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

import SwiftUI
import SwiftData

/// The Splits library screen, pushed from Settings → Library: a two-column grid of
/// split tiles. Tapping a tile opens `SplitDetailView`; long-pressing offers Delete
/// (the sole split-delete affordance); the toolbar's + adds a new split. Starter
/// splits are seeded automatically on the true first run (`SyncEngine.autoSeedIfEmpty`),
/// so an empty library just invites creating one.
struct SplitListView: View {
    @Environment(SyncEngine.self) private var sync

    @Query(sort: \Split.order) private var splits: [Split]

    @State private var showingAddSheet = false
    @State private var splitToDelete: Split?

    var body: some View {
        ScrollView {
            LazyVGrid(columns: [GridItem(.flexible()), GridItem(.flexible())], spacing: 16) {
                ForEach(splits) { split in
                    NavigationLink {
                        SplitDetailView(split: split)
                    } label: {
                        SplitItem(split: split)
                    }
                    .contextMenu {
                        Button(role: .destructive) {
                            splitToDelete = split
                        } label: {
                            Label("Delete", systemImage: "trash")
                        }
                    }
                }
            }
            .padding()
        }
        .overlay {
            if splits.isEmpty {
                ContentUnavailableView(
                    "No Splits Yet",
                    systemImage: "dumbbell.fill",
                    description: Text("Create a split to organize your workout routine.")
                )
            }
        }
        .navigationTitle("Splits")
        .toolbar {
            ToolbarItem(placement: .navigationBarTrailing) {
                Button {
                    showingAddSheet = true
                } label: {
                    Image(systemName: "plus")
                }
                .accessibilityLabel("Add Split")
            }
        }
        .sheet(isPresented: $showingAddSheet) {
            SplitAddEditView(split: nil)
        }
        .confirmationDialog(
            "Delete Split?",
            isPresented: Binding(
                get: { splitToDelete != nil },
                set: { if !$0 { splitToDelete = nil } }
            ),
            titleVisibility: .visible,
            presenting: splitToDelete
        ) { split in
            Button("Delete", role: .destructive) {
                Task { await sync.delete(split: split) }
                splitToDelete = nil
            }
            Button("Cancel", role: .cancel) {
                splitToDelete = nil
            }
        } message: { split in
            Text("This will permanently delete \"\(split.name)\" and all its exercises. Past workouts are kept.")
        }
    }
}