// Copyright 2026 International Digital Economy Academy
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

///|
type Timestamp

///|
/// Capture the current monotonic timestamp.
///
/// Use the returned timestamp with `monotonic_clock_end` to measure elapsed
/// time. A monotonic clock is not affected by system clock adjustments.
pub extern "js" fn monotonic_clock_start() -> Timestamp =
  #| () => performance.now()

///|
/// Compute elapsed time in microseconds since `ts`.
///
/// Parameters:
///
/// - `ts`: a timestamp created by `monotonic_clock_start`.
///
/// Returns elapsed time in microseconds.
pub extern "js" fn monotonic_clock_end(ts : Timestamp) -> Double =
  #| (ts) => (performance.now() - ts) * 1000.0