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

import bpy


def library_report():
    libraries = list(bpy.data.libraries)
    if len(libraries) != 1:
        raise RuntimeError(f"expected one library, found {len(libraries)}")
    library = libraries[0]
    return {
        "id": "library:" + library.name,
        "name": library.name,
        "sourcePath": library.filepath,
        "packed": library.packed_file is not None,
        "readOnly": True,
        "dependencyIds": [],
    }


def main() -> None:
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --python check-library-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 = library_report()
    descriptor, temporary = tempfile.mkstemp(prefix="m16-library-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 = library_report()
    finally:
        pathlib.Path(temporary).unlink(missing_ok=True)
    if before != after:
        raise RuntimeError(f"library save/reopen drift: {before} != {after}")
    report = {
        "schemaVersion": 1,
        "task": "M16-GAP-00011",
        "operation": "LIBRARY_DATABLOCK_DESKTOP",
        "fixture": str(fixture),
        "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
        "library": after,
        "saveReopen": "EXACT",
        "blenderVersion": bpy.app.version_string,
    }
    output.parent.mkdir(parents=True, exist_ok=True)
    output.write_text(json.dumps(report, indent=2, sort_keys=True) + "\n", encoding="utf-8")
    print(f"library-desktop-ok id={after['id']} sourcePath={after['sourcePath']} saveReopen=exact")


if __name__ == "__main__":
    main()