use actix_web::http::StatusCode;
use actix_web::ResponseError;
use api::data_type::DataType;
use thiserror::Error;

#[derive(Error, Debug)]
pub enum Error {
    #[error("Command Not Found {0}")]
    CommandNotFound(String),
    #[error("Incorrect Number of Parameters Specified. {expected} expected. {actual} found.")]
    IncorrectParameterCount { expected: usize, actual: usize },
    #[error("Missing Parameter {0}.")]
    MisingParameter(String),
    #[error("Incorrect Parameter Type for {name}. {expected_type:?} expected.")]
    WrongParameterType {
        name: String,
        expected_type: DataType,
    },
    #[error("No Command Receiver")]
    NoCommandReceiver,
    #[error("Failed to Send")]
    FailedToSend,
    #[error("Failed to Receive Command Response")]
    FailedToReceiveResponse,
    #[error("Command Failure: {0}")]
    CommandFailure(String),
}

impl ResponseError for Error {
    fn status_code(&self) -> StatusCode {
        match *self {
            Error::CommandNotFound(_) => StatusCode::NOT_FOUND,
            Error::IncorrectParameterCount { .. } => StatusCode::BAD_REQUEST,
            Error::MisingParameter(_) => StatusCode::BAD_REQUEST,
            Error::WrongParameterType { .. } => StatusCode::BAD_REQUEST,
            Error::NoCommandReceiver => StatusCode::SERVICE_UNAVAILABLE,
            Error::FailedToSend => StatusCode::INTERNAL_SERVER_ERROR,
            Error::FailedToReceiveResponse => StatusCode::INTERNAL_SERVER_ERROR,
            Error::CommandFailure(_) => StatusCode::BAD_REQUEST,
        }
    }
}