manager-service/ManagerService.Tests/Controllers/AiControllerTests.cs

using ManagerService.Controllers;
using ManagerService.Data;
using ManagerService.DTOs;
using ManagerService.Services;
using ManagerService.Tests.Infrastructure;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging.Abstractions;
using Hangfire;
using Moq;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Xunit;

namespace ManagerService.Tests.Controllers
{
    public class AiControllerTests
    {
        private static readonly AiChatResponse FakeResponse = new AiChatResponse { Reply = "OK", TokensUsed = 42 };

        // Chat vérifie les droits de l'appelant (IsSuperAdmin / instance du token) :
        // sans utilisateur, User est null et le contrôleur renvoie un 500.
        private AiController BuildController(MyInfoMateDbContext db, Mock<IAssistantService>? mockService = null,
            string callerRole = Permissions.SuperAdmin, string callerInstanceId = "i1")
        {
            mockService ??= new Mock<IAssistantService>();
            mockService
                .Setup(s => s.ChatAsync(It.IsAny<AiChatRequest>()))
                .ReturnsAsync(FakeResponse);

            var controller = new AiController(mockService.Object, db, NullLogger<AiController>.Instance,
                new Mock<IBackgroundJobClient>().Object);
            FakeUser.SetUser(controller, FakeUser.Create(callerRole, callerInstanceId));
            return controller;
        }

        private static AiChatRequest MakeRequest(string instanceId, AppType appType = AppType.Tablet) =>
            new AiChatRequest { InstanceId = instanceId, AppType = appType, Message = "Bonjour" };

        // ── FORBID CASES ─────────────────────────────────────────────────────

        [Fact]
        public async Task Chat_InstanceNotFound_ReturnsForbid()
        {
            using var db = DbContextFactory.Create();

            var result = await BuildController(db).Chat(MakeRequest("unknown"));

            Assert.IsType<ForbidResult>(result);
        }

        [Fact]
        public async Task Chat_InstanceAssistantDisabled_ReturnsForbid()
        {
            using var db = DbContextFactory.Create();
            db.Instances.Add(new Instance
            {
                Id = "i1", Name = "Musée", IsAssistant = false, DateCreation = DateTime.UtcNow
            });
            db.ApplicationInstances.Add(new ApplicationInstance
            {
                Id = "ai1", InstanceId = "i1", AppType = AppType.Tablet, IsAssistant = true,
                Languages = new List<string>()
            });
            db.SaveChanges();

            var result = await BuildController(db).Chat(MakeRequest("i1"));

            Assert.IsType<ForbidResult>(result);
        }

        [Fact]
        public async Task Chat_AppInstanceAssistantDisabled_ReturnsForbid()
        {
            using var db = DbContextFactory.Create();
            db.Instances.Add(new Instance
            {
                Id = "i1", Name = "Musée", IsAssistant = true, DateCreation = DateTime.UtcNow
            });
            db.ApplicationInstances.Add(new ApplicationInstance
            {
                Id = "ai1", InstanceId = "i1", AppType = AppType.Tablet, IsAssistant = false,
                Languages = new List<string>()
            });
            db.SaveChanges();

            var result = await BuildController(db).Chat(MakeRequest("i1"));

            Assert.IsType<ForbidResult>(result);
        }

        [Fact]
        public async Task Chat_NoAppInstance_ReturnsForbid()
        {
            using var db = DbContextFactory.Create();
            db.Instances.Add(new Instance
            {
                Id = "i1", Name = "Musée", IsAssistant = true, DateCreation = DateTime.UtcNow
            });
            db.SaveChanges();

            var result = await BuildController(db).Chat(MakeRequest("i1"));

            Assert.IsType<ForbidResult>(result);
        }

        // ── JOURNALISATION DES QUESTIONS ─────────────────────────────────────

        /// <summary>
        /// Un tour déclenché par le mode proactif ne doit pas apparaître dans
        /// « Ce que demandent vos visiteurs » : sa « question » est une consigne que le
        /// système s'est écrite à lui-même. Mais ses jetons sont bien consommés, donc
        /// bien comptés — c'est la paire qui compte, pas chaque moitié isolément.
        /// </summary>
        [Fact]
        public async Task Chat_AutoTriggered_CountsTokensButLogsNoVisitorQuestion()
        {
            using var db = DbContextFactory.Create();
            SeedAssistantInstance(db);

            var request = MakeRequest("i1");
            request.IsAutoTriggered = true;
            await BuildController(db).Chat(request);

