import re

from itertools import chain

from dulwich import objects

from subprocess import Popen, PIPE

import rhodecode

from rhodecode.lib.vcs.conf import settings

from rhodecode.lib.vcs.exceptions import RepositoryError

from rhodecode.lib.vcs.exceptions import ChangesetError

from rhodecode.lib.vcs.exceptions import NodeDoesNotExistError

from rhodecode.lib.vcs.exceptions import VCSError

from rhodecode.lib.vcs.exceptions import ChangesetDoesNotExistError

from rhodecode.lib.vcs.exceptions import ImproperArchiveTypeError

from rhodecode.lib.vcs.backends.base import BaseChangeset, EmptyChangeset

from rhodecode.lib.vcs.nodes import FileNode, DirNode, NodeKind, RootNode, \

    RemovedFileNode, SubModuleNode, ChangedFileNodesGenerator,\

    AddedFileNodesGenerator, RemovedFileNodesGenerator

from rhodecode.lib.vcs.utils import safe_unicode

from rhodecode.lib.vcs.utils import date_fromtimestamp

from rhodecode.lib.vcs.utils.lazy import LazyProperty

class GitChangeset(BaseChangeset):

    """

    Represents state of the repository at single revision.

    """

    def __init__(self, repository, revision):

        self._stat_modes = {}

        self.repository = repository

        try:

            commit = self.repository._repo.get_object(revision)

            if isinstance(commit, objects.Tag):

                revision = commit.object[1]

                commit = self.repository._repo.get_object(commit.object[1])

        except KeyError:

            raise RepositoryError("Cannot get object with id %s" % revision)

        self.raw_id = revision

        self.id = self.raw_id

        self.short_id = self.raw_id[:12]

        self._commit = commit

        self._tree_id = commit.tree

        self._committer_property = 'committer'

        self._author_property = 'author'

        self._date_property = 'commit_time'

        self._date_tz_property = 'commit_timezone'

        self.revision = repository.revisions.index(revision)

        self.message = safe_unicode(commit.message)

        self.nodes = {}

        self._paths = {}

    @LazyProperty

    def committer(self):

        return safe_unicode(getattr(self._commit, self._committer_property))

    @LazyProperty

    def author(self):

        return safe_unicode(getattr(self._commit, self._author_property))

    @LazyProperty

    def date(self):

        return date_fromtimestamp(getattr(self._commit, self._date_property),

                                  getattr(self._commit, self._date_tz_property))

    @LazyProperty

    def _timestamp(self):

        return getattr(self._commit, self._date_property)

    @LazyProperty

    def status(self):

        """

        Returns modified, added, removed, deleted files for current changeset

        """

        return self.changed, self.added, self.removed

    @LazyProperty

    def tags(self):

        _tags = []

        for tname, tsha in self.repository.tags.iteritems():

            if tsha == self.raw_id:

                _tags.append(tname)

        return _tags

    @LazyProperty

    def branch(self):

        heads = self.repository._heads(reverse=False)

        ref = heads.get(self.raw_id)

        if ref:

            return safe_unicode(ref)

    def _fix_path(self, path):

        """

        Paths are stored without trailing slash so we need to get rid off it if

        needed.

        """

        if path.endswith('/'):

            path = path.rstrip('/')

        return path

    def _get_id_for_path(self, path):

        # FIXME: Please, spare a couple of minutes and make those codes cleaner;

        if not path in self._paths:

            path = path.strip('/')

            # set root tree

            tree = self.repository._repo[self._tree_id]

            if path == '':

                self._paths[''] = tree.id

                return tree.id

            splitted = path.split('/')

        children = []

        for l in so.splitlines():

            childs = l.split(' ')[1:]

            children.extend(childs)

        return [self.repository.get_changeset(cs) for cs in children]

    def next(self, branch=None):

        if branch and self.branch != branch:

            raise VCSError('Branch option used on changeset not belonging '

                           'to that branch')

        def _next(changeset, branch):

            try:

                next_ = changeset.revision + 1

                next_rev = changeset.repository.revisions[next_]

            except IndexError:

                raise ChangesetDoesNotExistError

            cs = changeset.repository.get_changeset(next_rev)

            if branch and branch != cs.branch:

                return _next(cs, branch)

            return cs

        return _next(self, branch)

    def prev(self, branch=None):

        if branch and self.branch != branch:

            raise VCSError('Branch option used on changeset not belonging '

