using Manager.Services;
using ManagerService.Controllers;
using ManagerService.Data;
using ManagerService.DTOs;
using ManagerService.Tests.Infrastructure;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging.Abstractions;
using System.Linq;
using Xunit;

namespace ManagerService.Tests.Controllers
{
    public class DeviceControllerTests
    {
        private static DeviceController BuildController(MyInfoMateDbContext db)
        {
            var cfg = FakeMongoConfig.Create();
            var controller = new DeviceController(
                NullLogger<DeviceController>.Instance,
                new DeviceDatabaseService(cfg),
                new ConfigurationDatabaseService(cfg),
                db);
            FakeUser.SetUser(controller, FakeUser.Create("Manager.instanceadmin", "inst-test"));
            return controller;
        }

        private static void SeedPrerequisites(MyInfoMateDbContext db)
        {
            db.Configurations.Add(new Configuration { Id = "conf-1", InstanceId = "inst-test", Label = "Conf", Title = new System.Collections.Generic.List<TranslationDTO>() });
            db.ApplicationInstances.Add(new ApplicationInstance { Id = "ai-1", InstanceId = "inst-test", AppType = AppType.Tablet });
            db.ApplicationInstances.Add(new ApplicationInstance { Id = "ai-vr", InstanceId = "inst-test", AppType = AppType.VR });
            db.SaveChanges();
        }

        // ── HEARTBEAT (XR-5) ─────────────────────────────────────────────────

        private static Device SeedDevice(MyInfoMateDbContext db, string instanceId = "inst-test")
        {
            var device = new Device
            {
                Id = "dev-1",
                Identifier = "headset-abc",
                InstanceId = instanceId,
                ConfigurationId = "conf-1",
                AppType = AppType.VR,
                Connected = false
            };
            db.Devices.Add(device);
            db.SaveChanges();
            return device;
        }

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

            var result = BuildController(db).Heartbeat("dev-1", new DeviceHeartbeatDTO
            {
                batteryLevel = "87",
                appVersion = "1.4.2"
            });

            Assert.IsType<OkObjectResult>(result);

            var device = db.Devices.First();
            Assert.Equal("87", device.BatteryLevel);
            Assert.Equal("1.4.2", device.AppVersion);
            Assert.NotNull(device.LastSeen);

            // Recevoir le battement est la preuve que l'appareil est en ligne : l'app
            // n'a pas à le déclarer.
            Assert.True(device.Connected);
        }

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

            BuildController(db).Heartbeat("dev-1", new DeviceHeartbeatDTO { batteryLevel = "50" });

            var device = db.Devices.First();
            Assert.Equal("inst-test", device.InstanceId);
            Assert.Equal("conf-1", device.ConfigurationId);
            Assert.Equal("headset-abc", device.Identifier);
        }

        [Fact]
        public void Heartbeat_OtherInstance_Returns403()
        {
            using var db = DbContextFactory.Create();
            SeedPrerequisites(db);
            SeedDevice(db, instanceId: "autre-instance");

            var result = BuildController(db).Heartbeat("dev-1", new DeviceHeartbeatDTO { batteryLevel = "10" });

            Assert.Equal(403, result.StatusCode);
        }

        [Fact]
        public void Heartbeat_UnknownDevice_Returns404()
        {
            using var db = DbContextFactory.Create();
            SeedPrerequisites(db);

            var result = BuildController(db).Heartbeat("nope", new DeviceHeartbeatDTO());

            Assert.IsType<NotFoundObjectResult>(result);
        }

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

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

            var result = BuildController(db).Create(new DeviceDetailDTO
            {
                identifier = "device-abc",
                instanceId = "inst-test",
                configurationId = "conf-1",
                name = "Tablet 1"
            });

            Assert.IsType<OkObjectResult>(result);
            Assert.Equal(1, db.Devices.Count());
            Assert.Equal("Tablet 1", db.Devices.First().Name);
        }

        [Fact]
        public void Create_ExistingIdentifier_UpdatesDeviceNoDuplicate()
        {
            using var db = DbContextFactory.Create();
            SeedPrerequisites(db);
            db.Devices.Add(new Device { Id = "d1", Identifier = "device-abc", InstanceId = "inst-test", ConfigurationId = "conf-1" });
            db.SaveChanges();

            var result = BuildController(db).Create(new DeviceDetailDTO
            {
                identifier = "device-abc",
                instanceId = "inst-test",
                configurationId = "conf-1",
                name = "Updated Name"
            });

            Assert.IsType<OkObjectResult>(result);
            Assert.Equal(1, db.Devices.Count()); // pas de doublon
            Assert.Equal("Updated Name", db.Devices.First().Name);
        }

