import SwiftUI

// MARK: - Root tab container with persistent mini-player overlay

struct RootTabView: View {
    @EnvironmentObject var authStore: AuthStore
    @EnvironmentObject var audioPlayer: AudioPlayerService

    @State private var selectedTab: Tab = .home
    @State private var showFullPlayer: Bool = false
    @State private var readerIsActive: Bool = false
    @State private var fullPlayerDragOffset: CGFloat = 0

    enum Tab: Hashable {
        case home, library, browse, search, profile
    }

    var body: some View {
        ZStack(alignment: .bottom) {
            TabView(selection: $selectedTab) {
                HomeView()
                    .tabItem { Label("Home", systemImage: "house.fill") }
                    .tag(Tab.home)

                LibraryView()
                    .tabItem { Label("Library", systemImage: "book.pages.fill") }
                    .tag(Tab.library)

                BrowseView()
                    .tabItem { Label("Discover", systemImage: "sparkles") }
                    .tag(Tab.browse)

                SearchView()
                    .tabItem { Label("Search", systemImage: "magnifyingglass") }
                    .tag(Tab.search)

                ProfileView()
                    .tabItem { Label("Profile", systemImage: "person.fill") }
                    .tag(Tab.profile)
            }

            // Mini player bar — sits above the tab bar
            if audioPlayer.isActive && !showFullPlayer && !readerIsActive {
                MiniPlayerBar(showFullPlayer: $showFullPlayer)
                    .padding(.bottom, 49)
                    .transition(.move(edge: .bottom).combined(with: .opacity))
                    .animation(.spring(response: 0.35, dampingFraction: 0.8), value: audioPlayer.isActive)
            }

            // Full player — slides up from the bottom
            if showFullPlayer {
                FullPlayerView(onDismiss: {
                    withAnimation(.spring(response: 0.4, dampingFraction: 0.85)) {
                        showFullPlayer = false
                        fullPlayerDragOffset = 0
                    }
                })
                .offset(y: max(fullPlayerDragOffset, 0))
                .gesture(
                    DragGesture(minimumDistance: 10)
                        .onChanged { value in
                            if value.translation.height > 0 {
                                fullPlayerDragOffset = value.translation.height
                            }
                        }
                        .onEnded { value in
                            let velocity = value.predictedEndTranslation.height - value.translation.height
                            if value.translation.height > 120 || velocity > 400 {
                                withAnimation(.spring(response: 0.4, dampingFraction: 0.85)) {
                                    showFullPlayer = false
                                    fullPlayerDragOffset = 0
                                }
                            } else {
                                withAnimation(.spring(response: 0.35, dampingFraction: 0.8)) {
                                    fullPlayerDragOffset = 0
                                }
                            }
                        }
                )
                .transition(.move(edge: .bottom))
                .animation(.spring(response: 0.45, dampingFraction: 0.85), value: showFullPlayer)
                .ignoresSafeArea()
            }
        }
        .animation(.spring(response: 0.45, dampingFraction: 0.85), value: showFullPlayer)
        .onPreferenceChange(HideMiniPlayerKey.self) { hide in
            readerIsActive = hide
        }
    }
}