//
// 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 plain list of
/// splits, one row each. Tapping a row 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.name) private var splits: [Split]

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

    var body: some View {
        List {
            ForEach(splits) { split in
                NavigationLink {
                    SplitDetailView(split: split)
                } label: {
                    SplitRow(split: split)
                }
                .contextMenu {
                    Button(role: .destructive) {
                        splitToDelete = split
                    } label: {
                        Label("Delete", systemImage: "trash")
                    }
                }
            }
        }
        .listStyle(.insetGrouped)
        .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.")
        }
    }
}

/// A single split row: a small rounded-square badge (the split's color at low
/// opacity, its symbol tinted full-strength) beside the split name and its
/// exercise count.
private struct SplitRow: View {
    var split: Split

    var body: some View {
        HStack(spacing: 12) {
            Image(systemName: split.systemImage)
                .font(.title3)
                .foregroundStyle(splitColor)
                .frame(width: 36, height: 36)
                .background(splitColor.opacity(0.12), in: RoundedRectangle(cornerRadius: 8))

            VStack(alignment: .leading, spacing: 2) {
                Text(split.name)
                    .foregroundStyle(.primary)

                Text("\(split.exercisesArray.count) exercises")
                    .font(.caption)
                    .foregroundStyle(.secondary)
            }
        }
        .padding(.vertical, 2)
    }

    private var splitColor: Color {
        Color.color(from: split.color)
    }
}