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# <pep8 compliant>

import bpy
from rigify import RigifyError
from rigify_utils import copy_bone_simple

METARIG_NAMES = tuple()
RIG_TYPE = "stretch"

# TODO
#def metarig_template():
#    # generated by rigify.write_meta_rig
#    bpy.ops.object.mode_set(mode='EDIT')
#    obj = bpy.context.active_object
#    arm = obj.data
#    bone = arm.edit_bones.new('Bone')
#    bone.head[:] = 0.0000, 0.0000, 0.0000
#    bone.tail[:] = 0.0000, 0.0000, 1.0000
#    bone.roll = 0.0000
#    bone.connected = False
#
#    bpy.ops.object.mode_set(mode='OBJECT')
#    pbone = obj.pose.bones['Bone']
#    pbone['type'] = 'copy'

bool_map = {0: False, 1: True,
            0.0: False, 1.0: True,
            "false": False, "true": True,
            "False": False, "True": True,
            "no": False, "yes": True,
            "No": False, "Yes": True}


def metarig_definition(obj, orig_bone_name):
    return (orig_bone_name,)


def main(obj, bone_definition, base_names, options):
    """ A stretchy bone from one bone to another.
        Deformation only (no controls).
    """
    # Verify required parameter
    if "to" not in options:
        raise RigifyError("'%s' rig type requires a 'to' parameter (bone: %s)" % (RIG_TYPE, base_names[bone_definition[0]]))
    if type(options["to"]) is not str:
        raise RigifyError("'%s' rig type 'to' parameter must be a string (bone: %s)" % (RIG_TYPE, base_names[bone_definition[0]]))
    if ("ORG-" + options["to"]) not in obj.data.bones:
        raise RigifyError("'%s' rig type 'to' parameter must name a bone in the metarig (bone: %s)" % (RIG_TYPE, base_names[bone_definition[0]]))

    preserve_volume = None
    # Check optional parameter
    if "preserve_volume" in options:
        try:
            preserve_volume = bool_map[options["preserve_volume"]]
        except KeyError:
            preserve_volume = False

    eb = obj.data.edit_bones
    bb = obj.data.bones
    pb = obj.pose.bones

    bpy.ops.object.mode_set(mode='EDIT')
    arm = obj.data

    mbone1 = bone_definition[0]
    mbone2 = "ORG-" + options["to"]

    bone_e = copy_bone_simple(obj.data, mbone1, "DEF-%s" % base_names[bone_definition[0]])
    bone_e.connected = False
    bone_e.parent = eb[mbone1]
    bone_e.tail = eb[mbone2].head
    bone = bone_e.name


    bpy.ops.object.mode_set(mode='OBJECT')

    # Constraints
    con = pb[bone].constraints.new('DAMPED_TRACK')
    con.target = obj
    con.subtarget = mbone2

    con = pb[bone].constraints.new('STRETCH_TO')
    con.target = obj
    con.subtarget = mbone2
    con.original_length = bb[bone].length
    if preserve_volume:
        con.volume = 'VOLUME_XZX'
    else:
        con.volume = 'NO_VOLUME'

    return tuple()
