import XCTest
@testable import IDPGlobal

final class OneTimePasscodeGeneratorTests: XCTestCase {
    func testCodeStaysStableWithinWindow() {
        let firstDate = Date(timeIntervalSince1970: 60)
        let secondDate = Date(timeIntervalSince1970: 89)
        let nextWindowDate = Date(timeIntervalSince1970: 90)

        let firstCode = OneTimePasscodeGenerator.code(for: "pairing-payload", at: firstDate)
        let secondCode = OneTimePasscodeGenerator.code(for: "pairing-payload", at: secondDate)
        let nextWindowCode = OneTimePasscodeGenerator.code(for: "pairing-payload", at: nextWindowDate)

        XCTAssertEqual(firstCode, secondCode)
        XCTAssertNotEqual(firstCode, nextWindowCode)
    }

    func testRenewalCountdownResetsAtBoundary() {
        XCTAssertEqual(OneTimePasscodeGenerator.renewalCountdown(at: Date(timeIntervalSince1970: 90)), 30)
        XCTAssertEqual(OneTimePasscodeGenerator.renewalCountdown(at: Date(timeIntervalSince1970: 119)), 1)
        XCTAssertEqual(OneTimePasscodeGenerator.renewalCountdown(at: Date(timeIntervalSince1970: 120)), 30)
    }
}