"""
Speaker Diarization Module
Pyannote-audio ile konuşmacı ayrımı (kim ne zaman konuşuyor).
"""

import os
from typing import List, Tuple, Optional

# PyTorch 2.6+ compatibility: Disable weights_only restriction for pyannote models
os.environ["TORCH_FORCE_NO_WEIGHTS_ONLY_LOAD"] = "1"

import torch

# Check for GPU availability
DEVICE = torch.device("cuda" if torch.cuda.is_available() else "cpu")
print(f"🔧 Diarization device: {DEVICE}")


def get_diarization_pipeline(hf_token: Optional[str] = None):
    """
    Load pyannote speaker diarization pipeline.
    
    Args:
        hf_token: Hugging Face token (required for pyannote models)
        
    Returns:
        Diarization pipeline or None if failed
    """
    try:
        from pyannote.audio import Pipeline
        
        # Try to get token from environment if not provided
        token = hf_token or os.environ.get("HF_TOKEN")
        
        if not token:
            print("⚠️ HF_TOKEN bulunamadı. pyannote modeli yüklenemeyebilir.")
        
        pipeline = Pipeline.from_pretrained(
            "pyannote/speaker-diarization-3.1",
            token=token
        )
        
        # Move to GPU if available
        pipeline.to(DEVICE)
        
        print("✅ Diarization pipeline yüklendi!")
        return pipeline
        
    except Exception as e:
        print(f"❌ Diarization pipeline yüklenemedi: {e}")
        return None


def diarize_audio(audio_path: str, pipeline, num_speakers: int = None) -> List[Tuple[float, float, str]]:
    """
    Perform speaker diarization on audio file.
    
    Args:
        audio_path: Path to audio file
        pipeline: Pyannote diarization pipeline
        num_speakers: Expected number of speakers (None for auto-detect)
        
    Returns:
        List of (start_time, end_time, speaker_label) tuples
    """
    if pipeline is None:
        return []
    
    try:
        # Run diarization - let pyannote auto-detect if num_speakers not specified
        print(f"🔍 Diarization parametreleri: num_speakers={num_speakers}")
        
        if num_speakers:
            # Use min/max range for better detection
            result = pipeline(audio_path, min_speakers=2, max_speakers=num_speakers)
        else:
            # Auto-detect number of speakers
            result = pipeline(audio_path)
        
        # Extract segments from DiarizeOutput object
        segments = []
        
        # DiarizeOutput has speaker_diarization attribute which is the Annotation
        if hasattr(result, 'speaker_diarization'):
            diarization = result.speaker_diarization
            print(f"🔍 Using speaker_diarization attribute")
        else:
            diarization = result
        
        # Now iterate over the Annotation object
        unique_speakers = set()
        for segment, track, speaker in diarization.itertracks(yield_label=True):
            segments.append((segment.start, segment.end, speaker))
            unique_speakers.add(speaker)
        
        print(f"✅ Diarization tamamlandı: {len(segments)} segment, {len(unique_speakers)} konuşmacı")
        print(f"🔍 Bulunan konuşmacılar: {unique_speakers}")
        return segments
        
    except Exception as e:
        print(f"❌ Diarization hatası: {e}")
        return []


def format_speaker_label(speaker: str) -> str:
    """
    Convert pyannote speaker labels (SPEAKER_00, SPEAKER_01) to user-friendly format.
    """
    speaker_map = {
        "SPEAKER_00": "Kişi 1",
        "SPEAKER_01": "Kişi 2",
        "SPEAKER_02": "Kişi 3",
        "SPEAKER_03": "Kişi 4",
    }
    return speaker_map.get(speaker, speaker)


def format_timestamp(seconds: float) -> str:
    """
    Convert seconds to [HH:MM:SS] or [MM:SS] format.
    """
    hours = int(seconds // 3600)
    minutes = int((seconds % 3600) // 60)
    secs = int(seconds % 60)
    
    if hours > 0:
        return f"{hours:02d}:{minutes:02d}:{secs:02d}"
    else:
        return f"{minutes:02d}:{secs:02d}"