Swift

// Add your API key to Info.plist or use environment variables
let apiKey = "kms_your_api_key.live_..."

import Foundation

class KeplarsEmailClient {
    private let apiKey: String
    private let baseURL: String
    private let session: URLSession
    
    init(apiKey: String, baseURL: String = "https://api.keplars.com") {
        self.apiKey = apiKey
        self.baseURL = baseURL
        self.session = URLSession.shared
    }
    
    func sendEmail(
        to: String,
        subject: String,
        body: String,
        isHTML: Bool = false,
        completion: @escaping (Result<[String: Any], Error>) -> Void
    ) {
        makeRequest(endpoint: "/api/v1/send-email/async", to: to, subject: subject, body: body, isHTML: isHTML, completion: completion)
    }
    
    func sendInstantEmail(
        to: String,
        subject: String,
        body: String,
        isHTML: Bool = false,
        completion: @escaping (Result<[String: Any], Error>) -> Void
    ) {
        makeRequest(endpoint: "/api/v1/send-email/instant", to: to, subject: subject, body: body, isHTML: isHTML, completion: completion)
    }
    
    private func makeRequest(
        endpoint: String,
        to: String,
        subject: String,
        body: String,
        isHTML: Bool,
        completion: @escaping (Result<[String: Any], Error>) -> Void
    ) {
        guard let url = URL(string: "\(baseURL)\(endpoint)") else {
            completion(.failure(KeplarsError.invalidURL))
            return
        }
        
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
        request.setValue("Bearer \(apiKey)", forHTTPHeaderField: "Authorization")
        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
        
        let payload: [String: Any] = [
            "to": [to],
            "subject": subject,
            "body": body,
            "is_html": isHTML
        ]
        
        do {
            request.httpBody = try JSONSerialization.data(withJSONObject: payload)
        } catch {
            completion(.failure(error))
            return
        }
        
        session.dataTask(with: request) { data, response, error in
            if let error = error {
                completion(.failure(error))
                return
            }
            
            guard let httpResponse = response as? HTTPURLResponse,
                  let data = data else {
                completion(.failure(KeplarsError.invalidResponse))
                return
            }
            
            if httpResponse.statusCode == 200 {
                do {
                    if let jsonResponse = try JSONSerialization.jsonObject(with: data) as? [String: Any] {
                        completion(.success(jsonResponse))
                    } else {
                        completion(.failure(KeplarsError.invalidJSON))
                    }
                } catch {
                    completion(.failure(error))
                }
            } else {
                completion(.failure(KeplarsError.httpError(httpResponse.statusCode)))
            }
        }.resume()
    }
}

enum KeplarsError: Error {
    case invalidURL
    case invalidResponse
    case invalidJSON
    case noData
    case httpError(Int)
}

class EmailService {
    private let client: KeplarsEmailClient
    
    init() {
        guard let apiKey = Bundle.main.object(forInfoDictionaryKey: "KEPLARS_API_KEY") as? String else {
            fatalError("KEPLARS_API_KEY not found in Info.plist")
        }
        self.client = KeplarsEmailClient(apiKey: apiKey)
    }
    
    func sendWelcomeEmail(to userEmail: String, name userName: String, completion: @escaping (Bool) -> Void) {
        let htmlBody = """
            <h1>Welcome \(userName)!</h1>
            <p>Thank you for joining our platform.</p>
        """
        
        client.sendEmail(to: userEmail, subject: "Welcome \(userName)!", body: htmlBody, isHTML: true) { result in
            DispatchQueue.main.async {
                switch result {
                case .success(let response):
                    print("Email sent: \(response)")
                    completion(true)
                case .failure(let error):
                    print("Failed to send email: \(error)")
                    completion(false)
                }
            }
        }
    }
    
    func sendVerificationEmail(to userEmail: String, code: String, completion: @escaping (Bool) -> Void) {
        let body = "Your verification code: \(code)"
        
        client.sendInstantEmail(to: userEmail, subject: "Verify Your Email", body: body, isHTML: false) { result in
            DispatchQueue.main.async {
                switch result {
                case .success(let response):
                    print("Verification email sent: \(response)")
                    completion(true)
                case .failure(let error):
                    print("Failed to send verification email: \(error)")
                    completion(false)
                }
            }
        }
    }
}

import SwiftUI

struct EmailView: View {
    @State private var email = ""
    @State private var name = ""
    @State private var isLoading = false
    @State private var showAlert = false
    @State private var alertMessage = ""
    
    private let emailService = EmailService()
    
    var body: some View {
        VStack(spacing: 20) {
            TextField("Email", text: $email)
                .textFieldStyle(RoundedBorderTextFieldStyle())
                .keyboardType(.emailAddress)
                .autocapitalization(.none)
            
