Phase 12B: Continuity Explorer Page.

PlotLine/Controllers/ContinuityExplorerController.cs

@@ -0,0 +1,28 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using PlotLine.Services;
+using PlotLine.ViewModels;
+
+namespace PlotLine.Controllers;
+
+[Authorize]
+public sealed class ContinuityExplorerController(IStoryStateService storyState) : Controller
+{
+    public async Task<IActionResult> Index([FromQuery] ContinuityFilter filter)
+    {
+        if (filter.ProjectID == 0)
+        {
+            return BadRequest("ProjectID is required.");
+        }
+
+        var model = await storyState.GetContinuityExplorerAsync(filter);
+        return model is null ? NotFound() : View(model);
+    }
+
+    [HttpPost]
+    [ValidateAntiForgeryToken]
+    public IActionResult ApplyFilters(ContinuityFilter filter)
+    {
+        return RedirectToAction(nameof(Index), filter);
+    }
+}

PlotLine/Services/CoreServices.cs

@@ -114,6 +114,10 @@ public interface ISceneService
 public interface IStoryStateService
 {
     Task<StoryStateViewModel> GetStoryStateAsync(int sceneId);
+    Task<ContinuityExplorerViewModel?> GetContinuityExplorerAsync(ContinuityFilter filter);
+    Task<List<CharacterJourneyViewModel>> GetCharacterJourneyAsync(int projectId, int characterId, ContinuityFilter filter);
+    Task<List<AssetJourneyViewModel>> GetAssetJourneyAsync(int projectId, int assetId, ContinuityFilter filter);
+    Task<List<LocationActivityViewModel>> GetLocationActivityAsync(int projectId, int locationId, ContinuityFilter filter);
 }
 
 public interface IPlotService
@@ -2204,6 +2208,7 @@ public sealed class TimelineService(
 }
 
 public sealed class StoryStateService(
+    IProjectRepository projects,
     IBookRepository books,
     IChapterRepository chapters,
     ISceneRepository scenes,
@@ -2227,7 +2232,7 @@ public sealed class StoryStateService(
             return new StoryStateViewModel();
         }
 
-        var timeline = await timelineRepository.GetByProjectAsync(book.ProjectID, book.BookID, false, [], false);
+        var timeline = await timelineRepository.GetByProjectAsync(book.ProjectID, null, false, [], false);
         var orderedScenes = OrderScenes(timeline).ToList();
         var currentSceneIndex = orderedScenes.FindIndex(x => x.SceneID == sceneId);
         if (currentSceneIndex < 0)
@@ -2235,22 +2240,252 @@ public sealed class StoryStateService(
             return new StoryStateViewModel();
         }
 
-        var sceneIndexes = orderedScenes
+        var sceneIndexes = BuildSceneIndexes(orderedScenes);
-            .Select((scene, index) => new { scene.SceneID, Index = index })
-            .ToDictionary(x => x.SceneID, x => x.Index);
         var scenesThroughCurrent = orderedScenes.Take(currentSceneIndex + 1).ToList();
         var allowedSceneIds = scenesThroughCurrent.Select(x => x.SceneID).ToHashSet();
+        var allLocations = await locations.ListByProjectAsync(book.ProjectID);
 
-        var characterTimeline = await characters.GetTimelineAsync(book.ProjectID, book.BookID);
+        var characterTimeline = await characters.GetTimelineAsync(book.ProjectID, null);
-        var assetTimeline = await assets.GetTimelineAsync(book.ProjectID, book.BookID);
+        var assetTimeline = await assets.GetTimelineAsync(book.ProjectID, null);
         var assetLocations = await GetAssetLocationsThroughCurrentAsync(scenesThroughCurrent);
         var assetCustody = await GetAssetCustodyThroughCurrentAsync(assetTimeline.Assets);
 
