//
//  RecipeEditView.swift
//  Nextcloud Cookbook iOS Client
//
//  Created by Vincent Meilinger on 29.09.23.
//

import Foundation
import SwiftUI
import PhotosUI



struct RecipeEditView: View {
    @ObservedObject var viewModel: RecipeEditViewModel    
    
    var body: some View {
        NavigationStack {
            VStack {
                HStack {
                    Button() {
                        viewModel.isPresented.wrappedValue = false
                    } label: {
                        Text("Cancel")
                            .bold()
                    }
                    if !viewModel.uploadNew {
                        Menu {
                            Button {
                                print("Delete recipe.")
                                viewModel.alertType = RecipeCreationError.CONFIRM_DELETE
                                viewModel.alertAction = viewModel.deleteRecipe
                                viewModel.presentAlert = true
                            } label: {
                                Image(systemName: "trash")
                                    .foregroundStyle(.red)
                                Text("Delete recipe")
                                    .foregroundStyle(.red)
                            }
                        } label: {
                            Image(systemName: "ellipsis.circle")
                                .font(.title3)
                                .padding()
                        }
                    }
                    Spacer()
                    Button() {
                        if viewModel.uploadNew {
                            viewModel.uploadNewRecipe()
                        } else {
                            viewModel.uploadEditedRecipe()
                        }
                    } label: {
                        Text("Upload")
                            .bold()
                    }
                }.padding()
                HStack {
                    Text(viewModel.recipe.name == "" ? LocalizedStringKey("New recipe") : LocalizedStringKey(viewModel.recipe.name))
                        .font(.title)
                        .bold()
                        .padding()
                    Spacer()
                }
                Form {
                    if viewModel.showImportSection {
                        Section {
                            TextField(LocalizedStringKey("URL (e.g. example.com/recipe)"), text: $viewModel.importURL)
                            Button {
                                viewModel.importRecipe()
                            } label: {
                                Text(LocalizedStringKey("Import"))
                            }
                        } header: {
                            Text(LocalizedStringKey("Import Recipe"))
                        } footer: {
                            Text(LocalizedStringKey("Paste the url of a recipe you would like to import in the above, and we will try to fill in the fields for you. This feature does not work with every website. If your favourite website is not supported, feel free to reach out for help. You can find the contact details in the app settings."))
                        }
                        
                    } else {
                        Section {
                            Button() {
                                withAnimation{
                                    viewModel.showImportSection = true
                                }
                            } label: {
                                Text("Import recipe from a website")
                            }
                        }
                    }
                    
                    TextField("Title", text: $viewModel.recipe.name)
                    Section {
                        TextEditor(text: $viewModel.recipe.description)
                    } header: {
                        Text("Description")
                    }
                    
                    Section() {
                        NavigationLink(viewModel.recipe.recipeCategory == "" ? "Category" : "Category: \(viewModel.recipe.recipeCategory)") {
                            CategoryPickerView(
                                title: "Category",
                                searchSuggestions: viewModel.mainViewModel.categories.map({ category in
                                    category.name == "*" ? "Other" : category.name
                                }),
                                selection: $viewModel.recipe.recipeCategory)
                        }
                        NavigationLink("Keywords") {
                            KeywordPickerView(
                                title: "Keywords",
                                searchSuggestions: viewModel.keywordSuggestions,
                                selection: $viewModel.keywords
                            )
                        }
                    } footer: {
                        ScrollView(.horizontal, showsIndicators: false) {
                            HStack {
                                ForEach(viewModel.keywords, id: \.self) { keyword in
                                    Text(keyword)
                                }
                            }
                        }
                    }
                    
                    Section() {
                        Picker("Servings:", selection: $viewModel.recipe.recipeYield) {
                            ForEach(0..<99, id: \.self) { i in
                                Text("\(i)").tag(i)
                            }
                        }
                        .pickerStyle(.menu)
                        DurationPicker(title: LocalizedStringKey("Preparation duration:"), duration: viewModel.prepDuration)
                        DurationPicker(title: LocalizedStringKey("Cooking duration:"), duration: viewModel.cookDuration)
                        DurationPicker(title: LocalizedStringKey("Total duration:"), duration: viewModel.totalDuration)
                    }
                    
                    EditableListSection(title: LocalizedStringKey("Ingredients"), items: $viewModel.recipe.recipeIngredient)
                    EditableListSection(title: LocalizedStringKey("Tools"), items: $viewModel.recipe.tool)
                    EditableListSection(title: LocalizedStringKey("Instructions"), items: $viewModel.recipe.recipeInstructions)
                }
            }
        }
        .task {
            viewModel.keywordSuggestions = await viewModel.mainViewModel.getKeywords()
        }
        .onAppear {
            viewModel.prepareView()
        }
        .alert(viewModel.alertType.localizedTitle, isPresented: $viewModel.presentAlert) {
            ForEach(viewModel.alertType.alertButtons) { buttonType in
                if buttonType == .OK {
                    Button(AlertButton.OK.rawValue, role: .cancel) {
                        viewModel.alertAction()
                    }
                } else if buttonType == .CANCEL {
                    Button(AlertButton.CANCEL.rawValue, role: .cancel) { }
                } else if buttonType == .DELETE {
                    Button(AlertButton.DELETE.rawValue, role: .destructive) {
                        viewModel.alertAction()
                    }
                }
            }
        } message: {
            Text(viewModel.alertType.localizedDescription)
        }
    }
}



fileprivate struct EditableListSection: View {
    @State var title: LocalizedStringKey
    @Binding var items: [String]
        
    var body: some View {
        Section() {
            List {
                ForEach(items.indices, id: \.self) { ix in
                    HStack(alignment: .top) {
                        Text("\(ix+1).")
                            .padding(.vertical, 10)
                        TextEditor(text: $items[ix])
                            .multilineTextAlignment(.leading)
                            .textFieldStyle(.plain)
                            .padding(.vertical, 1)
                    }
                }
                .onMove { indexSet, offset in
                    items.move(fromOffsets: indexSet, toOffset: offset)
                }
                .onDelete { indexSet in
                    items.remove(atOffsets: indexSet)
                }
            }
            
            HStack {
                Spacer()
                Text("Add")
                Button() {
                    items.append("")
                } label: {
                    Image(systemName: "plus.circle.fill")
                }
            }
        } header: {
            HStack {
                Text(title)
                Spacer()
                EditButton()
            }
        }
    }
}


fileprivate struct DurationPicker: View {
    @State var title: LocalizedStringKey
    @ObservedObject var duration: DurationComponents

    var body: some View {
        HStack {
            Text(title)
            Spacer()
            TextField("00", text: $duration.hourComponent)
                .keyboardType(.decimalPad)
                .textFieldStyle(.roundedBorder)
                .multilineTextAlignment(.trailing)
                .frame(maxWidth: 40)
            Text(":")
            TextField("00", text: $duration.minuteComponent)
                .keyboardType(.decimalPad)
                .textFieldStyle(.roundedBorder)
                .frame(maxWidth: 40)
        }
        .frame(maxHeight: 40)
        .clipped()
    }
}