Added links (#406)

Added links into the plot.
When clicking on the plot on the main page a redirect is implemente the
the matching detailpage.

src/aki_prj23_transparenzregister/ui/pages/home.py

@@ -1,4 +1,5 @@
 """Content of home page."""
+import os
 from functools import lru_cache
 
 import dash
@@ -10,6 +11,7 @@ from cachetools import TTLCache, cached
 from dash import Input, Output, callback, dash_table, dcc, html
 from loguru import logger
 
+from aki_prj23_transparenzregister.ui.session_handler import SessionHandler
 from aki_prj23_transparenzregister.utils.networkx.network_2d import (
     create_2d_graph,
 )
@@ -26,6 +28,7 @@ from aki_prj23_transparenzregister.utils.networkx.networkx_data import (
     get_all_company_relations,
     get_all_person_relations,
 )
+from aki_prj23_transparenzregister.utils.sql import entities
 
 dash.register_page(
     __name__,
@@ -363,6 +366,39 @@ def update_graph_data(
     return graph, metrics, nodes_tmp, edges_tmp
 
 
+@callback(Output("url", "href"), [Input("my-graph", "clickData")])
+def redirect(click_data: dict) -> str:
+    """Redirects on clicking on an entity to that entity."""
+    if not click_data:
+        return dash.no_update
+    logger.debug(click_data)
+    db = SessionHandler.session
+    if not db:
+        raise ValueError("No SQL session defined.")
+    home_path = os.getenv("DASH_URL_BASE_PATHNAME", "")
+    id = (
+        db.query(entities.Company.id)
+        .filter(entities.Company.name == click_data["points"][0]["text"])
+        .first()
+    )
+    if id:
+        url = f"{home_path}/unternehmensdetails/{id[0]}"
+        logger.info("Redirecting to detail page: url")
+        return url
+    concatenated_name = entities.Person.firstname + " " + entities.Person.lastname
+    id = (
+        db.query(entities.Person.id)
+        .filter(concatenated_name == click_data["points"][0]["text"])
+        .first()
+    )
+    if id:
+        url = f"{home_path}/personendetails/{id[0]}"
+        logger.info("Redirecting to detail page: url")
+        return url
+    return dash.no_update
+    # Prevent update if no data point was clicked
+
+
 @callback(
     [
         Output("metric_table", "data"),

tests/ui/home_page_test.py

@@ -1,8 +1,10 @@
 """Test for the Home Page."""
 import datetime
 from collections.abc import Generator
+from typing import Any
 from unittest.mock import patch
 
+import dash
 import pandas as pd
 import pytest
 from sqlalchemy.orm import Session
@@ -205,3 +207,33 @@ def _set_session(full_db: Session) -> Generator[None, None, None]:
 def test_layout() -> None:
     """Checks if layout can be executed."""
     home.layout()
+
+
+@pytest.mark.usefixtures("_set_session")
+@pytest.mark.parametrize("empty", ["", None, {}])
+def test_redirect_empty(empty: Any) -> None:
+    """Tests the redirection on clicking on the plot with an empty argument."""
+    assert home.redirect(empty) == dash.no_update  # type: ignore
+
+
+def test_redirect_content_without_db() -> None:
+    """Tests the error when no SQL session is defined."""
+    with pytest.raises(ValueError, match="No SQL session defined."):
+        assert home.redirect({"empty": ""})
+
+
+@pytest.mark.usefixtures("_set_session")
+@pytest.mark.parametrize(
+    ("click_on", "redirect_to"),
+    [
+        (
+            {"text": "Some Company GmbH"},
+            "/unternehmensdetails/1",
+        ),
+        ({"text": "Max Mustermann"}, "/personendetails/1"),
+        ({"text": "I do not exist"}, dash.no_update),
+    ],
+)
+def test_redirect(click_on: dict, redirect_to: Any) -> None:
+    """Tests the redirection when clicking on a plot."""
+    assert home.redirect({"points": [click_on]}) == redirect_to