# Copyright (C) 2017 Breezy Developers
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

from .. import (
    config,
    errors,
    controldir,
    pyutils,
    registry,
    )


class LineEndingError(errors.BzrError):

    _fmt = ("Line ending corrupted for file: %(file)s; "
            "Maybe your files got corrupted in transport?")

    def __init__(self, file):
        self.file = file


class BzrProber(controldir.Prober):
    """Prober for formats that use a .bzr/ control directory."""

    formats = registry.FormatRegistry(controldir.network_format_registry)
    """The known .bzr formats."""

    @classmethod
    def priority(klass, transport):
        return 10

    @classmethod
    def probe_transport(klass, transport):
        """Return the .bzrdir style format present in a directory."""
        try:
            format_string = transport.get_bytes(".bzr/branch-format")
        except errors.NoSuchFile:
            raise errors.NotBranchError(path=transport.base)
        except errors.BadHttpRequest as e:
            if e.reason == 'no such method: .bzr':
                # hgweb 
                raise errors.NotBranchError(path=transport.base)
            raise

        try:
            first_line = format_string[:format_string.index(b"\n") + 1]
        except ValueError:
            first_line = format_string
        if (first_line.startswith(b'<!DOCTYPE') or
                first_line.startswith(b'<html')):
            raise errors.NotBranchError(
                path=transport.base, detail="format file looks like HTML")
        try:
            cls = klass.formats.get(first_line)
        except KeyError:
            if first_line.endswith(b"\r\n"):
                raise LineEndingError(file=".bzr/branch-format")
            else:
                raise errors.UnknownFormatError(
                    format=first_line, kind='bzrdir')
        return cls.from_string(format_string)

    @classmethod
    def known_formats(cls):
        result = []
        for name, format in cls.formats.items():
            if callable(format):
                format = format()
            result.append(format)
        return result


controldir.ControlDirFormat.register_prober(BzrProber)


class RemoteBzrProber(controldir.Prober):
    """Prober for remote servers that provide a Bazaar smart server."""

    @classmethod
    def priority(klass, transport):
        return -10

    @classmethod
    def probe_transport(klass, transport):
        """Return a RemoteBzrDirFormat object if it looks possible."""
        try:
            medium = transport.get_smart_medium()
        except (NotImplementedError, AttributeError,
                errors.TransportNotPossible, errors.NoSmartMedium,
                errors.SmartProtocolError):
            # no smart server, so not a branch for this format type.
            raise errors.NotBranchError(path=transport.base)
        else:
            # Decline to open it if the server doesn't support our required
            # version (3) so that the VFS-based transport will do it.
            if medium.should_probe():
                try:
                    server_version = medium.protocol_version()
                except errors.SmartProtocolError:
                    # Apparently there's no usable smart server there, even though
                    # the medium supports the smart protocol.
                    raise errors.NotBranchError(path=transport.base)
                if server_version != '2':
                    raise errors.NotBranchError(path=transport.base)
            from .remote import RemoteBzrDirFormat
            return RemoteBzrDirFormat()

    @classmethod
    def known_formats(cls):
        from .remote import RemoteBzrDirFormat
        return [RemoteBzrDirFormat()]


controldir.ControlDirFormat.register_prober(RemoteBzrProber)

# Register bzr formats
BzrProber.formats.register_lazy(
    b"Bazaar-NG meta directory, format 1\n",
    __name__ + '.bzrdir', 'BzrDirMetaFormat1')
BzrProber.formats.register_lazy(
    b"Bazaar meta directory, format 1 (with colocated branches)\n",
    __name__ + '.bzrdir', 'BzrDirMetaFormat1Colo')


def register_metadir(registry, key,
                     repository_format, help, native=True, deprecated=False,
                     branch_format=None,
                     tree_format=None,
                     hidden=False,
                     experimental=False,
                     bzrdir_format=None):
    """Register a metadir subformat.

    These all use a meta bzrdir, but can be parameterized by the
    Repository/Branch/WorkingTreeformats.

    :param repository_format: The fully-qualified repository format class
        name as a string.
    :param branch_format: Fully-qualified branch format class name as
        a string.
    :param tree_format: Fully-qualified tree format class name as
        a string.
    """
    if bzrdir_format is None:
        bzrdir_format = 'breezy.bzr.bzrdir.BzrDirMetaFormat1'
    # This should be expanded to support setting WorkingTree and Branch
    # formats, once the API supports that.

