"""Static guard for direct filesystem mutation outside adapters/actions."""

from __future__ import annotations

import re
from pathlib import Path


MUTATING_PATTERNS = (
    re.compile(r"\.(mkdir|unlink|write_text|write_bytes|symlink_to|chmod)\("),
    re.compile(r"\b(os\.replace|shutil\.rmtree|shutil\.copy2|shutil\.copytree)\("),
    re.compile(r"runtime\.fs\.(create_symlink|remove_symlink|write_json|write_text|write_bytes|copy_file|copy_tree|remove_file|remove_tree)\("),
)

COMMAND_PATTERNS = (
    re.compile(r"runtime\.runner\.(run|run_shell)\("),
    re.compile(r"runtime\.git\.run\("),
    re.compile(r"runtime\.containers\.(run_container|start|stop|kill|rm)\("),
    re.compile(r"runtime\.tmux\.(new_session|set_option|respawn_pane)\("),
    re.compile(r"self\.(rt|tmux)\.(run_container|start|stop|kill|rm|new_session|set_option|respawn_pane)\("),
)

ALLOWED_PREFIXES = (
    Path("src/flow/adapters"),
    Path("src/flow/actions"),
    Path("tests"),
)

ALLOWED_FILES = {
    Path("src/flow/core/paths.py"),
}

def test_no_direct_filesystem_mutation_outside_action_boundary():
    root = Path(__file__).resolve().parents[1]
    offenders: list[str] = []
    for path in sorted((root / "src" / "flow").rglob("*.py")):
        rel = path.relative_to(root)
        if rel in ALLOWED_FILES:
            continue
        if any(rel.is_relative_to(prefix) for prefix in ALLOWED_PREFIXES):
            continue
        for line_no, line in enumerate(path.read_text(encoding="utf-8").splitlines(), 1):
            if "Service(" in line:
                continue
            if any(pattern.search(line) for pattern in MUTATING_PATTERNS):
                offenders.append(f"{rel}:{line_no}: {line.strip()}")

    assert offenders == []


def test_no_direct_command_mutation_outside_action_boundary():
    root = Path(__file__).resolve().parents[1]
    offenders: list[str] = []
    for path in sorted((root / "src" / "flow").rglob("*.py")):
        rel = path.relative_to(root)
        if any(rel.is_relative_to(prefix) for prefix in ALLOWED_PREFIXES):
            continue
        for line_no, line in enumerate(path.read_text(encoding="utf-8").splitlines(), 1):
            if any(pattern.search(line) for pattern in COMMAND_PATTERNS):
                offenders.append(f"{rel}:{line_no}: {line.strip()}")

    assert offenders == []