From ff715df3ccda51c1bb3d4b84f4391b4fdd1962dd Mon Sep 17 00:00:00 2001
From: Jake Mannens <jake@asger.xyz>
Date: Tue, 22 Aug 2023 10:00:21 +1000
Subject: Finalised initial implementation of NSFW tag filtering

---
 Services/TagService.cs       | 79 +++++++++++++++++++++++++++++++++++++++-----
 Services/UserStateService.cs | 21 ++++++++++++
 2 files changed, 91 insertions(+), 9 deletions(-)
 create mode 100644 Services/UserStateService.cs

(limited to 'Services')

diff --git a/Services/TagService.cs b/Services/TagService.cs
index 8de52ff..860103b 100644
--- a/Services/TagService.cs
+++ b/Services/TagService.cs
@@ -14,12 +14,18 @@ public interface ITagService {
     public void RemoveTag(HBObject obj, TagDefinition tagDef);
     public void SetImplicitTags(TagDefinition tagDef, TagDefinition[] implicitTagDefs);
     public void SetImplicitTags(Guid tagDef, Guid[] implicitTagDefs);
+    public void AddImplicitTag(Guid tagDef, Guid implicitTagDef);
+    public void AddImplicitTag(TagDefinition tagDef, TagDefinition implicitTagDef);
+    public void RemoveImplicitTag(Guid tagDef, Guid implicitTagDef);
+    public void RemoveImplicitTag(TagDefinition tagDef, TagDefinition implicitTagDef);
     public void CreateTagDefinition(string name, string? @namespace);
+    public void DeleteTagDefinition(Guid tagDef);
     public void DeleteTagDefinition(TagDefinition tagDef);
     public void UpdateTagDefinition(Guid tagDef, string name, string? @namespace);
     public void UpdateTagDefinition(TagDefinition tagDef, string name, string? @namespace);
     public (TagDefinition tagDefinition, bool isImplicit)[] GetAllTags(Guid obj);
     public (TagDefinition tagDefinition, bool isImplicit)[] GetAllTags(HBObject obj);
+    public (TagDefinition tagDefinition, bool isImplicit)[] GetAllTags(TagDefinition tagDef);
 }
 
 public class TagService : ITagService {
@@ -78,6 +84,31 @@ public class TagService : ITagService {
     public void SetImplicitTags(TagDefinition tagDef, TagDefinition[] implicitTagDefs) =>
         SetImplicitTags(tagDef.Guid, implicitTagDefs.Select(td => td.Guid).ToArray());
 
+    public void AddImplicitTag(Guid tagDef, Guid implicitTagDef) {
+        using var db = dbFactory.CreateDbContext();
+
+        var tag = db.TagDefinitions.First(td => td.Guid == tagDef);
+        var implicitTag = db.TagDefinitions.First(td => td.Guid == implicitTagDef);
+
+        tag.ImplicitTags.Add(implicitTag);
+        db.SaveChanges();
+    }
+
+    public void AddImplicitTag(TagDefinition tagDef, TagDefinition implicitTagDef) =>
+        AddImplicitTag(tagDef, implicitTagDef);
+
+    public void RemoveImplicitTag(Guid tagDef, Guid implicitTagDef) {
+        using var db = dbFactory.CreateDbContext();
+
+        var tag = db.TagDefinitions.First(td => td.Guid == tagDef);
+
+        tag.ImplicitTags.RemoveAll(td => td.Guid == implicitTagDef);
+        db.SaveChanges();
+    }
+
+    public void RemoveImplicitTag(TagDefinition tagDef, TagDefinition implicitTagDef) =>
+        RemoveImplicitTag(tagDef, implicitTagDef);
+
     public void CreateTagDefinition(string name, string? @namespace) {
         using var db = dbFactory.CreateDbContext();
 
@@ -91,20 +122,24 @@ public class TagService : ITagService {
         db.SaveChanges();
     }
 
