Adding Flags API

src/api/MicCheck.Api/Environments/EnvironmentDocumentService.cs

@@ -0,0 +1,54 @@
+using MicCheck.Api.Data;
+using MicCheck.Api.Features;
+using Microsoft.EntityFrameworkCore;
+using AppEnvironment = MicCheck.Api.Environments.Environment;
+
+namespace MicCheck.Api.Environments;
+
+public class EnvironmentDocumentService(MicCheckDbContext db)
+{
+    public async Task<EnvironmentDocumentResponse?> GetAsync(int environmentId, CancellationToken ct = default)
+    {
+        var environment = await db.Environments
+            .FindAsync([environmentId], ct);
+
+        if (environment is null)
+            return null;
+
+        var featureStateResults = await (
+            from fs in db.FeatureStates
+            join f in db.Features on fs.FeatureId equals f.Id
+            where fs.EnvironmentId == environmentId
+               && fs.IdentityId == null
+               && fs.FeatureSegmentId == null
+            select new FeatureStateResult
+            {
+                Feature = f,
+                Enabled = fs.Enabled,
+                Value = fs.Value
+            }
+        ).ToListAsync(ct);
+
+        var project = await db.Projects
+            .Include(p => p.Segments)
+                .ThenInclude(s => s.Rules)
+                    .ThenInclude(r => r.Conditions)
+            .Include(p => p.Segments)
+                .ThenInclude(s => s.Rules)
+                    .ThenInclude(r => r.ChildRules)
+                        .ThenInclude(cr => cr.Conditions)
+            .FirstOrDefaultAsync(p => p.Id == environment.ProjectId, ct);
+
+        if (project is null)
+            return null;
+
+        return new EnvironmentDocumentResponse(
+            environment.Id,
+            environment.ApiKey,
+            featureStateResults.Select(FlagResponse.From).ToList(),
+            new EnvironmentProjectResponse(
+                project.Id,
+                project.Name,
+                project.Segments.Select(SegmentDocumentResponse.From).ToList()));
+    }
+}