# Copyright (c) 2009, 2010, 2011 Google Inc. All rights reserved.
# Copyright (c) 2009 Apple Inc. All rights reserved.
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import logging
import os
import random
import re
import shutil
import string
import sys
import tempfile

from webkitpy.common.memoized import memoized
from webkitpy.common.system.executive import Executive, ScriptError

from .scm import SCM

_log = logging.getLogger(__name__)


class SVN(SCM):

    executable_name = "svn"

    _svn_metadata_files = frozenset(['.svn', '_svn'])

    def __init__(self, cwd, patch_directories, **kwargs):
        SCM.__init__(self, cwd, **kwargs)
        self._bogus_dir = None
        if patch_directories == []:
            raise Exception(message='Empty list of patch directories passed to SCM.__init__')
        elif patch_directories == None:
            self._patch_directories = [self._filesystem.relpath(cwd, self.checkout_root)]
        else:
            self._patch_directories = patch_directories

    @classmethod
    def in_working_directory(cls, path, executive=None):
        if os.path.isdir(os.path.join(path, '.svn')):
            # This is a fast shortcut for svn info that is usually correct for SVN < 1.7,
            # but doesn't work for SVN >= 1.7.
            return True

        executive = executive or Executive()
        svn_info_args = [cls.executable_name, 'info']
        exit_code = executive.run_command(svn_info_args, cwd=path, return_exit_code=True)
        return (exit_code == 0)

    def _find_uuid(self, path):
        if not self.in_working_directory(path):
            return None
        return self.value_from_svn_info(path, 'Repository UUID')

    @classmethod
    def value_from_svn_info(cls, path, field_name):
        svn_info_args = [cls.executable_name, 'info']
        # FIXME: This method should use a passed in executive or be made an instance method and use self._executive.
        info_output = Executive().run_command(svn_info_args, cwd=path).rstrip()
        match = re.search("^%s: (?P<value>.+)$" % field_name, info_output, re.MULTILINE)
        if not match:
            raise ScriptError(script_args=svn_info_args, message='svn info did not contain a %s.' % field_name)
        return match.group('value').rstrip('\r')

    def find_checkout_root(self, path):
        uuid = self._find_uuid(path)
        # If |path| is not in a working directory, we're supposed to return |path|.
        if not uuid:
            return path
        # Search up the directory hierarchy until we find a different UUID.
        last_path = None
        while True:
            if uuid != self._find_uuid(path):
                return last_path
            last_path = path
            (path, last_component) = self._filesystem.split(path)
            if last_path == path:
                return None

    def _run_svn(self, args, **kwargs):
        return self._run([self.executable_name] + args, **kwargs)

    @memoized
    def _svn_version(self):
        return self._run_svn(['--version', '--quiet'])

    def has_working_directory_changes(self):
        # FIXME: What about files which are not committed yet?
        return self._run_svn(["diff"], cwd=self.checkout_root, decode_output=False) != ""

    def status_command(self):
        return [self.executable_name, 'status']

    def _status_regexp(self, expected_types):
        field_count = 6 if self._svn_version() > "1.6" else 5
        return "^(?P<status>[%s]).{%s} (?P<filename>.+)$" % (expected_types, field_count)

    def _add_parent_directories(self, path):
        """Does 'svn add' to the path and its parents."""
        if self.in_working_directory(path):
            return
        self.add(path)

    def add_list(self, paths, return_exit_code=False):
        for path in paths:
            self._add_parent_directories(os.path.dirname(os.path.abspath(path)))
        return self._run_svn(["add"] + paths, return_exit_code=return_exit_code)

    def _delete_parent_directories(self, path):
        if not self.in_working_directory(path):
            return
        if set(os.listdir(path)) - self._svn_metadata_files:
            return  # Directory has non-trivial files in it.
        self.delete(path)

    def delete_list(self, paths):
        for path in paths:
            abs_path = os.path.abspath(path)
            parent, base = os.path.split(abs_path)
            result = self._run_svn(["delete", "--force", base], cwd=parent)
            self._delete_parent_directories(os.path.dirname(abs_path))
        return result

    def move(self, origin, destination):
        return self._run_svn(["mv", "--force", origin, destination], return_exit_code=True)

    def exists(self, path):
        return not self._run_svn(["info", path], return_exit_code=True, decode_output=False)

    def changed_files(self, git_commit=None):
        status_command = [self.executable_name, "status"]
        status_command.extend(self._patch_directories)
        # ACDMR: Addded, Conflicted, Deleted, Modified or Replaced
        return self._run_status_and_extract_filenames(status_command, self._status_regexp("ACDMR"))

    def _added_files(self):
        return self._run_status_and_extract_filenames(self.status_command(), self._status_regexp("A"))

    def _deleted_files(self):
        return self._run_status_and_extract_filenames(self.status_command(), self._status_regexp("D"))

    @staticmethod
    def supports_local_commits():
        return False

    def display_name(self):
        return "svn"

    def svn_revision(self, path):
        return self.value_from_svn_info(path, 'Revision')

    def timestamp_of_revision(self, path, revision):
        # We use --xml to get timestamps like 2013-02-08T08:18:04.964409Z
        repository_root = self.value_from_svn_info(self.checkout_root, 'Repository Root')
        info_output = Executive().run_command([self.executable_name, 'log', '-r', revision, '--xml', repository_root], cwd=path).rstrip()
        match = re.search(r"^<date>(?P<value>.+)</date>\r?$", info_output, re.MULTILINE)
        return match.group('value')

    def create_patch(self, git_commit=None, changed_files=None):
        """Returns a byte array (str()) representing the patch file.
        Patch files are effectively binary since they may contain
        files of multiple different encodings."""
        if changed_files == []:
            return ""
        elif changed_files == None:
            changed_files = []
        return self._run([self._filesystem.join(self.checkout_root, 'Tools', 'Scripts', 'svn-create-patch')] + changed_files,
            cwd=self.checkout_root, return_stderr=False,
            decode_output=False)

    def blame(self, path):
        return self._run_svn(['blame', path])