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

import bpy


ARMATURE_NAME = "WebGapArmatureCollectionAssignArmature"
OBJECT_NAME = "WebGapArmatureCollectionAssignObject"
SOURCE_COLLECTION = "WebGapArmatureCollectionAssignSource"
TARGET_COLLECTION = "WebGapArmatureCollectionAssignTarget"
BONE_NAME = "WebGapArmatureCollectionAssignBone"


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_assign 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]
    edit_bone = armature.edit_bones[BONE_NAME]
    bpy.ops.armature.select_all(action="DESELECT")
    edit_bone.select = True
    edit_bone.select_head = True
    edit_bone.select_tail = True
    armature.bones.active = armature.bones[BONE_NAME]
    poll = bool(bpy.ops.armature.collection_assign.poll())
    if not poll:
        raise RuntimeError("ARMATURE_OT_collection_assign poll failed")
    if not already_assigned:
        result = bpy.ops.armature.collection_assign(name=TARGET_COLLECTION)
        if result != {"FINISHED"}:
            raise RuntimeError(f"ARMATURE_OT_collection_assign returned {result}")
    bpy.ops.object.mode_set(mode="OBJECT")
    return poll, not already_assigned


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-assign-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), None)
    source_before = next((collection for collection in before["collections"] if collection["name"] == SOURCE_COLLECTION), None)
    if source_before is None or target_before is None or source_before["bones"] != [BONE_NAME]:
        raise RuntimeError(f"unexpected collection_assign input: {before}")
    already_assigned = BONE_NAME in target_before["bones"]
    poll, changed = run_operator(already_assigned)
    after = state_report()
    source_after = next((collection for collection in after["collections"] if collection["name"] == SOURCE_COLLECTION), None)
    target_after = next((collection for collection in after["collections"] if collection["name"] == TARGET_COLLECTION), None)
    if source_after is None or target_after is None or BONE_NAME not in target_after["bones"]:
        raise RuntimeError(f"collection_assign did not assign the bone: {before} -> {after}")
    if BONE_NAME not in source_after["bones"]:
        raise RuntimeError(f"collection_assign unexpectedly removed the source membership: {after}")

    descriptor, temporary = tempfile.mkstemp(prefix="m16-armature-collection-assign-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_assign save/reopen drift: {after} != {reopened}")
        shutil.copyfile(temporary_path, fixture)
        report = {
            "schemaVersion": 1,
            "task": "M16-GAP-00222",
            "operation": "ARMATURE_COLLECTION_ASSIGN_DESKTOP",
            "fixture": str(fixture),
            "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
            "before": before,
            "after": reopened,
            "alreadyAssigned": already_assigned,
            "poll": poll,
            "operatorStatus": "FINISHED" if changed else "SKIPPED_ALREADY_APPLIED",
            "mainMutation": "BONE_ASSIGNED_TO_TARGET_COLLECTION" if changed else "ALREADY_BONE_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-collection-assign-desktop-ok poll=true target=assigned saveReopen=exact")
    finally:
        temporary_path.unlink(missing_ok=True)


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