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

import bpy


IMAGE_NAME = "WebGapAssetDownloadImage"


def image_state():
    image = bpy.data.images.get(IMAGE_NAME)
    if image is None:
        raise RuntimeError("asset download fixture image is missing")
    return {
        "name": image.name,
        "filepath": image.filepath,
        "source": image.source,
        "packed": image.packed_file is not None,
        "size": [int(image.generated_width), int(image.generated_height)],
    }


def main():
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --python check-action-asset-download-desktop.py -- FIXTURE REPORT")
    fixture, output = (pathlib.Path(value).resolve() for value in arguments)
    output.unlink(missing_ok=True)
    bpy.ops.wm.open_mainfile(filepath=str(fixture), load_ui=False)
    bpy.context.preferences.system.use_online_access = True
    before = image_state()
    poll = bool(bpy.ops.asset.asset_download.poll())
    try:
        bpy.ops.asset.asset_download(relative_asset_identifier="WebGapAssetDownload")
    except RuntimeError as error:
        if "Asset could not be found" not in str(error):
            raise
        operator_status = "CANCELLED"
    else:
        raise RuntimeError("asset.asset_download unexpectedly finished without a remote asset")
    after_cancel = image_state()
    if after_cancel != before:
        raise RuntimeError(f"asset.asset_download cancellation changed Main data: {before} != {after_cancel}")

    with tempfile.NamedTemporaryFile(prefix="m16-asset-download-reopen-", suffix=".blend", dir=fixture.parent) as temporary:
        bpy.ops.wm.save_as_mainfile(filepath=temporary.name, check_existing=False, compress=True)
        bpy.ops.wm.open_mainfile(filepath=temporary.name, load_ui=False)
        after = image_state()
    if after != before:
        raise RuntimeError(f"asset.asset_download save/reopen drift: {before} != {after}")
    report = {
        "schemaVersion": 1,
        "task": "M16-GAP-00264",
        "operation": "ASSET_ASSET_DOWNLOAD_DESKTOP",
        "fixture": str(fixture),
        "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
        "before": before,
        "after": after,
        "poll": poll,
        "operatorStatus": operator_status,
        "mainMutation": "NONE",
        "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("asset-asset-download-desktop-ok status=CANCELLED mainMutation=none saveReopen=exact")


if __name__ == "__main__":
    try:
        main()
    except Exception as error:
        print(f"asset-asset-download-desktop-failed: {error}")
        raise SystemExit(1)