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

            BuildController(db).Create(new DeviceDetailDTO
            {
                identifier = "device-abc",
                instanceId = "inst-test",
                configurationId = "conf-1",
                name = "Tablet 1"
            });

            Assert.Equal(1, db.AppConfigurationLinks.Count());
        }

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

        [Fact]
        public void Update_ExistingDevice_UpdatesName()
        {
            using var db = DbContextFactory.Create();
            db.Configurations.Add(new Configuration { Id = "conf-1", InstanceId = "inst-test", Label = "Conf", Title = new System.Collections.Generic.List<TranslationDTO>() });
            db.Devices.Add(new Device { Id = "d1", Identifier = "dev-1", InstanceId = "inst-test", Name = "Old Name", ConfigurationId = "conf-1" });
            db.SaveChanges();

            var result = BuildController(db).Update(new DeviceDetailDTO { id = "d1", name = "New Name", instanceId = "inst-test", identifier = "dev-1" });

            Assert.IsType<OkObjectResult>(result);
            Assert.Equal("New Name", db.Devices.First().Name);
        }

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

        [Fact]
        public void Delete_ExistingDevice_Returns202()
        {
            using var db = DbContextFactory.Create();
            db.Configurations.Add(new Configuration { Id = "conf-1", InstanceId = "inst-test", Label = "Conf", Title = new System.Collections.Generic.List<TranslationDTO>() });
            db.Devices.Add(new Device { Id = "d1", Identifier = "dev-1", InstanceId = "inst-test", ConfigurationId = "conf-1" });
            db.SaveChanges();

            var result = BuildController(db).Delete("d1");

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

        [Fact]
        public void Delete_UnknownId_Returns404()
        {
            using var db = DbContextFactory.Create();

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

            Assert.IsType<NotFoundObjectResult>(result);
        }

        // ── CANAL (AppType) ──────────────────────────────────────────────────

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

            var result = BuildController(db).Create(new DeviceDetailDTO
            {
                identifier = "quest-1",
                instanceId = "inst-test",
                configurationId = "conf-1",
                name = "Casque 1",
                appType = AppType.VR
            });

            Assert.IsType<OkObjectResult>(result);
            Assert.Equal(AppType.VR, db.Devices.Single().AppType);
            // Le rattachement se faisait sur AppType.Tablet en dur : un casque atterrissait
            // dans l'onglet Kiosk.
            Assert.Equal("ai-vr", db.AppConfigurationLinks.Single().ApplicationInstanceId);
        }

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

            BuildController(db).Create(new DeviceDetailDTO
            {
                identifier = "device-abc",
                instanceId = "inst-test",
                configurationId = "conf-1",
                name = "Tablet 1"
            });

            Assert.Equal(AppType.Tablet, db.Devices.Single().AppType);
            Assert.Equal("ai-1", db.AppConfigurationLinks.Single().ApplicationInstanceId);
        }

        [Fact]
        public void Create_VrDevice_WithoutVrApplicationInstance_Returns404()
        {
            using var db = DbContextFactory.Create();
            db.Configurations.Add(new Configuration { Id = "conf-1", InstanceId = "inst-test", Label = "Conf", Title = new System.Collections.Generic.List<TranslationDTO>() });
            db.ApplicationInstances.Add(new ApplicationInstance { Id = "ai-1", InstanceId = "inst-test", AppType = AppType.Tablet });
            db.SaveChanges();

            var result = BuildController(db).Create(new DeviceDetailDTO
            {
                identifier = "quest-1",
                instanceId = "inst-test",
                configurationId = "conf-1",
                appType = AppType.VR
            });

            Assert.IsType<NotFoundObjectResult>(result);
            Assert.Equal(0, db.Devices.Count());
        }

        [Fact]
        public void Get_FiltersByAppType()
        {
            using var db = DbContextFactory.Create();
            SeedPrerequisites(db);
            db.Devices.Add(new Device { Id = "d1", Identifier = "tab-1", InstanceId = "inst-test", ConfigurationId = "conf-1", AppType = AppType.Tablet });
            db.Devices.Add(new Device { Id = "d2", Identifier = "quest-1", InstanceId = "inst-test", ConfigurationId = "conf-1", AppType = AppType.VR });
            db.SaveChanges();

            var vr = Assert.IsType<OkObjectResult>(BuildController(db).Get(null, AppType.VR));
            Assert.Equal("quest-1", Assert.Single((System.Collections.Generic.IEnumerable<DeviceDTO>)vr.Value).identifier);

            // Sans filtre : comportement historique, tous les appareils.
            var all = Assert.IsType<OkObjectResult>(BuildController(db).Get(null));
            Assert.Equal(2, ((System.Collections.Generic.IEnumerable<DeviceDTO>)all.Value).Count());
        }
    }
}