import Testing
@testable import SstCore

struct AudioLevelTests {
    @Test func constantTenthIsMinusTwentyDbfs() {
        let level = AudioLevel.rmsDbfs([Float](repeating: 0.1, count: 1_000))
        #expect(abs(level - (-20)) < 0.01)
    }

    @Test func fullScaleIsZeroDbfs() {
        let level = AudioLevel.rmsDbfs([Float](repeating: 1.0, count: 100))
        #expect(abs(level) < 0.01)
    }

    @Test func negativeSamplesCountLikePositiveOnes() {
        let level = AudioLevel.rmsDbfs([Float](repeating: -0.1, count: 1_000))
        #expect(abs(level - (-20)) < 0.01)
    }

    @Test func emptyAndSilentBuffersHitTheFloor() {
        #expect(AudioLevel.rmsDbfs([]) == AudioLevel.silenceFloorDbfs)
        #expect(AudioLevel.rmsDbfs([Float](repeating: 0, count: 64)) == AudioLevel.silenceFloorDbfs)
    }

    @Test func vuIsRelativeToTheReference() {
        #expect(AudioLevel.vu(fromDbfs: -20) == 0)
        #expect(AudioLevel.vu(fromDbfs: -40) == -20)
        #expect(AudioLevel.vu(fromDbfs: -17) == 3)
        #expect(AudioLevel.vu(fromDbfs: -30, referenceDbfs: -18) == -12)
    }
}