//

import UIKit

class ExchangeRateCustomView: UIView {

    var passTextFieldText: ((String) -> Void)?
    var didTappedDoneButton: (() -> Void)?
    var didSelectCountry: (() -> ())?
    var isReciver: Bool = false
    var text: String?
    var countryListTapGuesture: UITapGestureRecognizer?
    var updatedText: String? {
        didSet {
            updateText()
        }
    }
    
    var currency: String? {
        didSet {
           updateCurrency()
        }
    }
    
    var flag: UIImage? {
        didSet {
            updateFlag()
        }
    }
    
    var title: String? {
        didSet {
            titleLabel.text = title
        }
    }
    
    private var textfield: CurrencyTextField = {
        let textfield = CurrencyTextField()
        textfield.keyboardType = .numberPad
        textfield.tintColor = .theme2E89FF
        textfield.textColor = .init(hex: "#2E89FF").withAlphaComponent(0.87)
        textfield.font = .sanfrancisco(.semibold, size: 16)
        textfield.translatesAutoresizingMaskIntoConstraints = false
        return textfield
    }()
    
    private var titleLabel: UILabel = {
        let label = UILabel()
        label.font = .sanfrancisco(.semibold, size: 12)
        label.textColor = .themeGray1
        label.translatesAutoresizingMaskIntoConstraints = false
        return label
    }()
    

     var currencyText: UILabel = {
        let text = UILabel()
        text.translatesAutoresizingMaskIntoConstraints = false
        return text
    }()
    
    var flagImageView: UIImageView = {
        let imageView = UIImageView()
        imageView.translatesAutoresizingMaskIntoConstraints = false
        imageView.heightAnchor.constraint(equalToConstant: 40).isActive = true
        imageView.widthAnchor.constraint(equalToConstant: 40).isActive = true
        return imageView
    }()
    
    private var leftStackView: UIStackView!
    private var rightStackView: UIStackView!
    
    init(isReciver: Bool) {
        super.init(frame: .zero)
        self.isReciver = isReciver
        setup()
    }
    
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    private func setup() {
        uiSetup()
        propertiesSetup()
    }
    
    private func uiSetup() {
        leftStackView = UIStackView(arrangedSubviews: [titleLabel, textfield])
        leftStackView.translatesAutoresizingMaskIntoConstraints = false
        leftStackView.axis = .vertical
        leftStackView.distribution = .fill
        leftStackView.spacing = 4
        leftStackView.widthAnchor.constraint(equalToConstant: UIScreen.main.bounds.size.width - 120).isActive = true
        
        rightStackView = UIStackView(arrangedSubviews: [currencyText, flagImageView])
        rightStackView.translatesAutoresizingMaskIntoConstraints = false
        rightStackView.axis = .horizontal
        rightStackView.distribution = .fillEqually
        rightStackView.spacing = 8
        rightStackView.widthAnchor.constraint(equalToConstant: 120).isActive = true
        
        self.addSubviews(leftStackView,
                         rightStackView
        )
        
        leftStackView.anchor(top: self.topAnchor,
                             paddingTop: isReciver ? 16 : 10,
                             bottom: self.bottomAnchor,
                             paddingBottom: -13,
                             left: self.leadingAnchor,
                             paddingLeft: 16
        )
                        
        textfield.passTextFieldText = { [weak self] text in
            self?.text = text
            self?.passTextFieldText?(text)
        }
        
        textfield.didTextFieldEndEditing = { [weak self] _ in
            self?.didTappedDoneButton?()
        }
        
        rightStackView.anchor(right: self.trailingAnchor,
                              paddingRight: -8
        )
        
        rightStackView.center(centerX: nil,
                              paddingX: 0,
                              centerY: self.centerYAnchor,
                              paddingY: 0)
        
        rightStackView.leadingAnchor.constraint(greaterThanOrEqualTo: leftStackView.trailingAnchor, constant: 8).isActive = true
       
        let tap = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(_:)))
        leftStackView.addGestureRecognizer(tap)

    }
    
    private func propertiesSetup() {
        flagImageView.image = UIImage(named: "flag_japan")
        currencyText.text = "JPY"
        currencyText.textColor = .themeBlack
        currencyText.font = .sanfrancisco(.semibold, size: 16)
        
        titleLabel.textColor = .themeBlack.withAlphaComponent(0.6)
        titleLabel.font = .sanfrancisco(.semibold, size: 14)
        
        
        if(isReciver) {
            countryListTapGuesture = UITapGestureRecognizer(target: self, action: #selector(showCurrencyCountryPickerview))
            rightStackView.addGestureRecognizer(countryListTapGuesture ?? UITapGestureRecognizer())
        } else {
            countryListTapGuesture = nil
        }
    }
    
    @objc func handleTap(_ sender: UITapGestureRecognizer? = nil) {
        textfield.becomeFirstResponder()
    }
    
    @objc private func showCurrencyCountryPickerview() {
        didSelectCountry?()
    }
    
    private func  updateText() {
        textfield.text = updatedText
    }
    
    private func updateCurrency()  {
        currencyText.text = currency
    }
    
    private func updateFlag() {
        flagImageView.image = flag
    }

}