# Copyright (C) 2012 Balazs Ankes (bank@inf.u-szeged.hu) University of Szeged
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
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# 1.  Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
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"""Supports checking WebKit style in png files."""

from webkitpy.common import read_checksum_from_png
from webkitpy.common.system.system_host import SystemHost


class PNGChecker(object):
    """Check svn:mime-type for checking style"""

    categories = set(['image/png'])

    def __init__(self, file_path, handle_style_error, host=None):
        self._file_path = file_path
        self._handle_style_error = handle_style_error
        self._host = host or SystemHost()
        self._fs = self._host.filesystem

    def check(self, inline=None):
        if self._fs.exists(self._file_path) and self._file_path.endswith('-expected.png'):
            with self._fs.open_binary_file_for_reading(self._file_path) as filehandle:
                if not read_checksum_from_png.read_checksum(filehandle):
                    self._handle_style_error(
                        0, 'image/png', 5,
                        'Image lacks a checksum. Generate pngs using run-webkit-tests to ensure they have a checksum.')