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

import bpy


def nla_report():
    obj = bpy.data.objects.get("WebGapPushDownObject")
    if obj is None or obj.animation_data is None:
        raise RuntimeError("WebGapPushDownObject animation data is missing")
    tracks = []
    for track in obj.animation_data.nla_tracks:
        tracks.append({"name": track.name, "strips": [{"name": strip.name, "action": strip.action.name if strip.action else None, "frameStart": round(float(strip.frame_start), 6), "frameEnd": round(float(strip.frame_end), 6)} for strip in track.strips]})
    return {"activeAction": obj.animation_data.action.name if obj.animation_data.action else None, "tracks": tracks}


def main():
    arguments = sys.argv[sys.argv.index("--") + 1:]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --python check-action-push-down-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 = nla_report()
    if before["activeAction"] is not None or len(before["tracks"]) != 1 or len(before["tracks"][0]["strips"]) != 1:
        raise RuntimeError(f"unexpected action.push_down result: {before}")
    descriptor, temporary = tempfile.mkstemp(prefix="m16-action-push-down-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 = nla_report()
    finally: pathlib.Path(temporary).unlink(missing_ok=True)
    if before != after: raise RuntimeError(f"action.push_down save/reopen drift: {before} != {after}")
    report = {"schemaVersion": 1, "task": "M16-GAP-00132", "operation": "ACTION_PUSH_DOWN_DESKTOP", "fixture": str(fixture), "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(), "nla": 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("action-push-down-desktop-ok tracks=1 strips=1 activeAction=none saveReopen=exact")


if __name__ == "__main__": main()