Added basic search engine functionality

1 files changed, 36 insertions, 0 deletions

diff --git a/Services/SearchService.cs b/Services/SearchService.cs
new file mode 100644
index 0000000..681c08d
--- /dev/null
+++ b/Services/SearchService.cs
@@ -0,0 +1,36 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace HyperBooru.Services;
+
+public interface ISearchService {
+    public Media[] Search(string query);
+}
+
+public class SearchService : ISearchService {
+    private IDbContextFactory<HBContext> dbFactory;
+
+    public SearchService(IDbContextFactory<HBContext> dbFactory) =>
+        this.dbFactory = dbFactory;
+
+    public Media[] Search(string query) {
+        var db = dbFactory.CreateDbContext();
+
+        query = query.ToLower();
+
+        var matchedTag = db.TagDefinitions
+            .FirstOrDefault(td => td.Name.ToLower() == query)?.Guid;
+        if(matchedTag is not null)
+            return db.Media
+                .Where(m => m.Tags
+                    .Select(t => t.TagDefinition)
+                    .Select(td => td.Guid)
+                    .Contains((Guid) matchedTag))
+                .ToArray();
+
+        var matchingTags = db.TagDefinitions
+            .Where(td => td.Name.ToLower().Contains(query))
+            .Select(td => td.Guid);
+
+        throw new NotImplementedException();
+    }
+}