using Duempelkas.App.Services.Models;
using Microsoft.AspNetCore.Components;

namespace Duempelkas.App.Components.Dialogs;

public partial class AddTransferDialog
{
    #region Parameters

    [Parameter]
    public int SourceAccountId { get; set; }

    [Parameter]
    public EntryDto? EditEntry { get; set; }

    [Parameter]
    public EventCallback<BookingSaved> OnSave { get; set; }

    [Parameter]
    public EventCallback OnCancel { get; set; }

    #endregion

    [Parameter] public int? ContextYear { get; set; }
    private bool confirmDifferentYear;
    private int? confirmedYear;
    private bool OutsideYear => ContextYear.HasValue && date.Year != ContextYear.Value;

    private bool isSaving;
    private bool completed;
    private BookingSaved? committedResult;
    private string? saveError;
    private string? saveDetails;

    #region Fields

    private List<AccountSummaryDto> accounts = new();
    private int targetAccountId;
    private string dateText = DateTime.Today.ToString("yyyy-MM-dd");
    private DateTime date => Duempelkas.App.Services.BookingInput.Date(dateText);
    private string title = string.Empty;
    private string amountText = string.Empty;
    private bool ValidAmount => Duempelkas.App.Services.BookingInput.TryAmount(amountText, out _);
    private decimal amount => Duempelkas.App.Services.BookingInput.TryAmount(amountText, out var value) ? value : 0;
    private string initialState = string.Empty;
    private string CurrentState => $"{dateText}|{title}|{amountText}|{targetAccountId}";
    private bool IsDirty => CurrentState != initialState;
    private bool initialized;
    private int? initializedEntryId;

    #endregion

    #region Properties

    private bool IsIncoming => EditEntry?.Type == Duempelkas.Domain.Enums.EntryType.Income;
    private string CurrentAccountName => accounts.FirstOrDefault(a => a.Id == SourceAccountId)?.Name ?? "Aktuelles Konto";
    private string LinkedAccountName => accounts.FirstOrDefault(a => a.Id == targetAccountId)?.Name ?? "Konto auswählen";
    private string FromName => IsIncoming ? LinkedAccountName : CurrentAccountName;
    private string ToName => IsIncoming ? CurrentAccountName : LinkedAccountName;
    private static string Money(decimal value) => value.ToString("N2", System.Globalization.CultureInfo.GetCultureInfo("de-DE")) + " €";

    private bool CanSave => targetAccountId > 0 && targetAccountId != SourceAccountId && !string.IsNullOrWhiteSpace(title) && ValidAmount && date != default && (!OutsideYear || (confirmDifferentYear && confirmedYear == date.Year));

    #endregion

    #region Lifecycle

    protected override async Task OnParametersSetAsync()
    {
        if (!accounts.Any())
        {
            accounts = await AccountService.GetAllAccountsAsync();
        }

        if (initialized && initializedEntryId == EditEntry?.Id) return;
        initialized = true;
        initializedEntryId = EditEntry?.Id;
        if (EditEntry != null)
        {
            targetAccountId = EditEntry.LinkedAccountId ?? 0;
            dateText = EditEntry.Date.ToString("yyyy-MM-dd");
            title = EditEntry.Title;
            amountText = EditEntry.Amount.ToString("0.00", System.Globalization.CultureInfo.GetCultureInfo("de-DE"));
        }
        initialState = CurrentState;
    }

    #endregion

    #region Actions

    private async Task Save()
    {
        if (isSaving || completed) return;
        if (committedResult == null && bookingDate != null) await bookingDate.CommitAsync();
        if (isSaving || completed || (committedResult == null && !CanSave)) return;
        var busyToast = Toasts.Show("Wird gespeichert …", persistent: true);
        isSaving = true;
        saveError = null;
        saveDetails = null;
        try
        {
            if (committedResult == null)
            {
                var id = EditEntry?.Id ?? 0;
                if (EditEntry != null)
                    await EntryService.UpdateTransferAsync(EditEntry.Id, targetAccountId, date, title.Trim(), amount);
                else
                    id = await EntryService.CreateTransferAsync(SourceAccountId, targetAccountId, date, title.Trim(), amount);
                committedResult = new(id, date, "Umbuchung", amount, EditEntry != null);
            }
            // If refreshing the page fails after commit, retry only notification,
            // never create a second booking.
            await OnSave.InvokeAsync(committedResult);
            completed = true;
        }
        catch (Exception ex)
        {
            saveError = committedResult == null
                ? "Speichern fehlgeschlagen. Die Eingaben bleiben erhalten. Bitte erneut versuchen."
                : "Die Buchung ist gespeichert. Die Ansicht konnte nicht aktualisiert werden. Bitte Ansicht aktualisieren; es wird keine weitere Buchung erzeugt.";
            saveDetails = ex.Message;
            Toasts.Show(saveError, Duempelkas.App.Services.ToastKind.Error, saveDetails);
        }
        finally { isSaving = false; Toasts.Dismiss(busyToast); }
    }

    private async Task Cancel()
    {
        if (!isSaving && modal != null) await modal.RequestCloseAsync();
    }

    #endregion
}