    def _load(full_name):
        mod_name, factory_name = full_name.rsplit('.', 1)
        try:
            factory = pyutils.get_named_object(mod_name, factory_name)
        except ImportError as e:
            raise ImportError('failed to load %s: %s' % (full_name, e))
        except AttributeError:
            raise AttributeError('no factory %s in module %r'
                                 % (full_name, sys.modules[mod_name]))
        return factory()

    def helper():
        bd = _load(bzrdir_format)
        if branch_format is not None:
            bd.set_branch_format(_load(branch_format))
        if tree_format is not None:
            bd.workingtree_format = _load(tree_format)
        if repository_format is not None:
            bd.repository_format = _load(repository_format)
        return bd
    registry.register(key, helper, help, native, deprecated, hidden,
                      experimental)


register_metadir(
    controldir.format_registry, 'knit',
    'breezy.bzr.knitrepo.RepositoryFormatKnit1',
    'Format using knits.  Recommended for interoperation with bzr <= 0.14.',
    branch_format='breezy.bzr.fullhistory.BzrBranchFormat5',
    tree_format='breezy.bzr.workingtree_3.WorkingTreeFormat3',
    hidden=True,
    deprecated=True)
register_metadir(
    controldir.format_registry, 'dirstate',
    'breezy.bzr.knitrepo.RepositoryFormatKnit1',
    help='Format using dirstate for working trees. '
    'Compatible with bzr 0.8 and '
    'above when accessed over the network. Introduced in bzr 0.15.',
    branch_format='breezy.bzr.fullhistory.BzrBranchFormat5',
    tree_format='breezy.bzr.workingtree_4.WorkingTreeFormat4',
    hidden=True,
    deprecated=True)
register_metadir(
    controldir.format_registry, 'dirstate-tags',
    'breezy.bzr.knitrepo.RepositoryFormatKnit1',
    help='Variant of dirstate with support for tags. '
    'Introduced in bzr 0.15.',
    branch_format='breezy.bzr.branch.BzrBranchFormat6',
    tree_format='breezy.bzr.workingtree_4.WorkingTreeFormat4',
    hidden=True,
    deprecated=True)
register_metadir(
    controldir.format_registry, 'rich-root',
    'breezy.bzr.knitrepo.RepositoryFormatKnit4',
    help='Variant of dirstate with better handling of tree roots. '
    'Introduced in bzr 1.0.',
    branch_format='breezy.bzr.branch.BzrBranchFormat6',
    tree_format='breezy.bzr.workingtree_4.WorkingTreeFormat4',
    hidden=True,
    deprecated=True)
register_metadir(
    controldir.format_registry, 'dirstate-with-subtree',
    'breezy.bzr.knitrepo.RepositoryFormatKnit3',
    help='Variant of dirstate with support for nested trees. '
    'Introduced in 0.15.',
    branch_format='breezy.bzr.branch.BzrBranchFormat6',
    tree_format='breezy.bzr.workingtree_4.WorkingTreeFormat4',
    experimental=True,
    hidden=True,
    )
register_metadir(
    controldir.format_registry, 'pack-0.92',
    'breezy.bzr.knitpack_repo.RepositoryFormatKnitPack1',
    help='Pack-based format used in 1.x series. Introduced in 0.92. '
    'Interoperates with bzr repositories before 0.92 but cannot be '
    'read by bzr < 0.92.',
    branch_format='breezy.bzr.branch.BzrBranchFormat6',
    tree_format='breezy.bzr.workingtree_4.WorkingTreeFormat4',
    deprecated=True,
    hidden=True,
    )
register_metadir(
    controldir.format_registry, 'pack-0.92-subtree',
    'breezy.bzr.knitpack_repo.RepositoryFormatKnitPack3',
    help='Pack-based format used in 1.x series, with subtree support. '
    'Introduced in 0.92. Interoperates with '
    'bzr repositories before 0.92 but cannot be read by bzr < 0.92.',
    branch_format='breezy.bzr.branch.BzrBranchFormat6',
    tree_format='breezy.bzr.workingtree_4.WorkingTreeFormat4',
    hidden=True,
    deprecated=True,
    experimental=True,
    )
register_metadir(
    controldir.format_registry, 'rich-root-pack',
    'breezy.bzr.knitpack_repo.RepositoryFormatKnitPack4',
    help='A variant of pack-0.92 that supports rich-root data '
    '(needed for bzr-svn and bzr-git). Introduced in 1.0.',
    branch_format='breezy.bzr.branch.BzrBranchFormat6',
    tree_format='breezy.bzr.workingtree_4.WorkingTreeFormat4',
    hidden=True,
    deprecated=True,
    )
register_metadir(
    controldir.format_registry, '1.6',
    'breezy.bzr.knitpack_repo.RepositoryFormatKnitPack5',
    help='A format that allows a branch to indicate that there is another '
    '(stacked) repository that should be used to access data that is '
    'not present locally.',
    branch_format='breezy.bzr.branch.BzrBranchFormat7',
    tree_format='breezy.bzr.workingtree_4.WorkingTreeFormat4',
    hidden=True,
    deprecated=True,
    )
register_metadir(
    controldir.format_registry, '1.6.1-rich-root',
    'breezy.bzr.knitpack_repo.RepositoryFormatKnitPack5RichRoot',
    help='A variant of 1.6 that supports rich-root data '
    '(needed for bzr-svn and bzr-git).',
    branch_format='breezy.bzr.branch.BzrBranchFormat7',
    tree_format='breezy.bzr.workingtree_4.WorkingTreeFormat4',
    hidden=True,
    deprecated=True,
    )
register_metadir(
    controldir.format_registry, '1.9',
    'breezy.bzr.knitpack_repo.RepositoryFormatKnitPack6',
    help='A repository format using B+tree indexes. These indexes '
    'are smaller in size, have smarter caching and provide faster '
    'performance for most operations.',
    branch_format='breezy.bzr.branch.BzrBranchFormat7',
    tree_format='breezy.bzr.workingtree_4.WorkingTreeFormat4',
    hidden=True,
    deprecated=True,
    )
register_metadir(
    controldir.format_registry, '1.9-rich-root',
    'breezy.bzr.knitpack_repo.RepositoryFormatKnitPack6RichRoot',
    help='A variant of 1.9 that supports rich-root data '
    '(needed for bzr-svn and bzr-git).',
    branch_format='breezy.bzr.branch.BzrBranchFormat7',
    tree_format='breezy.bzr.workingtree_4.WorkingTreeFormat4',
    hidden=True,
    deprecated=True,
    )
register_metadir(
    controldir.format_registry, '1.14',
    'breezy.bzr.knitpack_repo.RepositoryFormatKnitPack6',
    help='A working-tree format that supports content filtering.',
    branch_format='breezy.bzr.branch.BzrBranchFormat7',
    tree_format='breezy.bzr.workingtree_4.WorkingTreeFormat5',
    hidden=True,
    deprecated=True,
    )
register_metadir(
    controldir.format_registry, '1.14-rich-root',
    'breezy.bzr.knitpack_repo.RepositoryFormatKnitPack6RichRoot',
    help='A variant of 1.14 that supports rich-root data '
    '(needed for bzr-svn and bzr-git).',
    branch_format='breezy.bzr.branch.BzrBranchFormat7',
    tree_format='breezy.bzr.workingtree_4.WorkingTreeFormat5',
    hidden=True,
    deprecated=True,
    )
# The following un-numbered 'development' formats should always just be aliases.
register_metadir(
    controldir.format_registry, 'development-subtree',
    'breezy.bzr.groupcompress_repo.RepositoryFormat2aSubtree',
    help='Current development format, subtree variant. Can convert data to and '
         'from pack-0.92-subtree (and anything compatible with '
         'pack-0.92-subtree) format repositories. Repositories and branches in '
         'this format can only be read by bzr.dev. Please read '
         'https://www.breezy-vcs.org/developers/development-repo.html '
         'before use.',
    branch_format='breezy.bzr.branch.BzrBranchFormat8',
    tree_format='breezy.bzr.workingtree_4.WorkingTreeFormat6',
    experimental=True,
    hidden=True,
    )
register_metadir(
    controldir.format_registry, 'development5-subtree',
    'breezy.bzr.knitpack_repo.RepositoryFormatPackDevelopment2Subtree',
    help='Development format, subtree variant. Can convert data to and '
    'from pack-0.92-subtree (and anything compatible with '
    'pack-0.92-subtree) format repositories. Repositories and branches in '
    'this format can only be read by bzr.dev. Please read '
    'https://www.breezy-vcs.org/developers/development-repo.html '
    'before use.',
    branch_format='breezy.bzr.branch.BzrBranchFormat7',
    tree_format='breezy.bzr.workingtree_4.WorkingTreeFormat6',
    experimental=True,
    hidden=True,
    )

