"""Editable recent-address selector with portable, per-interface JSON storage."""
import json
from pathlib import Path
try:
    from PySide6.QtCore import QSignalBlocker
    from PySide6.QtWidgets import QComboBox, QSizePolicy
except ImportError:
    from PySide2.QtCore import QSignalBlocker
    from PySide2.QtWidgets import QComboBox, QSizePolicy

class AddressHistoryBox(QComboBox):
    def __init__(self, filename, parent=None):
        super().__init__(parent)
        self.filename = Path(filename)
        self.interface = 'Ethernet'
        self.history = {}
        self.setEditable(True)
        self.setSizePolicy(QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Fixed)
        self.setInsertPolicy(QComboBox.InsertPolicy.NoInsert)
        try:
            saved = json.loads(self.filename.read_text(encoding='utf8'))
            if isinstance(saved, dict):
                self.history = {key: [x for x in items if isinstance(x, str) and x.strip()][:20]
                                for key, items in saved.items() if isinstance(items, list)}
        except (OSError, ValueError):
            pass
        self.set_interface(self.interface)

    def text(self):
        return self.currentText()

    def setText(self, text):
        self.setEditText(text)

    def setPlaceholderText(self, text):
        self.lineEdit().setPlaceholderText(text)

    def set_interface(self, interface):
        self.interface = interface
        with QSignalBlocker(self):
            self.clear()
            self.addItems(self.history.get(interface, []))
            if not self.count():
                self.setEditText('')

    def remember(self):
        address = self.currentText().strip()
        if not address:
            return
        previous = self.history.get(self.interface, [])
        self.history[self.interface] = [address] + [x for x in previous if x.casefold()!=address.casefold()][:19]
        self.filename.parent.mkdir(parents=True, exist_ok=True)
        temporary = self.filename.with_suffix('.tmp')
        temporary.write_text(json.dumps(self.history, ensure_ascii=False, indent=2), encoding='utf8')
        temporary.replace(self.filename)
        self.set_interface(self.interface)