using System.Text.Json;
using Omika.App.Local.Models;
using Omika.App.Local.Services;
using Omika.App.Navigation;
using Omika.App.ViewModels;
using Omika.Core.Contracts.Clients;
using Omika.Core.Contracts.Common;
using Omika.Core.Contracts.Interventions;
using Omika.Core.Contracts.Sites;

namespace Omika.Tests.Mobile.Local;

/// <summary>
/// Tests du ViewModel du détail d'un dossier : chargement, état introuvable,
/// données affichées, interventions liées et navigation vers une intervention.
/// </summary>
public class DossierDetailViewModelTests : LocalTestBase
{
    private readonly DossierDetailViewModel _viewModel;
    private readonly NavigationService _navigation;

    public DossierDetailViewModelTests()
    {
        var service = new DossierLocalService(DossierRepository, ClientRepository, DossierStateRepository, DossierInterventionCacheRepository, ApiClient);
        var clientService = new ClientLocalService(ClientRepository, DossierRepository, ContextInterventionCacheRepository, ClientStateRepository, ApiClient);
        _navigation = new NavigationService();
        _viewModel = new DossierDetailViewModel(service, clientService, _navigation);
    }

    private static LocalDossier CreateDossier(Guid id, string reference, string titre, Guid? clientId = null, Guid? siteId = null)
    {
        var dto = new DossierDetailsDto
        {
            Id = id.ToString(),
            ReferenceMetier = reference,
            Titre = titre,
            ClientId = clientId?.ToString(),
            SiteId = siteId?.ToString(),
            Statut = new ReferenceValueDto { Label = "Ouvert" }
        };
        return new LocalDossier
        {
            Id = id,
            ClientId = clientId,
            SiteId = siteId,
            PayloadJson = JsonSerializer.Serialize(dto),
            UpdatedAtUtc = DateTimeOffset.UtcNow
        };
    }

    private static LocalSite CreateSite(Guid id, string nom)
    {
        var dto = new SiteDetailsDto { Id = id.ToString(), Nom = nom };
        return new LocalSite
        {
            Id = id,
            PayloadJson = JsonSerializer.Serialize(dto),
            UpdatedAtUtc = DateTimeOffset.UtcNow
        };
    }

    private static LocalClient CreateClient(Guid id, string nom)
    {
        var dto = new ClientDetailsDto
        {
            Id = id.ToString(),
            Nom = nom
        };
        return new LocalClient
        {
            Id = id,
            PayloadJson = JsonSerializer.Serialize(dto),
            UpdatedAtUtc = DateTimeOffset.UtcNow
        };
    }

    private static LocalIntervention CreateIntervention(Guid id, Guid dossierId, string reference, string titre)
    {
        var dto = new InterventionDetailsDto
        {
            Id = id.ToString(),
            Reference = reference,
            Titre = titre,
            DossierId = dossierId.ToString()
        };
        return new LocalIntervention
        {
            Id = id,
            DossierId = dossierId,
            PayloadJson = JsonSerializer.Serialize(dto),
            UpdatedAtUtc = DateTimeOffset.UtcNow
        };
    }

    [Fact]
    public async Task Load_ChargementPuisDetail()
    {
        // Arrange
        Guid dossierId = Guid.NewGuid();
        await DossierRepository.UpsertAsync(CreateDossier(dossierId, "DOS-001", "Dossier A"));

        // Act
        await _viewModel.LoadCommand.ExecuteAsync(dossierId);

        // Assert : après chargement, détail affiché et chargement terminé.
        Assert.False(_viewModel.IsLoading);
        Assert.NotNull(_viewModel.Dossier);
        Assert.Equal("DOS-001", _viewModel.Dossier.Reference);

    }

    [Fact]
    public async Task Load_DossierIntrouvable_MessageErreur()
    {
        // Act
        await _viewModel.LoadCommand.ExecuteAsync(Guid.NewGuid());

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

    [Fact]
    public async Task Load_DonneesAffichees()
    {
        // Arrange
        Guid dossierId = Guid.NewGuid();
        await DossierRepository.UpsertAsync(CreateDossier(dossierId, "DOS-001", "Dossier A"));

        // Act
        await _viewModel.LoadCommand.ExecuteAsync(dossierId);

        // Assert
        Assert.NotNull(_viewModel.Dossier);
        Assert.Equal("DOS-001", _viewModel.Dossier.Reference);
        Assert.Equal("Dossier A", _viewModel.Dossier.Titre);
        Assert.Equal("Ouvert", _viewModel.Dossier.Statut);
    }

