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

import bpy


def view_report():
    area = next((candidate for screen in bpy.data.screens for candidate in screen.areas if candidate.type == "DOPESHEET_EDITOR" and candidate.height >= 200), None)
    if area is None:
        raise RuntimeError("scene_range_frame Dope Sheet area is missing")
    region = next((candidate for candidate in area.regions if candidate.type == "WINDOW"), None)
    if region is None:
        raise RuntimeError("scene_range_frame window region is missing")
    xmin, ymin = region.view2d.region_to_view(0, 0)
    xmax, ymax = region.view2d.region_to_view(region.width - 1, region.height - 1)
    return {
        "areaType": area.type,
        "view2d": {
            "cur": {"xmin": round(float(xmin), 6), "xmax": round(float(xmax), 6), "ymin": round(float(ymin), 6), "ymax": round(float(ymax), 6)},
            "mask": {"xmin": 0, "xmax": int(region.width - 1), "ymin": 0, "ymax": int(region.height - 1)},
        },
    }


def frame_scene_range():
    window = bpy.context.window
    screen = window.screen
    area = next(candidate for candidate in screen.areas if candidate.type == "DOPESHEET_EDITOR" and candidate.height >= 200)
    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):
        poll = bool(bpy.ops.anim.scene_range_frame.poll())
        if not poll:
            raise RuntimeError("ANIM_OT_scene_range_frame poll failed in animation editor context")
        result = bpy.ops.anim.scene_range_frame()
    if "FINISHED" not in result:
        raise RuntimeError(f"ANIM_OT_scene_range_frame returned {result}")
    return poll, result


def main():
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --factory-startup --python check-action-scene-range-frame-desktop.py -- FIXTURE REPORT")
    fixture, output = (pathlib.Path(value).resolve() for value in arguments)
    bpy.ops.wm.open_mainfile(filepath=str(fixture), load_ui=True)
    before = view_report()
    poll, result = frame_scene_range()
    after = view_report()
    if before != after:
        raise RuntimeError(f"scene_range_frame view drifted on repeat: {before} != {after}")
    descriptor, temporary = tempfile.mkstemp(prefix="m16-anim-scene-range-frame-reopen-", suffix=".blend")
    os.close(descriptor)
    temporary_path = pathlib.Path(temporary)
    try:
        bpy.ops.wm.save_as_mainfile(filepath=str(temporary_path), check_existing=False, compress=True)
        bpy.ops.wm.open_mainfile(filepath=str(temporary_path), load_ui=True)
        reopened = view_report()
        if reopened != after:
            raise RuntimeError(f"anim.scene_range_frame save/reopen drift: {after} != {reopened}")
        report = {
            "schemaVersion": 1,
            "task": "M16-GAP-00204",
            "operation": "ANIM_SCENE_RANGE_FRAME_DESKTOP",
            "fixture": str(fixture),
            "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
            "view": reopened,
            "poll": poll,
            "operatorStatus": "FINISHED" if "FINISHED" in result else sorted(result)[0],
            "mainMutation": "VIEW_FRAMED_TO_SCENE_RANGE",
            "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("anim-scene-range-frame-desktop-ok poll=true status=FINISHED mainMutation=view_framed saveReopen=exact")
    finally:
        temporary_path.unlink(missing_ok=True)


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