/*
See the LICENSE.txt file for this sample’s licensing information.

Abstract:
A SwiftUI view that shows a scrollable full-size image.
*/

import SwiftUI
import CoreData
import CloudKit


struct FullImageView: View {
    @Binding var activeSheet: ActiveSheet?
    var photo: Photo

    private let fetchRequest: FetchRequest
    private var ratings: FetchedResults {
        return fetchRequest.wrappedValue
    }

    init(activeSheet: Binding, photo: Photo) {
        self._activeSheet = activeSheet
        self.photo = photo
        
        let nsFetchRequest = Rating.fetchRequest()
        nsFetchRequest.sortDescriptors = [NSSortDescriptor(keyPath: \Rating.value, ascending: true)]
        nsFetchRequest.predicate = NSPredicate(format: "photo = %@", photo)
        fetchRequest = FetchRequest(fetchRequest: nsFetchRequest, animation: .default)
    }
    
    private var photoImage: UIImage? {
        let photoData = photo.photoData?.data
        return photoData != nil ? UIImage(data: photoData!) : nil
    }
    
    var body: some View {
        NavigationStack {
            HStack (alignment: .top) {
                VStack (alignment: .leading){
                    if let share = PersistenceController.shared.existingShare(photo: photo) {
                        ScrollView(.horizontal) {
                            VStack (alignment: .leading) {
                                Text("A share exists: \(share.title)")
                                Text("ckName = \(photo.ckRecordName ?? "")")
                                    .font(.footnote)
                                if let ckZoneR = photo.ckRecordZoneNameReverse {
                                    if ckZoneR == "zone.cloudkit.coredata.apple.com" {
                                        Text("ckZoneR = \(ckZoneR)")
                                            .font(.footnote)
                                            .foregroundColor(.gray)
                                    } else {
                                        Text("ckZoneR = \(ckZoneR)")
                                            .font(.footnote)
                                            .foregroundColor(.green)
                                    }
                                } else {
                                    Text("ckZoneR = ")
                                        .font(.footnote)
                                        .foregroundColor(.red)
                                }
                            }
                        }
                    } else {
                        Text("NO share exists")
                    }
                    if let image = photoImage {
                        Image(uiImage: image)
                            .resizable()
                            .frame(width: 150, height: 150)
                    } else {
                        Text("The full size image is probably not downloaded from CloudKit.").padding()
                    }
                    Button(action: {
                        addRandomRating()
                    }) {
                        Text("ADD a random ratings")
                            .foregroundColor(.accentColor)
                    }
                    Button(action: {
                        addRandomRatingQueue()
                    }) {
                        Text("ADD a random ratings Queued")
                            .foregroundColor(.accentColor)
                    }
                    Button(action: {
                        addRandomRatingWaitingQueue()
                    }) {
                        Text("ADD a random ratings Waiting + Queued")
                            .foregroundColor(.accentColor)
                    }
                    ScrollView(.horizontal) {
                        VStack(alignment:.leading) {
                            Text("Ratings (#=\(ratings.count)):")
                            ForEach(Array(ratings.enumerated()), id: \.element) { index, rating in
                                if let ckZoneR = rating.ckRecordZoneNameReverse {
                                    if ckZoneR == "zone.cloudkit.coredata.apple.com" {
                                        HStack {
                                            Text("\(rating.value): ckZoneR =")
                                                .font(.footnote)
                                            Text("\(ckZoneR)")
                                                .font(.footnote)
                                            Text(" ;ckName = \(rating.ckRecordName ?? "")")
                                                .font(.footnote)
                                        }
                                    } else {
                                        HStack {
                                            Text("\(rating.value): ckZoneR =")
                                                .font(.footnote)
                                            Text("\(ckZoneR)")
                                                .font(.footnote)
                                                .foregroundColor(.green)
                                            Text("; ckName = \(rating.ckRecordName ?? "")")
                                                .font(.footnote)
                                        }
                                    }
                                } else {
                                    HStack {
                                        Text("\(rating.value): ckZoneR =")
                                            .font(.footnote)
                                        Text("")
                                            .font(.footnote)
                                            .foregroundColor(.red)
                                        Text("; ckName = \(rating.ckRecordName ?? "")")
                                            .font(.footnote)
                                    }
                                }
                            }
                        }
                    }
                }
                Spacer()
            }
            .toolbar {
                ToolbarItem(placement: .dismiss) {
                    Button("Dismiss") {
                        activeSheet = nil
                    }
                }
            }
            .listStyle(.plain)
            .navigationTitle("Full Size Photo")
            Spacer()
        }
        .frame(idealWidth: Layout.sheetIdealWidth, idealHeight: Layout.sheetIdealHeight)
    }
    
    private func addRandomRatingWaitingQueue() {
        let ratingValue = Int16.random(in: 1...5)
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
            withAnimation {
                PersistenceController.shared.addRating(value: Int16(ratingValue), relateTo: photo)
            }
        }
    }
    
    private func addRandomRatingQueue() {
        let ratingValue = Int16.random(in: 1...5)
        DispatchQueue.main.async {
            withAnimation {
                PersistenceController.shared.addRating(value: Int16(ratingValue), relateTo: photo)
            }
        }
    }

    private func addRandomRating() {
        withAnimation {
            let ratingValue = Int16.random(in: 1...5)
            PersistenceController.shared.addRating(value: ratingValue, relateTo: photo)
        }
    }
    
}

extension NSManagedObject {
    
    var ckRecordName: String? {
        let returnValue = PersistenceController.shared.persistentContainer.recordID(for: self.objectID)?.recordName
        
#if DEBUG
        print("\(#function) @ NSManagedObject-extension: \(returnValue ?? "nil")")
#endif
        return returnValue
    }
    
    var ckRecordZoneNameReverse: String? {
        let returnValue =  PersistenceController.shared.persistentContainer.recordID(for: self.objectID)?.zoneID.zoneName
        if let inputString = returnValue {
            let reversedString = inputString.split(separator: ".").reversed().joined(separator: ".")
#if DEBUG
            print("\(#function) @ NSManagedObject-extension: \(reversedString)")
#endif
            return reversedString
        }
#if DEBUG
        print("\(#function) @ NSManagedObject-extension: nil")
#endif
        return nil
    }
    
    
}