using Microsoft.Extensions.Logging;
using LDBproject.Entities;
using LDBproject.Repositories;
using LDBproject.Reports;

internal class ChartReport
{
    private readonly IUpdateRep _updR;
    private readonly ILogger<ChartReport> _logger;

    public ChartReport(IUpdateRep updR, ILogger<ChartReport> logger)
    {
        _updR = updR ?? throw new ArgumentNullException(nameof(updR));
        _logger = logger ?? throw new ArgumentNullException(nameof(logger));
    }

    public bool CreateChart(string filePath, DateTime dateTime)
    {
        try
        {
            var updates = _updR.GetUpdateList().ToList(); // Materialize the query
            var data = GetData(updates, dateTime);

            System.Text.Encoding.RegisterProvider(System.Text.CodePagesEncodingProvider.Instance);

            new PdfBuilder(filePath).AddHeader("Card Updates")  // More descriptive header
                .AddPieChart("Number of Times Card Updated", data) // Corrected caption
                .Build();
            return true;
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error creating chart.");
            return false;
        }
    }

    private List<(string Caption, double Value)> GetData(List<UpdateC> updates, DateTime date)
    {
        var result = new List<(string Caption, double Value)>();

        var distinctCards = updates.Where(u => u.LastUpdate.Date == date.Date) // Filter by date
                                   .GroupBy(u => u.CardID)
                                   .Select(g => new { CardID = g.Key, Count = g.Count() })
                                   .ToList();


        foreach (var cardData in distinctCards)
        {
            result.Add(($"Card {cardData.CardID}", cardData.Count));
        }

        return result;
    }

}