"""The Read|Glob PreToolUse hook nudges toward the graph instead of raw reads.

Closes the issue #1114 gap: the Bash search hook never sees a file read through
the native Read tool or a Glob. These tests run the hook command the way Claude
Code does - via `sh -c` with crafted stdin JSON - and assert it nudges only for
a source/doc file outside graphify-out/ when a graph exists, and otherwise stays
silent and fails open.
"""
import json
import subprocess

from graphify.__main__ import _READ_SETTINGS_HOOK

CMD = _READ_SETTINGS_HOOK["hooks"][0]["command"]


def _run(tool_input, cwd, *, graph: bool):
    if graph:
        (cwd / "graphify-out").mkdir(parents=True, exist_ok=True)
        (cwd / "graphify-out" / "graph.json").write_text("{}", encoding="utf-8")
    stdin = json.dumps({"tool_input": tool_input})
    return subprocess.run(
        ["sh", "-c", CMD], input=stdin, capture_output=True, text=True, cwd=cwd
    )


def test_matcher_targets_read_and_glob():
    assert _READ_SETTINGS_HOOK["matcher"] == "Read|Glob"


def test_silent_without_graph(tmp_path):
    out = _run({"file_path": "src/app.py"}, tmp_path, graph=False).stdout
    assert out.strip() == ""


def test_nudges_on_source_read_with_graph(tmp_path):
    out = _run({"file_path": "src/app.py"}, tmp_path, graph=True).stdout
    assert "graphify query" in out


def test_nudge_payload_is_valid_pretooluse_json(tmp_path):
    out = _run({"file_path": "pkg/mod.ts"}, tmp_path, graph=True).stdout
    payload = json.loads(out)
    assert payload["hookSpecificOutput"]["hookEventName"] == "PreToolUse"
    assert "graphify query" in payload["hookSpecificOutput"]["additionalContext"]


def test_silent_on_graphify_out_targets(tmp_path):
    """Reading the graph's own report must not start a go-read-the-graph loop."""
    out = _run({"file_path": "graphify-out/GRAPH_REPORT.md"}, tmp_path, graph=True).stdout
    assert out.strip() == ""


def test_silent_on_non_source_files(tmp_path):
    for path in ("uv.lock", "logo.png", "data.bin", ".gitignore"):
        out = _run({"file_path": path}, tmp_path, graph=True).stdout
        assert out.strip() == "", f"{path} should not nudge"


def test_glob_pattern_nudges(tmp_path):
    out = _run({"pattern": "**/*.py", "path": "src"}, tmp_path, graph=True).stdout
    assert "graphify query" in out


def test_fails_open_on_malformed_stdin(tmp_path):
    (tmp_path / "graphify-out").mkdir()
    (tmp_path / "graphify-out" / "graph.json").write_text("{}", encoding="utf-8")
    r = subprocess.run(
        ["sh", "-c", CMD], input="this is not json", capture_output=True, text=True, cwd=tmp_path
    )
    assert r.returncode == 0
    assert r.stdout.strip() == ""


def test_never_blocks(tmp_path):
    """A nudge is additionalContext only - the hook must exit 0, never deny."""
    r = _run({"file_path": "src/app.py"}, tmp_path, graph=True)
    assert r.returncode == 0
    assert '"permissionDecision"' not in r.stdout
    assert '"deny"' not in r.stdout