using DevExpress.XtraReports.UI;
using DevExpress.XtraReports.Web.Extensions;
using EnvelopeGenerator.ReceiverUI.PredefinedReports;

namespace EnvelopeGenerator.ReceiverUI.Services;

public class InMemoryReportStorageWebExtension : ReportStorageWebExtension
{
    private const string DefaultReportName = "LargeDatasetReport";
    private static readonly Dictionary<string, byte[]> Reports = new(StringComparer.OrdinalIgnoreCase);

    public override bool CanSetData(string url) => IsValidUrl(url);

    public override byte[] GetData(string url)
    {
        url = NormalizeUrl(url);

        if (Reports.TryGetValue(url, out var reportLayout))
            return reportLayout;

        if (ReportsFactory.Reports.TryGetValue(url, out var reportFactory))
            return SaveReport(reportFactory());

        throw new DevExpress.XtraReports.Web.ClientControls.FaultException($"Report '{url}' was not found.");
    }

    public override Dictionary<string, string> GetUrls()
    {
        var urls = ReportsFactory.Reports.Keys
            .Concat(Reports.Keys)
            .Distinct(StringComparer.OrdinalIgnoreCase)
            .ToDictionary(name => name, name => name, StringComparer.OrdinalIgnoreCase);

        return urls;
    }

    public override bool IsValidUrl(string url)
    {
        return !string.IsNullOrWhiteSpace(url)
            && url.IndexOfAny(Path.GetInvalidFileNameChars()) < 0;
    }

    public override void SetData(XtraReport report, string url)
    {
        url = NormalizeUrl(url);
        Reports[url] = SaveReport(report);
    }

    public override string SetNewData(XtraReport report, string defaultUrl)
    {
        var url = NormalizeUrl(defaultUrl);
        Reports[url] = SaveReport(report);
        return url;
    }

    public bool TryGetReport(string url, out XtraReport report)
    {
        url = NormalizeUrl(url);

        if (!Reports.ContainsKey(url))
        {
            report = null!;
            return false;
        }

        using var stream = new MemoryStream(Reports[url]);
        report = XtraReport.FromXmlStream(stream, true);
        report.Name = url;
        return true;
    }

    private static string NormalizeUrl(string url)
    {
        return string.IsNullOrWhiteSpace(url) ? DefaultReportName : url;
    }

    private static byte[] SaveReport(XtraReport report)
    {
        using var stream = new MemoryStream();
        report.SaveLayoutToXml(stream);
        return stream.ToArray();
    }
}