import SwiftUI
import BackgroundTasks

extension Color {
    init(hex: String) {
        let hex = hex.trimmingCharacters(in: CharacterSet.alphanumerics.inverted)
        var int: UInt64 = 0
        Scanner(string: hex).scanHexInt64(&int)
        let a, r, g, b: UInt64
        switch hex.count {
        case 3: (a, r, g, b) = (255, (int >> 8) * 17, (int >> 4 & 0xF) * 17, (int & 0xF) * 17)
        case 6: (a, r, g, b) = (255, int >> 16, int >> 8 & 0xFF, int & 0xFF)
        case 8: (a, r, g, b) = (int >> 24, int >> 16 & 0xFF, int >> 8 & 0xFF, int & 0xFF)
        default: (a, r, g, b) = (255, 0, 0, 0)
        }
        self.init(.sRGB, red: Double(r)/255, green: Double(g)/255, blue: Double(b)/255, opacity: Double(a)/255)
    }
}

@main
struct PulseApp: App {
    @StateObject private var authManager = AuthManager()

    init() {
        BGTaskScheduler.shared.register(forTaskWithIdentifier: "com.daniil.pulsehealth.healthsync", using: nil) { task in
            Self.handleHealthSync(task: task as! BGProcessingTask)
        }
    }

    var body: some Scene {
        WindowGroup {
            Group {
                if authManager.isLoggedIn {
                    MainTabView()
                } else {
                    LoginView()
                }
            }
            .environmentObject(authManager)
            .onAppear {
                APIService.shared.authManager = authManager
                // Ensure health credentials are in Keychain
                if KeychainService.load(key: KeychainService.healthApiKeyKey) == nil {
                    KeychainService.save(key: KeychainService.healthApiKeyKey, value: "health-cosmo-2026")
                    HealthAPIService.configureCredentials(email: "daniilklimov25@gmail.com", password: "cosmo-health-2026")
                }
                authManager.healthApiKey = KeychainService.load(key: KeychainService.healthApiKeyKey) ?? ""
                Self.scheduleHealthSync()
            }
        }
    }

    static func scheduleHealthSync() {
        let request = BGProcessingTaskRequest(identifier: "com.daniil.pulsehealth.healthsync")
        request.earliestBeginDate = Date(timeIntervalSinceNow: 30 * 60) // 30 минут
        request.requiresNetworkConnectivity = true
        try? BGTaskScheduler.shared.submit(request)
    }

    static func handleHealthSync(task: BGProcessingTask) {
        // Запланировать следующий синк
        scheduleHealthSync()

        let syncTask = Task {
            let service = HealthKitService()
            let apiKey = KeychainService.load(key: KeychainService.healthApiKeyKey) ?? ""
            guard !apiKey.isEmpty else { return }
            try await service.syncToServer(apiKey: apiKey)
        }

        task.expirationHandler = { syncTask.cancel() }

        Task {
            do {
                try await syncTask.value
                task.setTaskCompleted(success: true)
            } catch {
                task.setTaskCompleted(success: false)
            }
        }
    }
}

class AuthManager: ObservableObject {
    @Published var isLoggedIn: Bool = false
    @Published var token: String = ""
    @Published var refreshToken: String = ""
    @Published var userName: String = ""
    @Published var userId: Int = 0
    @Published var healthApiKey: String = ""

    init() {
        token = KeychainService.load(key: KeychainService.tokenKey) ?? ""
        refreshToken = KeychainService.load(key: KeychainService.refreshTokenKey) ?? ""
        healthApiKey = KeychainService.load(key: KeychainService.healthApiKeyKey) ?? ""
        userName = UserDefaults.standard.string(forKey: "userName") ?? ""
        userId = UserDefaults.standard.integer(forKey: "userId")
        isLoggedIn = !token.isEmpty
    }

    func login(token: String, refreshToken: String? = nil, user: UserInfo) {
        self.token = token
        self.refreshToken = refreshToken ?? ""
        self.userName = user.displayName
        self.userId = user.id
        KeychainService.save(key: KeychainService.tokenKey, value: token)
        if let rt = refreshToken { KeychainService.save(key: KeychainService.refreshTokenKey, value: rt) }
        UserDefaults.standard.set(user.displayName, forKey: "userName")
        UserDefaults.standard.set(user.id, forKey: "userId")
        isLoggedIn = true
    }

    func updateTokens(accessToken: String, refreshToken: String?) {
        self.token = accessToken
        KeychainService.save(key: KeychainService.tokenKey, value: accessToken)
        if let rt = refreshToken {
            self.refreshToken = rt
            KeychainService.save(key: KeychainService.refreshTokenKey, value: rt)
        }
    }

    func setHealthApiKey(_ key: String) {
        self.healthApiKey = key
        KeychainService.save(key: KeychainService.healthApiKeyKey, value: key)
    }

    func logout() {
        token = ""; refreshToken = ""; userName = ""; userId = 0
        KeychainService.delete(key: KeychainService.tokenKey)
        KeychainService.delete(key: KeychainService.refreshTokenKey)
        UserDefaults.standard.removeObject(forKey: "userName")
        UserDefaults.standard.removeObject(forKey: "userId")
        isLoggedIn = false
    }
}