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import UIKit

class DeckBuilderViewController: UIViewController {
    
    // UI Elements
    let lengthTextField = UITextField()
    let widthTextField = UITextField()
    let heightTextField = UITextField()
    let buildButton = UIButton()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setupUI()
    }
    
    func setupUI() {
        // Setup text fields
        lengthTextField.placeholder = "Length"
        widthTextField.placeholder = "Width"
        heightTextField.placeholder = "Height"
        
        // Setup build button
        buildButton.setTitle("Build Deck", for: .normal)
        buildButton.addTarget(self, action: #selector(buildDeck), for: .touchUpInside)
        
        // Add subviews
        view.addSubview(lengthTextField)
        view.addSubview(widthTextField)
        view.addSubview(heightTextField)
        view.addSubview(buildButton)
        
        // Layout constraints
        lengthTextField.translatesAutoresizingMaskIntoConstraints = false
        widthTextField.translatesAutoresizingMaskIntoConstraints = false
        heightTextField.translatesAutoresizingMaskIntoConstraints = false
        buildButton.translatesAutoresizingMaskIntoConstraints = false
        
        NSLayoutConstraint.activate([
            lengthTextField.topAnchor.constraint(equalTo: view.topAnchor, constant: 50),
            lengthTextField.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20),
            lengthTextField.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -20),
            lengthTextField.heightAnchor.constraint(equalToConstant: 40),
            
            widthTextField.topAnchor.constraint(equalTo: lengthTextField.bottomAnchor, constant: 20),
            widthTextField.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20),
            widthTextField.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -20),
            widthTextField.heightAnchor.constraint(equalToConstant: 40),
            
            heightTextField.topAnchor.constraint(equalTo: widthTextField.bottomAnchor, constant: 20),
            heightTextField.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20),
            heightTextField.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -20),
            heightTextField.heightAnchor.constraint(equalToConstant: 40),
            
            buildButton.topAnchor.constraint(equalTo: heightTextField.bottomAnchor, constant: 20),
            buildButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20),
            buildButton.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -20),
            buildButton.heightAnchor.constraint(equalToConstant: 40),
        ])
    }
    
    @objc func buildDeck() {
        guard let lengthText = lengthTextField.text,
              let widthText = widthTextField.text,
              let heightText = heightTextField.text,
              let length = Double(lengthText),
              let width = Double(widthText),
              let height = Double(heightText) else {
            // Show error message
            return
        }
        
        // Calculate deck area
        let area = length * width
        
        // Check compliance with building code
        let complianceMessage = checkCompliance(area: area, height: height)
        
        // Show compliance message
        let alertController = UIAlertController(title: "Compliance", message: complianceMessage, preferredStyle: .alert)
        let okAction = UIAlertAction(title: "OK", style: .default, handler: nil)
        alertController.addAction(okAction)
        present(alertController, animated: true, completion: nil)
    }
    
    func checkCompliance(area: Double, height: Double) -> String {
        // Logic to check compliance with building code
        // This could involve checking against specific regulations and standards
        // For New Zealand building code, you would need to implement the relevant regulations for deck construction
        // For simplicity, let's assume a basic compliance check
        
        let maxArea: Double = 50.0
        let maxHeight: Double = 2.5
        
        if area > maxArea {
            return "Deck area exceeds maximum allowed."
        } else if height > maxHeight {
            return "Deck height exceeds maximum allowed."
        } else {
            return "Deck complies with building code."
        }
    }
}