using System;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;

namespace FastReport.Web.Blazor.Components
{
    public partial class ReportContainer
    {
        private void ChangedPageWithoutArgs()
        {
            OnUpdate();
        }


        private void ChangedPage(int page)
        {
            WebReport.GotoPage(page);
            ChangedPageWithoutArgs();
        }


        private void Prepare()
        {
            WebReport webReport = WebReport;
#if DIALOGS
            webReport.Dialog.CheckDialogs();
#endif

            if (!webReport.Canceled)
            {
                if (webReport.Mode != WebReportMode.Dialog)
                {
                    if (!webReport.ReportPrepared)
                    {
                        webReport.Report.Prepare();

                        webReport.SplitReportPagesByTabs();
                    }
                }
                else
                    webReport.Report.PreparePhase1();
            }
        }


#if WASM    // in wasm we need to prepare report in not main thread
        protected override async Task OnParametersSetAsync()
        {
            Debug.WriteLine($"threadId ReportContainer: {Environment.CurrentManagedThreadId}");

            await PrepareAsync();
            //await Task.Run(Prepare);

            WebReport.Container = this;
        }

        private async Task PrepareAsync(CancellationToken token = default)
        {
            Debug.WriteLine($"threadId ReportContainer: {Environment.CurrentManagedThreadId}");

            WebReport webReport = WebReport;
#if DIALOGS
            webReport.Dialog.CheckDialogs();
#endif

            if (!webReport.Canceled)
            {
                if (webReport.Mode != WebReportMode.Dialog)
                {
                    if (!webReport.ReportPrepared)
                    {
                        await webReport.Report.PrepareAsync(token);

                        webReport.SplitReportPagesByTabs();
                    }
                }
                else
                    webReport.Report.PreparePhase1();
            }
        }
#else
        protected override void OnParametersSet()
        {
            Prepare();

            WebReport.Container = this;
        }
#endif

        /// <summary>
        /// Update ReportContainer
        /// </summary>
        internal void OnUpdate(bool needPrepare = false)
        {
            if (needPrepare)
                Prepare();
            StateHasChanged();
        }
    }
}