import UIKit

final class RDEPUBReaderState {

    var parser: RDEPUBParser?

    var publication: RDEPUBPublication?

    var readingSession: RDEPUBReadingSession?

    var textBook: RDEPUBTextBook?

    var bookPageMap: RDEPUBBookPageMap?

    var activeBookmarks: [RDEPUBBookmark] = []

    var activeHighlights: [RDEPUBHighlight] = []

    var currentBookIdentifier: String?

    var paginationToken = UUID()

    var paginator: RDEPUBPaginator?

    var searchState: RDEPUBSearchState?

    var pendingFullPageMap: RDEPUBBookPageMap?

    var lastTextPaginationPageSize: CGSize?

    var lastMetadataParseWallClockMs: Int = 0

    var lastMetadataParseConcurrency: Int = 0

    var selectionState: RDEPUBSelectionState = .idle

    var isRepaginating: Bool = false

    var didStartInitialLoad: Bool = false

    var isExternalTextBook: Bool = false

    var textFileURL: URL?

    let textBookCache = RDEPUBTextBookCache()

    var currentSelection: RDEPUBSelection? {
        get { selectionState.selection }
        set {
            if let newValue, !newValue.isEmpty {
                selectionState = .selected(newValue)
            } else {
                selectionState = .idle
            }
        }
    }

    var activePages: [EPUBPage] {
        readingSession?.activePages ?? []
    }

    var activeChapters: [EPUBChapterInfo] {
        readingSession?.activeChapters ?? []
    }

    func replaceActiveSnapshot(_ snapshot: RDEPUBReadingSession.PaginationSnapshot) {
        readingSession?.setActiveSnapshot(snapshot)
    }

    func clearActiveSnapshot() {
        readingSession?.resetRuntimeState()
    }
}