"""RED-Test für BUG-04: Verifiziert dass die echte admin.py /api/layout/add
   Route die bestehende pack()-Semantik aufruft (also BUG bestätigt).

Verwendet Flask test_client, kein Live-Server.
"""
import sys, os, json, tempfile
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

# admin.py benutzt dashboard_mod.load_config etc. — wir mocken das minimal.
import unittest
from unittest.mock import patch, MagicMock


def make_admin_app():
    """Importiert admin mit gemockten dashboard-Funktionen. Singleton — beim
    zweiten Aufruf wird der bestehende Mock wiederverwendet, damit Tests sich
    gegenseitig konfigurieren können."""
    import importlib
    import types

    # bestehender Mock? dann wiederverwenden
    existing = sys.modules.get("dashboard")
    if existing is None:
        fake_dashboard = types.ModuleType("dashboard")
        fake_dashboard.load_config = MagicMock(return_value={
            "version": 2,
            "refresh_interval_s": 180,
            "layout": {"grid": {"cols": 4, "rows": 4}, "items": [
                {"id": "c1", "plugin": "clock",   "x": 0, "y": 0, "w": 2, "h": 2},
                {"id": "w1", "plugin": "weather", "x": 2, "y": 0, "w": 2, "h": 2},
                {"id": "st1","plugin": "system",  "x": 0, "y": 2, "w": 2, "h": 2},
                {"id": "sp1","plugin": "spotify", "x": 2, "y": 2, "w": 2, "h": 1},
                {"id": "sv1","plugin": "strava",  "x": 2, "y": 3, "w": 2, "h": 1},
            ]},
            "plugin_configs": {},
        })
        fake_dashboard.save_config = MagicMock()
        fake_dashboard.get_widget_classes = MagicMock(return_value={"hello": MagicMock()})
        sys.modules["dashboard"] = fake_dashboard
    else:
        fake_dashboard = existing

    admin = importlib.import_module("admin")
    admin.app.config["TESTING"] = True
    admin.require_auth = lambda: None
    return admin, fake_dashboard


class TestAddRouteDoesNotRepack(unittest.TestCase):
    def setUp(self):
        # Reset Mock-Return auf den Default vor jedem Test
        admin, fake = make_admin_app()
        self._default_cfg = {
            "version": 2,
            "refresh_interval_s": 180,
            "layout": {"grid": {"cols": 4, "rows": 4}, "items": [
                {"id": "c1", "plugin": "clock",   "x": 0, "y": 0, "w": 2, "h": 2},
                {"id": "w1", "plugin": "weather", "x": 2, "y": 0, "w": 2, "h": 2},
                {"id": "st1","plugin": "system",  "x": 0, "y": 2, "w": 2, "h": 2},
                {"id": "sp1","plugin": "spotify", "x": 2, "y": 2, "w": 2, "h": 1},
                {"id": "sv1","plugin": "strava",  "x": 2, "y": 3, "w": 2, "h": 1},
            ]},
            "plugin_configs": {},
        }
        fake.load_config.return_value = self._default_cfg
        fake.save_config.reset_mock()
        self.admin, self.fake = admin, fake
        self.client = admin.app.test_client()

    def test_add_1x1_into_gap_does_not_move_existing(self):
        """Bestehende config mit Lücke bei (2,3),(3,3). Add hello (1x1) soll
        auf (2,3) gehen (erste scan-line freie Zelle) — alle anderen UNVERÄNDERT."""
        self.fake.load_config.return_value = {
            "version": 2,
            "refresh_interval_s": 180,
            "layout": {"grid": {"cols": 4, "rows": 4}, "items": [
                {"id": "c1", "plugin": "clock",   "x": 0, "y": 0, "w": 2, "h": 2},
                {"id": "w1", "plugin": "weather", "x": 2, "y": 0, "w": 2, "h": 2},
                {"id": "st1","plugin": "system",  "x": 0, "y": 2, "w": 2, "h": 2},
                {"id": "sp1","plugin": "spotify", "x": 2, "y": 2, "w": 1, "h": 1},
                {"id": "sv1","plugin": "strava",  "x": 3, "y": 2, "w": 1, "h": 1},
            ]},
            "plugin_configs": {},
        }

        r = self.client.post("/api/layout/add", data={"plugin": "hello"})
        self.assertEqual(r.status_code, 200, r.get_data(as_text=True))
        j = r.get_json()
        self.assertTrue(j["ok"], j)
        items = j["items"]
        by_id = {it["id"]: it for it in items}
        # Existierende UNVERÄNDERT
        self.assertEqual((by_id["c1"]["x"],  by_id["c1"]["y"]),  (0, 0), "clock moved!")
        self.assertEqual((by_id["w1"]["x"],  by_id["w1"]["y"]),  (2, 0), "weather moved!")
        self.assertEqual((by_id["st1"]["x"], by_id["st1"]["y"]), (0, 2), "system moved!")
        self.assertEqual((by_id["sp1"]["x"], by_id["sp1"]["y"]), (2, 2), "spotify moved!")
        self.assertEqual((by_id["sv1"]["x"], by_id["sv1"]["y"]), (3, 2), "strava moved!")
        # Neues hello auf (2,3) — erste scan-line freie Zelle
        new_items = [it for it in items if it["plugin"] == "hello" and it["id"] not in ("c1","w1","st1","sp1","sv1")]
        self.assertEqual(len(new_items), 1, f"expected exactly 1 new hello, got {new_items}")
        new = new_items[0]
        self.assertEqual((new["x"], new["y"]), (2, 3),
                         f"expected new hello at (2,3), got ({new['x']},{new['y']}); full: {items}")

    def test_add_to_full_grid_returns_409(self):
        """Wenn kein Platz: 409, keine bestehenden Items verändert."""
        self.fake.load_config.return_value["layout"]["items"] = [
            {"id": f"f{i}", "plugin": "x", "x": (i % 4), "y": (i // 4),
             "w": 1, "h": 1} for i in range(16)
        ]
        before = [(it["id"], it["x"], it["y"]) for it in
                  self.fake.load_config.return_value["layout"]["items"]]
        r = self.client.post("/api/layout/add", data={"plugin": "hello"})
        self.assertEqual(r.status_code, 409, r.get_data(as_text=True))
        j = r.get_json()
        self.assertFalse(j["ok"])
        self.assertIn("Auto-Pack", j.get("error", ""))
        # In-memory config unverändert
        after = [(it["id"], it["x"], it["y"]) for it in
                 self.fake.load_config.return_value["layout"]["items"]]
        self.assertEqual(before, after, "full-grid add still mutated state")


if __name__ == "__main__":
    unittest.main(verbosity=2)