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use query_core::CoreError;
use thiserror::Error;
use user_facing_errors::{KnownError, UnknownError};

#[derive(Debug, Error)]
#[allow(clippy::large_enum_variant)]
pub enum HandlerError {
    #[error("{}", _0)]
    Core(#[from] CoreError),

    #[error("{}", _0)]
    Configuration(String),

    #[error("{}", _0)]
    QueryConversion(String),

    #[error("Unsupported feature: {}. {}", feature_name, message)]
    UnsupportedFeature {
        feature_name: &'static str,
        message: String,
    },

    #[error("{}", _0)]
    ValueFitError(String),
}

impl HandlerError {
    pub fn configuration(message: impl ToString) -> Self {
        Self::Configuration(message.to_string())
    }

    pub fn query_conversion(message: impl ToString) -> Self {
        Self::Configuration(message.to_string())
    }

    pub fn unsupported_feature(feature_name: &'static str, message: impl ToString) -> Self {
        let message = message.to_string();

        Self::UnsupportedFeature { feature_name, message }
    }

    pub fn value_fit(details: impl ToString) -> Self {
        Self::ValueFitError(details.to_string())
    }
}

impl From<url::ParseError> for HandlerError {
    fn from(e: url::ParseError) -> Self {
        Self::configuration(format!("Error parsing connection string: {e}"))
    }
}

impl From<connection_string::Error> for HandlerError {
    fn from(e: connection_string::Error) -> Self {
        Self::configuration(format!("Error parsing connection string: {e}"))
    }
}

#[cfg(feature = "graphql-protocol")]
impl From<graphql_parser::query::ParseError> for HandlerError {
    fn from(e: graphql_parser::query::ParseError) -> Self {
        Self::configuration(format!("Error parsing GraphQL query: {e}"))
    }
}

impl From<HandlerError> for user_facing_errors::Error {
    fn from(err: HandlerError) -> Self {
        match err {
            HandlerError::Core(ce) => user_facing_errors::Error::from(ce),

            HandlerError::ValueFitError(details) => {
                KnownError::new(user_facing_errors::query_engine::ValueFitError { details }).into()
            }

            _ => UnknownError::new(&err).into(),
        }
    }
}

impl From<query_core::ConnectorError> for HandlerError {
    fn from(value: query_core::ConnectorError) -> Self {
        HandlerError::Core(value.into())
    }
}