#!/usr/bin/perl
#
# Author    : BigDiver
# Copyright : 2009 all rights reserved.
#
# Please do not remove this copyright notice and credit the original author
#
# import-products is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# import-products is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with import-products.  If not, see <http://www.gnu.org/licenses/>.
#

# Perl Strictness, pretty vars, and version
use strict;
use warnings;
use English qw( -no_match_vars );
use version; my $VERSION = qv('0.01');

# Needed CPAN Modules
use WWW::Salesforce::Simple;
use Getopt::Long;
use Text::CSV_XS;
use Scalar::Util qw( looks_like_number );

# Command Line processing
my %cli_options = command_line();

# Parse CSV product file and setup quantities HASH
# Hash Keys   : Product SKU
# hash Values : Product Quantity
my %quantity_of = get_products_from( $cli_options{csv} );

# Login to Salesforce with user credentials
my $sf = {};
eval {
    $sf = WWW::Salesforce::Simple->new(
        'username' => $cli_options{ user },
        'password' => $cli_options{ pass },
    );
};
die $EVAL_ERROR if ( $EVAL_ERROR );

die "Error: user $cli_options{user} could not login to Salesforce.com"
    if( !$sf );
    
# Check if the user asked to delete all products before importing file
if ( $cli_options{ delete } ) {
    salesforce_delete_products_from( $sf, $cli_options{ opportunity } );
}

# Get the necessary product information from Salesforce.com
# We need the PricebookEntryId, UnitPrice and ProductCode
for my $product_code ( keys %quantity_of ) {
    my $salesforce_product_ref =
        salesforce_get_product_wth_code($sf, $product_code);
   
    # If the product is not Active in Salesforce do not add it
    next if ( !$salesforce_product_ref->{ IsActive } );
    
    if ( !$salesforce_product_ref->{ Pricebook2Id } ) {
        print "Product $product_code not found in Salesforce.com. Skipping \n";
        next;
    }
    
    # Add product to opportunity
    print "Adding - SKU: $salesforce_product_ref->{ProductCode}"
        . ", Quantity: $quantity_of{$product_code}\n";
        
    eval {
        $sf->create(
            type=> "OpportunityLineItem",
            OpportunityId    => $cli_options{ opportunity },
            Quantity         => $quantity_of{ $product_code },
            Description      => $salesforce_product_ref->{ Name },
            UnitPrice        => $salesforce_product_ref->{ UnitPrice },
            PricebookEntryId => $salesforce_product_ref->{ Id }->[0],
        );
    };
    
    die $EVAL_ERROR if( $EVAL_ERROR );
    
}

print "Done\n";
### End Main ###

# Get products from CSV file
# Arguments: $filename - the name of the CSV file
# Returns: Hash with the products
sub get_products_from {
    my ($file_name ) = @_;
    
    my @rows;
    my %products;
    
    my $csv = Text::CSV_XS->new ({ binary => 1 }) or
        die "Cannot use CSV: ".Text::CSV->error_diag ();
    
    open my $fh, "<:encoding(utf8)", $file_name
        or die "$file_name: $!";
    
    while (my $row = $csv->getline ($fh)) {
        
        if ( looks_like_number $row->[1] ) { 
            $products{ $row->[0] } = $row->[1];
        }
        else {
            die "$file_name: Bad quantity $row->[1]\n";
        }
    }
    $csv->eof or $csv->error_diag ();
    close $fh;
    
    return %products;
}

# Get product information from Salesforce.com based on the product code or SKU
# Arguments
#      $sf          - WWW::Salesforce object
#      $product_sku - Product code
# Returns: Hash ref with all the product information. Check SOQL for more info
sub salesforce_get_product_wth_code {
    my ($sforce, $product_sku) = @_;
    
    my $query =
          qq{SELECT Id, Name, Pricebook2Id, Product2Id, UnitPrice, IsActive, }
        . qq{UseStandardPrice, CreatedDate, CreatedById, LastModifiedDate, }
        . qq{LastModifiedById, SystemModstamp, ProductCode, IsDeleted }
        . qq{FROM PricebookEntry WHERE ProductCode = '$product_sku'};
    
    my $query_result_ref;
    eval {
        $query_result_ref = $sforce->do_query($query, 1);
    };
    
    die $EVAL_ERROR if( $EVAL_ERROR );
    
    # If no records were found just return empty hash
    return {} if( !$query_result_ref);
    
    return $query_result_ref->[0];
}

# Delete all products associated with an opportunity
# Arguments
#      $sf             - WWW::Salesforce object
#      $opportunity_id - Salesforce.com opportunity ID
# Returns: nothing
sub salesforce_delete_products_from {
    my ($sforce, $opportunity_id) = @_;
    
    # SOQL Query to get the product list
    my $query =
          qq{SELECT Id FROM OpportunityLineItem }
        . qq{WHERE OpportunityId = '$opportunity_id'};
    
    # Send the query to Salesforce.com
    my $query_result_ref;
    eval {
        $query_result_ref = $sforce->do_query($query, 1);
    };
    die $EVAL_ERROR if( $EVAL_ERROR );
    
    # If no records were found just return
    return if( !$query_result_ref);
    
    # Save the product IDs that we got back
    my @products_to_delete = ();
    for my $result_ref ( @{ $query_result_ref } ) {
        push @products_to_delete, $result_ref->{Id}->[0];
    }
    
    # Now delete all the products from the OpportunityLineItem table
    eval {
        $sforce->delete( @products_to_delete );
    };
    die $EVAL_ERROR if( $EVAL_ERROR );
}

# Simple command line processing
sub command_line {
    my %cli;
    print "\nimport-products $VERSION";
    print "\nAuthor: BigDiver (bigdiver.wordpress.com)\n\n";

    ## process and check cmd line args ##
    GetOptions(\%cli,
           "help",
           "version",
           "quiet",
           "csv=s",
           "opportunity=s",
           "user=s",
           "pass=s",
           "delete",
          );

    if ( $cli{ help } || $cli{ version })  {
        usage();
        exit;
    }
    
    # Check validity of the must have parameters
    if (    !$cli{ csv }
         || !$cli{ opportunity }
         || !$cli{ user }
         || !$cli{ pass } )  {
        
        usage(); exit(0);
    
    }

    return %cli;
}

# Just pring script usage
sub usage {
    print <<"HERE";

Import products from CSV formated file into Salesforce.com Opportunity

    import-products --csv=<product-file.csv> --opportunity=<opportunityID>
                    --user=<user name> --pass=<password>
                    [--delete]

        product-file.csv
            MUST be a Comma Separated file with two columns (SKU, Quantity).
            No header line.
       
        opportunityID
            MUST be an existant Salesforce Opportunity to which you want to add
            the products from the <products-file.csv> to.
          
        user, pass
            Salesforce.com user name and password.
          
        delete
            Delete all of the opportunities products before adding any new ones.
          
HERE
}