I18NCommander/I18N Commander/Processor/DeepL.cs

using DataModel.Database;
using DeepL;

namespace Processor;

public static class DeepL
{
    private static bool DEEPL_NOT_AVAILABLE = false;
    
    public readonly record struct DeepLUsage(bool Enabled, long CharacterCount, long CharacterLimit, bool AuthIssue = false);
    
    public static async Task<DeepLUsage> GetUsage()
    {
        if(DEEPL_NOT_AVAILABLE)
            return new DeepLUsage(false, 0, 1);
        
        if (await AppSettings.GetDeepLMode() == SettingDeepLMode.DISABLED)
            return new DeepLUsage(false, 0, 1);

        var deepLAPIKey = await AppSettings.GetDeepLAPIKey();
        if(string.IsNullOrWhiteSpace(deepLAPIKey))
            return new DeepLUsage(false, 0, 1);

        try
        {
            using var deepl = new Translator(deepLAPIKey);
            var usage = await deepl.GetUsageAsync();
        
            return new DeepLUsage(true, usage.Character!.Count, usage.Character.Limit);
        }
        catch (AuthorizationException)
        {
            DEEPL_NOT_AVAILABLE = true;
            return new DeepLUsage(false, 0, 1, true);
        }
    }
    
    public static async Task<string> Translate(string text, string targetCulture)
    {
        if (DEEPL_NOT_AVAILABLE)
            return string.Empty;

        if (string.IsNullOrWhiteSpace(text))
            return string.Empty;
        
        if (await AppSettings.GetDeepLMode() == SettingDeepLMode.DISABLED)
            return string.Empty;

        var deepLAPIKey = await AppSettings.GetDeepLAPIKey();
        if(string.IsNullOrWhiteSpace(deepLAPIKey))
            return string.Empty;

        try
        {
            var sourceCultureIndex = await AppSettings.GetDeepLSourceCultureIndex();
            var sourceCulture = await AppSettings.GetCultureCode(sourceCultureIndex);
            
            // In case of the source culture, we cannot specify the region, so we need to remove it:
            sourceCulture = sourceCulture.Split('-')[0];
            
            using var deepl = new Translator(deepLAPIKey);
            var translation = await deepl.TranslateTextAsync(text, sourceCulture, targetCulture);
            
            return translation.Text;
        }
        catch (AuthorizationException)
        {
            DEEPL_NOT_AVAILABLE = true;
            return string.Empty;
        }
    }
}