stats view
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@ -22,6 +22,10 @@ struct MainTabView: View {
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.tabItem {
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Label("Maintenance", systemImage: "wrench.fill")
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}
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StatsView()
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.tabItem {
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Label("Stats", systemImage: "chart.bar.fill")
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}
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}
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}
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}
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@ -0,0 +1,234 @@
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//
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// StatsView.swift
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// Gas Man
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//
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// Created by Kameron Kenny on 3/19/25.
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//
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import SwiftUI
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import CoreData
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struct StatsView: View {
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@Environment(\.managedObjectContext) private var viewContext
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// Fetch all fuel logs sorted by date (descending)
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@FetchRequest(
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sortDescriptors: [NSSortDescriptor(keyPath: \FuelLog.date, ascending: false)],
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animation: .default)
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private var fuelLogs: FetchedResults<FuelLog>
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// Fetch all vehicles sorted by make (or any preferred order)
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@FetchRequest(
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sortDescriptors: [NSSortDescriptor(keyPath: \Vehicle.make, ascending: true)],
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animation: .default)
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private var vehicles: FetchedResults<Vehicle>
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@State private var selectedVehicleID: UUID? = nil
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// Filter fuel logs by the selected vehicle.
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private var filteredFuelLogs: [FuelLog] {
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if let vehicleID = selectedVehicleID {
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return fuelLogs.filter { log in
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log.vehicle?.id == vehicleID
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}
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} else {
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return Array(fuelLogs)
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}
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}
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// Total number of fill-ups.
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private var fillUpCount: Int {
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filteredFuelLogs.count
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}
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// Average MPG computed only for full-tank logs.
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private var averageMPG: Double? {
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let logs = filteredFuelLogs
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guard logs.count > 1 else { return nil }
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var mpgValues: [Double] = []
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for i in 0..<logs.count - 1 {
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let current = logs[i]
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let next = logs[i + 1]
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if current.fullTank, current.fuelVolume > 0, current.odometer > next.odometer {
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let mpg = (current.odometer - next.odometer) / current.fuelVolume
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mpgValues.append(mpg)
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}
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}
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guard !mpgValues.isEmpty else { return nil }
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let sum = mpgValues.reduce(0, +)
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return sum / Double(mpgValues.count)
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}
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// Price per gallon stats: lowest, highest, average.
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private var pricePerGallonStats: (min: Double?, max: Double?, avg: Double?) {
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let prices = filteredFuelLogs.map { $0.pricePerGalon }
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guard !prices.isEmpty else { return (nil, nil, nil) }
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let minPrice = prices.min()
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let maxPrice = prices.max()
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let avgPrice = prices.reduce(0, +) / Double(prices.count)
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return (minPrice, maxPrice, avgPrice)
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}
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// Distance between fill-ups stats: lowest, highest, average.
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private var distanceStats: (min: Double?, max: Double?, avg: Double?) {
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let logs = filteredFuelLogs
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guard logs.count > 1 else { return (nil, nil, nil) }
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var distances: [Double] = []
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for i in 0..<logs.count - 1 {
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let current = logs[i]
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let next = logs[i + 1]
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let dist = current.odometer - next.odometer
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if dist > 0 {
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distances.append(dist)
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}
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}
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guard !distances.isEmpty else { return (nil, nil, nil) }
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let minDistance = distances.min()!
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let maxDistance = distances.max()!
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let avgDistance = distances.reduce(0, +) / Double(distances.count)
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return (minDistance, maxDistance, avgDistance)
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}
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// Gallons per fill-up stats.
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private var gallonsStats: (min: Double?, max: Double?, avg: Double?) {
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let gallons = filteredFuelLogs.map { $0.fuelVolume }
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guard !gallons.isEmpty else { return (nil, nil, nil) }
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let minGallons = gallons.min()
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let maxGallons = gallons.max()
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let avgGallons = gallons.reduce(0, +) / Double(gallons.count)
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return (minGallons, maxGallons, avgGallons)
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}
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var body: some View {
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NavigationView {
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Form {
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// Vehicle Selector
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Section(header: Text("Select Vehicle")) {
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Picker("Vehicle", selection: $selectedVehicleID) {
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ForEach(vehicles, id: \.id) { vehicle in
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Text("\(vehicle.year ?? "") \(vehicle.make ?? "") \(vehicle.model ?? "")")
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.tag(vehicle.id)
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}
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}
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.pickerStyle(MenuPickerStyle())
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}
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// Stats for Fuel Logs
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Section(header: Text("Fill-Up Count")) {
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Text("\(fillUpCount)")
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}
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Section(header: Text("Average MPG")) {
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if let avgMPG = averageMPG {
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Text("\(avgMPG, specifier: "%.1f") MPG")
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} else {
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Text("N/A")
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.foregroundColor(.secondary)
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}
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}
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Section(header: Text("Price per Gallon")) {
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let stats = pricePerGallonStats
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HStack {
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Text("Lowest:")
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Spacer()
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if let minPrice = stats.min {
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Text("$\(minPrice, specifier: "%.3f")")
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} else {
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Text("N/A")
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}
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}
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HStack {
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Text("Highest:")
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Spacer()
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if let maxPrice = stats.max {
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Text("$\(maxPrice, specifier: "%.3f")")
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} else {
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Text("N/A")
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}
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}
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HStack {
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Text("Average:")
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Spacer()
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if let avgPrice = stats.avg {
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Text("$\(avgPrice, specifier: "%.3f")")
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} else {
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Text("N/A")
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}
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}
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}
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// Distance Between Fill-Ups Stats
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Section(header: Text("Distance Between Fill-Ups")) {
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let dStats = distanceStats
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HStack {
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Text("Lowest:")
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Spacer()
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if let minDistance = dStats.min {
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Text("\(minDistance, specifier: "%.0f") miles")
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} else {
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Text("N/A")
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}
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}
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HStack {
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Text("Highest:")
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Spacer()
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if let maxDistance = dStats.max {
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Text("\(maxDistance, specifier: "%.0f") miles")
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} else {
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Text("N/A")
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}
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}
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HStack {
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Text("Average:")
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Spacer()
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if let avgDistance = dStats.avg {
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Text("\(avgDistance, specifier: "%.0f") miles")
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} else {
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Text("N/A")
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}
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}
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}
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Section(header: Text("Gallons per Fill-Up")) {
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let gStats = gallonsStats
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HStack {
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Text("Lowest:")
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Spacer()
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if let minGallons = gStats.min {
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Text("\(minGallons, specifier: "%.3f") gallons")
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} else {
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Text("N/A")
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}
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}
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HStack {
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Text("Highest:")
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Spacer()
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if let maxGallons = gStats.max {
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Text("\(maxGallons, specifier: "%.3f") gallons")
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} else {
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Text("N/A")
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}
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}
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HStack {
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Text("Average:")
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Spacer()
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if let avgGallons = gStats.avg {
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Text("\(avgGallons, specifier: "%.3f") gallons")
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} else {
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Text("N/A")
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}
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}
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}
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}
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.navigationTitle("Stats")
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}
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.onAppear {
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if selectedVehicleID == nil {
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selectedVehicleID = vehicles.first?.id
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}
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}
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}
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}
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