using System;
using System.Linq;
using System.Collections.Generic;
using System.Text;

namespace APT.Infrastructure.Core
{
    public class LibMessageFormatManager
    {
        private static LibMessageFormatManager _entityConfigManager = null;
        private readonly List<LibMessageFormat> _formats = new List<LibMessageFormat>();

        public static LibMessageFormatManager Instance
        {
            get
            {
                if (_entityConfigManager == null)
                    _entityConfigManager = new LibMessageFormatManager();
                return _entityConfigManager;
            }
        }

        public List<LibMessageFormat> Formats { get { return _formats; } }

        public LibMessageFormatManager()
        {

        }

        public string GetMessageFormat(string code, string lang)
        {
            var f = Formats.FirstOrDefault(t => string.Compare(t.Code, code, true) == 0);
            if (f == null) throw new Exception(" message code[" + code + "] is not exist");
            var ret = f.GetFormat(lang);
            if (string.IsNullOrEmpty(ret)) throw new Exception("error message lang " + lang);
            return ret;
        }
        public void AddMessageFormat(LibMessageFormat format)
        {
            if (string.IsNullOrEmpty(format.Code)) return;
            var old = Formats.FirstOrDefault(t => string.Compare(t.Code, format.Code, true) == 0);
            if (old != null) Formats.Remove(old);
            Formats.Add(format);
        }

    }

    public class LibMessageFormat
    {
        private readonly List<LibMessageFormatInfo> _formatInfos;
        public LibMessageFormat()
        {
            _formatInfos = new List<LibMessageFormatInfo>();
        }

        public string Code { get; set; } 

        public void AddFormat(string lang,string format)
        {
            if (string.IsNullOrEmpty(format)) return;
            var f = _formatInfos.FirstOrDefault(t => string.Compare(t.Lang, lang, true) == 0);
            if (f != null) _formatInfos.Remove(f);
            var info = new LibMessageFormatInfo()
            {
                Lang = lang,
                Format = format,
            };
            _formatInfos.Add(info);
        }

        public string GetFormat(string lang)
        {
            var f = _formatInfos.FirstOrDefault(t => string.Compare(t.Lang, lang, true) == 0);
            if (f != null) return f.Format;
            if (_formatInfos.Any())
            {
                var r = _formatInfos.FirstOrDefault(t => string.IsNullOrEmpty(t.Lang));
                if (r != null) return r.Format;
            }
            return null;
        }

    }
    public class LibMessageFormatInfo
    {
        public string Lang { get; set; }

        public string Format { get; set; }
    }
}