using System.Collections.Generic;
using System.Linq;
using System.ServiceModel;
using HeuristicLab.Services.Optimization.Billing.DataAccess;
using HeuristicLab.Services.Optimization.Billing.Interfaces;
using HeuristicLab.Services.Optimization.Billing.Model;

namespace HeuristicLab.Services.Optimization.Billing.Business {
  [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)]
  public class BillingService : IOptimizationBilling {
    #region Properties

    private BillingDao billingDao;
    private BillingDao BillingDao {
      get {
        if (billingDao == null) billingDao = new BillingDao();
        return billingDao;
      }
    }

    private ITransactionManager transaction;
    private ITransactionManager Transaction {
      get {
        if (transaction == null) transaction = new TransactionManager();
        return transaction;
      }
    }

    #endregion

    #region Product Methods

    public IList<Product> GetProducts() {
      //TODO: Authentication
      return Transaction.UseTransaction(() => {
        return BillingDao.FindAllProducts().ToList();
      });
    }

    public IList<Product> GetProductByName(string productName) {
      //TODO: Authentication
      return Transaction.UseTransaction(() => {
        return BillingDao.FindProdcutBy(prod => prod.Name == productName).ToList();
      });
    }

    #endregion

    #region Order Methods

    public void SaveOrder(Order order) {
      //TODO: Authentication
      Transaction.UseTransaction(() => {
        BillingDao.InsertOrUpdateOrder(order);
      });
    }

    public IList<Order> GetOrdersByState(OrderState state) {
      //TODO: Authentication
      return Transaction.UseTransaction(() => {
        return BillingDao.FindOrderBy(order => order.StateValue == (int)state).ToList();
      });
    }

    public IList<Order> GetOrders(string userName) {
      //TODO: Authentication
      return Transaction.UseTransaction(() => {
        User user = GetUser(userName);
        return BillingDao.FindOrderBy(order => order.User == user).ToList();
      });
    }

    public void UpdateOrder(Order order) {
      //TODO: Authentication
      Transaction.UseTransaction(() => {
        BillingDao.InsertOrUpdateOrder(order);
      });
    }

    #endregion

    #region User Methods

    public User GetUser(string userName) {
      //TODO: Authentication
      return Transaction.UseTransaction(() => {
        return BillingDao.FindUserBy(u => u.Name == userName).First();
      });
    }

    public void SaveUser(User user) {
      //TODO: Authentication
      Transaction.UseTransaction(() => {
        BillingDao.InsertOrUpdateUser(user);
      });
    }

    #endregion

    #region UsageRecords Methods

    public IList<UsageRecord> GetUsageRecords(string userName) {
      //TODO: Authentication
      return Transaction.UseTransaction(() => {
        User user = GetUser(userName);
        return BillingDao.FindUsageRecordsBy(ur => ur.User == user).ToList();
      });
    }

    public IList<UsageRecord> GetUsageRecords(string username, System.DateTime from, System.DateTime to) {
      throw new System.NotImplementedException();
    }

    #endregion

    #region Invoice Methods

    public IList<Invoice> GetInvoices(string userName) {
      //TODO: Authentication
      return Transaction.UseTransaction(() => {
        User user = GetUser(userName);
        return BillingDao.FindInvoiceBy(inv => inv.User == user).ToList();
      });
    }

    public void SaveInvoice(Invoice invoice) {
      //TODO: Authentication
      Transaction.UseTransaction(() => {
        BillingDao.InsertOrUpdateInvoice(invoice);
      });
    }

    #endregion
  }
}