//
//  VehicleDetailView.swift
//  Gas Man
//
//  Created by Kameron Kenny on 3/18/25.
//
import SwiftUI

struct VehicleDetailView: View {
    @ObservedObject var vehicle: Vehicle
    @State private var showingEditVehicle = false

    // Image state for the vehicle photo.
    @State private var vehicleImage: Image? = nil
    @State private var inputImage: UIImage? = nil
    @State private var showImagePicker = false
    @State private var imagePickerSource: UIImagePickerController.SourceType = .photoLibrary
    @State private var showImageSourceOptions = false

    private let dateFormatter: DateFormatter = {
         let formatter = DateFormatter()
         formatter.dateStyle = .short
         return formatter
    }()
    
    var body: some View {
        Form {
            // Photo Section at the very top
            Section {
                ZStack {
                    if let vehicleImage = vehicleImage {
                        vehicleImage
                            .resizable()
                            .scaledToFill()
                    } else {
                        Rectangle()
                            .fill(Color.gray.opacity(0.2))
                        Image(systemName: "camera.fill")
                            .font(.largeTitle)
                            .foregroundColor(.gray)
                    }
                }
                .frame(height: 200)
                .clipped()
                .onTapGesture {
                    showImageSourceOptions = true
                }
                .confirmationDialog("Select Photo Source", isPresented: $showImageSourceOptions) {
                    if UIImagePickerController.isSourceTypeAvailable(.camera) {
                        Button("Camera") {
                            imagePickerSource = .camera
                            showImagePicker = true
                        }
                    }
                    Button("Photo Library") {
                        imagePickerSource = .photoLibrary
                        showImagePicker = true
                    }
                    Button("Cancel", role: .cancel) { }
                }
                .sheet(isPresented: $showImagePicker, onDismiss: loadImage) {
                    ImagePicker(sourceType: imagePickerSource, image: $inputImage)
                }
            }
            
            // Rest of the details...
            Section(header: Text("Basic Information")) {
                HStack {
                    Text("Vehicle Type:")
                    Spacer()
                    Text(vehicle.vehicleType ?? "")
                }
                HStack {
                    Text("Year:")
                    Spacer()
                    Text(vehicle.year ?? "")
                }
                HStack {
                    Text("Make:")
                    Spacer()
                    Text(vehicle.make ?? "N/A")
                }
                HStack {
                    Text("Model:")
                    Spacer()
                    Text(vehicle.model ?? "N/A")
                }
                HStack {
                    Text("Color:")
                    Spacer()
                    Text(vehicle.color ?? "N/A")
                }
            }
            Section(header: Text("Purchase Information")) {
                HStack {
                    Text("Date:")
                    Spacer()
                    Text(vehicle.purchaseDate != nil ? dateFormatter.string(from: vehicle.purchaseDate!) : "")
                }
                HStack {
                    Text("Price:")
                    Spacer()
                    if let price = vehicle.purchasePrice {
                        Text("$\(price.doubleValue, specifier: "%.2f")")
                    } else {
                        Text("")
                    }
                }
                HStack {
                    Text("Odometer:")
                    Spacer()
                    if let odo = vehicle.odometerAtPurchase {
                        Text("\(odo.doubleValue, specifier: "%.0f") miles")
                    } else {
                        Text("")
                    }
                }
            }
            Section(header: Text("Engine & Transmission")) {
                HStack {
                    Text("Engine Name:")
                    Spacer()
                    Text(vehicle.engineName ?? "")
                }
                HStack {
                    Text("Engine Displacement:")
                    Spacer()
                    if let ed = vehicle.engineDisplacement {
                        Text("\(ed.doubleValue, specifier: "%.3f") L")
                    } else {
                        Text("")
                    }
                }
                HStack {
                    Text("Transmission:")
                    Spacer()
                    Text(vehicle.transmission ?? "Automatic")
                }
            }
            Section(header: Text("Tires")) {
                HStack {
                    Text("Brand:")
                    Spacer()
                    Text(vehicle.tireBrand ?? "")
                }
                HStack {
                    Text("Model:")
                    Spacer()
                    Text(vehicle.tireModel ?? "")
                }
                HStack {
                    Text("Size:")
                    Spacer()
                    if let tw = vehicle.tireSizeWidth {
                        Text("\(tw.doubleValue, specifier: "%.0f")")
                    } else {
                        Text("-")
                    }
                    Text("/")
                    if let th = vehicle.tireSizeHeight {
                        Text("\(th.doubleValue, specifier: "%.0f")")
                    } else {
                        Text("-")
                    }
                    Text("r")
                    if let tr = vehicle.tireSizeRadius {
                        Text("\(tr.doubleValue, specifier: "%.0f")")
                    } else {
                        Text("-")
                    }
                }
            }
            Section(header: Text("Wheels")) {
                HStack {
                    Text("Brand:")
                    Spacer()
                    Text(vehicle.wheelBrand ?? "")
                }
                HStack {
                    Text("Model:")
                    Spacer()
                    Text(vehicle.wheelModel ?? "")
                }
                HStack {
                    Text("Size:")
                    Spacer()
                    if let wd = vehicle.wheelSizeDiameter {
                        Text("\(wd.doubleValue, specifier: "%.3f")")
                    } else {
                        Text("-")
                    }
                    Text(" x ")
                    if let ws = vehicle.wheelSizeWidth {
                        Text("\(ws.doubleValue, specifier: "%.3f")")
                    } else {
                        Text("-")
                    }
                }
            }
            if vehicle.soldDate != nil {
                Section(header: Text("Sale Information")) {
                    HStack {
                        Text("Date Sold:")
                        Spacer()
                        Text(vehicle.soldDate != nil ? dateFormatter.string(from: vehicle.soldDate!) : "")
                    }
                    HStack {
                        Text("Odometer at Sale:")
                        Spacer()
                        if let odo = vehicle.odometerAtSale {
                            Text("\(odo.doubleValue, specifier: "%.0f") miles")
                        } else {
                            Text("")
                        }
                    }
                }
            }
            Section(header: Text("Notes")) {
                Text(vehicle.notes ?? "")
            }
        }
        .navigationTitle("\(vehicle.make ?? "") \(vehicle.model ?? "")")
        .toolbar {
            ToolbarItem(placement: .navigationBarTrailing) {
                Button("Edit") {
                    showingEditVehicle = true
                }
            }
        }
        .sheet(isPresented: $showingEditVehicle) {
            EditVehicleView(vehicle: vehicle)
                .environment(\.managedObjectContext, vehicle.managedObjectContext!)
        }
        .onAppear {
            if let data = vehicle.photo, let uiImage = UIImage(data: data) {
                vehicleImage = Image(uiImage: uiImage)
            }
        }
    }
    
    // This function is called when the image picker is dismissed.
    func loadImage() {
        guard let inputImage = inputImage else { return }
        vehicleImage = Image(uiImage: inputImage)
        // Save the image to the vehicle.
        if let imageData = inputImage.jpegData(compressionQuality: 0.8) {
            vehicle.photo = imageData
            try? vehicle.managedObjectContext?.save()
        }
    }
}