//
// SplitListView.swift
// Workouts
//
// Created by rzen on 7/25/25 at 6:24 PM.
//
// Copyright 2025 Rouslan Zenetl. All Rights Reserved.
//

import SwiftUI
import CoreData

struct SplitListView: View {
    @Environment(\.managedObjectContext) private var viewContext

    @FetchRequest(
        sortDescriptors: [
            NSSortDescriptor(keyPath: \Split.order, ascending: true),
            NSSortDescriptor(keyPath: \Split.name, ascending: true)
        ],
        animation: .default
    )
    private var fetchedSplits: FetchedResults<Split>

    @State private var splits: [Split] = []
    @State private var allowSorting: Bool = true

    var body: some View {
        ScrollView {
            LazyVGrid(columns: [GridItem(.flexible()), GridItem(.flexible())], spacing: 16) {
                SortableForEach($splits, allowReordering: $allowSorting) { split, dragging in
                    NavigationLink {
                        SplitDetailView(split: split)
                    } label: {
                        SplitItem(split: split)
                            .overlay(dragging ? Color.white.opacity(0.8) : Color.clear)
                    }
                }
            }
            .padding()
        }
        .overlay {
            if fetchedSplits.isEmpty {
                ContentUnavailableView(
                    "No Splits Yet",
                    systemImage: "dumbbell.fill",
                    description: Text("Create a split to organize your workout routine.")
                )
            }
        }
        .onAppear {
            splits = Array(fetchedSplits)
        }
        .onChange(of: fetchedSplits.count) { _, _ in
            splits = Array(fetchedSplits)
        }
        .onChange(of: splits) { _, _ in
            saveContext()
        }
    }

    private func saveContext() {
        if viewContext.hasChanges {
            do {
                try viewContext.save()
            } catch {
                print("Error saving after reorder: \(error)")
            }
        }
    }
}