# -*- coding: utf-8 -*-

"""

    vcs.backends.hg.repository

    ~~~~~~~~~~~~~~~~~~~~~~~~~~

    Mercurial repository implementation.

    :created_on: Apr 8, 2010

    :copyright: (c) 2010-2011 by Marcin Kuzminski, Lukasz Balcerzak.

"""

import datetime

import logging

import os

import time

import urllib

import urllib2

from collections import OrderedDict

import mercurial.commands

import mercurial.error

import mercurial.exchange

import mercurial.hg

import mercurial.hgweb

import mercurial.httppeer

import mercurial.match

import mercurial.mdiff

import mercurial.node

import mercurial.patch

import mercurial.scmutil

import mercurial.sshpeer

import mercurial.tags

import mercurial.ui

import mercurial.url

import mercurial.util

from kallithea.lib.vcs.backends.base import BaseRepository, CollectionGenerator

from kallithea.lib.vcs.exceptions import (

    BranchDoesNotExistError, ChangesetDoesNotExistError, EmptyRepositoryError, RepositoryError, TagAlreadyExistError, TagDoesNotExistError, VCSError)

from kallithea.lib.vcs.utils import ascii_str, author_email, author_name, date_fromtimestamp, makedate, safe_bytes, safe_str, safe_unicode

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

from kallithea.lib.vcs.utils.paths import abspath

from .changeset import MercurialChangeset

from .inmemory import MercurialInMemoryChangeset

from .workdir import MercurialWorkdir

log = logging.getLogger(__name__)

class MercurialRepository(BaseRepository):

    """

    Mercurial repository backend

    """

    DEFAULT_BRANCH_NAME = 'default'

    scm = 'hg'

    def __init__(self, repo_path, create=False, baseui=None, src_url=None,

                 update_after_clone=False):

        """

        Raises RepositoryError if repository could not be find at the given

        ``repo_path``.

        :param repo_path: local path of the repository

        :param create=False: if set to True, would try to create repository if

           it does not exist rather than raising exception

        :param baseui=None: user data

        :param src_url=None: would try to clone repository from given location

        :param update_after_clone=False: sets update of working copy after

          making a clone

        """

        if not isinstance(repo_path, str):

            raise VCSError('Mercurial backend requires repository path to '

                           'be instance of <str> got %s instead' %

                           type(repo_path))

        self.path = abspath(repo_path)

        self.baseui = baseui or mercurial.ui.ui()

        # We've set path and ui, now we can set _repo itself

        self._repo = self._get_repo(create, src_url, update_after_clone)

    @property

    def _empty(self):

        """

        Checks if repository is empty ie. without any changesets

        """

        # TODO: Following raises errors when using InMemoryChangeset...

        # return len(self._repo.changelog) == 0

        return len(self.revisions) == 0

    @LazyProperty

    def revisions(self):

        """

        Returns list of revisions' ids, in ascending order.  Being lazy

        attribute allows external tools to inject shas from cache.

        """

        return self._get_all_revisions()

    @LazyProperty

    def name(self):

        return os.path.basename(self.path)

    @LazyProperty

    def branches(self):

        return self._get_branches()

    @LazyProperty

    def closed_branches(self):

        return self._get_branches(normal=False, closed=True)

    @LazyProperty

    def allbranches(self):

        """

        List all branches, including closed branches.

        """

        return self._get_branches(closed=True)

    def _get_branches(self, normal=True, closed=False):

        """

        Gets branches for this repository

        Returns only not closed branches by default

        :param closed: return also closed branches for mercurial

        :param normal: return also normal branches

        """

        if self._empty:

            return {}

        bt = OrderedDict()

        for bn, _heads, node, isclosed in sorted(self._repo.branchmap().iterbranches()):

            if isclosed:

                if closed:

                    bt[safe_unicode(bn)] = ascii_str(mercurial.node.hex(node))

            else:

                if normal:

                    bt[safe_unicode(bn)] = ascii_str(mercurial.node.hex(node))

        return bt

    @LazyProperty

    def tags(self):

        """

        Gets tags for this repository

        """

        return self._get_tags()

    def _get_tags(self):

        if self._empty:

            return {}

        return OrderedDict(sorted(

            ((safe_unicode(n), ascii_str(mercurial.node.hex(h))) for n, h in self._repo.tags().items()),

            reverse=True,

            key=lambda x: x[0],  # sort by name

        ))

    def tag(self, name, user, revision=None, message=None, date=None,

            **kwargs):

        """

        Creates and returns a tag for the given ``revision``.

