# Copyright (c) 2010 Google Inc. All rights reserved.
#
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# modification, are permitted provided that the following conditions are
# met:
#
#     * 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 logging
import optparse
import sys
import urllib

from webkitpy.common.prettypatch import PrettyPatch
from webkitpy.common.system.executive import ScriptError
from webkitpy.tool.commands.command import Command


_log = logging.getLogger(__name__)


class PrettyDiff(Command):
    name = 'pretty-diff'
    help_text = 'Shows the pretty diff in the default browser'
    show_in_main_help = True

    def __init__(self):
        options = [
            optparse.make_option('-g', '--git-commit', action='store', dest='git_commit',
                                 help=('Operate on a local commit. If a range, the commits are squashed into one. <ref>.... '
                                       'includes the working copy changes. UPSTREAM can be used for the upstream/tracking branch.'))
        ]
        super(PrettyDiff, self).__init__(options)
        self._tool = None

    def execute(self, options, args, tool):
        self._tool = tool
        pretty_diff_file = self._show_pretty_diff(options)
        if pretty_diff_file:
            diff_correct = tool.user.confirm('Was that diff correct?')
            pretty_diff_file.close()
            if not diff_correct:
                sys.exit(1)

    def _show_pretty_diff(self, options):
        if not self._tool.user.can_open_url():
            return None
        try:
            pretty_patch = PrettyPatch(self._tool.executive)
            patch = self._diff(options)
            pretty_diff_file = pretty_patch.pretty_diff_file(patch)
            self._open_pretty_diff(pretty_diff_file.name)
            # 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 as error:
            _log.warning('PrettyPatch failed.  :(')
            _log.error(error.message_with_output())
            self._exit(error.exit_code or 2)
        except OSError:
            _log.warning('PrettyPatch unavailable.')

    def _diff(self, options):
        changed_files = self._tool.git().changed_files(options.git_commit)
        return self._tool.git().create_patch(options.git_commit,
                                             changed_files=changed_files)

    def _open_pretty_diff(self, file_path):
        if self._tool.platform.is_cygwin():
            assert file_path.endswith('.html')
            self._tool.executive.run_command(['cygstart', file_path])
            return
        url = 'file://%s' % urllib.quote(file_path)
        self._tool.user.open_url(url)