"""
Main Window — Main application shell with tabbed interface.
"""

from PyQt6.QtWidgets import QMainWindow, QTabWidget, QVBoxLayout, QWidget, QLabel
from PyQt6.QtCore import Qt

from core.audio_device import DeviceManager
from core.eq_engine import EQEngine
from core.tape_processor import TapeProcessor
from core.audio_player import AudioPlayer
from core.audio_recorder import AudioRecorder

from ui.device_panel import DevicePanel
from ui.player_panel import PlayerPanel
from ui.calibration_panel import CalibrationPanel
from ui.eq_panel import EQPanel

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Tape Recorder Pro - Auto-Calibrating EQ")
        self.resize(1000, 700)
        
        # --- Initialize Core Audio Engine ---
        self.device_manager = DeviceManager.instance()
        self.device_manager.auto_select_defaults()
        self.eq_engine = EQEngine()
        self.tape_processor = TapeProcessor(self.device_manager.sample_rate)
        
        self.player = AudioPlayer(self.eq_engine, self.tape_processor, self.device_manager)
        self.recorder = AudioRecorder(self.device_manager)
        
        self._init_ui()
        self._update_status()

    def _init_ui(self):
        # Central widget and layout
        central_widget = QWidget()
        self.setCentralWidget(central_widget)
        
        layout = QVBoxLayout(central_widget)
        layout.setContentsMargins(10, 10, 10, 10)
        
        # Tabs
        self.tabs = QTabWidget()
        
        # 1. Device Setup Tab
        self.device_panel = DevicePanel(self.device_manager)
        self.device_panel.devices_changed.connect(self._update_status)
        self.tabs.addTab(self.device_panel, "🔊 Devices")
        
        # 2. Calibration Tab
        self.calibration_panel = CalibrationPanel(self.device_manager, self.eq_engine, self.tape_processor)
        self.calibration_panel.calibration_complete.connect(self._on_calibration_complete)
        self.tabs.addTab(self.calibration_panel, "📐 Calibrate")
        
        # 3. EQ Tab
        self.eq_panel = EQPanel(self.eq_engine, self.tape_processor)
        self.tabs.addTab(self.eq_panel, "🎚️ EQ")
        
        # 4. Player Tab
        self.player_panel = PlayerPanel(self.player)
        self.tabs.addTab(self.player_panel, "▶️ Player")
        
        layout.addWidget(self.tabs)
        
        # Status Bar
        self.statusBar().showMessage("Ready")
        
        # Persistent device info labels in status bar
        self.in_status_lbl = QLabel("Input: None")
        self.out_status_lbl = QLabel("Output: None")
        self.statusBar().addPermanentWidget(self.in_status_lbl)
        self.statusBar().addPermanentWidget(self.out_status_lbl)

    def _update_status(self):
        """Update status bar with current device names."""
        in_id = self.device_manager.input_device_id
        if in_id is not None:
            dev = self.device_manager.get_device_by_index(in_id)
            name = dev.name if dev else "Unknown"
            # truncate long names
            if len(name) > 30: name = name[:27] + "..."
            self.in_status_lbl.setText(f"In: {name}")
        else:
            self.in_status_lbl.setText("In: None")
            
        out_id = self.device_manager.output_device_id
        if out_id is not None:
            dev = self.device_manager.get_device_by_index(out_id)
            name = dev.name if dev else "Unknown"
            if len(name) > 30: name = name[:27] + "..."
            self.out_status_lbl.setText(f"Out: {name}")
        else:
            self.out_status_lbl.setText("Out: None")

    def _on_calibration_complete(self, bands):
        """Called when calibration finishes successfully."""
        # Refresh the EQ UI to show the newly computed bands
        self.eq_panel.refresh_ui()
        # Switch to the EQ tab so the user can see the result
        self.tabs.setCurrentWidget(self.eq_panel)