from __future__ import absolute_import

import collections

import weakref

from mercurial.i18n import _

from mercurial import (

    bundle2,

    discovery,

    error,

    exchange,

    extensions,

    util,

)

from . import (

    common,

)

try:

    from mercurial import wireproto

    wireproto.branchmap

except (AttributeError, ImportError): # <= hg-4.5

    from mercurial import wireprotov1server as wireproto

def _headssummary(orig, pushop, *args, **kwargs):

    # In mercurial > 4.3, we receive the pushop as arguments

    repo = pushop.repo.unfiltered()

    remote = pushop.remote

    publishing = ('phases' not in remote.listkeys('namespaces')

                  or bool(remote.listkeys('phases').get('publishing', False)))

    if not common.hastopicext(pushop.repo):

        return orig(pushop, *args, **kwargs)

    elif ((publishing or not remote.capable('topics'))

            and not getattr(pushop, 'publish', False)):

        return orig(pushop, *args, **kwargs)

    publishedset = ()

    remotebranchmap = None

    origremotebranchmap = remote.branchmap

    publishednode = [c.node() for c in pushop.outdatedphases]

    publishedset = repo.revs('ancestors(%ln + %ln)',

                             publishednode,

                             pushop.remotephases.publicheads)

    rev = repo.unfiltered().changelog.nodemap.get

    def remotebranchmap():

        # drop topic information from changeset about to be published

        result = collections.defaultdict(list)

        for branch, heads in origremotebranchmap().iteritems():

            if ':' not in branch:

                result[branch].extend(heads)

            else:

                namedbranch = branch.split(':', 1)[0]

                for h in heads:

                    r = rev(h)

                    if r is not None and r in publishedset:

                        result[namedbranch].append(h)

                    else:

                        result[branch].append(h)

        for heads in result.itervalues():

            heads.sort()

        return result

    class repocls(repo.__class__):

        # awful hack to see branch as "branch:topic"

        def __getitem__(self, key):

            ctx = super(repocls, self).__getitem__(key)

            oldbranch = ctx.branch

            rev = ctx.rev()

            def branch():

                branch = oldbranch()

                if rev in publishedset:

                    return branch

                topic = ctx.topic()

                if topic:

                    branch = "%s:%s" % (branch, topic)

                return branch

            ctx.branch = branch

            return ctx

        def revbranchcache(self):

            rbc = super(repocls, self).revbranchcache()

            localchangelog = self.changelog

            def branchinfo(rev, changelog=None):

                if changelog is None:

                    changelog = localchangelog

                branch, close = changelog.branchinfo(rev)

                if rev in publishedset:

                    return branch, close

                topic = repo[rev].topic()

                if topic:

                    branch = "%s:%s" % (branch, topic)

                return branch, close

            rbc.branchinfo = branchinfo

            return rbc

    oldrepocls = repo.__class__

    try:

        repo.__class__ = repocls

        if remotebranchmap is not None:

            remote.branchmap = remotebranchmap

        unxx = repo.filtered('unfiltered-topic')

        repo.unfiltered = lambda: unxx

        pushop.repo = repo

        summary = orig(pushop)

        for key, value in summary.iteritems():

            if ':' in key: # This is a topic

                if value[0] is None and value[1]:

                    summary[key] = ([value[1][0]], ) + value[1:]

        return summary

    finally:

        if 'unfiltered' in vars(repo):

            del repo.unfiltered

        repo.__class__ = oldrepocls

        if remotebranchmap is not None:

            remote.branchmap = origremotebranchmap

def wireprotobranchmap(orig, repo, proto):

    oldrepo = repo.__class__

    try:

        class repocls(repo.__class__):

            def branchmap(self):

                usetopic = not self.publishing()

                return super(repocls, self).branchmap(topic=usetopic)

        repo.__class__ = repocls

        return orig(repo, proto)

    finally:

        repo.__class__ = oldrepo

# Discovery have deficiency around phases, branch can get new heads with pure

# phases change. This happened with a changeset was allowed to be pushed

# because it had a topic, but it later become public and create a new branch

# head.

#

# Handle this by doing an extra check for new head creation server side

def _nbheads(repo):

    data = {}

    for b in repo.branchmap().iterbranches():

        if ':' in b[0]:

            continue

        data[b[0]] = len(b[1])

    return data

def handlecheckheads(orig, op, inpart):

    """This is used to check for new heads when publishing changeset"""

    orig(op, inpart)

    if op.repo.publishing():

        return

    tr = op.gettransaction()

    if tr.hookargs['source'] not in ('push', 'serve'): # not a push

        return

    tr._prepushheads = _nbheads(op.repo)

    reporef = weakref.ref(op.repo)

    if util.safehasattr(tr, 'validator'): # hg <= 4.7

        oldvalidator = tr.validator

    else:

        oldvalidator = tr._validator

    def validator(tr):

        repo = reporef()

        if repo is not None:

            repo.invalidatecaches()

            finalheads = _nbheads(repo)

            for branch, oldnb in tr._prepushheads.iteritems():

                newnb = finalheads.pop(branch, 0)

                if oldnb < newnb:

                    msg = _('push create a new head on branch "%s"' % branch)

                    raise error.Abort(msg)

            for branch, newnb in finalheads.iteritems():

                if 1 < newnb:

                    msg = _('push create more than 1 head on new branch "%s"'

                            % branch)

                    raise error.Abort(msg)

        return oldvalidator(tr)

    if util.safehasattr(tr, 'validator'): # hg <= 4.7

        tr.validator = validator

    else:

        tr._validator = validator

handlecheckheads.params = frozenset()

def _pushb2phases(orig, pushop, bundler):

    checktypes = ('check:heads', 'check:updated-heads')

    hascheck = any(p.type in checktypes for p in bundler._parts)

    if not hascheck and pushop.outdatedphases:

        exchange._pushb2ctxcheckheads(pushop, bundler)

    return orig(pushop, bundler)

def wireprotocaps(orig, repo, proto):

    caps = orig(repo, proto)

    if repo.peer().capable('topics'):

        caps.append('topics')

    return caps

def modsetup(ui):

    """run at uisetup time to install all destinations wrapping"""

    extensions.wrapfunction(discovery, '_headssummary', _headssummary)

    extensions.wrapfunction(wireproto, 'branchmap', wireprotobranchmap)

    extensions.wrapfunction(wireproto, '_capabilities', wireprotocaps)

    # we need a proper wrap b2 part stuff

    extensions.wrapfunction(bundle2, 'handlecheckheads', handlecheckheads)

    bundle2.handlecheckheads.params = frozenset()

    bundle2.parthandlermapping['check:heads'] = bundle2.handlecheckheads

    if util.safehasattr(bundle2, 'handlecheckupdatedheads'):

        # we still need a proper wrap b2 part stuff

        extensions.wrapfunction(bundle2, 'handlecheckupdatedheads', handlecheckheads)

        bundle2.handlecheckupdatedheads.params = frozenset()

        bundle2.parthandlermapping['check:updated-heads'] = bundle2.handlecheckupdatedheads

    extensions.wrapfunction(exchange, '_pushb2phases', _pushb2phases)

    exchange.b2partsgenmapping['phase'] = exchange._pushb2phases