            TextField("Name", text: $name)
                .textFieldStyle(RoundedBorderTextFieldStyle())
            
            Button("Send Welcome Email") {
                sendEmail()
            }
            .disabled(isLoading || email.isEmpty || name.isEmpty)
            
            if isLoading {
                ProgressView()
            }
        }
        .padding()
        .alert("Email Status", isPresented: $showAlert) {
            Button("OK") { }
        } message: {
            Text(alertMessage)
        }
    }
    
    private func sendEmail() {
        isLoading = true
        
        emailService.sendWelcomeEmail(to: email, name: name) { success in
            isLoading = false
            alertMessage = success ? "Email sent successfully!" : "Failed to send email"
            showAlert = true
        }
    }
}

struct ContentView: View {
    var body: some View {
        NavigationView {
            EmailView()
                .navigationTitle("Keplars Email")
        }
    }
}

import UIKit

class EmailViewController: UIViewController {
    @IBOutlet weak var emailTextField: UITextField!
    @IBOutlet weak var nameTextField: UITextField!
    @IBOutlet weak var sendButton: UIButton!
    @IBOutlet weak var activityIndicator: UIActivityIndicatorView!
    
    private let emailService = EmailService()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setupUI()
    }
    
    private func setupUI() {
        title = "Send Email"
        emailTextField.keyboardType = .emailAddress
        emailTextField.autocapitalizationType = .none
    }
    
    @IBAction func sendEmailTapped(_ sender: UIButton) {
        guard let email = emailTextField.text, !email.isEmpty,
              let name = nameTextField.text, !name.isEmpty else {
            showAlert(message: "Please fill in all fields")
            return
        }
        
        setLoading(true)
        
        emailService.sendWelcomeEmail(to: email, name: name) { [weak self] success in
            self?.setLoading(false)
            let message = success ? "Email sent successfully!" : "Failed to send email"
            self?.showAlert(message: message)
        }
    }
    
    private func setLoading(_ loading: Bool) {
        sendButton.isEnabled = !loading
        if loading {
            activityIndicator.startAnimating()
        } else {
            activityIndicator.stopAnimating()
        }
    }
    
    private func showAlert(message: String) {
        let alert = UIAlertController(title: "Email Status", message: message, preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "OK", style: .default))
        present(alert, animated: true)
    }
}

extension KeplarsEmailClient {
    @available(iOS 13.0, *)
    func sendEmail(
        to: String,
        subject: String,
        body: String,
        isHTML: Bool = false
    ) async throws -> [String: Any] {
        return try await withCheckedThrowingContinuation { continuation in
            sendEmail(to: to, subject: subject, body: body, isHTML: isHTML) { result in
                continuation.resume(with: result)
            }
        }
    }
    
    @available(iOS 13.0, *)
    func sendInstantEmail(
        to: String,
        subject: String,
        body: String,
        isHTML: Bool = false
    ) async throws -> [String: Any] {
        return try await withCheckedThrowingContinuation { continuation in
            sendInstantEmail(to: to, subject: subject, body: body, isHTML: isHTML) { result in
                continuation.resume(with: result)
            }
        }
    }
}

// Usage with async/await
class ModernEmailService {
    private let client = KeplarsEmailClient(apiKey: "your_api_key")
    
    @available(iOS 13.0, *)
    func sendWelcomeEmail(to email: String, name: String) async throws {
        let htmlBody = "<h1>Welcome \(name)!</h1><p>Thank you for joining our platform.</p>"
        let response = try await client.sendEmail(to: email, subject: "Welcome \(name)!", body: htmlBody, isHTML: true)
        print("Email sent: \(response)")
    }
}