# narrowwirepeer.py - passes narrow spec with unbundle command
#
# Copyright 2017 Google, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

from mercurial import (
    bundle2,
    error,
    extensions,
    hg,
    narrowspec,
    pycompat,
    wireprototypes,
    wireprotov1peer,
    wireprotov1server,
)

from . import narrowbundle2

def uisetup():
    wireprotov1peer.wirepeer.narrow_widen = peernarrowwiden

def reposetup(repo):
    def wirereposetup(ui, peer):
        def wrapped(orig, cmd, *args, **kwargs):
            if cmd == 'unbundle':
                # TODO: don't blindly add include/exclude wireproto
                # arguments to unbundle.
                include, exclude = repo.narrowpats
                kwargs[r"includepats"] = ','.join(include)
                kwargs[r"excludepats"] = ','.join(exclude)
            return orig(cmd, *args, **kwargs)
        extensions.wrapfunction(peer, '_calltwowaystream', wrapped)
    hg.wirepeersetupfuncs.append(wirereposetup)

@wireprotov1server.wireprotocommand('narrow_widen', 'oldincludes oldexcludes'
                                                    ' newincludes newexcludes'
                                                    ' commonheads cgversion'
                                                    ' known ellipses',
                                    permission='pull')
def narrow_widen(repo, proto, oldincludes, oldexcludes, newincludes,
                 newexcludes, commonheads, cgversion, known, ellipses):
    """wireprotocol command to send data when a narrow clone is widen. We will
    be sending a changegroup here.

    The current set of arguments which are required:
    oldincludes: the old includes of the narrow copy
    oldexcludes: the old excludes of the narrow copy
    newincludes: the new includes of the narrow copy
    newexcludes: the new excludes of the narrow copy
    commonheads: list of heads which are common between the server and client
    cgversion(maybe): the changegroup version to produce
    known: list of nodes which are known on the client (used in ellipses cases)
    ellipses: whether to send ellipses data or not
    """

    preferuncompressed = False
    try:
        def splitpaths(data):
            # work around ''.split(',') => ['']
            return data.split(b',') if data else []
        oldincludes = splitpaths(oldincludes)
        newincludes = splitpaths(newincludes)
        oldexcludes = splitpaths(oldexcludes)
        newexcludes = splitpaths(newexcludes)
        # validate the patterns
        narrowspec.validatepatterns(set(oldincludes))
        narrowspec.validatepatterns(set(newincludes))
        narrowspec.validatepatterns(set(oldexcludes))
        narrowspec.validatepatterns(set(newexcludes))

        common = wireprototypes.decodelist(commonheads)
        known = wireprototypes.decodelist(known)
        if ellipses == '0':
            ellipses = False
        else:
            ellipses = bool(ellipses)
        cgversion = cgversion

        bundler = bundle2.bundle20(repo.ui)
        if not ellipses:
            newmatch = narrowspec.match(repo.root, include=newincludes,
                                        exclude=newexcludes)
            oldmatch = narrowspec.match(repo.root, include=oldincludes,
                                        exclude=oldexcludes)
            bundle2.widen_bundle(bundler, repo, oldmatch, newmatch, common,
                                 known, cgversion, ellipses)
        else:
            narrowbundle2.generateellipsesbundle2(bundler, repo, oldincludes,
                    oldexcludes, newincludes, newexcludes, cgversion, common,
                    list(common), known, None)
    except error.Abort as exc:
        bundler = bundle2.bundle20(repo.ui)
        manargs = [('message', pycompat.bytestr(exc))]
        advargs = []
        if exc.hint is not None:
            advargs.append(('hint', exc.hint))
        bundler.addpart(bundle2.bundlepart('error:abort', manargs, advargs))
        preferuncompressed = True

    chunks = bundler.getchunks()
    return wireprototypes.streamres(gen=chunks,
                                    prefer_uncompressed=preferuncompressed)

def peernarrowwiden(remote, **kwargs):
    for ch in (r'commonheads', r'known'):
        kwargs[ch] = wireprototypes.encodelist(kwargs[ch])

    for ch in (r'oldincludes', r'newincludes', r'oldexcludes', r'newexcludes'):
        kwargs[ch] = b','.join(kwargs[ch])

    kwargs[r'ellipses'] = '%i' % bool(kwargs[r'ellipses'])
    f = remote._callcompressable('narrow_widen', **kwargs)
    return bundle2.getunbundler(remote.ui, f)