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

import bpy


def action_report():
    obj = bpy.data.objects.get("WebGapCopyObject")
    if obj is None or obj.animation_data is None or obj.animation_data.action is None:
        raise RuntimeError("WebGapCopyObject Action is missing")
    action = obj.animation_data.action
    channels = []
    for layer in action.layers:
        for strip in layer.strips:
            for bag in strip.channelbags:
                for curve in bag.fcurves:
                    channels.append({
                        "path": curve.data_path,
                        "index": curve.array_index,
                        "frames": [round(float(keyframe.co.x), 6) for keyframe in curve.keyframe_points],
                        "selected": [bool(keyframe.select_control_point) for keyframe in curve.keyframe_points],
                    })
    channels.sort(key=lambda value: (value["path"], value["index"]))
    return {"name": action.name, "channels": channels}


def main():
    arguments = sys.argv[sys.argv.index("--") + 1:]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --python check-action-copy-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 = action_report()
    expected = [[False, True, False]] * 3
    if before["name"] != "WebGapCopyObjectAction" or [channel["selected"] for channel in before["channels"]] != expected:
        raise RuntimeError(f"unexpected action.copy source selection: {before}")
    window = bpy.context.window
    screen = window.screen
    area = next(candidate for candidate in screen.areas if candidate.type == "DOPESHEET_EDITOR")
    region = next(candidate for candidate in area.regions if candidate.type == "WINDOW")
    with bpy.context.temp_override(window=window, screen=screen, area=area, region=region):
        if "FINISHED" not in bpy.ops.action.copy():
            raise RuntimeError("ACTION_OT_copy did not finish")
    after_copy = action_report()
    if after_copy != before:
        raise RuntimeError(f"action.copy changed Main data: {before} != {after_copy}")
    descriptor, temporary = tempfile.mkstemp(prefix="m16-action-copy-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.copy save/reopen drift: {before} != {after}")
    report = {
        "schemaVersion": 1,
        "task": "M16-GAP-00116",
        "operation": "ACTION_COPY_DESKTOP",
        "fixture": str(fixture),
        "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
        "copiedFrames": [3.0],
        "action": after,
        "saveReopen": "EXACT",
        "mainMutation": "NONE",
        "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-copy-desktop-ok channels=3 copiedFrame=3 mainMutation=none saveReopen=exact")


if __name__ == "__main__":
    main()