import UIKit

struct ErrorModel {
    let code: Int
    let title: String
    let message: String
}

struct User {
    let firstName: String
    let lastName: String
    let phoneNumber: String
    let emailAddress: String
}

protocol AuthService {
    func authenticateUser(emailAddress: String, password: String, completionHandler: (User?) -> Void)
}

protocol AuthServiceComponent {
    static var authService: AuthService { get }
    static func createAuthService() -> AuthService
}

struct TestAuthService: AuthService {
    func authenticateUser(emailAddress: String, password: String, completionHandler: (User?) -> Void) {
        if emailAddress == "nishant.shrestha@hotmail.com" && password == "password" {
            let user = User(firstName: "Nishant", lastName: "Shrestha", phoneNumber: "0478578673", emailAddress: emailAddress)
            completionHandler(user)
        } else {
            completionHandler(nil)
        }
    }
}

protocol TestAuthServiceComponent: AuthServiceComponent {}

extension TestAuthServiceComponent {
    static func createAuthService() -> AuthService {
        return TestAuthService()
    }
}

enum TestContext: TestAuthServiceComponent {
    public static let authService = TestContext.createAuthService()
}


let testEmailAddress = "nishant.shrestha@hotmail.com"
let testPassword = "password"

TestContext.authService.authenticateUser(emailAddress: testEmailAddress, password: testPassword, completionHandler: { (user) in
    guard let user = user else { return }
    print("test authentication successful.")
    print(user)
    print("----")
})


struct AlamofireAuthService: AuthService {
    func authenticateUser(emailAddress: String, password: String, completionHandler: (User?) -> Void) {
        let params = [
            "email_address": emailAddress,
            "password": password
        ]

        // TODO: Implement network request
        let user = User(firstName: "Nishant", lastName: "Shrestha", phoneNumber: "0478578673", emailAddress: emailAddress)
        completionHandler(user)
    }
}

protocol AlamofireAuthServiceComponent: AuthServiceComponent {}

extension AlamofireAuthServiceComponent {
    static func createAuthService() -> AuthService {
        return AlamofireAuthService()
    }
}

enum ProductionContext: AlamofireAuthServiceComponent {
    public static let authService = ProductionContext.createAuthService()
}

ProductionContext.authService.authenticateUser(emailAddress: "nishant.shrestha@hotmail.com", password: "password") { (user) in
    if let user = user {
        print("production authentication succesful")
        print(user)
    }
}