"""Compatibility adapter for the canonical system identity file."""

from __future__ import annotations

import json
import os
import tempfile
from pathlib import Path
from typing import Any

from bfos.operations import dealer_is_valid
from bfos.identity import DEALER_ID_FILE, identity_for, read_dealer_id

PREFERENCES_FILENAME = "blueforce-gui.json"


def preferences_path() -> Path:
    return Path(os.environ.get("BF_DEALER_ID_FILE", str(DEALER_ID_FILE)))


def load_preferences(path: Path | None = None) -> dict[str, str]:
    target = path or preferences_path()
    if path is None:
        try:
            return identity_for(read_dealer_id(target))
        except (OSError, ValueError):
            return {}
    try:
        data: Any = json.loads(target.read_text(encoding="utf-8"))
    except (OSError, ValueError):
        return {}
    if not isinstance(data, dict):
        return {}
    dealer = str(data.get("dealer_id", "")).strip()
    if not dealer_is_valid(dealer):
        return {}
    return identity_for(dealer)


def save_dealer(dealer_id: str, path: Path | None = None) -> dict[str, str]:
    if not dealer_is_valid(dealer_id):
        raise ValueError("Bayi numarası tam 8 rakam olmalıdır.")
    target = path or preferences_path()
    identity = identity_for(dealer_id)
    if path is None and target.exists():
        existing = read_dealer_id(target)
        if existing != dealer_id:
            raise PermissionError(
                f"Bayi kimliği {existing} olarak kilitli; değiştirmek için açık geçiş gerekir."
            )
    if path is None:
        target.parent.mkdir(parents=True, exist_ok=True)
        fd, temporary_name = tempfile.mkstemp(prefix="dealer-id.", dir=str(target.parent))
        try:
            os.fchmod(fd, 0o600)
            with os.fdopen(fd, "w", encoding="utf-8") as handle:
                handle.write(dealer_id + "\n")
            os.replace(temporary_name, target)
        finally:
            if os.path.exists(temporary_name):
                os.unlink(temporary_name)
        return identity
    target.parent.mkdir(parents=True, exist_ok=True)
    data = {"dealer_id": dealer_id, "active_user": f"bf-{dealer_id}"}
    temporary = target.with_suffix(target.suffix + ".tmp")
    temporary.write_text(json.dumps(data, ensure_ascii=False, indent=2) + "\n", encoding="utf-8")
    os.replace(temporary, target)
    return identity


def clear_dealer(path: Path | None = None) -> None:
    target = path or preferences_path()
    try:
        target.unlink()
    except FileNotFoundError:
        pass