using Manager.DTOs;
using ManagerService.Controllers;
using ManagerService.Data;
using ManagerService.DTOs;
using ManagerService.Tests.Infrastructure;
using Microsoft.AspNetCore.Mvc;
using System;
using System.Collections.Generic;
using System.Linq;
using Xunit;

namespace ManagerService.Tests.Controllers
{
    public class StatsControllerTests
    {
        // GetSummary vérifie les droits de l'appelant (IsSuperAdmin / instance du token) :
        // sans utilisateur, User est null et le contrôleur renvoie un 500.
        private StatsController BuildController(MyInfoMateDbContext db,
            string callerRole = Permissions.SuperAdmin, string callerInstanceId = "i1")
        {
            var controller = new StatsController(db);
            FakeUser.SetUser(controller, FakeUser.Create(callerRole, callerInstanceId));
            return controller;
        }

        // ── TRACK EVENT ──────────────────────────────────────────────────────

        [Fact]
        public void TrackEvent_ValidDto_PersistsAndReturns204()
        {
            using var db = DbContextFactory.Create();

            var result = BuildController(db).TrackEvent(new VisitEventDTO
            {
                instanceId = "i1",
                sessionId = "s1",
                eventType = "SectionView",
                appType = "Mobile"
            });

            Assert.IsType<NoContentResult>(result);
            Assert.Equal(1, db.VisitEvents.Count());
        }

        [Fact]
        public void TrackEvent_MissingInstanceId_Returns400()
        {
            using var db = DbContextFactory.Create();

            var result = BuildController(db).TrackEvent(new VisitEventDTO
            {
                instanceId = "",
                eventType = "SectionView",
                appType = "Mobile"
            });

            Assert.IsType<BadRequestObjectResult>(result);
        }

        [Fact]
        public void TrackEvent_UnknownEventType_Returns400()
        {
            using var db = DbContextFactory.Create();

            var result = BuildController(db).TrackEvent(new VisitEventDTO
            {
                instanceId = "i1",
                eventType = "InvalidType",
                appType = "Mobile"
            });

            Assert.IsType<BadRequestObjectResult>(result);
        }

        // ── GET SUMMARY ──────────────────────────────────────────────────────

        [Fact]
        public void GetSummary_MissingInstanceId_Returns400()
        {
            using var db = DbContextFactory.Create();

            var result = BuildController(db).GetSummary("", null, null, null);

            Assert.IsType<BadRequestObjectResult>(result);
        }

        [Fact]
        public void GetSummary_FiltersToInstance()
        {
            using var db = DbContextFactory.Create();
            db.VisitEvents.AddRange(
                new VisitEvent { Id = "e1", InstanceId = "i1", SessionId = "s1", EventType = VisitEventType.SectionView, Timestamp = DateTime.UtcNow },
                new VisitEvent { Id = "e2", InstanceId = "other", SessionId = "s2", EventType = VisitEventType.SectionView, Timestamp = DateTime.UtcNow }
            );
            db.SaveChanges();

            var result = BuildController(db).GetSummary("i1", null, null, null);

            var ok = Assert.IsType<OkObjectResult>(result);
            var summary = Assert.IsType<StatsSummaryDTO>(ok.Value);
            Assert.Equal(1, summary.TotalSessions);
        }

        [Fact]
        public void GetSummary_CountsDistinctSessions()
        {
            using var db = DbContextFactory.Create();
            db.VisitEvents.AddRange(
                new VisitEvent { Id = "e1", InstanceId = "i1", SessionId = "session-A", EventType = VisitEventType.SectionView, Timestamp = DateTime.UtcNow },
                new VisitEvent { Id = "e2", InstanceId = "i1", SessionId = "session-A", EventType = VisitEventType.SectionView, Timestamp = DateTime.UtcNow },
                new VisitEvent { Id = "e3", InstanceId = "i1", SessionId = "session-B", EventType = VisitEventType.SectionView, Timestamp = DateTime.UtcNow }
            );
            db.SaveChanges();

            var result = BuildController(db).GetSummary("i1", null, null, null);

            var ok = Assert.IsType<OkObjectResult>(result);
            var summary = Assert.IsType<StatsSummaryDTO>(ok.Value);
            Assert.Equal(2, summary.TotalSessions);
        }

