//
// SplitExerciseAssignment.swift
// Workouts
//
// Created by rzen on 7/15/25 at 7:12 AM.
//
// Copyright 2025 Rouslan Zenetl. All Rights Reserved.
//

import SwiftUI

struct ExerciseAddEditView: View {
    @Environment(\.modelContext) private var modelContext
    @Environment(\.dismiss) private var dismiss
    @State private var showingExercisePicker = false

    @State var model: Exercise
    
    @State var originalWeight: Int? = nil
    
    var body: some View {
        NavigationStack {
            Form {
                Section(header: Text("Exercise")) {
                    let exerciseName = model.name
                    if exerciseName.isEmpty {
                        Button(action: {
                            showingExercisePicker = true
                        }) {
                            HStack {
                                Text(model.name.isEmpty ? "Select Exercise" : model.name)
                                Spacer()
                                Image(systemName: "chevron.right")
                                    .foregroundColor(.gray)
                            }
                        }
                    } else {
                        ListItem(title: exerciseName)
                    }
                }
                
                Section (header: Text("Sets/Reps")) {
                    Stepper("Sets: \(model.sets)", value: $model.sets, in: 1...10)
                    Stepper("Reps: \(model.reps)", value: $model.reps, in: 1...50)
                }
                
                // Weight section
                Section (header: Text("Weight")) {
                    HStack {
                        VStack(alignment: .center) {
                            Text("\(model.weight) lbs")
                                .font(.headline)
                        }
                        Spacer()
                        VStack(alignment: .trailing) {
                            Stepper("±1", value: $model.weight, in: 0...1000)
                            Stepper("±5", value: $model.weight, in: 0...1000, step: 5)
                        }
                        .frame(width: 130)
                    }
                }
                
                Section (header: Text("Weight Increase")) {
                    HStack {
                        Text("Remind every \(model.weightReminderTimeIntervalWeeks) weeks")
                        Spacer()
                        Stepper("", value: $model.weightReminderTimeIntervalWeeks, in: 0...366)
                    }
                    HStack {
                        Text("Last weight change \(Date().humanTimeInterval(to: model.weightLastUpdated)) ago")
                    }
                }
            }
            .onAppear {
                originalWeight = model.weight
            }
            .sheet(isPresented: $showingExercisePicker) {
                ExercisePickerView { exerciseNames in
                    model.name = exerciseNames.first ?? "Exercise.unnamed"
                }
            }
            .navigationTitle(model.name.isEmpty ? "New Exercise" : model.name)
            .toolbar {
                ToolbarItem(placement: .navigationBarLeading) {
                    Button("Cancel") {
                        dismiss()
                    }
                }
                
                ToolbarItem(placement: .navigationBarTrailing) {
                    Button("Save") {
                        if let originalWeight = originalWeight {
                            if originalWeight != model.weight {
                                model.weightLastUpdated = Date()
                            }
                        }
                        try? modelContext.save()
                        dismiss()
                    }
                }
            }
        }
    }
}