-        return new StoryStateViewModel
+        var storyState = new StoryStateViewModel
         {
             Characters = BuildCharacterState(characterTimeline.Characters, characterTimeline.Appearances, sceneId, allowedSceneIds, sceneIndexes),
             Assets = BuildAssetState(assetTimeline.Assets, assetTimeline.Events, assetLocations, assetCustody, sceneId, allowedSceneIds, sceneIndexes, orderedScenes.ToDictionary(x => x.SceneID))
         };
+        storyState.Locations = BuildLocationState(allLocations, storyState);
+        return storyState;
+    }
+
+    public async Task<ContinuityExplorerViewModel?> GetContinuityExplorerAsync(ContinuityFilter filter)
+    {
+        NormaliseFilter(filter);
+        var project = await projects.GetAsync(filter.ProjectID);
+        if (project is null)
+        {
+            return null;
+        }
+
+        var timeline = await timelineRepository.GetByProjectAsync(filter.ProjectID, null, false, [], false);
+        var orderedScenes = OrderScenes(timeline).ToList();
+        var scopedScenes = ApplySceneRange(orderedScenes, timeline.Chapters, filter).ToList();
+        var allCharacters = await characters.ListCharactersAsync(filter.ProjectID);
+        var allAssets = await assets.ListAssetsAsync(filter.ProjectID);
+        var allLocations = await locations.ListByProjectAsync(filter.ProjectID);
+        filter.SelectedSceneID ??= scopedScenes.FirstOrDefault()?.SceneID ?? orderedScenes.FirstOrDefault()?.SceneID;
+
+        var model = new ContinuityExplorerViewModel
+        {
+            Project = project,
+            Filter = filter,
+            BookOptions = timeline.Books.Select(x => new SelectListItem($"Book {x.BookNumber}: {x.BookTitle}", x.BookID.ToString(), x.BookID == filter.BookID)).ToList(),
+            ChapterOptions = timeline.Chapters.Select(x => new SelectListItem($"Ch {x.ChapterNumber}: {x.ChapterTitle}", x.ChapterID.ToString(), x.ChapterID == filter.ChapterID)).ToList(),
+            SceneOptions = orderedScenes.Select(x => new SelectListItem($"Scene {x.SceneNumber:g}: {x.SceneTitle}", x.SceneID.ToString(), x.SceneID == filter.SelectedSceneID)).ToList(),
+            CharacterOptions = allCharacters.Select(x => new SelectListItem(x.CharacterName, x.CharacterID.ToString(), filter.CharacterIDs.Contains(x.CharacterID))).ToList(),
+            AssetOptions = allAssets.Select(x => new SelectListItem(x.AssetName, x.StoryAssetID.ToString(), filter.AssetIDs.Contains(x.StoryAssetID))).ToList(),
+            LocationOptions = allLocations.Select(x => new SelectListItem(x.LocationPath, x.LocationID.ToString(), filter.LocationIDs.Contains(x.LocationID))).ToList()
+        };
+
+        if (string.Equals(filter.DisplayMode, "StoryState", StringComparison.OrdinalIgnoreCase) && filter.SelectedSceneID.HasValue)
+        {
+            model.StoryState = await GetStoryStateAsync(filter.SelectedSceneID.Value);
+            FilterStoryState(model.StoryState, filter);
+        }
+        else if (string.Equals(filter.DisplayMode, "Journey", StringComparison.OrdinalIgnoreCase))
+        {
+            var characterIds = filter.IncludeCharacters
+                ? (filter.CharacterIDs.Any() ? filter.CharacterIDs : allCharacters.Select(x => x.CharacterID)).ToList()
+                : [];
+            var assetIds = filter.IncludeAssets
+                ? (filter.AssetIDs.Any() ? filter.AssetIDs : allAssets.Select(x => x.StoryAssetID)).ToList()
+                : [];
+
+            var characterJourney = new List<CharacterJourneyViewModel>();
+            foreach (var characterId in characterIds)
+            {
+                characterJourney.AddRange(await GetCharacterJourneyAsync(filter.ProjectID, characterId, filter));
+            }
+
+            var assetJourney = new List<AssetJourneyViewModel>();
+            foreach (var assetId in assetIds)
+            {
+                assetJourney.AddRange(await GetAssetJourneyAsync(filter.ProjectID, assetId, filter));
+            }
+
+            model.CharacterJourney = characterJourney;
+            model.AssetJourney = assetJourney;
+        }
+        else if (string.Equals(filter.DisplayMode, "LocationActivity", StringComparison.OrdinalIgnoreCase))
+        {
+            var locationIds = filter.IncludeLocations
+                ? (filter.LocationIDs.Any() ? filter.LocationIDs : allLocations.Select(x => x.LocationID)).ToList()
+                : [];
+
+            var activity = new List<LocationActivityViewModel>();
+            foreach (var locationId in locationIds)
+            {
+                activity.AddRange(await GetLocationActivityAsync(filter.ProjectID, locationId, filter));
+            }
+
+            model.LocationActivity = activity
+                .OrderBy(x => scopedScenes.FindIndex(scene => scene.SceneID == x.SceneID))
+                .ThenBy(x => x.LocationName)
+                .ToList();
+        }
+
+        return model;
+    }
+
+    public async Task<List<CharacterJourneyViewModel>> GetCharacterJourneyAsync(int projectId, int characterId, ContinuityFilter filter)
+    {
+        var context = await GetRangeContextAsync(projectId, filter);
+        var characterTimeline = await characters.GetTimelineAsync(projectId, null);
+        var character = characterTimeline.Characters.FirstOrDefault(x => x.CharacterID == characterId);
+        if (character is null)
+        {
+            return [];
+        }
+
+        var rows = characterTimeline.Appearances
+            .Where(x => x.CharacterID == characterId && x.LocationID.HasValue && context.AllowedSceneIds.Contains(x.SceneID))
+            .GroupBy(x => x.SceneID)
+            .Select(x => x.OrderByDescending(row => row.UpdatedDate).First())
+            .OrderBy(x => context.SceneIndexes.GetValueOrDefault(x.SceneID, -1))
+            .ToList();
+        var result = new List<CharacterJourneyViewModel>();
+        int? previousLocationId = null;
+
+        foreach (var row in rows)
+        {
+            if (row.LocationID == previousLocationId)
+            {
+                continue;
+            }
+
+            previousLocationId = row.LocationID;
+            result.Add(new CharacterJourneyViewModel
+            {
+                CharacterID = character.CharacterID,
+                CharacterName = character.CharacterName,
+                SceneID = row.SceneID,
+                SceneLabel = context.SceneLabels.GetValueOrDefault(row.SceneID, $"Scene {row.SceneNumber:g}"),
+                Location = row.LocationPath ?? row.LocationName ?? "Unknown"
+            });
+        }
+
+        return result;
+    }
+
+    public async Task<List<AssetJourneyViewModel>> GetAssetJourneyAsync(int projectId, int assetId, ContinuityFilter filter)
+    {
+        var context = await GetRangeContextAsync(projectId, filter);
+        var assetTimeline = await assets.GetTimelineAsync(projectId, null);
+        var asset = assetTimeline.Assets.FirstOrDefault(x => x.StoryAssetID == assetId);
+        if (asset is null)
+        {
+            return [];
+        }
+
+        var assetLocations = await GetAssetLocationsThroughCurrentAsync(context.ScopedScenes);
+        var assetCustody = await assets.ListCustodyByAssetAsync(assetId);
+        var assignments = BuildAssetAssignments(assetTimeline.Events, assetLocations, assetCustody, context.AllowedSceneIds);
+        var rows = assignments
+            .Where(x => x.StoryAssetID == assetId)
+            .GroupBy(x => x.SceneID)
+            .Select(x => x.OrderByDescending(row => row.Priority).ThenByDescending(row => row.UpdatedDate).First())
+            .OrderBy(x => context.SceneIndexes.GetValueOrDefault(x.SceneID, -1))
+            .ToList();
+        var result = new List<AssetJourneyViewModel>();
+        string? previousLabel = null;
+
+        foreach (var row in rows)
+        {
+            if (string.Equals(previousLabel, row.Label, StringComparison.OrdinalIgnoreCase))
+            {
+                continue;
+            }
+
+            previousLabel = row.Label;
+            result.Add(new AssetJourneyViewModel
+            {
+                StoryAssetID = asset.StoryAssetID,
+                AssetName = asset.AssetName,
+                SceneID = row.SceneID,
+                SceneLabel = context.SceneLabels.GetValueOrDefault(row.SceneID, "Unknown scene"),
+                HolderOrLocation = row.Label
+            });
+        }
+
+        return result;
+    }
+
+    public async Task<List<LocationActivityViewModel>> GetLocationActivityAsync(int projectId, int locationId, ContinuityFilter filter)
+    {
+        var context = await GetRangeContextAsync(projectId, filter);
+        var allLocations = await locations.ListByProjectAsync(projectId);
+        var location = allLocations.FirstOrDefault(x => x.LocationID == locationId);
+        if (location is null)
+        {
+            return [];
+        }
+
+        var characterTimeline = await characters.GetTimelineAsync(projectId, null);
+        var assetLocations = await GetAssetLocationsThroughCurrentAsync(context.ScopedScenes);
+        var characterIds = filter.CharacterIDs.ToHashSet();
+        var assetIds = filter.AssetIDs.ToHashSet();
+        var result = new List<LocationActivityViewModel>();
+
+        foreach (var scene in context.ScopedScenes)
+        {
+            var sceneCharacters = filter.IncludeCharacters
+                ? characterTimeline.Appearances
+                    .Where(x => x.SceneID == scene.SceneID && x.LocationID == locationId && (!characterIds.Any() || characterIds.Contains(x.CharacterID)))
+                    .Select(x => x.CharacterName)
+                    .Distinct(StringComparer.OrdinalIgnoreCase)
+                    .OrderBy(x => x)
+                    .ToList()
+                : [];
+            var sceneAssets = filter.IncludeAssets
+                ? assetLocations
+                    .Where(x => x.SceneID == scene.SceneID && x.LocationID == locationId && (!assetIds.Any() || assetIds.Contains(x.StoryAssetID)))
+                    .Select(x => x.AssetName)
+                    .Distinct(StringComparer.OrdinalIgnoreCase)
+                    .OrderBy(x => x)
+                    .ToList()
+                : [];
+
+            if (!sceneCharacters.Any() && !sceneAssets.Any())
+            {
+                continue;
+            }
+
+            result.Add(new LocationActivityViewModel
+            {
+                LocationID = location.LocationID,
+                LocationName = location.LocationPath,
+                SceneID = scene.SceneID,
+                SceneLabel = SceneLabel(scene.SceneNumber, scene.SceneTitle),
+                CharactersPresent = sceneCharacters.Any() ? string.Join(", ", sceneCharacters) : "None",
+                AssetsPresent = sceneAssets.Any() ? string.Join(", ", sceneAssets) : "None"
+            });
+        }
+
+        return result;
+    }
+
+    private async Task<RangeContext> GetRangeContextAsync(int projectId, ContinuityFilter filter)
+    {
+        NormaliseFilter(filter);
+        var timeline = await timelineRepository.GetByProjectAsync(projectId, null, false, [], false);
+        var orderedScenes = OrderScenes(timeline).ToList();
+        var scopedScenes = ApplySceneRange(orderedScenes, timeline.Chapters, filter).ToList();
+        return new RangeContext(
+            scopedScenes,
+            scopedScenes.Select(x => x.SceneID).ToHashSet(),
+            BuildSceneIndexes(orderedScenes),
+            orderedScenes.ToDictionary(x => x.SceneID, x => SceneLabel(x.SceneNumber, x.SceneTitle)));
     }
 