        /// <summary>
        /// Le vocal se compte en **sessions ayant utilisé le vocal**, pas en sessions dont
        /// l'AppType vaudrait Voice : une même session mêle la voix et le tactile, c'est
        /// tout l'objet du miroir. Ici la session A fait les deux et compte une fois.
        /// </summary>
        [Fact]
        public void GetSummary_VoiceSessions_CountsSessionsThatUsedVoiceAtLeastOnce()
        {
            using var db = DbContextFactory.Create();
            db.VisitEvents.AddRange(
                new VisitEvent { Id = "e1", InstanceId = "i1", SessionId = "session-A", EventType = VisitEventType.SectionView, Metadata = "{\"voice\":true}", Timestamp = DateTime.UtcNow },
                new VisitEvent { Id = "e2", InstanceId = "i1", SessionId = "session-A", EventType = VisitEventType.SectionView, Timestamp = DateTime.UtcNow },
                new VisitEvent { Id = "e3", InstanceId = "i1", SessionId = "session-B", EventType = VisitEventType.SectionView, Timestamp = DateTime.UtcNow }
            );
            db.SaveChanges();

            var result = BuildController(db).GetSummary("i1", null, null, null);

            var ok = Assert.IsType<OkObjectResult>(result);
            var summary = Assert.IsType<StatsSummaryDTO>(ok.Value);
            Assert.Equal(1, summary.VoiceSessions);
            Assert.Equal(2, summary.TotalSessions);
        }

        [Fact]
        public void GetSummary_VoiceSessions_ZeroWhenNothingIsVoice()
        {
            using var db = DbContextFactory.Create();
            db.VisitEvents.Add(new VisitEvent
            {
                Id = "e1", InstanceId = "i1", SessionId = "s1",
                EventType = VisitEventType.SectionView,
                Metadata = "{\"valid\":true}",
                Timestamp = DateTime.UtcNow
            });
            db.SaveChanges();

            var result = BuildController(db).GetSummary("i1", null, null, null);

            var ok = Assert.IsType<OkObjectResult>(result);
            Assert.Equal(0, Assert.IsType<StatsSummaryDTO>(ok.Value).VoiceSessions);
        }

        [Fact]
        public void GetSummary_AppliesDateRange()
        {
            using var db = DbContextFactory.Create();
            var inRange = DateTime.UtcNow.AddDays(-5);
            var outOfRange = DateTime.UtcNow.AddDays(-40);

            db.VisitEvents.AddRange(
                new VisitEvent { Id = "e1", InstanceId = "i1", SessionId = "s1", EventType = VisitEventType.SectionView, Timestamp = inRange },
                new VisitEvent { Id = "e2", InstanceId = "i1", SessionId = "s2", EventType = VisitEventType.SectionView, Timestamp = outOfRange }
            );
            db.SaveChanges();

            var from = DateTime.UtcNow.AddDays(-10);
            var to = DateTime.UtcNow;

            var result = BuildController(db).GetSummary("i1", from, to, null);

            var ok = Assert.IsType<OkObjectResult>(result);
            var summary = Assert.IsType<StatsSummaryDTO>(ok.Value);
            Assert.Equal(1, summary.TotalSessions);
        }

        [Fact]
        public void GetSummary_DefaultsTo30Days()
        {
            using var db = DbContextFactory.Create();
            // Event dans les 30 jours
            db.VisitEvents.Add(new VisitEvent
            {
                Id = "e1", InstanceId = "i1", SessionId = "s1",
                EventType = VisitEventType.SectionView, Timestamp = DateTime.UtcNow.AddDays(-5)
            });
            // Event au-delà des 30 jours
            db.VisitEvents.Add(new VisitEvent
            {
                Id = "e2", InstanceId = "i1", SessionId = "s2",
                EventType = VisitEventType.SectionView, Timestamp = DateTime.UtcNow.AddDays(-35)
            });
            db.SaveChanges();

            // Sans dates → filtre 30 derniers jours
            var result = BuildController(db).GetSummary("i1", null, null, null);

            var ok = Assert.IsType<OkObjectResult>(result);
            var summary = Assert.IsType<StatsSummaryDTO>(ok.Value);
            Assert.Equal(1, summary.TotalSessions);
        }

        // ── STATS AVANCÉES ───────────────────────────────────────────────────
        //
        // Sans Instance en base, hasAdvancedStats est faux et toute cette branche est
        // sautée : c'est le cas des tests ci-dessus. Ceux qui suivent la seedent, sans
        // quoi la moitié de GetSummary ne serait jamais exécutée par la suite.

