using ControlCenter.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;

namespace ControlCenter.Data.Configurations;

/// <summary>
/// EF Core entity configuration for <see cref="AgentState"/>.
///
/// <para>Maps to the <c>agents</c> table with snake_case column naming,
/// consistent with the Extrudex project conventions.</para>
///
/// <para>CUB-56 will create the migration; this configuration only
/// defines the entity-to-table mapping and constraints.</para>
/// </summary>
public class AgentStateConfiguration : IEntityTypeConfiguration<AgentState>
{
    public void Configure(EntityTypeBuilder<AgentState> builder)
    {
        // Table name
        builder.ToTable("agents");

        // Primary key
        builder.HasKey(a => a.Id);

        // Properties with snake_case column names
        builder.Property(a => a.Id)
            .HasColumnName("id")
            .ValueGeneratedOnAdd();

        builder.Property(a => a.Status)
            .HasColumnName("status")
            .IsRequired()
            .HasMaxLength(20)
            .HasDefaultValue("idle");

        builder.Property(a => a.Task)
            .HasColumnName("task")
            .IsRequired(false)
            .HasMaxLength(500);

        builder.Property(a => a.Progress)
            .HasColumnName("progress")
            .IsRequired(false);

        builder.Property(a => a.SessionKey)
            .HasColumnName("session_key")
            .IsRequired()
            .HasMaxLength(255);

        builder.Property(a => a.Channel)
            .HasColumnName("channel")
            .IsRequired()
            .HasMaxLength(50);

        builder.Property(a => a.LastActivity)
            .HasColumnName("last_activity")
            .IsRequired()
            .HasDefaultValueSql("NOW()");

        // Indexes
        builder.HasIndex(a => a.SessionKey)
            .IsUnique()
            .HasDatabaseName("ix_agents_session_key");

        builder.HasIndex(a => a.Status)
            .HasDatabaseName("ix_agents_status");
    }
}