//
//  ScanView.swift
//  XuXuCheck
//
//  Created by henseycai on 2025/6/25.
//

import SwiftUI
@preconcurrency
import WebKit

struct WebViewRepresentable: UIViewRepresentable {
    
    var currentUrl: String

    @Environment(WebViewModel.self) var webViewModel

//    let viewModel: WebViewModel
    let webView = WKWebView()
    @Environment(LoginStatus.self) var loginStatus
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }

    func makeUIView(context: Context) -> WKWebView  {
        webView.navigationDelegate = context.coordinator

        // 让网页从 webView 自己的顶端开始渲染。默认的 .automatic 会在 webView 铺到状态栏
        // 下面之后再加一份安全区 inset,内容被二次下推,顶部就多出一条空白带。
        // 它同时决定底部:内容区不再被安全区收窄,所以底部也不会自动让出 34pt,
        // 滚动内容会一直用到 webView 的物理底边。
        // 顶部到底留多少由 XuXuWebView 的 topSafeInset 统一控制;推导见 docs/webview-safe-area.md
        webView.scrollView.contentInsetAdjustmentBehavior = .never

        if(currentUrl.isEmpty == false){
            webViewModel.hasNewCommand = false
            webViewModel.url = URL(string:currentUrl)
        }
        
        if let url = webViewModel.url {
            webView.load(URLRequest(url: url))
        }
        webViewModel.assignWebView(webView: webView)
        return webView
    }

    func updateUIView(_ uiView: WKWebView, context: Context) {
    }

    class Coordinator: NSObject, WKNavigationDelegate, WKScriptMessageHandler {
        var parent: WebViewRepresentable

        var webView: WKWebView {
            parent.webView
        }
        var webViewModel: WebViewModel {
            parent.webViewModel
        }

        init(_ parent: WebViewRepresentable) {
            self.parent = parent
            super.init()

            // Add addScriptMessageHandler in javascript: window.webkit.messageHandlers.MyObserver.postMessage()
            webView.configuration.userContentController.add(self, name: "receiveData")
        }

        func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
            if navigationAction.navigationType == .linkActivated {
                if let url = navigationAction.request.url {
                    webView.load(URLRequest(url: url))
                    decisionHandler(.cancel)
                    return
                }
            }
            decisionHandler(.allow)
        }

        func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
            webViewModel.isLoading = true
        }

        func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
            webViewModel.isLoading = false
        }

        func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) {
            webViewModel.isLoading = false
            webViewModel.error = error
            print("loading error: \(error)")
        }

        func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
            let messageFromWebPage = message.body as! String

            let jsonData = messageFromWebPage.data(using: .utf8)!
            
            print(jsonData)

            do {
                let js2obj = try  JSONDecoder().decode(JS2SwiftModel.self, from: jsonData)
                webViewModel.jsParameter = js2obj.parameter
                webViewModel.jsCommand = js2obj.command
                
                webViewModel.hasNewCommand = true
                
                print(js2obj)
                
                print(webViewModel.jsCommand?.lowercased())
                
                switch webViewModel.jsCommand?.lowercased(){
                case "print":
                    
                    break
                case "tel":
                    
                    break
                case "clearcache":
                    
                    break
                case "setdefaultmember":
                    if let member_data  = webViewModel.jsParameter?.member_data {
                        Storage.shared.member_id = member_data.member_id ?? 0
                        Storage.shared.member_name = member_data.member_name ?? ""
                    }
                    break
                case "changeself":
                    if let dataSelf = webViewModel.jsParameter?.jsSelf {
                        Storage.shared.userid = dataSelf.user_id ?? 0
                        Storage.shared.mobile = dataSelf.user_mobile ?? ""
                        Storage.shared.email = dataSelf.user_email ?? ""
                        Storage.shared.username = dataSelf.username ?? ""
                    }
                    break
                case "goback":
                    

                    
                    break
                case "scanpaper":
                    

                    break
                case "logout":
                    Storage.shared.email = ""
                    Storage.shared.username = ""
                    Storage.shared.isLogin = false
                    Storage.shared.member_id = 0
                    Storage.shared.mobile = ""
                    Storage.shared.userid = 0
                    Storage.shared.usertoken = ""
                    Storage.shared.member_name = ""
                    
                    //can do this
                    parent.loginStatus.isLogin = false
                
                    break
                case "login":
                    Storage.shared.email = ""
                    Storage.shared.username = ""
                    Storage.shared.isLogin = false
                    Storage.shared.member_id = 0
                    Storage.shared.mobile = ""
                    Storage.shared.userid = 0
                    Storage.shared.usertoken = ""
                    Storage.shared.member_name = ""
                    
                    //can do this
                    parent.loginStatus.routeToLoginView = true
                    
                    break
                default:
                    break
                }
                
                

            }catch{
                print("error decoding json:\(error)")
            }
            
            
//            if messageFromWebPage == "index" {
//                viewModel.backButtonIsEnabled = false
//                viewModel.loadFile(name: messageFromWebPage)
//                return
//            }
//            if messageFromWebPage == "goPage" {
//                viewModel.backButtonIsEnabled = true
//                return
//            }
//
//            let alertController = UIAlertController(title: "Javascript said:", message: messageFromWebPage, preferredStyle: .alert)
//            let okAction = UIAlertAction(title: "OK", style: .default) { (_) in
//                print("OK")
//            }
//            alertController.addAction(okAction)
//            guard let windowScene = UIApplication.shared.connectedScenes.first as? UIWindowScene,
//                  let rootViewController = windowScene.windows.first?.rootViewController else {
//                return
//            }
//            rootViewController.present(alertController, animated: true)
            
            
            
            
        }
        
        
        /// Callback from javascript: window.webkit.messageHandlers.MyObserver.postMessage(message)
//        func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
//            let messageFromWebPage = message.body as! String
//
//            if messageFromWebPage == "index" {
//                viewModel.backButtonIsEnabled = false
//                viewModel.loadFile(name: messageFromWebPage)
//                return
//            }
//            if messageFromWebPage == "goPage" {
//                viewModel.backButtonIsEnabled = true
//                return
//            }
//
//            let alertController = UIAlertController(title: "Javascript said:", message: messageFromWebPage, preferredStyle: .alert)
//            let okAction = UIAlertAction(title: "OK", style: .default) { (_) in
//                print("OK")
//            }
//            alertController.addAction(okAction)
//            guard let windowScene = UIApplication.shared.connectedScenes.first as? UIWindowScene,
//                  let rootViewController = windowScene.windows.first?.rootViewController else {
//                return
//            }
//            rootViewController.present(alertController, animated: true)
//        }
        
        
    }
}