using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Net.Http;
using BITKit;
using Cysharp.Threading.Tasks;
using Microsoft.Extensions.Logging;

namespace Net.BITKit.Localization
{
    public class CsvLocalizationService
    {
        public string Url { get; set; } =
            @"http://server.bitfall.icu:21982/com.project.b/net.project.b.localization.csv";

        private readonly ILogger<CsvLocalizationService> _logger;
        private readonly ILocalizationService _localizationService;

        public CsvLocalizationService(ILocalizationService localizationService, ILogger<CsvLocalizationService> logger)
        {
            _localizationService = localizationService;
            _logger = logger;

            _localizationService.OnLanguageChangeAsync += OnLanguageChangeAsync;
        }
        
        public static Dictionary<string, Dictionary<string, string>> ParseCsvToDictionary(string csvData)
        {
            var dict = new Dictionary<string, Dictionary<string, string>>();
            using var reader = new StringReader(csvData);

            var headerLine = reader.ReadLine();
            if (headerLine == null) return dict;

            var headers = headerLine.Split(',');

            for (var i = 1; i < headers.Length; i++) // 跳过 "Key" 列
            {
                var header = headers[i];
                if (dict.ContainsKey(header) is false)
                {
                    dict.Add(header, new Dictionary<string, string>());
                }
            }

            string? line;
            while ((line = reader.ReadLine()) != null)
            {
                var columns = line.Split(',');
                if (columns.Length < 2) continue;

                var key = columns[0]; // 取 Key 值
                for (var i = 1; i < columns.Length; i++)
                {
                    if(i>headers.Length-1)continue;
                    var header = headers[i];
                    if (dict.TryGetValue(header, out var d) is false)
                    {
                        d = new Dictionary<string, string>();
                        dict.Add(header,d);
                    }
                    d.Set(key,columns[i]);
                    //dict[headers[i]][key] = columns[i]; // 填充语言数据
                }
            }

            return dict;
        }

        private async UniTask OnLanguageChangeAsync(string arg1, string arg2)
        {
            var csv = await new HttpClient().GetStringAsync(Url+$"?{DateTime.Now.Ticks}");
            
            _logger.LogInformation($"下载完成:\n{csv}");
            
            foreach (var (lang, dictionary) in ParseCsvToDictionary(csv))
            {
                if (_localizationService.LocalizedStrings.TryGetValue(lang, out var currentDictionary) is false)
                {
                    currentDictionary = new Dictionary<string, string>();
                    _localizationService.LocalizedStrings.Add(lang,currentDictionary);
                }
                foreach (var (key, value) in dictionary)
                {
                    currentDictionary.Set(key, value);
                }
            }
        }
    }

}