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

import Foundation
import SwiftUI

enum MainViewTypes: Int, CaseIterable {
    case AllWorkout = 0
    case MyWorkouts
    
    var title: String {
        switch self {
            
        case .AllWorkout:
            return "All Workouts"
        case .MyWorkouts:
            return "Planned Workouts"
        }
    }
}

struct AllWorkoutsView: View {
  
    @State var isUpdating = false
    @State var workouts: [Workout]?
    var bridgeModule = BridgeModule.shared
    @State public var needsUpdating: Bool = true
 
    @ObservedObject var dataStore = DataStore.shared
    
    @State private var showWorkoutDetail = false
    @State private var selectedWorkout: Workout? {
        didSet {
            bridgeModule.currentWorkout = selectedWorkout
        }
    }
    
    @State private var selectedPlannedWorkout: Workout? {
        didSet {
            bridgeModule.currentWorkout = selectedPlannedWorkout
        }
    }
    
    @State private var showLoginView = false
    @State private var selectedSegment: MainViewTypes = .AllWorkout
    @State var selectedDate: Date = Date()
    
    let pub = NotificationCenter.default.publisher(for: NSNotification.Name("CreatedNewWorkout"))

    var body: some View {
        ZStack {
            if let workouts = workouts {
                VStack {
                    AllWorkoutPickerView(mainViews: MainViewTypes.allCases,
                                         selectedSegment: $selectedSegment,
                                         showCurrentWorkout: {
                        selectedWorkout = bridgeModule.currentWorkout
                    })
                    
                    switch selectedSegment {
                    case .AllWorkout:
                        if isUpdating {
                            ProgressView()
                                .progressViewStyle(.circular)
                        }
                        
                        AllWorkoutsListView(workouts: workouts, selectedWorkout: { workout in
                            selectedWorkout = workout
                        }, refresh: {
                            self.needsUpdating = true
                            maybeUpdateShit()
                        })
                        Divider()
                    case .MyWorkouts:
                        plannedWorkout(workouts: UserStore.shared.plannedWorkouts)
                    }
                }
            } else {
                ProgressView()
                    .progressViewStyle(.circular)
            }
        }.onAppear{
//            UserStore.shared.logout()
            maybeUpdateShit()
        }
        .background(Color(uiColor: .systemGroupedBackground))
        .sheet(item: $selectedWorkout) { item in
            let viewModel = WorkoutDetailViewModel(workout: item)
            WorkoutDetailView(viewModel: viewModel)
        }
        .sheet(item: $selectedPlannedWorkout) { item in
            let viewModel = WorkoutDetailViewModel(workout: item)
            WorkoutDetailView(viewModel: viewModel, showAddToCalendar: false)
        }
        .sheet(isPresented: $showLoginView) {
            LoginView(completion: {
                self.needsUpdating = true
                maybeUpdateShit()
            })
        }
        .onReceive(pub) { (output) in
            self.needsUpdating = true
            maybeUpdateShit()
        }
    }
    
    func plannedWorkout(workouts: [PlannedWorkout]) -> some View {
        List {
            ForEach(workouts, id:\.workout.name) { plannedWorkout in
                HStack {
                    VStack(alignment: .leading) {
                        Text(plannedWorkout.onDate.plannedDate?.weekDay ?? "-")
                            .font(.title)
                        
                        Text(plannedWorkout.onDate.plannedDate?.monthString ?? "-")
                            .font(.title)
                        
                        Text(plannedWorkout.onDate.plannedDate?.dateString ?? "-")
                            .font(.title)
                    }
                    
                    Divider()
                    
                    VStack {
                        Text(plannedWorkout.workout.name)
                            .font(.title)
                            .frame(maxWidth: .infinity, alignment: .leading)
                        
                        Text(plannedWorkout.workout.description ?? "")
                            .font(.body)
                            .frame(maxWidth: .infinity, alignment: .leading)
                        
