import os
import json
from pydantic import field_validator, model_validator
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    mongodb_uri: str = "mongodb://localhost:27017"
    database_name: str = "chatbot_db"
    allowed_origins: list[str] | str = [
        "http://localhost:3000",
        "http://localhost:8000",
        "http://127.0.0.1:5500",
        "http://127.0.0.1:8000",
    ]
    jwt_secret: str = ""
    jwt_algorithm: str = "HS256"
    jwt_expiration_minutes: int = 1440
    
    # Email / SMTP Configuration
    smtp_host: str = ""
    smtp_port: int = 587
    smtp_user: str = ""
    smtp_password: str = ""
    smtp_from_email: str = "noreply@outrightcrm.in"
    smtp_use_tls: bool = True
    smtp_use_ssl: bool = False
    admin_notification_email: str = "alok.chaudhary2001@gmail.com"

    @field_validator("allowed_origins", mode="after")
    @classmethod
    def parse_allowed_origins(cls, v: list[str] | str) -> list[str]:
        if isinstance(v, str):
            v = v.strip()
            if v.startswith("[") and v.endswith("]"):
                try:
                    import json
                    parsed = json.loads(v)
                    if isinstance(parsed, list):
                        return parsed
                except json.JSONDecodeError:
                    pass
            return [origin.strip() for origin in v.split(",") if origin.strip()]
        return v

    @model_validator(mode="after")
    def validate_jwt_secret(self) -> "Settings":
        if not self.jwt_secret:
            if "PYTEST_CURRENT_TEST" in os.environ or os.environ.get("ENV") == "test":
                self.jwt_secret = "test_deterministic_jwt_secret_for_pytest"
            else:
                raise ValueError("JWT_SECRET environment variable is missing or empty. Please set JWT_SECRET in .env or environment variables.")
        return self

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


settings = Settings()