#!/usr/bin/env python
# Copyright (c) 2013, Eduard Broecker
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification, are permitted provided that
# the following conditions are met:
#
#    Redistributions of source code must retain the above copyright notice, this list of conditions and the
#    following disclaimer.
#    Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
#    following disclaimer in the documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
# DAMAGE.
#
# this script exports yaml-files from a canmatrix-object
# yaml-files are just object-dumps human readable.
# This export is complete, no information lost


from __future__ import absolute_import
from builtins import *

from .canmatrix import *
import copy
import codecs
import yaml

try:
    from yaml.representer import SafeRepresenter
except ImportError:
    yaml = None


representers = False
try:
    yaml.add_representer(int, SafeRepresenter.represent_int)
    yaml.add_representer(long, SafeRepresenter.represent_long)
    yaml.add_representer(unicode, SafeRepresenter.represent_unicode)
    yaml.add_representer(str, SafeRepresenter.represent_unicode)
    yaml.add_representer(list, SafeRepresenter.represent_list)
    representers = True
except:
    representers = False
    # some error with representers ... continue anyway


def dump(db, f, **options):
    newdb = copy.deepcopy(db)

    for i, frame in enumerate(newdb.frames):
        for j, signal in enumerate(frame.signals):
            if signal.is_little_endian == False:
                signal._startbit = signal.getStartbit(
                    bitNumbering=1, startLittle=True)
#                newdb.frames[i].signals[j]._startbit = signal._startbit

#    f = open(filename, "w")
    if representers:
        f.write(unicode(yaml.dump(newdb)))
    else:
        f.write(yaml.dump(newdb).encode('utf8'))


def load(f, **options):
    db = yaml.load(f)
    # TODO: don't close here.  someone else opened, they should close.
    f.close()

    return db


def constructor(loader, node, cls, mapping={}):
    d = {k.lstrip('_'): v for k, v in loader.construct_mapping(node).items()}
    name = d.pop('name')
    for old, new in mapping.items():
        d[new] = d.pop(old)
    return cls(name, **d)


def frame_constructor(loader, node):
    return constructor(
        loader=loader,
        node=node,
        cls=Frame,
        mapping={
            'Transmitter': 'transmitter',
            'Size': 'dlc',
        },
    )


def signal_constructor(loader, node):
    mapping = {
        'startbit': 'startBit',
        'signalsize': 'signalSize',
    }

    signal = constructor(
        loader=loader,
        node=node,
        cls=Signal,
        mapping={
            'startbit': 'startBit',
            'signalsize': 'signalSize',
        },
    )

    if signal.is_little_endian == False:
        signal.setStartbit(
            loader.construct_mapping(node)['_startbit'],
            bitNumbering=1,
            startLittle=False)

    return signal


def frame_representer(dumper, data):
    node = yaml.representer.Representer.represent_object(dumper, data)
    node.tag = '{}:Frame'.format(node.tag.partition(':python/object:')[0])

    return node


yaml.add_constructor(u'tag:yaml.org,2002:Frame', frame_constructor)
yaml.add_constructor(u'tag:yaml.org,2002:Signal', signal_constructor)
yaml.add_representer(Frame, frame_representer)