using System;
using System.Collections.Generic;
using System.Linq;
using Database.Models;
using Database.Repository;
using Pos.Models;

namespace Pos.Service
{
    public class SaleHistoryService
    {
        private readonly SaleRepository _saleRepository =
            new SaleRepository();

        public List<ReceiptSummaryModel> Search(
            DateTime startDate,
            DateTime endDate)
        {
            if (endDate.Date < startDate.Date)
                throw new ArgumentException(
                    "Slutdatoen må ikke ligge før startdatoen.");

            List<SaleEntity> sales =
                _saleRepository.GetByDateRange(startDate, endDate);

            List<ReceiptSummaryModel> receipts =
                new List<ReceiptSummaryModel>();

            foreach (SaleEntity sale in sales)
            {
                decimal total = _saleRepository
                    .GetSaleLineBySaleId(sale.Id)
                    .Sum(line => line.Total);

                receipts.Add(new ReceiptSummaryModel
                {
                    SaleId = sale.Id,
                    SaleTime = sale.Time,
                    Total = total
                });
            }

            return receipts;
        }

        public ReceiptDetailModel GetReceipt(int saleId)
        {
            if (saleId <= 0)
                throw new ArgumentOutOfRangeException(nameof(saleId));

            List<SaleLineEntity> saleLines =
                _saleRepository.GetSaleLineBySaleId(saleId);

            ReceiptDetailModel receipt = new ReceiptDetailModel
            {
                SaleId = saleId
            };

            foreach (SaleLineEntity saleLine in saleLines)
            {
                receipt.Lines.Add(new ReceiptLineModel
                {
                    Product = saleLine.Product,
                    Pieces = saleLine.Pieces,
                    Price = saleLine.Price,
                    Total = saleLine.Total
                });
            }

            receipt.Total = receipt.Lines.Sum(line => line.Total);
            return receipt;
        }
    }
}