import Recording
import SwiftUI

/// The root view of the Attendi sample app.
///
/// The view hosts the `RecordingView` feature from the `Recording` target of the `Features` package, which drives the whole recording flow,
/// inside a navigation stack, and presents the transcribed text of every processed recording in a modal sheet of its own navigation stack.
///
/// The services attached to the feature and the transcription shown in the sheet live in the view's ``Model``; the view itself only renders it and
/// forwards the feature's output and the sheet's dismissal. The navigation titles of the stacks are localized through the app's string catalog.
struct ContentView: View {

    // MARK: Properties

    /// The model that owns the attached services and the transcription presented in the modal sheet.
    @State private var model = Model()

    // MARK: Body

    /// The content of the view: a navigation stack with the recording feature's view, attached to the model's services, with a toolbar picker
    /// for the locale of the spoken language to transcribe, and a modal sheet presenting the transcribed text of every processed recording —
    /// or a content unavailable message when the transcription is empty — closable through its toolbar button or a swipe.
    var body: some View {
        NavigationStack {
            RecordingView(
                capturer: model.capturer,
                transcriber: model.transcriber,
                locale: $model.locale,
            ) { transcription in
                model.received(transcription)
            }
            .navigationTitle("view.recording.navigation.title")
            #if !os(macOS)
            .navigationBarTitleDisplayMode(.inline)
            #endif
            .toolbar {
                ToolbarItem(placement: .primaryAction) {
                    Menu {
                        Picker(
                            "view.recording.picker.locale.title",
                            selection: $model.locale
                        ) {
                            ForEach(
                                model.locales,
                                id: \.self
                            ) {
                                Text(model.name(for: $0))
                                    .tag($0)
                            }
                        }
                        .pickerStyle(.inline)
                    } label: {
                        Label(
                            "view.recording.picker.locale.title",
                            systemImage: "globe"
                        )
                    }
                    .disabled(model.locales.isEmpty)
                }
            }
            .task {
                await model.load()
            }
        }
        .sheet(item: $model.transcription) { transcription in
            NavigationStack {
                Group {
                    if transcription.isEmpty {
                        ContentUnavailableView(
                            "view.transcription.unavailable.title",
                            systemImage: "text.page.slash",
                            description: Text("view.transcription.unavailable.description")
                        )
                    } else {
                        ScrollView {
                            Text(transcription.text)
                                .font(.body)
                                .fontWeight(.regular)
                                .foregroundStyle(.primary)
                                .frame(
                                    maxWidth: .infinity,
                                    alignment: .leading
                                )
                                .padding()
                        }
                    }
                }
                .navigationTitle("view.transcription.navigation.title")
                #if !os(macOS)
                .navigationBarTitleDisplayMode(.inline)
                #endif
                .toolbar {
                    Button(role: .close) {
                        model.dismissed()
                    }
                }
            }
            .presentationDetents([.medium, .large])
        }
    }

}

// MARK: - Previews

#Preview(
    "Content view"
) {
    ContentView()
}