import Foundation
import MBProgressHUD
import ThreemaMacros

final class LinkEmailViewController: ThemedTableViewController {
    
    @IBOutlet var emailTextFieldTitle: UILabel!
    @IBOutlet var emailTextField: UITextField!
    var serverName = ""
    
    // MARK: - Lifecycle
    
    override func viewDidLoad() {
        super.viewDidLoad()
        navigationItem.title = #localize("link_email_title")
        navigationItem.rightBarButtonItem?.title = #localize("save")
        navigationItem.leftBarButtonItem?.title = #localize("cancel")
        emailTextField.placeholder = #localize("link_email_textfield_placeholder")
        emailTextFieldTitle.text = #localize("link_email_textfield_title")
        emailTextField.keyboardAppearance = UIKeyboardAppearance.default
        
        emailTextFieldTitle.textColor = .label
        
        ServerInfoProviderFactory.makeServerInfoProvider()
            .directoryServer(ipv6: UserSettings.shared().enableIPv6) { directoryServerInfo, _ in
                if let urlString = directoryServerInfo?.url,
                   let url = URL(string: urlString) {
                    self.serverName = url.host ?? ""
                }
            }
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        emailTextField.text = MyIdentityStore.shared().linkedEmail
        
        if let mdmSetup = MDMSetup(), mdmSetup.readonlyProfile() {
            emailTextField.isEnabled = false
        }
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        if emailTextField.isEnabled {
            emailTextField.becomeFirstResponder()
        }
    }

    // MARK: - TableViewDelegates
    
    override func tableView(_ tableView: UITableView, titleForFooterInSection section: Int) -> String? {
        if TargetManager.isOnPrem {
            return String.localizedStringWithFormat(
                #localize("myprofile_link_email_onprem_footer"),
                serverName,
                TargetManager.appName
            )
        }
        return String.localizedStringWithFormat(
            #localize("myprofile_link_email_footer"),
            TargetManager.appName
        )
    }
    
    // MARK: - Helper functions
    
    @IBAction func saveAction(_ sender: Any) {
        if emailTextField.text == MyIdentityStore.shared().linkedEmail {
            dismiss(animated: true, completion: nil)
            return
        }
        navigationItem.rightBarButtonItem?.isEnabled = false
        emailTextField.resignFirstResponder()
        MBProgressHUD.showAdded(to: view, animated: true)
        
        let conn = ServerAPIConnector()
        conn.linkEmail(
            with: MyIdentityStore.shared(),
            email: emailTextField.text,
            onCompletion: { [self] linked in
                
                MBProgressHUD.hide(for: view, animated: true)
                if let text = emailTextField.text, !text.isEmpty, !linked {
                    UIAlertTemplate.showOKAlert(
                        owner: self,
                        title: #localize("link_email_sent_title"),
                        message: String.localizedStringWithFormat(
                            #localize("link_email_sent_message"), text
                        ), actionOk: { [self] _ in
                            dismiss(animated: true)
                        }
                    )
                }
                else {
                    dismiss(animated: true, completion: nil)
                }
                
            }, onError: { _ in
                MBProgressHUD.hide(for: self.view, animated: true)
                self.navigationItem.rightBarButtonItem?.isEnabled = true
                UIAlertTemplate.showOKAlert(
                    owner: self,
                    title: #localize("invalid_email_address_title"),
                    message: #localize("invalid_email_address_message"),
                    actionOk: nil
                )
            }
        )
    }
    
    @IBAction func cancelAction(_ sender: Any) {
        dismiss(animated: true, completion: nil)
    }
}