import SwiftUI

// MARK: - 地理位置输入组件
struct LocationInputView: View {
    @Binding var latitude: String
    @Binding var longitude: String
    @Binding var locationName: String
    @FocusState var focusedField: LocationField?
    
    // 地理位置字段枚举
    enum LocationField: Hashable {
        case latitude, longitude, locationName
    }
    
    var body: some View {
        VStack(spacing: 16) {
            // 位置名称
            VStack(alignment: .leading, spacing: 8) {
                HStack {
                    Text("位置名称")
                    .font(.subheadline)
                    .foregroundColor(.primary)
                    Spacer()
                }
                
                TextField("例如：纽约时代广场", text: $locationName)
                    .textFieldStyle(RoundedBorderTextFieldStyle())
                    .focused($focusedField, equals: .locationName)
            }
            
            // 坐标输入
            HStack(spacing: 12) {
                VStack(alignment: .leading, spacing: 8) {
                    HStack {
                        Text("纬度")
                            .font(.subheadline)
                            .foregroundColor(.primary)
                        Text("*")
                            .foregroundColor(.red)
                        Spacer()
                    }
                    
                    TextField("40.7589", text: $latitude)
                        .textFieldStyle(RoundedBorderTextFieldStyle())
                        .keyboardType(.decimalPad)
                        .focused($focusedField, equals: .latitude)
                }
                
                VStack(alignment: .leading, spacing: 8) {
                    HStack {
                        Text("经度")
                            .font(.subheadline)
                            .foregroundColor(.primary)
                        Text("*")
                            .foregroundColor(.red)
                        Spacer()
                    }
                    
                    TextField("-73.9851", text: $longitude)
                        .textFieldStyle(RoundedBorderTextFieldStyle())
                        .keyboardType(.decimalPad)
                        .focused($focusedField, equals: .longitude)
                }
            }
            
            // 坐标格式说明
            VStack(alignment: .leading, spacing: 8) {
                HStack {
                    Image(systemName: "info.circle")
                        .font(.caption)
                        .foregroundColor(.blue)
                    
                    Text("坐标格式说明")
                        .font(.caption)
                        .foregroundColor(.primary)
                    
                    Spacer()
                }
                
                Text("• 纬度范围：-90 到 90\n• 经度范围：-180 到 180\n• 使用小数点分隔，如：40.7589")
                    .font(.caption)
                    .foregroundColor(.secondary)
                    .lineLimit(nil)
            }
            .padding(.horizontal, 12)
            .padding(.vertical, 8)
            .background(
                RoundedRectangle(cornerRadius: 8)
                    .fill(Color.blue.opacity(0.1))
            )
        }
        .toolbar {
            ToolbarItemGroup(placement: .keyboard) {
                Spacer()
                Button("完成") {
                    focusedField = nil
                }
                .foregroundColor(.blue)
                .font(.system(size: 16, weight: .medium))
            }
        }
    }
}

#Preview {
    LocationInputView(
        latitude: .constant(""),
        longitude: .constant(""),
        locationName: .constant("")
    )
}