//
//  SettingSegmentedTableViewCell.swift
//  Earthquake Network
//
//  Created by Busi Andrea on 27/08/2020.
//  Copyright © 2020 Earthquake Network. All rights reserved.
//

import Foundation


class SettingSegmentedTableViewCell: UITableViewCell {

    static let Identifier = "SegmentedCell"
    
    var isDisabled: Bool = false {
        didSet {
            updateUI()
        }
    }
    var valueChanged: ((EQNGenericValue) -> Void)?
    private var items = [EQNGenericValue]()
    
    // MARK: - Properties
    
    lazy var titleLabel: UILabel = {
        let label = UILabel()
        label.translatesAutoresizingMaskIntoConstraints = false
        label.numberOfLines = 0
        label.font = UIFont.preferredFont(forTextStyle: .body)
        label.textColor = AppTheme.shared.textColor
        return label
    }()
    
    lazy var segmentedControl: UISegmentedControl = {
        let segmented = UISegmentedControl()
        segmented.translatesAutoresizingMaskIntoConstraints = false
        segmented.addTarget(self, action: #selector(segmentedControlChanged(_:)), for: .valueChanged)
        return segmented
    }()
    
    // MARK: - Init
    
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        setupUI()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        setupUI()
    }

    // MARK: - Private
    
    private func setupUI() {
        selectionStyle = .none

        let stackView = UIStackView()
        stackView.translatesAutoresizingMaskIntoConstraints = false
        stackView.axis = .vertical
        stackView.distribution = .equalSpacing
        stackView.spacing = 8
        
        stackView.addArrangedSubview(titleLabel)
        stackView.addArrangedSubview(segmentedControl)
        
        contentView.addSubview(stackView)
        
        stackView.topAnchor.constraint(equalTo: contentView.layoutMarginsGuide.topAnchor).isActive = true
        stackView.trailingAnchor.constraint(equalTo: contentView.layoutMarginsGuide.trailingAnchor).isActive = true
        stackView.leadingAnchor.constraint(equalTo: contentView.layoutMarginsGuide.leadingAnchor).isActive = true
        stackView.bottomAnchor.constraint(equalTo: contentView.layoutMarginsGuide.bottomAnchor).isActive = true
    }
        
    private func updateUI() {
        let theme = AppTheme.shared
        titleLabel.textColor = isDisabled ? theme.textDisabledColor : theme.textColor
        segmentedControl.isEnabled = !isDisabled
    }
    
    // MARK: - Actions
    
    @objc private func segmentedControlChanged(_ sender: UISegmentedControl) {
        let item = items[sender.selectedSegmentIndex]
        valueChanged?(item)
    }
    
    // MARK: - Public
    
    @objc func configureControl(with items: [EQNGenericValue], current: EQNGenericValue) {
        self.items = items
        
        segmentedControl.removeAllSegments()
        items.enumerated().forEach { (index, value) in
            segmentedControl.insertSegment(withTitle: value.display, at: index, animated: false)
        }
        
        if let index = items.firstIndex(of: current) {
            segmentedControl.selectedSegmentIndex = index
        }
    }
}