//
//  AspectVGrid.swift
//  Memorize
//
//  Created by ching on 2023/2/13.
//

import SwiftUI

struct AspectVGrid<Item, ItemView>: View where ItemView: View, Item: Identifiable {
    var items: [Item]
    var aspectRatio: CGFloat
    var content: (Item) -> ItemView
    var body: some View {
        let width: CGFloat = 100
        LazyVGrid(columns: [GridItem(.adaptive(minimum: width))]) {
            ForEach(items) {
                item in content(item).aspectRatio(aspectRatio, contentMode: .fit)
            }
        }
    }

    private func widthThatFits(itemCount: Int, in size: CGSize, itemAspectRatio: CGFloat) -> CGFloat {
        var columCount = 1
        var rowCount = itemCount

        repeat {
            let itemWidth = size.width / CGFloat(columCount)
            let itemHeight = itemWidth / itemAspectRatio
            if CGFloat(rowCount) * itemHeight < size.height {
                break
            }
            columCount += 1
            rowCount = (itemCount + columCount - 1) / columCount
        } while columCount < itemCount
        
        if columCount > itemCount {
            columCount = itemCount
        }
        return floor(size.width / CGFloat(columCount))
    }
}

// struct AspectVGrid_Previews: PreviewProvider {
//    static var previews: some View {
//        AspectVGrid()
//    }
// }