from __future__ import annotations

from dataclasses import dataclass
from typing import Dict, List, Optional

from PyQt6.QtCore import Qt, QTimer
from PyQt6.QtWidgets import QLabel, QHBoxLayout, QWidget


@dataclass
class TargetDisplay:
    key: str
    label: str


class TargetBar(QWidget):
    """Zeigt die konfigurierten Ziele als Leiste an und erlaubt visuelles Highlighting."""

    def __init__(self, parent: Optional[QWidget] = None) -> None:
        super().__init__(parent)

        self._layout = QHBoxLayout(self)
        self._layout.setContentsMargins(8, 4, 8, 4)
        self._layout.setSpacing(12)

        self._labels: Dict[str, QLabel] = {}

    def set_targets(self, targets: List[TargetDisplay]) -> None:
        # Alte Widgets entfernen
        while self._layout.count():
            item = self._layout.takeAt(0)
            w = item.widget()
            if w is not None:
                w.deleteLater()
        self._labels.clear()

        for t in targets:
            text = t.label or f"Ziel {t.key}"
            lbl = QLabel(text, self)
            lbl.setAlignment(Qt.AlignmentFlag.AlignCenter)
            lbl.setProperty("targetKey", t.key)
            lbl.setStyleSheet(
                "QLabel { padding: 4px 10px; border-radius: 4px; border: 1px solid #888; }"
            )
            self._layout.addWidget(lbl)
            self._labels[t.key] = lbl

        self._layout.addStretch(1)

    def highlight_target(self, key: str, duration_ms: int = 200) -> None:
        lbl = self._labels.get(key)
        if not lbl:
            return

        original = lbl.styleSheet()
        lbl.setStyleSheet(
            "QLabel { padding: 4px 10px; border-radius: 4px; border: 2px solid #0078d7; "
            "background-color: #e0f0ff; }"
        )

        def reset() -> None:
            lbl.setStyleSheet(original)

        QTimer.singleShot(duration_ms, reset)