feat(stats): optimize dashboard data loading with internal ui endpoints

tests/test_api_stats.py

@@ -55,10 +55,10 @@ def test_stats_returns_html_page_for_empty_board(tmp_path):
     assert "Backlog" in response.text
     assert "In Progress" in response.text
     assert "Done" in response.text
-    assert response.text.count("No tasks") == 3
+    assert response.text.count("Loading tasks...") == 3
 
 
-def test_stats_renders_tasks_in_all_kanban_columns(tmp_path):
+def test_stats_includes_client_side_board_loading_hooks(tmp_path):
     client, repo = make_client(tmp_path)
     backlog = make_task(title="Backlog title", started=False, done=False)
     in_progress = make_task(title="In progress title", started=True, done=False)
@@ -70,15 +70,16 @@ def test_stats_renders_tasks_in_all_kanban_columns(tmp_path):
     response = client.get("/stats")
 
     assert response.status_code == 200
-    assert "Backlog title" in response.text
-    assert "In progress title" in response.text
-    assert "Done title" in response.text
     assert "Backlog" in response.text
     assert "In Progress" in response.text
     assert "Done" in response.text
+    assert 'id="backlog-list"' in response.text
+    assert 'id="in-progress-list"' in response.text
+    assert 'id="done-list"' in response.text
+    assert 'fetch("/ui_data/stats/board")' in response.text
 
 
-def test_stats_preselects_first_task_in_details_block(tmp_path):
+def test_stats_renders_empty_details_block_until_client_side_fetch(tmp_path):
     client, repo = make_client(tmp_path)
     first = make_task(title="First task", started=False, done=False)
     second = make_task(title="Second task", started=True, done=False)
@@ -90,8 +91,8 @@ def test_stats_preselects_first_task_in_details_block(tmp_path):
     assert response.status_code == 200
     assert 'id="selected-title"' in response.text
     assert 'id="selected-created-at"' in response.text
-    assert "First task" in response.text
-    assert first.created_at.isoformat() in response.text
+    assert "No task selected" in response.text
+    assert first.created_at.isoformat() not in response.text
 
 
 def test_stats_shows_placeholders_for_missing_dates(tmp_path):
@@ -117,11 +118,11 @@ def test_stats_renders_cycle_time_for_completed_task(tmp_path):
 
     assert response.status_code == 200
     assert 'id="selected-cycle-time"' in response.text
-    assert "0h 9m" in response.text
-    assert ">—<" not in response.text.split('id="selected-cycle-time"', 1)[1].split("</div>", 2)[1]
+    assert "0h 9m" not in response.text
+    assert ">—<" in response.text
 
 
-def test_stats_embeds_task_payload_for_client_side_switching(tmp_path):
+def test_stats_does_not_embed_task_payload_for_client_side_switching(tmp_path):
     client, repo = make_client(tmp_path)
     task = make_task(title="Payload task", started=True, done=True)
     repo.create_task(task)
@@ -129,14 +130,9 @@ def test_stats_embeds_task_payload_for_client_side_switching(tmp_path):
     response = client.get("/stats")
 
     assert response.status_code == 200
-    assert "data-task='" in response.text
-    assert str(task.id) in response.text
-    assert '"title": "Payload task"' in response.text
-    assert '"status": "done"' in response.text
-    assert '"created_at":' in response.text
-    assert '"started_at":' in response.text
-    assert '"done_at":' in response.text
-    assert '"cycle_time":' in response.text
+    assert "data-task='" not in response.text
+    assert str(task.id) not in response.text
+    assert "Payload task" not in response.text
 
 
 def test_stats_includes_js_hooks_for_dynamic_selected_task_update(tmp_path):
@@ -154,7 +150,7 @@ def test_stats_includes_js_hooks_for_dynamic_selected_task_update(tmp_path):
     assert 'id="selected-created-at"' in response.text
     assert 'document.querySelectorAll(".task-card")' in response.text
     assert 'card.addEventListener("click"' in response.text
-    assert "JSON.parse(card.dataset.task)" in response.text
+    assert "fetch(`/ui_data/tasks/${taskId}`)" in response.text
 
 
 def test_stats_handles_utf8_titles(tmp_path):
@@ -164,7 +160,7 @@ def test_stats_handles_utf8_titles(tmp_path):
     response = client.get("/stats")
 
     assert response.status_code == 200
-    assert "Задача пример" in response.text
+    assert "Задача пример" not in response.text
 
 
 def test_stats_escapes_html_in_task_title(tmp_path):
@@ -175,7 +171,7 @@ def test_stats_escapes_html_in_task_title(tmp_path):
 
     assert response.status_code == 200
     assert "<script>alert(1)</script>" not in response.text
-    assert "&lt;script&gt;alert(1)&lt;/script&gt;" in response.text
+    assert "&lt;script&gt;alert(1)&lt;/script&gt;" not in response.text
 
 
 def test_stats_rejects_unsupported_method(tmp_path):
@@ -202,7 +198,7 @@ def test_stats_still_works_after_recovery_from_corrupted_file(tmp_path):
     assert "No task selected" in response.text
 