register_metadir(
    controldir.format_registry, 'development-colo',
    'breezy.bzr.groupcompress_repo.RepositoryFormat2a',
    help='The 2a format with experimental support for colocated branches.\n',
    branch_format='breezy.bzr.branch.BzrBranchFormat7',
    tree_format='breezy.bzr.workingtree_4.WorkingTreeFormat6',
    experimental=True,
    bzrdir_format='breezy.bzr.bzrdir.BzrDirMetaFormat1Colo',
    hidden=True,
    )


# And the development formats above will have aliased one of the following:

# Finally, the current format.
register_metadir(controldir.format_registry, '2a',
                 'breezy.bzr.groupcompress_repo.RepositoryFormat2a',
                 help='Format for the bzr 2.0 series.\n',
                 branch_format='breezy.bzr.branch.BzrBranchFormat7',
                 tree_format='breezy.bzr.workingtree_4.WorkingTreeFormat6',
                 experimental=False,
                 )

# The following format should be an alias for the rich root equivalent
# of the default format

controldir.format_registry.register_alias(
    'default-rich-root', '2a', hidden=True)

# The following format should is just an alias for the default bzr format.
controldir.format_registry.register_alias('bzr', '2a')

# The current format that is made on 'bzr init'.
format_name = config.GlobalStack().get('default_format')
controldir.format_registry.set_default(format_name)
