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# <pep8 compliant>

import bpy
from rigify import RigifyError
from rigify_utils import bone_class_instance, copy_bone_simple
from rna_prop_ui import rna_idprop_ui_prop_get

# not used, defined for completeness
METARIG_NAMES = ("pelvis", "ribcage")


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('pelvis')
    bone.head[:] = 0.0000, -0.0306, 0.1039
    bone.tail[:] = 0.0000, -0.0306, -0.0159
    bone.roll = 0.0000
    bone.use_connect = False
    bone = arm.edit_bones.new('rib_cage')
    bone.head[:] = 0.0000, -0.0306, 0.1039
    bone.tail[:] = 0.0000, -0.0306, 0.2236
    bone.roll = -0.0000
    bone.use_connect = False
    bone.parent = arm.edit_bones['pelvis']
    bone = arm.edit_bones.new('spine.01')
    bone.head[:] = 0.0000, 0.0000, -0.0000
    bone.tail[:] = 0.0000, -0.0306, 0.1039
    bone.roll = -0.0000
    bone.use_connect = False
    bone.parent = arm.edit_bones['rib_cage']
    bone = arm.edit_bones.new('spine.02')
    bone.head[:] = 0.0000, -0.0306, 0.1039
    bone.tail[:] = -0.0000, -0.0398, 0.2045
    bone.roll = -0.0000
    bone.use_connect = True
    bone.parent = arm.edit_bones['spine.01']
    bone = arm.edit_bones.new('spine.03')
    bone.head[:] = -0.0000, -0.0398, 0.2045
    bone.tail[:] = -0.0000, -0.0094, 0.2893
    bone.roll = -0.0000
    bone.use_connect = True
    bone.parent = arm.edit_bones['spine.02']
    bone = arm.edit_bones.new('spine.04')
    bone.head[:] = -0.0000, -0.0094, 0.2893
    bone.tail[:] = -0.0000, 0.0335, 0.3595
    bone.roll = -0.0000
    bone.use_connect = True
    bone.parent = arm.edit_bones['spine.03']
    bone = arm.edit_bones.new('spine.05')
    bone.head[:] = -0.0000, 0.0335, 0.3595
    bone.tail[:] = -0.0000, 0.0555, 0.4327
    bone.roll = -0.0000
    bone.use_connect = True
    bone.parent = arm.edit_bones['spine.04']
    bone = arm.edit_bones.new('spine.06')
    bone.head[:] = -0.0000, 0.0555, 0.4327
    bone.tail[:] = -0.0000, 0.0440, 0.5207
    bone.roll = -0.0000
    bone.use_connect = True
    bone.parent = arm.edit_bones['spine.05']
    bone = arm.edit_bones.new('spine.07')
    bone.head[:] = -0.0000, 0.0440, 0.5207
    bone.tail[:] = -0.0000, 0.0021, 0.5992
    bone.roll = -0.0000
    bone.use_connect = True
    bone.parent = arm.edit_bones['spine.06']

    bpy.ops.object.mode_set(mode='OBJECT')
    pbone = obj.pose.bones['rib_cage']
    pbone['type'] = 'spine_pivot_flex'


def metarig_definition(obj, orig_bone_name):
    '''
    The bone given is the second in a chain.
    Expects at least 1 parent and a chain of children withe the same basename
    eg.
        pelvis -> rib_cage -> spine.01 -> spine.02 -> spine.03

    note: same as neck.
    '''
    arm = obj.data
    ribcage = arm.bones[orig_bone_name]
    pelvis = ribcage.parent

    if pelvis is None:
        raise RigifyError("expected the ribcage bone:'%s' to have a parent (ribcage)." % ribcage.name)

    children = ribcage.children
    if len(children) != 1:
        raise RigifyError("expected the ribcage to have only 1 child.")

    child = children[0]

    bone_definition = [pelvis.name, ribcage.name, child.name]
    bone_definition.extend([child.name for child in child.children_recursive_basename])
    return bone_definition


def fk(*args):
    main(*args)


def deform(obj, definitions, base_names, options):
    for org_bone_name in definitions[2:]:
        bpy.ops.object.mode_set(mode='EDIT')

        # Create deform bone.
        bone = copy_bone_simple(obj.data, org_bone_name, "DEF-%s" % base_names[org_bone_name], parent=True)