        private static void SeedAdvancedInstance(MyInfoMateDbContext db)
        {
            db.Instances.Add(new Instance
            {
                Id = "i1",
                Name = "Instance de test",
                HasStats = true,
                HasAdvancedStats = true,
                StatsHistoryDays = MyInfoMateDbContext.StatsRetentionDays
            });
            db.SaveChanges();
        }

        private static VisitEvent Event(string id, VisitEventType type, string sessionId = "s1",
            string sectionId = null, string metadata = null, string language = null,
            AppType appType = AppType.Mobile, int? durationSeconds = null, DateTime? timestamp = null) =>
            new VisitEvent
            {
                Id = id,
                InstanceId = "i1",
                SessionId = sessionId,
                EventType = type,
                SectionId = sectionId,
                Metadata = metadata,
                Language = language,
                AppType = appType,
                DurationSeconds = durationSeconds,
                Timestamp = timestamp ?? DateTime.UtcNow
            };

        private static StatsSummaryDTO Summarize(MyInfoMateDbContext db, StatsController controller = null)
        {
            var result = (controller ?? BuildControllerStatic(db)).GetSummary("i1", null, null, null);
            var ok = Assert.IsType<OkObjectResult>(result);
            return Assert.IsType<StatsSummaryDTO>(ok.Value);
        }

        private static StatsController BuildControllerStatic(MyInfoMateDbContext db)
        {
            var controller = new StatsController(db);
            FakeUser.SetUser(controller, FakeUser.Create(Permissions.SuperAdmin, "i1"));
            return controller;
        }

        [Fact]
        public void GetSummary_WithoutAdvancedStats_SkipsAdvancedBlocks()
        {
            using var db = DbContextFactory.Create();
            db.Instances.Add(new Instance { Id = "i1", Name = "Basique", HasStats = true, HasAdvancedStats = false });
            db.VisitEvents.AddRange(
                Event("e1", VisitEventType.SectionView, sectionId: "sect-a", language: "fr"),
                Event("e2", VisitEventType.QrScan, metadata: "{\"valid\":true}"),
                Event("e3", VisitEventType.ArticleRead, sectionId: "sect-a")
            );
            db.SaveChanges();

            var summary = Summarize(db);

            Assert.Equal(1, summary.TotalSessions);
            Assert.Empty(summary.LanguageDistribution);
            Assert.Empty(summary.TopArticles);
            Assert.Equal(0, summary.QrScans.TotalScans);
            // Les stats de base, elles, restent servies
            Assert.Single(summary.TopSections);
            Assert.NotEmpty(summary.AppTypeDistribution);
        }

        [Fact]
        public void GetSummary_AvgVisitDuration_SumsPerSessionThenAverages()
        {
            using var db = DbContextFactory.Create();
            SeedAdvancedInstance(db);
            db.VisitEvents.AddRange(
                Event("e1", VisitEventType.SectionLeave, "s1", "sect-a", durationSeconds: 10),
                Event("e2", VisitEventType.SectionLeave, "s1", "sect-b", durationSeconds: 30),
                Event("e3", VisitEventType.SectionLeave, "s2", "sect-a", durationSeconds: 20)
            );
            db.SaveChanges();

            // s1 = 40, s2 = 20 → moyenne 30. Une moyenne sur les événements donnerait 20.
            Assert.Equal(30, Summarize(db).AvgVisitDurationSeconds);
        }

        [Fact]
        public void GetSummary_TopSections_CarryAvgDurationAndTitle()
        {
            using var db = DbContextFactory.Create();
            SeedAdvancedInstance(db);
            var section = TestSection.Article("sect-a", "i1", "A", "c1");
            section.Title = new List<TranslationDTO>
            {
                new TranslationDTO { language = "en", value = "Cellar" },
                new TranslationDTO { language = "fr", value = "La cave" }
            };
            db.Sections.Add(section);
            db.VisitEvents.AddRange(
                Event("e1", VisitEventType.SectionView, "s1", "sect-a"),
                Event("e2", VisitEventType.SectionLeave, "s1", "sect-a", durationSeconds: 10),
                Event("e3", VisitEventType.SectionLeave, "s2", "sect-a", durationSeconds: 20)
            );
            db.SaveChanges();

            var stat = Assert.Single(Summarize(db).TopSections);
            Assert.Equal("La cave", stat.SectionTitle);  // FR privilégié
            Assert.Equal(1, stat.Views);
            Assert.Equal(15, stat.AvgDurationSeconds);
        }

