import SwiftUI

#if canImport(WebKit)
import WebKit

struct WebLoginView: View {
    @Environment(\.dismiss) private var dismiss
    @State private var isLoading = true

    var body: some View {
        NavigationStack {
            ZStack {
                WebLoginRepresentable(
                    url: URL(string: "https://ddys.io")!,
                    isLoading: $isLoading,
                    onCookiesExtracted: { cookies in
                        CookieManager.shared.cookieString = cookies
                        dismiss()
                    }
                )

                if isLoading {
                    ProgressView("加载中...")
                }
            }
            .navigationTitle("登录 DDYS")
            #if os(iOS)
            .navigationBarTitleDisplayMode(.inline)
            #endif
            .toolbar {
                ToolbarItem(placement: .cancellationAction) {
                    Button("取消") { dismiss() }
                }
                ToolbarItem(placement: .confirmationAction) {
                    Button("提取 Cookie") {
                        // 通知 WebView 提取 cookies
                        NotificationCenter.default.post(name: .extractCookies, object: nil)
                    }
                }
            }
        }
    }
}

extension Notification.Name {
    static let extractCookies = Notification.Name("extractCookies")
}

#if os(iOS)
struct WebLoginRepresentable: UIViewRepresentable {
    let url: URL
    @Binding var isLoading: Bool
    let onCookiesExtracted: (String) -> Void

    func makeUIView(context: Context) -> WKWebView {
        let config = WKWebViewConfiguration()
        let webView = WKWebView(frame: .zero, configuration: config)
        webView.navigationDelegate = context.coordinator
        webView.load(URLRequest(url: url))

        NotificationCenter.default.addObserver(
            context.coordinator,
            selector: #selector(Coordinator.extractCookies),
            name: .extractCookies,
            object: nil
        )
        return webView
    }

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

    func makeCoordinator() -> Coordinator {
        Coordinator(parent: self)
    }

    class Coordinator: NSObject, WKNavigationDelegate {
        let parent: WebLoginRepresentable
        weak var webView: WKWebView?

        init(parent: WebLoginRepresentable) {
            self.parent = parent
        }

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

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

        @objc func extractCookies() {
            guard let webView else { return }
            webView.configuration.websiteDataStore.httpCookieStore.getAllCookies { cookies in
                let ddysCookies = cookies
                    .filter { $0.domain.contains("ddys") }
                    .map { "\($0.name)=\($0.value)" }
                    .joined(separator: "; ")

                DispatchQueue.main.async {
                    self.parent.onCookiesExtracted(ddysCookies)
                }
            }
        }
    }
}
#else
struct WebLoginRepresentable: NSViewRepresentable {
    let url: URL
    @Binding var isLoading: Bool
    let onCookiesExtracted: (String) -> Void

    func makeNSView(context: Context) -> WKWebView {
        let config = WKWebViewConfiguration()
        let webView = WKWebView(frame: .zero, configuration: config)
        webView.navigationDelegate = context.coordinator
        webView.load(URLRequest(url: url))

        NotificationCenter.default.addObserver(
            context.coordinator,
            selector: #selector(Coordinator.extractCookies),
            name: .extractCookies,
            object: nil
        )
        return webView
    }

    func updateNSView(_ nsView: WKWebView, context: Context) {}

    func makeCoordinator() -> Coordinator {
        Coordinator(parent: self)
    }

    class Coordinator: NSObject, WKNavigationDelegate {
        let parent: WebLoginRepresentable
        weak var webView: WKWebView?

        init(parent: WebLoginRepresentable) {
            self.parent = parent
        }

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

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

        @objc func extractCookies() {
            guard let webView else { return }
            webView.configuration.websiteDataStore.httpCookieStore.getAllCookies { cookies in
                let ddysCookies = cookies
                    .filter { $0.domain.contains("ddys") }
                    .map { "\($0.name)=\($0.value)" }
                    .joined(separator: "; ")

                DispatchQueue.main.async {
                    self.parent.onCookiesExtracted(ddysCookies)
                }
            }
        }
    }
}
#endif
#endif