        # Store name before leaving edit mode
        bone_name = bone.name

        # Leave edit mode
        bpy.ops.object.mode_set(mode='OBJECT')

        # Get the pose bone
        bone = obj.pose.bones[bone_name]

        # Constrain to the original bone
        # XXX. Todo, is this needed if the bone is connected to its parent?
        con = bone.constraints.new('COPY_TRANSFORMS')
        con.name = "copy_loc"
        con.target = obj
        con.subtarget = org_bone_name


def main(obj, bone_definition, base_names, options):
    from mathutils import Vector, Matrix
    from math import radians, pi

    arm = obj.data

    # Initialize container classes for convenience
    mt = bone_class_instance(obj, ["pelvis", "ribcage"]) # meta
    mt.pelvis = bone_definition[0]
    mt.ribcage = bone_definition[1]
    mt.update()

    spine_chain_orig = tuple(bone_definition[2:])
    spine_chain = [arm.edit_bones[child_name] for child_name in spine_chain_orig]
    spine_chain_basename = base_names[spine_chain[0].name].rsplit(".", 1)[0] # probably 'ORG-spine.01' -> 'spine'
    spine_chain_len = len(spine_chain_orig)

    child = spine_chain[0]
    spine_chain_segment_length = child.length
    #child.parent = mt.pelvis_e # was mt.ribcage

    # The first bone in the chain happens to be the basis of others, create them now
    ex = bone_class_instance(obj, ["pelvis_copy", "ribcage_hinge", "ribcage_copy", "spine_rotate"])

    ex.pelvis_copy_e = copy_bone_simple(arm, mt.pelvis, base_names[mt.pelvis]) # no parent
    ex.pelvis_copy = ex.pelvis_copy_e.name
    ex.pelvis_copy_e.use_local_location = False

    # copy the pelvis, offset to make MCH-spine_rotate and MCH-ribcage_hinge
    ex.ribcage_hinge_e = copy_bone_simple(arm, mt.pelvis, "MCH-%s_hinge" % base_names[mt.ribcage])
    ex.ribcage_hinge = ex.ribcage_hinge_e.name
    ex.ribcage_hinge_e.translate(Vector((0.0, spine_chain_segment_length / 4.0, 0.0)))

    ex.spine_rotate_e = copy_bone_simple(arm, mt.ribcage, "MCH-%s_rotate" % spine_chain_basename)
    ex.spine_rotate = ex.spine_rotate_e.name
    ex.spine_rotate_e.translate(Vector((0.0, spine_chain_segment_length / 2.0, 0.0)))
    ex.spine_rotate_e.use_connect = False
    ex.spine_rotate_e.parent = ex.pelvis_copy_e


    # Copy the last bone now
    child = spine_chain[-1]

    ex.ribcage_copy_e = copy_bone_simple(arm, mt.ribcage, base_names[mt.ribcage])
    ex.ribcage_copy = ex.ribcage_copy_e.name
    ex.ribcage_copy_e.use_connect = False
    ex.ribcage_copy_e.parent = ex.ribcage_hinge_e

    spine_chain = [child.name for child in spine_chain]

    # We have 3 spine chains
    # - original (ORG_*)
    # - copy (*use original name*)
    # - reverse (MCH-rev_*)
    spine_chain_attrs = [("spine_%.2d" % (i + 1)) for i in range(spine_chain_len)]

    mt_chain = bone_class_instance(obj, spine_chain_attrs) # ORG_*
    rv_chain = bone_class_instance(obj, spine_chain_attrs) # *
    ex_chain = bone_class_instance(obj, spine_chain_attrs) # MCH-rev_*
    del spine_chain_attrs

    for i, child_name in enumerate(spine_chain):
        child_name_orig = base_names[spine_chain_orig[i]]

        attr = mt_chain.attr_names[i] # eg. spine_04

        setattr(mt_chain, attr, spine_chain_orig[i]) # the original bone

        ebone = copy_bone_simple(arm, child_name, child_name_orig) # use the original name
        setattr(ex_chain, attr, ebone.name)

        ebone = copy_bone_simple(arm, child_name, "MCH-rev_%s" % child_name_orig)
        setattr(rv_chain, attr, ebone.name)
        ebone.use_connect = False

    mt_chain.update()
    ex_chain.update()
    rv_chain.update()

    # Now we need to re-parent these chains
    for i, child_name in enumerate(spine_chain_orig):
        attr = ex_chain.attr_names[i] + "_e"
        ebone = getattr(ex_chain, attr)
        if i == 0:
            ebone.use_connect = False
            ebone.parent = ex.pelvis_copy_e
        else:
            attr_parent = ex_chain.attr_names[i - 1] + "_e"
            ebone.parent = getattr(ex_chain, attr_parent)

