"""Tests for explicit tunnel helpers in mempalace.palace_graph."""

from unittest.mock import MagicMock, patch

import pytest

with patch.dict("sys.modules", {"chromadb": MagicMock()}):
    import mempalace.palace_graph as palace_graph


def _use_tmp_tunnel_file(monkeypatch, tmp_path):
    tunnel_file = tmp_path / "tunnels.json"
    monkeypatch.setattr(palace_graph, "_TUNNEL_FILE", str(tunnel_file))
    return tunnel_file


class TestTunnelStorage:
    def test_load_tunnels_missing_file_returns_empty_list(self, tmp_path, monkeypatch):
        _use_tmp_tunnel_file(monkeypatch, tmp_path)
        assert palace_graph._load_tunnels() == []

    def test_load_tunnels_corrupt_file_returns_empty_list(self, tmp_path, monkeypatch):
        tunnel_file = _use_tmp_tunnel_file(monkeypatch, tmp_path)
        tunnel_file.write_text("{not valid json", encoding="utf-8")
        assert palace_graph._load_tunnels() == []

    def test_save_and_load_round_trip(self, tmp_path, monkeypatch):
        _use_tmp_tunnel_file(monkeypatch, tmp_path)
        tunnels = [
            {
                "id": "abc123",
                "source": {"wing": "wing_code", "room": "auth"},
                "target": {"wing": "wing_people", "room": "users"},
                "label": "same concept",
            }
        ]
        palace_graph._save_tunnels(tunnels)
        assert palace_graph._load_tunnels() == tunnels


class TestExplicitTunnels:
    def test_create_tunnel_deduplicates_reverse_order_and_updates_label(
        self, tmp_path, monkeypatch
    ):
        _use_tmp_tunnel_file(monkeypatch, tmp_path)

        first = palace_graph.create_tunnel(
            "wing_code", "auth", "wing_people", "users", label="same concept"
        )
        second = palace_graph.create_tunnel(
            "wing_people", "users", "wing_code", "auth", label="updated label"
        )

        assert first["id"] == second["id"]
        assert len(palace_graph.list_tunnels()) == 1
        assert second["label"] == "updated label"
        assert second["created_at"] == first["created_at"]
        assert "updated_at" in second

    def test_create_tunnel_rejects_empty_names(self, tmp_path, monkeypatch):
        _use_tmp_tunnel_file(monkeypatch, tmp_path)

        with pytest.raises(ValueError):
            palace_graph.create_tunnel("", "auth", "wing_people", "users")

    def test_list_tunnels_filters_by_either_side(self, tmp_path, monkeypatch):
        _use_tmp_tunnel_file(monkeypatch, tmp_path)

        palace_graph.create_tunnel("wing_code", "auth", "wing_people", "users", label="A")
        palace_graph.create_tunnel("wing_ops", "deploy", "wing_people", "users", label="B")

        assert len(palace_graph.list_tunnels()) == 2
        assert len(palace_graph.list_tunnels("wing_people")) == 2
        assert len(palace_graph.list_tunnels("wing_code")) == 1

    def test_delete_tunnel_removes_saved_tunnel(self, tmp_path, monkeypatch):
        _use_tmp_tunnel_file(monkeypatch, tmp_path)

        tunnel = palace_graph.create_tunnel(
            "wing_code", "auth", "wing_people", "users", label="same concept"
        )

        assert palace_graph.delete_tunnel(tunnel["id"]) == {"deleted": tunnel["id"]}
        assert palace_graph.list_tunnels() == []

    def test_follow_tunnels_returns_direction_and_preview(self, tmp_path, monkeypatch):
        _use_tmp_tunnel_file(monkeypatch, tmp_path)

        palace_graph.create_tunnel(
            "wing_code",
            "auth",
            "wing_people",
            "users",
            label="same concept",
            target_drawer_id="drawer_users_1",
        )

        col = MagicMock()
        col.get.return_value = {
            "ids": ["drawer_users_1"],
            "documents": ["A" * 400],
            "metadatas": [{}],
        }

        outgoing = palace_graph.follow_tunnels("wing_code", "auth", col=col)
        assert len(outgoing) == 1
        assert outgoing[0]["direction"] == "outgoing"
        assert outgoing[0]["connected_wing"] == "wing_people"
        assert outgoing[0]["connected_room"] == "users"
        assert outgoing[0]["drawer_id"] == "drawer_users_1"
        assert len(outgoing[0]["drawer_preview"]) == 300

        incoming = palace_graph.follow_tunnels("wing_people", "users", col=col)
        assert len(incoming) == 1
        assert incoming[0]["direction"] == "incoming"
        assert incoming[0]["connected_wing"] == "wing_code"

    def test_follow_tunnels_returns_connections_even_if_collection_lookup_fails(
        self, tmp_path, monkeypatch
    ):
        _use_tmp_tunnel_file(monkeypatch, tmp_path)

        palace_graph.create_tunnel(
            "wing_code",
            "auth",
            "wing_people",
            "users",
            label="same concept",
            target_drawer_id="drawer_users_1",
        )

        col = MagicMock()
        col.get.side_effect = RuntimeError("boom")

        connections = palace_graph.follow_tunnels("wing_code", "auth", col=col)
        assert len(connections) == 1
        assert "drawer_preview" not in connections[0]