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

import bpy


TEXT_NAME = "WBV2-P1-002-SceneIRContract"
CONTRACT_ID = "workflow:unify_sceneir_stable_ids_and_binary_deltas"


def contract():
    return {
        "schemaVersion": 1,
        "contractId": CONTRACT_ID,
        "stableIds": {
            "objectId": "object:WBV2P1002CubeObject",
            "meshId": "mesh:WBV2P1002CubeMesh",
        },
        "binaryDelta": {
            "schemaVersion": 1,
            "baseRevision": 1,
            "generation": 1,
            "patches": [{"field": "positions", "byteOffset": 0, "byteLength": 12}],
        },
        "extensions": {"futureField": {"kind": "opaque", "value": "preserve-me"}},
    }


def main(output):
    bpy.ops.wm.read_factory_settings(use_empty=True)
    mesh = bpy.data.meshes.new("WBV2P1002CubeMesh")
    mesh.from_pydata(
        [(-1, -1, -1), (1, -1, -1), (1, 1, -1), (-1, 1, -1),
         (-1, -1, 1), (1, -1, 1), (1, 1, 1), (-1, 1, 1)],
        [],
        [(0, 1, 2, 3), (4, 7, 6, 5), (0, 4, 5, 1),
         (1, 5, 6, 2), (2, 6, 7, 3), (4, 0, 3, 7)],
    )
    mesh.update()
    obj = bpy.data.objects.new("WBV2P1002CubeObject", mesh)
    bpy.context.collection.objects.link(obj)
    text = bpy.data.texts.new(TEXT_NAME)
    text.write(json.dumps(contract(), sort_keys=True, separators=(",", ":")))
    text.use_fake_user = True
    bpy.ops.wm.save_as_mainfile(filepath=str(output.resolve()), check_existing=False, compress=True)


if __name__ == "__main__":
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 1:
        raise SystemExit("usage: blender -b --factory-startup --python WBV2-P1-002.py -- OUTPUT")
    main(pathlib.Path(arguments[0]))