import SwiftUI

struct SearchView: View {
    @State private var searchQuery: String = ""
    @State private var searchResults: [AlbumItem] = []
    @State private var isSearching: Bool = false
    @State private var showAlert: Bool = false
    @State private var alertMessage: String = ""

    var body: some View {
        Form {
            Section(header: Text("搜索")) {
                HStack {
                    TextField("输入搜索内容", text: $searchQuery)
                        .textFieldStyle(RoundedBorderTextFieldStyle())
                    
                    Button(action: performSearch) {
                        if isSearching {
                            ProgressView()
                        } else {
                            Image(systemName: "magnifyingglass")
                        }
                    }
                    .disabled(searchQuery.isEmpty || isSearching)
                }
            }
            
            if !searchResults.isEmpty {
                Section(header: Text("搜索结果")) {
                    ForEach(searchResults, id: \.album_id) { item in
                        NavigationLink(destination: PhotoView(albumId: item.album_id)) {
                            VStack(alignment: .leading) {
                                Text(item.title)
                                    .font(.headline)
                                Text("ID: \(item.album_id)")
                                    .font(.subheadline)
                                    .foregroundColor(.gray)
                            }
                        }
                    }
                }
            }
        }
        .alert(isPresented: $showAlert) {
            Alert(title: Text("提示"), message: Text(alertMessage), dismissButton: .default(Text("确定")))
        }
    }
    
    private func performSearch() {
        guard !searchQuery.isEmpty else { return }
        
        isSearching = true
        searchResults = []
        
        let encodedQuery = searchQuery.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) ?? searchQuery
        let urlString = "https://jms.godserver.cn/search/?search_query=\(encodedQuery)&page=1"
        
        guard let url = URL(string: urlString) else {
            showAlert(message: "无效的URL")
            isSearching = false
            return
        }
        
        let task = URLSession.shared.dataTask(with: url) { data, response, error in
            DispatchQueue.main.async {
                self.isSearching = false
                
                if let error = error {
                    self.showAlert(message: "搜索失败: \(error.localizedDescription)")
                    return
                }
                
                guard let httpResponse = response as? HTTPURLResponse, httpResponse.statusCode == 200 else {
                    self.showAlert(message: "服务器返回错误")
                    return
                }
                
                guard let data = data else {
                    self.showAlert(message: "没有接收到数据")
                    return
                }
                
                do {
                    let decoder = JSONDecoder()
                    self.searchResults = try decoder.decode([AlbumItem].self, from: data)
                } catch {
                    print("解码错误: \(error)")
                    self.showAlert(message: "解析数据失败: \(error.localizedDescription)")
                }
            }
        }
        task.resume()
    }
    private func showAlert(message: String) {
        alertMessage = message
        showAlert = true
    }
}