import SwiftUI

// MARK: - Phone Input Component
struct PhoneInputView: View {
    @Binding var phoneNumber: String
    @Binding var message: String
    let inputType: PhoneInputType
    @FocusState var focusedField: PhoneField?
    
    // Phone input type enum
    enum PhoneInputType: String, CaseIterable {
        case phone = "Phone"
        case sms = "SMS"
        
        var displayName: String {
            switch self {
            case .phone: return "phone".localized
            case .sms: return "sms".localized
            }
        }
        
        var icon: String {
            switch self {
            case .phone: return "phone"
            case .sms: return "message"
            }
        }
        
        var placeholder: String {
            switch self {
            case .phone: return "phone_placeholder".localized
            case .sms: return "sms_placeholder".localized
            }
        }
        
        var hint: String {
            switch self {
            case .phone: return "enter_phone_number".localized
            case .sms: return "enter_sms_content".localized
            }
        }
    }
    
    // Phone field enum
    enum PhoneField: Hashable {
        case phoneNumber, message
    }
    
    var body: some View {
        VStack(spacing: 16) {
            // Type information
            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))
            )
            
            // Phone number (required)
            VStack(alignment: .leading, spacing: 8) {
                HStack {
                    Text("phone_number".localized)
                        .font(.subheadline)
                        .foregroundColor(.primary)
                    Text("*")
                        .foregroundColor(.red)
                    Spacer()
                }
                
                TextField("phone_placeholder".localized, text: $phoneNumber)
                    .textFieldStyle(RoundedBorderTextFieldStyle())
                    .keyboardType(.phonePad)
                    .focused($focusedField, equals: .phoneNumber)
            }
            
            // SMS content (SMS type only)
            if inputType == .sms {
                VStack(alignment: .leading, spacing: 8) {
                    HStack {
                        Text("sms_content".localized)
                            .font(.subheadline)
                            .foregroundColor(.primary)
                        Spacer()
                    }
                    
                    TextField("sms_placeholder".localized, text: $message)
                        .textFieldStyle(RoundedBorderTextFieldStyle())
                        .focused($focusedField, equals: .message)
                }
            }
            
            // Format instructions
            VStack(alignment: .leading, spacing: 8) {
                HStack {
                    Image(systemName: "info.circle")
                        .font(.caption)
                        .foregroundColor(.blue)
                    
                    Text("format_instructions".localized)
                        .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("done".localized) {
                    focusedField = nil
                }
                .foregroundColor(.blue)
                .font(.system(size: 16, weight: .medium))
            }
        }
    }
    
    private func getFormatHint() -> String {
        switch inputType {
        case .phone:
            return "phone_format_hint".localized
        case .sms:
            return "sms_format_hint".localized
        }
    }
}

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