using System.Globalization;
using Duempelkas.App.Services.Models;
using Microsoft.AspNetCore.Components;
using Microsoft.JSInterop;

namespace Duempelkas.App.Pages;

public partial class Dashboard
{
    #region Fields

    private List<AccountSummaryDto>? accounts;
    private bool showAddAccount;
    private bool showEditClubName;
    private bool showRestoreConfirm;
    private bool showYearFilterDialog;
    private int? selectedYear { get => Period.Year; set => Period.Year = value; }
    private List<int> availableYears = [];
    private string clubName = string.Empty;
    private string? savedPdfPath;
    private FileOperationResult? fileResult;
    private bool fileBusy;
    private string currentTheme = "light";

    #endregion

    #region Properties

    private string DisplayClubName => string.IsNullOrWhiteSpace(clubName) ? "Mein Verein" : clubName;

    private decimal TotalClubBalance => accounts?.Sum(a => a.TotalBalance) ?? 0m;

    #endregion

    #region Lifecycle

    protected override async Task OnInitializedAsync()
    {
        await LoadClubName();
        await LoadAll();
    }

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (!firstRender)
        {
            return;
        }

        try
        {
            currentTheme = await JS.InvokeAsync<string>("duempelkasThemeGetCurrentTheme");
        }
        catch (JSException)
        {
            // Keep default light mode when JS interop is not ready or unavailable.
            currentTheme = "light";
        }

        StateHasChanged();
    }

    #endregion

    #region Data Loading

    private async Task LoadAll()
    {
        await LoadAccounts();
        availableYears = Period.Choices(await EntryService.GetAllEntryYearsAsync());
    }

    private async Task LoadAccounts()
    {
        accounts = await AccountService.GetAllAccountsAsync(selectedYear);
    }

    private async Task LoadClubName()
    {
        clubName = await SettingsService.GetClubNameAsync() ?? string.Empty;
    }

    #endregion

    #region Actions

    private async Task HandleAccountCreated(AccountSetup setup)
    {
        await AccountService.CreateAccountAsync(setup.Name, setup.InitialBalance);
        showAddAccount = false;
        await LoadAll();
    }

    private async Task HandleSaveClubName(string newName)
    {
        await SettingsService.SetClubNameAsync(newName);
        showEditClubName = false;
        await LoadClubName();
    }

    private async Task HandleBackupAsync()
    {
        if (fileBusy) return;
        var busyToast = Toasts.Show("Dateiaktion läuft … Bitte warten.", persistent: true);
        fileBusy = true;
        fileResult = null;
        try
        {
            fileResult = await BackupService.CreateBackupAsync();

        }
        catch (Exception ex) { fileResult = FileOperationResult.Error(ex); }
        finally { fileBusy = false; Toasts.Dismiss(busyToast); }
    }

    private Task HandleRestoreAsync()
    {
        showRestoreConfirm = true;
        return Task.CompletedTask;
    }

    private void CancelRestoreConfirm()
    {
        showRestoreConfirm = false;
    }

    private async Task HandleConfirmRestore()
    {
        if (fileBusy) return;
        var busyToast = Toasts.Show("Dateiaktion läuft … Bitte warten.", persistent: true);
        fileBusy = true;
        fileResult = null;
        try
        {
            showRestoreConfirm = false;
            fileResult = await BackupService.RestoreBackupAsync();
            if (fileResult.Status == FileOperationStatus.Success) await LoadAll();

        }
        catch (Exception ex) { fileResult = FileOperationResult.Error(ex); }
        finally { fileBusy = false; Toasts.Dismiss(busyToast); }
    }

    private async Task HandleDashboardExportAsync()
    {
        if (fileBusy) return;
        var busyToast = Toasts.Show("Dateiaktion läuft … Bitte warten.", persistent: true);
        fileBusy = true;
        fileResult = null;
        try
        {
        var pdf = await PdfStatementService.GenerateDashboardStatementAsync(selectedYear);
        var suffix = selectedYear.HasValue ? $"_{selectedYear.Value}" : "_Gesamt";
        fileResult = await FileSaveService.SaveFileAsync(pdf, $"{DisplayClubName}_Übersicht{suffix}.pdf");

            savedPdfPath = fileResult.Status == FileOperationStatus.Success ? fileResult.Path : null;

        }
        catch (Exception ex) { fileResult = FileOperationResult.Error(ex); }
        finally { fileBusy = false; Toasts.Dismiss(busyToast); }
    }

    private void OpenYearFilterDialog()
    {
        showYearFilterDialog = true;
    }

    private void CloseYearFilterDialog()
    {
        showYearFilterDialog = false;
    }

    private async Task SelectFilterYear(int? year)
    {
        selectedYear = year;
        showYearFilterDialog = false;
        await LoadAll();
    }

    private async Task HandleOpenSavedPdf()
    {
        if (fileBusy) return;
        var busyToast = Toasts.Show("Dateiaktion läuft … Bitte warten.", persistent: true);
        fileBusy = true;
        fileResult = null;
        try
        {
        if (!string.IsNullOrWhiteSpace(savedPdfPath))
        {
            fileResult = await FileSaveService.OpenFileAsync(savedPdfPath);
        }

        savedPdfPath = null;

        }
        catch (Exception ex) { fileResult = FileOperationResult.Error(ex); }
        finally { fileBusy = false; Toasts.Dismiss(busyToast); }
    }

    private void CancelOpenSavedPdf()
    {
        savedPdfPath = null;
    }

    #endregion

    #region Helpers

    private static string FormatCurrency(decimal amount)
    {
        return amount.ToString("N2", CultureInfo.GetCultureInfo("de-DE")) + " €";
    }

    private string GetFilterLabel() => Period.Label;

    private string ThemeButtonLabel => currentTheme == "dark" ? "Hell" : "Dunkel";

    private string ThemeButtonIconClass => currentTheme == "dark" ? "bi bi-sun" : "bi bi-moon-stars";

    private async Task ToggleThemeAsync()
    {
        try
        {
            currentTheme = await JS.InvokeAsync<string>("duempelkasThemeToggleTheme");
        }
        catch (JSException)
        {
            currentTheme = currentTheme == "dark" ? "light" : "dark";
        }
    }

    [Inject]
    private IJSRuntime JS { get; set; } = default!;

    #endregion
}