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"""Supports ensuring equality of FeatureDefines.xcconfig files."""

import os

from webkitpy.common.system.systemhost import SystemHost


class FeatureDefinesChecker(object):
    categories = set(['featuredefines/new', 'featuredefines/equality'])

    def __init__(self, file_path, handle_style_error):
        self._file_path = file_path
        self._handle_style_error = handle_style_error
        self._handle_style_error.turn_off_line_filtering()
        self._host = SystemHost()
        self._fs = self._host.filesystem

    def check(self, inline=None):
        feature_defines_files = [
            "Source/JavaScriptCore/Configurations/FeatureDefines.xcconfig",
            "Source/WebCore/Configurations/FeatureDefines.xcconfig",
            "Source/WebKit/mac/Configurations/FeatureDefines.xcconfig",
            "Source/WebKit2/Configurations/FeatureDefines.xcconfig",
            "Tools/TestWebKitAPI/Configurations/FeatureDefines.xcconfig",
        ]

        if self._file_path not in feature_defines_files:
            self._handle_style_error(0, 'featuredefines/new', 5, "Patch introduces a new FeatureDefines.xcconfig, which check-webkit-style doesn't know about. Please add it to the list in featuredefines.py.")
            return

        with self._fs.open_binary_file_for_reading(self._file_path) as filehandle:
            baseline_content = filehandle.read()

        other_feature_defines_files = feature_defines_files
        other_feature_defines_files.remove(self._file_path)

        for path in other_feature_defines_files:
            with self._fs.open_binary_file_for_reading(path) as filehandle:
                test_content = filehandle.read()
                if baseline_content != test_content:
                    self._handle_style_error(0, 'featuredefines/equality', 5, "Any changes made to FeatureDefines should be made to all of them (changed file does not match {0}).".format(path))