                           'to that branch')

        def _prev(changeset, branch):

            try:

                prev_ = changeset.revision - 1

                if prev_ < 0:

                    raise IndexError

                prev_rev = changeset.repository.revisions[prev_]

            except IndexError:

                raise ChangesetDoesNotExistError

            cs = changeset.repository.get_changeset(prev_rev)

            if branch and branch != cs.branch:

                return _prev(cs, branch)

            return cs

        return _prev(self, branch)

    def diff(self, ignore_whitespace=True, context=3):

        rev1 = self.parents[0] if self.parents else self.repository.EMPTY_CHANGESET

        rev2 = self

        return ''.join(self.repository.get_diff(rev1, rev2,

                                    ignore_whitespace=ignore_whitespace,

                                    context=context))

    def get_file_mode(self, path):

        """

        Returns stat mode of the file at the given ``path``.

        """

        # ensure path is traversed

        self._get_id_for_path(path)

        return self._stat_modes[path]

    def get_file_content(self, path):

        """

        Returns content of the file at given ``path``.

        """

        id = self._get_id_for_path(path)

        blob = self.repository._repo[id]

        return blob.as_pretty_string()

    def get_file_size(self, path):

        """

        Returns size of the file at given ``path``.

        """

        id = self._get_id_for_path(path)

        blob = self.repository._repo[id]

        return blob.raw_length()

    def get_file_changeset(self, path):

        """

        Returns last commit of the file at the given ``path``.

        """

        return self.get_file_history(path, limit=1)[0]

    def get_file_history(self, path, limit=None):

        """

        Returns history of file as reversed list of ``Changeset`` objects for

        which file at given ``path`` has been modified.

        TODO: This function now uses os underlying 'git' and 'grep' commands

        which is generally not good. Should be replaced with algorithm

        iterating commits.

        """

        if limit:

            cmd = 'log -n %s --pretty="format: %%H" -s -p %s -- "%s"' % (

                   )

        else:

            cmd = 'log --pretty="format: %%H" -s -p %s -- "%s"' % (

                   )

        so, se = self.repository.run_git_command(cmd)

        ids = re.findall(r'[0-9a-fA-F]{40}', so)

        return [self.repository.get_changeset(id) for id in ids]

    def get_file_history_2(self, path):

        """

        Returns history of file as reversed list of ``Changeset`` objects for

        which file at given ``path`` has been modified.

        """

        self._get_filectx(path)

        from dulwich.walk import Walker

        include = [self.id]

        walker = Walker(self.repository._repo.object_store, include,

                        paths=[path], max_entries=1)

        return [self.repository.get_changeset(sha)

                for sha in (x.commit.id for x in walker)]

    def get_file_annotate(self, path):

        """

        Returns a generator of four element tuples with

            lineno, sha, changeset lazy loader and line

        TODO: This function now uses os underlying 'git' command which is

        generally not good. Should be replaced with algorithm iterating

        commits.

        """

        cmd = 'blame -l --root -r %s -- "%s"' % (self.id, path)

        # -l     ==> outputs long shas (and we need all 40 characters)

        # --root ==> doesn't put '^' character for bounderies

        # -r sha ==> blames for the given revision

        so, se = self.repository.run_git_command(cmd)

        for i, blame_line in enumerate(so.split('\n')[:-1]):

            ln_no = i + 1

            sha, line = re.split(r' ', blame_line, 1)

            yield (ln_no, sha, lambda: self.repository.get_changeset(sha), line)

    def fill_archive(self, stream=None, kind='tgz', prefix=None,

                     subrepos=False):

        """

        Fills up given stream.

        :param stream: file like object.

        :param kind: one of following: ``zip``, ``tgz`` or ``tbz2``.

            Default: ``tgz``.

        :param prefix: name of root directory in archive.

            Default is repository name and changeset's raw_id joined with dash

            (``repo-tip.<KIND>``).

        :param subrepos: include subrepos in this archive.

        :raise ImproperArchiveTypeError: If given kind is wrong.

