import XCTest
@testable import RSSuper

/// Unit tests for SyncScheduler
final class SyncSchedulerTests: XCTestCase {
    
    private var scheduler: SyncScheduler!
    
    override func setUp() {
        super.setUp()
        scheduler = SyncScheduler()
    }
    
    override func tearDown() {
        scheduler = nil
        super.tearDown()
    }
    
    func testDefaultSyncInterval() {
        XCTAssertEqual(scheduler.preferredSyncInterval, SyncScheduler.defaultSyncInterval)
    }
    
    func testSyncIntervalClamping() {
        // Test minimum clamping
        scheduler.preferredSyncInterval = 60 // 1 minute
        XCTAssertEqual(scheduler.preferredSyncInterval, SyncScheduler.minimumSyncInterval)
        
        // Test maximum clamping
        scheduler.preferredSyncInterval = 48 * 3600 // 48 hours
        XCTAssertEqual(scheduler.preferredSyncInterval, SyncScheduler.maximumSyncInterval)
    }
    
    func testIsSyncDue() {
        // Fresh scheduler should have sync due
        XCTAssertTrue(scheduler.isSyncDue)
        
        // Set last sync date to recent past
        scheduler.lastSyncDate = Date().addingTimeInterval(-1 * 3600) // 1 hour ago
        XCTAssertFalse(scheduler.isSyncDue)
        
        // Set last sync date to far past
        scheduler.lastSyncDate = Date().addingTimeInterval(-12 * 3600) // 12 hours ago
        XCTAssertTrue(scheduler.isSyncDue)
    }
    
    func testTimeSinceLastSync() {
        scheduler.lastSyncDate = Date().addingTimeInterval(-3600) // 1 hour ago
        
        let timeSince = scheduler.timeSinceLastSync
        XCTAssertGreaterThan(timeSince, 3500)
        XCTAssertLessThan(timeSince, 3700)
    }
    
    func testResetSyncSchedule() {
        scheduler.preferredSyncInterval = 12 * 3600
        scheduler.lastSyncDate = Date().addingTimeInterval(-100)
        
        scheduler.resetSyncSchedule()
        
        XCTAssertEqual(scheduler.preferredSyncInterval, SyncScheduler.defaultSyncInterval)
        XCTAssertNil(scheduler.lastSyncDate)
    }
    
    func testUserActivityLevelCalculation() {
        // High activity
        XCTAssertEqual(UserActivityLevel.calculate(from: 5, lastOpenedAgo: 3600), .high)
        XCTAssertEqual(UserActivityLevel.calculate(from: 1, lastOpenedAgo: 60), .high)
        
        // Medium activity
        XCTAssertEqual(UserActivityLevel.calculate(from: 2, lastOpenedAgo: 3600), .medium)
        XCTAssertEqual(UserActivityLevel.calculate(from: 0, lastOpenedAgo: 43200), .medium)
        
        // Low activity
        XCTAssertEqual(UserActivityLevel.calculate(from: 0, lastOpenedAgo: 172800), .low)
    }
}