#!/usr/bin/env python3
"""Read the Action gap fixture with Blender 5.2 and verify save/reopen stability."""
import hashlib
import json
import pathlib
import sys
import tempfile
import os

import bpy


def action_report():
    actions = []
    for action in sorted(bpy.data.actions, key=lambda value: value.name):
        channels = []
        for layer in action.layers:
            for strip in layer.strips:
                for bag in strip.channelbags:
                    channels.extend((curve.data_path, curve.array_index, len(curve.keyframe_points)) for curve in bag.fcurves)
        actions.append({"name": action.name, "frameRange": [round(float(value), 6) for value in action.frame_range], "channels": sorted(channels)})
    return actions


def main():
    args = sys.argv[sys.argv.index("--") + 1:]
    if len(args) != 2:
        raise SystemExit("usage: blender -b --python check-action-desktop.py -- FIXTURE REPORT")
    fixture, report_path = (pathlib.Path(value).resolve() for value in args)
    bpy.ops.wm.open_mainfile(filepath=str(fixture), load_ui=False)
    before = action_report()
    if len(before) != 1 or before[0]["name"] != "AnimatedObjectAction":
        raise RuntimeError(f"unexpected Action inventory: {before}")
    descriptor, temporary = tempfile.mkstemp(prefix="m16-action-reopen-", suffix=".blend")
    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 = action_report()
    finally:
        pathlib.Path(temporary).unlink(missing_ok=True)
    if before != after:
        raise RuntimeError(f"Action save/reopen drift: before={before} after={after}")
    report = {"schemaVersion": 1, "task": "M16-GAP-00001", "operation": "ACTION_DATABLOCK_DESKTOP", "fixture": str(fixture), "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(), "actions": after, "saveReopen": "EXACT", "blenderVersion": bpy.app.version_string}
    report_path.parent.mkdir(parents=True, exist_ok=True)
    report_path.write_text(json.dumps(report, indent=2, sort_keys=True) + "\n", encoding="utf-8")
    print(f"action-desktop-ok actions={len(after)} channels={len(after[0]['channels'])} saveReopen=exact")


if __name__ == "__main__":
    main()