-    public void DeleteTagDefinition(TagDefinition tagDef) {
+    public void DeleteTagDefinition(Guid tagDef) {
         using var db = dbFactory.CreateDbContext();
-        db.Entry(tagDef).State = EntityState.Unchanged;
+
+        var tag = db.TagDefinitions.First(td => td.Guid == tagDef);
 
         using var transaction = db.Database.BeginTransaction();
 
         db.Tags.RemoveRange(
-            db.Tags.Where(t => t.TagDefinition == tagDef));
-        db.TagDefinitions.Remove(tagDef);
+            db.Tags.Where(t => t.TagDefinition.Guid == tagDef));
+        db.TagDefinitions.Remove(tag);
         db.SaveChanges();
 
         transaction.Commit();
     }
 
+    public void DeleteTagDefinition(TagDefinition tagDef) =>
+        DeleteTagDefinition(tagDef.Guid);
+
     public void UpdateTagDefinition(Guid tagDef, string name, string? @namespace) {
         using var db = dbFactory.CreateDbContext();
 
@@ -122,11 +157,6 @@ public class TagService : ITagService {
         UpdateTagDefinition(tagDef.Guid, name, @namespace);
 
     public (TagDefinition tagDefinition, bool isImplicit)[] GetAllTags(Guid obj) {
-        IEnumerable<TagDefinition> GetTagRecursive(IEnumerable<TagDefinition> tagDefs) =>
-            tagDefs
-                .Concat(tagDefs.SelectMany(td => GetTagRecursive(td.ImplicitTags)))
-                .DistinctBy(td => td.Guid);
-
         using var db = dbFactory.CreateDbContext();
         var @object = db.Objects.First(o => o.Guid == obj);
 
@@ -139,4 +169,35 @@ public class TagService : ITagService {
 
     public (TagDefinition tagDefinition, bool isImplicit)[] GetAllTags(HBObject obj) =>
         GetAllTags(obj.Guid);
+
+    public (TagDefinition tagDefinition, bool isImplicit)[] GetAllTags(TagDefinition tagDef) {
+        using var db = dbFactory.CreateDbContext();
+
+        var tag = db.TagDefinitions.First(td => td.Guid == tagDef.Guid);
+
+        return GetTagRecursive(tag.ImplicitTags)
+            .Select(td => new ValueTuple<TagDefinition, bool>(td, !tag.ImplicitTags.Select(it => it.Guid).Contains(td.Guid)))
+            .ToArray();
+    }
+
+    private List<TagDefinition> GetTagRecursive(IEnumerable<TagDefinition> tagDefs) {
+        var tags = new List<TagDefinition>(tagDefs);
+
+        List<TagDefinition>? toProcessNext = null;
+
+        while(true) {
+            toProcessNext = (toProcessNext ?? tags)
+                .SelectMany(td => td.ImplicitTags)
+                .Where(td => !tags.Select(td => td.Guid).Contains(td.Guid))
+                .DistinctBy(td => td.Guid)
+                .ToList();
+
+            tags.AddRange(toProcessNext);
+
+            if(toProcessNext.Count() == 0)
+                break;
+        }
+
+        return tags;
+    }
 }
diff --git a/Services/UserStateService.cs b/Services/UserStateService.cs
new file mode 100644
index 0000000..dc742e1
--- /dev/null
+++ b/Services/UserStateService.cs
@@ -0,0 +1,21 @@
+namespace HyperBooru.Services;
+
+public interface IUserStateService {
+    public bool ShowNsfw { get; set; }
+
+    public event EventHandler<bool> ShowNsfwChanged;
+}
+
+public class UserStateService : IUserStateService {
+    public bool ShowNsfw {
+        get => showNsfw;
+        set {
+            showNsfw = value;
+            ShowNsfwChanged?.Invoke(this, value);
+        }
+    }
+
+    public event EventHandler<bool> ShowNsfwChanged;
+
+    private bool showNsfw = false;
+}
-- 
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