            Assert.Empty(db.VisitorQuestions);
            Assert.Equal(42, db.Instances.First().AiTokensThisMonth);
        }

        [Fact]
        public async Task Chat_AskedByVisitor_LogsVisitorQuestion()
        {
            using var db = DbContextFactory.Create();
            SeedAssistantInstance(db);

            await BuildController(db).Chat(MakeRequest("i1"));

            var logged = Assert.Single(db.VisitorQuestions);
            Assert.Equal("Bonjour", logged.Question);
            Assert.Equal(42, db.Instances.First().AiTokensThisMonth);
        }

        /// <summary>
        /// Deux tours d'une même conversation partagent leur ConversationId — c'est le seul
        /// lien entre eux côté serveur, l'historique étant reconstruit par le client.
        /// ⚠️ Aucun client ne l'envoyait jusqu'au 2026-08-13 : le repli `Guid.NewGuid()`
        /// s'appliquait à chaque appel, donc chaque question formait sa propre conversation.
        /// </summary>
        [Fact]
        public async Task Chat_SameConversationId_LinksBothTurns()
        {
            using var db = DbContextFactory.Create();
            SeedAssistantInstance(db);

            var controller = BuildController(db);
            var first = MakeRequest("i1");
            first.ConversationId = "conv-1";
            var second = MakeRequest("i1");
            second.ConversationId = "conv-1";

            await controller.Chat(first);
            await controller.Chat(second);

            Assert.Equal(2, db.VisitorQuestions.Count());
            Assert.All(db.VisitorQuestions, q => Assert.Equal("conv-1", q.ConversationId));
        }

        [Fact]
        public async Task Chat_NoConversationId_FallsBackToAGeneratedOne()
        {
            using var db = DbContextFactory.Create();
            SeedAssistantInstance(db);

            await BuildController(db).Chat(MakeRequest("i1"));

            Assert.False(string.IsNullOrWhiteSpace(db.VisitorQuestions.First().ConversationId));
        }

        private static void SeedAssistantInstance(MyInfoMateDbContext db)
        {
            db.Instances.Add(new Instance
            {
                Id = "i1", Name = "Musée", IsAssistant = true, DateCreation = DateTime.UtcNow,
                AiTokensPerMonth = 1_000, AiUsageMonthKey = DateTime.UtcNow.ToString("yyyy-MM")
            });
            db.ApplicationInstances.Add(new ApplicationInstance
            {
                Id = "ai1", InstanceId = "i1", AppType = AppType.Tablet, IsAssistant = true,
                Languages = new List<string>()
            });
            db.SaveChanges();
        }

        // ── QUOTA COUNTER ────────────────────────────────────────────────────

        [Fact]
        public async Task Chat_FirstRequestOfMonth_ResetsCounterAndAddsTokensUsed()
        {
            using var db = DbContextFactory.Create();
            db.Instances.Add(new Instance
            {
                Id = "i1", Name = "Musée", IsAssistant = true, DateCreation = DateTime.UtcNow,
                AiTokensThisMonth = 99, AiTokensPerMonth = 1_000, AiUsageMonthKey = "2020-01"
            });
            db.ApplicationInstances.Add(new ApplicationInstance
            {
                Id = "ai1", InstanceId = "i1", AppType = AppType.Tablet, IsAssistant = true,
                Languages = new List<string>()
            });
            db.SaveChanges();

            await BuildController(db).Chat(MakeRequest("i1"));

            var inst = db.Instances.First();
            Assert.Equal(42, inst.AiTokensThisMonth);
            Assert.Equal(DateTime.UtcNow.ToString("yyyy-MM"), inst.AiUsageMonthKey);
        }

        [Fact]
        public async Task Chat_SameMonth_AddsTokensUsedToCounter()
        {
            using var db = DbContextFactory.Create();
            var monthKey = DateTime.UtcNow.ToString("yyyy-MM");
            db.Instances.Add(new Instance
            {
                Id = "i1", Name = "Musée", IsAssistant = true, DateCreation = DateTime.UtcNow,
                AiTokensThisMonth = 3, AiTokensPerMonth = 1_000, AiUsageMonthKey = monthKey
            });
            db.ApplicationInstances.Add(new ApplicationInstance
            {
                Id = "ai1", InstanceId = "i1", AppType = AppType.Tablet, IsAssistant = true,
                Languages = new List<string>()
            });
            db.SaveChanges();

            await BuildController(db).Chat(MakeRequest("i1"));

