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#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
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# ##### END GPL LICENSE BLOCK #####

# <pep8 compliant>

import bpy
from rigify import EMPTY_LAYER
from rigify_utils import copy_bone_simple, get_side_name, get_base_name
from rna_prop_ui import rna_idprop_ui_prop_get
from functools import reduce

METARIG_NAMES = "finger_01", "finger_02", "finger_03"


def metarig_template():
    bpy.ops.object.mode_set(mode='EDIT')
    obj = bpy.context.active_object
    arm = obj.data
    bone = arm.edit_bones.new('finger.01')
    bone.head[:] = 0.0000, 0.0000, 0.0000
    bone.tail[:] = 0.8788, -0.4584, -0.1327
    bone.roll = -2.8722
    bone.connected = False
    bone = arm.edit_bones.new('finger.02')
    bone.head[:] = 0.8788, -0.4584, -0.1327
    bone.tail[:] = 1.7483, -0.9059, -0.3643
    bone.roll = -2.7099
    bone.connected = True
    bone.parent = arm.edit_bones['finger.01']
    bone = arm.edit_bones.new('finger.03')
    bone.head[:] = 1.7483, -0.9059, -0.3643
    bone.tail[:] = 2.2478, -1.1483, -0.7408
    bone.roll = -2.1709
    bone.connected = True
    bone.parent = arm.edit_bones['finger.02']

    bpy.ops.object.mode_set(mode='OBJECT')
    pbone = obj.pose.bones['finger.01']
    pbone['type'] = 'finger_curl'


def metarig_definition(obj, orig_bone_name):
    '''
    The bone given is the first in a chain
    Expects a chain of at least 2 children.
    eg.
        finger -> finger_01 -> finger_02
    '''

    bone_definition = []

    orig_bone = obj.data.bones[orig_bone_name]

    bone_definition.append(orig_bone.name)

    bone = orig_bone
    chain = 0
    while chain < 2: # first 2 bones only have 1 child
        children = bone.children

        if len(children) != 1:
            raise Exception("expected the chain to have 2 children from bone '%s' without a fork" % orig_bone_name)
        bone = children[0]
        bone_definition.append(bone.name) # finger_02, finger_03
        chain += 1

    if len(bone_definition) != len(METARIG_NAMES):
        raise Exception("internal problem, expected %d bones" % len(METARIG_NAMES))

    return bone_definition


def main(obj, bone_definition, base_names):

    # *** EDITMODE

    # get assosiated data
    arm, orig_pbone, orig_ebone = get_bone_data(obj, bone_definition[0])

    obj.animation_data_create() # needed if its a new armature with no keys

    arm.layer[0] = arm.layer[8] = True

    children = orig_pbone.children_recursive
    tot_len = reduce(lambda f, pbone: f + pbone.bone.length, children, orig_pbone.bone.length)

    # FIXME, the line below is far too arbitrary
    base_name = base_names[bone_definition[0]].rsplit(".", 2)[0]

    # first make a new bone at the location of the finger
    #control_ebone = arm.edit_bones.new(base_name)
    control_ebone = copy_bone_simple(arm, bone_definition[0], base_name + get_side_name(base_names[bone_definition[0]]), parent=True)
    control_bone_name = control_ebone.name # we dont know if we get the name requested

    control_ebone.connected = orig_ebone.connected
    control_ebone.parent = orig_ebone.parent
    control_ebone.length = tot_len

    # now add bones inbetween this and its children recursively

    # switching modes so store names only!
    children = [pbone.name for pbone in children]

    # set an alternate layer for driver bones
    other_layer = empty_layer[:]
    other_layer[8] = True


    driver_bone_pairs = []

    for child_bone_name in children:
        child_ebone = arm.edit_bones[child_bone_name]

        # finger.02 --> finger_driver.02
        driver_bone_name = child_bone_name.split('.')
        driver_bone_name = driver_bone_name[0] + "_driver." + ".".join(driver_bone_name[1:])

        driver_ebone = copy_bone_simple(arm, child_ebone.name, driver_bone_name)
        driver_ebone.length *= 0.5
        driver_ebone.layer = other_layer

        # Insert driver_ebone in the chain without connected parents
        driver_ebone.connected = False
        driver_ebone.parent = child_ebone.parent

        child_ebone.connected = False
        child_ebone.parent = driver_ebone

        # Add the drivers to these when in posemode.
        driver_bone_pairs.append((child_bone_name, driver_bone_name))

    del control_ebone


    # *** POSEMODE
    bpy.ops.object.mode_set(mode='OBJECT')


    orig_pbone = obj.pose.bones[bone_definition[0]]
    control_pbone = obj.pose.bones[control_bone_name]


    # only allow Y scale
    control_pbone.lock_scale = (True, False, True)

    control_pbone["bend_ratio"] = 0.4
    prop = rna_idprop_ui_prop_get(control_pbone, "bend_ratio", create=True)
    prop["soft_min"] = 0.0
    prop["soft_max"] = 1.0

    con = orig_pbone.constraints.new('COPY_LOCATION')
    con.target = obj
    con.subtarget = control_bone_name

    con = orig_pbone.constraints.new('COPY_ROTATION')
    con.target = obj
    con.subtarget = control_bone_name



    # setup child drivers on each new smaller bone added. assume 2 for now.

    # drives the bones
    controller_path = control_pbone.path_to_id() # 'pose.bones["%s"]' % control_bone_name

    i = 0
    for child_bone_name, driver_bone_name in driver_bone_pairs:

        # XXX - todo, any number
        if i == 2:
            break

        driver_pbone = obj.pose.bones[driver_bone_name]

        driver_pbone.rotation_mode = 'YZX'
        fcurve_driver = driver_pbone.driver_add("rotation_euler", 0)

        #obj.driver_add('pose.bones["%s"].scale', 1)
        #obj.animation_data.drivers[-1] # XXX, WATCH THIS
        driver = fcurve_driver.driver

        # scale target
        tar = driver.targets.new()
        tar.name = "scale"
        tar.id_type = 'OBJECT'
        tar.id = obj
        tar.rna_path = controller_path + '.scale[1]'

        # bend target
        tar = driver.targets.new()
        tar.name = "br"
        tar.id_type = 'OBJECT'
        tar.id = obj
        tar.rna_path = controller_path + '["bend_ratio"]'

        # XXX - todo, any number
        if i == 0:
            driver.expression = '(-scale+1.0)*pi*2.0*(1.0-br)'
        elif i == 1:
            driver.expression = '(-scale+1.0)*pi*2.0*br'

        child_pbone = obj.pose.bones[child_bone_name]

        # only allow X rotation
        driver_pbone.lock_rotation = child_pbone.lock_rotation = (False, True, True)

        i += 1

    # no blending the result of this
    return None