        [Fact]
        public void GetSummary_VisitsByDay_GroupsByCalendarDayAndChannel()
        {
            using var db = DbContextFactory.Create();
            SeedAdvancedInstance(db);
            var day = DateTime.UtcNow.AddDays(-3);
            db.VisitEvents.AddRange(
                Event("e1", VisitEventType.SectionView, "s1", timestamp: day, appType: AppType.Mobile),
                Event("e2", VisitEventType.SectionView, "s2", timestamp: day.AddHours(2), appType: AppType.Tablet),
                Event("e3", VisitEventType.SectionView, "s3", timestamp: day.AddDays(1), appType: AppType.Mobile)
            );
            db.SaveChanges();

            var days = Summarize(db).VisitsByDay;

            Assert.Equal(2, days.Count);
            Assert.Equal(day.ToString("yyyy-MM-dd"), days[0].Date);
            Assert.Equal(2, days[0].Total);
            Assert.Equal(1, days[0].Mobile);
            Assert.Equal(1, days[0].Tablet);
        }

        [Fact]
        public void GetSummary_LanguageDistribution_CountsOneEntryPerSession()
        {
            using var db = DbContextFactory.Create();
            SeedAdvancedInstance(db);
            var start = DateTime.UtcNow.AddHours(-2);
            db.VisitEvents.AddRange(
                Event("e1", VisitEventType.SectionView, "s1", language: "fr", timestamp: start),
                Event("e2", VisitEventType.SectionView, "s1", language: "fr", timestamp: start.AddMinutes(1)),
                // La session bascule en cours de route : c'est sa première langue qui compte
                Event("e3", VisitEventType.SectionView, "s1", language: "nl", timestamp: start.AddMinutes(2)),
                Event("e4", VisitEventType.SectionView, "s2", language: "nl", timestamp: start)
            );
            db.SaveChanges();

            var languages = Summarize(db).LanguageDistribution;

            Assert.Equal(1, languages["fr"]);
            Assert.Equal(1, languages["nl"]);
        }

        [Fact]
        public void GetSummary_AppTypeDistribution_CountsOneEntryPerSession()
        {
            using var db = DbContextFactory.Create();
            SeedAdvancedInstance(db);
            db.VisitEvents.AddRange(
                Event("e1", VisitEventType.SectionView, "s1", appType: AppType.Tablet),
                Event("e2", VisitEventType.SectionView, "s1", appType: AppType.Tablet),
                Event("e3", VisitEventType.SectionView, "s2", appType: AppType.Mobile)
            );
            db.SaveChanges();

            var appTypes = Summarize(db).AppTypeDistribution;

            Assert.Equal(1, appTypes["Tablet"]);
            Assert.Equal(1, appTypes["Mobile"]);
        }

        [Fact]
        public void GetSummary_MetadataStats_AreAggregated()
        {
            using var db = DbContextFactory.Create();
            SeedAdvancedInstance(db);
            db.VisitEvents.AddRange(
                Event("p1", VisitEventType.MapPoiTap, sectionId: "sect-map", metadata: "{\"geoPointId\":7,\"geoPointTitle\":\"Ruche\"}"),
                Event("p2", VisitEventType.MapPoiTap, sectionId: "sect-map", metadata: "{\"geoPointId\":7,\"geoPointTitle\":\"Ruche\"}"),
                Event("a1", VisitEventType.AgendaEventTap, metadata: "{\"eventId\":\"ev1\",\"eventTitle\":\"Concert\"}"),
                Event("g1", VisitEventType.GameComplete, metadata: "{\"gameType\":\"Puzzle\",\"durationSeconds\":60}"),
                Event("g2", VisitEventType.GameComplete, metadata: "{\"gameType\":\"Puzzle\",\"durationSeconds\":40}"),
                Event("m1", VisitEventType.MenuItemTap, metadata: "{\"targetSectionId\":\"sect-a\",\"menuItemTitle\":\"Accueil\"}"),
                Event("r1", VisitEventType.ArticleRead, sectionId: "sect-a")
            );
            db.SaveChanges();

            var summary = Summarize(db);

            var poi = Assert.Single(summary.TopPois);
            Assert.Equal(7, poi.GeoPointId);
            Assert.Equal(2, poi.Taps);
            Assert.Equal("sect-map", poi.SectionId);

            Assert.Equal("Concert", Assert.Single(summary.TopAgendaEvents).EventTitle);
            var game = Assert.Single(summary.GameStats);
            Assert.Equal(2, game.Completions);
            Assert.Equal(50, game.AvgDurationSeconds);
            Assert.Equal("Accueil", Assert.Single(summary.TopMenuItems).MenuItemTitle);
            Assert.Equal(1, Assert.Single(summary.TopArticles).Reads);
        }

