using FinlyticCore.Dtos.Assets;
using FinlyticCore.Entities.Assets;

namespace FinlyticCore.Util;

public static class AssetMapper
{
    /// <summary>
    /// Mappt eine AssetEntity (Datenbank) sicher auf ein zyklusfreies AssetDto (MQTT Payload).
    /// </summary>
    public static AssetDto ToDto(this AssetEntity entity)
    {
        // 1. Tags zyklusfrei mappen
        var dtoTags = entity.Tags.Select(t => new TagDto 
        { 
            Id = t.Id, 
            Name = t.Name, 
            Type = t.Type 
        }).ToList();

        // 2. Polymorphes Mapping basierend auf dem Laufzeittyp
        return entity switch
        {
            StockEntity stock => new StockDto
            {
                Isin = stock.Isin, Name = stock.Name, Type = stock.Type, InstrumentCategory = stock.InstrumentCategory, HasCfd = stock.HasCfd, ImageId = stock.ImageId, UpdateAt = stock.UpdateAt, LastUpdatedAt = stock.LastUpdatedAt, Tags = dtoTags,
                DerivativeProductCategories = stock.DerivativeProductCategories
            },
            EtfEntity etf => new EtfDto
            {
                Isin = etf.Isin, Name = etf.Name, Type = etf.Type, InstrumentCategory = etf.InstrumentCategory, HasCfd = etf.HasCfd, ImageId = etf.ImageId, UpdateAt = etf.UpdateAt, LastUpdatedAt = etf.LastUpdatedAt, Tags = dtoTags,
                DerivativeProductCategories = etf.DerivativeProductCategories, EtfDescription = etf.EtfDescription, MappedEtfIndexName = etf.MappedEtfIndexName, Subtitle = etf.Subtitle, SearchSubtitle = etf.SearchSubtitle
            },
            CryptoEntity crypto => new CryptoDto
            {
                Isin = crypto.Isin, Name = crypto.Name, Type = crypto.Type, InstrumentCategory = crypto.InstrumentCategory, HasCfd = crypto.HasCfd, ImageId = crypto.ImageId, UpdateAt = crypto.UpdateAt, LastUpdatedAt = crypto.LastUpdatedAt, Tags = dtoTags,
                Subtitle = crypto.Subtitle, SearchSubtitle = crypto.SearchSubtitle
            },
            BondEntity bond => new BondDto
            {
                Isin = bond.Isin, Name = bond.Name, Type = bond.Type, InstrumentCategory = bond.InstrumentCategory, HasCfd = bond.HasCfd, ImageId = bond.ImageId, UpdateAt = bond.UpdateAt, LastUpdatedAt = bond.LastUpdatedAt, Tags = dtoTags,
                BondIssuerName = bond.BondIssuerName, SearchSubtitle = bond.SearchSubtitle
            },
            DerivativeEntity deriv => new DerivativeDto
            {
                Isin = deriv.Isin, Name = deriv.Name, Type = deriv.Type, InstrumentCategory = deriv.InstrumentCategory, HasCfd = deriv.HasCfd, ImageId = deriv.ImageId, UpdateAt = deriv.UpdateAt, LastUpdatedAt = deriv.LastUpdatedAt, Tags = dtoTags,
                DerivativeProductCategories = deriv.DerivativeProductCategories, UnderlyingIsin = deriv.UnderlyingIsin
            },
            SyntheticEntity synth => new SyntheticDto
            {
                Isin = synth.Isin, Name = synth.Name, Type = synth.Type, InstrumentCategory = synth.InstrumentCategory, HasCfd = synth.HasCfd, ImageId = synth.ImageId, UpdateAt = synth.UpdateAt, LastUpdatedAt = synth.LastUpdatedAt, Tags = dtoTags,
                DerivativeProductCategories = synth.DerivativeProductCategories
            },
            _ => throw new NotSupportedException($"Mapping for type {entity.GetType().Name} is not supported.")
        };
    }

    /// <summary>
    /// Mappt direkt eine ganze Liste von AssetEntities.
    /// </summary>
    public static List<AssetDto> ToDtoList(this IEnumerable<AssetEntity> entities)
    {
        return entities.Select(e => e.ToDto()).ToList();
    }
}