        :raise VcsError: If given stream is None

        """

        allowed_kinds = settings.ARCHIVE_SPECS.keys()

        if kind not in allowed_kinds:

            raise ImproperArchiveTypeError('Archive kind not supported use one'

                'of %s', allowed_kinds)

        if prefix is None:

            prefix = '%s-%s' % (self.repository.name, self.short_id)

        elif prefix.startswith('/'):

            raise VCSError("Prefix cannot start with leading slash")

        elif prefix.strip() == '':

            raise VCSError("Prefix cannot be empty")

        if kind == 'zip':

            frmt = 'zip'

        else:

            frmt = 'tar'

        _git_path = rhodecode.CONFIG.get('git_path', 'git')

        cmd = '%s archive --format=%s --prefix=%s/ %s' % (_git_path,

                                                frmt, prefix, self.raw_id)

        if kind == 'tgz':

            cmd += ' | gzip -9'

        elif kind == 'tbz2':

            cmd += ' | bzip2 -9'

        if stream is None:

            raise VCSError('You need to pass in a valid stream for filling'

                           ' with archival data')

        popen = Popen(cmd, stdout=PIPE, stderr=PIPE, shell=True,

            cwd=self.repository.path)

        buffer_size = 1024 * 8

        chunk = popen.stdout.read(buffer_size)

        while chunk:

            stream.write(chunk)

            chunk = popen.stdout.read(buffer_size)

        # Make sure all descriptors would be read

        popen.communicate()

    def get_nodes(self, path):

        if self._get_kind(path) != NodeKind.DIR:

<%inherit file="/base/base.html"/>

<%def name="title(*args)">

    ${_('%s Files') % c.repo_name}

    %if hasattr(c,'file'):

    %endif

    · ${c.rhodecode_name}

</%def>

<%def name="breadcrumbs_links()">

    ${_('Files')}

    %if c.file:

        @ ${h.show_id(c.changeset)}

    %endif

</%def>

<%def name="page_nav()">

    ${self.menu('repositories')}

</%def>

<%def name="main()">

${self.context_bar('files')}

<div class="box">

    <!-- box / title -->

    <div class="title">

        ${self.breadcrumbs()}

        <ul class="links">

            <li>

              <span style="text-transform: uppercase;"><a href="#">${_('Branch')}: ${c.changeset.branch}</a></span>

            </li>

        </ul>

    </div>

    <div class="table">

        <div id="files_data">

            <%include file='files_ypjax.html'/>

        </div>

    </div>

</div>

<script type="text/javascript">

var CACHE = {};

var CACHE_EXPIRE = 5*60*1000; //cache for 5*60s

//used to construct links from the search list

var url_base = '${h.url("files_home",repo_name=c.repo_name,revision='__REV__',f_path='__FPATH__')}';

//send the nodelist request to this url

var node_list_url = '${h.url("files_nodelist_home",repo_name=c.repo_name,revision='__REV__',f_path='__FPATH__')}';

// send the node history requst to this url

var node_history_url = '${h.url("files_history_home",repo_name=c.repo_name,revision='__REV__',f_path='__FPATH__')}';

var ypjax_links = function(){

    YUE.on(YUQ('.ypjax-link'), 'click',function(e){

        //don't do ypjax on middle click

        if(e.which == 2 || !History.enabled){

            return true;

        }

        var el = e.currentTarget;

        var url = el.href;

        var _base_url = '${h.url("files_home",repo_name=c.repo_name,revision='',f_path='')}';

        _base_url = _base_url.replace('//','/')

        //extract rev and the f_path from url.

        parts = url.split(_base_url)

        if(parts.length != 2){

            return false;

        }

        var parts2 = parts[1].split('/');

        var rev = parts2.shift(); // pop the first element which is the revision

        var f_path = parts2.join('/');

        //page title make this consistent with title() mako function on top

        var title = "${_('%s Files') % c.repo_name}" + " · " + (f_path || '\\') + " · " + "${c.rhodecode_name}";

        var _node_list_url = node_list_url.replace('__REV__',rev).replace('__FPATH__', f_path);

        var _url_base = url_base.replace('__REV__',rev);

        // Change our States and save some data for handling events

        var data = {url:url,title:title, url_base:_url_base,

                    node_list_url:_node_list_url, rev:rev, f_path:f_path};

        History.pushState(data, title, url);

        //now we're sure that we can do ypjax things

        YUE.preventDefault(e);

        return false;

    });

}

var callbacks = function(State){

    ypjax_links();

    tooltip_activate();

    fileBrowserListeners(State.url, State.data.node_list_url, State.data.url_base);

    if(YUD.get('hlcode')){

        YUE.on('hlcode', 'mouseup', getSelectionLink);

    }

    //console.log(State);

    if(YUD.get('load_node_history')){

      //remove all listeners due to problems of history state