//
//  ItemCollectionViewCell.swift
//  Reader
//
//  Created by Shadowfacts on 1/9/22.
//

import UIKit
import SwiftSoup

class ItemCollectionViewCell: UICollectionViewListCell {
    
    private let titleLabel = UILabel()
    private let feedTitleLabel = UILabel()
    private let contentLabel = UILabel()
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        backgroundConfiguration = .clear()
        
        let descriptor = UIFontDescriptor.preferredFontDescriptor(withTextStyle: .title3).withSymbolicTraits(.traitBold)!.withDesign(.serif)!
        titleLabel.font = UIFont(descriptor: descriptor, size: 0)
        titleLabel.numberOfLines = 0
        
        feedTitleLabel.font = UIFont(descriptor: .preferredFontDescriptor(withTextStyle: .subheadline), size: 0)
        feedTitleLabel.textColor = .tintColor
        
        contentLabel.font = UIFont(descriptor: .preferredFontDescriptor(withTextStyle: .body).withDesign(.serif)!, size: 0)
        contentLabel.textColor = .appContentPreviewLabel
        contentLabel.numberOfLines = 0
        
        let stack = UIStackView(arrangedSubviews: [
            titleLabel,
            feedTitleLabel,
            contentLabel,
        ])
        stack.translatesAutoresizingMaskIntoConstraints = false
        stack.spacing = 8
        stack.axis = .vertical
        addSubview(stack)
        NSLayoutConstraint.activate([
            stack.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 20),
            stack.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -20),
            stack.topAnchor.constraint(equalTo: topAnchor, constant: 8),
            stack.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -8),
            separatorLayoutGuide.leadingAnchor.constraint(equalTo: stack.leadingAnchor),
        ])
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    func updateUI(item: Item) {
        titleLabel.text = item.title
        feedTitleLabel.text = item.feed!.title ?? item.feed!.url?.host
        if let content = item.content {
            let doc = try! SwiftSoup.parse(content)
            contentLabel.text = try! doc.select("p").first()?.text()
        } else {
            contentLabel.text = ""
        }
        contentLabel.isHidden = contentLabel.text?.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty ?? true
    }

}