# ---------------------------------------------------------------------------
# LRU-Speicher (persistent via QSettings)
# ---------------------------------------------------------------------------
from PyQt5.QtCore import QSettings


class LruStore:
    """Speichert bis zu max_size TCP-Verbindungen persistent (host:port)."""

    def __init__(self, max_size: int = 5):
        self._max = max_size
        self._cfg = QSettings("gnss_skyplot", "connections")

    def entries(self) -> list[str]:
        val = self._cfg.value("tcp_lru", [])
        if isinstance(val, str):
            val = [val]
        return val or []

    def add(self, host: str, port: int) -> None:
        entry   = f"{host}:{port}"
        entries = [e for e in self.entries() if e != entry]
        entries.insert(0, entry)
        self._cfg.setValue("tcp_lru", entries[: self._max])
        self._cfg.sync()

    def clear(self) -> None:
        self._cfg.remove("tcp_lru")
        self._cfg.sync()

    def parse(self, entry: str) -> tuple[str, int]:
        host, port_str = entry.rsplit(":", 1)
        return host.strip(), int(port_str.strip())