//
//  ChipStackView.swift
//  Baccarat
//
//  A stacked display of chips representing a bet amount.
//

import SwiftUI

/// A stack of chips showing a bet amount.
struct ChipStackView: View {
    let amount: Int
    let maxChips: Int
    
    // MARK: - Layout Constants
    
    private let chipSize: CGFloat = 40
    private let stackOffset: CGFloat = 4
    
    init(amount: Int, maxChips: Int = 5) {
        self.amount = amount
        self.maxChips = maxChips
    }
    
    private var chipBreakdown: [(ChipDenomination, Int)] {
        var remaining = amount
        var result: [(ChipDenomination, Int)] = []
        
        for denom in ChipDenomination.allCases.reversed() {
            let count = remaining / denom.rawValue
            if count > 0 {
                result.append((denom, min(count, maxChips)))
                remaining -= count * denom.rawValue
            }
        }
        
        return result
    }
    
    var body: some View {
        ZStack {
            ForEach(chipBreakdown.indices, id: \.self) { index in
                let (denom, _) = chipBreakdown[index]
                ChipView(denomination: denom, size: chipSize)
                    .offset(y: CGFloat(-index) * stackOffset)
            }
        }
    }
}

#Preview {
    ZStack {
        Color.Table.preview
            .ignoresSafeArea()
        
        HStack(spacing: Design.Spacing.xxxLarge) {
            ChipStackView(amount: 100)
            ChipStackView(amount: 550)
            ChipStackView(amount: 1500)
            ChipStackView(amount: 10_000)
        }
    }
}