use failure::Fail;

#[derive(Debug, Fail)]
pub enum ContextualError {
    /// Fully customized errors, not inheriting from any error
    #[fail(display = "{}", _0)]
    CustomError(String),

    /// Any kind of IO errors
    #[fail(display = "{}\ncaused by: {}", _0, _1)]
    IOError(String, std::io::Error),

    /// MultipartError, which might occur during file upload, when processing the multipart request fails
    #[fail(display = "Failed to process multipart request\ncaused by: {}", _0)]
    MultipartError(actix_web::error::MultipartError),

    /// This error might occur when decoding the HTTP authentication header.
    #[fail(
        display = "Failed to decode HTTP authentication header\ncaused by: {}",
        _0
    )]
    Base64DecodeError(base64::DecodeError),

    /// Any error related to an invalid path (failed to retrieve entry name, unexpected entry type, etc)
    #[fail(display = "Invalid path\ncaused by: {}", _0)]
    InvalidPathError(String),

    /// This error might occur if the HTTP credential string does not respect the expected format
    #[fail(
        display = "Invalid format for credentials string. Expected username:password, username:sha256:hash or username:sha512:hash"
    )]
    InvalidAuthFormat,

    /// This error might occure if the hash method is neither sha256 nor sha512
    #[fail(display = "{} is not a valid hashing method. Expected sha256 or sha512", _0)]
    InvalidHashMethod(String),

    /// This error might occur if the HTTP auth hash password is not a valid hex code
    #[fail(display = "Invalid format for password hash. Expected hex code")]
    InvalidPasswordHash,

    /// This error might occur if the HTTP auth password exceeds 255 characters
    #[fail(display = "HTTP password length exceeds 255 characters")]
    PasswordTooLongError,

    /// This error might occur if the user has unsufficient permissions to create an entry in a given directory
    #[fail(display = "Insufficient permissions to create file in {}", _0)]
    InsufficientPermissionsError(String),

    /// Any error related to parsing.
    #[fail(display = "Failed to parse {}\ncaused by: {}", _0, _1)]
    ParseError(String, String),

    /// This error might occur when the creation of an archive fails
    #[fail(
        display = "An error occured while creating the {}\ncaused by: {}",
        _0, _1
    )]
    ArchiveCreationError(String, Box<ContextualError>),

    /// This error might occur when the HTTP authentication fails
    #[fail(
        display = "An error occured during HTTP authentication\ncaused by: {}",
        _0
    )]
    HTTPAuthenticationError(Box<ContextualError>),
}

pub fn log_error_chain(description: String) {
    for cause in description.lines() {
        log::error!("{}", cause);
    }
}

/// This makes creating CustomErrors easier
impl From<String> for ContextualError {
    fn from(msg: String) -> ContextualError {
        ContextualError::CustomError(msg)
    }
}