"""
ShortSmith v2 - Configuration Module

Centralized configuration for all components including model paths,
thresholds, domain presets, and runtime settings.
"""

import os
from dataclasses import dataclass, field
from typing import Dict, Optional
from enum import Enum


class ContentDomain(Enum):
    """Supported content domains with different hype characteristics."""
    SPORTS = "sports"
    VLOGS = "vlogs"
    MUSIC = "music"
    PODCASTS = "podcasts"
    GAMING = "gaming"
    GENERAL = "general"


@dataclass
class DomainWeights:
    """Weight configuration for visual vs audio scoring per domain."""
    visual_weight: float
    audio_weight: float
    motion_weight: float = 0.0

    def __post_init__(self):
        """Normalize weights to sum to 1.0."""
        total = self.visual_weight + self.audio_weight + self.motion_weight
        if total > 0:
            self.visual_weight /= total
            self.audio_weight /= total
            self.motion_weight /= total


# Domain-specific weight presets
DOMAIN_PRESETS: Dict[ContentDomain, DomainWeights] = {
    ContentDomain.SPORTS: DomainWeights(visual_weight=0.35, audio_weight=0.50, motion_weight=0.15),
    ContentDomain.VLOGS: DomainWeights(visual_weight=0.70, audio_weight=0.20, motion_weight=0.10),
    ContentDomain.MUSIC: DomainWeights(visual_weight=0.40, audio_weight=0.50, motion_weight=0.10),
    ContentDomain.PODCASTS: DomainWeights(visual_weight=0.10, audio_weight=0.85, motion_weight=0.05),
    ContentDomain.GAMING: DomainWeights(visual_weight=0.50, audio_weight=0.35, motion_weight=0.15),
    ContentDomain.GENERAL: DomainWeights(visual_weight=0.50, audio_weight=0.40, motion_weight=0.10),
}


@dataclass
class ModelConfig:
    """Configuration for AI models."""
    # Visual model (Qwen2-VL)
    visual_model_id: str = "Qwen/Qwen2-VL-2B-Instruct"
    visual_model_quantization: str = "int4"  # Options: "int4", "int8", "none"
    visual_max_frames: int = 32

    # Audio model
    audio_model_id: str = "facebook/wav2vec2-base-960h"
    use_advanced_audio: bool = False  # Use Wav2Vec2 instead of just Librosa

    # Face recognition (InsightFace)
    face_detection_model: str = "buffalo_l"  # SCRFD model
    face_similarity_threshold: float = 0.4

    # Body recognition (OSNet)
    body_model_name: str = "osnet_x1_0"
    body_similarity_threshold: float = 0.5

    # Motion detection (RAFT)
    motion_model: str = "raft-things"
    motion_threshold: float = 5.0

    # Device settings
    device: str = "cuda"  # Options: "cuda", "cpu", "mps"

    def __post_init__(self):
        """Validate and adjust device based on availability."""
        import torch
        if self.device == "cuda" and not torch.cuda.is_available():
            self.device = "cpu"
        elif self.device == "mps" and not (hasattr(torch.backends, "mps") and torch.backends.mps.is_available()):
            self.device = "cpu"


@dataclass
class ProcessingConfig:
    """Configuration for video processing pipeline."""
    # Sampling settings
    coarse_sample_interval: float = 5.0  # Seconds between frames in first pass
    dense_sample_fps: float = 3.0  # FPS for dense sampling on candidates
    min_motion_for_dense: float = 2.0  # Threshold to trigger dense sampling

    # Clip settings
    min_clip_duration: float = 10.0  # Minimum clip length in seconds
    max_clip_duration: float = 20.0  # Maximum clip length in seconds
    default_clip_duration: float = 15.0  # Default clip length
    min_gap_between_clips: float = 30.0  # Minimum gap between clip starts

    # Output settings
    default_num_clips: int = 3
    max_num_clips: int = 10
    output_format: str = "mp4"
    output_codec: str = "libx264"
    output_audio_codec: str = "aac"

    # Scene detection
    scene_threshold: float = 27.0  # PySceneDetect threshold

    # Hype scoring
    hype_threshold: float = 0.3  # Minimum normalized score to consider
    diversity_weight: float = 0.2  # Weight for temporal diversity in ranking

    # Performance
    batch_size: int = 8  # Frames per batch for model inference
    max_video_duration: float = 3600.0  # Maximum video length (1 hour)

    # Temporary files
    temp_dir: Optional[str] = None
    cleanup_temp: bool = True


@dataclass
class AppConfig:
    """Main application configuration."""
    model: ModelConfig = field(default_factory=ModelConfig)
    processing: ProcessingConfig = field(default_factory=ProcessingConfig)

    # Logging
    log_level: str = "INFO"
    log_file: Optional[str] = "shortsmith.log"
    log_to_console: bool = True

    # API settings (for future extensibility)
    api_key: Optional[str] = None

    # UI settings
    share_gradio: bool = False
    server_port: int = 7860

    @classmethod
    def from_env(cls) -> "AppConfig":
        """Create configuration from environment variables."""
        config = cls()

        # Override from environment
        if os.environ.get("SHORTSMITH_LOG_LEVEL"):
            config.log_level = os.environ["SHORTSMITH_LOG_LEVEL"]

        if os.environ.get("SHORTSMITH_DEVICE"):
            config.model.device = os.environ["SHORTSMITH_DEVICE"]

        if os.environ.get("SHORTSMITH_API_KEY"):
            config.api_key = os.environ["SHORTSMITH_API_KEY"]

        if os.environ.get("HF_TOKEN"):
            # HuggingFace token for accessing gated models
            pass

        return config


# Global configuration instance
_config: Optional[AppConfig] = None


def get_config() -> AppConfig:
    """Get the global configuration instance."""
    global _config
    if _config is None:
        _config = AppConfig.from_env()
    return _config


def set_config(config: AppConfig) -> None:
    """Set the global configuration instance."""
    global _config
    _config = config


# Export commonly used items
__all__ = [
    "ContentDomain",
    "DomainWeights",
    "DOMAIN_PRESETS",
    "ModelConfig",
    "ProcessingConfig",
    "AppConfig",
    "get_config",
    "set_config",
]