use std::error::Error;
use std::fmt;

use meilisearch_error::{Code, ErrorCode};
use milli::UserError;

macro_rules! internal_error {
    ($target:ty : $($other:path), *) => {
        $(
            impl From<$other> for $target {
                fn from(other: $other) -> Self {
                    Self::Internal(Box::new(other))
                }
            }
        )*
    }
}

#[derive(Debug)]
pub struct MilliError<'a>(pub &'a milli::Error);

impl Error for MilliError<'_> {}

impl fmt::Display for MilliError<'_> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        self.0.fmt(f)
    }
}

impl ErrorCode for MilliError<'_> {
    fn error_code(&self) -> Code {
        match self.0 {
            milli::Error::InternalError(_) => Code::Internal,
            milli::Error::IoError(_) => Code::Internal,
            milli::Error::UserError(ref error) => {
                match error {
                    // TODO: wait for spec for new error codes.
                    UserError::SerdeJson(_)
                    | UserError::MaxDatabaseSizeReached
                    | UserError::InvalidDocumentId { .. }
                    | UserError::InvalidStoreFile
                    | UserError::NoSpaceLeftOnDevice
                    | UserError::DocumentLimitReached => Code::Internal,
                    UserError::AttributeLimitReached => Code::MaxFieldsLimitExceeded,
                    UserError::InvalidFilter(_) => Code::Filter,
                    UserError::InvalidFilterAttribute(_) => Code::Filter,
                    UserError::InvalidSortName { .. } => Code::Sort,
                    UserError::MissingDocumentId { .. } => Code::MissingDocumentId,
                    UserError::MissingPrimaryKey => Code::MissingPrimaryKey,
                    UserError::PrimaryKeyCannotBeChanged => Code::PrimaryKeyAlreadyPresent,
                    UserError::PrimaryKeyCannotBeReset => Code::PrimaryKeyAlreadyPresent,
                    UserError::SortRankingRuleMissing => Code::Sort,
                    UserError::UnknownInternalDocumentId { .. } => Code::DocumentNotFound,
                    UserError::InvalidFacetsDistribution { .. } => Code::BadRequest,
                    UserError::InvalidSortableAttribute { .. }
                    | UserError::InvalidReservedSortName { .. } => Code::Sort,
                    UserError::CriterionError(_) => Code::InvalidRankingRule,
                    UserError::InvalidGeoField { .. } => Code::InvalidGeoField,
                }
            }
        }
    }
}