#!/usr/bin/env python3
import hashlib
import json
import os
import pathlib
import sys
import tempfile

import bpy


def rounded(value):
    return round(float(value), 6)


def matrix(value):
    return [rounded(component) for row in value for component in row]


def report():
    mesh_object = bpy.data.objects.get("WBV2P3003SkinnedMeshObject")
    armature_object = bpy.data.objects.get("WBV2P3003ArmatureObject")
    if mesh_object is None or armature_object is None:
        raise RuntimeError("RIG_INVALID: required objects are missing")
    armature = armature_object.data
    bones = []
    for bone in armature.bones:
        pose_bone = armature_object.pose.bones[bone.name]
        bones.append({
            "name": bone.name,
            "parent": bone.parent.name if bone.parent else None,
            "head": [rounded(value) for value in bone.head_local],
            "tail": [rounded(value) for value in bone.tail_local],
            "poseMatrix": matrix(pose_bone.matrix),
            "constraints": [{
                "name": constraint.name,
                "type": constraint.type,
                "influence": rounded(constraint.influence),
            } for constraint in pose_bone.constraints],
        })
    groups = [group.name for group in mesh_object.vertex_groups]
    weights = []
    for vertex in mesh_object.data.vertices:
        weights.append({
            group.name: rounded(next((item.weight for item in vertex.groups if item.group == group.index), 0.0))
            for group in mesh_object.vertex_groups
        })
    shape_keys = []
    if mesh_object.data.shape_keys:
        for key in mesh_object.data.shape_keys.key_blocks:
            shape_keys.append({
                "name": key.name,
                "value": rounded(key.value),
                "positions": [rounded(component) for point in key.data for component in point.co],
            })
    modifier = next((value for value in mesh_object.modifiers if value.type == "ARMATURE"), None)
    if modifier is None or modifier.object != armature_object:
        raise RuntimeError("RIG_INVALID: armature modifier is missing")
    object_constraints = [{
        "name": constraint.name,
        "type": constraint.type,
        "influence": rounded(constraint.influence),
    } for constraint in mesh_object.constraints]
    return {
        "armature": {
            "id": "armature:" + armature.name,
            "objectId": "object:" + armature_object.name,
            "name": armature.name,
            "bones": bones,
        },
        "mesh": {
            "id": "mesh:" + mesh_object.data.name,
            "objectId": "object:" + mesh_object.name,
            "groups": groups,
            "weights": weights,
            "shapeKeys": shape_keys,
            "armatureModifier": {"name": modifier.name, "objectId": "object:" + armature_object.name},
            "constraints": object_constraints,
        },
        "unsupportedConstraint": {
            "name": "WBV2P3003UnsupportedLimitRotation",
            "type": "LIMIT_ROTATION",
            "status": "EXPLICIT_UNSUPPORTED_BY_WASM_DEPSGRAPH",
        },
    }


def main():
    arguments = sys.argv[sys.argv.index("--") + 1:]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --factory-startup --python check-wbv2-p3-003-desktop.py -- FIXTURE REPORT")
    fixture, output = (pathlib.Path(value).resolve() for value in arguments)
    bpy.ops.wm.open_mainfile(filepath=str(fixture), load_ui=False)
    before = report()
    descriptor, temporary = tempfile.mkstemp(prefix="wbv2-p3-003-reopen-", suffix=".blend", dir=fixture.parent)
    os.close(descriptor)
    try:
        bpy.ops.wm.save_as_mainfile(filepath=temporary, check_existing=False, compress=True)
        bpy.ops.wm.open_mainfile(filepath=temporary, load_ui=False)
        after = report()
    finally:
        pathlib.Path(temporary).unlink(missing_ok=True)
    if before != after:
        raise RuntimeError(f"RIG_INVALID: desktop save/reopen drift: {before} != {after}")
    value = {
        "schemaVersion": 1,
        "task": "WBV2-P3-003",
        "operation": "RIG_POSE_SKIN_DESKTOP",
        "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
        "rig": after,
        "saveReopen": "EXACT",
        "blenderVersion": bpy.app.version_string,
    }
    output.parent.mkdir(parents=True, exist_ok=True)
    output.write_text(json.dumps(value, indent=2, sort_keys=True) + "\n", encoding="utf-8")
    print("wbv2-p3-003-desktop-ok armature=%s bones=%d groups=%d shapeKeys=%d unsupported=explicit saveReopen=exact" % (after["armature"]["id"], len(after["armature"]["bones"]), len(after["mesh"]["groups"]), len(after["mesh"]["shapeKeys"])))


if __name__ == "__main__":
    main()