     private static IEnumerable<Scene> OrderScenes(TimelineData timeline)
@@ -2267,6 +2502,36 @@ public sealed class StoryStateService(
             .ThenBy(scene => scene.SceneID);
     }
 
+    private static IEnumerable<Scene> ApplySceneRange(IReadOnlyList<Scene> orderedScenes, IReadOnlyList<Chapter> chapters, ContinuityFilter filter)
+    {
+        if (string.Equals(filter.SceneRangeMode, "Book", StringComparison.OrdinalIgnoreCase) && filter.BookID.HasValue)
+        {
+            var chapterIds = chapters.Where(x => x.BookID == filter.BookID.Value).Select(x => x.ChapterID).ToHashSet();
+            return orderedScenes.Where(x => chapterIds.Contains(x.ChapterID));
+        }
+
+        if (string.Equals(filter.SceneRangeMode, "Chapter", StringComparison.OrdinalIgnoreCase) && filter.ChapterID.HasValue)
+        {
+            return orderedScenes.Where(x => x.ChapterID == filter.ChapterID.Value);
+        }
+
+        if (string.Equals(filter.SceneRangeMode, "Custom", StringComparison.OrdinalIgnoreCase) && (filter.StartSceneID.HasValue || filter.EndSceneID.HasValue))
+        {
+            var startIndex = filter.StartSceneID.HasValue ? orderedScenes.ToList().FindIndex(x => x.SceneID == filter.StartSceneID.Value) : 0;
+            var endIndex = filter.EndSceneID.HasValue ? orderedScenes.ToList().FindIndex(x => x.SceneID == filter.EndSceneID.Value) : orderedScenes.Count - 1;
+            startIndex = startIndex < 0 ? 0 : startIndex;
+            endIndex = endIndex < 0 ? orderedScenes.Count - 1 : endIndex;
+            if (startIndex > endIndex)
+            {
+                (startIndex, endIndex) = (endIndex, startIndex);
+            }
+
+            return orderedScenes.Skip(startIndex).Take(endIndex - startIndex + 1);
+        }
+
+        return orderedScenes;
+    }
+
     private async Task<IReadOnlyList<SceneAssetLocation>> GetAssetLocationsThroughCurrentAsync(IReadOnlyList<Scene> scenesThroughCurrent)
     {
         var rows = new List<SceneAssetLocation>();
@@ -2324,6 +2589,7 @@ public sealed class StoryStateService(
                 {
                     CharacterID = character.CharacterID,
                     CharacterName = character.CharacterName,
+                    LocationID = latest.LocationID,
                     CurrentLocation = latest.LocationPath ?? latest.LocationName ?? "Unknown",
                     State = latest.SceneID == currentSceneId ? "Explicit" : "Inferred",
                     LastConfirmed = SceneLabel(latest.SceneNumber, latest.SceneTitle)
@@ -2342,19 +2608,7 @@ public sealed class StoryStateService(
         IReadOnlyDictionary<int, int> sceneIndexes,
         IReadOnlyDictionary<int, Scene> scenesById)
     {
-        var stateAssignments = assetEvents
+        var assignments = BuildAssetAssignments(assetEvents, assetLocations, assetCustody, allowedSceneIds);
-            .Where(x => allowedSceneIds.Contains(x.SceneID) && !string.IsNullOrWhiteSpace(x.ToStateName))
-            .Select(x => new AssetStateAssignment(x.StoryAssetID, x.SceneID, x.ToStateName!, 1, x.UpdatedDate));
-        var locationAssignments = assetLocations
-            .Where(x => allowedSceneIds.Contains(x.SceneID))
-            .Select(x => new AssetStateAssignment(x.StoryAssetID, x.SceneID, x.LocationPath, 2, x.UpdatedDate));
-        var custodyAssignments = assetCustody
-            .Where(x => allowedSceneIds.Contains(x.SceneID) && !string.IsNullOrWhiteSpace(x.CustodianSummary))
-            .Select(x => new AssetStateAssignment(x.StoryAssetID, x.SceneID, x.CustodianSummary!, 3, x.UpdatedDate));
-        var assignments = stateAssignments
-            .Concat(locationAssignments)
-            .Concat(custodyAssignments)
-            .ToList();
 
         return projectAssets
             .OrderByDescending(x => x.Importance)
@@ -2381,6 +2635,7 @@ public sealed class StoryStateService(
                 {
                     StoryAssetID = asset.StoryAssetID,
                     AssetName = asset.AssetName,
+                    LocationID = latest.LocationID,
                     CurrentHolderOrLocation = latest.Label,
                     State = latest.SceneID == currentSceneId ? "Explicit" : "Inferred",
                     LastConfirmed = scenesById.TryGetValue(latest.SceneID, out var scene)
@@ -2391,6 +2646,92 @@ public sealed class StoryStateService(
             .ToList();
     }
 
