"""
Configuration defaults and constants for Memvid
"""

from typing import Dict, Any

# QR Code settings
QR_VERSION = 35 # 1-40, higher = more data capacity https://www.qrcode.com/en/about/version.html
QR_ERROR_CORRECTION = 'M'  # L, M, Q, H
QR_BOX_SIZE = 5    # QR_BOX_SIZE * QR_VERSION dimensions (1 = 21 x 21, 20 = 97 x 97, 40 = 177×177) + QR_BORDER must be < frame height/width
QR_BORDER = 3
QR_FILL_COLOR = "black"
QR_BACK_COLOR = "white"

# Chunking settings - SIMPLIFIED
DEFAULT_CHUNK_SIZE = 1024
DEFAULT_OVERLAP = 32

# Codec Settings
VIDEO_CODEC = 'h265'        # Valid options are: mpv4, h265 or hevc, h264 or avc, and av1
MP4V_PARAMETERS= {"video_file_type": "mp4",
                  "video_fps": 15,
                  "frame_height": 256,
                  "frame_width": 256,
                  "video_crf": 18,           # Constant Rate Factor (0-51, lower = better quality, 18 is visually lossless)
                  "video_preset": "medium",  # ultrafast, superfast, veryfast, faster, fast, medium, slow, slower, veryslow
                  "video_profile": "high", # baseline, main, high (baseline for max compatibility)
                  "pix_fmt": "yuv420p",
                  "extra_ffmpeg_args": "-x265-params keyint=1:tune=stillimage"}

H265_PARAMETERS = {"video_file_type": "mkv", # AKA HEVC
                   "video_fps": 30,
                   "video_crf": 28,
                   "frame_height": 256,
                   "frame_width": 256,
                   "video_preset": "slower",
                   "video_profile": "mainstillpicture",
                   "pix_fmt": "yuv420p",
                   "extra_ffmpeg_args": "-x265-params keyint=1:tune=stillimage:no-scenecut:strong-intra-smoothing:constrained-intra:rect:amp"}

H264_PARAMETERS = {"video_file_type": "mkv", # AKA AVC
                   "video_fps": 30,
                   "video_crf": 28,
                   "frame_height": 256,
                   "frame_width": 256,
                   "video_preset": "slower",
                   "video_profile": "main",
                   "pix_fmt": "yuv420p",
                   "extra_ffmpeg_args": "-x265-params keyint=1:tune=stillimage:no-scenecut:strong-intra-smoothing:constrained-intra:rect:amp"}

AV1_PARAMETERS = {"video_file_type": "mkv",
                  "video_crf": 28,
                  "video_fps": 60,
                  "frame_height": 720,
                  "frame_width": 720,
                  "video_preset": "slower",
                  "video_profile": "mainstillpicture",
                  "pix_fmt": "yuv420p",
                  "extra_ffmpeg_args": "-x265-params keyint=1:tune=stillimage"}

codec_parameters = {"mp4v": MP4V_PARAMETERS,
                    "h265": H265_PARAMETERS, "hevc": H265_PARAMETERS,
                    "h264": H264_PARAMETERS, "avc": H264_PARAMETERS,
                    "av1": AV1_PARAMETERS}

# Retrieval settings
DEFAULT_TOP_K = 5
BATCH_SIZE = 100
MAX_WORKERS = 4  # For parallel processing
CACHE_SIZE = 1000  # Number of frames to cache

# Embedding settings
EMBEDDING_MODEL = "all-MiniLM-L6-v2"  # Fast and good quality
EMBEDDING_DIMENSION = 384

# Index settings
INDEX_TYPE = "Flat"  # Can be "IVF" for larger datasets, otherwise use Flat
NLIST = 100  # Number of clusters for IVF index

# LLM settings
DEFAULT_LLM_PROVIDER = "google"  # google, openai, anthropic
DEFAULT_LLM_MODELS = {
    "google": "gemini-2.0-flash-exp",
    "openai": "gpt-4o",
    "anthropic": "claude-3-5-sonnet-20241022"
}

MAX_TOKENS = 8192
TEMPERATURE = 0.1
CONTEXT_WINDOW = 32000

# Chat settings
MAX_HISTORY_LENGTH = 10
CONTEXT_CHUNKS_PER_QUERY = 5

# Performance settings
PREFETCH_FRAMES = 50
DECODE_TIMEOUT = 10  # seconds

def get_default_config() -> Dict[str, Any]:
    """Get default configuration dictionary"""
    return {
        "qr": {
            "version": QR_VERSION,
            "error_correction": QR_ERROR_CORRECTION,
            "box_size": QR_BOX_SIZE,
            "border": QR_BORDER,
            "fill_color": QR_FILL_COLOR,
            "back_color": QR_BACK_COLOR,
        },
        "codec": VIDEO_CODEC,
        "chunking": {
            "chunk_size": DEFAULT_CHUNK_SIZE,
            "overlap": DEFAULT_OVERLAP,
        },
        "retrieval": {
            "top_k": DEFAULT_TOP_K,
            "batch_size": BATCH_SIZE,
            "max_workers": MAX_WORKERS,
            "cache_size": CACHE_SIZE,
        },
        "embedding": {
            "model": EMBEDDING_MODEL,
            "dimension": EMBEDDING_DIMENSION,
        },
        "index": {
            "type": INDEX_TYPE,
            "nlist": NLIST,
        },
        "llm": {
            "model": DEFAULT_LLM_MODELS[DEFAULT_LLM_PROVIDER],
            "max_tokens": MAX_TOKENS,
            "temperature": TEMPERATURE,
            "context_window": CONTEXT_WINDOW,
        },
        "chat": {
            "max_history": MAX_HISTORY_LENGTH,
            "context_chunks": CONTEXT_CHUNKS_PER_QUERY,
        },
        "performance": {
            "prefetch_frames": PREFETCH_FRAMES,
            "decode_timeout": DECODE_TIMEOUT,
        }
    }

def get_codec_parameters(codec_name=None):
    """
    Get codec parameters for specified codec or all codecs

    Args:
        codec_name (str, optional): Specific codec name. If None, returns all.

    Returns:
        dict: Codec parameters
    """
    if codec_name is None:
        return codec_parameters

    if codec_name not in codec_parameters:
        raise ValueError(f"Unsupported codec: {codec_name}. Available: {list(codec_parameters.keys())}")

    return codec_parameters[codec_name]