using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


namespace InterfaceWorkAreaData
{
    public class CheckFilePath
    {
        public static bool IsValidFilePath(string path)
        {
            if (string.IsNullOrWhiteSpace(path))
                return false;

            try
            {
                // 检查路径语法是否合法
                string fullPath = Path.GetFullPath(path);

                // 检查是否包含非法字符
                if (path.IndexOfAny(Path.GetInvalidPathChars()) >= 0)
                    return false;

                // 可选：检查文件名是否为空（如路径为 "C:\\" 是目录，不是文件）
                string fileName = Path.GetFileName(fullPath);
                if (string.IsNullOrEmpty(fileName) || fileName.Contains("."))
                    return true; // 允许无扩展名或有扩展名的文件名
                else
                    return false; // 路径末尾无文件名（可能是目录）

            }
            catch (ArgumentException)
            {
                return false;
            }
            catch (PathTooLongException)
            {
                return false;
            }
            catch (NotSupportedException)
            {
                return false;
            }
        }

        public static bool IsValidAndFileExists(string path)
        {
            return IsValidFilePath(path) && File.Exists(path);
        }
    }



    public enum eDataSourceType
    {
        empty,
        kep
    }

    public sealed class workAreaDb
    {
        private workAreaDb()
        {

        }

        private static readonly Lazy<workAreaDb> _instance = new Lazy<workAreaDb>(() => new workAreaDb());
        public static workAreaDb Instance => _instance.Value;

        public bool Connected(string dsname, eDataSourceType type)
        {
            bool b;
            if(type == eDataSourceType.empty)
            {
                this.workData = new emptyWorkAreaData();
                b = false;
            }
            else
            {
                string dbfilepath = dsname + "\\sys.db";// Path.GetDirectoryName(dsname + "\\sys.db");
                if (CheckFilePath.IsValidAndFileExists(dbfilepath))
                {

                    this.workData = new KepWorkAreaData();
                   b =  this.workData.Conn(dsname);
                }
                else
                {//检查工区的数据库路径失败
                    this.workData = new emptyWorkAreaData();
                    b = false;
                }
            }
            return b;
        }
        public IWorkAreaData workData { get; private set; }
    }
}