import SwiftUI

/// The three non-content states of any screen, rendered consistently.
struct LoadStateOverlay<Value: Sendable>: View {

    let state: LoadState<Value>
    /// Whether the underlying screen is showing nothing — a filter can
    /// empty a loaded list.
    var isEmpty = false

    var body: some View {
        switch state {
        case .loading:
            ProgressView()
        case .empty(let message):
            ContentUnavailableView {
                Label("Nothing here", systemImage: "tray")
            } description: {
                Text(message)
            }
        case .failed(let message):
            ContentUnavailableView {
                Label("Could not load", systemImage: "wifi.exclamationmark")
            } description: {
                Text(message)
            }
        case .loaded:
            if isEmpty {
                ContentUnavailableView.search
            }
        }
    }
}