"""设置页的事件绑定和当前客户端设备号生成。

本文件把界面操作转换为轻量信号，不直接执行 ADB 或 SQLite。
后续应用服务应在后台线程处理阻塞操作，再通过页面更新方法返回结果。
"""

import hashlib
import platform
import uuid

from PyQt5.QtCore import QObject, pyqtSignal, pyqtSlot


DEVICE_ID_PLACEHOLDER = "待生成"


def generate_client_device_id() -> str:
    """根据本机特征生成设备号，不暴露原始系统和硬件信息。"""

    fingerprint = "|".join(
        (
            platform.system(),
            platform.node(),
            platform.machine(),
            f"{uuid.getnode():012x}",
        )
    )
    digest = hashlib.sha256(fingerprint.encode("utf-8")).hexdigest()[:16].upper()
    return f"CLIENT-{digest}"


class SettingsPageEventBinder(QObject):
    """绑定设备管理控件，并向应用层发出稳定事件。"""

    searchRequested = pyqtSignal()
    connectRequested = pyqtSignal(str)
    currentDeviceSaveRequested = pyqtSignal(str, str)
    saveRequested = pyqtSignal(str, str)
    deleteRequested = pyqtSignal(str)

    def __init__(self, page):
        super().__init__(page)
        self._page = page
        self._busy = False

        page.currentDeviceSaveButton.clicked.connect(
            self._request_save_current_device
        )
        page.searchButton.clicked.connect(self._request_search)
        page.connectButton.clicked.connect(self._request_connect)
        page.saveButton.clicked.connect(self._request_save)
        page.deleteButton.clicked.connect(self._request_delete)
        page.addressInput.textChanged.connect(self._sync_button_state)
        page.deviceTableModel.checkedDeviceChanged.connect(self._sync_button_state)
        self._sync_button_state()

    @pyqtSlot()
    def _request_save_current_device(self) -> None:
        if self._busy:
            return

        device_id = self._page.deviceIdInput.text().strip()
        if not device_id or device_id == DEVICE_ID_PLACEHOLDER:
            device_id = generate_client_device_id()
            self._page.deviceIdInput.setText(device_id)

        device_name = self._page.deviceNameInput.text().strip()
        self._page.deviceNameInput.setText(device_name)
        self.currentDeviceSaveRequested.emit(device_id, device_name)

    @pyqtSlot()
    def _request_search(self) -> None:
        if self._busy:
            return
        self.searchRequested.emit()

    @pyqtSlot()
    def _request_connect(self) -> None:
        if self._busy:
            return

        address = self._page.addressInput.text().strip()
        if not address:
            self._page.deviceStatusLabel.setText(
                "连接失败：请先填写无线调试地址，例如 192.168.0.173:5555"
            )
            self._page.addressInput.setFocus()
            return
        self.connectRequested.emit(address)

    @pyqtSlot()
    def _request_save(self) -> None:
        if self._busy:
            return

        serial = self._page.deviceTableModel.checked_serial
        if not serial:
            self._page.deviceStatusLabel.setText("保存失败：请先勾选一台已连接设备")
            self._page.deviceTable.setFocus()
            return

        device_name = self._page.deviceNameInput.text().strip()
        self.saveRequested.emit(device_name, serial)

    @pyqtSlot()
    def _request_delete(self) -> None:
        if self._busy:
            return

        serial = self._page.deviceTableModel.checked_serial
        if not serial:
            self._page.deviceStatusLabel.setText("删除失败：请先勾选一台设备")
            self._page.deviceTable.setFocus()
            return
        self.deleteRequested.emit(serial)

    @pyqtSlot()
    def _sync_button_state(self, *_args) -> None:
        serial = self._page.deviceTableModel.checked_serial
        has_address = bool(self._page.addressInput.text().strip())
        self._page.currentDeviceSaveButton.setEnabled(not self._busy)
        self._page.searchButton.setEnabled(not self._busy)
        self._page.connectButton.setEnabled(not self._busy and has_address)
        self._page.saveButton.setEnabled(not self._busy and bool(serial))
        self._page.deleteButton.setEnabled(not self._busy and bool(serial))

    def set_busy(self, busy: bool, message: str = "") -> None:
        """切换界面忙碌状态，防止用户重复提交设备命令。"""

        self._busy = busy
        self._sync_button_state()
        if message:
            self._page.deviceStatusLabel.setText(message)