use std::fmt;

#[derive(Debug)]
pub enum Error {
    Request(reqwest::Error),
    InvalidApiKey,
    Api { code: String, status: String, detail: String },
    RateLimited { retry_after_secs: u64 },
    UnexpectedResponse(String),
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::Request(e) => write!(f, "request failed: {e}"),
            Self::InvalidApiKey => write!(f, "invalid api key"),
            Self::Api { code, status, detail } => {
                write!(f, "api error [{code}] ({status}): {detail}")
            }
            Self::RateLimited { retry_after_secs } => {
                write!(f, "rate limited, retry after {retry_after_secs}s")
            }
            Self::UnexpectedResponse(s) => write!(f, "unexpected response shape: {s}"),
        }
    }
}

impl std::error::Error for Error {
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        match self {
            Self::Request(e) => Some(e),
            _ => None,
        }
    }
}

impl From<reqwest::Error> for Error {
    fn from(e: reqwest::Error) -> Self {
        Self::Request(e)
    }
}