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
{
    /// <summary>
    /// GetSummary agrège désormais en SQL. Les tests InMemory tiennent la sémantique mais
    /// pas la traduction : le provider InMemory évalue tout côté client, donc une requête
    /// intraduisible y passerait au vert et exploserait en production. Ceux-ci s'exécutent
    /// contre un vrai PostgreSQL.
    /// </summary>
    [Collection(PostgresCollection.Name)]
    public class StatsControllerPostgresTests
    {
        private readonly PostgresFixture _postgres;

        public StatsControllerPostgresTests(PostgresFixture postgres)
        {
            _postgres = postgres;
        }

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

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

            var section = TestSection.Article("sect-a", "i1", "A", "c1");
            section.Title = new List<TranslationDTO> { new TranslationDTO { language = "fr", value = "La cave" } };
            db.Sections.Add(section);

            var day = DateTime.UtcNow.AddDays(-2);
            var events = new List<VisitEvent>
            {
                Ev("e1", VisitEventType.SectionView, "s1", day, sectionId: "sect-a", language: "fr", appType: AppType.Mobile),
                Ev("e2", VisitEventType.SectionView, "s2", day.AddHours(1), sectionId: "sect-a", language: "nl", appType: AppType.Tablet),
                Ev("e3", VisitEventType.SectionLeave, "s1", day.AddMinutes(5), sectionId: "sect-a", durationSeconds: 30),
                // s2 est une session tablette de bout en bout : un appType qui change en
                // cours de session n'existe pas, et l'y laisser fausserait la distribution.
                Ev("e4", VisitEventType.SectionLeave, "s2", day.AddHours(1).AddMinutes(5), sectionId: "sect-a", durationSeconds: 10, appType: AppType.Tablet),
                Ev("e5", VisitEventType.ArticleRead, "s1", day, sectionId: "sect-a"),
                Ev("e6", VisitEventType.QrScan, "s1", day, metadata: "{\"valid\":true}"),
                Ev("e7", VisitEventType.MapPoiTap, "s1", day, sectionId: "sect-a", metadata: "{\"geoPointId\":7,\"geoPointTitle\":\"Ruche\"}"),
                Ev("e8", VisitEventType.AgendaEventTap, "s2", day, metadata: "{\"eventId\":\"ev1\",\"eventTitle\":\"Concert\"}", appType: AppType.Tablet),
                Ev("e9", VisitEventType.GameComplete, "s1", day, metadata: "{\"gameType\":\"Puzzle\",\"durationSeconds\":60}"),
                Ev("e10", VisitEventType.MenuItemTap, "s2", day, metadata: "{\"targetSectionId\":\"sect-a\",\"menuItemTitle\":\"Accueil\"}", appType: AppType.Tablet),
                Ev("e11", VisitEventType.QuizComplete, "s1", day, sectionId: "sect-a", metadata: "{\"score\":4,\"totalQuestions\":5}")
            };

            db.VisitEvents.AddRange(events);
            db.SaveChanges();
        }

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

        private static StatsSummaryDTO Summarize(MyInfoMateDbContext db)
        {
            var result = BuildController(db).GetSummary("i1", null, null, null);

            // Le contrôleur enveloppe tout dans un try/catch qui rend 500 : une requête
            // intraduisible ne remonterait pas en exception mais en corps de réponse.
            // On lit donc le code avant de caster, sinon l'échec serait illisible.
            var objectResult = Assert.IsAssignableFrom<ObjectResult>(result);
            Assert.True(objectResult.StatusCode == 200, $"GetSummary a rendu {objectResult.StatusCode} : {objectResult.Value}");

            return Assert.IsType<StatsSummaryDTO>(objectResult.Value);
        }

        [SkippableFact]
        public void GetSummary_TranslatesToSql_OnTheBasicPlan()
        {
            Skip.IfNot(_postgres.Available, _postgres.SkipReason);

            using var db = _postgres.CreateMigratedContext("stats_basic");
            Seed(db, advanced: false);

            var summary = Summarize(db);

            Assert.Equal(2, summary.TotalSessions);
            Assert.Equal(20, summary.AvgVisitDurationSeconds);   // (30 + 10) / 2 sessions

            var section = Assert.Single(summary.TopSections);
            Assert.Equal("La cave", section.SectionTitle);
            Assert.Equal(2, section.Views);
            Assert.Equal(20, section.AvgDurationSeconds);

            var day = Assert.Single(summary.VisitsByDay);
            Assert.Equal(2, day.Total);
            Assert.Equal(1, day.Mobile);
            Assert.Equal(1, day.Tablet);

