using JSMR.Application.Common;
using JSMR.Application.Integrations.DLSite.Models;
using JSMR.Infrastructure.Integrations.DLSite.Models;

namespace JSMR.Infrastructure.Integrations.DLSite.Mapping;

public static class DLSiteToDomainMapper
{
    private const string OptTrial = "TRI";
    private const string OptDLPlay = "DLP";
    private const string OptReviews = "REV";
    private const string OptOfficialTranslation = "DOT";

    private const string OptAIFull = "AIG";
    private const string OptAIPartial = "AIP";

    private static readonly (string Code, Language Lang)[] SupportedLanguageFlags =
    [
        ("JPN", Language.Japanese),
        ("ENG", Language.English),
        ("CHI", Language.ChineseTraditional),
        ("CHI_HANT", Language.ChineseTraditional),
        ("CHI_HANS", Language.ChineseSimplified)
    ];

    private static readonly Dictionary<string, Language> TranslationLanguageMap =
       SupportedLanguageFlags.ToDictionary(x => x.Code, x => x.Lang, StringComparer.OrdinalIgnoreCase);

    public static VoiceWorkDetailCollection Map(ProductInfoCollection? productInfoCollection)
    {
        VoiceWorkDetailCollection result = [];

        if (productInfoCollection is null)
            return result;

        foreach (var keyValue in productInfoCollection)
        {
            string productId = keyValue.Key;
            ProductInfo productInfo = keyValue.Value;

            VoiceWorkDetails voiceWorkDetails = Map(productInfo);
            result[productId] = voiceWorkDetails;
        }

        return result;
    }

    public static VoiceWorkDetails Map(ProductInfo productInfo)
    {
        ArgumentNullException.ThrowIfNull(productInfo);

        string[] options = [.. productInfo.Options.Where(s => !string.IsNullOrWhiteSpace(s))];
        HashSet<string> optionsSet = new(options, StringComparer.OrdinalIgnoreCase);

        return new VoiceWorkDetails
        {
            Series = MapSeries(productInfo),
            Translation = MapTranslation(productInfo, optionsSet),
            WishlistCount = productInfo.WishlistCount,
            DownloadCount = productInfo.DownloadCount,
            RegistrationDate = productInfo.RegistrationDate,
            SupportedLanguages = MapSupportedLanguages(optionsSet),
            AI = MapAIGeneration(optionsSet),
            HasTrial = optionsSet.Contains(OptTrial),
            HasDLPlay = optionsSet.Contains(OptDLPlay),
            HasReviews = optionsSet.Contains(OptReviews)
        };
    }

    private static VoiceWorkSeries? MapSeries(ProductInfo productInfo)
    {
        if (string.IsNullOrWhiteSpace(productInfo.TitleId) || string.IsNullOrWhiteSpace(productInfo.TitleName))
            return null;

        return new VoiceWorkSeries
        {
            Identifier = productInfo.TitleId,
            Name = productInfo.TitleName
        };
    }

    private static VoiceWorkTranslation? MapTranslation(ProductInfo info, HashSet<string> options)
    {
        ProductTranslationInfo? translationInfo = info.TranslationInfo;

        if (translationInfo == null || string.IsNullOrWhiteSpace(translationInfo.OriginalWorkNumber) || string.IsNullOrWhiteSpace(translationInfo.Language))
            return null;

        string languageCode = translationInfo.Language.Trim();

        if (!options.Contains(languageCode))
            return null;

        if (!TranslationLanguageMap.TryGetValue(languageCode, out Language language))
            return null;

        string originalId = translationInfo.OriginalWorkNumber;
        bool isOfficial = options.Contains(OptOfficialTranslation);

        return new VoiceWorkTranslation
        {
            OriginalProductId = originalId,
            Language = language,
            IsOfficialTranslation = isOfficial
        };
    }

    private static Language[] MapSupportedLanguages(HashSet<string> options)
    {
        List<Language> languages = [];

        foreach (var (code, language) in SupportedLanguageFlags)
        {
            if (options.Contains(code) && !languages.Contains(language))
                languages.Add(language);
        }

        return [.. languages];
    }

    private static AIGeneration MapAIGeneration(HashSet<string> options)
    {
        if (options.Contains(OptAIFull))
            return AIGeneration.Full;

        if (options.Contains(OptAIPartial))
            return AIGeneration.Partial;

        return AIGeneration.None;
    }
}