5(vd);

                    if (!string.IsNullOrEmpty(vd.Meta.guid) && DBHelper.IsFileExists(vd.Meta.guid))
                    {
                        vd.Status = "已存在！";
                        return;
                    }

                    vd.Status = "读取栅格信息...";
                    ReadRasterInfo(vd);

                    vd.Status = "复制文件...";
                    CopyFiles(vd);

                    vd.Status = "元数据入库...";
                    int id = DBHelper.InsertMeta(vd.Meta);
                    vd.Status = id > 0 ? "成功。" : "失败！";
                }
                catch (Exception ex)
                {
                    LogOut.Error(ex.StackTrace);
                    vd.Status = string.Format("失败：{0}！", ex.Message);
                }
            });
        }

        /// <summary>
        /// 获取文件的MD5
        /// </summary>
        private static string GetFilesMD5(ViewData vd)
        {
            if ("1" != Tools.GetSetting("GetMD5")) return null;

            if (File.Exists(vd.FilePath))
            {
                if (vd.Ext == StaticData.SHP)
                {
                    List<string> files = GetShpFiles(vd.FilePath);
                    return GetFilesMD5(files.ToArray());
                }
                else
                {
                    return MD5Helper.GetMD5Hash(vd.FilePath);
                }
            }

            if (Directory.Exists(vd.FilePath))
            {
                string[] files = Directory.GetFiles(vd.FilePath, "*", SearchOption.AllDirectories);
                return GetFilesMD5(files);
            }

            return null;
        }

        /// <summary>
        /// 获取多个文件的MD5码
        /// </summary>
        private static string GetFilesMD5(string[] files)
        {
            if (null == files || files.Length == 0) return null;

            List<string> list = new List<string>();
            foreach (string file in files)
            {
                string md5 = MD5Helper.GetMD5Hash(file);
                if (string.IsNullOrEmpty(md5)) list.Add(md5);
            }

            if (list.Count == 0) return null;

            string str = string.Join(",", list.ToArray());
            byte[] bytes = Encoding.Unicode.GetBytes(str);

            return MD5Helper.GetMD5Hash(bytes);
        }

        /// <summary>
        /// 读取栅格信息
        /// </summary>
        private static void ReadRasterInfo(ViewData vd)
        {
            if (!StaticData.RASTER_EXT.Contains(vd.Ext) || !File.Exists(vd.FilePath)) return;

            GdalHelper.Instance.ReadRasterInfo(vd);
        }

        /// <summary>
        /// 复制文件
        /// </summary>
        private static void CopyFiles(ViewData vd)
        {
            if (string.IsNullOrEmpty(vd.Meta.guid)) vd.Meta.guid = vd.Meta.eventid;

            switch (vd.Ext)
            {
                case StaticData.MPT:
                    copyMultiFile(vd, StaticData.MPT_EXT);
                    break;
                case StaticData.JPG:
                    copyMultiFile(vd, StaticData.JPG_EXT);
                    break;
                case StaticData.IMG:
                    copyMultiFile(vd, StaticData.IMG_EXT);
                    break;
                case StaticData.TIF:
                    copyMultiFile(vd, StaticData.TIF_EXT);
                    break;
                case StaticData.TIFF:
                    copyMultiFile(vd, StaticData.TIFF_EXT);
                    break;
                case StaticData.SHP:
                    copyMultiFile(vd, StaticData.SHP_EXT);
                    break;
                case StaticData.OSGB:
                    copyFolderFile(vd);
                    break;
                case StaticData.GDB:
                    copyFolderFile(vd);
                    break;
                default:
                    copySingleFile(vd);
                    break;
            }
        }

        /// <summary>
        /// 复制文件夹
        /// </summary>
        private static int copyFolderFile(ViewData vd)
        {
            if (!Directory.Exists(vd.FilePath)) return -1;

            int count = 0;
            string[] files = Directory.GetFiles(vd.FilePath, "*", SearchOption.AllDirectories);
            foreach (string file in files)
            {
                try
                {
                    //
                    count++;
                }
                catch (Exception ex)
                {
                    LogOut.Error(ex.StackTrace);
                }
            }

            return count;
        }

        /// <summary>
        /// 复制多个文件
        /// </summary>
        private static int copyMultiFile(ViewData vd, List<string> exts)
        {
            int count = copySingleFile(vd);
            if (count < 0) return -1;

            string target = Path.Combine(CommonProp.TargetPath, vd.Meta.path);
            foreach (string ext in exts)
            {
                try
                {
                    File.Copy(vd.FilePath.Replace(vd.Ext, ext), target.Replace(vd.Ext, ext), true);
                    count++;
                }
                catch (Exception ex)
                {
                    LogOut.Error(ex.StackTrace);
                }
            }

            return count;
        }

        /// <summary>
        /// 复制单文件
        /// </summary>
        private static int copySingleFile(ViewData vd)
        {
            if (!File.Exists(vd.FilePath)) return -1;

            vd.Meta.path = Path.Combine("" + GetSubPath(), vd.Meta.guid + vd.Ext);
            string target = Path.Combine(CommonProp.TargetPath, vd.Meta.path);
            if (File.Exists(target)) return 0;

            try
            {
                File.Copy(vd.FilePath, target, true);

                return 1;
            }
            catch (Exception ex)
            {
                LogOut.Error(ex.StackTrace);
                return -1;
            }
        }

        /// <summary>
        /// 获取子目录
        /// </summary>
        private static int GetSubPath()
        {
            int start = 0;
            int.TryParse(Tools.GetSetting("StartPath"), out start);

            while (true)
            {
                string path = Path.Combine(CommonProp.TargetPath, start.ToString());
                if (!Directory.Exists(path))
                {
                    Directory.CreateDirectory(path);
                    return start;
                }

                string[] files = Directory.GetFiles(path);
                if (files.Length <= StaticData.MAX_FILES)
                {
                    return start;
                }

                start++;
            }
        }
        #endregion
    }
}