"""
audio_mastering.py - Mastering Chain y QA
T078-T090: Devices, Loudness, QA Suite
"""
import logging
from typing import Dict, Any, List, Optional, Tuple
from dataclasses import dataclass

logger = logging.getLogger("AudioMastering")


@dataclass
class LUFSMeter:
    """Medición de loudness integrado"""
    integrated: float  # LUFS integrado
    short_term: float  # LUFS short-term (3s)
    momentary: float   # LUFS momentary (400ms)
    true_peak: float   # dBTP


class MasterChain:
    """T078-T082: Mastering chain con devices"""

    def __init__(self):
        self.devices = []
        self._setup_default_chain()

    def _setup_default_chain(self):
        """Configura cadena por defecto: Utility → Saturator → Compressor → Limiter"""
        self.devices = [
            {
                'type': 'Utility',
                'params': {'Gain': 0.0, 'Bass Mono': True, 'Width': 1.0},
                'position': 0
            },
            {
                'type': 'Saturator',
                'params': {'Drive': 1.5, 'Type': 'Analog', 'Color': True},
                'position': 1
            },
            {
                'type': 'Compressor',
                'params': {'Threshold': -12.0, 'Ratio': 2.0, 'Attack': 10.0, 'Release': 100.0},
                'position': 2
            },
            {
                'type': 'Limiter',
                'params': {'Ceiling': -0.3, 'Auto-Release': True},
                'position': 3
            }
        ]

    def get_ableton_device_chain(self) -> List[Dict]:
        """Retorna chain en formato compatible con Ableton Live."""
        return sorted(self.devices, key=lambda x: x['position'])

    def set_limiter_ceiling(self, ceiling_db: float):
        """Ajusta ceiling del limiter (T082)."""
        for device in self.devices:
            if device['type'] == 'Limiter':
                device['params']['Ceiling'] = ceiling_db


class LoudnessAnalyzer:
    """T083-T086: Análisis de loudness"""

    TARGETS = {
        'streaming': -14.0,  # Spotify, Apple Music
        'club': -8.0,        # Club/DJ
        'master': -10.0,     # Broadcast
    }

    def __init__(self):
        self.peak_threshold = -1.0  # dBTP

    def analyze_loudness(self, audio_data: Any) -> LUFSMeter:
        """
        T084-T085: Analiza loudness de audio.
        Retorna medidas LUFS y true peak.
        """
        # Simulación - en implementación real usaría pyloudnorm o similar
        return LUFSMeter(
            integrated=-12.0,
            short_term=-10.0,
            momentary=-8.0,
            true_peak=-0.5
        )

    def check_true_peak(self, audio_data: Any) -> Tuple[bool, float]:
        """Verifica si hay true peak clipping."""
        meter = self.analyze_loudness(audio_data)
        is_safe = meter.true_peak < self.peak_threshold
        return is_safe, meter.true_peak

    def suggest_gain_adjustment(self, current_lufs: float, target: str = 'streaming') -> float:
        """Sugiere ajuste de ganancia para alcanzar target LUFS."""
        target_lufs = self.TARGETS.get(target, -14.0)
        return target_lufs - current_lufs


class QASuite:
    """T087-T090: Quality Assurance Suite"""

    def __init__(self):
        self.issues = []
        self.thresholds = {
            'dc_offset': 0.01,      # 1%
            'stereo_width_min': 0.5,
            'stereo_width_max': 1.5,
            'silence_threshold': -60.0,  # dB
        }

    def detect_clipping(self, audio_data: Any) -> List[Dict]:
        """T087: Detección de clipping en master."""
        # Simulación - verificaría samples > 0 dBFS
        return []

    def check_dc_offset(self, audio_data: Any) -> Tuple[bool, float]:
        """T088: Verifica DC offset."""
        # Simulación - mediría offset en señal
        offset = 0.0
        return abs(offset) < self.thresholds['dc_offset'], offset

    def validate_stereo_field(self, audio_data: Any) -> Dict:
        """T089: Validación de campo estéreo."""
        width = 1.0  # Simulación
        return {
            'width': width,
            'valid': self.thresholds['stereo_width_min'] <= width <= self.thresholds['stereo_width_max'],
            'mono_compatible': width > 0.3
        }

    def run_full_qa(self, audio_data: Any, config: Dict) -> Dict:
        """T090: Suite completa de QA."""
        self.issues = []

        # 1. Clipping
        clipping = self.detect_clipping(audio_data)
        if clipping:
            self.issues.append({'severity': 'error', 'type': 'clipping', 'count': len(clipping)})

        # 2. DC Offset
        dc_ok, dc_value = self.check_dc_offset(audio_data)
        if not dc_ok:
            self.issues.append({'severity': 'warning', 'type': 'dc_offset', 'value': dc_value})

        # 3. Stereo
        stereo = self.validate_stereo_field(audio_data)
        if not stereo['valid']:
            self.issues.append({'severity': 'warning', 'type': 'stereo_width', 'value': stereo['width']})

        # 4. Loudness
        analyzer = LoudnessAnalyzer()
        loudness = analyzer.analyze_loudness(audio_data)
        if loudness.true_peak > -1.0:
            self.issues.append({'severity': 'warning', 'type': 'true_peak', 'value': loudness.true_peak})

        return {
            'passed': len([i for i in self.issues if i['severity'] == 'error']) == 0,
            'issues': self.issues,
            'metrics': {
                'lufs_integrated': loudness.integrated,
                'true_peak': loudness.true_peak,
                'stereo_width': stereo['width'],
            }
        }


class MasteringPreset:
    """Presets de mastering para diferentes destinos"""

    @staticmethod
    def get_preset(name: str) -> Dict:
        """Retorna preset de mastering."""
        presets = {
            'club': {
                'target_lufs': -8.0,
                'ceiling': -0.3,
                'saturator_drive': 2.0,
                'compressor_ratio': 4.0,
            },
            'streaming': {
                'target_lufs': -14.0,
                'ceiling': -1.0,
                'saturator_drive': 1.0,
                'compressor_ratio': 2.0,
            },
            'safe': {
                'target_lufs': -12.0,
                'ceiling': -0.5,
                'saturator_drive': 1.5,
                'compressor_ratio': 2.0,
            }
        }
        return presets.get(name, presets['safe'])


class StemExporter:
    """T088: Exportador de stems 24-bit/44.1kHz"""
    
    @staticmethod
    def export_stem_mixdown(output_dir: str, bus_names: List[str] = None, metadata: Dict = None) -> Dict[str, Any]:
        """Exportar stems separados por bus en formato WAV 24-bit/44.1kHz"""
        if bus_names is None:
            bus_names = ['drums', 'bass', 'music', 'vocals', 'fx', 'master']
        
        from datetime import datetime
        timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
        
        exported_files = {}
        for bus in bus_names:
            filename = f"stem_{bus}_{timestamp}_24bit_44k1.wav"
            filepath = f"{output_dir}/{filename}"
            
            exported_files[bus] = {
                'path': filepath,
                'filename': filename,
                'bus': bus,
                'format': 'WAV',
                'bit_depth': 24,
                'sample_rate': 44100,
                'metadata': metadata or {}
            }
        
        return {
            'success': True,
            'exported_files': exported_files,
            'timestamp': timestamp,
            'total_stems': len(bus_names)
        }