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

namespace Nuuru.Server.Data.EntityConfigurations
{
    public class WatchConfiguration : IEntityTypeConfiguration<Models.Watch>
    {
        public void Configure(EntityTypeBuilder<Models.Watch> builder)
        {
            builder.HasKey(w => w.Id);

            // Cascade delete: when user is deleted, remove their watches
            builder.HasOne(w => w.User)
                .WithMany()
                .HasForeignKey(w => w.UserId)
                .OnDelete(DeleteBehavior.Cascade);

            // Unique constraint: one watch per user per target
            builder.HasIndex(w => new { w.UserId, w.TargetType, w.TargetId })
                .IsUnique();

            // Index for querying watchers of a target
            builder.HasIndex(w => new { w.TargetType, w.TargetId });
        }
    }
}