        [Fact]
        public void GetSummary_QuizStats_AverageScorePerSection()
        {
            using var db = DbContextFactory.Create();
            SeedAdvancedInstance(db);
            db.VisitEvents.AddRange(
                Event("q1", VisitEventType.QuizComplete, "s1", "sect-quiz", "{\"score\":4,\"totalQuestions\":5}"),
                Event("q2", VisitEventType.QuizComplete, "s2", "sect-quiz", "{\"score\":2,\"totalQuestions\":5}"),
                // Metadata illisible : compté, à zéro, comme avant
                Event("q3", VisitEventType.QuizComplete, "s3", "sect-quiz", "pas du json")
            );
            db.SaveChanges();

            var quiz = Assert.Single(Summarize(db).QuizStats);
            Assert.Equal("sect-quiz", quiz.SectionId);
            Assert.Equal(3, quiz.Completions);
            Assert.Equal(2.0, quiz.AvgScore);
        }

        [Fact]
        public void GetSummary_QrScans_CountsScansWithoutMetadataInTotalOnly()
        {
            using var db = DbContextFactory.Create();
            SeedAdvancedInstance(db);
            db.VisitEvents.AddRange(
                Event("qr1", VisitEventType.QrScan, metadata: "{\"valid\":true}"),
                Event("qr2", VisitEventType.QrScan, metadata: "{\"valid\":false}"),
                Event("qr3", VisitEventType.QrScan)  // sans metadata : ni valide ni invalide
            );
            db.SaveChanges();

            var qr = Summarize(db).QrScans;

            Assert.Equal(3, qr.TotalScans);
            Assert.Equal(1, qr.ValidScans);
            Assert.Equal(1, qr.InvalidScans);
        }

        [Fact]
        public void GetSummary_HasStatsDisabled_ReturnsEmptySummary()
        {
            using var db = DbContextFactory.Create();
            db.Instances.Add(new Instance { Id = "i1", Name = "Sans stats", HasStats = false });
            db.VisitEvents.Add(Event("e1", VisitEventType.SectionView, sectionId: "sect-a"));
            db.SaveChanges();

            Assert.Equal(0, Summarize(db).TotalSessions);
        }

        [Fact]
        public void GetSummary_RetentionCapsTheRequestedRange()
        {
            // Le plan borne l'historique : une plage plus large que la rétention est
            // ramenée à la rétention, pas honorée.
            using var db = DbContextFactory.Create();
            db.Instances.Add(new Instance { Id = "i1", Name = "30 jours", HasStats = true, StatsHistoryDays = 30 });
            db.VisitEvents.AddRange(
                Event("e1", VisitEventType.SectionView, "s1", timestamp: DateTime.UtcNow.AddDays(-10)),
                Event("e2", VisitEventType.SectionView, "s2", timestamp: DateTime.UtcNow.AddDays(-90))
            );
            db.SaveChanges();

            var result = BuildControllerStatic(db).GetSummary("i1", DateTime.UtcNow.AddDays(-365), DateTime.UtcNow, null);
            var summary = Assert.IsType<StatsSummaryDTO>(Assert.IsType<OkObjectResult>(result).Value);

            Assert.Equal(1, summary.TotalSessions);
        }

        [Fact]
        public void GetSummary_TopSections_AggregatesByViewCount()
        {
            using var db = DbContextFactory.Create();
            db.VisitEvents.AddRange(
                new VisitEvent { Id = "e1", InstanceId = "i1", SessionId = "s1", EventType = VisitEventType.SectionView, SectionId = "sect-a", Timestamp = DateTime.UtcNow },
                new VisitEvent { Id = "e2", InstanceId = "i1", SessionId = "s2", EventType = VisitEventType.SectionView, SectionId = "sect-a", Timestamp = DateTime.UtcNow },
                new VisitEvent { Id = "e3", InstanceId = "i1", SessionId = "s3", EventType = VisitEventType.SectionView, SectionId = "sect-b", Timestamp = DateTime.UtcNow }
            );
            db.SaveChanges();

            var result = BuildController(db).GetSummary("i1", null, null, null);

            var ok = Assert.IsType<OkObjectResult>(result);
            var summary = Assert.IsType<StatsSummaryDTO>(ok.Value);
            Assert.Equal(2, summary.TopSections.Count);
            Assert.Equal("sect-a", summary.TopSections.First().SectionId);
            Assert.Equal(2, summary.TopSections.First().Views);
        }
    }
}