# Copyright 2009-2010 Gregory P. Ward

# Copyright 2009-2010 Intelerad Medical Systems Incorporated

# Copyright 2010-2011 Fog Creek Software

# Copyright 2010-2011 Unity Technologies

#

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

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

'''setup for largefiles repositories: reposetup'''

from __future__ import absolute_import

import copy

from mercurial.i18n import _

from mercurial import (

    error,

    localrepo,

    match as matchmod,

    scmutil,

)

from . import (

    lfcommands,

    lfutil,

)

def reposetup(ui, repo):

    # wire repositories should be given new wireproto functions

    # by "proto.wirereposetup()" via "hg.wirepeersetupfuncs"

    if not repo.local():

        return

    class lfilesrepo(repo.__class__):

        # the mark to examine whether "repo" object enables largefiles or not

        _largefilesenabled = True

        lfstatus = False

        def status_nolfiles(self, *args, **kwargs):

            return super(lfilesrepo, self).status(*args, **kwargs)

        # When lfstatus is set, return a context that gives the names

        # of largefiles instead of their corresponding standins and

        # identifies the largefiles as always binary, regardless of

        # their actual contents.

        def __getitem__(self, changeid):

            ctx = super(lfilesrepo, self).__getitem__(changeid)

            if self.lfstatus:

                class lfilesctx(ctx.__class__):

                    def files(self):

                        filenames = super(lfilesctx, self).files()

                        return [lfutil.splitstandin(f) or f for f in filenames]

                    def manifest(self):

                        man1 = super(lfilesctx, self).manifest()

                        class lfilesmanifest(man1.__class__):

                            def __contains__(self, filename):

                                orig = super(lfilesmanifest, self).__contains__

                                return (orig(filename) or

                                        orig(lfutil.standin(filename)))

                        man1.__class__ = lfilesmanifest

                        return man1

                    def filectx(self, path, fileid=None, filelog=None):

                        orig = super(lfilesctx, self).filectx

                        try:

                            if filelog is not None:

                                result = orig(path, fileid, filelog)

                            else:

                                result = orig(path, fileid)

                        except error.LookupError:

                            # Adding a null character will cause Mercurial to

                            # identify this as a binary file.

                            if filelog is not None:

                                result = orig(lfutil.standin(path), fileid,

                                              filelog)

                            else:

                                result = orig(lfutil.standin(path), fileid)

                            olddata = result.data

                            result.data = lambda: olddata() + '\0'

                        return result

                ctx.__class__ = lfilesctx

            return ctx

        # Figure out the status of big files and insert them into the

        # appropriate list in the result. Also removes standin files

        # from the listing. Revert to the original status if

        # self.lfstatus is False.

        # XXX large file status is buggy when used on repo proxy.

        # XXX this needs to be investigated.

        @localrepo.unfilteredmethod

        def status(self, node1='.', node2=None, match=None, ignored=False,

                clean=False, unknown=False, listsubrepos=False):

            listignored, listclean, listunknown = ignored, clean, unknown

            orig = super(lfilesrepo, self).status

            if not self.lfstatus:

                return orig(node1, node2, match, listignored, listclean,

                            listunknown, listsubrepos)

            # some calls in this function rely on the old version of status

            self.lfstatus = False

            ctx1 = self[node1]

            ctx2 = self[node2]

            working = ctx2.rev() is None

            parentworking = working and ctx1 == self['.']

            if match is None:

                match = matchmod.always(self.root, self.getcwd())

            wlock = None

            try:

                try:

                    # updating the dirstate is optional

                    # so we don't wait on the lock

                    wlock = self.wlock(False)

                except error.LockError:

                    pass

                # First check if paths or patterns were specified on the

                # command line.  If there were, and they don't match any

                # largefiles, we should just bail here and let super

                # handle it -- thus gaining a big performance boost.

                lfdirstate = lfutil.openlfdirstate(ui, self)

                if not match.always():

                    for f in lfdirstate:

                        if match(f):

                            break

                    else:

