using ClaudeDo.Data.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;

namespace ClaudeDo.Data.Configuration;

public class TaskDependencyEntityConfiguration : IEntityTypeConfiguration<TaskDependencyEntity>
{
    public void Configure(EntityTypeBuilder<TaskDependencyEntity> builder)
    {
        builder.ToTable("task_dependencies");

        builder.HasKey(d => new { d.TaskId, d.DependsOnTaskId });
        builder.Property(d => d.TaskId).HasColumnName("task_id");
        builder.Property(d => d.DependsOnTaskId).HasColumnName("depends_on_task_id");

        // Cascade on both sides reproduces what the old single depends_on_task_id column got from
        // ON DELETE SET NULL: deleting the predecessor drops the edge, so the dependent becomes
        // pickable rather than blocked forever on a task that no longer exists.
        builder.HasOne<TaskEntity>()
            .WithMany(t => t.Dependencies)
            .HasForeignKey(d => d.TaskId)
            .OnDelete(DeleteBehavior.Cascade);

        builder.HasOne<TaskEntity>()
            .WithMany()
            .HasForeignKey(d => d.DependsOnTaskId)
            .OnDelete(DeleteBehavior.Cascade);

        builder.HasIndex(d => d.DependsOnTaskId).HasDatabaseName("idx_task_dependencies_depends_on");
    }
}