+    private static List<AssetStateAssignment> BuildAssetAssignments(
+        IReadOnlyList<AssetEvent> assetEvents,
+        IReadOnlyList<SceneAssetLocation> assetLocations,
+        IReadOnlyList<AssetCustodyEvent> assetCustody,
+        IReadOnlySet<int> allowedSceneIds)
+    {
+        var stateAssignments = assetEvents
+            .Where(x => allowedSceneIds.Contains(x.SceneID) && !string.IsNullOrWhiteSpace(x.ToStateName))
+            .Select(x => new AssetStateAssignment(x.StoryAssetID, x.SceneID, null, x.ToStateName!, 1, x.UpdatedDate));
+        var locationAssignments = assetLocations
+            .Where(x => allowedSceneIds.Contains(x.SceneID))
+            .Select(x => new AssetStateAssignment(x.StoryAssetID, x.SceneID, x.LocationID, x.LocationPath, 2, x.UpdatedDate));
+        var custodyAssignments = assetCustody
+            .Where(x => allowedSceneIds.Contains(x.SceneID) && !string.IsNullOrWhiteSpace(x.CustodianSummary))
+            .Select(x => new AssetStateAssignment(x.StoryAssetID, x.SceneID, null, x.CustodianSummary!, 3, x.UpdatedDate));
+
+        return stateAssignments.Concat(locationAssignments).Concat(custodyAssignments).ToList();
+    }
+
+    private static List<LocationStoryStateViewModel> BuildLocationState(IReadOnlyList<LocationItem> allLocations, StoryStateViewModel storyState)
+    {
+        return allLocations
+            .OrderBy(x => x.LocationPath)
+            .Select(location => new LocationStoryStateViewModel
+            {
+                LocationID = location.LocationID,
+                LocationName = location.LocationName,
+                LocationPath = location.LocationPath,
+                CharactersPresent = storyState.Characters
+                    .Where(x => x.LocationID == location.LocationID)
+                    .Select(x => x.CharacterName)
+                    .OrderBy(x => x)
+                    .ToList(),
+                AssetsPresent = storyState.Assets
+                    .Where(x => x.LocationID == location.LocationID)
+                    .Select(x => x.AssetName)
+                    .OrderBy(x => x)
+                    .ToList()
+            })
+            .Where(x => x.CharactersPresent.Any() || x.AssetsPresent.Any())
+            .ToList();
+    }
+
+    private static void FilterStoryState(StoryStateViewModel storyState, ContinuityFilter filter)
+    {
+        storyState.Characters = filter.IncludeCharacters
+            ? storyState.Characters.Where(x => !filter.CharacterIDs.Any() || filter.CharacterIDs.Contains(x.CharacterID)).ToList()
+            : [];
+        storyState.Assets = filter.IncludeAssets
+            ? storyState.Assets.Where(x => !filter.AssetIDs.Any() || filter.AssetIDs.Contains(x.StoryAssetID)).ToList()
+            : [];
+        storyState.Locations = filter.IncludeLocations
+            ? storyState.Locations.Where(x => !filter.LocationIDs.Any() || filter.LocationIDs.Contains(x.LocationID)).ToList()
+            : [];
+    }
+
+    private static Dictionary<int, int> BuildSceneIndexes(IReadOnlyList<Scene> orderedScenes)
+    {
+        return orderedScenes
+            .Select((scene, index) => new { scene.SceneID, Index = index })
+            .ToDictionary(x => x.SceneID, x => x.Index);
+    }
+
+    private static void NormaliseFilter(ContinuityFilter filter)
+    {
+        if (filter.ProjectID <= 0)
+        {
+            return;
+        }
+
+        if (!filter.EntityTypes.Any())
+        {
+            filter.EntityTypes = ["Characters", "Assets", "Locations"];
+        }
+
+        if (string.IsNullOrWhiteSpace(filter.SceneRangeMode))
+        {
+            filter.SceneRangeMode = "EntireProject";
+        }
+
+        if (string.IsNullOrWhiteSpace(filter.DisplayMode))
+        {
+            filter.DisplayMode = "StoryState";
+        }
+    }
+
     private static string SceneLabel(decimal sceneNumber, string sceneTitle)
     {
         return string.IsNullOrWhiteSpace(sceneTitle)
@@ -2401,9 +2742,16 @@ public sealed class StoryStateService(
     private sealed record AssetStateAssignment(
         int StoryAssetID,
         int SceneID,
+        int? LocationID,
         string Label,
         int Priority,
         DateTime UpdatedDate);
+
+    private sealed record RangeContext(
+        IReadOnlyList<Scene> ScopedScenes,
+        IReadOnlySet<int> AllowedSceneIds,
+        IReadOnlyDictionary<int, int> SceneIndexes,
+        IReadOnlyDictionary<int, string> SceneLabels);
 }
 
 public sealed class PlotService(IProjectRepository projects, IBookRepository books, IPlotRepository plots, IProjectActivityService activity) : IPlotService

PlotLine/ViewModels/CoreViewModels.cs

@@ -241,12 +241,14 @@ public sealed class StoryStateViewModel
 {
     public List<CharacterStoryStateViewModel> Characters { get; set; } = [];
     public List<AssetStoryStateViewModel> Assets { get; set; } = [];
+    public List<LocationStoryStateViewModel> Locations { get; set; } = [];
 }
 
 public sealed class CharacterStoryStateViewModel
 {
     public int CharacterID { get; set; }
     public string CharacterName { get; set; } = string.Empty;
+    public int? LocationID { get; set; }
     public string CurrentLocation { get; set; } = "Unknown";
     public string State { get; set; } = "Unknown";
     public string LastConfirmed { get; set; } = "Never";
@@ -256,11 +258,85 @@ public sealed class AssetStoryStateViewModel
 {
     public int StoryAssetID { get; set; }
     public string AssetName { get; set; } = string.Empty;
+    public int? LocationID { get; set; }
     public string CurrentHolderOrLocation { get; set; } = "Unknown";
     public string State { get; set; } = "Unknown";
     public string LastConfirmed { get; set; } = "Never";
 }
 
