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package javax.faces.validator;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import javax.faces.context.FacesContext;
import static javax.faces.validator.BeanValidator.ENABLE_VALIDATE_WHOLE_BEAN_PARAM_NAME;
import static javax.faces.validator.BeanValidator.VALIDATOR_ID;
import javax.validation.groups.Default;

class MultiFieldValidationUtils {
    
    static final String MULTI_FIELD_VALIDATION_CANDIDATES =
            VALIDATOR_ID + ".MULTI_FIELD_VALIDATION_CANDIDATES";
    
    /**
     * Special value to indicate the proposed value
     * for a property failed field-level validation.  This prevents any attempt
     * to perform class level validation.
     */
    static final String FAILED_FIELD_LEVEL_VALIDATION = VALIDATOR_ID + ".FAILED_FIELD_LEVEL_VALIDATION";
    
    
   /*
    * Returns a data structure that stores
    * the information necessary to perform class-level validation by
    * <f:validateWholeBean > components elsewhere in
    * the tree.  The lifetime of this data structure does not extend
    * beyond the current {@code FacesContext}.  The data structure must
    * conform to the following specification.
    * 
    * 
    * 
    * 
    * 
    * It is a non-thread-safe {@code Map}.
    * 
    * Keys are CDI bean instances that are referenced by the
    * {@code value} attribute of <f:validateWholeBean
    * > components.
    * 
    * 
    * 
    * Values are {@code Map}s that represent the properties to be stored 
    * on the CDI bean instance that is the current key.  The inner {@code Map}
    * must conform to the following specification.
    * 
    * 
    * 
    * It is a non-thread-safe {@code Map}.
    * 
    * Keys are property names.
    * 
    * Values are {@code Map} instances. In this innermost map, the following keys are supported. 
    *
    * component: Object that is the EditableValueHolder
    * value: Object that is the value of the property
    *
    * 
    * 
    * 
    * 
    * 
    * 
    * 
    * 
    * 
    * 
    * 
    * 
    * @param context the {@link FacesContext} for this request
    * 
    * @param create if {@code true}, the data structure must be created if not present.
    * If {@code false} the data structure must not be created and {@code Collections.emptyMap()}
    * must be returned.
    *
    * @return the data structure representing the multi-field validation candidates
    * 
    * @since 2.3
    */
    static Map>> getMultiFieldValidationCandidates(FacesContext context, boolean create) {
        Map attrs = context.getAttributes();
        Map>> result;
        result = (Map>>) attrs.get(MULTI_FIELD_VALIDATION_CANDIDATES);
        if (null == result) {
            if (create) {
                result = new HashMap<>();
                attrs.put(MULTI_FIELD_VALIDATION_CANDIDATES, result);
            } else {
                result = Collections.emptyMap();
            } 
        }
        
        return result;
    }
    
    static boolean wholeBeanValidationEnabled(FacesContext context, 
            Class [] validationGroupsArray) {
        boolean result;
        
        Map attrs = context.getAttributes();
        if (!(attrs.containsKey(ENABLE_VALIDATE_WHOLE_BEAN_PARAM_NAME) &&
             (Boolean)attrs.get(ENABLE_VALIDATE_WHOLE_BEAN_PARAM_NAME))) { // NOPMD
            return false;
        }
        
        result = !(1 == validationGroupsArray.length && Default.class == validationGroupsArray[0]);
        
        return result;
    }
    
            

}