"""
Toolbar am oberen Rand: Datei-Aktionen, Zoom-Kontrolle, Ansichtsoptionen.
"""
from __future__ import annotations

from PySide6.QtWidgets import (
    QToolBar, QLabel, QSlider, QPushButton, QWidget, QHBoxLayout,
    QCheckBox,
)
from PySide6.QtCore import Signal, Qt


class MainToolbar(QToolBar):
    open_file_requested = Signal()
    save_file_requested = Signal()
    zoom_to_fit_requested = Signal()
    zoom_value_changed = Signal(float)
    show_original_toggled = Signal(bool)
    show_vectors_toggled = Signal(bool)

    def __init__(self, parent=None):
        super().__init__("Hauptwerkzeugleiste", parent)
        self.setMovable(False)
        self.setStyleSheet("""
            QToolBar {
                background: #1e1e1e;
                border-bottom: 1px solid #333;
                padding: 4px 8px;
                spacing: 8px;
            }
        """)
        self._build()

    def _build(self):
        btn_style = """
            QPushButton {
                background: #3c3c3c; color: #ddd; border: 1px solid #555;
                border-radius: 3px; padding: 5px 12px; font-size: 12px;
            }
            QPushButton:hover { background: #505050; }
        """

        # Datei öffnen
        self.btn_open = QPushButton("PNG laden")
        self.btn_open.setStyleSheet(btn_style)
        self.btn_open.clicked.connect(self.open_file_requested.emit)
        self.addWidget(self.btn_open)

        # Speichern
        self.btn_save = QPushButton("Speichern")
        self.btn_save.setStyleSheet(btn_style)
        self.btn_save.clicked.connect(self.save_file_requested.emit)
        self.addWidget(self.btn_save)

        self.addSeparator()

        # Zoom
        zoom_widget = QWidget()
        zl = QHBoxLayout(zoom_widget)
        zl.setContentsMargins(4, 0, 4, 0)
        zl.setSpacing(6)

        zl.addWidget(QLabel("Zoom:"))

        self.zoom_slider = QSlider(Qt.Orientation.Horizontal)
        self.zoom_slider.setRange(10, 3200)
        self.zoom_slider.setValue(100)
        self.zoom_slider.setFixedWidth(150)
        self.zoom_slider.valueChanged.connect(
            lambda v: self.zoom_value_changed.emit(v / 100.0)
        )
        zl.addWidget(self.zoom_slider)

        self.zoom_label = QLabel("100%")
        self.zoom_label.setFixedWidth(50)
        zl.addWidget(self.zoom_label)

        self.btn_fit = QPushButton("Einpassen")
        self.btn_fit.setStyleSheet(btn_style)
        self.btn_fit.clicked.connect(self.zoom_to_fit_requested.emit)
        zl.addWidget(self.btn_fit)

        self.addWidget(zoom_widget)

        self.addSeparator()

        # Ansichts-Toggles
        self.chk_original = QCheckBox("Original")
        self.chk_original.setChecked(True)
        self.chk_original.setStyleSheet("color: #ccc;")
        self.chk_original.toggled.connect(self.show_original_toggled.emit)
        self.addWidget(self.chk_original)

        self.chk_vectors = QCheckBox("Vektoren")
        self.chk_vectors.setChecked(True)
        self.chk_vectors.setStyleSheet("color: #ccc;")
        self.chk_vectors.toggled.connect(self.show_vectors_toggled.emit)
        self.addWidget(self.chk_vectors)

    def update_zoom_display(self, zoom: float):
        pct = int(zoom * 100)
        self.zoom_label.setText(f"{pct}%")
        self.zoom_slider.blockSignals(True)
        self.zoom_slider.setValue(pct)
        self.zoom_slider.blockSignals(False)