import Foundation
import Observation

/// Observable, in-memory mirror of `PodcastIndex` so SwiftUI updates immediately
/// on changes — the Podcasts tab badge and the library list both read from here.
/// Route podcast mutations through this store so the unplayed badge stays in sync.
@Observable
@MainActor
final class PodcastLibrary {
    static let shared = PodcastLibrary()

    private(set) var entries: [PodcastEntry] = []

    var unplayed: [PodcastEntry] { entries.filter { !$0.isPlayed } }
    var played: [PodcastEntry] { entries.filter { $0.isPlayed } }
    var unplayedCount: Int { entries.reduce(0) { $0 + ($1.isPlayed ? 0 : 1) } }

    private init() { entries = PodcastIndex.all() }

    func reload() { entries = PodcastIndex.all() }

    func setPlayed(_ articleUrl: String, _ played: Bool) {
        PodcastIndex.setPlayed(articleUrl: articleUrl, played)
        reload()
    }

    func remove(_ articleUrl: String) {
        PodcastIndex.remove(articleUrl: articleUrl)
        reload()
    }
}