import UIKit

public protocol RDEPUBReaderDelegate: AnyObject {

    func epubReader(_ reader: UIViewController, didOpen publication: RDEPUBPublication)

    func epubReader(_ reader: UIViewController, didUpdateLocation location: RDEPUBLocation)

    func epubReaderDidReachEnd(_ reader: UIViewController)

    func epubReader(_ reader: UIViewController, didChangeSelection selection: RDEPUBSelection?)

    func epubReader(_ reader: UIViewController, didUpdateHighlights highlights: [RDEPUBHighlight])

    func epubReader(_ reader: UIViewController, didUpdateBookmarks bookmarks: [RDEPUBBookmark])

    func epubReader(_ reader: UIViewController, didUpdateSearchResult result: RDEPUBSearchResult?)

    func epubReader(_ reader: UIViewController, didChangeCurrentSearchMatch match: RDEPUBSearchMatch?)

    func epubReader(_ reader: UIViewController, didUpdateCurrentTableOfContentsItem item: RDEPUBReaderTableOfContentsItem?)

    func epubReader(_ reader: UIViewController, didActivateExternalLink url: URL)

    func epubReader(_ reader: UIViewController, shouldOpenExternalURL url: URL) -> Bool

    func epubReader(_ reader: UIViewController, didFailWithError error: Error)

    func epubReader(_ reader: UIViewController, configureTopToolView topToolView: RDEPUBReaderTopToolViewProviding)

    /// 提供试读墙视图（configuration.trialPolicy 非 nil 时生效）。
    /// 返回非 nil 时，阅读器在最后一个可读页之后追加一页展示该视图；返回 nil 则不追加试读墙。
    /// 视图的购买 / 登录按钮由宿主自行处理（可在点击后调用 reloadBook() 切换到完整 epub）。
    func epubReaderTrialWallView(_ reader: UIViewController) -> UIView?

    /// 用户翻到试读墙页时回调（宿主可在此触发购买引导 / 埋点等）。
    func epubReaderDidReachTrialWall(_ reader: UIViewController)
}

public extension RDEPUBReaderDelegate {
    func epubReader(_ reader: UIViewController, didOpen publication: RDEPUBPublication) {}
    func epubReader(_ reader: UIViewController, didUpdateLocation location: RDEPUBLocation) {}
    func epubReaderDidReachEnd(_ reader: UIViewController) {}
    func epubReader(_ reader: UIViewController, didChangeSelection selection: RDEPUBSelection?) {}
    func epubReader(_ reader: UIViewController, didUpdateHighlights highlights: [RDEPUBHighlight]) {}
    func epubReader(_ reader: UIViewController, didUpdateBookmarks bookmarks: [RDEPUBBookmark]) {}
    func epubReader(_ reader: UIViewController, didUpdateSearchResult result: RDEPUBSearchResult?) {}
    func epubReader(_ reader: UIViewController, didChangeCurrentSearchMatch match: RDEPUBSearchMatch?) {}
    func epubReader(_ reader: UIViewController, didUpdateCurrentTableOfContentsItem item: RDEPUBReaderTableOfContentsItem?) {}
    func epubReader(_ reader: UIViewController, didActivateExternalLink url: URL) {}
    func epubReader(_ reader: UIViewController, shouldOpenExternalURL url: URL) -> Bool { true }
    func epubReader(_ reader: UIViewController, didFailWithError error: Error) {}
    func epubReader(_ reader: UIViewController, configureTopToolView topToolView: RDEPUBReaderTopToolViewProviding) {}
    func epubReaderTrialWallView(_ reader: UIViewController) -> UIView? { nil }
    func epubReaderDidReachTrialWall(_ reader: UIViewController) {}
}