//                              Apache License
//                        Version 2.0, January 2004
//                     http://www.apache.org/licenses/
//
//TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
//
//1. Definitions.
//
//   "License" shall mean the terms and conditions for use, reproduction,
//   and distribution as defined by Sections 1 through 9 of this document.
//
//   "Licensor" shall mean the copyright owner or entity authorized by
//   the copyright owner that is granting the License.
//
//   "Legal Entity" shall mean the union of the acting entity and all
//   other entities that control, are controlled by, or are under common
//   control with that entity. For the purposes of this definition,
//   "control" means (i) the power, direct or indirect, to cause the
//   direction or management of such entity, whether by contract or
//   otherwise, or (ii) ownership of fifty percent (50%) or more of the
//   outstanding shares, or (iii) beneficial ownership of such entity.
//
//   "You" (or "Your") shall mean an individual or Legal Entity
//   exercising permissions granted by this License.
//
//   "Source" form shall mean the preferred form for making modifications,
//   including but not limited to software source code, documentation
//   source, and configuration files.
//
//   "Object" form shall mean any form resulting from mechanical
//   transformation or translation of a Source form, including but
//   not limited to compiled object code, generated documentation,
//   and conversions to other media types.
//
//   "Work" shall mean the work of authorship, whether in Source or
//   Object form, made available under the License, as indicated by a
//   copyright notice that is included in or attached to the work
//   (an example is provided in the Appendix below).
//
//   "Derivative Works" shall mean any work, whether in Source or Object
//   form, that is based on (or derived from) the Work and for which the
//   editorial revisions, annotations, elaborations, or other modifications
//   represent, as a whole, an original work of authorship. For the purposes
//   of this License, Derivative Works shall not include works that remain
//   separable from, or merely link (or bind by name) to the interfaces of,
//   the Work and Derivative Works thereof.
//
//   "Contribution" shall mean any work of authorship, including
//   the original version of the Work and any modifications or additions
//   to that Work or Derivative Works thereof, that is intentionally
//   submitted to Licensor for inclusion in the Work by the copyright owner
//   or by an individual or Legal Entity authorized to submit on behalf of
//   the copyright owner. For the purposes of this definition, "submitted"
//   means any form of electronic, verbal, or written communication sent
//   to the Licensor or its representatives, including but not limited to
//   communication on electronic mailing lists, source code control systems,
//   and issue tracking systems that are managed by, or on behalf of, the
//   Licensor for the purpose of discussing and improving the Work, but
//   excluding communication that is conspicuously marked or otherwise
//   designated in writing by the copyright owner as "Not a Contribution."
//
//   "Contributor" shall mean Licensor and any individual or Legal Entity
//   on behalf of whom a Contribution has been received by Licensor and
//   subsequently incorporated within the Work.
//
//2. Grant of Copyright License. Subject to the terms and conditions of
//   this License, each Contributor hereby grants to You a perpetual,
//   worldwide, non-exclusive, no-charge, royalty-free, irrevocable
//   copyright license to reproduce, prepare Derivative Works of,
//   publicly display, publicly perform, sublicense, and distribute the
//   Work and such Derivative Works in Source or Object form.
//
//3. Grant of Patent License. Subject to the terms and conditions of
//   this License, each Contributor hereby grants to You a perpetual,
//   worldwide, non-exclusive, no-charge, royalty-free, irrevocable
//   (except as stated in this section) patent license to make, have made,
//   use, offer to sell, sell, import, and otherwise transfer the Work,
//   where such license applies only to those patent claims licensable
//   by such Contributor that are necessarily infringed by their
//   Contribution(s) alone or by combination of their Contribution(s)
//   with the Work to which such Contribution(s) was submitted. If You
//   institute patent litigation against any entity (including a
//   cross-claim or counterclaim in a lawsuit) alleging that the Work
//   or a Contribution incorporated within the Work constitutes direct
//   or contributory patent infringement, then any patent licenses
//   granted to You under this License for that Work shall terminate
//   as of the date such litigation is filed.
//
//4. Redistribution. You may reproduce and distribute copies of the
//   Work or Derivative Works thereof in any medium, with or without
//   modifications, and in Source or Object form, provided that You
//   meet the following conditions:
//
//   (a) You must give any other recipients of the Work or
//       Derivative Works a copy of this License; and
//
//   (b) You must cause any modified files to carry prominent notices
//       stating that You changed the files; and
//
//   (c) You must retain, in the Source form of any Derivative Works
//       that You distribute, all copyright, patent, trademark, and
//       attribution notices from the Source form of the Work,
