/*
 * [CurrCon.java]
 *
 * Summary: Generate a CurrCon currency conversion.
 *
 * Copyright: (c) 2009-2017 Roedy Green, Canadian Mind Products, http://mindprod.com
 *
 * Licence: This software may be copied and used freely for any purpose but military.
 *          http://mindprod.com/contact/nonmil.html
 *
 * Requires: JDK 1.8+
 *
 * Created with: JetBrains IntelliJ IDEA IDE http://www.jetbrains.com/idea/
 *
 * Version History:
 *  1.8 2009-02-06 include go package in ZIP bundle.
 */
package com.mindprod.htmlmacros.macro;

import com.mindprod.common18.ST;
import com.mindprod.currcon.Geom;
import com.mindprod.fastcat.FastCat;
import com.mindprod.htmlmacros.support.Tools;

import static com.mindprod.currcon.Geom.*;
import static com.mindprod.htmlmacros.macro.Global.configuration;
import static java.lang.System.*;

/**
 * Generate a CurrCon currency conversion.
 *
 * @author Roedy Green, Canadian Mind Products
 * @version 1.8 2009-02-06 include go package in ZIP bundle.
 * @see com.mindprod.htmlmacros.macro.CMPApplet
 * @since 2009
 */
public final class CurrCon extends Macro
    {
    /**
     * suffix for a tag
     */
    private static final String TAG_TAIL = configuration.getTagTail();

    /**
     * how to use the macro
     */
    private static final String USAGE = "\ntry <!-- macro CurrCon $AcN USD 10.00 -->";

    /**
     * set true to add instance parms to help debug CurrCon
     */
    private static final boolean GENERATE_INSTANCE = false;

    /**
     * generate code for people who have no java
     *
     * @param currency e.g. USD CAD
     * @param amount   amount in that currency, e.g. 10.00
     *
     * @return generated HTML
     */
    private static String noJava( String currency, String amount )
        {
        if ( amount.length() == 0 )
            {
            return "CurrCon Applet needs Java 1.8 or later to display prices in your local currency.";
            }
        final FastCat sb = new FastCat( 4 );
        // display for people without java. Values will not change.
        if ( currency.equals( "USD" ) || currency.equals( "CAD" ) )
            {
            sb.append( "$" );
            }
        else if ( currency.equals( "EUR" ) )
            {
            sb.append( "&euro;" );
            }
        sb.append( amount );
        sb.append( " " );
        sb.append( currency );
        return sb.toString();
        }

    /**
     * @param show     which field to show, e.g. c$AN
     * @param currency base currency country usually USD, CAD, EUR
     * @param amount   amount as a string e.g. 10.00
     *
     * @return expanded macro HTML
     */
    private String expand( String show, String currency, String amount )
        {
        /* calculate width needed */
        // how many pixels wide the Applet needs to be.
        // Applets can't change their space allocation.
        int width = 0;
        boolean showSymbols = false;
        for ( int i = 0; i < show.length(); i++ )
            {
            char c = show.charAt( i );
            switch ( c )
                {
                case '$':
                    showSymbols = true;
                    break;
                case 'A':
                    width += COMPACT_AMOUNT_DISPLAY_WIDTH;
                    if ( showSymbols )
                        {
                        width += SYMBOL_DISPLAY_WIDTH;
                        }
                    break;
                case 'c':
                    /* add a currency code selector */
                    width += CURR_CODE_SELECT_WIDTH;
                    break;
                case 'C':
                    /*
                     * add a currency code display, you can't change, except via
                     * a corresponding c somewhere
                     */
                    width += CURR_CODE_DISPLAY_WIDTH;
                    break;
                case 'N':
                    /* add a currency name display */
                    width += CURR_NAME_DISPLAY_WIDTH;
                    break;
                case 'P':
                    width += PRECISE_AMOUNT_DISPLAY_WIDTH;
                    if ( showSymbols )
                        {
                        width += SYMBOL_DISPLAY_WIDTH;
                        }
                    break;
                case 'I':
                default:
                    throw new IllegalArgumentException(
                            "invalid show parameter " + show );
                } // end switch
            } // end for
        if ( configuration.isUsingHTML5( fileBeingDistributed ) )
            {
            return expandUsingHTML5( show, currency, amount, width );
            }
        else
            {
            return expandUsingHTML4( show, currency, amount, width );
            }
        } // end expandNoRef

