session-ios/Session/Home/GlobalSearch/EmptySearchResultCell.swift

// Copyright © 2022 Rangeproof Pty Ltd. All rights reserved.

import UIKit
import SessionUIKit
import SessionUtilitiesKit
import NVActivityIndicatorView

class EmptySearchResultCell: UITableViewCell {
    private lazy var messageLabel: UILabel = {
        let result = UILabel()
        result.text = "searchMatchesNone".localized()
        result.themeTextColor = .textPrimary
        result.textAlignment = .center
        result.numberOfLines = 3
        
        return result
    }()
    
    private let spinner: NVActivityIndicatorView = {
        let result: NVActivityIndicatorView = NVActivityIndicatorView(
            frame: CGRect.zero,
            type: .circleStrokeSpin,
            color: .black,
            padding: nil
        )
        result.set(.width, to: 40)
        result.set(.height, to: 40)
        
        ThemeManager.onThemeChange(observer: result) { [weak result] theme, _ in
            guard let textPrimary: UIColor = theme.color(for: .textPrimary) else { return }
            
            result?.color = textPrimary
        }
        
        return result
    }()
    
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        
        themeBackgroundColor = .clear
        selectionStyle = .none
        
        contentView.addSubview(messageLabel)
        messageLabel.set(.height, to: 150)
        messageLabel.pin(.top, greaterThanOrEqualTo: .top, of: contentView)
        messageLabel.pin(.leading, greaterThanOrEqualTo: .leading, of: contentView)
        messageLabel.pin(.bottom, lessThanOrEqualTo: .bottom, of: contentView)
        messageLabel.pin(.trailing, lessThanOrEqualTo: .trailing, of: contentView)
        messageLabel.center(in: contentView)
        messageLabel.setContentHugging(to: .required)
        messageLabel.setCompressionResistance(to: .required)

        contentView.addSubview(spinner)
        spinner.center(in: contentView)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    public func configure(isLoading: Bool) {
        if isLoading {
            // Calling stopAnimating() here is a workaround for
            // the spinner won't change its colour as the theme changed.
            spinner.stopAnimating()
            spinner.startAnimating()
            messageLabel.isHidden = true
        }
        else {
            spinner.stopAnimating()
            messageLabel.isHidden = false
        }
    }
}