"""
Configuration settings for DocGenie API
"""
import os
from typing import Optional, List


class Settings:
    """API configuration settings"""
    
    # ==================== LLM Configuration ====================
    ANTHROPIC_API_KEY: str = os.getenv("ANTHROPIC_API_KEY", "")
    CLAUDE_MODEL: str = os.getenv("CLAUDE_MODEL", "claude-sonnet-4-5-20250929")
    # Backward compatibility
    LLM_MODEL: str = os.getenv("LLM_MODEL", CLAUDE_MODEL)
    
    # ==================== Handwriting Service (Stage 3) ====================
    HANDWRITING_SERVICE_URL: str = os.getenv(
        "HANDWRITING_SERVICE_URL",
        "http://localhost:8080"
    )
    RUNPOD_API_KEY: str = os.getenv("RUNPOD_API_KEY", "")
    HANDWRITING_SERVICE_TIMEOUT: int = int(os.getenv("HANDWRITING_SERVICE_TIMEOUT", "300"))
    HANDWRITING_SERVICE_MAX_RETRIES: int = int(os.getenv("HANDWRITING_SERVICE_MAX_RETRIES", "3"))
    HANDWRITING_SERVICE_ENABLED: bool = os.getenv("HANDWRITING_SERVICE_ENABLED", "false").lower() == "true"
    HANDWRITING_SERVICE_SUPPORTS_BATCH: bool = os.getenv("HANDWRITING_SERVICE_SUPPORTS_BATCH", "true").lower() == "true"
    
    # ==================== OCR Service (Stage 4) ====================
    OCR_SERVICE_URL: str = os.getenv("OCR_SERVICE_URL", "http://localhost:8000")
    OCR_SERVICE_TIMEOUT: int = int(os.getenv("OCR_SERVICE_TIMEOUT", "30"))
    OCR_SERVICE_ENABLED: bool = os.getenv("OCR_SERVICE_ENABLED", "false").lower() == "true"
    OCR_ENGINE: str = os.getenv("OCR_ENGINE", "microsoft_di")
    OCR_DPI: int = int(os.getenv("OCR_DPI", "300"))  # DPI for PDF to image conversion
    
    # Local Tesseract OCR (alternative to remote service)
    OCR_USE_LOCAL: bool = os.getenv("OCR_USE_LOCAL", "false").lower() == "true"
    OCR_TESSERACT_LANG: str = os.getenv("OCR_TESSERACT_LANG", "eng")  # Tesseract language
    OCR_TESSERACT_CONFIG: str = os.getenv("OCR_TESSERACT_CONFIG", "--psm 3")  # Tesseract config
    
    # ==================== Stage 5: Dataset Packaging ====================
    # Stage 16: BBox normalization
    BBOX_NORMALIZATION_ENABLED: bool = os.getenv("BBOX_NORMALIZATION_ENABLED", "false").lower() == "true"
    BBOX_NORMALIZATION_SCALE: str = os.getenv("BBOX_NORMALIZATION_SCALE", "0-1")  # "0-1" or "0-1000"
    
    # Stage 17: GT verification
    GT_VERIFICATION_ENABLED: bool = os.getenv("GT_VERIFICATION_ENABLED", "false").lower() == "true"
    GT_VERIFICATION_SIMILARITY_CUTOFF: float = float(os.getenv("GT_VERIFICATION_SIMILARITY_CUTOFF", "0.8"))
    GT_VERIFICATION_OVERLAP_THRESHOLD: float = float(os.getenv("GT_VERIFICATION_OVERLAP_THRESHOLD", "0.5"))
    
    # Stage 18: Analysis
    ANALYSIS_ENABLED: bool = os.getenv("ANALYSIS_ENABLED", "false").lower() == "true"
    ANALYSIS_MIN_ANNOTATION_COUNT: int = int(os.getenv("ANALYSIS_MIN_ANNOTATION_COUNT", "1"))
    
    # Stage 19: Debug visualization
    DEBUG_VISUALIZATION_ENABLED: bool = os.getenv("DEBUG_VISUALIZATION_ENABLED", "false").lower() == "true"
    DEBUG_SHOW_TEXT_IN_BBOX: bool = os.getenv("DEBUG_SHOW_TEXT_IN_BBOX", "true").lower() == "true"
    DEBUG_BBOX_COLOR_RGB: str = os.getenv("DEBUG_BBOX_COLOR_RGB", "255,0,0")  # Red default
    
