// Copyright (C) 2024 Rubén Beltrán del Río

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

import Foundation
// You should have received a copy of the GNU General Public License
// along with this program. If not, see https://map.tranquil.systems.
import Testing

@testable import Map

struct DebouncerTests {

  @Test func testDebouncerExecutesAfterDelay() async throws {
    let debouncer = Debouncer(seconds: 0.1)
    var executed = false

    debouncer.debounce {
      executed = true
    }

    #expect(executed == false)

    try await Task.sleep(nanoseconds: 150_000_000)  // 0.15 seconds

    #expect(executed == true)
  }

  @Test func testDebouncerCancelsReplacement() async throws {
    let debouncer = Debouncer(seconds: 0.1)
    var firstExecuted = false
    var secondExecuted = false

    debouncer.debounce {
      firstExecuted = true
    }

    debouncer.debounce {
      secondExecuted = true
    }

    try await Task.sleep(nanoseconds: 150_000_000)  // 0.15 seconds

    #expect(firstExecuted == false)
    #expect(secondExecuted == true)
  }

  @Test func testDebouncerMultipleReplacements() async throws {
    let debouncer = Debouncer(seconds: 0.1)
    var counter = 0

    for i in 1...5 {
      debouncer.debounce {
        counter += i
      }
    }

    try await Task.sleep(nanoseconds: 150_000_000)  // 0.15 seconds

    #expect(counter == 5)
  }

}