/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/

use error_support::{ErrorHandling, GetErrorHandling};

/// Errors we return via the public interface.
#[derive(Debug, thiserror::Error, uniffi::Error)]
pub enum RelevancyApiError {
    #[error("Unexpected Error: {reason}")]
    Unexpected { reason: String },
}

/// Errors we use internally
#[derive(Debug, thiserror::Error)]
pub enum Error {
    #[error("Error opening database: {0}")]
    OpenDatabase(#[from] sql_support::open_database::Error),

    #[error("Sql error: {0}")]
    SqlError(#[from] rusqlite::Error),

    #[error("Error fetching interest data")]
    FetchInterestDataError,

    #[error("Interrupted")]
    Interrupted(#[from] interrupt_support::Interrupted),

    #[error("Invalid interest code: {0}")]
    InvalidInterestCode(u32),

    #[error("Remote Setting Error: {0}")]
    RemoteSettingsError(#[from] remote_settings::RemoteSettingsError),

    #[error("Error parsing {type_name}: {error} ({path})")]
    RemoteSettingsParseError {
        type_name: String,
        path: String,
        error: serde_json::Error,
    },

    #[error("Base64 Decode Error: {0}")]
    Base64DecodeError(String),

    #[error("Error retrieving bandit data for bandit {bandit} and arm {arm}")]
    BanditNotFound { bandit: String, arm: String },
}

/// Result enum for the public API
pub type ApiResult<T> = std::result::Result<T, RelevancyApiError>;

/// Result enum for internal functions
pub type Result<T> = std::result::Result<T, Error>;

// Define how our internal errors are handled and converted to external errors
// See `support/error/README.md` for how this works, especially the warning about PII.
impl GetErrorHandling for Error {
    type ExternalError = RelevancyApiError;

    fn get_error_handling(&self) -> ErrorHandling<Self::ExternalError> {
        match self {
            Self::RemoteSettingsParseError { .. } => {
                ErrorHandling::convert(RelevancyApiError::Unexpected {
                    reason: self.to_string(),
                })
                .report_error("relevancy-remote-settings-parse-error")
            }

            _ => ErrorHandling::convert(RelevancyApiError::Unexpected {
                reason: self.to_string(),
            }),
        }
    }
}