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//! Error declaration.
use actix_web::http::StatusCode;
use actix_web::{HttpResponse, ResponseError};
use derive_more::Display;

#[derive(Display, Debug)]
pub enum Error {
    #[display(fmt = "Validation error: {}", _0)]
    Validate(validator::ValidationErrors),
    #[display(fmt = "{}", _0)]
    Deserialize(DeserializeErrors),
    #[display(fmt = "Payload error: {}", _0)]
    JsonPayloadError(actix_web::error::JsonPayloadError),
    #[display(fmt = "Query error: {}", _0)]
    QsError(serde_qs::Error),
}

#[derive(Display, Debug)]
pub enum DeserializeErrors {
    #[display(fmt = "Query deserialize error: {}", _0)]
    DeserializeQuery(serde_urlencoded::de::Error),
    #[display(fmt = "Json deserialize error: {}", _0)]
    DeserializeJson(serde_json::error::Error),
    #[display(fmt = "Path deserialize error: {}", _0)]
    DeserializePath(serde::de::value::Error),
}

impl From<serde_json::error::Error> for Error {
    fn from(error: serde_json::error::Error) -> Self {
        Error::Deserialize(DeserializeErrors::DeserializeJson(error))
    }
}

impl From<serde_qs::Error> for Error {
    fn from(error: serde_qs::Error) -> Self {
        Error::QsError(error)
    }
}

impl From<serde_urlencoded::de::Error> for Error {
    fn from(error: serde_urlencoded::de::Error) -> Self {
        Error::Deserialize(DeserializeErrors::DeserializeQuery(error))
    }
}

impl From<actix_web::error::JsonPayloadError> for Error {
    fn from(error: actix_web::error::JsonPayloadError) -> Self {
        Error::JsonPayloadError(error)
    }
}

impl From<validator::ValidationErrors> for Error {
    fn from(error: validator::ValidationErrors) -> Self {
        Error::Validate(error)
    }
}

impl ResponseError for Error {
    fn error_response(&self) -> HttpResponse {
        HttpResponse::build(StatusCode::BAD_REQUEST).body(match self {
            Self::Validate(e) => format!(
                "Validation errors in fields:\n{}",
                e.field_errors()
                    .iter()
                    .map(|(field, err)| {
                        let error = err.first().map(|err| format!("{}", err.code));
                        format!("\t{}: {}", field, error.unwrap_or_default())
                    })
                    .collect::<Vec<_>>()
                    .join("\n")
            ),
            _ => format!("{}", *self),
        })
    }
}