import SwiftUI
import UIKit

struct AboutUsView: View {
    // MARK: - Properties
    
    private let appVersion = Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String ?? "1.0.0"
    private let buildNumber = Bundle.main.infoDictionary?["CFBundleVersion"] as? String ?? "1"
    
    // MARK: - Body
    
    var body: some View {
        ZStack {
            // Background color
            Color.themeTextWhiteSecondary
                .edgesIgnoringSafeArea(.all)
            
            VStack(spacing: 0) {
                // Navigation Header
                SimpleNaviHeader(title: "About Us") {
                    Router.shared.pop()
                }
                .padding(.top, UIApplication.shared.windows.first?.safeAreaInsets.top ?? 0)
                
                // Main Content
                VStack(spacing: 0) {
                    // IP Address Section
                    VStack(spacing: 12) {
                        if let icon = primaryAppIconUIImage() {
                            Image(uiImage: icon)
                                .resizable()
                                .aspectRatio(contentMode: .fit)
                                .frame(width: 102, height: 102)
                                .cornerRadius(18)
                        } else {
                            Image(systemName: "app.fill")
                                .resizable()
                                .aspectRatio(contentMode: .fit)
                                .frame(width: 82, height: 82)
                                .foregroundColor(.gray)
                        }
                    }
                    .frame(maxWidth: .infinity)
                    .padding(.vertical, 32)
                    
                    // Version & ICP Info
                    VStack(spacing: 12) {
                        Text("Version : 1.1.1")
                            .font(.system(size: 12))
                            .foregroundColor(.themeTextMessageMain)
                        
                        Text("ICP 备案号: 京ICP备XXXXXXXX号")
                            .font(.system(size: 12))
                            .foregroundColor(.themeTextMessageMain)
                    }
                    .padding(.bottom, 32)
                    // Legal Links
                    VStack(spacing: 0) {
                        settingRow(
                            title: "Terms of Service",
                            action: {
                                withAnimation {
                                    if let url = URL(string: "https://memorywake.com/privacy-policy") {
                                        UIApplication.shared.open(url)
                                    }
                                }
                            }
                        )
                        .padding()
                        settingRow(
                            title: "Privacy Policy",
                            action: {
                                withAnimation {
                                    if let url = URL(string: "https://memorywake.com/privacy-policy") {
                                        UIApplication.shared.open(url)
                                    }
                                }
                            }
                        )
                        .padding()
                        settingRow(
                            title: "AI Usage Guidelines",
                            action: {
                                withAnimation {
                                    if let url = URL(string: "https://memorywake.com/privacy-policy") {
                                        UIApplication.shared.open(url)
                                    }
                                }
                            }
                        )
                        .padding()
                    }  
                }
                .frame(maxWidth: .infinity)
                .background(Color.white)
                .cornerRadius(16)
                .padding()
                Spacer()
            }
        }
        .navigationBarHidden(true)
        .edgesIgnoringSafeArea(.all)
    }
    
    private func settingRow(title: String, action: @escaping () -> Void) -> some View {
        Button(action: action) {
            HStack {
                // 标题
                Text(title)
                    .foregroundColor(.primary)
                
                Spacer()
                
                // 右侧箭头
                Image(systemName: "chevron.right")
                    .font(.system(size: 14))
                    .foregroundColor(.gray)
            }
            .padding(.vertical, 12)  // 增加垂直内边距
            .background(Color.white)
        }
        .buttonStyle(PlainButtonStyle())
        .listRowBackground(Color.white)
        .listRowSeparator(.hidden)
    }
    // MARK: - Private Methods
    
    private func primaryAppIconUIImage() -> UIImage? {
        // 获取主 AppIcon 名称列表中最后一个（通常是最大尺寸）
        if let iconsDictionary = Bundle.main.infoDictionary?["CFBundleIcons"] as? [String: Any],
           let primaryIconsDictionary = iconsDictionary["CFBundlePrimaryIcon"] as? [String: Any],
           let iconFiles = primaryIconsDictionary["CFBundleIconFiles"] as? [String],
           let lastIcon = iconFiles.last,
           let image = UIImage(named: lastIcon) {
            return image
        }
        return nil
    }

    private func getIPAddress() -> String? {
        var address: String?
        var ifaddr: UnsafeMutablePointer<ifaddrs>?
        
        if getifaddrs(&ifaddr) == 0 {
            var ptr = ifaddr
            while ptr != nil {
                defer { ptr = ptr?.pointee.ifa_next }
                
                let interface = ptr?.pointee
                let addrFamily = interface?.ifa_addr.pointee.sa_family
                
                if addrFamily == UInt8(AF_INET) || addrFamily == UInt8(AF_INET6),
                   let name = interface?.ifa_name,
                   String(cString: name) == "en0",
                   let addr = interface?.ifa_addr {
                    
                    var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
                    getnameinfo(addr, socklen_t(addr.pointee.sa_len),
                               &hostname, socklen_t(hostname.count),
                               nil, socklen_t(0),
                               NI_NUMERICHOST)
                    address = String(cString: hostname)
                }
            }
            freeifaddrs(ifaddr)
        }
        
        return address
    }
}

// MARK: - Preview
#Preview {
    AboutUsView()
}

// MARK: - Dependencies
import Foundation
import SystemConfiguration
import Network
import Darwin