"""
ui/config_dialog.py  —  Device configuration dialog (tabbed).
"""

from PyQt6.QtWidgets import (
    QDialog, QVBoxLayout, QHBoxLayout, QTabWidget,
    QWidget, QFormLayout, QGroupBox, QScrollArea,
    QLabel, QLineEdit, QDoubleSpinBox, QCheckBox,
    QPushButton,
)
from PyQt6.QtCore import Qt


class DeviceConfigDialog(QDialog):
    def __init__(self, device, parent=None):
        super().__init__(parent)
        self.device = device
        self.setWindowTitle(f"Configure  —  {device.info.name}  [{device.info.device_id}]")
        self.setMinimumSize(520, 460)
        self._build()

    def _build(self):
        layout = QVBoxLayout(self)
        layout.setSpacing(8)

        tabs = QTabWidget()

        # ── Tab 1: Device-specific widget ────────────────────────────
        scroll = QScrollArea()
        scroll.setWidgetResizable(True)
        scroll.setWidget(self.device.get_config_widget())
        tabs.addTab(scroll, "Hardware / Backend")

        # ── Tab 2: Channel settings ───────────────────────────────────
        tabs.addTab(self._channel_tab(), "Channels & Alarms")

        # ── Tab 3: Device info ────────────────────────────────────────
        tabs.addTab(self._info_tab(), "Info")

        layout.addWidget(tabs)

        btn_row = QHBoxLayout()
        btn_row.addStretch()
        close_btn = QPushButton("Close")
        close_btn.setDefault(True)
        close_btn.clicked.connect(self.accept)
        btn_row.addWidget(close_btn)
        layout.addLayout(btn_row)

    def _channel_tab(self):
        w = QScrollArea()
        w.setWidgetResizable(True)
        container = QWidget()
        layout = QVBoxLayout(container)

        for ch in self.device.info.channels:
            grp  = QGroupBox(f"{ch.channel_id}  —  {ch.name}")
            form = QFormLayout(grp)

            name_e = QLineEdit(ch.name)
            unit_e = QLineEdit(ch.unit)
            en_chk = QCheckBox()
            en_chk.setChecked(ch.enabled)

            lo = QDoubleSpinBox(); lo.setRange(-1e9, 1e9); lo.setValue(ch.alarm_low or 0.0)
            hi = QDoubleSpinBox(); hi.setRange(-1e9, 1e9); hi.setValue(ch.alarm_high or 100.0)

            form.addRow("Name:",       name_e)
            form.addRow("Unit:",       unit_e)
            form.addRow("Enabled:",    en_chk)
            form.addRow("Alarm Low:",  lo)
            form.addRow("Alarm High:", hi)

            apply = QPushButton("Apply")
            apply.setObjectName("applyButton")

            def _make_apply(c, ne, ue, ec, ls, hs):
                def _do():
                    c.name       = ne.text()
                    c.unit       = ue.text()
                    c.enabled    = ec.isChecked()
                    c.alarm_low  = ls.value()
                    c.alarm_high = hs.value()
                return _do

            apply.clicked.connect(_make_apply(ch, name_e, unit_e, en_chk, lo, hi))
            form.addRow(apply)
            layout.addWidget(grp)

        layout.addStretch()
        w.setWidget(container)
        return w

    def _info_tab(self):
        w = QWidget()
        form = QFormLayout(w)
        info = self.device.info

        def _ro(v):
            e = QLineEdit(str(v)); e.setReadOnly(True); return e

        form.addRow("Device ID:",    _ro(info.device_id))
        form.addRow("Name:",         _ro(info.name))
        form.addRow("Type:",         _ro(info.device_type))
        form.addRow("Description:",  _ro(info.description))
        form.addRow("Manufacturer:", _ro(info.manufacturer))
        form.addRow("Model:",        _ro(info.model))
        form.addRow("Version:",      _ro(info.version))
        form.addRow("Status:",       _ro(self.device.status.value))
        form.addRow("Channels:",     _ro(len(info.channels)))
        return w