#!/usr/bin/env python3
"""Tests for scripts/knowledge_staleness_check.py — 8 tests."""

import json
import os
import sys
import tempfile

sys.path.insert(0, os.path.dirname(__file__) or ".")
import importlib.util
spec = importlib.util.spec_from_file_location("ks", os.path.join(os.path.dirname(__file__) or ".", "knowledge_staleness_check.py"))
mod = importlib.util.module_from_spec(spec)
spec.loader.exec_module(mod)
check_staleness = mod.check_staleness
fix_hashes = mod.fix_hashes
compute_file_hash = mod.compute_file_hash


def test_fresh_entry():
    with tempfile.TemporaryDirectory() as tmpdir:
        src = os.path.join(tmpdir, "source.py")
        with open(src, "w") as f:
            f.write("print('hello')")
        h = compute_file_hash(src)
        idx = os.path.join(tmpdir, "index.json")
        with open(idx, "w") as f:
            json.dump({"facts": [{"fact": "hello", "source_file": "source.py", "source_hash": h}]}, f)
        results = check_staleness(idx, tmpdir)
        assert results[0]["status"] == "fresh"
        print("PASS: test_fresh_entry")


def test_stale_entry():
    with tempfile.TemporaryDirectory() as tmpdir:
        src = os.path.join(tmpdir, "source.py")
        with open(src, "w") as f:
            f.write("original content")
        idx = os.path.join(tmpdir, "index.json")
        with open(idx, "w") as f:
            json.dump({"facts": [{"fact": "old", "source_file": "source.py", "source_hash": "sha256:wrong"}]}, f)
        # Now change the source
        with open(src, "w") as f:
            f.write("modified content")
        results = check_staleness(idx, tmpdir)
        assert results[0]["status"] == "stale"
        print("PASS: test_stale_entry")


def test_missing_source():
    with tempfile.TemporaryDirectory() as tmpdir:
        idx = os.path.join(tmpdir, "index.json")
        with open(idx, "w") as f:
            json.dump({"facts": [{"fact": "gone", "source_file": "nonexistent.py", "source_hash": "sha256:abc"}]}, f)
        results = check_staleness(idx, tmpdir)
        assert results[0]["status"] == "missing_source"
        print("PASS: test_missing_source")


def test_no_hash():
    with tempfile.TemporaryDirectory() as tmpdir:
        src = os.path.join(tmpdir, "source.py")
        with open(src, "w") as f:
            f.write("content")
        idx = os.path.join(tmpdir, "index.json")
        with open(idx, "w") as f:
            json.dump({"facts": [{"fact": "no hash", "source_file": "source.py"}]}, f)
        results = check_staleness(idx, tmpdir)
        assert results[0]["status"] == "no_hash"
        assert results[0]["current_hash"].startswith("sha256:")
        print("PASS: test_no_hash")


def test_no_source_field():
    with tempfile.TemporaryDirectory() as tmpdir:
        idx = os.path.join(tmpdir, "index.json")
        with open(idx, "w") as f:
            json.dump({"facts": [{"fact": "orphan"}]}, f)
        results = check_staleness(idx, tmpdir)
        assert results[0]["status"] == "no_source"
        print("PASS: test_no_source_field")


def test_fix_hashes():
    with tempfile.TemporaryDirectory() as tmpdir:
        src = os.path.join(tmpdir, "source.py")
        with open(src, "w") as f:
            f.write("content for hashing")
        idx = os.path.join(tmpdir, "index.json")
        with open(idx, "w") as f:
            json.dump({"facts": [{"fact": "needs hash", "source_file": "source.py"}]}, f)
        fixed = fix_hashes(idx, tmpdir)
        assert fixed == 1
        # Verify hash was added
        with open(idx) as f:
            data = json.load(f)
        assert data["facts"][0]["source_hash"].startswith("sha256:")
        print("PASS: test_fix_hashes")


def test_empty_index():
    with tempfile.TemporaryDirectory() as tmpdir:
        idx = os.path.join(tmpdir, "index.json")
        with open(idx, "w") as f:
            json.dump({"facts": []}, f)
        results = check_staleness(idx, tmpdir)
        assert results == []
        print("PASS: test_empty_index")


def test_compute_hash_nonexistent():
    h = compute_file_hash("/nonexistent/path/file.py")
    assert h is None
    print("PASS: test_compute_hash_nonexistent")


def run_all():
    test_fresh_entry()
    test_stale_entry()
    test_missing_source()
    test_no_hash()
    test_no_source_field()
    test_fix_hashes()
    test_empty_index()
    test_compute_hash_nonexistent()
    print("\nAll 8 tests passed!")


if __name__ == "__main__":
    run_all()