Kan1aSorata.AIPaint/AIPaint/HomeViewController.swift

//
//  HomeViewController.swift
//  AIPaint
//
//  Created by Fengyu He on 2022/11/29.
//

import UIKit
import SnapKit
import CoreData

class HomeViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
    
    lazy var paintingTableView: UITableView = {
        let tableView = UITableView()
        tableView.separatorStyle = .singleLine
        tableView.separatorInset = UIEdgeInsets(top: 0, left: 20, bottom: 0, right: 20)
        tableView.allowsSelection = true
        tableView.allowsMultipleSelection = false
        return tableView
    }()

    var delegate: AppDelegate?
    var context: NSManagedObjectContext?
    var fetchPainting: NSFetchRequest<Painting>?
    var info: [Painting] = []
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        if UITraitCollection.current.userInterfaceStyle == .dark {
            view.backgroundColor = .black
        } else {
            view.backgroundColor = .white
        }
        self.title = "作品"
        
        delegate = UIApplication.shared.delegate as? AppDelegate
        context = delegate!.persistentContainer.viewContext
        fetchPainting = NSFetchRequest<Painting>.init(entityName: "Painting")
        
        paintingTableView.delegate = self
        paintingTableView.dataSource = self
        view.addSubview(paintingTableView)
        
        paintingTableView.snp.makeConstraints { (make) in
            make.top.equalTo(view.safeAreaLayoutGuide.snp.top)
            make.width.equalTo(view.safeAreaLayoutGuide.snp.width)
            make.height.equalTo(view.safeAreaLayoutGuide.snp.height)
            make.centerX.equalTo(view.safeAreaLayoutGuide.snp.centerX)
        }
    }
    
    override func viewWillAppear(_ animated: Bool) {
        do {
            let paintings = try context?.fetch(fetchPainting!)
            for painting in paintings! {
                if !info.contains(painting) {
                    info.append(painting)
                } else {
                }
            }
        } catch {}
        paintingTableView.reloadData()
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        print("info loaded \(info.count)")
        return info.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = PaintingCell(style: .default, reuseIdentifier: "PaintingCell")
        cell.setValueForCell(painting: info[indexPath.row])
        return cell
    }
    
    
    
    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return 100
    }
    
    override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
        if #available(iOS 13, *) {
                if self.traitCollection.hasDifferentColorAppearance(comparedTo: previousTraitCollection) {
                    if self.traitCollection.userInterfaceStyle == .dark {
                        // 黑夜模式
                        view.backgroundColor = .black
                    } else {
                        // 白天模式
                        view.backgroundColor = .white
                    }
                }
            }
    }
}