import SwiftUI

struct MainView: View {
    @EnvironmentObject var settings: Settings
    @State private var selectedTab: Int = 0
    @State private var manager = BooruManager(.yandere)

    var body: some View {
        #if os(macOS)
            ContentView()
                .environmentObject(settings)
                .environmentObject(manager)
                .onChange(of: settings.preferredBooru) { _, newState in
                    self.manager = BooruManager(newState)

                    Task {
                        await self.manager.fetchPosts()
                    }
                }
                .onAppear {
                    self.manager = BooruManager(self.settings.preferredBooru)

                    Task {
                        if manager.posts.isEmpty {
                            await self.manager.fetchPosts()
                        }
                    }
                }
        #else
            TabView(selection: $selectedTab) {
                ContentView()
                    .environmentObject(manager)
                    .tabItem {
                        Label("Posts", systemImage: "rectangle.stack")
                    }
                    .tag(0)

                NavigationStack {
                    BookmarksView(selectedTab: $selectedTab)
                        .environmentObject(manager)
                }
                .tabItem {
                    Label("Bookmarks", systemImage: "bookmark")
                }
                .tag(1)

                NavigationStack {
                    SettingsView()
                }
                .tabItem {
                    Label("Settings", systemImage: "gear")
                }
                .tag(2)
            }
            .environmentObject(settings)
            .onChange(of: settings.preferredBooru) { _, newState in
                self.manager = BooruManager(newState)

                Task {
                    await self.manager.fetchPosts()
                }
            }
            .onAppear {
                self.manager = BooruManager(self.settings.preferredBooru)

                Task {
                    if manager.posts.isEmpty {
                        await self.manager.fetchPosts()
                    }
                }
            }
        #endif
    }
}