            Assert.Equal(45, db.Instances.First().AiTokensThisMonth);
        }

        [Fact]
        public async Task Chat_QuotaAlreadyReached_ReturnsTooManyRequestsWithoutCallingAssistantService()
        {
            using var db = DbContextFactory.Create();
            var monthKey = DateTime.UtcNow.ToString("yyyy-MM");
            db.Instances.Add(new Instance
            {
                Id = "i1", Name = "Musée", IsAssistant = true, DateCreation = DateTime.UtcNow,
                AiTokensThisMonth = 100, AiTokensPerMonth = 100, AiUsageMonthKey = monthKey
            });
            db.ApplicationInstances.Add(new ApplicationInstance
            {
                Id = "ai1", InstanceId = "i1", AppType = AppType.Tablet, IsAssistant = true,
                Languages = new List<string>()
            });
            db.SaveChanges();

            var mockService = new Mock<IAssistantService>();
            mockService.Setup(s => s.ChatAsync(It.IsAny<AiChatRequest>())).ReturnsAsync(FakeResponse);

            var result = await BuildController(db, mockService).Chat(MakeRequest("i1"));

            var status = Assert.IsType<ObjectResult>(result);
            Assert.Equal(429, status.StatusCode);
            mockService.Verify(s => s.ChatAsync(It.IsAny<AiChatRequest>()), Times.Never);
        }

        [Fact]
        public async Task Chat_PlanWithoutAi_ReturnsForbiddenWithoutCallingAssistantService()
        {
            using var db = DbContextFactory.Create();
            db.Instances.Add(new Instance
            {
                // AiTokensPerMonth à 0 = pas d'IA dans le plan, et surtout pas « illimité » :
                // c'est l'état de plan-starter et de toute instance fraîchement migrée.
                Id = "i1", Name = "Musée", IsAssistant = true, DateCreation = DateTime.UtcNow,
                AiTokensPerMonth = 0, AiUsageMonthKey = DateTime.UtcNow.ToString("yyyy-MM")
            });
            db.ApplicationInstances.Add(new ApplicationInstance
            {
                Id = "ai1", InstanceId = "i1", AppType = AppType.Tablet, IsAssistant = true,
                Languages = new List<string>()
            });
            db.SaveChanges();

            var mockService = new Mock<IAssistantService>();
            mockService.Setup(s => s.ChatAsync(It.IsAny<AiChatRequest>())).ReturnsAsync(FakeResponse);

            var result = await BuildController(db, mockService).Chat(MakeRequest("i1"));

            var status = Assert.IsType<ObjectResult>(result);
            Assert.Equal(403, status.StatusCode);
            mockService.Verify(s => s.ChatAsync(It.IsAny<AiChatRequest>()), Times.Never);
        }

        // ── NOMINAL ──────────────────────────────────────────────────────────

        [Fact]
        public async Task Chat_Success_CallsAssistantServiceAndReturns200()
        {
            using var db = DbContextFactory.Create();
            var mockService = new Mock<IAssistantService>();
            mockService.Setup(s => s.ChatAsync(It.IsAny<AiChatRequest>())).ReturnsAsync(FakeResponse);

            db.Instances.Add(new Instance
            {
                Id = "i1", Name = "Musée", IsAssistant = true, DateCreation = DateTime.UtcNow,
                AiTokensPerMonth = 1_000, AiUsageMonthKey = DateTime.UtcNow.ToString("yyyy-MM")
            });
            db.ApplicationInstances.Add(new ApplicationInstance
            {
                Id = "ai1", InstanceId = "i1", AppType = AppType.Tablet, IsAssistant = true,
                Languages = new List<string>()
            });
            db.SaveChanges();

            var result = await BuildController(db, mockService).Chat(MakeRequest("i1"));

            var ok = Assert.IsType<OkObjectResult>(result);
            Assert.Equal(FakeResponse, ok.Value);
            mockService.Verify(s => s.ChatAsync(It.IsAny<AiChatRequest>()), Times.Once);
        }
    }
}