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

import bpy


ARMATURE_NAME = "WebGapArmatureAssignArmature"
OBJECT_NAME = "WebGapArmatureAssignObject"
SOURCE_COLLECTION = "WebGapArmatureAssignSource"
TARGET_COLLECTION = "WebGapArmatureAssignTarget"
PARENT_NAME = "WebGapArmatureAssignParent"
CHILD_NAME = "WebGapArmatureAssignChild"


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.assign_to_collection 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, "collections": collections}


def run_operator(already_assigned):
    bpy.context.view_layer.objects.active = bpy.data.objects[OBJECT_NAME]
    bpy.data.objects[OBJECT_NAME].select_set(True)
    if bpy.context.object.mode != "EDIT":
        bpy.ops.object.mode_set(mode="EDIT")
    armature = bpy.data.armatures[ARMATURE_NAME]
    parent = armature.edit_bones[PARENT_NAME]
    child = armature.edit_bones[CHILD_NAME]
    bpy.ops.armature.select_all(action="DESELECT")
    parent.select = False
    child.select = True
    child.select_head = True
    child.select_tail = True
    armature.bones.active = armature.bones[CHILD_NAME]
    poll = bool(bpy.ops.armature.assign_to_collection.poll())
    if not poll:
        raise RuntimeError("ARMATURE_OT_assign_to_collection poll failed")
    if not already_assigned:
        result = bpy.ops.armature.assign_to_collection(collection_index=1)
        if result != {"FINISHED"}:
            raise RuntimeError(f"ARMATURE_OT_assign_to_collection returned {result}")
    bpy.ops.object.mode_set(mode="OBJECT")
    return poll


def main():
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --factory-startup --python check-action-armature-assign-to-collection-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()
    target_before = next(collection for collection in before["collections"] if collection["name"] == TARGET_COLLECTION)
    already_assigned = CHILD_NAME in target_before["bones"]
    poll = run_operator(already_assigned)
    after = state_report()
    target_after = next(collection for collection in after["collections"] if collection["name"] == TARGET_COLLECTION)
    if CHILD_NAME not in target_after["bones"]:
        raise RuntimeError(f"assign_to_collection did not assign child: {before} -> {after}")

    descriptor, temporary = tempfile.mkstemp(prefix="m16-armature-assign-collection-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.assign_to_collection save/reopen drift: {after} != {reopened}")
        shutil.copyfile(temporary_path, fixture)
        report = {
            "schemaVersion": 1,
            "task": "M16-GAP-00216",
            "operation": "ARMATURE_ASSIGN_TO_COLLECTION_DESKTOP",
            "fixture": str(fixture),
            "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
            "before": before,
            "after": reopened,
            "alreadyAssigned": already_assigned,
            "poll": poll,
            "operatorStatus": "FINISHED",
            "mainMutation": "CHILD_ASSIGNED_TO_TARGET_COLLECTION",
            "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-assign-to-collection-desktop-ok poll=true status=FINISHED mainMutation=child_assigned_to_target_collection saveReopen=exact")
    finally:
        temporary_path.unlink(missing_ok=True)


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