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

import bpy


def report():
    mesh_object = bpy.data.objects.get("WebGapArmatureMeshObject")
    armature_object = bpy.data.objects.get("WebGapArmatureObject")
    if mesh_object is None or mesh_object.type != "MESH":
        raise RuntimeError("WebGapArmatureMeshObject is missing")
    if armature_object is None or armature_object.type != "ARMATURE":
        raise RuntimeError("WebGapArmatureObject is missing")
    modifiers = [modifier for modifier in mesh_object.modifiers if modifier.type == "ARMATURE"]
    if len(modifiers) != 1:
        raise RuntimeError(f"expected exactly one ARMATURE modifier, found {len(modifiers)}")
    modifier = modifiers[0]
    type_code = bpy.types.Modifier.bl_rna.properties["type"].enum_items[modifier.type].value
    return {
        "meshId": "mesh:" + mesh_object.data.name,
        "meshName": mesh_object.data.name,
        "armatureObjectId": "object:" + armature_object.name,
        "armatureDataId": "armature:" + armature_object.data.name,
        "modifier": {
            "name": modifier.name,
            "type": modifier.type,
            "typeCode": type_code,
            "enabled": bool(modifier.show_viewport),
            "showViewport": bool(modifier.show_viewport),
            "showRender": bool(modifier.show_render),
            "showEditMode": bool(modifier.show_in_editmode),
            "showOnCage": bool(modifier.show_on_cage),
            "vertexGroup": modifier.vertex_group,
            "targetObjectId": "object:" + modifier.object.name if modifier.object else None,
        },
    }


def main():
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --python check-armature-modifier-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="m16-armature-modifier-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"armature modifier save/reopen drift: {before} != {after}")
    value = {
        "schemaVersion": 1,
        "task": "M16-GAP-00030",
        "operation": "ARMATURE_MODIFIER_DESKTOP",
        "fixture": str(fixture),
        "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
        "modifier": 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(f"armature-modifier-desktop-ok mesh={after['meshId']} modifier={after['modifier']['name']} saveReopen=exact")


if __name__ == "__main__":
    main()