                        return orig(node1, node2, match, listignored, listclean,

                                    listunknown, listsubrepos)

                # Create a copy of match that matches standins instead

                # of largefiles.

                def tostandins(files):

                    if not working:

                        return files

                    newfiles = []

                    dirstate = self.dirstate

                    for f in files:

                        sf = lfutil.standin(f)

                        if sf in dirstate:

                            newfiles.append(sf)

                        elif sf in dirstate.dirs():

                            # Directory entries could be regular or

                            # standin, check both

                            newfiles.extend((f, sf))

                        else:

                            newfiles.append(f)

                    return newfiles

                m = copy.copy(match)

                m._files = tostandins(m._files)

                result = orig(node1, node2, m, ignored, clean, unknown,

                              listsubrepos)

                if working:

                    def sfindirstate(f):

                        sf = lfutil.standin(f)

                        dirstate = self.dirstate

                        return sf in dirstate or sf in dirstate.dirs()

                    match._files = [f for f in match._files

                                    if sfindirstate(f)]

                    # Don't waste time getting the ignored and unknown

                    # files from lfdirstate

                    unsure, s = lfdirstate.status(match, [], False, listclean,

                                                  False)

                    if parentworking:

                        for lfile in unsure:

                            standin = lfutil.standin(lfile)

                            if standin not in ctx1:

                                # from second parent

                                modified.append(lfile)

                            elif ctx1[standin].data().strip() \

                                    != lfutil.hashfile(self.wjoin(lfile)):

                                modified.append(lfile)

                            else:

                                if listclean:

                                    clean.append(lfile)

                                lfdirstate.normal(lfile)

                    else:

                        tocheck = unsure + modified + added + clean

                        modified, added, clean = [], [], []

                        checkexec = self.dirstate._checkexec

                        for lfile in tocheck:

                            standin = lfutil.standin(lfile)

                            if standin in ctx1:

                                abslfile = self.wjoin(lfile)

                                if ((ctx1[standin].data().strip() !=

                                     lfutil.hashfile(abslfile)) or

                                    (checkexec and

                                     ('x' in ctx1.flags(standin)) !=

                                     bool(lfutil.getexecutable(abslfile)))):

                                    modified.append(lfile)

                                elif listclean:

                                    clean.append(lfile)

                            else:

                                added.append(lfile)

                        # at this point, 'removed' contains largefiles

                        # marked as 'R' in the working context.

                        # then, largefiles not managed also in the target

                        # context should be excluded from 'removed'.

                        removed = [lfile for lfile in removed

                                   if lfutil.standin(lfile) in ctx1]

                    for standin in ctx1.walk(lfutil.getstandinmatcher(self)):

                        lfile = lfutil.splitstandin(standin)

                        if not match(lfile):

                            continue

                        if lfile not in lfdirstate:

                    # Filter result lists

                    result = list(result)

                    # Largefiles are not really removed when they're

                    # still in the normal dirstate. Likewise, normal

                    # files are not really removed if they are still in

                    # lfdirstate. This happens in merges where files

                    # change type.

                    removed = [f for f in removed

                               if f not in self.dirstate]

                    result[2] = [f for f in result[2]

                                 if f not in lfdirstate]

                    lfiles = set(lfdirstate._map)

                    # Unknown files

                    result[4] = set(result[4]).difference(lfiles)

                    # Ignored files

                    result[5] = set(result[5]).difference(lfiles)

                    # combine normal files and largefiles

                    normals = [[fn for fn in filelist

                                if not lfutil.isstandin(fn)]

                               for filelist in result]

                                clean)

                    result = [sorted(list1 + list2)

                              for (list1, list2) in zip(normals, lfstatus)]

                else: # not against working directory

                    result = [[lfutil.splitstandin(f) or f for f in items]