        :param name: name for new tag

        :param user: full username, i.e.: "Joe Doe <joe.doe@example.com>"

        :param revision: changeset id for which new tag would be created

        :param message: message of the tag's commit

        :param date: date of tag's commit

        :raises TagAlreadyExistError: if tag with same name already exists

        """

        if name in self.tags:

            raise TagAlreadyExistError("Tag %s already exists" % name)

        changeset = self.get_changeset(revision)

        local = kwargs.setdefault('local', False)

        if message is None:

            message = "Added tag %s for changeset %s" % (name,

                changeset.short_id)

        if date is None:

            date = safe_bytes(datetime.datetime.now().strftime('%a, %d %b %Y %H:%M:%S'))

        try:

            mercurial.tags.tag(self._repo, safe_bytes(name), changeset._ctx.node(), safe_bytes(message), local, safe_bytes(user), date)

        except mercurial.error.Abort as e:

            raise RepositoryError(e.message)

        # Reinitialize tags

        self.tags = self._get_tags()

        tag_id = self.tags[name]

        return self.get_changeset(revision=tag_id)

    def remove_tag(self, name, user, message=None, date=None):

        """

        Removes tag with the given ``name``.

        :param name: name of the tag to be removed

        :param user: full username, i.e.: "Joe Doe <joe.doe@example.com>"

        :param message: message of the tag's removal commit

        :param date: date of tag's removal commit

        :raises TagDoesNotExistError: if tag with given name does not exists

        """

        if name not in self.tags:

            raise TagDoesNotExistError("Tag %s does not exist" % name)

        if message is None:

            message = "Removed tag %s" % name

        if date is None:

            date = safe_bytes(datetime.datetime.now().strftime('%a, %d %b %Y %H:%M:%S'))

        local = False

        try:

            mercurial.tags.tag(self._repo, safe_bytes(name), mercurial.commands.nullid, safe_bytes(message), local, safe_bytes(user), date)

            self.tags = self._get_tags()

        except mercurial.error.Abort as e:

            raise RepositoryError(e.message)

    @LazyProperty

    def bookmarks(self):

        """

        Gets bookmarks for this repository

        """

        return self._get_bookmarks()

    def _get_bookmarks(self):

        if self._empty:

            return {}

        return OrderedDict(sorted(

            ((safe_unicode(n), ascii_str(h)) for n, h in self._repo._bookmarks.items()),

            reverse=True,

            key=lambda x: x[0],  # sort by name

        ))

    def _get_all_revisions(self):

        return [ascii_str(self._repo[x].hex()) for x in self._repo.filtered(b'visible').changelog.revs()]

    def get_diff(self, rev1, rev2, path='', ignore_whitespace=False,

                  context=3):

        """

        Returns (git like) *diff*, as plain text. Shows changes introduced by

        ``rev2`` since ``rev1``.

        :param rev1: Entry point from which diff is shown. Can be

          ``self.EMPTY_CHANGESET`` - in this case, patch showing all

          the changes since empty state of the repository until ``rev2``

        :param rev2: Until which revision changes should be shown.

        :param ignore_whitespace: If set to ``True``, would not show whitespace

          changes. Defaults to ``False``.

        :param context: How many lines before/after changed lines should be

          shown. Defaults to ``3``. If negative value is passed-in, it will be

          set to ``0`` instead.

        """

        # Negative context values make no sense, and will result in

        # errors. Ensure this does not happen.

        if context < 0:

            context = 0

        if hasattr(rev1, 'raw_id'):

            rev1 = getattr(rev1, 'raw_id')

        if hasattr(rev2, 'raw_id'):

            rev2 = getattr(rev2, 'raw_id')

        # Check if given revisions are present at repository (may raise

        # ChangesetDoesNotExistError)

        if rev1 != self.EMPTY_CHANGESET:

            self.get_changeset(rev1)

        self.get_changeset(rev2)

        if path:

            file_filter = mercurial.match.exact(path)

        else:

            file_filter = None

        return b''.join(mercurial.patch.diff(self._repo, rev1, rev2, match=file_filter,

                          opts=mercurial.mdiff.diffopts(git=True,

                                        showfunc=True,

                                        ignorews=ignore_whitespace,

                                        context=context)))

    @classmethod

    def _check_url(cls, url, repoui=None):

        """

        Function will check given url and try to verify if it's a valid

        link. Sometimes it may happened that mercurial will issue basic

        auth request that can cause whole API to hang when used from python

        or other external calls.

