package com.example.component.validator;

import java.io.Serializable;
import java.util.List;

import javax.faces.component.FacesComponent;
import javax.faces.component.UIInput;
import javax.faces.context.FacesContext;

import org.omnifaces.component.validator.ValidateMultipleFields;

@FacesComponent(MinMaxSelectionValidator.COMPONENT_TYPE)
public class MinMaxSelectionValidator extends ValidateMultipleFields {

    public static final String COMPONENT_TYPE = "com.example.component.validator.MinMaxSelectionValidator";

    public static final String DEFAULT_MESSAGE = "You have to select between {0} and {1} values";

    private enum PropertyKeys {
        min, max
    }

    private static final int DEFAULT_MIN = 0;
    private static final int DEFAULT_MAX = -1;

    public MinMaxSelectionValidator() {
        super(DEFAULT_MESSAGE);
    }

    @Override
    protected boolean validateValues(FacesContext fc, List<UIInput> components,
            List<Object> values) {

        int countSelected = 0;
        if (values != null) {
            for (Object value : values) {
                if (value instanceof Boolean) {
                    if (((Boolean)value) == true) {
                        countSelected ++;
                    }
                } else if (value instanceof String) {
                    if (((String)value).equals("true")) {
                        countSelected ++;
                    }
                }
            }
        }

        if (countSelected < getMin() || countSelected > getMax()) {
            return false;
        }

        return true;
    }

    public int getMin() {
        return (Integer)getStateHelper().eval(PropertyKeys.min, DEFAULT_MIN);
    }

    public void setMin(int min) {
        getStateHelper().put(PropertyKeys.min, min);
    }

    public int getMax() {
        return (Integer)getStateHelper().eval(PropertyKeys.max, DEFAULT_MAX);
    }

    public void setMax(int max) {
        getStateHelper().put(PropertyKeys.max, max);
    }

}