"""Vista de alarmas activas (Sprint 6).

Renderiza eventos `alarm_event` y `tag_update` para mantener el contador.
ACK individual emite signal `acknowledged(alarm_id)`.
"""

from __future__ import annotations

from PySide6.QtCore import Signal
from PySide6.QtGui import QColor
from PySide6.QtWidgets import (
    QAbstractItemView,
    QHBoxLayout,
    QHeaderView,
    QLabel,
    QPushButton,
    QTableWidget,
    QTableWidgetItem,
    QVBoxLayout,
    QWidget,
)

from vmssailor.studio.theme import (
    C_EMERGENCY,
    C_FOG,
    C_HIGH,
    C_INFO,
    C_WARN,
    mono_font,
    ui_font,
)

_PRIORITY_COLORS = {
    "emergency": C_EMERGENCY,
    "high": C_HIGH,
    "low": C_WARN,
    "info": C_INFO,
}


class AlarmsView(QWidget):
    """Panel de alarmas: tabla + botones ACK."""

    acknowledged = Signal(str)
    """Emite el `alarm_id` al solicitar ACK."""

    def __init__(self, parent: QWidget | None = None) -> None:
        super().__init__(parent)
        self._alarms: dict[str, dict] = {}

        outer = QVBoxLayout(self)
        outer.setContentsMargins(20, 20, 20, 20)
        outer.setSpacing(12)

        title_row = QHBoxLayout()
        title = QLabel("Alarmas")
        title.setFont(ui_font(20))
        title.setStyleSheet(f"color: {C_EMERGENCY}; font-weight: 600;")
        title_row.addWidget(title)
        title_row.addStretch(1)

        self._counter = QLabel("0 activas")
        self._counter.setFont(mono_font(11))
        self._counter.setStyleSheet(f"color: {C_FOG};")
        title_row.addWidget(self._counter)
        outer.addLayout(title_row)

        # Table
        self._table = QTableWidget(0, 6)
        self._table.setHorizontalHeaderLabels(
            ["ID", "Tag", "Prioridad", "Estado", "Mensaje", "Acción"]
        )
        self._table.horizontalHeader().setSectionResizeMode(4, QHeaderView.ResizeMode.Stretch)
        self._table.verticalHeader().setVisible(False)
        self._table.setSelectionBehavior(QAbstractItemView.SelectionBehavior.SelectRows)
        self._table.setEditTriggers(QAbstractItemView.EditTrigger.NoEditTriggers)
        outer.addWidget(self._table, 1)

    def handle_event(self, event: dict) -> None:
        if event.get("type") != "alarm_event":
            return
        alarm_id = event.get("alarm_id") or event.get("id")
        if not alarm_id:
            return
        state = event.get("state", "active")
        if state == "cleared":
            # Quitar
            self._alarms.pop(alarm_id, None)
        else:
            self._alarms[alarm_id] = event
        self._refresh_table()

    def _refresh_table(self) -> None:
        self._table.setRowCount(0)
        for alarm_id, a in self._alarms.items():
            row = self._table.rowCount()
            self._table.insertRow(row)
            self._table.setItem(row, 0, QTableWidgetItem(alarm_id[:24]))
            self._table.setItem(row, 1, QTableWidgetItem(str(a.get("tag_id", ""))))
            priority = a.get("priority", "—")
            prio_item = QTableWidgetItem(priority)
            prio_item.setForeground(QColor(_PRIORITY_COLORS.get(priority, C_FOG)))
            self._table.setItem(row, 2, prio_item)
            self._table.setItem(row, 3, QTableWidgetItem(a.get("state", "")))
            self._table.setItem(row, 4, QTableWidgetItem(a.get("message", "")))
            btn = QPushButton("ACK")
            btn.clicked.connect(lambda _checked=False, aid=alarm_id: self.acknowledged.emit(aid))
            self._table.setCellWidget(row, 5, btn)

        self._counter.setText(f"{len(self._alarms)} activas")