''' import Git fast-import streams '''
from __future__ import absolute_import

from mercurial import (
    commands,
    encoding,
    error,
    pycompat,
)

from mercurial.i18n import _

from hgext.convert import (
    convcmd,
    hg,
)

from .hgimport import fastimport_source

testedwith = b'5.6.1'
minimumhgversion = b'4.1'

cmdtable = {}
try:
    from mercurial import registrar
    command = registrar.command(cmdtable)
except (ImportError, AttributeError):
    from mercurial import cmdutil
    command = cmdutil.command(cmdtable)

@command(b'fastimport',
         [(b'', b'branchsort', None, _(b'try to sort changesets by branches')),
          (b'', b'datesort', None, _(b'try to sort changesets by date')),
          (b'', b'sourcesort', None, _(b'preserve source changesets order'))],
         _(b'hg fastimport SOURCE ...'),
          norepo=False)

def fastimport(ui, repo, *sources, **opts):
    '''Convert a git fastimport dump into Mercurial changesets.

    Reads a series of SOURCE fastimport dumps and adds the resulting
    changes to the current Mercurial repository.
    '''
    # Would be nice to just call hgext.convert.convcmd.convert() and let
    # it take care of things.  But syntax and semantics are just a
    # little mismatched:
    #   - fastimport takes multiple source paths (mainly because cvs2git
    #     produces 2 dump files)
    #   - fastimport's dest is implicitly the current repo
    #
    # So for the time being, I have copied bits of convert() over here.
    # Boo, hiss.

    if not sources:
        sources = (b'-')

    # assume fastimport metadata (usernames, commit messages) are
    # encoded UTF-8
    convcmd.orig_encoding = encoding.encoding
    encoding.encoding = b'UTF-8'

    # sink is the current repo, src is the list of fastimport streams
    destc = hg.mercurial_sink(ui, b'hg', repo.root)
    srcc = fastimport_source(ui, b'fastimport', repo, sources)

    opts = pycompat.byteskwargs(opts)
    defaultsort = b'branchsort'          # for efficiency and consistency
    sortmodes = (b'branchsort', b'datesort', b'sourcesort')
    sortmode = [m for m in sortmodes if opts.get(m)]
    if len(sortmode) > 1:
        raise error.Abort(_(b'more than one sort mode specified'))
    if sortmode:
        sortmode = sortmode[0]
    else:
        sortmode = defaultsort

    # not implemented: filemap, revmapfile
    revmapfile = destc.revmapfile()
    c = convcmd.converter(ui, srcc, destc, revmapfile, opts)
    c.convert(sortmode)