import SwiftUI

// MARK: - 条形码验证信息显示组件
struct BarcodeValidationInfoView: View {
    let validationResult: BarcodeValidator.ValidationResult?
    let barcodeType: BarcodeType
    
    var body: some View {
        VStack(alignment: .leading, spacing: 8) {
            if let result = validationResult {
                // 验证状态指示器
                HStack(spacing: 8) {
                    Image(systemName: result.isValid ? "checkmark.circle.fill" : "xmark.circle.fill")
                        .foregroundColor(result.isValid ? .green : .red)
                    
                    Text(result.isValid ? "格式正确" : "格式错误")
                        .font(.caption)
                        .foregroundColor(result.isValid ? .green : .red)
                        .fontWeight(.medium)
                    
                    Spacer()
                }
                
                // 错误信息
                if let errorMessage = result.errorMessage {
                    Text(errorMessage)
                        .font(.caption)
                        .foregroundColor(.red)
                        .padding(.leading, 24)
                }
                
                // 格式要求信息
                VStack(alignment: .leading, spacing: 4) {
                    if let expectedLength = result.expectedLength {
                        HStack {
                            Image(systemName: "number")
                                .foregroundColor(.blue)
                                .font(.caption)
                            Text("长度要求: \(expectedLength) 位")
                                .font(.caption)
                                .foregroundColor(.blue)
                        }
                    }
                    
                    if let allowedCharacters = result.allowedCharacters {
                        HStack {
                            Image(systemName: "character")
                                .foregroundColor(.blue)
                                .font(.caption)
                            Text("允许字符: \(allowedCharacters)")
                                .font(.caption)
                                .foregroundColor(.blue)
                        }
                    }
                }
                .padding(.leading, 24)
                
                // 格式化后的内容
                if result.isValid && result.formattedContent != "" {
                    HStack {
                        Image(systemName: "textformat")
                            .foregroundColor(.green)
                            .font(.caption)
                        Text("格式化: \(result.formattedContent)")
                            .font(.caption)
                            .foregroundColor(.green)
                            .fontWeight(.medium)
                    }
                    .padding(.leading, 24)
                }
            } else {
                // 默认提示信息
                HStack {
                    Image(systemName: "info.circle")
                        .foregroundColor(.blue)
                        .font(.caption)
                    Text("请输入符合 \(barcodeType.displayName) 格式的内容")
                        .font(.caption)
                        .foregroundColor(.blue)
                }
            }
        }
        .padding(12)
        .background(
            RoundedRectangle(cornerRadius: 8)
                .fill(Color(.systemGray6))
        )
    }
}

#Preview {
    VStack(spacing: 20) {
        // 有效格式示例
        BarcodeValidationInfoView(
            validationResult: BarcodeValidator.ValidationResult(
                isValid: true,
                formattedContent: "123 4567 8901 2",
                errorMessage: nil,
                expectedLength: 13,
                allowedCharacters: "数字 (0-9)"
            ),
            barcodeType: .ean13
        )
        
        // 无效格式示例
        BarcodeValidationInfoView(
            validationResult: BarcodeValidator.ValidationResult(
                isValid: false,
                formattedContent: "12345",
                errorMessage: "EAN-13必须是13位数字",
                expectedLength: 13,
                allowedCharacters: "数字 (0-9)"
            ),
            barcodeType: .ean13
        )
        
        // 默认状态示例
        BarcodeValidationInfoView(
            validationResult: nil,
            barcodeType: .code39
        )
    }
    .padding()
}