//
//  CompletedWorkoutView.swift
//  Werkout_ios
//
//  Created by Trey Tartt on 6/22/23.
//

import SwiftUI

struct CompletedWorkoutView: View {
    @ObservedObject var bridgeModule = BridgeModule.shared
    var postData: [String: Any]
    let workout: Workout
    @Environment(\.dismiss) var dismiss
    
    @State var difficulty: Float = 0
    @State var notes: String = ""
    let completedWorkoutDismissed: ((Bool) -> Void)?
    
    var body: some View {
        VStack {
            topViews()
            
            Divider()
            
            HStack {
                calsBurned()
                    .frame(maxWidth: .infinity)
                
                heartRates()
                    .frame(maxWidth: .infinity)
            }

            rateWorkout()
                .frame(maxHeight: 88)

            Divider()

            TextField("Notes", text: $notes)
                .frame(height: 55)
                .textFieldStyle(PlainTextFieldStyle())
                .padding([.horizontal], 4)
                .overlay(RoundedRectangle(cornerRadius: 16).stroke(Color(uiColor: .clear))).background(Color(uiColor: .init(red: 200/255, green: 200/255, blue: 200/255, alpha: 0.2)))
                .cornerRadius(8)

            Spacer()

            Button("Upload", action: {
                upload(postBody: postData)
            })
            .frame(maxWidth: .infinity, alignment: .center)
            .frame(height: 44)
            .foregroundColor(.blue)
            .background(.yellow)
            .cornerRadius(8)
            .padding()
            .frame(maxWidth: .infinity)
        }
        .padding([.leading, .trailing])
    }
    
    func topViews() -> some View {
        VStack {
            Text(workout.name)
                .frame(maxWidth: .infinity, alignment: .leading)
                .font(.title3)
                .padding(.top
                )
            if let desc = workout.description {
                Text(desc)
                    .frame(maxWidth: .infinity, alignment: .leading)
                    .font(.body)
                    .padding(.top)
                
            }
        }
    }
    
    func calsBurned() -> some View {
        VStack {
            if let cals = postData["total_calories"] as? Float {
                HStack {
                    Image(systemName: "flame.fill")
                        .foregroundColor(.orange)
                        .font(.title)
                    VStack {
                        Text("\(cals, specifier: "%.0f")")
                    }
                }
            }
        }
    }
    
    func rateWorkout() -> some View {
        VStack {
            Divider()
            
            HStack {
                Text("Easy")
                    .foregroundColor(.green)
                Spacer()
                Text("Death")
                    .foregroundColor(.red)
            }
            
            ZStack {
                LinearGradient(
                    gradient: Gradient(colors: [.green, .red]),
                    startPoint: .leading,
                    endPoint: .trailing
                )
                .mask(Slider(value: $difficulty, in: 0...5, step: 1))
                
                // Dummy replicated slider, to allow sliding
                Slider(value: $difficulty, in: 0...5, step: 1)
                    .opacity(0.05) // Opacity is the trick here.
                    .accentColor(.clear)
            }
        }
    }
    
    func heartRates() -> some View {
        VStack {
            if let heartRates = postData["heart_rates"] as? [Int],
               heartRates.count > 0 {
                let avg = heartRates.reduce(0, +)/heartRates.count
                HStack {
                    Image(systemName: "heart")
                        .foregroundColor(.red)
                        .font(.title)
                    VStack {
                        HStack {
                            Text("\(heartRates.min() ?? 0)")
                            Text("-")
                            Text("\(heartRates.max() ?? 0)")
                        }
                        Text("\(avg)")
                    }
                }
            }
        }
    }
    
    func upload(postBody: [String: Any]) {
        var _postBody = postBody
        _postBody["difficulty"] = difficulty
        _postBody["notes"] = notes
        
        
        CompleteWorkoutFetchable(postData: _postBody).fetch(completion: { result in
            switch result {
            case .success(_):
                DispatchQueue.main.async {
                    bridgeModule.resetCurrentWorkout()
                    dismiss()
                    completedWorkoutDismissed?(true)
                }
            case .failure(let failure):
                print(failure)
            }
        })
    }
}

struct CompletedWorkoutView_Previews: PreviewProvider {
    static let postBody = [
        "difficulty": 1,
        "workout_start_time": Date().timeFormatForUpload,
        "workout": 1,
        "total_time": 140,
        "total_calories": Float(120.0),
        "heart_rates": [65,65,4,54,232,12]
    ] as [String : Any]
    
    static let workout = PreviewData.workout()
    
    static var previews: some View {
        CompletedWorkoutView(postData: CompletedWorkoutView_Previews.postBody,
                             workout: workout,
                             completedWorkoutDismissed: { _ in })
    }
}