using Hangfire;
using Manager.Services;
using Manager.Interfaces.Models;
using ManagerService.Controllers;
using ManagerService.Data;
using ManagerService.DTOs;
using ManagerService.Helpers;
using ManagerService.Services;
using ManagerService.Tests.Infrastructure;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging.Abstractions;
using Moq;
using Xunit;

namespace ManagerService.Tests.Controllers
{
    public class InstanceControllerTests
    {
        private InstanceController BuildController(MyInfoMateDbContext db, Mock<IBackgroundJobClient> jobs = null)
        {
            var cfg = FakeMongoConfig.Create();
            var instanceService = new InstanceDatabaseService(cfg);
            var userService = new UserDatabaseService(cfg);
            var profileLogic = new ProfileLogic(NullLogger<ProfileLogic>.Instance);
            var apiKeyService = new ApiKeyDatabaseService(db);

            return new InstanceController(
                NullLogger<InstanceController>.Instance,
                instanceService,
                userService,
                profileLogic,
                db,
                apiKeyService,
                (jobs ?? new Mock<IBackgroundJobClient>()).Object);
        }

        // ── CREATE ───────────────────────────────────────────────────────────

        [Fact]
        public void CreateInstance_DuplicateName_Returns409()
        {
            using var db = DbContextFactory.Create();
            db.Instances.Add(new Instance { Id = "i1", Name = "Musée", DateCreation = DateTime.UtcNow });
            db.SaveChanges();

            var result = BuildController(db).CreateInstance(new InstanceDTO { name = "Musée" });

            Assert.IsType<ConflictObjectResult>(result);
        }

        [Fact]
        public void CreateInstance_ValidDto_PersistsAndReturnsDto()
        {
            using var db = DbContextFactory.Create();

            var result = BuildController(db).CreateInstance(new InstanceDTO { name = "Nouveau" });

            Assert.IsType<OkObjectResult>(result);
            Assert.Equal(1, db.Instances.Count());
        }

        [Fact]
        public void CreateInstance_NullDto_Returns400()
        {
            using var db = DbContextFactory.Create();

            var result = BuildController(db).CreateInstance(null!);

            Assert.IsType<BadRequestObjectResult>(result);
        }

        // ── UPDATE ───────────────────────────────────────────────────────────

        [Fact]
        public void Updateinstance_ClearSubscriptionPlan_SetsNull()
        {
            using var db = DbContextFactory.Create();
            db.SubscriptionPlans.Add(new SubscriptionPlan { Id = "p1", Name = "Starter" });
            db.Instances.Add(new Instance { Id = "i1", Name = "Musée", SubscriptionPlanId = "p1", DateCreation = DateTime.UtcNow });
            db.SaveChanges();

            // subscriptionPlanId = "" → doit effacer le plan
            var result = BuildController(db).Updateinstance(new InstanceDTO { id = "i1", subscriptionPlanId = "" });

            Assert.IsType<OkObjectResult>(result);
            Assert.Null(db.Instances.First().SubscriptionPlanId);
        }

        [Fact]
        public void Updateinstance_SetSubscriptionPlan_Updates()
        {
            using var db = DbContextFactory.Create();
            db.SubscriptionPlans.Add(new SubscriptionPlan { Id = "p1", Name = "Starter" });
            db.Instances.Add(new Instance { Id = "i1", Name = "Musée", DateCreation = DateTime.UtcNow });
            db.SaveChanges();

            var result = BuildController(db).Updateinstance(new InstanceDTO { id = "i1", subscriptionPlanId = "p1" });

            Assert.IsType<OkObjectResult>(result);
            Assert.Equal("p1", db.Instances.First().SubscriptionPlanId);
        }

        [Fact]
        public void Updateinstance_ChangingPlan_CopiesPlanQuotasOntoInstance()
        {
            using var db = DbContextFactory.Create();
            db.SubscriptionPlans.Add(new SubscriptionPlan
            {
                Id = "p-premium", Name = "Premium",
                StorageQuotaBytes = 50_000, AiTokensPerMonth = 20_000, HasStats = true, HasAdvancedStats = true
            });
            db.Instances.Add(new Instance { Id = "i1", Name = "Musée", DateCreation = DateTime.UtcNow });
            db.SaveChanges();

