graphify/tests/test_hypergraph.py

"""Tests for hyperedge support in graphify."""
from __future__ import annotations
import json
import tempfile
from pathlib import Path

import networkx as nx
import pytest

from graphify.build import build_from_json
from graphify.export import attach_hyperedges, to_json
from graphify.report import generate


# ---------------------------------------------------------------------------
# Fixtures
# ---------------------------------------------------------------------------

SAMPLE_EXTRACTION = {
    "nodes": [
        {"id": "BasicAuth", "label": "BasicAuth", "file_type": "code", "source_file": "auth.py"},
        {"id": "DigestAuth", "label": "DigestAuth", "file_type": "code", "source_file": "auth.py"},
        {"id": "Request", "label": "Request", "file_type": "code", "source_file": "http.py"},
        {"id": "Response", "label": "Response", "file_type": "code", "source_file": "http.py"},
        {"id": "BaseClient", "label": "BaseClient", "file_type": "code", "source_file": "client.py"},
    ],
    "edges": [
        {"source": "BasicAuth", "target": "Request", "relation": "uses", "confidence": "EXTRACTED", "confidence_score": 1.0, "source_file": "auth.py"},
    ],
    "hyperedges": [
        {
            "id": "auth_flow",
            "label": "Auth Flow",
            "nodes": ["BasicAuth", "DigestAuth", "Request", "Response", "BaseClient"],
            "relation": "participate_in",
            "confidence": "INFERRED",
            "confidence_score": 0.75,
            "source_file": "auth.py",
        }
    ],
    "input_tokens": 10,
    "output_tokens": 5,
}

SAMPLE_DETECTION = {
    "total_files": 3,
    "total_words": 500,
    "files": {"code": ["auth.py", "http.py", "client.py"]},
    "skipped_sensitive": [],
    "warning": None,
}


# ---------------------------------------------------------------------------
# 1. Hyperedges survive build_from_json round-trip
# ---------------------------------------------------------------------------

def test_build_from_json_stores_hyperedges():
    G = build_from_json(SAMPLE_EXTRACTION)
    assert "hyperedges" in G.graph
    assert len(G.graph["hyperedges"]) == 1
    assert G.graph["hyperedges"][0]["id"] == "auth_flow"


def test_build_from_json_no_hyperedges():
    extraction = {**SAMPLE_EXTRACTION, "hyperedges": []}
    G = build_from_json(extraction)
    assert G.graph.get("hyperedges", []) == []


def test_build_from_json_missing_hyperedges_key():
    extraction = {k: v for k, v in SAMPLE_EXTRACTION.items() if k != "hyperedges"}
    G = build_from_json(extraction)
    assert G.graph.get("hyperedges", []) == []


# ---------------------------------------------------------------------------
# 2. attach_hyperedges deduplicates by id
# ---------------------------------------------------------------------------

def test_attach_hyperedges_adds_new():
    G = nx.Graph()
    attach_hyperedges(G, [{"id": "auth_flow", "label": "Auth Flow", "nodes": ["A", "B", "C"]}])
    assert len(G.graph["hyperedges"]) == 1


def test_attach_hyperedges_deduplicates():
    G = nx.Graph()
    h = {"id": "auth_flow", "label": "Auth Flow", "nodes": ["A", "B", "C"]}
    attach_hyperedges(G, [h])
    attach_hyperedges(G, [h])  # second call with same id should not duplicate
    assert len(G.graph["hyperedges"]) == 1


def test_attach_hyperedges_multiple_different_ids():
    G = nx.Graph()
    attach_hyperedges(G, [
        {"id": "flow_a", "label": "Flow A", "nodes": ["A", "B", "C"]},
        {"id": "flow_b", "label": "Flow B", "nodes": ["D", "E", "F"]},
    ])
    assert len(G.graph["hyperedges"]) == 2


def test_attach_hyperedges_skips_entry_without_id():
    G = nx.Graph()
    attach_hyperedges(G, [{"label": "No ID", "nodes": ["A", "B", "C"]}])
    assert G.graph.get("hyperedges", []) == []


