using Omika.App.Local.Abstractions;
using Omika.App.Local.Models;
using Omika.App.Navigation;
using Omika.App.ViewModels;

namespace Omika.Tests.Mobile.Local;

/// <summary>
/// Tests du ViewModel Détail Contact (lecture seule) : chargement local,
/// coordonnées disponibles, actions téléphone / email via des fakes plateforme
/// et retour vers la liste des contacts de l'intervention.
/// </summary>
public class ContactDetailViewModelTests
{
    private sealed class FakeContactsService : IInterventionContactsService
    {
        public InterventionContact? ContactToReturn { get; set; }
        public bool ThrowOnLoad { get; set; }

        public Task<IReadOnlyList<InterventionContact>> GetContactsForInterventionAsync(
            Guid interventionGuid, CancellationToken ct = default)
            => Task.FromResult<IReadOnlyList<InterventionContact>>([]);

        public Task<InterventionContact?> GetContactByIdAsync(Guid contactGuid, CancellationToken ct = default)
        {
            if (ThrowOnLoad)
            {
                throw new InvalidOperationException("Erreur de chargement");
            }
            return Task.FromResult(ContactToReturn);
        }

        public Task<IReadOnlyList<InterventionContact>> GetContactsDisponiblesAsync(Guid interventionGuid, CancellationToken ct = default)
            => Task.FromResult<IReadOnlyList<InterventionContact>>([]);
    }

    private sealed class FakePhoneLauncher : IPhoneLauncher
    {
        public int DialCalls { get; private set; }
        public string? LastNumber { get; private set; }
        public bool DialResult { get; set; } = true;

        public Task<bool> DialAsync(string phoneNumber)
        {
            DialCalls++;
            LastNumber = phoneNumber;
            return Task.FromResult(DialResult);
        }
    }

    private sealed class FakeEmailLauncher : IEmailLauncher
    {
        public int ComposeCalls { get; private set; }
        public string? LastEmail { get; private set; }
        public bool ComposeResult { get; set; } = true;

        public Task<bool> ComposeAsync(string email)
        {
            ComposeCalls++;
            LastEmail = email;
            return Task.FromResult(ComposeResult);
        }
    }

    private static InterventionContact CreateContact(
        Guid id,
        string? mobile = null,
        string? phone = null,
        string? email = null)
        => new()
        {
            ContactGuid = id,
            DisplayName = "Alice Dupont",
            Mobile = mobile,
            Phone = phone,
            Email = email
        };

    private readonly FakeContactsService _service = new();
    private readonly FakePhoneLauncher _phoneLauncher = new();
    private readonly FakeEmailLauncher _emailLauncher = new();
    private readonly NavigationService _navigation = new();
    private readonly ContactDetailViewModel _viewModel;

    public ContactDetailViewModelTests()
    {
        _viewModel = new ContactDetailViewModel(_service, _phoneLauncher, _emailLauncher, _navigation);
    }

    private static DetailNavigation Nav(Guid interventionId, Guid contactId)
        => new(contactId, new NavigationContext(AppPage.InterventionContacts, interventionId));


    [Fact]
    public async Task Load_ChargeLeContact()
    {
        // Arrange
        Guid interventionId = Guid.NewGuid();
        Guid contactId = Guid.NewGuid();
        _service.ContactToReturn = CreateContact(contactId, mobile: "0600000000", email: "alice@test.fr");

        // Act
        await _viewModel.LoadCommand.ExecuteAsync(Nav(interventionId, contactId));

        // Assert
        Assert.False(_viewModel.IsLoading);
        Assert.Null(_viewModel.ErrorMessage);
        Assert.NotNull(_viewModel.Contact);
        Assert.Equal(contactId, _viewModel.ContactGuid);
        Assert.True(_viewModel.HasPhone);
        Assert.True(_viewModel.HasEmail);

    }

    [Fact]
    public async Task Load_ContactIntrouvable_MessageErreur()
    {
        // Arrange
        _service.ContactToReturn = null;

        // Act
        await _viewModel.LoadCommand.ExecuteAsync(Nav(Guid.NewGuid(), Guid.NewGuid()));

        // Assert
        Assert.False(_viewModel.IsLoading);
        Assert.NotNull(_viewModel.ErrorMessage);
        Assert.Null(_viewModel.Contact);
    }

    [Fact]
    public async Task Load_Erreur_MessageAffiché()
    {
        // Arrange
        _service.ThrowOnLoad = true;

        // Act
        await _viewModel.LoadCommand.ExecuteAsync(Nav(Guid.NewGuid(), Guid.NewGuid()));

        // Assert
        Assert.False(_viewModel.IsLoading);
        Assert.NotNull(_viewModel.ErrorMessage);
    }

    [Fact]
    public async Task Call_NumeroDisponible_AppelleLeLauncher()
    {
        // Arrange
        Guid contactId = Guid.NewGuid();
        _service.ContactToReturn = CreateContact(contactId, mobile: "0600000000");
        await _viewModel.LoadCommand.ExecuteAsync(Nav(Guid.NewGuid(), contactId));

        // Act
        await _viewModel.CallCommand.ExecuteAsync(null);

        // Assert
        Assert.Equal(1, _phoneLauncher.DialCalls);
        Assert.Equal("0600000000", _phoneLauncher.LastNumber);
    }

