using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;

public class LocalObservationConfiguration : IEntityTypeConfiguration<LocalObservation>
{
    public void Configure(EntityTypeBuilder<LocalObservation> builder)
    {
        builder.ToTable("observations", t =>
        {
            t.HasCheckConstraint("chk_observations_source",
                "source IN ('MANUAL', 'DEVICE', 'LAB')");
        });
        builder.HasKey(o => o.Id);
        builder.Property(o => o.Id).HasColumnName("id").HasDefaultValueSql("gen_random_uuid()");
        builder.Property(o => o.EncounterId).HasColumnName("encounter_id");
        builder.Property(o => o.ObservationCode).HasColumnName("observation_code").HasMaxLength(50).IsRequired();
        builder.Property(o => o.Value).HasColumnName("value").HasColumnType("decimal(10,3)").IsRequired();
        builder.Property(o => o.Unit).HasColumnName("unit").HasMaxLength(20).IsRequired();
        builder.Property(o => o.Source)
            .HasColumnName("source")
            .HasMaxLength(20)
            .HasConversion(
                v => v.ToDbString(),
                v => ObservationSourceExtensions.FromDbString(v))
            .HasDefaultValueSql("'MANUAL'")
            .HasSentinel((ObservationSource)(-1));
        builder.Property(o => o.IdempotencyKey).HasColumnName("idempotency_key").HasMaxLength(100);
        builder.Property(o => o.RecordedAt).HasColumnName("recorded_at");
        builder.Property(o => o.CreatedAt).HasColumnName("created_at").HasDefaultValueSql("NOW()");

        builder.HasOne(o => o.Encounter)
            .WithMany(e => e.Observations)
            .HasForeignKey(o => o.EncounterId)
            .OnDelete(DeleteBehavior.Restrict);

        builder.HasIndex(o => o.IdempotencyKey)
            .IsUnique()
            .HasFilter("idempotency_key IS NOT NULL");

        builder.HasIndex(o => new { o.EncounterId, o.ObservationCode, o.RecordedAt });
    }
}