            BuildController(db).Updateinstance(new InstanceDTO { id = "i1", subscriptionPlanId = "p-premium" });

            // CreateInstance recopiait les quotas du plan, pas Update : un client passé à un plan
            // payant gardait 0 jeton IA, donc pas de guide, tout en payant pour.
            var instance = db.Instances.First();
            Assert.Equal(20_000, instance.AiTokensPerMonth);
            Assert.Equal(50_000, instance.StorageQuotaBytes);
            Assert.True(instance.HasAdvancedStats);
        }

        [Fact]
        public void Updateinstance_GainingAiQuota_EnqueuesBackfill()
        {
            using var db = DbContextFactory.Create();
            db.SubscriptionPlans.Add(new SubscriptionPlan { Id = "p-premium", Name = "Premium", AiTokensPerMonth = 20_000 });
            db.Instances.Add(new Instance { Id = "i1", Name = "Musée", DateCreation = DateTime.UtcNow, AiTokensPerMonth = 0 });
            db.SaveChanges();

            var jobs = new Mock<IBackgroundJobClient>();
            BuildController(db, jobs).Updateinstance(new InstanceDTO { id = "i1", subscriptionPlanId = "p-premium" });

            // Rien n'a été indexé tant que l'instance n'avait pas droit à l'IA : sans ce
            // rattrapage le client paie un guide qui ne connaît rien de son contenu.
            jobs.Verify(j => j.Create(It.IsAny<Hangfire.Common.Job>(), It.IsAny<Hangfire.States.IState>()), Times.Once);
        }

        [Fact]
        public void Updateinstance_PlanUnchanged_DoesNotEnqueueBackfill()
        {
            using var db = DbContextFactory.Create();
            db.SubscriptionPlans.Add(new SubscriptionPlan { Id = "p-premium", Name = "Premium", AiTokensPerMonth = 20_000 });
            db.Instances.Add(new Instance
            {
                Id = "i1", Name = "Musée", DateCreation = DateTime.UtcNow,
                SubscriptionPlanId = "p-premium", AiTokensPerMonth = 20_000
            });
            db.SaveChanges();

            var jobs = new Mock<IBackgroundJobClient>();
            BuildController(db, jobs).Updateinstance(new InstanceDTO { id = "i1", name = "Musée d'Ixelles" });

            jobs.Verify(j => j.Create(It.IsAny<Hangfire.Common.Job>(), It.IsAny<Hangfire.States.IState>()), Times.Never);
        }

        [Fact]
        public void Updateinstance_UnknownId_Returns404()
        {
            using var db = DbContextFactory.Create();

            var result = BuildController(db).Updateinstance(new InstanceDTO { id = "unknown", name = "X" });

            Assert.IsType<NotFoundObjectResult>(result);
        }

        // ── GET QUOTA ────────────────────────────────────────────────────────

        [Fact]
        public void GetQuota_UnknownInstance_Returns404()
        {
            using var db = DbContextFactory.Create();

            var result = BuildController(db).GetQuota("unknown");

            Assert.IsType<NotFoundObjectResult>(result);
        }

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

            var result = BuildController(db).GetQuota("i1");

            var ok = Assert.IsType<OkObjectResult>(result);
            var dto = Assert.IsType<InstanceQuotaDTO>(ok.Value);
            Assert.Equal(0, dto.storageQuotaBytes);
            Assert.Equal(0, dto.aiTokensPerMonth);
        }

