using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Volo.Abp.DependencyInjection;
using Volo.Abp.Localization;

namespace Sanhe.Abp.Localization.Dynamic;

[Dependency(ServiceLifetime.Transient, ReplaceServices = true)]
[ExposeServices(
    typeof(ILanguageProvider),
    typeof(DynamicLanguageProvider))]
public class DynamicLanguageProvider : ILanguageProvider
{
    protected ILocalizationStore Store { get; }
    protected AbpLocalizationOptions Options { get; }

    public DynamicLanguageProvider(
        ILocalizationStore store,
        IOptions<AbpLocalizationOptions> options)
    {
        Store = store;
        Options = options.Value;
    }

    public async virtual Task<IReadOnlyList<LanguageInfo>> GetLanguagesAsync()
    {
        var languages = await Store.GetLanguageListAsync();

        if (!languages.Any())
        {
            return Options.Languages;
        }

        return languages
            .Distinct(new LanguageInfoComparer())
            .ToList();
    }
}