using MealPlan.Api.Models;
using Microsoft.EntityFrameworkCore;

namespace MealPlan.Api.Data;

/// <summary>
/// Database-first context for the existing PostgreSQL database.
/// Tables are mapped explicitly; this context never creates or alters schema.
/// </summary>
public class AppDbContext : DbContext
{
    public AppDbContext(DbContextOptions<AppDbContext> options) : base(options)
    {
    }

    public DbSet<Recipe> Recipes => Set<Recipe>();
    public DbSet<Ingredient> Ingredients => Set<Ingredient>();
    public DbSet<RecipeStep> RecipeSteps => Set<RecipeStep>();
    public DbSet<ApplicationUser> Users => Set<ApplicationUser>();

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
        
        modelBuilder.HasDefaultSchema("diet");

        modelBuilder.Entity<Recipe>(e =>
        {
            e.HasKey(r => r.Id);
            e.Property(r => r.Id).UseIdentityByDefaultColumn();
            e.Property(r => r.Protein).HasColumnType("numeric(6,2)");
            e.Property(r => r.Fat).HasColumnType("numeric(6,2)");
            e.Property(r => r.Carbs).HasColumnType("numeric(6,2)");

            e.HasMany(r => r.Ingredients)
                .WithOne(i => i.Recipe!)
                .HasForeignKey(i => i.RecipeId)
                .OnDelete(DeleteBehavior.Cascade);

            e.HasMany(r => r.Steps)
                .WithOne(s => s.Recipe!)
                .HasForeignKey(s => s.RecipeId)
                .OnDelete(DeleteBehavior.Cascade);
        });

        modelBuilder.Entity<Ingredient>(e =>
        {
            e.HasKey(i => i.Id);
            e.Property(i => i.Id).UseIdentityByDefaultColumn();
            e.Property(i => i.AmountGrams).HasColumnType("numeric(8,2)");
        });

        modelBuilder.Entity<RecipeStep>(e =>
        {
            e.HasKey(s => s.Id);
            e.Property(s => s.Id).UseIdentityByDefaultColumn();
        });

        modelBuilder.Entity<ApplicationUser>(e =>
        {
            e.HasKey(u => u.Id);
            e.Property(u => u.Id).HasColumnType("uuid");
        });
    }
}