    # Dataset export
    DATASET_EXPORT_ENABLED: bool = os.getenv("DATASET_EXPORT_ENABLED", "false").lower() == "true"
    DATASET_EXPORT_FORMAT: str = os.getenv("DATASET_EXPORT_FORMAT", "msgpack")  # msgpack, coco, huggingface
    DATASET_EXPORT_DIR: str = os.getenv("DATASET_EXPORT_DIR", "/tmp/docgenie_datasets")
    DATASET_RESIZE_IMAGES: bool = os.getenv("DATASET_RESIZE_IMAGES", "false").lower() == "true"
    DATASET_CLIP_BBOXES_TO_FOREGROUND: bool = os.getenv("DATASET_CLIP_BBOXES_TO_FOREGROUND", "false").lower() == "true"
    
    # ==================== API Server Configuration ====================
    API_HOST: str = os.getenv("API_HOST", "0.0.0.0")
    API_PORT: int = int(os.getenv("API_PORT", "8000"))
    DEBUG_MODE: bool = os.getenv("DEBUG_MODE", "false").lower() == "true"
    
    # ==================== CORS Configuration ====================
    CORS_ORIGINS: List[str] = [
        origin.strip() 
        for origin in os.getenv("CORS_ORIGINS", "*").split(",")
        if origin.strip()
    ] or ["*"]
    
    # ==================== File Storage ====================
    TEMP_DIR: str = os.getenv("TEMP_DIR", "/tmp/docgenie_api")
    
    # ==================== Logging ====================
    LOG_LEVEL: str = os.getenv("LOG_LEVEL", "INFO")
    
    # ==================== Database (Optional) ====================
    DATABASE_URL: Optional[str] = os.getenv("DATABASE_URL", None)
    REDIS_URL: Optional[str] = os.getenv("REDIS_URL", "redis://localhost:6379/0")
    
    # ==================== Supabase ====================
    SUPABASE_URL: str = os.getenv("SUPABASE_URL", "")
    SUPABASE_KEY: str = os.getenv("SUPABASE_KEY", "")
    
    # ==================== Background Jobs ====================
    RQ_QUEUE_NAME: str = os.getenv("RQ_QUEUE_NAME", "docgenie")
    BATCH_POLL_INTERVAL: int = int(os.getenv("BATCH_POLL_INTERVAL", "30"))  # seconds
    BATCH_PROMPT_CHUNK_SIZE: int = int(os.getenv("BATCH_PROMPT_CHUNK_SIZE", "4"))  # documents per prompt
    BATCH_DATA_DIR: str = os.getenv("BATCH_DATA_DIR", "/tmp/docgenie_batches")
    MESSAGE_DATA_DIR: str = os.getenv("MESSAGE_DATA_DIR", "/tmp/docgenie_messages")
    
    # ==================== Google Drive ====================
    GOOGLE_DRIVE_FOLDER_NAME: str = os.getenv("GOOGLE_DRIVE_FOLDER_NAME", "DocGenie Documents")
    GOOGLE_CLIENT_ID: Optional[str] = os.getenv("GOOGLE_CLIENT_ID", None)  # For token refresh only
    GOOGLE_CLIENT_SECRET: Optional[str] = os.getenv("GOOGLE_CLIENT_SECRET", None)  # For token refresh only
    
    # ==================== Monitoring ====================
    SENTRY_DSN: Optional[str] = os.getenv("SENTRY_DSN", None)
    ENABLE_METRICS: bool = os.getenv("ENABLE_METRICS", "false").lower() == "true"
    METRICS_PORT: int = int(os.getenv("METRICS_PORT", "9090"))
    
    # ==================== AWS (Optional) ====================
    AWS_ACCESS_KEY_ID: Optional[str] = os.getenv("AWS_ACCESS_KEY_ID", None)
    AWS_SECRET_ACCESS_KEY: Optional[str] = os.getenv("AWS_SECRET_ACCESS_KEY", None)
    AWS_REGION: str = os.getenv("AWS_REGION", "us-east-1")
    S3_BUCKET: Optional[str] = os.getenv("S3_BUCKET", None)
    
    @classmethod
    def validate(cls) -> bool:
        """Validate required settings"""
        if not cls.ANTHROPIC_API_KEY:
            raise ValueError("ANTHROPIC_API_KEY environment variable is required")
        return True
    
    @classmethod
    def get_cors_origins(cls) -> List[str]:
        """Get CORS origins list"""
        return cls.CORS_ORIGINS if cls.CORS_ORIGINS != ["*"] else ["*"]


settings = Settings()