# Copyright (C) 2010 Google Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
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#     * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
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# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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import urllib

from webkitpy.tool.steps.abstractstep import AbstractStep
from webkitpy.tool.steps.options import Options
from webkitpy.common.prettypatch import PrettyPatch
from webkitpy.common.system import logutils
from webkitpy.common.system.executive import ScriptError


_log = logutils.get_logger(__file__)


class ConfirmDiff(AbstractStep):
    @classmethod
    def options(cls):
        return AbstractStep.options() + [
            Options.confirm,
        ]

    def _show_pretty_diff(self):
        if not self._tool.user.can_open_url():
            return None

        try:
            pretty_patch = PrettyPatch(self._tool.executive)
            pretty_diff_file = pretty_patch.pretty_diff_file(self.diff())
            url = "file://%s" % urllib.quote(pretty_diff_file.name)
            self._tool.user.open_url(url)
            # We return the pretty_diff_file here because we need to keep the
            # file alive until the user has had a chance to confirm the diff.
            return pretty_diff_file
        except ScriptError, e:
            _log.warning("PrettyPatch failed.  :(")
        except OSError, e:
            _log.warning("PrettyPatch unavailable.")

    def diff(self):
        changed_files = self._tool.scm().changed_files(self._options.git_commit)
        return self._tool.scm().create_patch(self._options.git_commit,
            changed_files=changed_files)

    def run(self, state):
        if not self._options.confirm:
            return
        pretty_diff_file = self._show_pretty_diff()
        if pretty_diff_file:
            diff_correct = self._tool.user.confirm("Was that diff correct?")
            pretty_diff_file.close()
            if not diff_correct:
                self._exit(1)