# ---------------------------------------------------------------------------
# 3. to_json includes hyperedges key
# ---------------------------------------------------------------------------

def test_to_json_includes_hyperedges():
    G = build_from_json(SAMPLE_EXTRACTION)
    communities = {0: list(G.nodes())}
    with tempfile.NamedTemporaryFile(suffix=".json", delete=False) as f:
        path = f.name
    to_json(G, communities, path)
    data = json.loads(Path(path).read_text())
    assert "hyperedges" in data
    assert len(data["hyperedges"]) == 1
    assert data["hyperedges"][0]["id"] == "auth_flow"


def test_to_json_hyperedges_empty_when_none():
    extraction = {**SAMPLE_EXTRACTION, "hyperedges": []}
    G = build_from_json(extraction)
    communities = {0: list(G.nodes())}
    with tempfile.NamedTemporaryFile(suffix=".json", delete=False) as f:
        path = f.name
    to_json(G, communities, path)
    data = json.loads(Path(path).read_text())
    assert "hyperedges" in data
    assert data["hyperedges"] == []


# ---------------------------------------------------------------------------
# 4. Hyperedges loaded from graph.json via build_from_json
# ---------------------------------------------------------------------------

def test_hyperedges_roundtrip_via_json_file():
    """Write graph.json then reload it - hyperedges must survive."""
    G = build_from_json(SAMPLE_EXTRACTION)
    communities = {0: list(G.nodes())}
    with tempfile.NamedTemporaryFile(suffix=".json", delete=False) as f:
        path = f.name
    to_json(G, communities, path)

    # Reload the JSON as if build_from_json were called on it
    data = json.loads(Path(path).read_text())
    G2 = build_from_json({
        "nodes": [{"id": n["id"], **{k: v for k, v in n.items() if k != "id"}} for n in data["nodes"]],
        "edges": [{"source": e["source"], "target": e["target"], **{k: v for k, v in e.items() if k not in ("source", "target")}} for e in data.get("links", [])],
        "hyperedges": data.get("hyperedges", []),
    })
    assert G2.graph.get("hyperedges", []) != []
    assert G2.graph["hyperedges"][0]["id"] == "auth_flow"


# ---------------------------------------------------------------------------
# 5. Report includes hyperedges section when hyperedges present
# ---------------------------------------------------------------------------

def _make_report(G):
    communities = {0: list(G.nodes())}
    cohesion = {0: 1.0}
    labels = {0: "All"}
    gods = [{"label": "BasicAuth", "edges": 2}]
    surprises = []
    return generate(G, communities, cohesion, labels, gods, surprises, SAMPLE_DETECTION, {"input": 10, "output": 5}, ".")


def test_report_includes_hyperedges_section():
    G = build_from_json(SAMPLE_EXTRACTION)
    report = _make_report(G)
    assert "## Hyperedges (group relationships)" in report
    assert "Auth Flow" in report
    assert "INFERRED 0.75" in report


def test_report_includes_hyperedge_node_list():
    G = build_from_json(SAMPLE_EXTRACTION)
    report = _make_report(G)
    # Node IDs should appear in the report line
    assert "BasicAuth" in report
    assert "DigestAuth" in report


# ---------------------------------------------------------------------------
# 6. Report skips hyperedges section when none present
# ---------------------------------------------------------------------------

def test_report_skips_hyperedges_section_when_empty():
    extraction = {**SAMPLE_EXTRACTION, "hyperedges": []}
    G = build_from_json(extraction)
    report = _make_report(G)
    assert "## Hyperedges" not in report


def test_report_skips_hyperedges_section_when_key_missing():
    extraction = {k: v for k, v in SAMPLE_EXTRACTION.items() if k != "hyperedges"}
    G = build_from_json(extraction)
    report = _make_report(G)
    assert "## Hyperedges" not in report