#
# Copyright (c) 2002, 2003, 2004 Art Haas
#
# This file is part of PythonCAD.
# 
# PythonCAD 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.
# 
# PythonCAD 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 PythonCAD; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
#
# Deleting objects
#

from PythonCAD.Generic.point import Point
from PythonCAD.Generic.segment import Segment
from PythonCAD.Generic.circle import Circle
from PythonCAD.Generic.arc import Arc
from PythonCAD.Generic.hcline import HCLine
from PythonCAD.Generic.vcline import VCLine
from PythonCAD.Generic.acline import ACLine
from PythonCAD.Generic.segjoint import Chamfer, Fillet
from PythonCAD.Generic.cline import CLine
from PythonCAD.Generic.ccircle import CCircle
from PythonCAD.Generic.leader import Leader
from PythonCAD.Generic.polyline import Polyline
from PythonCAD.Generic.text import TextBlock

def delete_objects(layer, objlist):
    """Remove a list of objects from a Layer.

delete_objects(objlist)

The objlist argument must be a list containing objects stored
within the layer.
    """
    if not isinstance(objlist, list):
        raise TypeError, "Invalid object list: " + `objlist`
    for _obj in objlist:
        _lobj = layer.findObject(_obj)
        if _lobj is not _obj:
            raise ValueError, "Object not found in layer: " + `_obj`
    _objdict = {}
    for _obj in objlist:
        _objdict[id(_obj)] = True
    for _obj in objlist:
        if isinstance(_obj, Point):
            continue
        elif isinstance(_obj, Segment):
            _p1, _p2 = _obj.getEndpoints()
            _pid = id(_p1)
            if _pid in _objdict:
                _objdict[_pid] = False
            _pid = id(_p2)
            if _pid in _objdict:
                _objdict[_pid] = False
        elif isinstance(_obj, Arc):
            _cp = _obj.getCenter()
            _pid = id(_cp)
            if _pid in _objdict:
                _objdict[_pid] = False
            for _ep in _obj.getEndpoints():
                _lp = layer.find('point', _ep[0], _ep[1])
                assert _lp is not None, "Missing arc endpoint:" + str(_ep)
                _pid = id(_lp)
                if _pid in _objdict:
                    _objdict[_pid] = False
        elif isinstance(_obj, (Circle, CCircle)):
            _cp = _obj.getCenter()
            _pid = id(_cp)
            if _pid in _objdict:
                _objdict[_pid] = False
        elif isinstance(_obj, (HCLine, VCLine, ACLine)):
            _lp = _obj.getLocation()
            _pid = id(_lp)
            if _pid in _objdict:
                _objdict[_pid] = False
        elif isinstance(_obj, CLine):
            _p1, _p2 = _obj.getKeypoints()
            _pid = id(_p1)
            if _pid in _objdict:
                _objdict[_pid] = False
            _pid = id(_p2)
            if _pid in _objdict:
                _objdict[_pid] = False
        elif isinstance(_obj, (Chamfer, Fillet)):
            continue # chamfers/fillets do not delete attached segments
        elif isinstance(_obj, (Leader, Polyline)):
            for _pt in _obj.getPoints():
                _pid = id(_pt)
                if _pid in _objdict:
                    _objdict[_pid] = False
        elif isinstance(_obj, TextBlock):
            continue
        else:
            pass
    for _obj in objlist:
        if _objdict[id(_obj)]:
            layer.delObject(_obj)