using System;
using System.Collections.Generic;

namespace AfterHours.Economy
{
    /// <summary>Eine Position einer Großhandelsbestellung.</summary>
    [Serializable]
    public struct OrderLine
    {
        public int ProductId;
        public int Quantity;
        public float UnitPrice;

        public float LineTotal => Quantity * UnitPrice;
    }

    /// <summary>Bestellung beim Großhandel. Wird nur serverseitig gehalten.</summary>
    public sealed class PurchaseOrder
    {
        private readonly List<OrderLine> _lines = new();

        public IReadOnlyList<OrderLine> Lines => _lines;

        /// <summary>Spielzeit in Sekunden, zu der die Lieferung eintrifft.</summary>
        public float DeliveryTime { get; set; }

        public bool Delivered { get; set; }

        public void Add(int productId, int quantity, float unitPrice)
        {
            if (quantity <= 0) return;
            _lines.Add(new OrderLine { ProductId = productId, Quantity = quantity, UnitPrice = unitPrice });
        }

        public float Total()
        {
            float sum = 0f;
            foreach (var line in _lines) sum += line.LineTotal;
            return sum;
        }
    }
}