        # intentional! get the parent from the other parallel chain member
        getattr(rv_chain, attr).parent = ebone


    # ex_chain needs to interlace bones!
    # Note, skip the first bone
    for i in range(1, spine_chain_len): # similar to neck
        child_name_orig = base_names[spine_chain_orig[i]]
        spine_e = getattr(mt_chain, mt_chain.attr_names[i] + "_e")

        # dont store parent names, re-reference as each chain bones parent.
        spine_e_parent = arm.edit_bones.new("MCH-rot_%s" % child_name_orig)
        spine_e_parent.head = spine_e.head
        spine_e_parent.tail = spine_e.head + (mt.ribcage_e.vector.normalize() * spine_chain_segment_length / 2.0)
        spine_e_parent.roll = mt.ribcage_e.roll


        spine_e = getattr(ex_chain, ex_chain.attr_names[i] + "_e")
        orig_parent = spine_e.parent
        spine_e.use_connect = False
        spine_e.parent = spine_e_parent
        spine_e_parent.use_connect = False

        spine_e_parent.parent = orig_parent


    # Rotate the rev chain 180 about the by the first bones center point
    pivot = (rv_chain.spine_01_e.head + rv_chain.spine_01_e.tail) * 0.5
    matrix = Matrix.Rotation(radians(180), 3, 'X')
    for i, attr in enumerate(rv_chain.attr_names): # similar to neck
        spine_e = getattr(rv_chain, attr + "_e")
        # use the first bone as the pivot

        spine_e.head = ((spine_e.head - pivot) * matrix) + pivot
        spine_e.tail = ((spine_e.tail - pivot) * matrix) + pivot
        spine_e.roll += pi # 180d roll
        del spine_e

    deform(obj, bone_definition, base_names, options)

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

    # refresh pose bones
    mt.update()
    ex.update()
    mt_chain.update()
    ex_chain.update()
    rv_chain.update()

    # Axis locks
    ex.ribcage_copy_p.lock_location = True, True, True

    con = ex.ribcage_hinge_p.constraints.new('COPY_ROTATION')
    con.name = "hinge"
    con.target = obj
    con.subtarget = ex.pelvis_copy

    # add driver
    fcurve = con.driver_add("influence")
    driver = fcurve.driver
    var = driver.variables.new()
    driver.type = 'AVERAGE'
    var.name = "var"
    var.targets[0].id_type = 'OBJECT'
    var.targets[0].id = obj
    var.targets[0].data_path = ex.ribcage_copy_p.path_from_id() + '["hinge"]'

    mod = fcurve.modifiers[0]
    mod.poly_order = 1
    mod.coefficients[0] = 1.0
    mod.coefficients[1] = -1.0

    con = ex.spine_rotate_p.constraints.new('COPY_ROTATION')
    con.target = obj
    con.subtarget = ex.ribcage_copy

    # ex.pelvis_copy_p / rib_cage
    con = ex.ribcage_copy_p.constraints.new('COPY_LOCATION')
    con.target = obj
    con.subtarget = ex.pelvis_copy
    con.head_tail = 0.0

    # This stores all important ID props
    prop = rna_idprop_ui_prop_get(ex.ribcage_copy_p, "hinge", create=True)
    ex.ribcage_copy_p["hinge"] = 1.0
    prop["soft_min"] = 0.0
    prop["soft_max"] = 1.0

    prop = rna_idprop_ui_prop_get(ex.ribcage_copy_p, "pivot_slide", create=True)
    ex.ribcage_copy_p["pivot_slide"] = 1.0 / spine_chain_len
    prop["soft_min"] = 1.0 / spine_chain_len
    prop["soft_max"] = 1.0


    # Create a fake connected parent/child relationship with bone location constraints
    # positioned at the tip.

    # reverse bones / MCH-rev_spine.##
    for i in range(1, spine_chain_len):
        spine_p = getattr(rv_chain, rv_chain.attr_names[i] + "_p")
        spine_fake_parent_name = getattr(rv_chain, rv_chain.attr_names[i - 1])

        con = spine_p.constraints.new('COPY_LOCATION')
        con.target = obj
        con.subtarget = spine_fake_parent_name
        con.head_tail = 1.0
        del spine_p, spine_fake_parent_name, con


    # Constrain 'inbetween' bones
    target_names = [("b%.2d" % (i + 1)) for i in range(spine_chain_len - 1)]
    rib_driver_path = ex.ribcage_copy_p.path_from_id()

    ex.ribcage_copy_p["bend_tot"] = 0.0
    fcurve = ex.ribcage_copy_p.driver_add('["bend_tot"]')
    driver = fcurve.driver
    driver.type = 'SUM'
    fcurve.modifiers.remove(fcurve.modifiers[0]) # grr dont need a modifier

    for i in range(spine_chain_len - 1):
        var = driver.variables.new()
        var.name = target_names[i]
        var.targets[0].id_type = 'OBJECT'
        var.targets[0].id = obj
        var.targets[0].data_path = rib_driver_path + ('["bend_%.2d"]' % (i + 1))

    for i in range(1, spine_chain_len):

