import Foundation

struct GalleryItem: Identifiable, Sendable {
    let id: String
    let filename: String
    let creationDate: Date?
    let duration: TimeInterval?  // non-nil for video
    let fileSize: Int64?
    let mediaType: MediaType
    let source: ItemSource

    enum MediaType: Sendable { case photo, video, unknown }

    enum ItemSource: Sendable {
        case phone(localIdentifier: String)
        case nas(path: String)
        case synced(localIdentifier: String, nasPath: String)

        var localIdentifier: String? {
            switch self { case .phone(let id), .synced(let id, _): id; case .nas: nil }
        }
        var nasPath: String? {
            switch self { case .nas(let p), .synced(_, let p): p; case .phone: nil }
        }
    }

    enum SyncState: Sendable {
        case phoneOnly   // orange — backed up soon
        case nasOnly     // blue — on NAS, not this device
        case synced      // green — confirmed both places
    }

    var syncState: SyncState {
        switch source {
        case .phone:   .phoneOnly
        case .nas:     .nasOnly
        case .synced:  .synced
        }
    }
}

struct GallerySection: Identifiable {
    var id: String        // "2026-05-17" or "unknown"
    var date: Date
    var title: String
    var items: [GalleryItem]
}