//       excluding those notices that do not pertain to any part of
//       the Derivative Works; and
//
//   (d) If the Work includes a "NOTICE" text file as part of its
//       distribution, then any Derivative Works that You distribute must
//       include a readable copy of the attribution notices contained
//       within such NOTICE file, excluding those notices that do not
//       pertain to any part of the Derivative Works, in at least one
//       of the following places: within a NOTICE text file distributed
//       as part of the Derivative Works; within the Source form or
//       documentation, if provided along with the Derivative Works; or,
//       within a display generated by the Derivative Works, if and
//       wherever such third-party notices normally appear. The contents
//       of the NOTICE file are for informational purposes only and
//       do not modify the License. You may add Your own attribution
//       notices within Derivative Works that You distribute, alongside
//       or as an addendum to the NOTICE text from the Work, provided
//       that such additional attribution notices cannot be construed
//       as modifying the License.
//
//   You may add Your own copyright statement to Your modifications and
//   may provide additional or different license terms and conditions
//   for use, reproduction, or distribution of Your modifications, or
//   for any such Derivative Works as a whole, provided Your use,
//   reproduction, and distribution of the Work otherwise complies with
//   the conditions stated in this License.
//
//5. Submission of Contributions. Unless You explicitly state otherwise,
//   any Contribution intentionally submitted for inclusion in the Work
//   by You to the Licensor shall be under the terms and conditions of
//   this License, without any additional terms or conditions.
//   Notwithstanding the above, nothing herein shall supersede or modify
//   the terms of any separate license agreement you may have executed
//   with Licensor regarding such Contributions.
//
//6. Trademarks. This License does not grant permission to use the trade
//   names, trademarks, service marks, or product names of the Licensor,
//   except as required for reasonable and customary use in describing the
//   origin of the Work and reproducing the content of the NOTICE file.
//
//7. Disclaimer of Warranty. Unless required by applicable law or
//   agreed to in writing, Licensor provides the Work (and each
//   Contributor provides its Contributions) on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
//   implied, including, without limitation, any warranties or conditions
//   of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
//   PARTICULAR PURPOSE. You are solely responsible for determining the
//   appropriateness of using or redistributing the Work and assume any
//   risks associated with Your exercise of permissions under this License.
//
//8. Limitation of Liability. In no event and under no legal theory,
//   whether in tort (including negligence), contract, or otherwise,
//   unless required by applicable law (such as deliberate and grossly
//   negligent acts) or agreed to in writing, shall any Contributor be
//   liable to You for damages, including any direct, indirect, special,
//   incidental, or consequential damages of any character arising as a
//   result of this License or out of the use or inability to use the
//   Work (including but not limited to damages for loss of goodwill,
//   work stoppage, computer failure or malfunction, or any and all
//   other commercial damages or losses), even if such Contributor
//   has been advised of the possibility of such damages.
//
//9. Accepting Warranty or Additional Liability. While redistributing
//   the Work or Derivative Works thereof, You may choose to offer,
//   and charge a fee for, acceptance of support, warranty, indemnity,
//   or other liability obligations and/or rights consistent with this
//   License. However, in accepting such obligations, You may act only
//   on Your own behalf and on Your sole responsibility, not on behalf
//   of any other Contributor, and only if You agree to indemnify,
//   defend, and hold each Contributor harmless for any liability
//   incurred by, or claims asserted against, such Contributor by reason
//   of your accepting any such warranty or additional liability.
//
//END OF TERMS AND CONDITIONS
//
//APPENDIX: How to apply the Apache License to your work.
//
//   To apply the Apache License to your work, attach the following
//   boilerplate notice, with the fields enclosed by brackets "[]"
//   replaced with your own identifying information. (Don't include
//   the brackets!)  The text should be enclosed in the appropriate
//   comment syntax for the file format. We also recommend that a
//   file or class name and description of purpose be included on the
//   same "printed page" as the copyright notice for easier
//   identification within third-party archives.
//
//Copyright 2019 mongodb
//
//Licensed under the Apache License, Version 2.0 (the "License");
//you may not use this file except in compliance with the License.
//You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
//Unless required by applicable law or agreed to in writing, software
//distributed under the License is distributed on an "AS IS" BASIS,
//WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//See the License for the specific language governing permissions and
//limitations under the License.

