import os
import tempfile
import pytest

from app.tools.ast_parser import (
    detect_security_issues,
    parse_python_file,
    parse_repository,
    scan_repository_security,
)


def _write(tmpdir: str, filename: str, content: str) -> str:
    path = os.path.join(tmpdir, filename)
    with open(path, "w") as f:
        f.write(content)
    return path


# ── parse_python_file ────────────────────────────────────────────────────────


def test_parse_python_file_extracts_functions() -> None:
    with tempfile.TemporaryDirectory() as d:
        p = _write(d, "f.py", "def hello(x, y):\n    pass\n")
        result = parse_python_file(p)
    assert any(fn["name"] == "hello" for fn in result["functions"])
    assert result["errors"] == []


def test_parse_python_file_extracts_classes() -> None:
    with tempfile.TemporaryDirectory() as d:
        p = _write(d, "c.py", "class Foo:\n    pass\n")
        result = parse_python_file(p)
    assert any(cls["name"] == "Foo" for cls in result["classes"])


def test_parse_python_file_extracts_imports() -> None:
    with tempfile.TemporaryDirectory() as d:
        p = _write(d, "i.py", "import os\nfrom pathlib import Path\n")
        result = parse_python_file(p)
    assert "os" in result["imports"]
    assert "pathlib" in result["imports"]


def test_parse_python_file_handles_syntax_error() -> None:
    with tempfile.TemporaryDirectory() as d:
        p = _write(d, "bad.py", "def broken(\n")
        result = parse_python_file(p)
    assert any("SyntaxError" in e for e in result["errors"])


def test_parse_repository_skips_non_python() -> None:
    with tempfile.TemporaryDirectory() as d:
        _write(d, "readme.md", "# hi")
        _write(d, "main.py", "x = 1\n")
        results = parse_repository(d)
    assert len(results) == 1
    assert results[0]["file"].endswith("main.py")


# ── detect_security_issues ───────────────────────────────────────────────────


def test_detects_eval() -> None:
    with tempfile.TemporaryDirectory() as d:
        p = _write(d, "e.py", "result = eval(user_input)\n")
        findings = detect_security_issues(p)
    rules = [f["rule"] for f in findings]
    assert "dangerous-eval" in rules


def test_detects_exec() -> None:
    with tempfile.TemporaryDirectory() as d:
        p = _write(d, "e.py", "exec(user_code)\n")
        findings = detect_security_issues(p)
    rules = [f["rule"] for f in findings]
    assert "dangerous-exec" in rules


def test_detects_shell_true() -> None:
    with tempfile.TemporaryDirectory() as d:
        p = _write(d, "s.py", "import subprocess\nsubprocess.run(cmd, shell=True)\n")
        findings = detect_security_issues(p)
    rules = [f["rule"] for f in findings]
    assert "shell-injection" in rules


def test_detects_hardcoded_secret() -> None:
    with tempfile.TemporaryDirectory() as d:
        p = _write(d, "k.py", 'api_key = "supersecretvalue"\n')
        findings = detect_security_issues(p)
    rules = [f["rule"] for f in findings]
    assert "hardcoded-secret" in rules


def test_no_false_positive_on_clean_file() -> None:
    with tempfile.TemporaryDirectory() as d:
        p = _write(d, "clean.py", "def add(a, b):\n    return a + b\n")
        findings = detect_security_issues(p)
    assert findings == []


def test_handles_syntax_error_gracefully() -> None:
    with tempfile.TemporaryDirectory() as d:
        p = _write(d, "bad.py", "def broken(\n")
        findings = detect_security_issues(p)
    assert findings == []  # returns empty, doesn't raise


def test_scan_repository_security_aggregates() -> None:
    with tempfile.TemporaryDirectory() as d:
        _write(d, "a.py", "eval(x)\n")
        _write(d, "b.py", "def safe():\n    return 1\n")
        findings = scan_repository_security(d)
    assert any(f["rule"] == "dangerous-eval" for f in findings)


@pytest.mark.parametrize("rule,code", [
    ("dangerous-eval", "eval(x)\n"),
    ("dangerous-exec", "exec(x)\n"),
    ("shell-injection", "import subprocess\nsubprocess.run(c, shell=True)\n"),
    ("hardcoded-secret", 'password = "hunter2abc"\n'),
])
def test_parametrized_detection(rule: str, code: str) -> None:
    with tempfile.TemporaryDirectory() as d:
        p = _write(d, "t.py", code)
        findings = detect_security_issues(p)
    assert any(f["rule"] == rule for f in findings)