using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using CommunityToolkit.Mvvm.Messaging;
using Wino.Core.Domain;
using Wino.Core.Domain.Enums;
using Wino.Core.Domain.Interfaces;
using Wino.Core.Domain.Models.Accounts;
using Wino.Core.Domain.Models.Navigation;
using Wino.Core.ViewModels.Data;
using Wino.Mail.ViewModels.Data;
using Wino.Messaging.Client.Navigation;

namespace Wino.Mail.ViewModels;

public partial class ProviderSelectionPageViewModel : MailBaseViewModel
{
    private readonly IAccountService _accountService;
    private readonly IDialogServiceBase _dialogService;
    private readonly IProviderService _providerService;
    private readonly INewThemeService _themeService;

    public WelcomeWizardContext WizardContext { get; }

    public List<IProviderDetail> Providers { get; private set; } = [];
    public List<AppColorViewModel> AvailableColors { get; private set; } = [];
    public List<InitialSynchronizationRangeOption> InitialSynchronizationRanges { get; } =
    [
        new(InitialSynchronizationRange.ThreeMonths, Translator.AccountCreation_InitialSynchronization_3Months),
        new(InitialSynchronizationRange.SixMonths, Translator.AccountCreation_InitialSynchronization_6Months),
        new(InitialSynchronizationRange.NineMonths, Translator.AccountCreation_InitialSynchronization_9Months),
        new(InitialSynchronizationRange.OneYear, Translator.AccountCreation_InitialSynchronization_Year),
        new(InitialSynchronizationRange.Everything, Translator.AccountCreation_InitialSynchronization_Everything)
    ];

    [ObservableProperty]
    public partial IProviderDetail SelectedProvider { get; set; }

    [ObservableProperty]
    [NotifyPropertyChangedFor(nameof(IsColorSelected))]
    public partial AppColorViewModel SelectedColor { get; set; }

    [ObservableProperty]
    [NotifyPropertyChangedFor(nameof(IsInitialSynchronizationWarningVisible))]
    public partial InitialSynchronizationRangeOption SelectedInitialSynchronizationRange { get; set; }

    [ObservableProperty]
    public partial string AccountName { get; set; }

    [ObservableProperty]
    public partial bool CanProceed { get; set; }

    public bool IsColorSelected => SelectedColor != null;
    public bool IsInitialSynchronizationWarningVisible => SelectedInitialSynchronizationRange?.IsEverything == true;

    public ProviderSelectionPageViewModel(
        IAccountService accountService,
        IDialogServiceBase dialogService,
        IProviderService providerService,
        INewThemeService themeService,
        WelcomeWizardContext wizardContext)
    {
        _accountService = accountService;
        _dialogService = dialogService;
        _providerService = providerService;
        _themeService = themeService;
        WizardContext = wizardContext;
        SelectedInitialSynchronizationRange = InitialSynchronizationRanges.First(option => option.Range == InitialSynchronizationRange.SixMonths);
    }

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

        Providers = _providerService.GetAvailableProviders();
        AvailableColors = _themeService.GetAvailableAccountColors()
            .Select(hex => new AppColorViewModel(hex))
            .ToList();

        SelectedInitialSynchronizationRange = InitialSynchronizationRanges
            .FirstOrDefault(option => option.Range == WizardContext.SelectedInitialSynchronizationRange)
            ?? InitialSynchronizationRanges.First(option => option.Range == InitialSynchronizationRange.SixMonths);

        // Restore from wizard context if navigating back
        if (WizardContext.SelectedProvider != null)
        {
            SelectedProvider = Providers.FirstOrDefault(p =>
                p.Type == WizardContext.SelectedProvider.Type &&
                p.SpecialImapProvider == WizardContext.SelectedProvider.SpecialImapProvider);
            AccountName = WizardContext.AccountName;

            if (WizardContext.AccountColorHex != null)
                SelectedColor = AvailableColors.FirstOrDefault(c => c.Hex == WizardContext.AccountColorHex);
        }

        Validate();
    }

    partial void OnSelectedProviderChanged(IProviderDetail value)
    {
        Validate();
    }

    partial void OnAccountNameChanged(string value) => Validate();

    [RelayCommand]
    private void ClearColor() => SelectedColor = null;

    private void Validate()
    {
        CanProceed = SelectedProvider != null && !string.IsNullOrWhiteSpace(AccountName);
    }

    [RelayCommand]
    private async Task ProceedAsync()
    {
        if (!CanProceed) return;

        if (await _accountService.AccountNameExistsAsync(AccountName))
        {
            await _dialogService.ShowMessageAsync(
                Translator.DialogMessage_AccountNameExistsMessage,
                Translator.DialogMessage_AccountExistsTitle,
                WinoCustomMessageDialogIcon.Warning);
            return;
        }

        // Persist to wizard context
        WizardContext.SelectedProvider = SelectedProvider;
        WizardContext.AccountName = AccountName?.Trim();
        WizardContext.AccountColorHex = SelectedColor?.Hex ?? string.Empty;
        WizardContext.SelectedInitialSynchronizationRange = SelectedInitialSynchronizationRange?.Range ?? InitialSynchronizationRange.SixMonths;

        if (WizardContext.IsGenericImap)
        {
            // Navigate to ImapCalDavSettingsPage in wizard mode
            var context = ImapCalDavSettingsNavigationContext.CreateForWizardMode(
                WizardContext.BuildAccountCreationDialogResult());

            Messenger.Send(new BreadcrumbNavigationRequested(
                Translator.ImapCalDavSettingsPage_TitleCreate,
                WinoPage.ImapCalDavSettingsPage,
                context));
        }
        else if (SelectedProvider.SpecialImapProvider is SpecialImapProvider.iCloud or SpecialImapProvider.Yahoo)
        {
            // Navigate to credentials page for special IMAP providers
            Messenger.Send(new BreadcrumbNavigationRequested(
                SelectedProvider.Name,
                WinoPage.SpecialImapCredentialsPage));
        }
        else
        {
            // OAuth — go directly to progress page
            Messenger.Send(new BreadcrumbNavigationRequested(
                Translator.WelcomeWizard_Step3Title,
                WinoPage.AccountSetupProgressPage));
        }
    }
}