    private String expandUsingHTML4( final String show, final String currency, final String amount, final int width )
        {
        final FastCat sb = new FastCat( 25 );
        sb.append( "<applet class=\"currcon\" archive=\"" );
        sb.append( Tools.relativeURL( "applet/currcon.jar", fileBeingDistributed ) );
        sb.append( "\" code=\"com.mindprod.currcon.CurrCon\" width=\"" );
        sb.append( width );
        sb.append( "\" height=\"20\" align=\"middle\" alt=\"" );
        sb.append( noJava( currency, amount ) );
        sb.append( "\">" );
        sb.append( "<param name=\"geom\" value=\"" );
        sb.append( Geom.serialVersionUID ); // for consistency check.
        sb.append( "\"" );
        sb.append( TAG_TAIL );
        sb.append( "<param name=\"show\" value=\"" );
        sb.append( show );
        sb.append( "\"" );
        sb.append( TAG_TAIL );
        if ( currency.length() != 0 )
            {
            sb.append( "<param name=\"currency\" value=\"" );
            sb.append( currency );
            sb.append( "\"" );
            sb.append( TAG_TAIL );
            }
        if ( amount.length() != 0 )
            {
            sb.append( "<param name=\"amount\" value=\"" );
            sb.append( amount );
            sb.append( "\"" );
            sb.append( TAG_TAIL );
            }
        sb.append( noJava( currency, amount ) );
        sb.append( "\n</applet>" );
        return sb.toString();
        }

    private String expandUsingHTML5( final String show, final String currency, final String amount, final int width )
        {
        final FastCat sb = new FastCat( 31 );
        sb.append( "<object class=\"currcon\" type=\"application/x-java-applet\"" );
        sb.append( " data=\"", Tools.relativeURL( "applet/currcon.jar", fileBeingDistributed ), "\"" );
        sb.append( " typemustmatch" );
        sb.append( " width=\"", width, "\" height=\"20\">\n" );
        sb.append( "<param name=\"code\" value=\"com.mindprod.currcon.CurrCon\">\n" );
        sb.append( "<param name=\"archive\" value=\"", Tools.relativeURL( "applet/currcon.jar", fileBeingDistributed ), "\">\n" );
        sb.append( "<param name=\"geom\" value=\"", Geom.serialVersionUID, "\">\n" );
        sb.append( "<param name=\"show\" value=\"", show, "\">\n" );
        if ( GENERATE_INSTANCE )
            {
            sb.append( "<param name=\"instance\" value=\"", Macro.getUniqueOnPage(), "\">\n" );
            }
        if ( currency.length() != 0 )
            {
            sb.append( "<param name=\"currency\" value=\"", currency, "\">\n" );
            }
        if ( amount.length() != 0 )
            {
            sb.append( "<param name=\"amount\" value=\"", amount, "\">\n" );
            }
        sb.append( noJava( currency, amount ) );
        sb.append( "</object>\n" );
        return sb.toString();
        }

    /**
     * Generate a CurrCon currency conversion. expands <!-- macro CurrCon c$AN USD 10.00 ../ -->
     *
     * @param parms   show currency amount level.
     * @param quiet   true if want output suppressed.
     * @param verbose @return expanded macro HTML
     */
    public String expandMacro( String[] parms,
                               final boolean quiet, final boolean verbose )
        {
        if ( !quiet )
            {
            out.print( "$" );
            }
        // all parms are optional sometimes.
        String show = "";
        String currency = "";
        String amount = "";
        if ( parms.length > 0 )
            {
            show = parms[ 0 ];
            if ( !ST.isLegal( show, "$APCcN" ) )
                {
                throw new IllegalArgumentException(
                        "Illegal command code character in CurrCon show parameter: " + show );
                }
            }
        if ( parms.length > 1 )
            {
            currency = parms[ 1 ].toUpperCase();
            }
        if ( parms.length > 2 )
            {
            amount = parms[ 2 ];
            if ( !ST.isLegal( amount, "0123456789.,-" ) )
                {
                throw new IllegalArgumentException(
                        "Illegal character in CurrCon Amount: " + amount );
                }
            }
        if ( show.length() == 0 )
            {
            throw new IllegalArgumentException(
                    "CurrCon missing show parm: " + USAGE );
            }
        if ( show.indexOf( 'A' ) >= 0 || show.indexOf( 'P' ) >= 0 )
            {
            // amount and currency mandatory
            if ( amount.length() == 0 )
                {
                throw new IllegalArgumentException(
                        "CurrCon missing amount: " + USAGE );
                }
            if ( currency.length() != 3 )
                {
                if ( currency.equals( "US" ) )
                    {
                    throw new IllegalArgumentException(
                            "CurrCon currency should be USD not US: " + USAGE );
                    }
                if ( currency.equals( "CN" ) )
                    {
                    throw new IllegalArgumentException(
                            "CurrCon currency should be CAD not CN: " + USAGE );
                    }
                throw new IllegalArgumentException(
                        "CurrCon missing USD CAD etc. currency: " + USAGE );
                }
            else
                {
                if ( currency.equals( "CDN" ) )
                    {
                    throw new IllegalArgumentException(
                            "CurrCon currency should be CAD not CDN: " + USAGE );
                    }
                if ( currency.equals( "USA" ) )
                    {
                    throw new IllegalArgumentException(
                            "CurrCon currency should be USD not USA: " + USAGE );
                    }
                // currency length is 3.  We don't knew until later if we will have an exchange rate for that currency.
                }
            }
        else
            {
            // amount and currency not needed
            // If provided, just ignore.
            }
        return expand( show, currency, amount );
        }
    }