+public sealed class LocationStoryStateViewModel
+{
+    public int LocationID { get; set; }
+    public string LocationName { get; set; } = string.Empty;
+    public string LocationPath { get; set; } = string.Empty;
+    public List<string> CharactersPresent { get; set; } = [];
+    public List<string> AssetsPresent { get; set; } = [];
+}
+
+public sealed class ContinuityFilter
+{
+    public int ProjectID { get; set; }
+    public List<string> EntityTypes { get; set; } = ["Characters", "Assets", "Locations"];
+    public List<int> CharacterIDs { get; set; } = [];
+    public List<int> AssetIDs { get; set; } = [];
+    public List<int> LocationIDs { get; set; } = [];
+    public string SceneRangeMode { get; set; } = "EntireProject";
+    public int? BookID { get; set; }
+    public int? ChapterID { get; set; }
+    public int? StartSceneID { get; set; }
+    public int? EndSceneID { get; set; }
+    public string DisplayMode { get; set; } = "StoryState";
+    public int? SelectedSceneID { get; set; }
+
+    public bool IncludeCharacters => EntityTypes.Contains("Characters", StringComparer.OrdinalIgnoreCase);
+    public bool IncludeAssets => EntityTypes.Contains("Assets", StringComparer.OrdinalIgnoreCase);
+    public bool IncludeLocations => EntityTypes.Contains("Locations", StringComparer.OrdinalIgnoreCase);
+}
+
+public sealed class ContinuityExplorerViewModel
+{
+    public Project Project { get; set; } = new();
+    public ContinuityFilter Filter { get; set; } = new();
+    public StoryStateViewModel StoryState { get; set; } = new();
+    public IReadOnlyList<CharacterJourneyViewModel> CharacterJourney { get; set; } = [];
+    public IReadOnlyList<AssetJourneyViewModel> AssetJourney { get; set; } = [];
+    public IReadOnlyList<LocationActivityViewModel> LocationActivity { get; set; } = [];
+    public IReadOnlyList<SelectListItem> BookOptions { get; set; } = [];
+    public IReadOnlyList<SelectListItem> ChapterOptions { get; set; } = [];
+    public IReadOnlyList<SelectListItem> SceneOptions { get; set; } = [];
+    public IReadOnlyList<SelectListItem> CharacterOptions { get; set; } = [];
+    public IReadOnlyList<SelectListItem> AssetOptions { get; set; } = [];
+    public IReadOnlyList<SelectListItem> LocationOptions { get; set; } = [];
+}
+
+public sealed class CharacterJourneyViewModel
+{
+    public int CharacterID { get; set; }
+    public string CharacterName { get; set; } = string.Empty;
+    public int SceneID { get; set; }
+    public string SceneLabel { get; set; } = string.Empty;
+    public string Location { get; set; } = string.Empty;
+}
+
+public sealed class AssetJourneyViewModel
+{
+    public int StoryAssetID { get; set; }
+    public string AssetName { get; set; } = string.Empty;
+    public int SceneID { get; set; }
+    public string SceneLabel { get; set; } = string.Empty;
+    public string HolderOrLocation { get; set; } = string.Empty;
+}
+
+public sealed class LocationActivityViewModel
+{
+    public int LocationID { get; set; }
+    public string LocationName { get; set; } = string.Empty;
+    public int SceneID { get; set; }
+    public string SceneLabel { get; set; } = string.Empty;
+    public string CharactersPresent { get; set; } = string.Empty;
+    public string AssetsPresent { get; set; } = string.Empty;
+}
+
 public sealed class SceneWorkflowEditViewModel
 {
     public int SceneID { get; set; }

