use std::fmt;

pub use export::is_unique_violation;

#[derive(Debug)]
pub enum ChatError {
    BadRequest(String),
    Unauthorized,
    Forbidden,
    NotFound,
    Conflict(String),
    RateLimited(String),
    Internal(String),
}

impl fmt::Display for ChatError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::BadRequest(message) => write!(f, "{message}"),
            Self::Unauthorized => write!(f, "unauthorized"),
            Self::Forbidden => write!(f, "forbidden"),
            Self::NotFound => write!(f, "not found"),
            Self::Conflict(message) => write!(f, "{message}"),
            Self::RateLimited(message) => write!(f, "{message}"),
            Self::Internal(message) => write!(f, "{message}"),
        }
    }
}

impl std::error::Error for ChatError {}

export::db_error_conversions!(ChatError);
export::storage_error_conversion!(ChatError);
export::redis_error_conversion!(ChatError);
export::export_error_conversion!(ChatError);
export::json_payload_conversion!(ChatError);
export::access_error_conversion!(ChatError, BadRequest);

impl From<dir::Error> for ChatError {
    fn from(error: dir::Error) -> Self {
        match error {
            dir::Error::InvalidInput(message) => Self::BadRequest(message),
            dir::Error::NotFound => Self::NotFound,
            dir::Error::Database(error) => Self::from(error),
        }
    }
}

export::api_error! {
    log: "chat",
    pub enum ApiError {
        BadRequest(400, "request failed validation"),
        Unauthorized(401, "authentication required"),
        Forbidden(403, "operation not allowed"),
        NotFound(404, "resource not found"),
        Conflict(409, "resource conflict"),
        TooManyRequests(429, "rate limit exceeded"),
        Internal(500, "internal server error"),
    }
}

impl From<ChatError> for ApiError {
    fn from(error: ChatError) -> Self {
        match error {
            ChatError::BadRequest(msg) => Self::bad_request(msg),
            ChatError::Unauthorized => Self::unauthorized(),
            ChatError::Forbidden => Self::forbidden(),
            ChatError::NotFound => Self::not_found("chat resource not found"),
            ChatError::Conflict(msg) => Self::conflict(msg),
            ChatError::RateLimited(msg) => Self::rate_limited(msg),
            ChatError::Internal(message) => Self::internal(message),
        }
    }
}