import SwiftUI

// MARK: - 电话输入组件
struct PhoneInputView: View {
    @Binding var phoneNumber: String
    @Binding var message: String
    let inputType: PhoneInputType
    @FocusState var focusedField: PhoneField?
    
    // 电话输入类型枚举
    enum PhoneInputType: String, CaseIterable {
        case phone = "Phone"
        case sms = "SMS"
        
        var displayName: String {
            switch self {
            case .phone: return "电话"
            case .sms: return "短信"
            }
        }
        
        var icon: String {
            switch self {
            case .phone: return "phone"
            case .sms: return "message"
            }
        }
        
        var placeholder: String {
            switch self {
            case .phone: return "+1 (555) 123-4567"
            case .sms: return "输入短信内容"
            }
        }
        
        var hint: String {
            switch self {
            case .phone: return "输入电话号码，支持国际格式"
            case .sms: return "输入短信内容，将生成可发送的链接"
            }
        }
    }
    
    // 电话字段枚举
    enum PhoneField: Hashable {
        case phoneNumber, message
    }
    
    var body: some View {
        VStack(spacing: 16) {
            // 类型信息
            HStack {
                Image(systemName: inputType.icon)
                    .font(.title2)
                    .foregroundColor(.blue)
                
                VStack(alignment: .leading, spacing: 2) {
                    Text(inputType.displayName)
                        .font(.headline)
                        .foregroundColor(.primary)
                    
                    Text(inputType.hint)
                        .font(.caption)
                        .foregroundColor(.secondary)
                }
                
                Spacer()
            }
            .padding(.horizontal, 12)
            .padding(.vertical, 8)
            .background(
                RoundedRectangle(cornerRadius: 8)
                    .fill(Color.blue.opacity(0.1))
            )
            
            // 电话号码 (必填)
            VStack(alignment: .leading, spacing: 8) {
                HStack {
                    Text("电话号码")
                        .font(.subheadline)
                        .foregroundColor(.primary)
                    Text("*")
                        .foregroundColor(.red)
                    Spacer()
                }
                
                TextField("+1 (555) 123-4567", text: $phoneNumber)
                    .textFieldStyle(RoundedBorderTextFieldStyle())
                    .keyboardType(.phonePad)
                    .focused($focusedField, equals: .phoneNumber)
            }
            
            // 短信内容 (仅SMS类型)
            if inputType == .sms {
                VStack(alignment: .leading, spacing: 8) {
                    HStack {
                        Text("短信内容")
                            .font(.subheadline)
                            .foregroundColor(.primary)
                        Spacer()
                    }
                    
                    TextField("输入短信内容", text: $message)
                        .textFieldStyle(RoundedBorderTextFieldStyle())
                        .focused($focusedField, equals: .message)
                }
            }
            
            // 格式说明
            VStack(alignment: .leading, spacing: 8) {
                HStack {
                    Image(systemName: "info.circle")
                        .font(.caption)
                        .foregroundColor(.blue)
                    
                    Text("格式说明")
                        .font(.caption)
                        .foregroundColor(.primary)
                    
                    Spacer()
                }
                
                Text(getFormatHint())
                    .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))
            }
        }
    }
    
    private func getFormatHint() -> String {
        switch inputType {
        case .phone:
            return "• 支持国际格式：+1 (555) 123-4567\n• 或本地格式：(555) 123-4567\n• 将生成 tel: 链接"
        case .sms:
            return "• 输入电话号码和短信内容\n• 将生成 SMSTO: 链接\n• 用户点击可直接发送短信"
        }
    }
}

#Preview {
    PhoneInputView(
        phoneNumber: .constant(""),
        message: .constant(""),
        inputType: .phone
    )
}