PlotLine/Views/ContinuityExplorer/Index.cshtml

@@ -0,0 +1,300 @@
+@model ContinuityExplorerViewModel
+@{
+    ViewData["Title"] = $"Continuity Explorer - {Model.Project.ProjectName}";
+    ViewData["ProjectSection"] = "Continuity Explorer";
+}
+
+@functions {
+    private static string StateBadgeClass(string state) => state switch
+    {
+        "Explicit" => "bg-success",
+        "Inferred" => "bg-secondary",
+        _ => "bg-warning text-dark"
+    };
+
+    private bool IsEntitySelected(string entityType) =>
+        Model.Filter.EntityTypes.Contains(entityType, StringComparer.OrdinalIgnoreCase);
+}
+
+<nav class="breadcrumb-trail" aria-label="Breadcrumb">
+    <a asp-controller="Projects" asp-action="Index">Projects</a>
+    <a asp-controller="Projects" asp-action="Details" asp-route-id="@Model.Project.ProjectID">@Model.Project.ProjectName</a>
+    <span>Continuity Explorer</span>
+</nav>
+
+<partial name="_ProjectSectionNav" model="Model.Project" />
+
+<div class="page-heading">
+    <div>
+        <p class="eyebrow">Continuity</p>
+        <h1>Continuity Explorer</h1>
+        <p class="lead-text">Investigate where characters, assets, and locations stand across the story.</p>
+    </div>
+</div>
+
+<section class="card mb-3">
+    <div class="card-header d-flex justify-content-between align-items-center">
+        <strong>Filters</strong>
+        <button class="btn btn-outline-secondary btn-sm" type="button" data-bs-toggle="collapse" data-bs-target="#continuity-filter-panel" aria-expanded="true" aria-controls="continuity-filter-panel">Toggle</button>
+    </div>
+    <div class="collapse show" id="continuity-filter-panel">
+        <div class="card-body">
+            <form asp-action="ApplyFilters" method="post">
+                <input type="hidden" name="ProjectID" value="@Model.Project.ProjectID" />
+
+                <div class="row g-3">
+                    <div class="col-lg-3">
+                        <label class="form-label">Entity types</label>
+                        <div class="d-grid gap-1">
+                            <label class="form-check">
+                                <input class="form-check-input" type="checkbox" name="EntityTypes" value="Characters" checked="@IsEntitySelected("Characters")" />
+                                <span class="form-check-label">Characters</span>
+                            </label>
+                            <label class="form-check">
+                                <input class="form-check-input" type="checkbox" name="EntityTypes" value="Assets" checked="@IsEntitySelected("Assets")" />
+                                <span class="form-check-label">Assets</span>
+                            </label>
+                            <label class="form-check">
+                                <input class="form-check-input" type="checkbox" name="EntityTypes" value="Locations" checked="@IsEntitySelected("Locations")" />
+                                <span class="form-check-label">Locations</span>
+                            </label>
+                        </div>
+                    </div>
+
+                    <div class="col-lg-9">
+                        <div class="row g-2">
+                            <div class="col-md-4">
+                                <label class="form-label" for="CharacterIDs">Characters</label>
+                                <select class="form-select form-select-sm" id="CharacterIDs" name="CharacterIDs" asp-items="Model.CharacterOptions" multiple size="6"></select>
+                            </div>
+                            <div class="col-md-4">
+                                <label class="form-label" for="AssetIDs">Assets</label>
+                                <select class="form-select form-select-sm" id="AssetIDs" name="AssetIDs" asp-items="Model.AssetOptions" multiple size="6"></select>
+                            </div>
+                            <div class="col-md-4">
+                                <label class="form-label" for="LocationIDs">Locations</label>
+                                <select class="form-select form-select-sm" id="LocationIDs" name="LocationIDs" asp-items="Model.LocationOptions" multiple size="6"></select>
+                            </div>
+                        </div>
+                    </div>
+
+                    <div class="col-lg-4">
+                        <label class="form-label">Scene range</label>
+                        <div class="d-grid gap-1">
+                            <label class="form-check">
+                                <input class="form-check-input" type="radio" name="SceneRangeMode" value="EntireProject" checked="@(Model.Filter.SceneRangeMode == "EntireProject")" />
+                                <span class="form-check-label">Entire Project</span>
+                            </label>
+                            <label class="form-check">
+                                <input class="form-check-input" type="radio" name="SceneRangeMode" value="Book" checked="@(Model.Filter.SceneRangeMode == "Book")" />
+                                <span class="form-check-label">Book</span>
+                            </label>
+                            <label class="form-check">
+                                <input class="form-check-input" type="radio" name="SceneRangeMode" value="Chapter" checked="@(Model.Filter.SceneRangeMode == "Chapter")" />
+                                <span class="form-check-label">Chapter</span>
+                            </label>
+                            <label class="form-check">
+                                <input class="form-check-input" type="radio" name="SceneRangeMode" value="Custom" checked="@(Model.Filter.SceneRangeMode == "Custom")" />
+                                <span class="form-check-label">Custom Scene Range</span>
+                            </label>
+                        </div>
+                    </div>
+
+                    <div class="col-lg-8">
+                        <div class="row g-2">
+                            <div class="col-md-6">
+                                <label class="form-label" for="BookID">Book</label>
+                                <select class="form-select form-select-sm" id="BookID" name="BookID" asp-items="Model.BookOptions">
+                                    <option value="">Any book</option>
+                                </select>
+                            </div>
+                            <div class="col-md-6">
+                                <label class="form-label" for="ChapterID">Chapter</label>
+                                <select class="form-select form-select-sm" id="ChapterID" name="ChapterID" asp-items="Model.ChapterOptions">
+                                    <option value="">Any chapter</option>
+                                </select>
+                            </div>
+                            <div class="col-md-6">
+                                <label class="form-label" for="StartSceneID">Start scene</label>
+                                <select class="form-select form-select-sm" id="StartSceneID" name="StartSceneID" asp-items="Model.SceneOptions">
+                                    <option value="">First scene</option>
+                                </select>
+                            </div>
+                            <div class="col-md-6">
+                                <label class="form-label" for="EndSceneID">End scene</label>
+                                <select class="form-select form-select-sm" id="EndSceneID" name="EndSceneID" asp-items="Model.SceneOptions">
+                                    <option value="">Last scene</option>
+                                </select>
+                            </div>
+                        </div>
+                    </div>
