import Foundation
import SwiftData

/// Which section of the sidebar is selected — drives the central content area.
///
/// A single `@State var sidebarSelection: SidebarSection?` in ContentView replaces
/// the old triple-state model (selectedPlaylist + isBrowsePanelOpen + browsePanelTab).
enum SidebarSection: Hashable {
    /// Cloud library browsing — shows CloudBrowserView in center.
    case library(LibraryDestination)

    /// Playback queue — shows QueueView in center.
    case queue

    /// Soulseek downloads — shows DownloadsView in center.
    case downloads

    /// A user playlist — shows PlaylistView in center.
    case playlist(Playlist)
}

/// Which library view to show in the center area.
enum LibraryDestination: String, Hashable, CaseIterable {
    case browse   // root category grid
    case albums
    case artists
    case genres
    case years
    case search

    /// Map to CloudBrowserView's internal navigation.
    var initialNavStack: [CloudNavDestination] {
        switch self {
        case .browse: return []
        case .albums: return [.category(.album)]
        case .artists: return [.category(.artist)]
        case .genres: return [.category(.genre)]
        case .years: return [.category(.year)]
        case .search: return [.search(query: "")]
        }
    }

    var displayName: String {
        switch self {
        case .browse: return "Browse"
        case .albums: return "Albums"
        case .artists: return "Artists"
        case .genres: return "Genres"
        case .years: return "Years"
        case .search: return "Search"
        }
    }

    var icon: String {
        switch self {
        case .browse: return "globe"
        case .albums: return "square.stack"
        case .artists: return "music.mic"
        case .genres: return "guitars"
        case .years: return "calendar"
        case .search: return "magnifyingglass"
        }
    }
}