        On failures it'll raise urllib2.HTTPError, exception is also thrown

        when the return code is non 200

        """

        # check first if it's not an local url

        if os.path.isdir(url) or url.startswith(b'file:'):

            return True

        if url.startswith(b'ssh:'):

            # in case of invalid uri or authentication issues, sshpeer will

            # throw an exception.

            mercurial.sshpeer.instance(repoui or mercurial.ui.ui(), url, False).lookup(b'tip')

            return True

        url_prefix = None

        if b'+' in url[:url.find(b'://')]:

            url_prefix, url = url.split(b'+', 1)

        handlers = []

        url_obj = mercurial.util.url(url)

        test_uri, authinfo = url_obj.authinfo()

        url_obj.passwd = b'*****'

        cleaned_uri = str(url_obj)

        if authinfo:

            # create a password manager

            passmgr = urllib2.HTTPPasswordMgrWithDefaultRealm()

            passmgr.add_password(*authinfo)

            handlers.extend((mercurial.url.httpbasicauthhandler(passmgr),

                             mercurial.url.httpdigestauthhandler(passmgr)))

        o = urllib2.build_opener(*handlers)

        o.addheaders = [('Content-Type', 'application/mercurial-0.1'),

                        ('Accept', 'application/mercurial-0.1')]

        req = urllib2.Request(

            "%s?%s" % (

                test_uri,

                urllib.urlencode({

                    'cmd': 'between',

                    'pairs': "%s-%s" % ('0' * 40, '0' * 40),

                })

            ))

        try:

            resp = o.open(req)

            if resp.code != 200:

                raise Exception('Return Code is not 200')

        except Exception as e:

            # means it cannot be cloned

            raise urllib2.URLError("[%s] org_exc: %s" % (cleaned_uri, e))

        if not url_prefix: # skip svn+http://... (and git+... too)

            # now check if it's a proper hg repo

            try:

                mercurial.httppeer.instance(repoui or mercurial.ui.ui(), url, False).lookup(b'tip')

            except Exception as e:

                raise urllib2.URLError(

                    "url [%s] does not look like an hg repo org_exc: %s"

                    % (cleaned_uri, e))

        return True

    def _get_repo(self, create, src_url=None, update_after_clone=False):

        """

        Function will check for mercurial repository in given path and return

        a localrepo object. If there is no repository in that path it will

        raise an exception unless ``create`` parameter is set to True - in

        that case repository would be created and returned.

        If ``src_url`` is given, would try to clone repository from the

        location at given clone_point. Additionally it'll make update to

        working copy accordingly to ``update_after_clone`` flag

        """

        try:

            if src_url:

                url = safe_bytes(self._get_url(src_url))

                opts = {}

                if not update_after_clone:

                    opts.update({'noupdate': True})

                MercurialRepository._check_url(url, self.baseui)

                mercurial.commands.clone(self.baseui, url, safe_bytes(self.path), **opts)

                # Don't try to create if we've already cloned repo

                create = False

            return mercurial.localrepo.instance(self.baseui, safe_bytes(self.path), create=create)

        except (mercurial.error.Abort, mercurial.error.RepoError) as err:

            if create:

                msg = "Cannot create repository at %s. Original error was %s" \

                    % (self.name, err)

            else:

                msg = "Not valid repository at %s. Original error was %s" \

                    % (self.name, err)

            raise RepositoryError(msg)

    @LazyProperty

    def in_memory_changeset(self):

        return MercurialInMemoryChangeset(self)

    @LazyProperty

    def description(self):

        _desc = self._repo.ui.config(b'web', b'description', None, untrusted=True)

        return safe_unicode(_desc or b'unknown')

    @LazyProperty

    def contact(self):

        return safe_unicode(mercurial.hgweb.common.get_contact(self._repo.ui.config)

                            or b'Unknown')

    @LazyProperty

    def last_change(self):

        """

        Returns last change made on this repository as datetime object

        """

        return date_fromtimestamp(self._get_mtime(), makedate()[1])

    def _get_mtime(self):

        try:

            return time.mktime(self.get_changeset().date.timetuple())

        except RepositoryError: