"""Application configuration."""

from functools import lru_cache
from typing import Any

from pydantic import PostgresDsn, field_validator
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    """Application settings."""

    model_config = SettingsConfigDict(
        env_file=".env",
        env_file_encoding="utf-8",
        case_sensitive=False,
        extra="ignore",
    )

    # Application
    APP_NAME: str = "Reference Board Viewer"
    APP_VERSION: str = "1.0.0"
    DEBUG: bool = False
    API_V1_PREFIX: str = "/api/v1"

    # Database
    DATABASE_URL: PostgresDsn
    DATABASE_POOL_SIZE: int = 20
    DATABASE_MAX_OVERFLOW: int = 0

    # JWT Authentication
    SECRET_KEY: str
    ALGORITHM: str = "HS256"
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30

    # MinIO Storage
    MINIO_ENDPOINT: str
    MINIO_ACCESS_KEY: str
    MINIO_SECRET_KEY: str
    MINIO_BUCKET: str = "webref"
    MINIO_SECURE: bool = False

    # CORS
    CORS_ORIGINS: list[str] = ["http://localhost:5173", "http://localhost:3000"]

    @field_validator("CORS_ORIGINS", mode="before")
    @classmethod
    def parse_cors_origins(cls, v: Any) -> list[str]:
        """Parse CORS origins from string or list."""
        if isinstance(v, str):
            return [origin.strip() for origin in v.split(",")]
        return v

    # File Upload
    MAX_FILE_SIZE: int = 52428800  # 50MB
    MAX_BATCH_SIZE: int = 524288000  # 500MB
    ALLOWED_MIME_TYPES: list[str] = [
        "image/jpeg",
        "image/png",
        "image/gif",
        "image/webp",
        "image/svg+xml",
    ]

    @field_validator("ALLOWED_MIME_TYPES", mode="before")
    @classmethod
    def parse_mime_types(cls, v: Any) -> list[str]:
        """Parse MIME types from string or list."""
        if isinstance(v, str):
            return [mime.strip() for mime in v.split(",")]
        return v

    # Performance
    REQUEST_TIMEOUT: int = 30
    MAX_CONCURRENT_UPLOADS: int = 10

    # Security
    BCRYPT_ROUNDS: int = 12
    PASSWORD_MIN_LENGTH: int = 8

    # Logging
    LOG_LEVEL: str = "INFO"


@lru_cache
def get_settings() -> Settings:
    """Get cached application settings."""
    return Settings()


# Export settings instance
settings = get_settings()