import Foundation

/// One episode file in the library. `metaPath` points at the `.meta` sidecar
/// once Phase 4 enrichment runs; nil until then.
public struct CachedEpisode: Codable, Sendable, Hashable, Identifiable {
    public var path: String
    public var season: Int
    public var episode: Int
    public var label: String
    public var metaPath: String?

    public var id: String { path }

    public init(path: String, season: Int, episode: Int, label: String, metaPath: String? = nil) {
        self.path = path; self.season = season; self.episode = episode
        self.label = label; self.metaPath = metaPath
    }
}

/// A show grouped from the scan. `posterPath`/`overview` are filled by Phase 4
/// (TMDB) and survive rescans (merged back in by rootDir).
public struct CachedShow: Codable, Sendable, Hashable, Identifiable {
    public var name: String
    public var rootDir: String
    public var posterPath: String?
    public var overview: String?
    public var episodes: [CachedEpisode]

    public var id: String { rootDir }

    public init(name: String, rootDir: String, posterPath: String? = nil,
                overview: String? = nil, episodes: [CachedEpisode]) {
        self.name = name; self.rootDir = rootDir; self.posterPath = posterPath
        self.overview = overview; self.episodes = episodes
    }

    /// Distinct season numbers, ascending.
    public var seasons: [Int] {
        Array(Set(episodes.map(\.season))).sorted()
    }

    public func episodes(inSeason s: Int) -> [CachedEpisode] {
        episodes.filter { $0.season == s }.sorted { $0.episode < $1.episode }
    }
}

/// The on-disk library snapshot — browsable offline. Source records how it was
/// built ("scan" from ~/media, "registry" from media-recommender's list).
public struct LibrarySnapshot: Codable, Sendable {
    public var shows: [CachedShow]
    public var capturedAt: Date
    public var source: String

    public init(shows: [CachedShow], capturedAt: Date, source: String) {
        self.shows = shows; self.capturedAt = capturedAt; self.source = source
    }
}

/// A resume candidate for the "Continue watching" rail, unioned from the plum
/// watchlog and VLC's recents. `show`/`season`/`episode` are present for
/// watchlog entries (so black can `resume-show`); VLC recents carry only a path.
public struct ContinueItem: Sendable, Equatable, Identifiable {
    public var title: String
    public var path: String
    public var show: String?
    public var season: Int?
    public var episode: Int?
    public var positionSeconds: Double?
    public var lastSeen: Date?
    public var source: String

    public var id: String { path }

    public init(title: String, path: String, show: String? = nil, season: Int? = nil,
                episode: Int? = nil, positionSeconds: Double? = nil,
                lastSeen: Date? = nil, source: String) {
        self.title = title; self.path = path; self.show = show; self.season = season
        self.episode = episode; self.positionSeconds = positionSeconds
        self.lastSeen = lastSeen; self.source = source
    }
}