    [Fact]
    public async Task Load_InterventionsLiees()
    {
        // Arrange : cache contextuel (pas la table historique Intervention).
        Guid dossierId = Guid.NewGuid();
        Guid interventionId = Guid.NewGuid();
        await DossierRepository.UpsertAsync(CreateDossier(dossierId, "DOS-001", "A"));
        await DossierInterventionCacheRepository.ReplaceAsync(
            dossierId,
            [new InterventionDetailsDto { Id = interventionId.ToString(), Reference = "INT-001", Titre = "Intervention" }]);

        // Act
        await _viewModel.LoadCommand.ExecuteAsync(dossierId);

        // Assert
        Assert.True(_viewModel.HasInterventions);
        var intervention = Assert.Single(_viewModel.Interventions);
        Assert.Equal(interventionId, intervention.InterventionGuid);
    }

    [Fact]
    public async Task OpenIntervention_NavigueVersDetail()
    {
        // Arrange : cache contextuel.
        Guid dossierId = Guid.NewGuid();
        Guid interventionId = Guid.NewGuid();
        await DossierRepository.UpsertAsync(CreateDossier(dossierId, "DOS-001", "A"));
        await DossierInterventionCacheRepository.ReplaceAsync(
            dossierId,
            [new InterventionDetailsDto { Id = interventionId.ToString(), Reference = "INT-001", Titre = "Intervention" }]);
        await _viewModel.LoadCommand.ExecuteAsync(dossierId);

        // Act
        _viewModel.OpenInterventionCommand.Execute(_viewModel.Interventions[0]);

        // Assert : navigation vers le détail de l'intervention avec le GUID public et le retour vers la fiche Dossier.
        Assert.Equal(AppPage.InterventionDetail, _navigation.CurrentPage);
        var nav = Assert.IsType<DetailNavigation>(_navigation.CurrentParameter);
        Assert.Equal(interventionId, nav.Id);
        Assert.Equal(AppPage.DossierDetail, nav.ReturnContext.Page);
        Assert.Equal(dossierId, nav.ReturnContext.Parameter);
    }

    [Fact]
    public async Task OpenIntervention_Null_NeNaviguePas()

    {
        // Act
        _viewModel.OpenInterventionCommand.Execute(null);

        // Assert
        Assert.Equal(AppPage.Home, _navigation.CurrentPage);
    }

    [Fact]
    public async Task Back_RetourneALaListe()
    {
        // Act
        _viewModel.BackCommand.Execute(null);

        // Assert
        Assert.Equal(AppPage.Dossiers, _navigation.CurrentPage);
    }

    [Fact]
    public async Task Load_SansIntervention_EtatVide()
    {
        // Arrange
        Guid dossierId = Guid.NewGuid();
        await DossierRepository.UpsertAsync(CreateDossier(dossierId, "DOS-001", "A"));

        // Act
        await _viewModel.LoadCommand.ExecuteAsync(dossierId);

        // Assert : dossier valide sans intervention.
        Assert.NotNull(_viewModel.Dossier);
        Assert.False(_viewModel.HasInterventions);
        Assert.Empty(_viewModel.Interventions);
    }

    [Fact]
    public async Task Load_AvecClient_HasClientVrai()
    {
        // Arrange
        Guid clientId = Guid.NewGuid();
        Guid dossierId = Guid.NewGuid();
        await ClientRepository.UpsertAsync(CreateClient(clientId, "Client Alpha"));
        await DossierRepository.UpsertAsync(CreateDossier(dossierId, "DOS-001", "A", clientId));

        // Act
        await _viewModel.LoadCommand.ExecuteAsync(dossierId);

        // Assert
        Assert.True(_viewModel.HasClient);
        Assert.Equal("Client Alpha", _viewModel.Dossier!.ClientNom);
    }

    [Fact]
    public async Task Load_SansClient_HasClientFaux()
    {
        // Arrange
        Guid dossierId = Guid.NewGuid();
        await DossierRepository.UpsertAsync(CreateDossier(dossierId, "DOS-001", "A"));

        // Act
        await _viewModel.LoadCommand.ExecuteAsync(dossierId);

        // Assert
        Assert.False(_viewModel.HasClient);
        Assert.Null(_viewModel.Dossier!.ClientGuid);
    }

    [Fact]
    public async Task Load_NeReintroduitPasSite()
    {
        // La règle métier du lot 37B : le détail Dossier n'expose pas de Site.
        Guid dossierId = Guid.NewGuid();
        await DossierRepository.UpsertAsync(CreateDossier(dossierId, "DOS-001", "A"));

        await _viewModel.LoadCommand.ExecuteAsync(dossierId);

        Assert.NotNull(_viewModel.Dossier);
        Assert.Null(_viewModel.Dossier!.SiteNom);
    }
}