import Foundation

final class RDEPUBRuntimeChapter {
    let spineIndex: Int
    let href: String
    let title: String

    /// 原始富文本（可按策略释放，不强制常驻）
    var sourceAttributedString: NSAttributedString?

    /// 排版后富文本
    let typesetAttributedString: NSAttributedString

    /// 排版器
    let layouter: RDEPUBTextLayouter

    /// 页范围
    let pageRanges: [NSRange]

    /// 页面数组
    let pages: [RDEPUBTextPage]

    /// 章节偏移映射
    let chapterOffsetMap: RDEPUBChapterOffsetMap

    init(
        spineIndex: Int,
        href: String,
        title: String,
        sourceAttributedString: NSAttributedString?,
        typesetAttributedString: NSAttributedString,
        layouter: RDEPUBTextLayouter,
        pageRanges: [NSRange],
        pages: [RDEPUBTextPage],
        chapterOffsetMap: RDEPUBChapterOffsetMap
    ) {
        self.spineIndex = spineIndex
        self.href = href
        self.title = title
        self.sourceAttributedString = sourceAttributedString
        self.typesetAttributedString = typesetAttributedString
        self.layouter = layouter
        self.pageRanges = pageRanges
        self.pages = pages
        self.chapterOffsetMap = chapterOffsetMap
    }

    /// 释放 sourceAttributedString 以降低内存
    func releaseSourceText() {
        sourceAttributedString = nil
    }
}