# Copyright 2017 Octobus <contact@octobus.net>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

"""

Compatibility module

"""

from mercurial import (

    context,

    hg,

    obsolete,

    revset,

    util,

)

try:

    from mercurial import obsutil

    obsutil.closestpredecessors

except ImportError:

    obsutil = None

from . import (

    exthelper,

)

eh = exthelper.exthelper()

if not util.safehasattr(hg, '_copycache'):

    # exact copy of relevantmarkers as in Mercurial-176d1a0ce385

    # this fixes relevant markers computation for version < hg-4.3

    @eh.wrapfunction(obsolete.obsstore, 'relevantmarkers')

    def relevantmarkers(orig, self, nodes):

        """return a set of all obsolescence markers relevant to a set of nodes.

        "relevant" to a set of nodes mean:

        - marker that use this changeset as successor

        - prune marker of direct children on this changeset

        - recursive application of the two rules on precursors of these markers

        It is a set so you cannot rely on order.

        Backport of mercurial changeset 176d1a0ce385 for version < 4.3

        """

        pendingnodes = set(nodes)

        seenmarkers = set()

        seennodes = set(pendingnodes)

        precursorsmarkers = self.predecessors

        succsmarkers = self.successors

        children = self.children

        while pendingnodes:

            direct = set()

            for current in pendingnodes:

                direct.update(precursorsmarkers.get(current, ()))

                pruned = [m for m in children.get(current, ()) if not m[1]]

                direct.update(pruned)

                pruned = [m for m in succsmarkers.get(current, ()) if not m[1]]

                direct.update(pruned)

            direct -= seenmarkers

            pendingnodes = set([m[0] for m in direct])

            seenmarkers |= direct

            pendingnodes -= seennodes

            seennodes |= pendingnodes

        return seenmarkers

# successors set move from mercurial.obsolete to mercurial.obsutil in 4.3

def successorssets(*args, **kwargs):

    func = getattr(obsutil, 'successorssets', None)

    if func is None:

        func = obsolete.successorssets

    return func(*args, **kwargs)

# allprecursors set move from mercurial.obsolete to mercurial.obsutil in 4.3

# allprecursors  was renamed into allpredecessors in 4.4

def allprecursors(*args, **kwargs):

    func = getattr(obsutil, 'allpredecessors', None)

    if func is None:

        func = getattr(obsutil, 'allprecursors', None)

        if func is None:

            func = obsolete.allprecursors

    return func(*args, **kwargs)

# compatibility layer for mercurial < 4.3

def bookmarkapplychanges(repo, tr, changes):

    """Apply a list of changes to bookmarks

    """

    bookmarks = repo._bookmarks

    if util.safehasattr(bookmarks, 'applychanges'):

        return bookmarks.applychanges(repo, tr, changes)

    for name, node in changes:

        if node is None:

            del bookmarks[name]

        else:

            bookmarks[name] = node

    bookmarks.recordchange(tr)

# Evolution renaming compat

TROUBLES = {}

if not util.safehasattr(context.basectx, 'orphan'):

    TROUBLES['ORPHAN'] = 'unstable'

    context.basectx.orphan = context.basectx.unstable

else:

    TROUBLES['ORPHAN'] = 'orphan'

if not util.safehasattr(context.basectx, 'contentdivergent'):

    context.basectx.contentdivergent = context.basectx.divergent

if not util.safehasattr(context.basectx, 'phasedivergent'):

    context.basectx.phasedivergent = context.basectx.bumped

if not util.safehasattr(context.basectx, 'isunstable'):

    context.basectx.isunstable = context.basectx.troubled

if not util.safehasattr(revset, 'orphan'):

    @eh.revset('orphan')

    def oprhanrevset(*args, **kwargs):

        return revset.unstable(*args, **kwargs)

if not util.safehasattr(revset, 'contentdivergent'):

    @eh.revset('contentdivergent')

    def contentdivergentrevset(*args, **kwargs):

        return revset.divergent(*args, **kwargs)

if not util.safehasattr(revset, 'phasedivergent'):

    @eh.revset('phasedivergent')

    def phasedivergentrevset(*args, **kwargs):

        return revset.bumped(*args, **kwargs)

if not util.safehasattr(context.basectx, 'instabilities'):

    def instabilities(self):

        """return the list of instabilities affecting this changeset.

        Instabilities are returned as strings. possible values are:

         - orphan,

         - phase-divergent,

         - content-divergent.

         """

        instabilities = []

        if self.orphan():

            instabilities.append('orphan')

        if self.phasedivergent():

            instabilities.append('phase-divergent')

        if self.contentdivergent():

            instabilities.append('content-divergent')

        return instabilities

    context.basectx.instabilities = instabilities

# XXX: Better detection of property cache

if 'predecessors' not in dir(obsolete.obsstore):

    @property

    def predecessors(self):

        return self.precursors

    obsolete.obsstore.predecessors = predecessors

if not util.safehasattr(obsolete, '_computeorphanset'):

    obsolete._computeorphanset = obsolete.cachefor('orphan')(obsolete._computeunstableset)

if not util.safehasattr(obsolete, '_computecontentdivergentset'):

    obsolete._computecontentdivergentset = obsolete.cachefor('contentdivergent')(obsolete._computedivergentset)

if not util.safehasattr(obsolete, '_computephasedivergentset'):

    obsolete._computephasedivergentset = obsolete.cachefor('phasedivergent')(obsolete._computebumpedset)