package com.onaro.sanscreen.client.view.annotations;

import java.text.Collator;
import java.util.ArrayList;
import java.util.Collection;

import org.apache.commons.lang3.StringUtils;

import com.onaro.commons.util.SwingCollectionPrinter;
import com.onaro.sanscreen.server.interfaces.data.inventory.AutoTierPolicyConstraint;

/**
 * Class containing miscellaneous methods working with AutoTierPolicy objects.
 */
public class AutoTierPolicyUtils {
	/*
	 * Printer used to construct a single string from a set of policy constraints.
	 */
    private static SwingCollectionPrinter<AutoTierPolicyConstraintHolder> printer = new SwingCollectionPrinter<AutoTierPolicyConstraintHolder>();
    
    /**
     * Return a string representation (suitable for the UI) of a Collection of AutoTierPolicyConstraints.  The output string would 
     * be a comma-separated list of constraints where of the format "<limitPercent>% <vendorTierName>, ...".  For example: "75% Gold, 25% Silver"
     * 
     * @return a string representation (suitable for the UI) of a Collection of AutoTierPolicyConstraints.
     */
    public static final String toString(Collection<AutoTierPolicyConstraint> constraints) {
        if(constraints != null && constraints.size() > 0) {
            Collection<AutoTierPolicyConstraintHolder> constraintHolders = new ArrayList<AutoTierPolicyConstraintHolder>(constraints.size());
            
            /* Create a collection of AutoTierPolicyConstraintHolder objects for the SwingCollectionPrinter to use.  We need this since the 
             * AutoTierPolicyConstraint object is a server object and we don't have control over its toString() method that SwingCollectionPrinter uses.
             */
            for(AutoTierPolicyConstraint constraint : constraints) {
                constraintHolders.add(new AutoTierPolicyConstraintHolder(constraint));
            }
            return(printer.toStringNoSort(constraintHolders));
        }
        else {
            return StringUtils.EMPTY;
        }
    }
    
    /**
     * @return a string representation (suitable for the UI) of a AutoTierPolicyConstraint. The format of the output string is: xx% <vendorTierName>.
     * For example, "75% Gold".
     */
    public static final String toString(AutoTierPolicyConstraint constraint) {
        return(new AutoTierPolicyConstraintHolder(constraint).toString());
    }
    
    /**
     * Returns the policy name without any constraints in the string.  The input string would be something like "<policyName>(75% Gold, 25% Silver)".
     * This would return "<policyName>".  For example: "My Gold Policy(75% Gold, 25% Silver)" becomes "My Gold Policy".
     * 
     * @param policyNameWithConstraints a string containing the policy name followed optionally by the constraints details.
     * 
     * @return the policy name without any constraints in the string.
     */
    public static final String getPolicyName(String policyNameWithConstraints) {
        return(StringUtils.substringBefore(policyNameWithConstraints, "(")); //$NON-NLS-1$
    }
    
    /*
     * Class that is used to contain a DynamicPolicyConstraint.  This class implements Comparable and provides a toString()
     * method so that DynamicPolicyConstraint objects can be formatted by our SwingCollectionPrinter class.
     */
    private static class AutoTierPolicyConstraintHolder implements Comparable<AutoTierPolicyConstraintHolder> {
        private AutoTierPolicyConstraint constraint;
        
        public AutoTierPolicyConstraintHolder(AutoTierPolicyConstraint constraint) {
            this.constraint = constraint;
        }

        @Override
        public int compareTo(AutoTierPolicyConstraintHolder constraintHolder) {
            // Sort in natural language order.
            return Collator.getInstance().compare(constraint.getVendorTier(), constraintHolder.constraint.getVendorTier());
        }
        
        @Override
        /**
         * Override used by SwingCollectionPrinter to construct values for a policy constraint.  The format of the output string is: xx% <vendorTierName>.
         * For example, "75% Gold".
         */
        public String toString() {
            StringBuilder str = new StringBuilder();
            
            str.append(constraint.getLimitPercent());
            str.append('%');
            str.append(' ');
            str.append(constraint.getVendorTier());
            
            return(str.toString());
        }
    }
}