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

use meilisearch_types::error::{Code, ErrorCode};
use milli::UserError;

#[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::DocumentLimitReached
                    | UserError::UnknownInternalDocumentId { .. } => Code::Internal,
                    UserError::InvalidStoreFile => Code::InvalidStore,
                    UserError::NoSpaceLeftOnDevice => Code::NoSpaceLeftOnDevice,
                    UserError::MaxDatabaseSizeReached => Code::DatabaseSizeLimitReached,
                    UserError::AttributeLimitReached => Code::MaxFieldsLimitExceeded,
                    UserError::InvalidFilter(_) => Code::Filter,
                    UserError::MissingDocumentId { .. } => Code::MissingDocumentId,
                    UserError::InvalidDocumentId { .. } | UserError::TooManyDocumentIds { .. } => {
                        Code::InvalidDocumentId
                    }
                    UserError::MissingPrimaryKey => Code::MissingPrimaryKey,
                    UserError::PrimaryKeyCannotBeChanged(_) => Code::PrimaryKeyAlreadyPresent,
                    UserError::SortRankingRuleMissing => Code::Sort,
                    UserError::InvalidFacetsDistribution { .. } => Code::BadRequest,
                    UserError::InvalidSortableAttribute { .. } => Code::Sort,
                    UserError::CriterionError(_) => Code::InvalidRankingRule,
                    UserError::InvalidGeoField { .. } => Code::InvalidGeoField,
                    UserError::SortError(_) => Code::Sort,
                    UserError::InvalidMinTypoWordLenSetting(_, _) => {
                        Code::InvalidMinWordLengthForTypo
                    }
                }
            }
        }
    }
}