"""Separate immutable resources from installation-owned mutable data."""
import os
import sys
from pathlib import Path
from monitor_runtime.release import RELEASE_BUILD

RESOURCE_ROOT = Path(getattr(sys, '_MEIPASS', Path(__file__).resolve().parents[1])).resolve()
if not RELEASE_BUILD and not getattr(sys, 'frozen', False) and os.environ.get('MONITOR_DEV_RESOURCE_ROOT'):
    RESOURCE_ROOT = Path(os.environ['MONITOR_DEV_RESOURCE_ROOT']).resolve()
DESKTOP = RELEASE_BUILD or bool(getattr(sys, 'frozen', False)) or os.environ.get('MONITOR_DESKTOP') == '1'
DATA_ROOT = Path(os.environ.get('MONITOR_DATA_DIR') or (
    Path(os.environ.get('PROGRAMDATA', 'C:/ProgramData')) / 'Monitor' if DESKTOP else RESOURCE_ROOT
)).resolve()


def resource(name):
    return RESOURCE_ROOT / name


def data(name):
    return DATA_ROOT / name


def public_key_path():
    if not RELEASE_BUILD and not getattr(sys, 'frozen', False):
        override = os.environ.get('MONITOR_DEV_PUBLIC_KEY')
        if override:
            return Path(override)
    return resource('license-public.pem')


def atomic_json(path, value):
    import json
    import tempfile
    path = Path(path)
    path.parent.mkdir(parents=True, exist_ok=True)
    fd, temporary = tempfile.mkstemp(prefix=path.name, suffix='.tmp', dir=path.parent)
    try:
        with os.fdopen(fd, 'w', encoding='utf-8') as handle:
            json.dump(value, handle, ensure_ascii=False, indent=2)
            handle.flush()
            os.fsync(handle.fileno())
        os.replace(temporary, path)
    finally:
        if os.path.exists(temporary):
            os.unlink(temporary)