/*
 * [SkuStore.java]
 *
 * Summary: Probe sku numbers of non-Amazon estores. Not to probe stock, but to find numbers.
 *
 * Copyright: (c) 2016-2017 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:
 *  1.0 2016-01-25 initial version
 */
package com.mindprod.stores;

import com.mindprod.fastcat.FastCat;
import com.mindprod.http.Get;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.concurrent.TimeUnit;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import static java.lang.System.*;

/**
 * Probe sku numbers of non-Amazon estores. Not to probe stock, but to find numbers.
 * <p/>
 * Cloned from EStore
 *
 * @author Roedy Green, Canadian Mind Products
 * @version 1.0 2016-01-25 initial version
 * @see ProbeForSkus
 * @since 2016-01-25
 */
public enum SkuStore
    {
        BESTBUYCA( "www.bestbuy.ca", "sku=([A-Z0-9]{8})\"", "Sorry, we couldn’t find any results" )
                    {
                    public String buildQueryLink( final String description )
                        {
                        return buildBestBuyCaQueryLink( description );
                        }
                    },
        BESTBUY( "www.bestbuy.com", "skuId=([A-Z0-9]{7,10})\"", "<h1>Oops!</h1><p class=\"no-results-message\">We couldn't find anything matching your search" )
                    {
                    public String buildQueryLink( final String description )
                        {
                        return buildBestBuyComQueryLink( description );
                        }
                    },
        CANADACOMPUTERS( "www.canadacomputers.com", "Item Code: </strong>([A-Z0-9]{6,6})&nbsp;", "We have found 0 active items that match" )
                    {
                    public String buildQueryLink( final String description )
                        {
                        return buildCanadaComputersQueryLink( description );
                        }
                    },
        NCIXCA( "www.ncix.com", "additem=([A-Z0-9]{4,12})&", "No Search Results Found" )
                    {
                    public String buildQueryLink( final String description )
                        {
                        return buildNCIXQueryLink( description );
                        }
                    },
        NCIXUS( "www.ncixus.com", "sku=([A-Z0-9]{4,9})&", "No Search Results Found" )
                    {
                    public String buildQueryLink( final String description )
                        {
                        return buildNCIXQueryLink( description );
                        }
                    },
        NEWEGGCA( "www.newegg.ca", "<li><b>Item #: </b>([A-Z0-9\\- ]{14,18})", "  We have found 0 items that match \"" )
                    {
                    public String buildQueryLink( final String neweggca )
                        {
                        return buildNeweggQueryLink( neweggca );
                        }
                    },
        NEWEGG( "www.newegg.com", "<li><b>Item #: </b>([A-Z0-9\\- ]{14,18})", "we have found 0 active items that match \"" )
                    {
                    public String buildQueryLink( final String description )
                        {
                        return buildNeweggQueryLink( description );
                        }
                    },
        TIGERCA( "www.tigerdirect.ca", "EdpNo=([A-Z0-9]{5,13})&", ">0 Results found for &quot;|returned no results" )
                    {
                    public String buildQueryLink( final String description )
                        {
                        return buildTigerQueryLink( description );
                        }
                    },
        TIGER( "www.tigerdirect.com", "EdpNo=([A-Z0-9]{5,13})&", ">0 Results found for &quot;|returned no results" )
                    {
                    public String buildQueryLink( final String description )
                        {
                        return buildTigerQueryLink( description );
                        }
                    };

    /**
     * how long to wait for site to connect in millis.  Same for all bookstores.  Interprobe time is configurable though.
     */
    private static final int CONNECT_TIMEOUT = ( int ) TimeUnit.SECONDS.toMillis( 45 );

    /**
     * how long to wait for site to respond in millis while reading.  Same for all bookstores.
     */
    private static final int READ_TIMEOUT = ( int ) TimeUnit.SECONDS.toMillis( 30 );

    /**
     * domain to go to with http://
     */
    private final String website;

    /**
     * Regex pattern to find the SKU
     */
    private final Pattern skuFindingPattern;

    /**
     * Regex pattern indicating search failure
     */
    private final Pattern failPattern;

    /**
     * constructor
     *
     * @param website           URL of website we link to
     * @param skuFindingPattern Regex to find the sku
     * @param pattern           that indicates search failed.
     */
    SkuStore( final String website, final String skuFindingPattern, final String failPattern )
        {
        this.website = website;
        this.skuFindingPattern = Pattern.compile( skuFindingPattern );
        this.failPattern = Pattern.compile( failPattern );
        }

    /**
     * link to BestBuy.ca query
     *
     * @param description, description of the product
     *
     * @return URLString to link to that product
     */
    String buildBestBuyCaQueryLink( final String description )
        {
        final FastCat sb = new FastCat( 4 );
        sb.append( "http://", getHost() );
        sb.append( "/Search/SearchResults.aspx?query=" );
        try
            {
            sb.append( URLEncoder.encode( description, "UTF-8" ) );
            }
        catch ( UnsupportedEncodingException e )
            {
            err.println( "UTF-8 not supported" );
            System.exit( 2 );
            }
        return sb.toString();
        }// /method

