ReadViewSDK/Sources/RDReaderView/EPUBCore/RDEPUBWebView+Configuration.swift

// RDEPUBWebView+Configuration.swift
// RDEPUBWebView 的 WKWebView 配置扩展
// 负责按需创建和配置 WKWebView 实例：注册 JS 桥接消息处理器、
// 注入用户脚本、设置自定义 URL Scheme 处理器、配置滚动和外观属性。
// 同时处理选择菜单（拷贝/高亮/批注）和 WebView 销毁清理。

import UIKit
import WebKit

extension RDEPUBWebView {
    /// 按需配置 WKWebView（仅在 Publication 变更或 WebView 不存在时重建）
    func configureWebViewIfNeeded(publication: RDEPUBPublication) {
        let parser = publication.parser
        let publicationKey = parser.opfURL?.path ?? parser.extractionRootURL?.path ?? UUID().uuidString
        if publicationKey == configuredPublicationKey, webView != nil {
            return
        }

        teardownWebView()

        let userContentController = WKUserContentController()
        RDEPUBJavaScriptBridge.messageNames.forEach {
            userContentController.add(self, name: $0)
        }
        userContentController.addUserScript(
            WKUserScript(
                source: RDEPUBJavaScriptBridge.userScript,
                injectionTime: .atDocumentEnd,
                forMainFrameOnly: true
            )
        )

        let configuration = WKWebViewConfiguration()
        configuration.websiteDataStore = .nonPersistent()
        configuration.userContentController = userContentController
        let schemeHandler = RDEPUBResourceURLSchemeHandler(parser: parser)
        configuration.setURLSchemeHandler(schemeHandler, forURLScheme: RDEPUBResourceURLSchemeHandler.scheme)

        let webView = RDEPUBAnnotationWebView(frame: bounds, configuration: configuration)
        webView.onSelectionAction = { [weak self] action in
            guard let self else { return }
            self.handleSelectionMenuAction(action)
        }
        UIMenuController.shared.menuItems = [
            UIMenuItem(title: "拷贝", action: #selector(RDEPUBAnnotationWebView.rd_copy(_:))),
            UIMenuItem(title: "高亮", action: #selector(RDEPUBAnnotationWebView.rd_highlight(_:))),
            UIMenuItem(title: "批注", action: #selector(RDEPUBAnnotationWebView.rd_annotate(_:)))
        ]
        webView.navigationDelegate = self
        webView.scrollView.isScrollEnabled = false
        webView.scrollView.showsHorizontalScrollIndicator = false
        webView.scrollView.showsVerticalScrollIndicator = false
        webView.scrollView.bounces = false
        webView.scrollView.alwaysBounceHorizontal = false
        webView.scrollView.alwaysBounceVertical = false
        webView.scrollView.clipsToBounds = true
        webView.scrollView.panGestureRecognizer.isEnabled = false
        webView.scrollView.pinchGestureRecognizer?.isEnabled = false
        webView.isOpaque = false
        webView.backgroundColor = .clear
        webView.clipsToBounds = true
        if #available(iOS 16.4, *) {
            webView.isInspectable = RDEPUBWebViewDebug.isInspectableEnabled
        }

        addSubview(webView)
        webView.frame = bounds
        webView.autoresizingMask = [.flexibleWidth, .flexibleHeight]

        self.schemeHandler = schemeHandler
        self.webView = webView
        self.configuredPublicationKey = publicationKey
        RDEPUBWebViewDebug.log(debugScope, message: "configured webView=\(RDEPUBWebViewDebug.webViewID(webView)) publicationKey=\(publicationKey)")
    }

    /// 处理选择菜单动作（拷贝/高亮/批注），通知委托并清除选择
    func handleSelectionMenuAction(_ action: RDEPUBAnnotationMenuAction) {
        delegate?.epubWebView(self, didRequestSelectionAction: action)
        clearWebSelection()
    }

    /// 清除 WebView 中的文本选择
    func clearWebSelection() {
        webView?.evaluateJavaScript("window.getSelection && window.getSelection().removeAllRanges();")
    }

    /// 销毁 WebView，移除所有消息处理器和引用
    func teardownWebView() {
        cancelFixedLayoutReadyFallback()
        if let webView {
            RDEPUBWebViewDebug.log(debugScope, message: "teardown webView=\(RDEPUBWebViewDebug.webViewID(webView))")
        }
        webView?.navigationDelegate = nil
        if let userContentController = webView?.configuration.userContentController {
            RDEPUBJavaScriptBridge.messageNames.forEach {
                userContentController.removeScriptMessageHandler(forName: $0)
            }
        }
        (webView as? RDEPUBAnnotationWebView)?.onSelectionAction = nil
        webView?.removeFromSuperview()
        webView = nil
        schemeHandler = nil
        configuredPublicationKey = nil
        currentLoadSignature = nil
    }
}

extension UIColor {
    /// 将 UIColor 转换为 CSS 十六进制颜色字符串（如 "#FF0000"）
    var ss_hexString: String {
        var red: CGFloat = 0
        var green: CGFloat = 0
        var blue: CGFloat = 0
        var alpha: CGFloat = 0
        getRed(&red, green: &green, blue: &blue, alpha: &alpha)
        return String(format: "#%02X%02X%02X", Int(red * 255), Int(green * 255), Int(blue * 255))
    }
}