//
//  ContentView.swift
//  Chellenge1-Converto
//
//  Created by Mohamed Abdelhak on 19.02.21.
//

import SwiftUI

struct ContentView: View {

    @State private var value = ""
    @State private var unitIn = 0
    @State private var unitOut = 0

    let units = ["seconds", "minutes", "hours"]
    let unitsDuration: [UnitDuration] = [.seconds, .minutes, .hours]

    var result: Double {

        let userValue = Double(value) ?? 0
        let unitToConvert = Measurement.init(value: userValue, unit: unitsDuration[unitIn])
        let unitIsConverted = unitToConvert.converted(to: unitsDuration[unitOut])
        return unitIsConverted.value

    }

    var body: some View {
        NavigationView {
            Form {
                Section {

                    TextField("Enter value", text: $value)
                        .font(.largeTitle)
                        .keyboardType(.decimalPad)
                        .padding(.all)
                    Picker("Unit", selection: $unitIn) {
                        ForEach(0 ..< units.count) {
                            Text("\(units[$0])")
                        }
                    }
                    .pickerStyle(SegmentedPickerStyle())
                }

                Section {
                    HStack {
                        Spacer()
                        Text("=")
                            .font(.largeTitle)
                            .fontWeight(.medium)
                        Spacer()
                    }
                }

                Section {
                    Picker("Unit", selection: $unitOut) {
                        ForEach(0 ..< units.count) {
                            Text("\(units[$0])")
                        }
                    }
                    .pickerStyle(SegmentedPickerStyle())
                    Text("\(result, specifier: "%.2f") \(units[unitOut])")
                        .font(.largeTitle)
                        .keyboardType(.decimalPad)
                        .padding(/*@START_MENU_TOKEN@*/.all/*@END_MENU_TOKEN@*/)
                }

            }
        }
    }

    struct ContentView_Previews: PreviewProvider {
        static var previews: some View {
            ContentView()
        }
    }
}

https://monosnap.com/file/mppAi1T9OD5kVoEq3bpRY1GdX2SB8D