+
+                    <div class="col-lg-4">
+                        <label class="form-label">Display mode</label>
+                        <div class="d-grid gap-1">
+                            <label class="form-check">
+                                <input class="form-check-input" type="radio" name="DisplayMode" value="StoryState" checked="@(Model.Filter.DisplayMode == "StoryState")" />
+                                <span class="form-check-label">Story State</span>
+                            </label>
+                            <label class="form-check">
+                                <input class="form-check-input" type="radio" name="DisplayMode" value="Journey" checked="@(Model.Filter.DisplayMode == "Journey")" />
+                                <span class="form-check-label">Journey</span>
+                            </label>
+                            <label class="form-check">
+                                <input class="form-check-input" type="radio" name="DisplayMode" value="LocationActivity" checked="@(Model.Filter.DisplayMode == "LocationActivity")" />
+                                <span class="form-check-label">Location Activity</span>
+                            </label>
+                        </div>
+                    </div>
+
+                    <div class="col-lg-8">
+                        <label class="form-label" for="SelectedSceneID">Story State scene</label>
+                        <select class="form-select form-select-sm" id="SelectedSceneID" name="SelectedSceneID" asp-items="Model.SceneOptions"></select>
+                    </div>
+                </div>
+
+                <div class="button-row mt-3">
+                    <button class="btn btn-primary" type="submit">Apply filters</button>
+                    <a class="btn btn-outline-secondary" asp-action="Index" asp-route-projectId="@Model.Project.ProjectID">Reset</a>
+                </div>
+            </form>
+        </div>
+    </div>
+</section>
+
+@if (Model.Filter.DisplayMode == "StoryState")
+{
+    <section class="story-bible-section">
+        <h2>Story State</h2>
+        @if (!Model.StoryState.Characters.Any() && !Model.StoryState.Assets.Any() && !Model.StoryState.Locations.Any())
+        {
+            <p class="muted">No matching continuity information found.</p>
+        }
+        else
+        {
+            @if (Model.Filter.IncludeCharacters)
+            {
+                <h3>Characters</h3>
+                <div class="table-responsive mb-3">
+                    <table class="table table-sm align-middle">
+                        <thead><tr><th>Character</th><th>Current Location</th><th>State</th><th>Last Confirmed</th></tr></thead>
+                        <tbody>
+                            @foreach (var row in Model.StoryState.Characters)
+                            {
+                                <tr><td>@row.CharacterName</td><td>@row.CurrentLocation</td><td><span class="badge @StateBadgeClass(row.State)">@row.State</span></td><td>@row.LastConfirmed</td></tr>
+                            }
+                        </tbody>
+                    </table>
+                </div>
+            }
+
+            @if (Model.Filter.IncludeAssets)
+            {
+                <h3>Assets</h3>
+                <div class="table-responsive mb-3">
+                    <table class="table table-sm align-middle">
+                        <thead><tr><th>Asset</th><th>Holder / Location</th><th>State</th><th>Last Confirmed</th></tr></thead>
+                        <tbody>
+                            @foreach (var row in Model.StoryState.Assets)
+                            {
+                                <tr><td>@row.AssetName</td><td>@row.CurrentHolderOrLocation</td><td><span class="badge @StateBadgeClass(row.State)">@row.State</span></td><td>@row.LastConfirmed</td></tr>
+                            }
+                        </tbody>
+                    </table>
+                </div>
+            }
+
+            @if (Model.Filter.IncludeLocations)
+            {
+                <h3>Locations</h3>
+                @if (!Model.StoryState.Locations.Any())
+                {
+                    <p class="muted">No matching location presence found.</p>
+                }
+                else
+                {
+                    <div class="row g-3">
+                        @foreach (var location in Model.StoryState.Locations)
+                        {
+                            <div class="col-lg-6">
+                                <article class="story-bible-card h-100">
+                                    <h3>@location.LocationPath</h3>
+                                    <p><strong>Characters:</strong> @(location.CharactersPresent.Any() ? string.Join(", ", location.CharactersPresent) : "None")</p>
+                                    <p><strong>Assets:</strong> @(location.AssetsPresent.Any() ? string.Join(", ", location.AssetsPresent) : "None")</p>
+                                </article>
+                            </div>
+                        }
+                    </div>
+                }
+            }
+        }
+    </section>
+}
+else if (Model.Filter.DisplayMode == "Journey")
+{
+    <section class="story-bible-section">
+        <h2>Journey</h2>
+        @if (!Model.CharacterJourney.Any() && !Model.AssetJourney.Any())
+        {
+            <p class="muted">No movement recorded.</p>
+        }
+        else
+        {
+            @foreach (var group in Model.CharacterJourney.GroupBy(x => new { x.CharacterID, x.CharacterName }))
+            {
+                <h3>@group.Key.CharacterName</h3>
+                <div class="table-responsive mb-3">
+                    <table class="table table-sm align-middle">
+                        <thead><tr><th>Scene</th><th>Location</th></tr></thead>
+                        <tbody>
+                            @foreach (var row in group)
+                            {
+                                <tr><td>@row.SceneLabel</td><td>@row.Location</td></tr>
+                            }
+                        </tbody>
+                    </table>
+                </div>
+            }
+
+            @foreach (var group in Model.AssetJourney.GroupBy(x => new { x.StoryAssetID, x.AssetName }))
+            {
+                <h3>@group.Key.AssetName</h3>
+                <div class="table-responsive mb-3">
+                    <table class="table table-sm align-middle">
+                        <thead><tr><th>Scene</th><th>Holder / Location</th></tr></thead>
+                        <tbody>
+                            @foreach (var row in group)
+                            {
+                                <tr><td>@row.SceneLabel</td><td>@row.HolderOrLocation</td></tr>
+                            }
+                        </tbody>
+                    </table>
+                </div>
+            }
+        }
+    </section>
+}
+else
+{
+    <section class="story-bible-section">
+        <h2>Location Activity</h2>
+        @if (!Model.LocationActivity.Any())
+        {
+            <p class="muted">No matching continuity information found.</p>
+        }
+        else
+        {
+            <div class="table-responsive">
+                <table class="table table-sm align-middle">
+                    <thead><tr><th>Location</th><th>Scene</th><th>Characters Present</th><th>Assets Present</th></tr></thead>
+                    <tbody>
+                        @foreach (var row in Model.LocationActivity)
+                        {
+                            <tr><td>@row.LocationName</td><td>@row.SceneLabel</td><td>@row.CharactersPresent</td><td>@row.AssetsPresent</td></tr>
+                        }
+                    </tbody>
+                </table>
+            </div>
+        }
+    </section>
+}

