import Foundation
import XCTest

@testable import CallsKit

/// The display kept awake through a call (0.4.10): begun once on joining,
/// ended once on leaving or the call ending, never held twice.
@MainActor final class CallWakeTests: XCTestCase {
  final class Recorder: CallWake.Activities {
    var begun: [String] = []
    var ended = 0
    var live = 0
    func begin(reason: String) -> NSObjectProtocol {
      begun.append(reason)
      live += 1
      return NSObject()
    }
    func end(_ activity: NSObjectProtocol) {
      ended += 1
      live -= 1
    }
  }

  func testHeldFromJoiningUntilLeaving() {
    let recorder = Recorder()
    let wake = CallWake(activities: recorder)
    XCTAssertFalse(wake.holding)
    wake.update(inCall: true)
    wake.update(inCall: true)
    XCTAssertTrue(wake.holding)
    XCTAssertEqual(recorder.begun, [CallWake.reason], "once, however often it is told")
    wake.update(inCall: false)
    wake.update(inCall: false)
    XCTAssertFalse(wake.holding)
    XCTAssertEqual(recorder.ended, 1)
    XCTAssertEqual(recorder.live, 0)
  }

  func testAnEndedCallLetsTheDisplaySleep() {
    XCTAssertTrue(CallWake.inCall(joining: true, phase: "admitted"))
    XCTAssertTrue(CallWake.inCall(joining: true, phase: nil), "joining, before the room has answered")
    XCTAssertTrue(CallWake.inCall(joining: true, phase: "reconnecting"))
    XCTAssertFalse(CallWake.inCall(joining: true, phase: "ended"))
    XCTAssertFalse(CallWake.inCall(joining: false, phase: "admitted"))
  }

  func testRejoiningHoldsItAgain() {
    let recorder = Recorder()
    let wake = CallWake(activities: recorder)
    for _ in 0..<3 {
      wake.update(inCall: true)
      wake.update(inCall: false)
    }
    XCTAssertEqual(recorder.begun.count, 3)
    XCTAssertEqual(recorder.ended, 3)
    XCTAssertEqual(recorder.live, 0)
  }

  #if os(macOS)
    func testTheModelHoldsItWhileJoiningOnly() {
      let model = CallsModel(store: MemorySessionStore(), remote: .bridge, defaults: UserDefaults(suiteName: "wake-\(UUID())")!)
      XCTAssertFalse(model.wake.holding)
      model.joining = true
      XCTAssertTrue(model.wake.holding)
      model.joining = false
      XCTAssertFalse(model.wake.holding)
    }
  #endif

  func testTheRealActivityBeginsAndEnds() {
    let wake = CallWake()
    wake.update(inCall: true)
    XCTAssertTrue(wake.holding)
    wake.update(inCall: false)
    XCTAssertFalse(wake.holding)
  }
}