using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Threading.Tasks;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using MoreLinq;
using MoreLinq.Extensions;
using Wino.Core.Domain;
using Wino.Core.Domain.Entities.Mail;
using Wino.Core.Domain.Entities.Shared;
using Wino.Core.Domain.Interfaces;
using Wino.Core.Domain.Models.Navigation;

namespace Wino.Mail.ViewModels;

public partial class SignatureManagementPageViewModel(IMailDialogService dialogService,
                                        ISignatureService signatureService,
                                        IAccountService accountService) : MailBaseViewModel
{
    public ObservableCollection<AccountSignature> Signatures { get; set; } = [];

    [ObservableProperty]
    private bool isSignatureEnabled;

    private int signatureForNewMessagesIndex;

    public Guid EmptyGuid { get; } = Guid.Empty;

    public int SignatureForNewMessagesIndex
    {
        get => signatureForNewMessagesIndex;
        set
        {
            if (value == -1)
            {
                SetProperty(ref signatureForNewMessagesIndex, 0);
            }
            else
            {
                SetProperty(ref signatureForNewMessagesIndex, value);
            }
        }
    }

    private int signatureForFollowingMessagesIndex;

    public int SignatureForFollowingMessagesIndex
    {
        get => signatureForFollowingMessagesIndex;
        set
        {
            if (value == -1)
            {
                SetProperty(ref signatureForFollowingMessagesIndex, 0);
            }
            else
            {
                SetProperty(ref signatureForFollowingMessagesIndex, value);
            }
        }
    }

    private MailAccount Account { get; set; }

    private readonly IMailDialogService _dialogService = dialogService;
    private readonly ISignatureService _signatureService = signatureService;
    private readonly IAccountService _accountService = accountService;

    public override async void OnNavigatedTo(NavigationMode mode, object parameters)
    {
        base.OnNavigatedTo(mode, parameters);

        if (parameters is Guid accountId)
            Account = await _accountService.GetAccountAsync(accountId);

        if (Account == null) return;

        var dbSignatures = await _signatureService.GetSignaturesAsync(Account.Id);
        IsSignatureEnabled = Account.Preferences.IsSignatureEnabled;

        Signatures.Clear();
        Signatures.Add(new AccountSignature { Id = EmptyGuid, Name = Translator.SettingsSignature_NoneSignatureName });
        dbSignatures.ForEach(Signatures.Add);

        SignatureForNewMessagesIndex = Signatures.IndexOf(Signatures.FirstOrDefault(x => x.Id == Account.Preferences.SignatureIdForNewMessages));
        SignatureForFollowingMessagesIndex = Signatures.IndexOf(Signatures.FirstOrDefault(x => x.Id == Account.Preferences.SignatureIdForFollowingMessages));
    }

    protected override async void OnPropertyChanged(PropertyChangedEventArgs e)
    {
        base.OnPropertyChanged(e);

        switch (e.PropertyName)
        {
            case nameof(IsSignatureEnabled):
                Account.Preferences.IsSignatureEnabled = IsSignatureEnabled;
                await _accountService.UpdateAccountAsync(Account);
                break;
            case nameof(SignatureForNewMessagesIndex):
                Account.Preferences.SignatureIdForNewMessages = SignatureForNewMessagesIndex > -1
                    && Signatures[SignatureForNewMessagesIndex].Id != EmptyGuid
                    ? Signatures[SignatureForNewMessagesIndex].Id : null;
                await _accountService.UpdateAccountAsync(Account);
                break;
            case nameof(SignatureForFollowingMessagesIndex):
                Account.Preferences.SignatureIdForFollowingMessages = SignatureForFollowingMessagesIndex > -1
                    && Signatures[SignatureForFollowingMessagesIndex].Id != EmptyGuid
                    ? Signatures[SignatureForFollowingMessagesIndex].Id : null;
                await _accountService.UpdateAccountAsync(Account);
                break;
        }
    }

    [RelayCommand]
    private async Task OpenSignatureEditorCreateAsync()
    {
        var dialogResult = await _dialogService.ShowSignatureEditorDialog();

        if (dialogResult == null) return;

        dialogResult.MailAccountId = Account.Id;
        Signatures.Add(dialogResult);
        await _signatureService.CreateSignatureAsync(dialogResult);
    }

    [RelayCommand]
    private async Task OpenSignatureEditorEditAsync(AccountSignature signatureModel)
    {
        var dialogResult = await _dialogService.ShowSignatureEditorDialog(signatureModel);

        if (dialogResult == null) return;

        var indexOfCurrentSignature = Signatures.IndexOf(signatureModel);
        var signatureNewMessagesIndex = SignatureForNewMessagesIndex;
        var signatureFollowingMessagesIndex = SignatureForFollowingMessagesIndex;

        Signatures[indexOfCurrentSignature] = dialogResult;

        // Reset selection to point updated signature.
        // When Item updated/removed index switches to -1. We save index that was used before and update -1 to it.
        if (signatureNewMessagesIndex == indexOfCurrentSignature)
            SignatureForNewMessagesIndex = indexOfCurrentSignature;

        if (signatureFollowingMessagesIndex == indexOfCurrentSignature)
            SignatureForFollowingMessagesIndex = indexOfCurrentSignature;

        await _signatureService.UpdateSignatureAsync(dialogResult);
    }

    [RelayCommand]
    private async Task DeleteSignatureAsync(AccountSignature signatureModel)
    {
        var shouldRemove = await _dialogService.ShowConfirmationDialogAsync(string.Format(Translator.SignatureDeleteDialog_Message, signatureModel.Name), Translator.SignatureDeleteDialog_Title, Translator.Buttons_Delete);

        if (!shouldRemove) return;

        Signatures.Remove(signatureModel);
        await _signatureService.DeleteSignatureAsync(signatureModel);
    }
}