PlotLine/Views/Shared/_ProjectSectionNav.cshtml

@@ -20,6 +20,7 @@
         <a class="pw-project-nav__link @(ActiveClass("Metrics"))" asp-controller="ProjectMetrics" asp-action="Index" asp-route-projectId="@projectId">Metrics</a>
         <a class="pw-project-nav__link @(ActiveClass("Scenarios"))" asp-controller="Scenarios" asp-action="Index" asp-route-projectId="@projectId">Scenarios</a>
         <a class="pw-project-nav__link @(ActiveClass("Story Bible"))" asp-controller="StoryBible" asp-action="Index" asp-route-projectId="@projectId">Story Bible</a>
+        <a class="pw-project-nav__link @(ActiveClass("Continuity Explorer"))" asp-controller="ContinuityExplorer" asp-action="Index" asp-route-projectId="@projectId">Continuity Explorer</a>
         <a class="pw-project-nav__link @(ActiveClass("Health"))" asp-controller="Analytics" asp-action="Index" asp-route-projectId="@projectId">Health</a>
         <a class="pw-project-nav__link @(ActiveClass("Warnings"))" asp-controller="Warnings" asp-action="Index" asp-route-projectId="@projectId">Warnings</a>
         <a class="pw-project-nav__link @(ActiveClass("Archive"))" asp-controller="Archives" asp-action="Index" asp-route-projectId="@projectId">Archive</a>