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

import bpy


ARMATURE_NAME = "WebGapArmatureCollectionRemoveArmature"
OBJECT_NAME = "WebGapArmatureCollectionRemoveObject"
FIRST_COLLECTION = "WebGapArmatureCollectionRemoveFirst"
REMOVED_COLLECTION = "WebGapArmatureCollectionRemoveRemoved"
LAST_COLLECTION = "WebGapArmatureCollectionRemoveLast"
FIRST_BONE = "WebGapArmatureCollectionRemoveFirstBone"
REMOVED_BONE = "WebGapArmatureCollectionRemoveRemovedBone"
LAST_BONE = "WebGapArmatureCollectionRemoveLastBone"


def state_report():
    armature = bpy.data.armatures.get(ARMATURE_NAME)
    obj = bpy.data.objects.get(OBJECT_NAME)
    if armature is None or obj is None or obj.type != "ARMATURE" or obj.data != armature:
        raise RuntimeError("armature.collection_remove fixture is missing")
    collections = []
    for index, collection in enumerate(armature.collections):
        collections.append({
            "name": collection.name,
            "index": index,
            "bones": sorted(bone.name for bone in collection.bones),
        })
    return {
        "object": OBJECT_NAME,
        "armature": ARMATURE_NAME,
        "activeIndex": armature.collections.active_index,
        "bones": sorted(bone.name for bone in armature.bones),
        "collections": collections,
    }


def run_operator(already_removed):
    obj = bpy.data.objects[OBJECT_NAME]
    bpy.context.view_layer.objects.active = obj
    obj.select_set(True)
    poll = bool(bpy.ops.armature.collection_remove.poll())
    if not poll:
        raise RuntimeError("ARMATURE_OT_collection_remove poll failed")
    if not already_removed:
        result = bpy.ops.armature.collection_remove()
        if result != {"FINISHED"}:
            raise RuntimeError(f"ARMATURE_OT_collection_remove returned {result}")
    return poll, not already_removed


def main():
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --factory-startup --python check-action-armature-collection-remove-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 = state_report()
    before_names = [collection["name"] for collection in before["collections"]]
    if before_names == [FIRST_COLLECTION, LAST_COLLECTION] and before["activeIndex"] == 1:
        already_removed = True
    elif before_names == [FIRST_COLLECTION, REMOVED_COLLECTION, LAST_COLLECTION] and before["activeIndex"] == 1:
        already_removed = False
    else:
        raise RuntimeError(f"unexpected collection_remove input: {before}")
    poll, changed = run_operator(already_removed)
    after = state_report()
    if [collection["name"] for collection in after["collections"]] != [FIRST_COLLECTION, LAST_COLLECTION]:
        raise RuntimeError(f"collection_remove produced unexpected collections: {after}")
    if after["activeIndex"] != 1 or after["bones"] != sorted([FIRST_BONE, REMOVED_BONE, LAST_BONE]):
        raise RuntimeError(f"collection_remove changed active index or armature bones: {after}")
    expected_members = {FIRST_COLLECTION: [FIRST_BONE], LAST_COLLECTION: [LAST_BONE]}
    actual_members = {collection["name"]: collection["bones"] for collection in after["collections"]}
    if actual_members != expected_members:
        raise RuntimeError(f"collection_remove retained removed collection membership: {after}")

    descriptor, temporary = tempfile.mkstemp(prefix="m16-armature-collection-remove-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=False)
        reopened = state_report()
        if reopened != after:
            raise RuntimeError(f"armature.collection_remove save/reopen drift: {after} != {reopened}")
        shutil.copyfile(temporary_path, fixture)
        report = {
            "schemaVersion": 1,
            "task": "M16-GAP-00226",
            "operation": "ARMATURE_COLLECTION_REMOVE_DESKTOP",
            "fixture": str(fixture),
            "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
            "before": before,
            "after": reopened,
            "alreadyRemoved": already_removed,
            "poll": poll,
            "operatorStatus": "FINISHED" if changed else "SKIPPED_ALREADY_APPLIED",
            "mainMutation": "ACTIVE_COLLECTION_REMOVED" if changed else "ACTIVE_COLLECTION_ALREADY_REMOVED",
            "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("armature-collection-remove-desktop-ok poll=true removed=active saveReopen=exact")
    finally:
        temporary_path.unlink(missing_ok=True)


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