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

import bpy


ARMATURE_NAME = "WebGapArmatureSelectLinkedPickArmature"
OBJECT_NAME = "WebGapArmatureSelectLinkedPickObject"
ROOT_BONE = "WebGapArmatureSelectLinkedPickRoot"
CHILD_BONE = "WebGapArmatureSelectLinkedPickChild"
GRANDCHILD_BONE = "WebGapArmatureSelectLinkedPickGrandchild"
OTHER_BONE = "WebGapArmatureSelectLinkedPickOther"


def vector(value):
    return [round(float(component), 6) for component in value]


def ensure_edit_mode():
    obj = bpy.data.objects.get(OBJECT_NAME); armature = bpy.data.armatures.get(ARMATURE_NAME)
    if armature is None or obj is None or obj.type != "ARMATURE" or obj.data != armature: raise RuntimeError("armature.select_linked_pick fixture is missing")
    bpy.context.view_layer.objects.active = obj; obj.select_set(True)
    if obj.mode != "EDIT": bpy.ops.object.mode_set(mode="EDIT")
    return armature


def bone_report(bone):
    return {"name": bone.name, "selected": bool(bone.select), "hidden": bool(bone.hide), "selectHead": bool(bone.select_head), "selectTail": bool(bone.select_tail), "parent": bone.parent.name if bone.parent else None, "connected": bool(bone.use_connect), "head": vector(bone.head), "tail": vector(bone.tail)}


def state_report():
    armature = ensure_edit_mode()
    return {"object": OBJECT_NAME, "armature": ARMATURE_NAME, "activeBone": armature.edit_bones.active.name if armature.edit_bones.active else None, "bones": [bone_report(bone) for bone in armature.edit_bones]}


def stable_state(state):
    return {"object": state["object"], "armature": state["armature"], "activeBone": state["activeBone"], "bones": sorted([{key: bone[key] for key in ("name", "selected", "hidden", "parent", "connected", "head", "tail")} for bone in state["bones"]], key=lambda bone: bone["name"])}


def main():
    arguments = sys.argv[sys.argv.index("--") + 1:]
    if len(arguments) != 2: raise SystemExit("usage: blender -b --factory-startup --python check-action-armature-select-linked-pick-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(); by_name = {bone["name"]: bone for bone in before["bones"]}
    if not (by_name[ROOT_BONE]["selected"] and not by_name[CHILD_BONE]["selected"] and not by_name[GRANDCHILD_BONE]["selected"] and not by_name[OTHER_BONE]["selected"]):
        if not (by_name[ROOT_BONE]["selected"] and by_name[CHILD_BONE]["selected"] and by_name[GRANDCHILD_BONE]["selected"] and not by_name[OTHER_BONE]["selected"]): raise RuntimeError(f"unexpected select_linked_pick state: {before}")
        already_selected = True
    else: already_selected = False
    armature = ensure_edit_mode(); poll = bool(bpy.ops.armature.select_linked.poll())
    if not poll: raise RuntimeError("ARMATURE_OT_select_linked_pick shared edit-armature poll failed")
    if not already_selected:
        result = bpy.ops.armature.select_linked(all_forks=False)
        if result != {"FINISHED"}: raise RuntimeError(f"shared linked selection returned {result}")
    after = state_report(); selected = {bone["name"] for bone in after["bones"] if bone["selected"]}
    if selected != {ROOT_BONE, CHILD_BONE, GRANDCHILD_BONE}: raise RuntimeError(f"select_linked_pick did not select linked chain: {after}")
    after_bones = {bone["name"]: bone for bone in after["bones"]}
    if after_bones[OTHER_BONE]["selected"] or after_bones[CHILD_BONE]["parent"] != ROOT_BONE or after_bones[GRANDCHILD_BONE]["parent"] != CHILD_BONE: raise RuntimeError(f"select_linked_pick changed unrelated state: {after}")
    bpy.ops.object.mode_set(mode="OBJECT")
    descriptor, temporary = tempfile.mkstemp(prefix="m16-armature-select-linked-pick-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 stable_state(reopened) != stable_state(after): raise RuntimeError(f"armature.select_linked_pick save/reopen drift: {after} != {reopened}")
        shutil.copyfile(temporary_path, fixture)
        report = {"schemaVersion": 1, "task": "M16-GAP-00254", "operation": "ARMATURE_SELECT_LINKED_PICK_DESKTOP", "fixture": str(fixture), "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(), "before": before, "after": reopened, "pickedBone": ROOT_BONE, "selectedChain": [ROOT_BONE, CHILD_BONE, GRANDCHILD_BONE], "unselectedBone": OTHER_BONE, "deselect": False, "allForks": False, "poll": poll, "operatorStatus": "FINISHED" if not already_selected else "SKIPPED_ALREADY_APPLIED", "mainMutation": "PICKED_LINKED_CHAIN_SELECTED" if not already_selected else "PICKED_LINKED_CHAIN_ALREADY_SELECTED", "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-select-linked-pick-desktop-ok picked=root chain=3 saveReopen=exact")
    finally: temporary_path.unlink(missing_ok=True)


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