using System.Data.Entity;
using System.Data.Entity.ModelConfiguration;
using System.Data.Entity.ModelConfiguration.Conventions;
using HeuristicLab.Services.Optimization.Billing.Model;

namespace HeuristicLab.Services.Optimization.Billing.DataAccess {
  public class BillingContext : DbContext {
    public DbSet<ContactInformation> ContactInformations { get; set; }
    public DbSet<Product> Products { get; set; }
    public DbSet<User> Users { get; set; }
    public DbSet<Order> Orders { get; set; }
    public DbSet<OrderLine> OrderLines { get; set; }
    public DbSet<Invoice> Invoices { get; set; }
    public DbSet<InvoiceLine> InvoiceLines { get; set; }
    public DbSet<UsageRecord> UsageRecords { get; set; }

    // enum PaymentMethod
    // enum OrderState 

    public BillingContext()
      : base("name=BillingContext") {

    }

    public BillingContext(string connectionString)
      : base(connectionString) {

    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder) {
      modelBuilder.Configurations.Add(new OrderConfiguration());
      modelBuilder.Configurations.Add(new OrderLineConfiguration());
      modelBuilder.Configurations.Add(new InvoiceConfiguration());
      modelBuilder.Configurations.Add(new InvoiceLineConfiguration());
      modelBuilder.Configurations.Add(new UsageRecordConfiguration());

      modelBuilder.Conventions.Remove<OneToManyCascadeDeleteConvention>();

      base.OnModelCreating(modelBuilder);
    }

    #region EntityTypeConfigurations

    private class OrderConfiguration : EntityTypeConfiguration<Order> {
      internal OrderConfiguration() {
        this.HasRequired(o => o.User).WithMany().HasForeignKey(o => o.UserId);
        // TODO: OrderState?
      }
    }

    private class OrderLineConfiguration : EntityTypeConfiguration<OrderLine> {
      internal OrderLineConfiguration() {
        this.HasRequired(ol => ol.Order).WithMany(o => o.OrderLines).HasForeignKey(ol => ol.OrderId).WillCascadeOnDelete(true);
        this.HasRequired(ol => ol.Product).WithMany().HasForeignKey(ol => ol.ProductId);
      }
    }

    private class InvoiceConfiguration : EntityTypeConfiguration<Invoice> {
      internal InvoiceConfiguration() {
        this.HasRequired(i => i.User).WithMany().HasForeignKey(i => i.UserId);
        this.HasRequired(i => i.Order).WithMany(o => o.Invoices).HasForeignKey(i => i.OrderId);
      }
    }

    private class InvoiceLineConfiguration : EntityTypeConfiguration<InvoiceLine> {
      internal InvoiceLineConfiguration() {
        this.HasRequired(il => il.Invoice).WithMany(i => i.InvoiceLines).HasForeignKey(il => il.InvoiceId).WillCascadeOnDelete(true);
        this.HasRequired(il => il.Product).WithMany().HasForeignKey(il => il.ProductId);
      }
    }

    private class UsageRecordConfiguration : EntityTypeConfiguration<UsageRecord> {
      internal UsageRecordConfiguration() {
        this.HasRequired(ur => ur.User).WithMany().HasForeignKey(ur => ur.UserId);
        this.HasRequired(ur => ur.Product).WithMany().HasForeignKey(ur => ur.ProductId);
      }
    }

    #endregion

    #region DB Seed Methods

    public class BillingContextInitiliazer : DropCreateDatabaseIfModelChanges<BillingContext> {
      protected override void Seed(BillingContext context) {
        context.Products.Add(new Model.Product() {
          Name = "Optimization-as-a-Service - Experiment execution",
          Description = "Create and run your experiments within HeuristicLab Hive",
          ProductId = 1,
          Price = 10.0,
          ProductType = "Optimization Service"
        });
        context.SaveChanges();
      }
    }

    #endregion
  }
}