use std::fmt;

use meilisearch_error::{Code, ErrorCode};
use tokio::sync::mpsc::error::SendError as MpscSendError;
use tokio::sync::oneshot::error::RecvError as OneshotRecvError;

use crate::{error::MilliError, index::error::IndexError};

pub type Result<T> = std::result::Result<T, IndexResolverError>;

#[derive(thiserror::Error, Debug)]
pub enum IndexResolverError {
    #[error("{0}")]
    IndexError(#[from] IndexError),
    #[error("Index already exists")]
    IndexAlreadyExists,
    #[error("Index {0} not found")]
    UnexistingIndex(String),
    #[error("A primary key is already present. It's impossible to update it")]
    ExistingPrimaryKey,
    #[error("Internal Error: {0}")]
    Internal(Box<dyn std::error::Error + Send + Sync + 'static>),
    #[error("{0}")]
    Milli(#[from] milli::Error),
    #[error("Index must have a valid uid; Index uid can be of type integer or string only composed of alphanumeric characters, hyphens (-) and underscores (_).")]
    BadlyFormatted(String),
}

impl<T> From<MpscSendError<T>> for IndexResolverError
where T: Send + Sync + 'static + fmt::Debug
{
    fn from(other: tokio::sync::mpsc::error::SendError<T>) -> Self {
        Self::Internal(Box::new(other))
    }
}

impl From<OneshotRecvError> for IndexResolverError {
    fn from(other: tokio::sync::oneshot::error::RecvError) -> Self {
        Self::Internal(Box::new(other))
    }
}

internal_error!(
    IndexResolverError: heed::Error,
    uuid::Error,
    std::io::Error,
    tokio::task::JoinError,
    serde_json::Error
);

impl ErrorCode for IndexResolverError {
    fn error_code(&self) -> Code {
        match self {
            IndexResolverError::IndexError(e) => e.error_code(),
            IndexResolverError::IndexAlreadyExists => Code::IndexAlreadyExists,
            IndexResolverError::UnexistingIndex(_) => Code::IndexNotFound,
            IndexResolverError::ExistingPrimaryKey => Code::PrimaryKeyAlreadyPresent,
            IndexResolverError::Internal(_) => Code::Internal,
            IndexResolverError::Milli(e) => MilliError(e).error_code(),
            IndexResolverError::BadlyFormatted(_) => Code::InvalidIndexUid,
        }
    }
}