#!/usr/bin/env python3
"""
Local Transcription CLI

Command-line version of the transcription application.
Works without GUI - perfect for testing and headless operation.
"""

import sys
import os
from pathlib import Path
import signal
import argparse

# Add project root to Python path
project_root = Path(__file__).parent
sys.path.insert(0, str(project_root))

from client.config import Config
from client.device_utils import DeviceManager
from client.audio_capture import AudioCapture
from client.noise_suppression import NoiseSuppressor
from client.transcription_engine import TranscriptionEngine


class TranscriptionCLI:
    """CLI transcription application."""

    def __init__(self, args):
        """Initialize the CLI application."""
        self.args = args
        self.config = Config()
        self.device_manager = DeviceManager()
        self.is_running = False

        # Override config with command-line arguments
        if args.model:
            self.config.set('transcription.model', args.model)
        if args.device:
            self.config.set('transcription.device', args.device)
        if args.language:
            self.config.set('transcription.language', args.language)
        if args.user:
            self.config.set('user.name', args.user)

        # Components
        self.audio_capture = None
        self.noise_suppressor = None
        self.transcription_engine = None

    def initialize(self):
        """Initialize all components."""
        print("=" * 60)
        print("Local Transcription CLI")
        print("=" * 60)

        # Device setup
        device_config = self.config.get('transcription.device', 'auto')
        self.device_manager.set_device(device_config)

        print(f"\nUser: {self.config.get('user.name', 'User')}")
        print(f"Model: {self.config.get('transcription.model', 'base')}")
        print(f"Language: {self.config.get('transcription.language', 'en')}")
        print(f"Device: {self.device_manager.current_device}")

        # Initialize transcription engine
        print(f"\nLoading Whisper model...")
        model_size = self.config.get('transcription.model', 'base')
        language = self.config.get('transcription.language', 'en')
        device = self.device_manager.get_device_for_whisper()
        compute_type = self.device_manager.get_compute_type()

        self.transcription_engine = TranscriptionEngine(
            model_size=model_size,
            device=device,
            compute_type=compute_type,
            language=language,
            min_confidence=self.config.get('processing.min_confidence', 0.5)
        )

        success = self.transcription_engine.load_model()
        if not success:
            print("❌ Failed to load model!")
            return False

        print("✓ Model loaded successfully!")

        # Initialize audio capture
        audio_device_str = self.config.get('audio.input_device', 'default')
        audio_device = None if audio_device_str == 'default' else int(audio_device_str)

        self.audio_capture = AudioCapture(
            sample_rate=self.config.get('audio.sample_rate', 16000),
            chunk_duration=self.config.get('audio.chunk_duration', 3.0),
            overlap_duration=self.config.get('audio.overlap_duration', 0.5),
            device=audio_device
        )

        # Initialize noise suppressor
        self.noise_suppressor = NoiseSuppressor(
            sample_rate=self.config.get('audio.sample_rate', 16000),
            method="noisereduce" if self.config.get('noise_suppression.enabled', True) else "none",
            strength=self.config.get('noise_suppression.strength', 0.7),
            use_vad=self.config.get('processing.use_vad', True)
        )

        print("\n✓ All components initialized!")
        return True

    def process_audio_chunk(self, audio_chunk):
        """Process an audio chunk."""
        try:
            # Apply noise suppression
            processed_audio = self.noise_suppressor.process(audio_chunk, skip_silent=True)

            # Skip if silent
            if processed_audio is None:
                return

            # Transcribe
            user_name = self.config.get('user.name', 'User')
            result = self.transcription_engine.transcribe(
                processed_audio,
                sample_rate=self.config.get('audio.sample_rate', 16000),
                user_name=user_name
            )

            # Display result
            if result:
                print(f"{result}")

        except Exception as e:
            print(f"Error processing audio: {e}")

    def run(self):
        """Run the transcription loop."""
        if not self.initialize():
            return 1

        # Setup signal handler for graceful shutdown
        def signal_handler(sig, frame):
            print("\n\nStopping transcription...")
            self.is_running = False

        signal.signal(signal.SIGINT, signal_handler)

        print("\n" + "=" * 60)
        print("🎤 Recording... (Press Ctrl+C to stop)")
        print("=" * 60)
        print()

        # Start recording
        self.is_running = True
        self.audio_capture.start_recording(callback=self.process_audio_chunk)

        # Keep running until interrupted
        try:
            while self.is_running:
                signal.pause()
        except AttributeError:
            # signal.pause() not available on Windows
            import time
            while self.is_running:
                time.sleep(0.1)

        # Cleanup
        self.audio_capture.stop_recording()
        self.transcription_engine.unload_model()

        print("\n" + "=" * 60)
        print("✓ Transcription stopped")
        print("=" * 60)

        return 0


def main():
    """Main entry point."""
    parser = argparse.ArgumentParser(
        description='Local Transcription CLI - Real-time speech-to-text'
    )
    parser.add_argument(
        '-m', '--model',
        choices=['tiny', 'base', 'small', 'medium', 'large'],
        help='Whisper model size'
    )
    parser.add_argument(
        '-d', '--device',
        choices=['cpu', 'cuda', 'auto'],
        help='Compute device'
    )
    parser.add_argument(
        '-l', '--language',
        help='Language code (e.g., en, es, fr) or "auto"'
    )
    parser.add_argument(
        '-u', '--user',
        help='User/speaker name'
    )
    parser.add_argument(
        '--list-devices',
        action='store_true',
        help='List available audio input devices'
    )

    args = parser.parse_args()

    # List devices if requested
    if args.list_devices:
        print("Available audio input devices:")
        devices = AudioCapture.get_input_devices()
        for idx, name in devices:
            print(f"  [{idx}] {name}")
        return 0

    # Run application
    app = TranscriptionCLI(args)
    return app.run()


if __name__ == "__main__":
    sys.exit(main())