import SwiftUI

// MARK: - 通用输入字段组件
struct InputFieldView: View {
    let title: String
    let isRequired: Bool
    let placeholder: String
    let text: Binding<String>
    let keyboardType: UIKeyboardType
    let autocapitalization: UITextAutocapitalizationType
    let icon: String?
    let isSecure: Bool
    let isFocused: Bool
    let onFocusChange: (Bool) -> Void
    
    init(
        title: String,
        isRequired: Bool = false,
        placeholder: String,
        text: Binding<String>,
        keyboardType: UIKeyboardType = .default,
        autocapitalization: UITextAutocapitalizationType = .sentences,
        icon: String? = nil,
        isSecure: Bool = false,
        isFocused: Bool = false,
        onFocusChange: @escaping (Bool) -> Void = { _ in }
    ) {
        self.title = title
        self.isRequired = isRequired
        self.placeholder = placeholder
        self.text = text
        self.keyboardType = keyboardType
        self.autocapitalization = autocapitalization
        self.icon = icon
        self.isSecure = isSecure
        self.isFocused = isFocused
        self.onFocusChange = onFocusChange
    }
    
    var body: some View {
        VStack(alignment: .leading, spacing: 8) {
            InputTitleView.required(title, icon: icon)
            
            Group {
                if isSecure {
                    SecureField(placeholder, text: text)
                } else {
                    TextField(placeholder, text: text)
                }
            }
            .textFieldStyle(RoundedBorderTextFieldStyle())
            .keyboardType(keyboardType)
            .autocapitalization(autocapitalization)
            .onTapGesture {
                onFocusChange(true)
            }
            .onChange(of: isFocused) { newValue in
                onFocusChange(newValue)
            }
        }
    }
}

// MARK: - 预定义的输入字段样式
extension InputFieldView {
    static func text(
        title: String,
        isRequired: Bool = false,
        placeholder: String,
        text: Binding<String>,
        icon: String? = nil,
        isFocused: Bool = false,
        onFocusChange: @escaping (Bool) -> Void = { _ in }
    ) -> InputFieldView {
        InputFieldView(
            title: title,
            isRequired: isRequired,
            placeholder: placeholder,
            text: text,
            icon: icon,
            isFocused: isFocused,
            onFocusChange: onFocusChange
        )
    }
    
    static func email(
        title: String,
        isRequired: Bool = false,
        placeholder: String,
        text: Binding<String>,
        icon: String? = nil,
        isFocused: Bool = false,
        onFocusChange: @escaping (Bool) -> Void = { _ in }
    ) -> InputFieldView {
        InputFieldView(
            title: title,
            isRequired: isRequired,
            placeholder: placeholder,
            text: text,
            keyboardType: .emailAddress,
            autocapitalization: .sentences,
            icon: icon,
            isFocused: isFocused,
            onFocusChange: onFocusChange
        )
    }
    
    static func phone(
        title: String,
        isRequired: Bool = false,
        placeholder: String,
        text: Binding<String>,
        icon: String? = nil,
        isFocused: Bool = false,
        onFocusChange: @escaping (Bool) -> Void = { _ in }
    ) -> InputFieldView {
        InputFieldView(
            title: title,
            isRequired: isRequired,
            placeholder: placeholder,
            text: text,
            keyboardType: .phonePad,
            icon: icon,
            isFocused: isFocused,
            onFocusChange: onFocusChange
        )
    }
    
    static func url(
        title: String,
        isRequired: Bool = false,
        placeholder: String,
        text: Binding<String>,
        icon: String? = nil,
        isFocused: Bool = false,
        onFocusChange: @escaping (Bool) -> Void = { _ in }
    ) -> InputFieldView {
        InputFieldView(
            title: title,
            isRequired: isRequired,
            placeholder: placeholder,
            text: text,
            keyboardType: .URL,
            autocapitalization: .sentences,
            icon: icon,
            isFocused: isFocused,
            onFocusChange: onFocusChange
        )
    }
    
    static func password(
        title: String,
        isRequired: Bool = false,
        placeholder: String,
        text: Binding<String>,
        icon: String? = nil,
        isFocused: Bool = false,
        onFocusChange: @escaping (Bool) -> Void = { _ in }
    ) -> InputFieldView {
        InputFieldView(
            title: title,
            isRequired: isRequired,
            placeholder: placeholder,
            text: text,
            icon: icon,
            isSecure: true,
            isFocused: isFocused,
            onFocusChange: onFocusChange
        )
    }
}

#Preview {
    VStack(spacing: 16) {
        InputFieldView.text(
            title: NSLocalizedString("username", comment: "Username"),
            isRequired: true,
            placeholder: NSLocalizedString("enter_username", comment: "Please enter username"),
            text: .constant(""),
            icon: "person"
        )
        
        InputFieldView.email(
            title: NSLocalizedString("email_address", comment: "Email address"),
            isRequired: true,
            placeholder: "user@example.com",
            text: .constant(""),
            icon: "envelope"
        )
        
        InputFieldView.phone(
            title: NSLocalizedString("phone_number", comment: "Phone number"),
            isRequired: true,
            placeholder: "+1 (555) 123-4567",
            text: .constant(""),
            icon: "phone"
        )
        
        InputFieldView.password(
            title: NSLocalizedString("password", comment: "Password"),
            isRequired: true,
            placeholder: NSLocalizedString("enter_password", comment: "Please enter password"),
            text: .constant(""),
            icon: "lock"
        )
    }
    .padding()
}