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

import bpy


def main():
    arguments = sys.argv[sys.argv.index("--") + 1:]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --python check-action-previewrange-set-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)
    scene = bpy.context.scene
    if not scene.use_preview_range or (scene.frame_preview_start, scene.frame_preview_end) != (1, 5):
        raise RuntimeError(f"unexpected action.previewrange_set result: use={scene.use_preview_range} range={(scene.frame_preview_start, scene.frame_preview_end)}")
    before = {"start": int(scene.frame_preview_start), "end": int(scene.frame_preview_end), "use": bool(scene.use_preview_range)}
    descriptor, temporary = tempfile.mkstemp(prefix="m16-action-previewrange-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 = {"start": int(bpy.context.scene.frame_preview_start), "end": int(bpy.context.scene.frame_preview_end), "use": bool(bpy.context.scene.use_preview_range)}
    finally: pathlib.Path(temporary).unlink(missing_ok=True)
    if before != after: raise RuntimeError(f"action.previewrange_set save/reopen drift: {before} != {after}")
    report = {"schemaVersion": 1, "task": "M16-GAP-00131", "operation": "ACTION_PREVIEWRANGE_SET_DESKTOP", "fixture": str(fixture), "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(), "previewRange": {"start": after["start"], "end": after["end"]}, "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-previewrange-set-desktop-ok range=1-5 saveReopen=exact")


if __name__ == "__main__": main()