"""
Audio Spectrogram Panel

Panel for displaying audio spectrogram visualization.
"""

from PyQt5.QtWidgets import QWidget, QVBoxLayout, QHBoxLayout, QLabel, QFrame, QSizePolicy
from PyQt5.QtCore import Qt, pyqtSignal
from PyQt5.QtGui import QFont, QPixmap, QCursor
from ui.widgets.panel_header import PanelHeader


class ClickableLabel(QLabel):
    """Label that emits a signal when clicked."""
    clicked = pyqtSignal()
    
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setCursor(QCursor(Qt.PointingHandCursor))
        
    def mousePressEvent(self, event):
        """Emit clicked signal on mouse press."""
        self.clicked.emit()
        super().mousePressEvent(event)


class AudioSpectrogramPanel(QWidget):
    """
    Panel for audio spectrogram display and settings.
    
    Signals:
        spectrogram_clicked: Emitted when spectrogram is clicked for enlarged view
    """
    
    spectrogram_clicked = pyqtSignal()
    
    def __init__(self, parent=None):
        super().__init__(parent)
        self.current_pixmap = None
        self.current_audio_path = None
        self.init_ui()
        
    def init_ui(self):
        """Initialize the panel UI."""
        # Set size policy to expand equally
        self.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
        
        layout = QVBoxLayout(self)
        layout.setContentsMargins(0, 0, 0, 0)
        layout.setSpacing(0)
        
        # Main panel container with card styling
        self.setStyleSheet("""
            QWidget {
                background-color: white;
                border: 1px solid #ddd;
            }
        """)
        
        # Header
        header = QWidget()
        header.setFixedHeight(25)
        header.setStyleSheet("background-color: #16a085;")
        header_layout = QHBoxLayout(header)
        header_layout.setContentsMargins(10, 0, 10, 0)
        header_layout.setSpacing(0)
        
        title = QLabel("Audio Spectrogram")
        title.setStyleSheet("color: white; font-weight: bold; font-size: 16px;")
        
        status_indicator = QWidget()
        status_indicator.setFixedSize(10, 10)
        status_indicator.setStyleSheet("background-color: #27ae60; border-radius: 5px;")
        
        header_layout.addWidget(title)
        header_layout.addStretch()
        header_layout.addWidget(status_indicator)
        
        # Visualization area
        visualization = QWidget()
        visualization.setMinimumSize(250, 250)
        # visualization.setMaximumSize(500, 500)
        visualization.setStyleSheet("""
            background-color: #2c3e50;
            border: 1px solid #34495e;
            border-top: none;
        """)
        
        visualization_layout = QVBoxLayout(visualization)
        visualization_layout.setContentsMargins(0, 0, 0, 0)
        visualization_layout.setSpacing(0)
        
        # Frequency range label
        range_label = QLabel("0-8kHz Range")
        range_label.setStyleSheet("color: #bdc3c7; font-size: 12px;")
        range_label.setAlignment(Qt.AlignCenter)
        # range_label.setFixedHeight(15)
        visualization_layout.addWidget(range_label)
        
        # Spectrogram display (clickable)
        self.spectrogram_label = ClickableLabel()
        self.spectrogram_label.setAlignment(Qt.AlignCenter)
        self.spectrogram_label.setMinimumHeight(200)
        self.spectrogram_label.setScaledContents(False)
        self.spectrogram_label.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Preferred)
        self.spectrogram_label.setStyleSheet("""
            QLabel {
                background-color: #2c3e50;
                border: none;
                color: #bdc3c7;
            }
            QLabel:hover {
                background-color: #34495e;
            }
        """)
        self.spectrogram_label.setText("No audio loaded\n\nClick to view details")
        self.spectrogram_label.setToolTip("Click to enlarge and view audio details")
        self.spectrogram_label.clicked.connect(self._on_spectrogram_clicked)
        visualization_layout.addWidget(self.spectrogram_label, 1)
        
        layout.addWidget(header)
        layout.addWidget(visualization, 1)
        
    def update_spectrogram(self, pixmap: QPixmap, sample_rate: float = 44100, 
                          duration: float = 0, audio_path: str = None):
        """
        Update the spectrogram display.
        
        Args:
            pixmap: Spectrogram image as QPixmap
            sample_rate: Audio sample rate in Hz
            duration: Audio duration in seconds
            audio_path: Path to the audio file for playback
        """
        # Store original pixmap and audio path for enlargement
        self.current_pixmap = pixmap
        self.current_audio_path = audio_path
        
        # Force widget to update geometry first
        self.spectrogram_label.updateGeometry()
        
        # Get actual dimensions, with better fallbacks
        label_width = self.spectrogram_label.width()
        label_height = self.spectrogram_label.height()
        
        # Use parent widget size if label size not yet determined
        if label_width < 100:
            parent_width = self.width() if self.width() > 100 else 380
            label_width = parent_width - 20
        
        if label_height < 100:
            label_height = 220
        
        # Scale to fit width while preserving aspect ratio
        scaled_pixmap = pixmap.scaledToWidth(
            int(label_width),
            Qt.SmoothTransformation
        )
        self.spectrogram_label.setPixmap(scaled_pixmap)
        
    def clear_spectrogram(self):
        """Clear the spectrogram display."""
        self.current_pixmap = None
        self.current_audio_path = None
        self.spectrogram_label.clear()
        self.spectrogram_label.setText("No audio loaded\n\nClick to view details")
        
    def _on_spectrogram_clicked(self):
        """Handle spectrogram click to show enlarged view with waveform and playback."""
        if self.current_pixmap is not None:
            from ui.dialogs.spectrogram_preview_dialog import SpectrogramPreviewDialog
            dialog = SpectrogramPreviewDialog(
                self.current_pixmap, 
                self.current_audio_path, 
                self
            )
            dialog.exec_()