                        Text(plannedWorkout.onDate)
                            .font(.footnote)
                            .frame(maxWidth: .infinity, alignment: .leading)
                    }
                    .contentShape(Rectangle())
                    .onTapGesture {
                        selectedPlannedWorkout = plannedWorkout.workout
                    }
                }
            }
        }
    }
    
    func maybeUpdateShit() {
        if UserStore.shared.token != nil{
            if UserStore.shared.plannedWorkouts.isEmpty {
                UserStore.shared.fetchPlannedWorkouts()
            }
            
            if needsUpdating {
                self.isUpdating = true
                dataStore.fetchAllData()
                
                AllWorkoutFetchable().fetch(completion: { result in
                    needsUpdating = false
                    switch result {
                    case .success(let model):
                        DispatchQueue.main.async {
                            self.workouts = model
                            self.isUpdating = false
                        }
                    case .failure(_):
                        DispatchQueue.main.async {
                            self.isUpdating = false
                        }
                    }
                })
            }
        } else {
            showLoginView = true
        }
    }
}

struct AllWorkoutPickerView: View {
    var mainViews: [MainViewTypes]
    @Binding var selectedSegment: MainViewTypes
    @StateObject var bridgeModule = BridgeModule.shared
    var showCurrentWorkout: (() -> Void)
    
    var body: some View {
        HStack {
            Picker("", selection: $selectedSegment) {
                ForEach(mainViews, id: \.self) { viewType in
                    Text(viewType.title)
                }
            }
            .pickerStyle(.segmented)
            .padding([.top, .leading, .trailing])
            
            if bridgeModule.isInWorkout {
                Button(action: {
                    showCurrentWorkout()
                }, label: {
                    Image(systemName: "figure.strengthtraining.traditional")
                        .padding(.trailing)
                })
                .tint(.blue)
            }
        }
    }
}

struct AllWorkoutsListView: View {
    @State var searchString: String = ""
    let workouts: [Workout]
    
    let selectedWorkout: ((Workout) -> Void)
    
    var filteredWorkouts: [Workout] {
        if !searchString.isEmpty, searchString.count > 0 {
            return workouts.filter({
                if $0.name.lowercased().contains(searchString.lowercased()) {
                    return true
                }
                if let equipment = $0.equipment?.joined(separator: "").lowercased(),
                   equipment.contains(searchString.lowercased()) {
                    return true
                }
                if let muscles = $0.muscles?.joined(separator: "").lowercased(),
                   muscles.contains(searchString.lowercased()) {
                    return true
                }
                
                return false
            })
        } else {
            return workouts
        }
    }
    var refresh: (() -> Void)
    
    var body: some View {
        VStack {
            List {
                ForEach(filteredWorkouts, id:\.name) { workout in
                    Section {
                        VStack {
                            Text(workout.name)
                                .font(.title2)
                                .frame(maxWidth: .infinity, alignment: .leading)
                            Text(workout.description ?? "")
                                .frame(maxWidth: .infinity, alignment: .leading)
                            
                            if let muscles = workout.muscles,
                               muscles.joined(separator: ", ").count > 0{
                                Divider()
                                Text(muscles.joined(separator: ", "))
                                    .font(.footnote)
                                    .frame(maxWidth: .infinity, alignment: .leading)
                            }
                            
                            if let equipment = workout.equipment,
                               equipment.joined(separator: ", ").count > 0 {
                                Divider()
                                Text(equipment.joined(separator: ", "))
                                    .font(.footnote)
                                    .frame(maxWidth: .infinity, alignment: .leading)
                            }
                        }
                        .contentShape(Rectangle())
                        .onTapGesture {
                            selectedWorkout(workout)
                        }
                    }
                }
            }
            .refreshable {
                refresh()
            }
            
            TextField("Filter" ,text: $searchString)
                .padding()
                .textFieldStyle(OvalTextFieldStyle())
//            TextField("Filter", text: $searchString)
//                .padding()
//                .overlay(RoundedRectangle(cornerRadius: 10.0).strokeBorder(Color(uiColor: .darkGray), style: StrokeStyle(lineWidth: 1.0)))
//                .padding()
//                .background(Color(uiColor: .systemGroupedBackground))
        }
    }
}

struct AllWorkoutsView_Previews: PreviewProvider {
    static var previews: some View {
        AllWorkoutsView(workouts: PreviewData.allWorkouts())
    }
}