using bnhtrade.Core.Data.Amazon.Report;
using bnhtrade.Core.Data.Database.UnitOfWork;
using System;
using System.Linq;

namespace bnhtrade.Core.Logic.Import
{
    public class AmazonSettlement
    {
        private readonly IUnitOfWork _providedUnitOfWork = null;
        private readonly bool _ownsUnitOfWork = false;
        private Data.Amazon.Report.SettlementReport amazonReport;
        private Logic.Log.LogEvent log = new Log.LogEvent();

        public AmazonSettlement()
        {
            _ownsUnitOfWork = true;
        }

        internal AmazonSettlement(IUnitOfWork unitOfWork)
        {
            _providedUnitOfWork = unitOfWork ?? throw new ArgumentNullException(nameof(unitOfWork));
            _ownsUnitOfWork = false;
        }

        public void SyncDatabase()
        {
            string operation = "Import Amazon Settlement Reports";
            log.LogInformation("Started '" + operation + "' operation.");

            // get avaiable reports from amazon api
            IUnitOfWork currentUow = null;
            if (_ownsUnitOfWork)
            {
                currentUow = new UnitOfWork();
            }
            else
            {
                currentUow = _providedUnitOfWork;
            }



            using (currentUow != null && _ownsUnitOfWork ? currentUow : null)
            {
                // get avaiable reports from amazon api
                var spapiReportIdList = amazonReport.ListAvaliableReports();
                int reportCount = spapiReportIdList.Count();

                if (reportCount == 0)
                {
                    log.LogInformation("Exiting '" + operation + "' operation. No settlement reports availble on Amazon SP-API.");
                    return;
                }

                // query db and remove reports that have already been imported
                var dbReportList = currentUow.ImportAmazonRepository.ReadAmazonSettlementHeaderInfoBySpapiReportId(spapiReportIdList);
                foreach (var dbReport in dbReportList)
                {
                    if (dbReport.SpapiReportIdIsSet)
                    {
                        for (int i = 0; i < spapiReportIdList.Count; i++)
                        {
                            if (spapiReportIdList[i] == dbReport.SpapiReportId)
                            {
                                spapiReportIdList.RemoveAt(i);
                                i--;
                                break;
                            }
                        }
                    }
                }

                if (!spapiReportIdList.Any())
                {
                    log.LogInformation("Exiting '" + operation + "' operation. No new reports to import (" + reportCount + " avaibale).");
                    return;
                }

                // import into database
                for (int i = 0; i < spapiReportIdList.Count(); i++)
                {
                    UI.Console.WriteLine("Importing settlement report " + (i + 1) + " of " + spapiReportIdList.Count() + " (ReportID:" + spapiReportIdList[i] + ").");
                    var filePath = amazonReport.GetReportFile(spapiReportIdList[i]);
                    bool ack = currentUow.ImportAmazonRepository.CreateAmazonSettlements(filePath, spapiReportIdList[i]);
                    log.LogInformation("Settlment Report imported  (ReportID:" + spapiReportIdList[i] + ").");
                }

                if (_ownsUnitOfWork)
                {
                    currentUow.Commit();
                }
                return;
            }
        }
    }
}