import Domain
import Foundation
@testable import Playback
import Testing

struct SampleRateMatcherTests {
    private let device = OutputDeviceInfo(id: 1, name: "Fake", nominalRate: 48000, availableRates: [44100, 48000, 96000])
    private let flac = AudioFormat(codec: .flac, sampleRate: 44100, bitDepth: 16)

    @Test func settingOffLeavesDeviceAlone() {
        #expect(SampleRateMatcher(isEnabled: false).targetRate(for: flac, on: device) == nil)
    }

    @Test func sameRateNeedsNoSwitch() {
        let format = AudioFormat(codec: .flac, sampleRate: 48000)
        #expect(SampleRateMatcher(isEnabled: true).targetRate(for: format, on: device) == nil)
    }

    @Test func unavailableRateIsIgnored() {
        let format = AudioFormat(codec: .flac, sampleRate: 192_000)
        #expect(SampleRateMatcher(isEnabled: true).targetRate(for: format, on: device) == nil)
    }

    @Test func unknownRateOrDeviceIsIgnored() {
        let matcher = SampleRateMatcher(isEnabled: true)
        #expect(matcher.targetRate(for: AudioFormat(codec: .mp3), on: device) == nil)
        #expect(matcher.targetRate(for: nil, on: device) == nil)
        #expect(matcher.targetRate(for: flac, on: nil) == nil)
    }

    @Test func availableRateIsChosenExactly() {
        #expect(SampleRateMatcher(isEnabled: true).targetRate(for: flac, on: device) == 44100)
    }
}