from pydantic_settings import BaseSettings
from pydantic import field_validator
from typing import Optional


class Settings(BaseSettings):
    # Application
    APP_NAME: str = "Patherly"
    DEBUG: bool = False
    API_V1_PREFIX: str = "/api/v1"

    # Database - Railway provides DATABASE_URL, we convert it for asyncpg
    DATABASE_URL: str = "postgresql+asyncpg://postgres:postgres@localhost:5432/patherly"
    DATABASE_URL_SYNC: str = "postgresql://postgres:postgres@localhost:5432/patherly"

    @field_validator("DATABASE_URL", mode="before")
    @classmethod
    def convert_database_url(cls, v: str) -> str:
        """Convert standard postgres URL to asyncpg format."""
        if v.startswith("postgresql://"):
            return v.replace("postgresql://", "postgresql+asyncpg://", 1)
        return v

    @field_validator("DATABASE_URL_SYNC", mode="before")
    @classmethod
    def ensure_sync_url(cls, v: str) -> str:
        """Ensure sync URL uses standard postgresql prefix."""
        if v.startswith("postgresql+asyncpg://"):
            return v.replace("postgresql+asyncpg://", "postgresql://", 1)
        return v

    # JWT Settings
    SECRET_KEY: str = "your-secret-key-change-in-production-use-openssl-rand-hex-32"
    ALGORITHM: str = "HS256"
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 15
    REFRESH_TOKEN_EXPIRE_DAYS: int = 7

    # Security
    BCRYPT_ROUNDS: int = 12

    # CORS - set FRONTEND_URL in production (e.g., https://patherly.up.railway.app)
    CORS_ORIGINS: list[str] = ["http://localhost:3000", "http://localhost:5173", "http://localhost:5174"]
    FRONTEND_URL: Optional[str] = None

    @property
    def allowed_origins(self) -> list[str]:
        """Get all allowed CORS origins including FRONTEND_URL if set."""
        origins = self.CORS_ORIGINS.copy()
        if self.FRONTEND_URL and self.FRONTEND_URL not in origins:
            origins.append(self.FRONTEND_URL)
        return origins

    class Config:
        env_file = ".env"
        case_sensitive = True


settings = Settings()