 
-def test_stats_renders_created_started_and_done_values_for_completed_task(tmp_path):
+def test_stats_does_not_render_created_started_and_done_values_server_side(tmp_path):
     client, repo = make_client(tmp_path)
     task = make_task(title="Detailed task", started=True, done=True)
     repo.create_task(task)
@@ -210,7 +206,6 @@ def test_stats_renders_created_started_and_done_values_for_completed_task(tmp_pa
     response = client.get("/stats")
 
     assert response.status_code == 200
-    assert task.created_at.isoformat() in response.text
-    assert task.started_at.isoformat() in response.text
-    assert task.done_at.isoformat() in response.text
-
+    assert task.created_at.isoformat() not in response.text
+    assert task.started_at.isoformat() not in response.text
+    assert task.done_at.isoformat() not in response.text

tests/test_api_ui_data.py

@@ -0,0 +1,121 @@
+from __future__ import annotations
+
+from datetime import UTC, datetime, timedelta
+from uuid import uuid4
+
+from fastapi.testclient import TestClient
+
+from app.api.tasks import get_task_repository
+from app.main import app
+from app.storage import JsonFileTaskRepository, StoredTask
+
+
+def make_repo(tmp_path) -> JsonFileTaskRepository:
+    return JsonFileTaskRepository(tmp_path / "tasks.json")
+
+
+def make_task(
+    *,
+    title: str = "Task",
+    started: bool = False,
+    done: bool = False,
+) -> StoredTask:
+    now = datetime.now(UTC)
+    started_at = now - timedelta(minutes=10) if started else None
+    done_at = now - timedelta(minutes=1) if done else None
+    return StoredTask(
+        id=uuid4(),
+        title=title,
+        created_at=now - timedelta(hours=1),
+        started_at=started_at,
+        done_at=done_at,
+    )
+
+
+def make_client(tmp_path) -> tuple[TestClient, JsonFileTaskRepository]:
+    repo = make_repo(tmp_path)
+    app.dependency_overrides[get_task_repository] = lambda: repo
+    client = TestClient(app)
+    return client, repo
+
+
+def teardown_function() -> None:
+    app.dependency_overrides.clear()
+
+
+def test_ui_data_board_returns_lightweight_grouped_lists(tmp_path):
+    client, repo = make_client(tmp_path)
+    backlog = make_task(title="Backlog title")
+    in_progress = make_task(title="In progress title", started=True)
+    done = make_task(title="Done title", started=True, done=True)
+    repo.create_task(backlog)
+    repo.create_task(in_progress)
+    repo.create_task(done)
+
+    response = client.get("/ui_data/stats/board")
+
+    assert response.status_code == 200
+    data = response.json()
+    assert [item["title"] for item in data["backlog_tasks"]] == ["Backlog title"]
+    assert [item["title"] for item in data["in_progress_tasks"]] == ["In progress title"]
+    assert [item["title"] for item in data["done_tasks"]] == ["Done title"]
+    assert data["backlog_tasks"][0]["display_date_label"] == "Created"
+    assert data["in_progress_tasks"][0]["display_date_label"] == "Started"
+    assert data["done_tasks"][0]["display_date_label"] == "Done"
+    assert "created_at" not in data["backlog_tasks"][0]
+    assert "started_at" not in data["in_progress_tasks"][0]
+    assert "done_at" not in data["done_tasks"][0]
+    assert "cycle_time" not in data["done_tasks"][0]
+
+
+def test_ui_data_task_details_returns_full_selected_task_data(tmp_path):
+    client, repo = make_client(tmp_path)
+    task = make_task(title="Detailed task", started=True, done=True)
+    repo.create_task(task)
+
+    response = client.get(f"/ui_data/tasks/{task.id}")
+
+    assert response.status_code == 200
+    data = response.json()
+    assert data["id"] == str(task.id)
+    assert data["title"] == "Detailed task"
+    assert data["status"] == "done"
+    assert datetime.fromisoformat(data["created_at"].replace("Z", "+00:00")) == task.created_at
+    assert datetime.fromisoformat(data["started_at"].replace("Z", "+00:00")) == task.started_at
+    assert datetime.fromisoformat(data["done_at"].replace("Z", "+00:00")) == task.done_at
+    assert data["cycle_time"].startswith("0h 9m")
+
+
+def test_ui_data_task_details_rejects_invalid_uuid(tmp_path):
+    client, _repo = make_client(tmp_path)
+
+    response = client.get("/ui_data/tasks/bad-id")
+
+    assert response.status_code == 400
+    assert response.json() == {
+        "error": "invalid_id",
+        "message": "Task id must be a valid UUID",
+    }
+
+
+def test_ui_data_task_details_returns_not_found_for_missing_task(tmp_path):
+    client, _repo = make_client(tmp_path)
+
+    response = client.get(f"/ui_data/tasks/{uuid4()}")
+
+    assert response.status_code == 404
+    assert response.json() == {
+        "error": "invalid_id",
+        "message": "Task was not found",
+    }
+
+
+def test_ui_data_routes_are_hidden_from_openapi_schema(tmp_path):
+    client, _repo = make_client(tmp_path)
+
+    response = client.get("/openapi.json")
+
+    assert response.status_code == 200
+    paths = response.json()["paths"]
+    assert "/ui_data/stats/board" not in paths
+    assert "/ui_data/tasks/{task_id}" not in paths