        # Add bend prop
        prop_name = "bend_%.2d" % i
        prop = rna_idprop_ui_prop_get(ex.ribcage_copy_p, prop_name, create=True)
        if ("bend_%.2d" % i) in options:
            ex.ribcage_copy_p[prop_name] = options["bend_%.2d" % i]
        else:
            ex.ribcage_copy_p[prop_name] = 1.0
        prop["soft_min"] = 0.0
        prop["soft_max"] = 1.0

        spine_p = getattr(ex_chain, ex_chain.attr_names[i] + "_p")
        spine_p_parent = spine_p.parent # interlaced bone

        con = spine_p_parent.constraints.new('COPY_ROTATION')
        con.target = obj
        con.subtarget = ex.spine_rotate
        con.owner_space = 'LOCAL'
        con.target_space = 'LOCAL'
        del spine_p

        # add driver
        fcurve = con.driver_add("influence")
        driver = fcurve.driver
        driver.type = 'SCRIPTED'
        driver.expression = "bend/bend_tot"

        fcurve.modifiers.remove(fcurve.modifiers[0]) # grr dont need a modifier


        # add target
        var = driver.variables.new()
        var.name = "bend_tot"
        var.targets[0].id_type = 'OBJECT'
        var.targets[0].id = obj
        var.targets[0].data_path = rib_driver_path + ('["bend_tot"]')

        var = driver.variables.new()
        var.name = "bend"
        var.targets[0].id_type = 'OBJECT'
        var.targets[0].id = obj
        var.targets[0].data_path = rib_driver_path + ('["%s"]' % prop_name)



    # original bone drivers
    # note: the first bone has a lot more constraints, but also this simple one is first.
    for i, attr in enumerate(mt_chain.attr_names):
        spine_p = getattr(mt_chain, attr + "_p")

        con = spine_p.constraints.new('COPY_ROTATION')
        con.target = obj
        con.subtarget = getattr(ex_chain, attr) # lock to the copy's rotation
        del spine_p

    # pivot slide: - lots of copy location constraints.

    con = mt_chain.spine_01_p.constraints.new('COPY_LOCATION')
    con.name = "base"
    con.target = obj
    con.subtarget = rv_chain.spine_01 # lock to the reverse location

    for i in range(1, spine_chain_len + 1):
        con = mt_chain.spine_01_p.constraints.new('COPY_LOCATION')
        con.name = "slide_%d" % i
        con.target = obj

        if i == spine_chain_len:
            attr = mt_chain.attr_names[i - 1]
        else:
            attr = mt_chain.attr_names[i]

        con.subtarget = getattr(rv_chain, attr) # lock to the reverse location

        if i == spine_chain_len:
            con.head_tail = 1.0

        fcurve = con.driver_add("influence")
        driver = fcurve.driver
        var = driver.variables.new()
        driver.type = 'AVERAGE'
        var.name = "var"
        var.targets[0].id_type = 'OBJECT'
        var.targets[0].id = obj
        var.targets[0].data_path = rib_driver_path + '["pivot_slide"]'

        mod = fcurve.modifiers[0]
        mod.poly_order = 1
        mod.coefficients[0] = - (i - 1)
        mod.coefficients[1] = spine_chain_len


    # Set pelvis and ribcage controls to use the first and last bone in the
    # spine respectively for their custom shape transform
    ex.ribcage_copy_p.custom_shape_transform = obj.pose.bones[bone_definition[len(bone_definition)-1]]
    ex.pelvis_copy_p.custom_shape_transform = obj.pose.bones[bone_definition[2]]


    # last step setup layers
    if "ex_layer" in options:
        layer = [n == options["ex_layer"] for n in range(0, 32)]
    else:
        layer = list(arm.bones[bone_definition[1]].layers)
    for attr in ex.attr_names:
        getattr(ex, attr + "_b").layers = layer
    for attr in ex_chain.attr_names:
        getattr(ex_chain, attr + "_b").layers = layer
    for attr in rv_chain.attr_names:
        getattr(rv_chain, attr + "_b").layers = layer

    layer = list(arm.bones[bone_definition[1]].layers)
    arm.bones[ex.pelvis_copy].layers = layer
    arm.bones[ex.ribcage_copy].layers = layer

    # no support for blending chains
    return None
