import Testing
@testable import Kordant
import SwiftUI
import OSLog

// MARK: - LaunchTimer Tests

struct LaunchTimerTests {
    @Test("LaunchTimer tracks elapsed time since process start")
    func elapsedSinceProcessStart() {
        let timer = LaunchTimer.shared
        let elapsed = timer.elapsedSinceProcessStart
        #expect(elapsed >= 0)
    }

    @Test("LaunchTimer measures phase start and end")
    func measurePhase() {
        let timer = LaunchTimer.shared
        let id = timer.startPhase("TestPhase")
        #expect(id >= 0)

        // Simulate some work
        try? Task.checkCancellation()

        timer.endPhase("TestPhase", signpostID: id)

        let report = timer.report()
        #expect(report["TestPhase_start"] != nil)
        #expect(report["TestPhase_end"] != nil)
        #expect(report["TestPhase_duration"] != nil)
        #expect(report["total"] != nil)
    }

    @Test("LaunchTimer logs events")
    func logEvent() {
        let timer = LaunchTimer.shared
        timer.logEvent("TestEvent", "test message")

        let report = timer.report()
        #expect(report["TestEvent"] != nil)
    }

    @Test("LaunchTimer report includes total time")
    func reportContainsTotal() {
        let timer = LaunchTimer.shared
        let report = timer.report()
        #expect(report["total"] != nil)
        #expect(report["total"]! >= 0)
    }
}

// MARK: - Launch Performance Tests

struct LaunchPerformanceTests {
    /// Measures AuthService initialization time (should be fast, < 10ms)
    @Test("AuthService init is fast (no blocking work)")
    @MainActor
    func authServiceInitTime() {
        let keychain = MockKeychainService()
        let apiClient = MockAuthAPIClient()

        let start = Date()
        let service = AuthService(keychain: keychain, apiClient: apiClient)
        let elapsed = -start.timeIntervalSinceNow

        // AuthService init should be nearly instantaneous since restoreSession is deferred
        #expect(elapsed < 0.01, "AuthService init took \(elapsed)s (expected < 10ms)")
    }

    /// Measures session restoration time
    @Test("AuthService restoreSession completes quickly")
    @MainActor
    func sessionRestoreTime() async {
        let keychain = MockKeychainService()
        let apiClient = MockAuthAPIClient()
        let service = AuthService(keychain: keychain, apiClient: apiClient)

        let start = Date()
        service.restoreSession()
        let elapsed = -start.timeIntervalSinceNow

        // Session restore involves keychain lookups, should be fast
        #expect(elapsed < 0.05, "Session restore took \(elapsed)s (expected < 50ms)")
    }

    /// Measures SecurityManager initialization (should be lightweight)
    @Test("SecurityManager init is fast")
    @MainActor
    func securityManagerInitTime() {
        let start = Date()
        _ = SecurityManager.shared
        let elapsed = -start.timeIntervalSinceNow

        // SecurityManager should be lazy, init should be instant
        #expect(elapsed < 0.01, "SecurityManager init took \(elapsed)s (expected < 10ms)")
    }

    /// Measures NetworkMonitor initialization (should be lazy)
    @Test("NetworkMonitor init is fast")
    func networkMonitorInitTime() {
        let start = Date()
        let monitor = NetworkMonitor()
        let elapsed = -start.timeIntervalSinceNow

        // NetworkMonitor should not start monitoring on init
        #expect(elapsed < 0.01, "NetworkMonitor init took \(elapsed)s (expected < 10ms)")
        monitor.stopMonitoring()
    }

    /// Measures ImageCacheService initialization (should be lazy)
    @Test("ImageCacheService shared init is fast")
    @MainActor
    func imageCacheServiceInitTime() {
        let start = Date()
        _ = ImageCacheService.shared
        let elapsed = -start.timeIntervalSinceNow

        // ImageCacheService should not load metadata on init
        #expect(elapsed < 0.05, "ImageCacheService init took \(elapsed)s (expected < 50ms)")
    }
}

// MARK: - Lazy Loading Verification Tests

struct LazyLoadingTests {
    @Test("AuthService does not restore session in init")
    @MainActor
    func authServiceNoRestoreOnInit() {
        let keychain = MockKeychainService()
        let apiClient = MockAuthAPIClient()

        // Store a token in keychain
        try? keychain.store(key: "jwt", value: Data("test-token".utf8))
        try? keychain.store(key: "currentUser", value: try! JSONEncoder().encode(
            User(id: "1", name: "Test", email: "test@test.com")
        ))

        let service = AuthService(keychain: keychain, apiClient: apiClient)

        // Session should NOT be restored in init
        #expect(service.state == .unauthenticated)
        #expect(service.currentUser == nil)

        // After explicit restore, state should update
        service.restoreSession()
        #expect(service.state == .authenticated)
    }

    @Test("NetworkMonitor does not start monitoring on init")
    func networkMonitorLazyStart() {
        let monitor = NetworkMonitor()
        // The monitor property should exist but monitoring should not have started
        // We can't directly check the private flag, but we verify the behavior
        // by checking that the default isConnected value hasn't changed
        #expect(monitor.isConnected == true) // Default value, not from actual monitoring
        monitor.stopMonitoring()
    }
}

// MARK: - Build Configuration Tests

struct BuildConfigTests {
    @Test("LaunchTimer is available in all configurations")
    func launchTimerAvailable() {
        let timer = LaunchTimer.shared
        #expect(timer != nil)
    }

    @Test("Build configuration is accessible")
    func buildConfig() {
        #expect(ProcessInfo.processInfo.operatingSystemVersionString.count > 0)
    }
}