        [Fact]
        public void GetQuota_WithPlan_ReturnsQuotaFromPlan()
        {
            using var db = DbContextFactory.Create();
            db.SubscriptionPlans.Add(new SubscriptionPlan
            {
                Id = "p1", Name = "Standard",
                StorageQuotaBytes = 10_000_000_000L,
                AiTokensPerMonth = 100
            });
            db.Instances.Add(new Instance
            {
                Id = "i1", Name = "Musée", SubscriptionPlanId = "p1", DateCreation = DateTime.UtcNow
            });
            db.SaveChanges();

            var result = BuildController(db).GetQuota("i1");

            var ok = Assert.IsType<OkObjectResult>(result);
            var dto = Assert.IsType<InstanceQuotaDTO>(ok.Value);
            Assert.Equal(10_000_000_000L, dto.storageQuotaBytes);
            Assert.Equal(100, dto.aiTokensPerMonth);
        }

        [Fact]
        public void GetQuota_SumsResourceSizeBytes()
        {
            using var db = DbContextFactory.Create();
            db.Instances.Add(new Instance { Id = "i1", Name = "Musée", DateCreation = DateTime.UtcNow });
            db.Resources.AddRange(
                new Resource { Id = "r1", InstanceId = "i1", Label = "img1", Type = ResourceType.Image, SizeBytes = 1000 },
                new Resource { Id = "r2", InstanceId = "i1", Label = "img2", Type = ResourceType.Image, SizeBytes = 2000 },
                new Resource { Id = "r3", InstanceId = "other", Label = "img3", Type = ResourceType.Image, SizeBytes = 9999 }
            );
            db.SaveChanges();

            var result = BuildController(db).GetQuota("i1");

            var ok = Assert.IsType<OkObjectResult>(result);
            var dto = Assert.IsType<InstanceQuotaDTO>(ok.Value);
            Assert.Equal(3000, dto.storageUsedBytes);
        }

        [Fact]
        public void GetQuota_AiUsage_CurrentMonth_ReturnsCount()
        {
            using var db = DbContextFactory.Create();
            var monthKey = DateTime.UtcNow.ToString("yyyy-MM");
            db.Instances.Add(new Instance
            {
                Id = "i1", Name = "Musée", DateCreation = DateTime.UtcNow,
                AiTokensThisMonth = 7, AiUsageMonthKey = monthKey
            });
            db.SaveChanges();

            var result = BuildController(db).GetQuota("i1");

            var ok = Assert.IsType<OkObjectResult>(result);
            var dto = Assert.IsType<InstanceQuotaDTO>(ok.Value);
            Assert.Equal(7, dto.aiTokensUsed);
        }

        [Fact]
        public void GetQuota_AiUsage_PreviousMonth_ReturnsZero()
        {
            using var db = DbContextFactory.Create();
            db.Instances.Add(new Instance
            {
                Id = "i1", Name = "Musée", DateCreation = DateTime.UtcNow,
                AiTokensThisMonth = 7, AiUsageMonthKey = "2020-01"
            });
            db.SaveChanges();

            var result = BuildController(db).GetQuota("i1");

            var ok = Assert.IsType<OkObjectResult>(result);
            var dto = Assert.IsType<InstanceQuotaDTO>(ok.Value);
            Assert.Equal(0, dto.aiTokensUsed);
        }

        // ── DELETE ───────────────────────────────────────────────────────────

        [Fact]
        public void DeleteInstance_CascadesUsers()
        {
            using var db = DbContextFactory.Create();
            db.Instances.Add(new Instance { Id = "i1", Name = "Musée", DateCreation = DateTime.UtcNow });
            db.Users.AddRange(
                new User { Id = "u1", Email = "a@test.be", Password = "x", LastName = "A", Token = "t1", InstanceId = "i1" },
                new User { Id = "u2", Email = "b@test.be", Password = "x", LastName = "B", Token = "t2", InstanceId = "i1" }
            );
            db.SaveChanges();

            var result = BuildController(db).DeleteInstance("i1");

            var status = Assert.IsType<ObjectResult>(result);
            Assert.Equal(202, status.StatusCode);
            Assert.Equal(0, db.Instances.Count());
            Assert.Equal(0, db.Users.Count());
        }

        [Fact]
        public void DeleteInstance_UnknownId_Returns404()
        {
            using var db = DbContextFactory.Create();

            var result = BuildController(db).DeleteInstance("unknown");

            Assert.IsType<NotFoundObjectResult>(result);
        }
    }
}