"""
Parameter Slider Widget

Slider widget with label and value display for parameter adjustment.
"""

from PyQt5.QtWidgets import QWidget, QHBoxLayout, QLabel, QSlider
from PyQt5.QtCore import Qt, pyqtSignal
from PyQt5.QtGui import QFont


class ParameterSlider(QWidget):
    """
    Slider widget for parameter adjustment.
    
    Signals:
        value_changed: Emitted when slider value changes (int)
    """
    
    value_changed = pyqtSignal(int)
    
    def __init__(self, label: str, min_val: int = 0, max_val: int = 100,
                 default_val: int = 50, value_format: str = "{}",
                 parent=None):
        super().__init__(parent)
        self.value_format = value_format
        self.init_ui(label, min_val, max_val, default_val)
        
    def init_ui(self, label: str, min_val: int, max_val: int, default_val: int):
        """Initialize the slider UI."""
        layout = QHBoxLayout(self)
        layout.setContentsMargins(0, 5, 0, 5)
        layout.setSpacing(10)
        
        # Label
        label_widget = QLabel(label + ":")
        label_widget.setFont(QFont("Arial", 9))
        label_widget.setMinimumWidth(70)
        layout.addWidget(label_widget)
        
        # Slider
        self.slider = QSlider(Qt.Horizontal)
        self.slider.setMinimum(min_val)
        self.slider.setMaximum(max_val)
        self.slider.setValue(default_val)
        self.slider.valueChanged.connect(self._on_value_changed)
        self.slider.setStyleSheet("""
            QSlider::groove:horizontal {
                background: #ecf0f1;
                height: 15px;
                border: 1px solid #bdc3c7;
                border-radius: 2px;
            }
            QSlider::handle:horizontal {
                background: #3498db;
                width: 20px;
                margin: -3px 0;
                border-radius: 3px;
            }
            QSlider::sub-page:horizontal {
                background: #3498db;
                border-radius: 2px;
            }
        """)
        layout.addWidget(self.slider, 1)
        
        # Value label
        self.value_label = QLabel(self.value_format.format(default_val))
        self.value_label.setFont(QFont("Arial", 9))
        self.value_label.setMinimumWidth(60)
        self.value_label.setStyleSheet("color: #2c3e50;")
        layout.addWidget(self.value_label)
        
    def _on_value_changed(self, value: int):
        """Handle slider value changes."""
        self.value_label.setText(self.value_format.format(value))
        self.value_changed.emit(value)
        
    def get_value(self) -> int:
        """Get current slider value."""
        return self.slider.value()
        
    def set_value(self, value: int):
        """Set slider value."""
        self.slider.setValue(value)