using System;
using System.Collections.Generic;
using CandyHouseBase.Exceptions;
using CandyHouseBase.Extensions;
using CandyHouseBase.Infrastructure;

namespace CandyHouseBase.DataModels
{
    public class OrderDataModel : IValidation
    {
        public string Id { get; private set; }
        public string CustomerId { get; private set; } // Может быть null, если клиент разовый
        public DateTime OrderDate { get; private set; }
        public decimal TotalAmount { get; private set; }
        public decimal DiscountAmount { get; private set; }
        public List<OrderItemDataModel> OrderItems { get; private set; }
        public bool IsCompleted { get; private set; }

        public OrderDataModel(string id, string customerId, DateTime orderDate, decimal totalAmount,
            decimal discountAmount, List<OrderItemDataModel> orderItems, bool isCompleted)
        {
            Id = id;
            CustomerId = customerId;
            OrderDate = orderDate;
            TotalAmount = totalAmount;
            DiscountAmount = discountAmount;
            OrderItems = orderItems;
            IsCompleted = isCompleted;
        }

        public void Validate()
        {
            if (Id.IsEmpty()) throw new ValidationException("Field Id is empty");
            if (!Id.IsGuid()) throw new ValidationException("Id must be a GUID");
            if (!CustomerId.IsEmpty() && !CustomerId.IsGuid())
                throw new ValidationException("CustomerId must be a GUID or empty");
            if (OrderItems == null || OrderItems.Count == 0)
                throw new ValidationException("Order must contain at least one product");
            if (TotalAmount < 0) throw new ValidationException("TotalAmount cannot be negative");
            if (DiscountAmount < 0) throw new ValidationException("DiscountAmount cannot be negative");
        }

        public void MarkAsCompleted()
        {
            IsCompleted = true;
        }
    }
}