//
//  FamilyActivityPickerHost.swift
//  QuickLocation
//

import FamilyControls
import SwiftUI
import UIKit
import ManagedSettings

@available(iOS 16.0, *)
private struct FamilyActivityPickerSheet: View {
    @State private var selection: FamilyActivitySelection
    @State private var isPresented = true
    let onComplete: (FamilyActivitySelection) -> Void

    init(initial: FamilyActivitySelection, onComplete: @escaping (FamilyActivitySelection) -> Void) {
        _selection = State(initialValue: initial)
        self.onComplete = onComplete
    }

    var body: some View {
        Color.clear
            .familyActivityPicker(isPresented: $isPresented, selection: $selection)
            .onChange(of: isPresented) { presented in
                if !presented {
                    onComplete(selection)
                }
            }
    }
}

@available(iOS 16.0, *)
final class FamilyActivityPickerPresenter: UIViewController {
    private let initial: FamilyActivitySelection
    var onComplete: ((FamilyActivitySelection) -> Void)?

    init(selection: FamilyActivitySelection = FamilyActivitySelection()) {
        self.initial = selection
        super.init(nibName: nil, bundle: nil)
        modalPresentationStyle = .overFullScreen
        view.backgroundColor = .clear
    }

    required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        guard children.isEmpty else { return }
        let root = FamilyActivityPickerSheet(initial: initial) { [weak self] selection in
            self?.onComplete?(selection)
            self?.dismiss(animated: false)
        }
        let host = UIHostingController(rootView: root)
        host.view.backgroundColor = .clear
        addChild(host)
        view.addSubview(host.view)
        host.view.frame = .zero
        host.didMove(toParent: self)
    }
}

@available(iOS 16.0, *)
struct ApplicationTokenLabelView: View {
    let token: ApplicationToken

    var body: some View {
        Label(token)
            .labelStyle(.titleAndIcon)
            .lineLimit(1)
    }
}

@available(iOS 16.0, *)
struct ApplicationTokenIconView: View {
    let token: ApplicationToken

    var body: some View {
        Label(token)
            .labelStyle(.iconOnly)
            .scaleEffect(2.4)
            .frame(width: 40, height: 40)
            .clipped()
    }
}

@available(iOS 16.0, *)
final class ApplicationTokenIconHostingView: UIView {
    private let hosting: UIHostingController<ApplicationTokenIconView>

    init(token: ApplicationToken) {
        hosting = UIHostingController(rootView: ApplicationTokenIconView(token: token))
        super.init(frame: .zero)
        hosting.view.backgroundColor = .clear
        addSubview(hosting.view)
        hosting.view.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            hosting.view.topAnchor.constraint(equalTo: topAnchor),
            hosting.view.leadingAnchor.constraint(equalTo: leadingAnchor),
            hosting.view.trailingAnchor.constraint(equalTo: trailingAnchor),
            hosting.view.bottomAnchor.constraint(equalTo: bottomAnchor)
        ])
    }

    required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }

    func update(token: ApplicationToken) {
        hosting.rootView = ApplicationTokenIconView(token: token)
    }
}

@available(iOS 16.0, *)
final class ApplicationTokenLabelHostingView: UIView {
    private let hosting: UIHostingController<ApplicationTokenLabelView>

    init(token: ApplicationToken) {
        hosting = UIHostingController(rootView: ApplicationTokenLabelView(token: token))
        super.init(frame: .zero)
        hosting.view.backgroundColor = .clear
        addSubview(hosting.view)
        hosting.view.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            hosting.view.topAnchor.constraint(equalTo: topAnchor),
            hosting.view.leadingAnchor.constraint(equalTo: leadingAnchor),
            hosting.view.trailingAnchor.constraint(equalTo: trailingAnchor),
            hosting.view.bottomAnchor.constraint(equalTo: bottomAnchor)
        ])
    }

    required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }

    func update(token: ApplicationToken) {
        hosting.rootView = ApplicationTokenLabelView(token: token)
    }
}