using DataLoader.Model;
using Npgsql;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Data.Common;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DataLoader.CS
{
    public class Importor
    {
        private static List<String> Exclusions = new List<string>() { 
            "jp2.aux.xml", 
            ".midx", ".strmi", 
            ".rrd", ".img.aux.xml", ".hdr", ".img.enp", ".img.xml", 
            ".tfw", ".tif.ovr", ".tif.aux.xml", ".tif.enp", ".tif.xml", ".prj",
            ".shx", ".dbf", ".cpg" //, ".prj"
        };

        private static PostgreHelper _ph = null;

        public static PostgreHelper Helper
        {
            get
            {
                if (_ph == null) _ph = new PostgreHelper(DbEnum.langfang);

                return _ph;
            }
        }

        private static readonly string insertMeta = "insert into lf.sys_meta (eventid, metaid, dirid, depid, verid, name, type, guid, path, sizes, tab, rows, create_user, create_time) values (@eventid, @metaid, @dirid, @depid, @verid, @name, @type, @guid, @path, @sizes, @tab, @rows, @create_user, now()) returning id";

        public static string GetFilePathByGuid(string guid)
        {
            string sql = "select path from lf.sys_meta where guid = @guid limit 1";

            DbParameter dp = new NpgsqlParameter("@guid", guid);
            object obj = Helper.GetScalar(sql, dp);

            return obj == null ? null : obj.ToString();
        }

        public static bool IsFileExists(string guid)
        {
            string sql = "select count(*) from lf.sys_meta where guid = @guid";

            DbParameter dp = new NpgsqlParameter("@guid", guid);
            object obj = Helper.GetScalar(sql, dp);

            return obj != null && Convert.ToInt32(obj) > 0;
        }

        public static int InsertMeta(SysMeta meta)
        {
            List<DbParameter> list = Tool.GetParams<SysMeta>(insertMeta, meta);

            object obj = Helper.GetScalar(insertMeta, list.ToArray());

            return obj == null ? 0 : Convert.ToInt32(obj);
        }

        public static void GetFiles(ObservableCollection<ViewData> viewDatas, string source)
        {
            string[] files = Directory.GetFiles(source);
            for (int i = 0, c = files.Length; i < c; i++)
            {
                ViewData vd = new ViewData();
                vd.ID = i + 1;
                vd.FilePath = files[i];
                vd.Ext = System.IO.Path.GetExtension(files[i]);
                vd.Status = "准备";
                viewDatas.Add(vd);

                SetSysMeta(vd);
            }
        }

        private static void SetSysMeta(ViewData vd)
        {
            FileInfo fi = new FileInfo(vd.FilePath);

            vd.Meta = new SysMeta();
            vd.Meta.name = fi.Name;
            vd.Meta.dirid = Tool.DirId;
            vd.Meta.depid = 1;
            vd.Meta.verid = 0;
            vd.Meta.type = fi.Extension.ToLower().Replace(".", "");
            vd.Meta.sizes = Tool.SizeToMb(fi.Length);
            vd.Meta.create_user = Tool.UserId;
        }

        public static void ImportFiles(ObservableCollection<ViewData> viewDatas, string target)
        {
            Parallel.ForEach(viewDatas, (vd, ParallelLoopState) =>
            {
                try
                {
                    vd.Status = "生成MD5码...";
                    string guid = MD5Helper.GetMD5Hash(vd.FilePath);
                    if (!Exclusions.Contains(vd.Ext) && IsFileExists(guid))
                    {
                        vd.Status = "已存在！";
                        return;
                    }

                    vd.Status = "插入数据库...";
                    int start = GetSubPath(target, 1);
                    SysMeta mf = GetMetaFile(vd, start, guid);

                    int metaId = InsertMeta(mf);
                    if (metaId == 0)
                    {
                        vd.Status = "元数据出错！";
                        return;
                    }

                    vd.Status = "复制文件...";
                    CopyFile(vd.FilePath, Path.Combine(target, mf.path));

                    vd.Status = "完成。";
                }
                catch (Exception ex)
                {
                    LogOut.Error(ex.Message + "\r\n" + ex.StackTrace);
                    vd.Status = "失败！";
                }
            });
        }

        public static void ImportFiles2(ObservableCollection<ViewData> viewDatas, string target)
        {
            int start = 1;
            foreach (ViewData vd in viewDatas)
            {
                try
                {
                    vd.Status = "生成MD5码...";
                    string guid = MD5Helper.GetMD5Hash(vd.FilePath);
                    if (IsFileExists(guid))
                    {
                        vd.Status = "已存在！";
                        continue;
                    }

                    vd.Status = "插入数据库...";
                    start = GetSubPath(target, start);
                    SysMeta mf = GetMetaFile(vd, start, guid);

                    int metaId = InsertMeta(mf);
                    if (metaId == 0)
                    {
                        vd.Status = "元数据出错！";
                        continue;
                    }

                    vd.Status = "复制文件...";
                    CopyFile(vd.FilePath, Path.Combine(target, mf.path));

                    vd.Status = "完成。";
                }
                catch (Exception ex)
                {
                    LogOut.Error(ex.Message + "\r\n" + ex.StackTrace);
                    vd.Status = "失败！";
                }
            }
        }

        private static int GetSubPath(string target, int start = 1)
        {
            while (true)
            {
                string path = Path.Combine(target, start.ToString());
                if (!Directory.Exists(path))
                {
                    Directory.CreateDirectory(path);
                    return start;
                }

                string[] files = Directory.GetFiles(path);
                if (files.Length < 2001)
                {
                    return start;
                }

                start++;
            }
        }

        private static SysMeta GetMetaFile(ViewData vd, int subPath, string guid)
        {
            SysMeta mf = new SysMeta();
            mf.eventid = Guid.NewGuid().ToString();
            mf.metaid = 0;
            mf.dirid = vd.Meta.dirid;
            mf.depid = vd.Meta.depid;
            mf.verid = vd.Meta.verid;
            mf.name = vd.Meta.name;
            mf.type = vd.Meta.type;
            mf.guid = guid;
            mf.path = subPath + "\\" + mf.name;
            mf.sizes = vd.Meta.sizes;
            mf.tab = null;
            mf.rows = 0;
            mf.create_user = vd.Meta.create_user;

            return mf;
        }

        private static void CopyFile(string source, string target)
        {
            if (File.Exists(source))
            {
                File.Copy(source, target, true);
            }
        }
    }
}