RNG_Swift/DiceView.swift

import SwiftUI

struct DiceView: View {
    @State var generated: [Int] = [0]
    @State var displayDies: [Int] = []
    @State var displayMultiDieMode = ""
    @State var multiDieMode = "plus"
    @State var result = 0
    @State var resultDescription = ""
    @State var history: [Int] = []
    let columns = [GridItem(.adaptive(minimum: 25, maximum: 75))]
    @State var dies: Double = 1
    var body: some View {
        VStack {
            List {
                Section("Number of die") {
                    HStack {
                        Text(String(Int(dies)))
                        Slider(value: $dies, in: 1...10, step: 1)
                    }
                }
                Section("Multi die mode") {
                    Picker(selection: $multiDieMode, label: Text("ioug")) {
                        Image(systemName: "plus").tag("plus")
                        Image(systemName: "multiply").tag("multiply")
                    }.pickerStyle(SegmentedPickerStyle())
                }
                Section("Visual") {
                    HStack {
                        Spacer()
                        if displayDies.isEmpty {
                            Text("Results are visualised here when you press the generate button")
                                .font(.subheadline)
                        } else if displayDies.count != Int(dies) {
                            Text("Press Generate")
                                .font(.title)
                        } else {
                            LazyVGrid(columns: columns, spacing: 10) {
                                ForEach(0..<displayDies.count, id: \.self) { index in
                                    Image(systemName: "die.face.\(index > displayDies.count ? Int.random(in: 1...6) : displayDies[index])")
                                        .resizable()
                                        .scaledToFit()
                                        .frame(width: 50, height: 50)
                                    if index != displayDies.count-1 {
                                        Image(systemName: displayMultiDieMode)
                                            .resizable()
                                            .scaledToFit()
                                            .frame(width: 10, height: 10)
                                    }
                                }
                            }.padding()
                        }
                        Spacer()
                    }
                }
                Button("Generate") {
                    generated = rngN6DieArr(dies: Int(dies))
                    displayDies = generated
                    displayMultiDieMode = multiDieMode
                    result = arrCombine(arr: generated, combineMode: multiDieMode)
                    resultDescription = describeResult(inp: displayDies, combineMode: multiDieMode)
                }
                HStack {
                    Spacer()
                    Text(String(result))
                        .bold()
                        .font(.largeTitle)
                    Spacer()
                }
                Text(resultDescription)
            }
            .listRowSpacing(5)
        }
    }
}

func describeResult(inp: [Int], combineMode: String) -> String {
    let len = inp.count-1
    var result = ""
    var symbol = ""
    if inp.isEmpty {
        return "0"
    } else {
        if combineMode == "plus" {
            symbol = " + "
        } else if combineMode == "multiply" {
            symbol = " x "
        }
        for i in 0...len {
            if i == len {
                result += String(inp[i])
            } else {
                result += String(inp[i]) + symbol
            }
        }
        result += " = " + String(arrCombine(arr: inp, combineMode: combineMode))
        return result
    }
}

#Preview {
    DiceView()
}