import SwiftUI

// MARK: - Calendar Event Input Component
struct CalendarInputView: View {
    @Binding var eventTitle: String
    @Binding var eventDescription: String
    @Binding var startDate: Date
    @Binding var endDate: Date
    @Binding var location: String
    @FocusState var focusedField: CalendarField?
    
    // Calendar field enum
    enum CalendarField: Hashable {
        case title, description, location
    }
    
    var body: some View {
        VStack(spacing: 16) {
            // Event title
            VStack(alignment: .leading, spacing: 8) {
                HStack {
                    Text("event_title".localized)
                        .font(.subheadline)
                        .foregroundColor(.primary)
                    Text("*")
                        .foregroundColor(.red)
                    Spacer()
                }
                
                TextField("event_title_placeholder".localized, text: $eventTitle)
                    .textFieldStyle(RoundedBorderTextFieldStyle())
                    .focused($focusedField, equals: .title)
            }
            
            // Event description
            VStack(alignment: .leading, spacing: 8) {
                HStack {
                    Text("event_description".localized)
                        .font(.subheadline)
                        .foregroundColor(.primary)
                    Spacer()
                }
                
                TextField("event_description_placeholder".localized, text: $eventDescription)
                    .textFieldStyle(RoundedBorderTextFieldStyle())
                    .focused($focusedField, equals: .description)
            }
            
            // Start time
            VStack(alignment: .leading, spacing: 8) {
                HStack {
                    Text("start_time".localized)
                        .font(.subheadline)
                        .foregroundColor(.primary)
                    Text("*")
                        .foregroundColor(.red)
                    Spacer()
                }
                
                DatePicker("start_time".localized, selection: $startDate, displayedComponents: [.date, .hourAndMinute])
                    .datePickerStyle(CompactDatePickerStyle())
                    .labelsHidden()
            }
            
            // End time
            VStack(alignment: .leading, spacing: 8) {
                HStack {
                    Text("end_time".localized)
                        .font(.subheadline)
                        .foregroundColor(.primary)
                    Text("*")
                        .foregroundColor(.red)
                    Spacer()
                }
                
                DatePicker("end_time".localized, selection: $endDate, displayedComponents: [.date, .hourAndMinute])
                    .datePickerStyle(CompactDatePickerStyle())
                    .labelsHidden()
            }
            
            // Location
            VStack(alignment: .leading, spacing: 8) {
                HStack {
                    Text("event_location".localized)
                        .font(.subheadline)
                        .foregroundColor(.primary)
                    Spacer()
                }
                
                TextField("event_location_placeholder".localized, text: $location)
                    .textFieldStyle(RoundedBorderTextFieldStyle())
                    .focused($focusedField, equals: .location)
            }
            
            // Time validation hint
            if endDate <= startDate {
                VStack(alignment: .leading, spacing: 8) {
                    HStack {
                        Image(systemName: "exclamationmark.triangle")
                            .font(.caption)
                            .foregroundColor(.orange)
                        
                        Text("time_setting_hint".localized)
                            .font(.caption)
                            .foregroundColor(.primary)
                        
                        Spacer()
                    }
                    
                    Text("end_time_must_be_after_start_time".localized)
                        .font(.caption)
                        .foregroundColor(.orange)
                }
                .padding(.horizontal, 12)
                .padding(.vertical, 8)
                .background(
                    RoundedRectangle(cornerRadius: 8)
                        .fill(Color.orange.opacity(0.1))
                )
            }
        }
        .toolbar {
            ToolbarItemGroup(placement: .keyboard) {
                Spacer()
                Button("complete".localized) {
                    focusedField = nil
                }
                .foregroundColor(.blue)
                .font(.system(size: 16, weight: .medium))
            }
        }
        .onAppear {
            // 设置默认时间
            if startDate == Date() {
                startDate = Date()
                endDate = Calendar.current.date(byAdding: .hour, value: 1, to: startDate) ?? startDate
            }
        }
    }
}

#Preview {
    CalendarInputView(
        eventTitle: .constant(""),
        eventDescription: .constant(""),
        startDate: .constant(Date()),
        endDate: .constant(Calendar.current.date(byAdding: .hour, value: 1, to: Date()) ?? Date()),
        location: .constant("")
    )
}