//
//  AppSelectionSheet.swift
//  Severed
//

import FamilyControls
import SwiftUI

/// App/category/website selection wrapping Apple's `FamilyActivityPicker`,
/// presented as a plain sheet with a segmented Block / Allow Only control.
struct AppSelectionSheet: View {
    @Binding var draft: RuleDraft
    @Environment(\.dismiss) private var dismiss

    @State private var selection: FamilyActivitySelection
    @State private var mode: SelectionMode

    init(draft: Binding<RuleDraft>) {
        self._draft = draft
        self._selection = State(
            initialValue: AppSelectionCodec.decode(draft.wrappedValue.selectionData)
        )
        self._mode = State(initialValue: draft.wrappedValue.selectionMode)
    }

    var body: some View {
        NavigationStack {
            VStack(spacing: 0) {
                Picker("Mode", selection: $mode) {
                    ForEach(SelectionMode.allCases, id: \.self) { mode in
                        Text(mode.displayName).tag(mode)
                    }
                }
                .pickerStyle(.segmented)
                .padding(.horizontal)
                .padding(.vertical, 8)
                .accessibilityIdentifier("selectionModePicker")

                FamilyActivityPicker(selection: $selection)
            }
            .navigationTitle("Selected")
            .navigationBarTitleDisplayMode(.inline)
            .toolbar {
                ToolbarItem(placement: .cancellationAction) {
                    Button("Cancel") {
                        dismiss()
                    }
                    .accessibilityIdentifier("selectionBackButton")
                }
                ToolbarItem(placement: .confirmationAction) {
                    Button("Done") {
                        save()
                    }
                    .accessibilityIdentifier("confirmSelectionButton")
                }
            }
            .safeAreaInset(edge: .bottom) {
                VStack(spacing: 8) {
                    Text(selectionSummary)
                        .font(.footnote)
                        .foregroundStyle(.secondary)
                        .accessibilityIdentifier("selectionCountLabel")
                    Button {
                        save()
                    } label: {
                        Text("Save")
                            .frame(maxWidth: .infinity)
                    }
                    .buttonStyle(.borderedProminent)
                    .controlSize(.large)
                    .accessibilityIdentifier("saveSelectionButton")
                }
                .padding(.horizontal)
                .padding(.bottom, 8)
            }
        }
    }

    private var selectionSummary: String {
        let count = AppSelectionCodec.count(of: selection)
        return count == 1 ? "1 App Selected" : "\(count) Apps Selected"
    }

    private func save() {
        draft.selectionData = AppSelectionCodec.encode(selection)
        draft.selectionCount = AppSelectionCodec.count(of: selection)
        draft.selectionMode = mode
        dismiss()
    }
}