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package swagger;

import play.mvc.With;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.text.SimpleDateFormat;
import java.util.*;

public class SwaggerUtils {

{{#handleExceptions}}
    @With(ApiCall.class)
    @Target({ ElementType.TYPE, ElementType.METHOD })
    @Retention(RetentionPolicy.RUNTIME)
    public @interface ApiAction {
    }
{{/handleExceptions}}

    public static List parametersToList(String collectionFormat, String name, Object value){
        List params = new ArrayList<>();

        // preconditions
        if (name == null || name.isEmpty() || value == null) return params;

        Collection valueCollection = null;
        if (value instanceof Collection) {
            valueCollection = (Collection) value;
        } else {
            params.add(parameterToString(value));
            return params;
        }

        if (valueCollection.isEmpty()){
            return params;
        }

        // get the collection format
        collectionFormat = (collectionFormat == null || collectionFormat.isEmpty() ? "csv" : collectionFormat); // default: csv

        // create the params based on the collection format
        if (collectionFormat.equals("multi")) {
            for (Object item : valueCollection) {
                params.add(parameterToString(item));
            }

            return params;
        }

        String delimiter = ",";

        if (collectionFormat.equals("csv")) {
            delimiter = ",";
        } else if (collectionFormat.equals("ssv")) {
            delimiter = " ";
        } else if (collectionFormat.equals("tsv")) {
            delimiter = "\t";
        } else if (collectionFormat.equals("pipes")) {
            delimiter = "|";
        }

        StringBuilder sb = new StringBuilder() ;
        for (Object item : valueCollection) {
            sb.append(delimiter);
            sb.append(parameterToString(item));
        }

        params.add(sb.substring(1));

        return params;
    }

    public static String parameterToString(Object param) {
        if (param == null) {
            return "";
        } else if (param instanceof Date) {
            return formatDatetime((Date) param);
        } else if (param instanceof Collection) {
            StringBuilder b = new StringBuilder();
            for (Object o : (Collection)param) {
                if (b.length() > 0) {
                    b.append(",");
            }
            b.append(String.valueOf(o));
        }

        return b.toString();
        } else {
            return String.valueOf(param);
        }
    }

    public static String formatDatetime(Date date) {
    	return new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSXXX").format(date);
    }
}