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;

namespace DataLoader.CS
{
    public class Importor
    {
        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(name, dirid, depid, verid, type, sizes, cs, scale, resolution, gather, batch, descr, create_user) values  @name, @dirid, @depid, @verid, @type, @sizes, @cs, @scale, @resolution, @gather, @batch, @descr, @create_user) returning id";

        private static readonly string insertMetaFile = "insert into lf.sys_meta_file(name, metaid, fileid, guid, path, sizes, create_user) values (@name, @metaid, @fileid, @guid, @path, @sizes, @create_user)";

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

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

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

        public static int InsertMeta(SysMeta meta)
        {
            // string sql = "INSERT INTO public.data_files(mid, guid, name, ext, path, subs, remark) VALUES (@mid, @guid, @name, @ext, @path, @subs, @remark) returning id";
            List<DbParameter> list = Tool.GetParams<SysMeta>(insertMeta, meta);

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

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

        public static int InsertMetaFile(SysMetaFile metaFile)
        {
            List<DbParameter> list = Tool.GetParams<SysMetaFile>(insertMetaFile, metaFile);

            object obj = Helper.ExecuteNonQuery(insertMetaFile, list.ToArray());

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

        public static void Import(ObservableCollection<ViewData> viewDatas, string source, string target)
        {
            string[] files = Directory.GetFiles(source);
            foreach (string file in files)
            {
                ViewData vd = new ViewData();
                viewDatas.Add(vd);


            }

            for (int i = 0, c = files.Length; i < c; i++)
            {
                ViewData vd = new ViewData();
                vd.ID = i + 1;
                vd.FilePath = 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 = 0;
            vd.Meta.depid = 0;
            vd.Meta.verid = 0;
            vd.Meta.type = "File";
            vd.Meta.sizes = Tool.SizeToMb(fi.Length);
            vd.Meta.cs = null;
            vd.Meta.scale = null;
            vd.Meta.resolution = null;
            vd.Meta.gather = DateTime.Now;
            vd.Meta.batch = null;
            vd.Meta.descr = null;
            vd.Meta.create_user = Tool.UserId;
        }
    }
}