// 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 https://mozilla.org/MPL/2.0/.

use crate::metrics::DistributionData;
use crate::{ErrorType, TestGetValue};

/// A description for the
/// [`MemoryDistributionMetric`](crate::metrics::MemoryDistributionMetric) type.
///
/// When changing this trait, make sure all the operations are
/// implemented in the related type in `../metrics/`.
pub trait MemoryDistribution: TestGetValue<Output = DistributionData> {
    /// Accumulates the provided sample in the metric.
    ///
    /// # Arguments
    ///
    /// * `sample` - The sample to be recorded by the metric. The sample is assumed to be in the
    ///   configured memory unit of the metric.
    ///
    /// ## Notes
    ///
    /// Values bigger than 1 Terabyte (2<sup>40</sup> bytes) are truncated
    /// and an `ErrorType::InvalidValue` error is recorded.
    fn accumulate(&self, sample: u64);

    /// Accumulates the provided signed samples in the metric.
    ///
    /// This is required so that the platform-specific code can provide us with
    /// 64 bit signed integers if no `u64` comparable type is available. This
    /// will take care of filtering and reporting errors for any provided negative
    /// sample.
    ///
    /// Please note that this assumes that the provided samples are already in
    /// the "unit" declared by the instance of the metric type (e.g. if the the
    /// instance this method was called on is using [`crate::MemoryUnit::Kilobyte`], then
    /// `samples` are assumed to be in that unit).
    ///
    /// # Arguments
    ///
    /// * `samples` - The vector holding the samples to be recorded by the metric.
    ///
    /// ## Notes
    ///
    /// Discards any negative value in `samples` and report an [`ErrorType::InvalidValue`]
    /// for each of them.
    ///
    /// Values bigger than 1 Terabyte (2<sup>40</sup> bytes) are truncated
    /// and an [`ErrorType::InvalidValue`] error is recorded.
    fn accumulate_samples(&self, samples: Vec<i64>);

    /// **Exported for test purposes.**
    ///
    /// Gets the number of recorded errors for the given error type.
    ///
    /// # Arguments
    ///
    /// * `error` - The type of error
    ///
    /// # Returns
    ///
    /// The number of errors recorded.
    fn test_get_num_recorded_errors(&self, error: ErrorType) -> i32;
}
