//
//  CreateWorkoutView.swift
//  Werkout_ios
//
//  Created by Trey Tartt on 6/15/23.
//

import SwiftUI

struct CreateWorkoutMainView: View {
    @StateObject var viewModel = WorkoutViewModel()
    @State var selectedCreateWorkoutSuperSet: CreateWorkoutSuperSet?
    @State private var showAddExercise = false

    private var canSubmit: Bool {
        viewModel.title.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty == false &&
        viewModel.isUploading == false
    }

    var body: some View {
        VStack(spacing: 0) {
            VStack(spacing: WerkoutTheme.sm) {
                TextField("Title", text: $viewModel.title)
                    .werkoutTextField()
                    .padding(.horizontal, WerkoutTheme.md)

                TextField("Description", text: $viewModel.description)
                    .werkoutTextField()
                    .padding(.horizontal, WerkoutTheme.md)
            }
            .padding(.vertical, WerkoutTheme.md)
            .background(WerkoutTheme.surfaceCard)

            ScrollViewReader { proxy in
                List() {
                    ForEach(viewModel.superSets) { superset in
                        CreateWorkoutSupersetView(
                            selectedCreateWorkoutSuperSet: $selectedCreateWorkoutSuperSet,
                            showAddExercise: $showAddExercise,
                            superset: superset,
                            viewModel: viewModel)
                    }
                    .listRowBackground(WerkoutTheme.surfaceCard)
                    // after adding new exercise we have to scroll to the bottom
                    // where the new exercise is sooo keep this so we can scroll
                    // to id 999
                    Color.clear
                        .frame(height: 1)
                        .accessibilityHidden(true)
                        .id(999)
                        .listRowSeparator(.hidden)
                        .listRowBackground(Color.clear)
                }
                .scrollContentBackground(.hidden)
                .background(WerkoutTheme.background)
                .onChange(of: viewModel.randomValueForUpdatingValue) { _, _ in
                    withAnimation {
                        proxy.scrollTo(999, anchor: .bottom)
                    }
                }
            }
            .sheet(isPresented: $showAddExercise) {
                AddExerciseView(selectedExercise: { exercise in
                    if let superset = selectedCreateWorkoutSuperSet {
                        viewModel.addExercise(exercise, to: superset)
                    }
                    selectedCreateWorkoutSuperSet = nil
                })
            }

            Divider()
                .overlay(WerkoutTheme.divider)

            GlassEffectContainer {
                HStack(spacing: WerkoutTheme.md) {
                    Button(action: {
                        viewModel.addNewSuperset()
                    }) {
                        Label("Add Superset", systemImage: "plus.circle.fill")
                            .font(.system(size: 15, weight: .bold))
                            .foregroundStyle(WerkoutTheme.textPrimary)
                            .frame(maxWidth: .infinity)
                            .frame(height: 44)
                    }
                    .glassEffect(.regular.interactive())
                    .tint(WerkoutTheme.accent)
                    .accessibilityLabel("Add superset")
                    .accessibilityHint("Adds a new superset section to this workout")

                    Button(action: {
                        viewModel.uploadWorkout()
                    }, label: {
                        if viewModel.isUploading {
                            ProgressView()
                                .progressViewStyle(.circular)
                                .tint(WerkoutTheme.textPrimary)
                        } else {
                            Text("Done")
                                .font(.system(size: 15, weight: .bold))
                                .foregroundStyle(WerkoutTheme.textPrimary)
                        }
                    })
                    .frame(maxWidth: .infinity)
                    .frame(height: 44)
                    .glassEffect(.regular.interactive())
                    .tint(WerkoutTheme.success)
                    .disabled(canSubmit == false)
                    .accessibilityLabel("Upload workout")
                    .accessibilityHint("Uploads this workout to your account")
                }
                .padding(.horizontal, WerkoutTheme.md)
                .padding(.vertical, WerkoutTheme.sm)
            }
        }
        .background(WerkoutTheme.background)
        .alert("Create Workout", isPresented: Binding<Bool>(
            get: { viewModel.validationError != nil },
            set: { _ in viewModel.validationError = nil }
        )) {
            Button("OK", role: .cancel) {}
        } message: {
            Text(viewModel.validationError ?? "")
        }
    }
}

//struct CreateWorkoutView_Previews: PreviewProvider {
//    static var previews: some View {
//        CreateWorkoutView()
//    }
//}