using DataLoader.Model;
using Npgsql;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Linq;

namespace DataLoader.CS
{
    /// <summary>
    /// 数据库帮助类
    /// </summary>
    public class DBHelper
    {
        // id, eventid, metaid, verid, name, type, guid, path, sizes, tab, rows, create_user, create_time, update_user, update_time, bak, geom, layer, depcode, dircode, ismeta, sensortype, acq_time, resolution, gridsize, coor_sys, epsg, h_datum, mata_type, bands, band_type, ct
        public static string insertMeta = "insert into lf.sys_meta (eventid, metaid, verid, name, type, guid, path, sizes, tab, rows, create_user, create_time, bak, geom, layer, depcode, dircode, ismeta, sensortype, acq_time, resolution, gridsize, coor_sys, epsg, h_datum, mata_type, bands, band_type, ct) values (@eventid, @metaid, @verid, @name, @type, @guid, @path, @sizes, @tab, @rows, @create_user, now(), @bak, @geom, @layer, @depcode, @dircode, @ismeta, @sensortype, @acq_time, @resolution, @gridsize, @coor_sys, @epsg, @h_datum, @mata_type, @bands, @band_type, @ct) returning id";

        /// <summary>
        /// 插入元数据
        /// </summary>
        public int InsertMeta(List<SysMeta> list)
        {
            PostgreHelper db = Tools.DBHelper;

            int count = 0;
            foreach (SysMeta meta in list)
            {
                List<DbParameter> args = Tools.GetParams<SysMeta>(insertMeta, meta)
                    ;
                int id = db.GetIntScalar(insertMeta, args.ToArray());
                if (id > 0) count++;
            }

            return count;
        }

        /// <summary>
        /// 根据GUID查询路径
        /// </summary>
        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 = Tools.DBHelper.GetScalar(sql, dp);

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

        /// <summary>
        /// 文件是/否存在
        /// </summary>
        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 = Tools.DBHelper.GetScalar(sql, dp);

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

        /// <summary>
        /// 获取目录列表
        /// </summary>
        public static List<SysDir> GetDirList()
        {
            string sql = "select a.*, fn_get_fullname(a.code, 2) fullName from lf.sys_dir a";
            DataTable dt = Tools.DBHelper.GetDataTable(sql);
            if (null == dt || dt.Rows.Count == 0) return null;

            List<SysDir> list = ModelHandler.FillModel<SysDir>(dt);

            return list;
        }
    }
}