                              for items in result]

                if wlock:

                    lfdirstate.write()

            finally:

                if wlock:

                    wlock.release()

            self.lfstatus = True

            return scmutil.status(*result)

        def commitctx(self, ctx, *args, **kwargs):

            node = super(lfilesrepo, self).commitctx(ctx, *args, **kwargs)

            class lfilesctx(ctx.__class__):

                def markcommitted(self, node):

                    orig = super(lfilesctx, self).markcommitted

                    return lfutil.markcommitted(orig, self, node)

            ctx.__class__ = lfilesctx

            return node

        # Before commit, largefile standins have not had their

        # contents updated to reflect the hash of their largefile.

        # Do that here.

        def commit(self, text="", user=None, date=None, match=None,

                force=False, editor=False, extra={}):

            orig = super(lfilesrepo, self).commit

            with self.wlock():

                lfcommithook = self._lfcommithooks[-1]

                match = lfcommithook(self, match)

                result = orig(text=text, user=user, date=date, match=match,

                                force=force, editor=editor, extra=extra)

                return result

        def push(self, remote, force=False, revs=None, newbranch=False):

            if remote.local():

                missing = set(self.requirements) - remote.local().supported

                if missing:

                    msg = _("required features are not"

                            " supported in the destination:"

                            " %s") % (', '.join(sorted(missing)))

                    raise error.Abort(msg)

            return super(lfilesrepo, self).push(remote, force=force, revs=revs,

                newbranch=newbranch)

        # TODO: _subdirlfs should be moved into "lfutil.py", because

        # it is referred only from "lfutil.updatestandinsbymatch"

        def _subdirlfs(self, files, lfiles):

            '''

            Adjust matched file list

            If we pass a directory to commit whose only committable files

            are largefiles, the core commit code aborts before finding

            the largefiles.

            So we do the following:

            For directories that only have largefiles as matches,

            we explicitly add the largefiles to the match list and remove

            the directory.

            In other cases, we leave the match list unmodified.

            '''

            actualfiles = []

            dirs = []

            regulars = []

            for f in files:

                if lfutil.isstandin(f + '/'):

                    raise error.Abort(

                        _('file "%s" is a largefile standin') % f,

                        hint=('commit the largefile itself instead'))

                # Scan directories

                if self.wvfs.isdir(f):

                    dirs.append(f)

                else:

                    regulars.append(f)

            for f in dirs:

                matcheddir = False

                d = self.dirstate.normalize(f) + '/'

                # Check for matched normal files

                for mf in regulars:

                    if self.dirstate.normalize(mf).startswith(d):

                        actualfiles.append(f)

                        matcheddir = True

                        break

                if not matcheddir:

                    # If no normal match, manually append

                    # any matching largefiles

                    for lf in lfiles:

                        if self.dirstate.normalize(lf).startswith(d):

                            actualfiles.append(lf)

                            if not matcheddir:

                                # There may still be normal files in the dir, so

                                # add a directory to the list, which

                                # forces status/dirstate to walk all files and

                                # call the match function on the matcher, even

                                # on case sensitive filesystems.

                                actualfiles.append('.')

                                matcheddir = True

                # Nothing in dir, so readd it

                # and let commit reject it

                if not matcheddir:

                    actualfiles.append(f)

            # Always add normal files

            actualfiles += regulars

            return actualfiles

    repo.__class__ = lfilesrepo

    # stack of hooks being executed before committing.

    # only last element ("_lfcommithooks[-1]") is used for each committing.

    repo._lfcommithooks = [lfutil.updatestandinsbymatch]

    # Stack of status writer functions taking "*msg, **opts" arguments

    # like "ui.status()". Only last element ("_lfstatuswriters[-1]")

    # is used to write status out.

    repo._lfstatuswriters = [ui.status]

    def prepushoutgoinghook(pushop):

        """Push largefiles for pushop before pushing revisions."""

        lfrevs = pushop.lfrevs

        if lfrevs is None:

            lfrevs = pushop.outgoing.missing

        if lfrevs:

            toupload = set()

            addfunc = lambda fn, lfhash: toupload.add(lfhash)

            lfutil.getlfilestoupload(pushop.repo, lfrevs,

                                     addfunc)