# generat3D - evaluate Daz DSON scenes and write .dbz files
# Copyright (C) 2026 Danilo M. <danix@danix.xyz>
#
# This program 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.
#
# This program 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 this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

from .scene import AXES, REST_CHANNELS, key


def evaluate(scene):
    """Morphed rest vertices and per-node rest channels {node id: {channel: [x, y, z]}}."""
    values = scene.graph.evaluate()
    fig = scene.figure
    verts = fig.verts.copy()
    for k, (idx, deltas) in fig.morphs.items():
        w = values.get(k, 0.0)
        if w:
            verts[idx] += w * deltas  # indices are unique within one morph
    rest = {n.id: {ch: [values[key(n.id, n.id, f"{ch}/{a}")] for a in AXES]
                   for ch in REST_CHANNELS}
            for n in fig.nodes}
    return verts, rest