using System.Globalization;
using Newtonsoft.Json;
using NadekoBot.Db;

namespace NadekoBot.Services;

public class Localization : ILocalization, INService
{
    private readonly BotConfigService _bss;
    private readonly DbService _db;

    public ConcurrentDictionary<ulong, CultureInfo> GuildCultureInfos { get; }
    public CultureInfo DefaultCultureInfo => _bss.Data.DefaultLocale;

    private static readonly Dictionary<string, CommandData> _commandData = JsonConvert.DeserializeObject<Dictionary<string, CommandData>>(
        File.ReadAllText("./data/strings/commands/commands.en-US.json"));

    public Localization(BotConfigService bss, Bot bot, DbService db)
    {
        _bss = bss;
        _db = db;

        var cultureInfoNames = bot.AllGuildConfigs
            .ToDictionary(x => x.GuildId, x => x.Locale);
            
        GuildCultureInfos = new(cultureInfoNames.ToDictionary(x => x.Key, x =>
        {
            CultureInfo cultureInfo = null;
            try
            {
                if (x.Value is null)
                    return null;
                cultureInfo = new(x.Value);
            }
            catch { }
            return cultureInfo;
        }).Where(x => x.Value != null));
    }

    public void SetGuildCulture(IGuild guild, CultureInfo ci) =>
        SetGuildCulture(guild.Id, ci);

    public void SetGuildCulture(ulong guildId, CultureInfo ci)
    {
        if (ci.Name == _bss.Data.DefaultLocale.Name)
        {
            RemoveGuildCulture(guildId);
            return;
        }

        using (var uow = _db.GetDbContext())
        {
            var gc = uow.GuildConfigsForId(guildId, set => set);
            gc.Locale = ci.Name;
            uow.SaveChanges();
        }

        GuildCultureInfos.AddOrUpdate(guildId, ci, (id, old) => ci);
    }

    public void RemoveGuildCulture(IGuild guild) =>
        RemoveGuildCulture(guild.Id);

    public void RemoveGuildCulture(ulong guildId)
    {

        if (GuildCultureInfos.TryRemove(guildId, out var _))
        {
            using var uow = _db.GetDbContext();
            var gc = uow.GuildConfigsForId(guildId, set => set);
            gc.Locale = null;
            uow.SaveChanges();
        }
    }

    public void SetDefaultCulture(CultureInfo ci)
        => _bss.ModifyConfig(bs =>
        {
            bs.DefaultLocale = ci;
        });

    public void ResetDefaultCulture() =>
        SetDefaultCulture(CultureInfo.CurrentCulture);

    public CultureInfo GetCultureInfo(IGuild guild) =>
        GetCultureInfo(guild?.Id);

    public CultureInfo GetCultureInfo(ulong? guildId)
    {
        if (guildId is null || !GuildCultureInfos.TryGetValue(guildId.Value, out var info) || info is null)
            return _bss.Data.DefaultLocale;
            
        return info;
    }

    public static CommandData LoadCommand(string key)
    {
        _commandData.TryGetValue(key, out var toReturn);

        if (toReturn is null)
            return new()
            {
                Cmd = key,
                Desc = key,
                Usage = new[] { key },
            };

        return toReturn;
    }
}