    /**
     * link to BestBuy.com query
     *
     * @param description, description of the product
     *
     * @return URLString to link to that product
     */
    String buildBestBuyComQueryLink( final String description )
        {
        final FastCat sb = new FastCat( 20 );
        sb.append( "http://", getHost() );
        sb.append( "/site/searchpage.jsp" );
        sb.append( "?_dyncharset=UTF-8" );
        sb.append( "&amp;_dynSessConf=" );
        sb.append( "&amp;id=pcat17071" );
        sb.append( "&amp;type=page" );
        sb.append( "&amp;sc=Global" );
        sb.append( "&amp;cp=1" );
        sb.append( "&amp;nrp=15" );
        sb.append( "&amp;sp=" );
        sb.append( "&amp;qp=" );
        sb.append( "&amp;list=n" );
        sb.append( "&amp;iht=y" );
        sb.append( "&amp;usc=All+Categories" );
        sb.append( "&amp;ks=960" );
        sb.append( "&amp;fs=saas" );
        sb.append( "&amp;keys=keys" );
        sb.append( "&amp;st=" );
        try
            {
            sb.append( URLEncoder.encode( description, "UTF-8" ) );
            }
        catch ( UnsupportedEncodingException e )
            {
            err.println( "UTF-8 not supported" );
            System.exit( 2 );
            }
        return sb.toString();
        }// /method

    /**
     * build an general product areas link to CanadaComputers product
     *
     * @param description description of product area
     *
     * @return link starting with http:
     */
    String buildCanadaComputersQueryLink( final String description )
        {
        // take user to page  http://www.canadacomputers.com/advanced_search_result.php?keywords=ssd
        final FastCat sb = new FastCat( 4 );
        sb.append( "http://", getHost() );
        sb.append( "/advanced_search_result.php?keywords=" );
        try
            {
            sb.append( URLEncoder.encode( description, "UTF-8" ) );
            }
        catch ( UnsupportedEncodingException e )
            {
            err.println( "UTF-8 not supported" );
            System.exit( 2 );
            }
        return sb.toString();
        }// /method

    /**
     * build a general query for NCIX
     *
     * @param description description of product
     *
     * @return http:// search query link
     */
    String buildNCIXQueryLink( final String description )
        {
        // http://search.ncix.com/search/q=xxx&qcatid=0
        final FastCat sb = new FastCat( 5 );
        sb.append( "http://", this.getHost() );
        sb.append( "/search/?q=" );
        try
            {
            sb.append( URLEncoder.encode( description, "UTF-8" ) );
            }
        catch ( UnsupportedEncodingException e )
            {
            err.println( "UTF-8 not supported" );
            System.exit( 2 );
            }
        sb.append( "&amp;qcatid=0" );
        return sb.toString();
        }// /method

    /**
     * build an general product areas link to newegg product
     *
     * @param description description of product area
     *
     * @return link starting with http:
     */
    String buildNeweggQueryLink( final String description )
        {
        // http://www.newegg.ca/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=Intel+320+Series+80+GB+SATA-2+3+Gb%2Fs
        final FastCat sb = new FastCat( 4 );
        sb.append( "http://", getHost() );
        sb.append( "/Product/ProductList.aspx?Submit=ENE&amp;DEPA=0&amp;Order=BESTMATCH&amp;Description=" );
        try
            {
            sb.append( URLEncoder.encode( description, "UTF-8" ) );
            }
        catch ( UnsupportedEncodingException e )
            {
            err.println( "UTF-8 not supported" );
            System.exit( 2 );
            }
        return sb.toString();
        }// /method

    /**
     * build URL to probe for this product by description in this eestore
     *
     * @param description English description of product
     *
     * @return URL string to probe this product
     */
    abstract String buildQueryLink( final String description );

    /**
     * build an general link to tiger/tigerca product area
     *
     * @param description description of product area.
     *
     * @return link starting with http:
     */
    String buildTigerQueryLink( final String description )
        {
        // http://www.tigerdirect.com/applications/SearchTools/search.asp?
        // keywords=xxx
        final FastCat sb = new FastCat( 4 );
        sb.append( "http://", getHost() );
        sb.append( "/applications/SearchTools/search.asp?keywords=" );
        try
            {
            sb.append( URLEncoder.encode( description, "UTF-8" ) );
            }
        catch ( UnsupportedEncodingException e )
            {
            err.println( "UTF-8 not supported" );
            System.exit( 2 );
            }
        return sb.toString();
        }// /method

    private String getHost()
        {
        return website;
        }// /method

    /**
     * probe this estore and get the value of the sku for this product
     *
     * @param description English description of product
     *
     * @return value of the ske for this product, this store. Null if none.
     */
    String probeForSku( final String description )
        {
        try
            {
            final String probeUrl = buildQueryLink( description );
            final Get get = new Get();
            get.setConnectTimeout( CONNECT_TIMEOUT );
            get.setReadTimeout( READ_TIMEOUT );
            get.setInstanceFollowRedirects( true );
            final String big = get.send( new URL( probeUrl ), Get.UTF8 );
            final int responseCode = get.getResponseCode();
            if ( responseCode != 200 )
                {
                return null;
                }
            final Matcher m = skuFindingPattern.matcher( big );
            final Matcher mfail = failPattern.matcher( big );
            if ( m.find() & m.groupCount() >= 1 && !mfail.find() )
                {
                return m.group( 1 );
                }
            else
                {
                return null;
                }
            }
        catch ( IOException e )
            {
            return null;
            }
        }
    }