# Copyright (C) 2005 Canonical Ltd
#
# 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 .errors import BzrError
from .inventory import Inventory

START_MARK = "# bzr inventory format 3\n"
END_MARK = "# end of inventory\n"


def escape(s):
    """Very simple URL-like escaping.

    (Why not just use backslashes?  Because then we couldn't parse
    lines just by splitting on spaces.)"""
    return (
        s.replace("\\", r"\x5c")
        .replace(" ", r"\x20")
        .replace("\t", r"\x09")
        .replace("\n", r"\x0a")
    )


def unescape(s):
    if s.find(" ") != -1:
        raise AssertionError()
    s = (
        s.replace(r"\x20", " ")
        .replace(r"\x09", "\t")
        .replace(r"\x0a", "\n")
        .replace(r"\x5c", "\\")
    )

    # TODO: What if there's anything else?

    return s


def write_text_inventory(inv, outf):
    """Write out inv in a simple trad-unix text format."""
    outf.write(START_MARK)
    for path, ie in inv.iter_entries():
        if inv.is_root(ie.file_id):
            continue

        outf.write(ie.file_id + " ")
        outf.write(escape(ie.name) + " ")
        outf.write(ie.kind + " ")
        outf.write(ie.parent_id + " ")

        if ie.kind == "file":
            outf.write(ie.text_id)
            outf.write(" " + ie.text_sha1)
            outf.write(" " + str(ie.text_size))
        outf.write("\n")
    outf.write(END_MARK)


def read_text_inventory(tf):
    """Return an inventory read in from tf"""
    if tf.readline() != START_MARK:
        raise BzrError("missing start mark")

    inv = Inventory()

    for l in tf:
        fields = l.split(" ")
        if fields[0] == "#":
            break
        ie = {
            "file_id": fields[0],
            "name": unescape(fields[1]),
            "kind": fields[2],
            "parent_id": fields[3],
        }
        # inv.add(ie)

    if l != END_MARK:
        raise BzrError("missing end mark")
    return inv
