# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

import os
import platform

from mozlint import result
from mozlint.pathutils import expand_exclusions


def lint(paths, config, fix=None, **lintargs):
    results = []

    if platform.system() == "Windows":
        # Windows doesn't have permissions in files
        # Exit now
        return results

    files = list(expand_exclusions(paths, config, lintargs["root"]))
    for f in files:
        if os.access(f, os.X_OK):
            if config.get("allow-shebang"):
                with open(f, "r+") as content:
                    # Some source files have +x permissions
                    line = content.readline()
                    if line.startswith("#!"):
                        # Check if the file doesn't start with a shebang
                        # if it does, not a warning
                        continue

            if fix:
                # We want to fix it, do it and leave
                os.chmod(f, 0o644)
                continue

            res = {
                "path": f,
                "message": "Execution permissions on a source file",
                "level": "error",
            }
            results.append(result.from_config(config, **res))
    return results