import SwiftUI

// global vars
// This is the introducion view
class IntroViewController: BaseViewController, UITextFieldDelegate {
  
    
    @IBOutlet weak var checkBoxTCPP: UIButton!
    @IBOutlet weak var startDrawingButton: UIButton!
    @IBOutlet weak var agreedToTermsButton: UIButton!
    @IBOutlet weak var emailField: UITextField!

    var agreedToTerms = false
    var gotValidEmail = false
    
   
    override func viewDidLoad() {
       super.viewDidLoad()
        ErrorReporter.resetError()
        print("IntroViewController.viewDidLoad")
        self.hideKeyboardWhenTappedAround()
        gotValidEmail = false
        agreedToTerms = false
        checkBoxTCPP.isSelected = false
        configDrawingButton()
        
        self.emailField.delegate = self
    }
    
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        self.view.endEditing(true)
        return false
    }
    
    @IBAction func enteringEmailField(_ sender: UITextField) {
        let _ = isValidEmail(emailStr: emailField.text ?? "")
    }
    func configDrawingButton() {
        startDrawingButton.backgroundColor = (agreedToTerms && gotValidEmail)
          ? UIColor(red: 19/255, green: 164/255, blue: 63/255, alpha: 1.0) : UIColor.lightGray
               startDrawingButton.isEnabled = (agreedToTerms && gotValidEmail) ? true : false
    }
    func isValidEmail(emailStr:String) -> Bool {
        let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}"
        let emailPred = NSPredicate(format:"SELF MATCHES %@", emailRegEx)
        gotValidEmail = emailPred.evaluate(with: emailStr)
      configDrawingButton()
        return gotValidEmail
    }
    @IBAction func agreeToTermsButton(_ sender: UIButton) {
       
        self.view.endEditing(false)
        sender.isSelected = !sender.isSelected
        agreedToTerms = sender.isSelected
        configDrawingButton()
    }

  @IBAction func startDrawingPressed(_ sender: Any) {
        if !isValidEmail(emailStr: emailField.text ?? "") {
            // create the alert
            let alert = UIAlertController(title: "Ooops!", message: "Please enter a valid email", preferredStyle: UIAlertController.Style.alert)
            // add an action (button)
            alert.addAction(UIAlertAction(title: "OK", style: UIAlertAction.Style.default, handler: nil))
            // show the alert
            self.present(alert, animated: true, completion: nil)
            return
        } else if !agreedToTerms {
            // create the alert
            let alert = UIAlertController(title: "Ooops!", message: "You must agree to the Terms & Conditions", preferredStyle: UIAlertController.Style.alert)
            // add an action (button)
            alert.addAction(UIAlertAction(title: "OK", style: UIAlertAction.Style.default, handler: nil))
            // show the alert
            self.present(alert, animated: true, completion: nil)
            return
        }
        User.email = emailField.text!
        emailField.text = ""
        emailField.endEditing(true)
        agreedToTerms = false
        agreedToTermsButton.isSelected = false
        startDrawingButton.backgroundColor = UIColor.lightGray
        startDrawingButton.isEnabled = false
        
        let vc = UIStoryboard.init(name: "Main", bundle: Bundle.main).instantiateViewController(withIdentifier: "DrawViewController") as? DrawViewController
        self.navigationController!.pushViewController(vc!, animated: true)

    }
    // TODO Remove?
    override func shouldPerformSegue(withIdentifier identifier: String, sender: Any?) -> Bool {
        if identifier == "startDrawingSegue" { // you define it in the storyboard (click on the segue, then Attributes' inspector > Identifier
            
            if !isValidEmail(emailStr: emailField.text ?? "") {
                // create the alert
                let alert = UIAlertController(title: "Ooops!", message: "Please enter a valid email", preferredStyle: UIAlertController.Style.alert)
                // add an action (button)
                alert.addAction(UIAlertAction(title: "OK", style: UIAlertAction.Style.default, handler: nil))
                // show the alert
                self.present(alert, animated: true, completion: nil)
                return false
            } else if !agreedToTerms {
                // create the alert
                let alert = UIAlertController(title: "Ooops!", message: "You must agree to the Terms & Conditions", preferredStyle: UIAlertController.Style.alert)
                // add an action (button)
                alert.addAction(UIAlertAction(title: "OK", style: UIAlertAction.Style.default, handler: nil))
                // show the alert
                self.present(alert, animated: true, completion: nil)
                return false
            }
            else {
                return true
            }
        }
        return true
    }
}


// Put this piece of code anywhere you like
extension UIViewController {
    func hideKeyboardWhenTappedAround() {
        let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(UIViewController.dismissKeyboard))
        tap.cancelsTouchesInView = false
        view.addGestureRecognizer(tap)
    }

    @objc func dismissKeyboard() {
        view.endEditing(true)
    }
}
