//
//  KeysSection.swift
//  OTP
//
//  Created by Shadowfacts on 8/24/21.
//

import SwiftUI
import UniformTypeIdentifiers

struct KeysSection: View {
    @ObservedObject private var store: KeyStore = .shared
    @ObservedObject private var entryHolder: AppView.CodeHolder
    @State private var editedEntry: AppView.CodeEntry? = nil
    @State private var presentedQRCode: AppView.CodeEntry? = nil
    
    init(codeHolder: AppView.CodeHolder) {
        self.entryHolder = codeHolder
    }
    
    var body: some View {
        Section {
            ForEach(entryHolder.sortedEntries) { (entry) in
                KeyView(key: entry.key, currentCode: entry.code)
                // disabled because dropping onto list rows does not work :/
//                    .onDrag {
//                        NSItemProvider(object: entry.id.uuidString as NSString)
//                    }
                    .contextMenu {
                        self.keyMenu(entry: entry)
                    }
            }
            .onDelete { (indices) in
                withAnimation(.default) {
                    for index in indices {
                        store.removeKey(entryID: entryHolder.sortedEntries[index].id)
                    }
                }
            }
        }
        .sheet(item: $editedEntry, content: self.editFormSheet)
        .sheet(item: $presentedQRCode, content: self.qrCodeSheet)
    }
    
    @ViewBuilder
    private func keyMenu(entry: AppView.CodeEntry) -> some View {
        Section {
            Menu {
                Button("No Folder") {
                    withAnimation {
                        store.moveEntryToFolder(entryID: entry.id, folderID: nil)
                    }
                }
                .disabled(entry.entry.folderID == nil)
                
                Section {
                    ForEach(store.sortedFolders) { (folder) in
                        Button {
                            withAnimation {
                                store.moveEntryToFolder(entryID: entry.id, folderID: folder.id)
                            }
                        } label: {
                            Text(folder.name)
                        }
                        .disabled(entry.entry.folderID == folder.id)
                    }
                }
            } label: {
                Label("Move to Folder", systemImage: "folder")
            }
            
            Button {
                // even the .contextMenu closure is called again, SwiftUI seems not to update the actual context menu buttons
                // so when this closure is called, it's copy of entry may be stale if the entry's since been edited
                // so we lookup the known current one by ID and edit that
                let realEntry = entryHolder.entries.first { $0.id == entry.id }
                editedEntry = realEntry
            } label: {
                Label("Edit Key", systemImage: "pencil")
            }
            
            // todo: can't mark menu as destructive
            Menu {
                Button("Cancel", role: .cancel) {}
                
                Button("Delete Key", role: .destructive) {
                    // todo: why doesn't this animation work?
                    withAnimation(.default) {
                        store.removeKey(entryID: entry.id)
                    }
                }
            } label: {
                Label("Delete Key", systemImage: "trash")
            }
        }
        
        Section {
            Button {
                let realEntry = entryHolder.entries.first { $0.id == entry.id }
                presentedQRCode = realEntry
            } label: {
                Label("Export as QR", systemImage: "qrcode")
            }
            
            Button {
                UIPasteboard.general.url = entry.key.url
            } label: {
                Label("Copy as URL", systemImage: "link")
            }
        }
    }
    
    private func editFormSheet(editedEntry: AppView.CodeEntry) -> some View {
        NavigationView {
            EditKeyForm(editingKey: editedEntry.key) { (action) in
                self.editedEntry = nil
                switch action {
                case .cancel:
                    break
                case .save(let key):
                    store.updateKey(entryID: editedEntry.id, newKey: key)
                }
            }
            .navigationTitle("Edit Key")
        }
    }
    
    private func qrCodeSheet(entry: AppView.CodeEntry) -> some View {
        NavigationView {
            QRCodeView(key: entry.key)
                .id(entry.id)
        }
    }
    
}

struct KeysSection_Previews: PreviewProvider {
    static var previews: some View {
        KeysSection(codeHolder: .init(store: .shared))
    }
}