    [Fact]
    public async Task Call_SansNumero_NeAppellePas()
    {
        // Arrange
        Guid contactId = Guid.NewGuid();
        _service.ContactToReturn = CreateContact(contactId, email: "alice@test.fr");
        await _viewModel.LoadCommand.ExecuteAsync(Nav(Guid.NewGuid(), contactId));

        // Act
        await _viewModel.CallCommand.ExecuteAsync(null);

        // Assert
        Assert.Equal(0, _phoneLauncher.DialCalls);
        Assert.False(_viewModel.HasPhone);
    }

    [Fact]
    public async Task Call_ContactNull_NeAppellePas()
    {
        // Act
        await _viewModel.CallCommand.ExecuteAsync(null);

        // Assert
        Assert.Equal(0, _phoneLauncher.DialCalls);
    }

    [Fact]
    public async Task Call_LauncherRetourneFalse_MessageErreur()
    {
        // Arrange
        Guid contactId = Guid.NewGuid();
        _service.ContactToReturn = CreateContact(contactId, mobile: "0600000000");
        await _viewModel.LoadCommand.ExecuteAsync(Nav(Guid.NewGuid(), contactId));
        _phoneLauncher.DialResult = false;

        // Act
        await _viewModel.CallCommand.ExecuteAsync(null);

        // Assert : le résultat false est remonté à l'utilisateur.
        Assert.Equal(1, _phoneLauncher.DialCalls);
        Assert.Equal("Aucune application téléphonique disponible.", _viewModel.ErrorMessage);
    }

    [Fact]
    public async Task Email_Disponible_AppelleLeLauncher()
    {
        // Arrange
        Guid contactId = Guid.NewGuid();
        _service.ContactToReturn = CreateContact(contactId, email: "alice@test.fr");
        await _viewModel.LoadCommand.ExecuteAsync(Nav(Guid.NewGuid(), contactId));

        // Act
        await _viewModel.EmailCommand.ExecuteAsync(null);

        // Assert
        Assert.Equal(1, _emailLauncher.ComposeCalls);
        Assert.Equal("alice@test.fr", _emailLauncher.LastEmail);
    }

    [Fact]
    public async Task Email_SansAdresse_NeAppellePas()
    {
        // Arrange
        Guid contactId = Guid.NewGuid();
        _service.ContactToReturn = CreateContact(contactId, mobile: "0600000000");
        await _viewModel.LoadCommand.ExecuteAsync(Nav(Guid.NewGuid(), contactId));

        // Act
        await _viewModel.EmailCommand.ExecuteAsync(null);

        // Assert
        Assert.Equal(0, _emailLauncher.ComposeCalls);
        Assert.False(_viewModel.HasEmail);
    }

    [Fact]
    public async Task Email_ContactNull_NeAppellePas()
    {
        // Act
        await _viewModel.EmailCommand.ExecuteAsync(null);

        // Assert
        Assert.Equal(0, _emailLauncher.ComposeCalls);
    }

    [Fact]
    public async Task Email_LauncherRetourneFalse_MessageErreur()
    {
        // Arrange
        Guid contactId = Guid.NewGuid();
        _service.ContactToReturn = CreateContact(contactId, email: "alice@test.fr");
        await _viewModel.LoadCommand.ExecuteAsync(Nav(Guid.NewGuid(), contactId));
        _emailLauncher.ComposeResult = false;

        // Act
        await _viewModel.EmailCommand.ExecuteAsync(null);

        // Assert : le résultat false est remonté à l'utilisateur.
        Assert.Equal(1, _emailLauncher.ComposeCalls);
        Assert.Equal("Aucune application de messagerie disponible.", _viewModel.ErrorMessage);
    }

    [Fact]
    public async Task Email_LauncherRetourneTrue_AucunMessage()
    {
        // Arrange
        Guid contactId = Guid.NewGuid();
        _service.ContactToReturn = CreateContact(contactId, email: "alice@test.fr");
        await _viewModel.LoadCommand.ExecuteAsync(Nav(Guid.NewGuid(), contactId));

        // Act
        await _viewModel.EmailCommand.ExecuteAsync(null);

        // Assert : succès → aucun message d'erreur.
        Assert.Equal(1, _emailLauncher.ComposeCalls);
        Assert.Null(_viewModel.ErrorMessage);
    }

    [Fact]
    public async Task Back_RetourneALaListeDesContacts()
    {
        // Arrange
        Guid interventionId = Guid.NewGuid();
        Guid contactId = Guid.NewGuid();
        _service.ContactToReturn = CreateContact(contactId);

        // Construit l'historique de navigation : InterventionContacts -> ContactDetail.
        _navigation.NavigateTo(AppPage.InterventionContacts, interventionId);
        _navigation.NavigateTo(AppPage.ContactDetail, Nav(interventionId, contactId));

        await _viewModel.LoadCommand.ExecuteAsync(Nav(interventionId, contactId));

        // Act
        _viewModel.BackCommand.Execute(null);

        // Assert : retour vers la page précédente (liste des contacts de l'intervention).
        Assert.Equal(AppPage.InterventionContacts, _navigation.CurrentPage);
        Assert.Equal(interventionId, _navigation.CurrentParameter);
    }
}