using ManagerService.Controllers;
using ManagerService.Data;
using ManagerService.DTOs;
using ManagerService.Tests.Infrastructure;
using Microsoft.AspNetCore.Mvc;
using Xunit;

namespace ManagerService.Tests.Controllers
{
    public class StatsControllerTests
    {
        private StatsController BuildController(MyInfoMateDbContext db) => new StatsController(db);

        // ── 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);
        }

        [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);
        }

        [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);
        }
    }
}