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

import bpy


ARMATURE_NAME = "WebGapArmatureAutosideArmature"
OBJECT_NAME = "WebGapArmatureAutosideObject"
LEFT_NAME = "WebGapArmatureAutosideLeft"
RIGHT_NAME = "WebGapArmatureAutosideRight"
LEFT_RENAMED = f"{LEFT_NAME}.L"
RIGHT_RENAMED = f"{RIGHT_NAME}.R"


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


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.autoside_names fixture is missing")
    bones = [
        {"name": bone.name, "head": vector(bone.head_local), "tail": vector(bone.tail_local)}
        for bone in armature.bones
    ]
    bones.sort(key=lambda value: value["name"])
    return {"object": OBJECT_NAME, "armature": ARMATURE_NAME, "bones": bones}


def run_operator(before):
    if {bone["name"] for bone in before["bones"]} == {LEFT_RENAMED, RIGHT_RENAMED}:
        return True, False
    if {bone["name"] for bone in before["bones"]} != {LEFT_NAME, RIGHT_NAME}:
        raise RuntimeError(f"unexpected autoside_names input: {before}")
    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")
    bpy.ops.armature.select_all(action="SELECT")
    poll = bool(bpy.ops.armature.autoside_names.poll())
    if not poll:
        raise RuntimeError("ARMATURE_OT_autoside_names poll failed")
    result = bpy.ops.armature.autoside_names(type="XAXIS")
    if result != {"FINISHED"}:
        raise RuntimeError(f"ARMATURE_OT_autoside_names returned {result}")
    bpy.ops.object.mode_set(mode="OBJECT")
    return poll, True


def main():
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --factory-startup --python check-action-armature-autoside-names-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()
    poll, changed = run_operator(before)
    after = state_report()
    names = {bone["name"] for bone in after["bones"]}
    if names != {LEFT_RENAMED, RIGHT_RENAMED}:
        raise RuntimeError(f"autoside_names did not produce expected suffixes: {before} -> {after}")

    descriptor, temporary = tempfile.mkstemp(prefix="m16-armature-autoside-names-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.autoside_names save/reopen drift: {after} != {reopened}")
        shutil.copyfile(temporary_path, fixture)
        report = {
            "schemaVersion": 1,
            "task": "M16-GAP-00217",
            "operation": "ARMATURE_AUTOSIDE_NAMES_DESKTOP",
            "fixture": str(fixture),
            "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
            "before": before,
            "after": reopened,
            "alreadyNamed": not changed,
            "poll": poll,
            "operatorStatus": "FINISHED" if changed else "SKIPPED_ALREADY_APPLIED",
            "mainMutation": "BONES_AUTOSIDE_NAMED" if changed else "ALREADY_AUTOSIDE_NAMED",
            "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-autoside-names-desktop-ok poll=true names=left-right saveReopen=exact")
    finally:
        temporary_path.unlink(missing_ok=True)


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