import Foundation

public struct RDEPUBChapterLocation: Codable, Equatable {

    public var spineIndex: Int

    public var chapterOffset: Int

    public var fragmentID: String?

    public var progressionInChapter: Double?

    public var schemaVersion: Int

    public init(
        spineIndex: Int,
        chapterOffset: Int,
        fragmentID: String? = nil,
        progressionInChapter: Double? = nil,
        schemaVersion: Int = 2
    ) {
        self.spineIndex = spineIndex
        self.chapterOffset = chapterOffset
        self.fragmentID = fragmentID.flatMap { $0.isEmpty ? nil : $0 }
        self.progressionInChapter = progressionInChapter
        self.schemaVersion = schemaVersion
    }

    var isFallbackEstimate: Bool { schemaVersion == 1 }
}