#!/usr/bin/env python3
"""
Tests for scripts/graph_query.py — Graph Query Engine.

"""

import json
import sys
import tempfile
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parent))

from graph_query import load_index, build_adjacency, query_neighbors, query_path, query_subgraph, query_stats


def make_index(facts: list[dict], tmp_dir: Path) -> Path:
    index = {
        "version": 1,
        "last_updated": "2026-04-13T20:00:00Z",
        "total_facts": len(facts),
        "facts": facts,
    }
    path = tmp_dir / "index.json"
    with open(path, "w") as f:
        json.dump(index, f)
    return path


def test_neighbors():
    """Neighbor query returns directly connected facts."""
    facts = [
        {"id": "a", "fact": "A", "category": "fact", "related": ["b", "c"]},
        {"id": "b", "fact": "B", "category": "fact", "related": ["a"]},
        {"id": "c", "fact": "C", "category": "fact", "related": ["a"]},
        {"id": "d", "fact": "D", "category": "fact", "related": []},
    ]
    adj, id_to_fact = build_adjacency(facts)
    result = query_neighbors("a", adj, id_to_fact)
    neighbor_ids = {n["id"] for n in result["neighbors"]}
    assert neighbor_ids == {"b", "c"}, f"Expected b,c got {neighbor_ids}"
    assert result["count"] == 2
    print("PASS: neighbors")


def test_path_found():
    """Path query finds shortest path."""
    facts = [
        {"id": "a", "fact": "A", "related": ["b"]},
        {"id": "b", "fact": "B", "related": ["a", "c"]},
        {"id": "c", "fact": "C", "related": ["b", "d"]},
        {"id": "d", "fact": "D", "related": ["c"]},
    ]
    adj, id_to_fact = build_adjacency(facts)
    result = query_path("a", "d", adj)
    assert result["path"] == ["a", "b", "c", "d"], f"Got path {result['path']}"
    assert result["length"] == 3
    print("PASS: path_found")


def test_path_not_found():
    """Path query returns error when no path exists."""
    facts = [
        {"id": "a", "fact": "A", "related": ["b"]},
        {"id": "b", "fact": "B", "related": ["a"]},
        {"id": "c", "fact": "C", "related": ["d"]},
        {"id": "d", "fact": "D", "related": ["c"]},
    ]
    adj, id_to_fact = build_adjacency(facts)
    result = query_path("a", "c", adj, max_hops=5)
    assert result["path"] is None
    assert "error" in result
    print("PASS: path_not_found")


def test_subgraph_extraction():
    """Subgraph extraction returns nodes within depth."""
    facts = [
        {"id": "a", "fact": "A", "related": ["b", "c"]},
        {"id": "b", "fact": "B", "related": ["a", "d"]},
        {"id": "c", "fact": "C", "related": ["a"]},
        {"id": "d", "fact": "D", "related": ["b", "e"]},
        {"id": "e", "fact": "E", "related": ["d"]},
    ]
    adj, id_to_fact = build_adjacency(facts)
    result = query_subgraph("a", adj, id_to_fact, depth=1)
    node_ids = {n["id"] for n in result["nodes"]}
    assert node_ids == {"a", "b", "c"}, f"Got {node_ids}"
    assert result["node_count"] == 3
    print("PASS: subgraph_depth1")


def test_subgraph_depth2():
    """Depth-2 subgraph includes further nodes."""
    facts = [
        {"id": "a", "fact": "A", "related": ["b"]},
        {"id": "b", "fact": "B", "related": ["a", "c"]},
        {"id": "c", "fact": "C", "related": ["b", "d"]},
        {"id": "d", "fact": "D", "related": ["c"]},
    ]
    adj, id_to_fact = build_adjacency(facts)
    result = query_subgraph("a", adj, id_to_fact, depth=2)
    node_ids = {n["id"] for n in result["nodes"]}
    assert node_ids == {"a", "b", "c"}, f"Got {node_ids}"
    print("PASS: subgraph_depth2")


def test_stats():
    """Statistics query returns graph metrics."""
    facts = [
        {"id": "a", "fact": "A", "related": ["b"]},
        {"id": "b", "fact": "B", "related": ["a", "c"]},
        {"id": "c", "fact": "C", "related": ["b"]},
    ]
    adj, id_to_fact = build_adjacency(facts)
    result = query_stats(adj, id_to_fact)
    assert result["statistics"]["total_facts"] == 3
    assert result["statistics"]["total_edges"] == 2  # undirected double-counted /2
    assert result["statistics"]["average_degree"] > 0
    print("PASS: stats")


def test_cli_integration():
    """CLI produces valid JSON with correct query types."""
    with tempfile.TemporaryDirectory() as tmp:
        import subprocess as sp
        tmp_dir = Path(tmp)
        facts = [
            {"id": "x", "fact": "X", "related": ["y"]},
            {"id": "y", "fact": "Y", "related": ["x", "z"]},
            {"id": "z", "fact": "Z", "related": ["y"]},
        ]
        index_path = make_index(facts, tmp_dir)
        knowledge_dir = index_path.parent
        script_path = Path(__file__).resolve().parent / "graph_query.py"

        result = sp.run(
            [sys.executable, str(script_path), "neighbors", "x", "--knowledge-dir", str(knowledge_dir)],
            capture_output=True, text=True, cwd=str(tmp_dir)
        )
        assert result.returncode == 0, f"neighbors failed: {result.stderr}"
        out = json.loads(result.stdout)
        assert out["query"] == "neighbors"
        assert out["fact_id"] == "x"
        assert out["count"] == 1

        result = sp.run(
            [sys.executable, str(script_path), "path", "x", "z", "--knowledge-dir", str(knowledge_dir)],
            capture_output=True, text=True, cwd=str(tmp_dir)
        )
        assert result.returncode == 0, f"path failed: {result.stderr}"
        out = json.loads(result.stdout)
        assert out["path"] == ["x", "y", "z"]

        print("PASS: cli_integration")

if __name__ == "__main__":
    test_neighbors()
    test_path_found()
    test_path_not_found()
    test_subgraph_extraction()
    test_subgraph_depth2()
    test_stats()
    test_cli_integration()
    print("\nAll graph_query tests passed!")