            Assert.Equal(1, summary.AppTypeDistribution["Mobile"]);
            Assert.Equal(1, summary.AppTypeDistribution["Tablet"]);

            // Plan sans stats avancées : rien de tout ça n'a été calculé.
            Assert.Empty(summary.LanguageDistribution);
            Assert.Empty(summary.TopPois);
            Assert.Equal(0, summary.QrScans.TotalScans);
        }

        [SkippableFact]
        public void GetSummary_TranslatesToSql_OnTheAdvancedPlan()
        {
            Skip.IfNot(_postgres.Available, _postgres.SkipReason);

            using var db = _postgres.CreateMigratedContext("stats_advanced");
            Seed(db, advanced: true);

            var summary = Summarize(db);

            Assert.Equal(1, summary.LanguageDistribution["fr"]);
            Assert.Equal(1, summary.LanguageDistribution["nl"]);
            Assert.Equal("Ruche", Assert.Single(summary.TopPois).Title);
            Assert.Equal("Concert", Assert.Single(summary.TopAgendaEvents).EventTitle);
            Assert.Equal("Puzzle", Assert.Single(summary.GameStats).GameType);
            Assert.Equal("Accueil", Assert.Single(summary.TopMenuItems).MenuItemTitle);
            Assert.Equal(1, Assert.Single(summary.TopArticles).Reads);
            Assert.Equal(1, summary.QrScans.TotalScans);

            var quiz = Assert.Single(summary.QuizStats);
            Assert.Equal("La cave", quiz.SectionTitle);
            Assert.Equal(4.0, quiz.AvgScore);
        }

        [SkippableFact]
        public void GetSummary_TranslatesToSql_WithAnAppTypeFilter()
        {
            Skip.IfNot(_postgres.Available, _postgres.SkipReason);

            using var db = _postgres.CreateMigratedContext("stats_filtered");
            Seed(db, advanced: true);

            var result = BuildController(db).GetSummary("i1", null, null, "Tablet");
            var objectResult = Assert.IsAssignableFrom<ObjectResult>(result);
            Assert.True(objectResult.StatusCode == 200, $"GetSummary a rendu {objectResult.StatusCode} : {objectResult.Value}");

            var summary = Assert.IsType<StatsSummaryDTO>(objectResult.Value);
            Assert.Equal(1, summary.TotalSessions);
            Assert.Equal(1, summary.AppTypeDistribution["Tablet"]);
        }

        /// <summary>
        /// Le comptage des sessions vocales filtre sur une sous-chaîne du JSON de Metadata.
        /// InMemory l'évalue côté client et passerait au vert quoi qu'il arrive : seul un
        /// vrai PostgreSQL dit si le `Contains` se traduit en `LIKE` plutôt que d'échouer.
        /// </summary>
        [SkippableFact]
        public void GetSummary_VoiceSessions_TranslatesToSql()
        {
            Skip.IfNot(_postgres.Available, _postgres.SkipReason);

            using var db = _postgres.CreateMigratedContext("stats_voice");
            Seed(db, advanced: true);
            // s1 utilise le vocal une fois ; le reste de sa session est tactile.
            db.VisitEvents.Add(Ev("e12", VisitEventType.SectionView, "s1",
                DateTime.UtcNow.AddDays(-2), sectionId: "sect-a", metadata: "{\"voice\":true}"));
            db.SaveChanges();

            var summary = Summarize(db);

            Assert.Equal(1, summary.VoiceSessions);
            Assert.Equal(2, summary.TotalSessions);
        }

        [SkippableFact]
        public void GetSummary_OnAnEmptyWindow_TranslatesWithoutFailing()
        {
            Skip.IfNot(_postgres.Available, _postgres.SkipReason);

            using var db = _postgres.CreateMigratedContext("stats_empty");
            Seed(db, advanced: true);

            // Fenêtre vide : les agrégats portent sur zéro ligne. C'est là qu'une moyenne
            // SQL rend NULL et qu'un cast maladroit lèverait.
            var result = BuildController(db).GetSummary("i1", DateTime.UtcNow.AddDays(-1), DateTime.UtcNow, null);
            var objectResult = Assert.IsAssignableFrom<ObjectResult>(result);
            Assert.True(objectResult.StatusCode == 200, $"GetSummary a rendu {objectResult.StatusCode} : {objectResult.Value}");

            var summary = Assert.IsType<StatsSummaryDTO>(objectResult.Value);
            Assert.Equal(0, summary.TotalSessions);
            Assert.Equal(0, summary.AvgVisitDurationSeconds);
            Assert.Empty(summary.TopSections);
        }
    }
}