#!/usr/bin/env cmperl
#-*-mode:perl-*-
#***************************************************************************
#          (c) Copyright 2003 Reshape Inc., All Rights Reserved.
#                              www.reshape.com
#***************************************************************************
#
#         File : revert_changelist
#       Author : Jeremy Russell
#         Date : February 12, 2003
#
#  Description : Obliterates changes made to a server.  This is not a mere
#                revert of a change list.  This actually obliterates a set
#                of files.
#
#***************************************************************************

use strict;
use Carp;
use P4;
use Getopt::Long;
use Dumpvalue;

my (%opts);
GetOptions( \%opts,
            'revert=i',         # Change number.
            'client=s',         # Client under which to execute.
            'debug=i',          # Spits out debug messages.
            'execute',          # Does the actual obliterate.
            'changelist=i',     # Previously created changelist in which to open the reverts.
            'submit',           # Submit the revert change list as needed.
            'user=s',           # User under which to execute.
            'port=s',           # Port of the Perforce server on which to execute.
          );


sub main
{
    my (%opts) = @_;
    $opts{debug} = 0 if not $opts{debug};

    # Create a set up a Perforce client connection.
    my ($p4) = P4->new();
    $p4->SetClient($opts{client}) if $opts{client};
    $p4->SetPort($opts{port}) if $opts{port};
    $p4->SetUser($opts{user}) if $opts{user};
    $p4->ParseForms();
    my ($count) = 1;
    while (($count < 5) && (not ($p4->Init()))){
        $count++;
    }
    my ($change) = $p4->Describe('-s', $opts{revert});
    Dumpvalue->new->dumpValue($change) if $opts{debug} > 4;

    # Iterate through each file and revert it in the specified style.
    if ($opts{execute}) {

        my ($number);
        if ($opts{changelist}) {
            $number = $opts{changelist};
        } else {

            # Create change list.
            my ($form) = $p4->FetchChange();
            delete $form->{Files};
            $form->{Description} = "SW Internal\n\n\tAutomated revert of a bad checkin from change number $opts{revert}.";
            my ($msg) = $p4->SaveChange($form);
            $msg =~ /(\d+)/;
            $number = $1;

        }
        print "Change List Number: $number\n";

        for (my $x = 0; $x < scalar @{$change->{depotFile}}; $x++) {

            # Handle integrates and edits alike.
            if (($change->{action}->[$x] eq 'integrate') || ($change->{action}->[$x] eq 'edit')) {
                my ($backrev) = $change->{rev}->[$x] - 1;
                my ($file) = "$change->{depotFile}->[$x]#$backrev";
                my ($local) = $p4->Fstat($change->{depotFile}->[$x])->{clientFile};


                # Sync to the previous revision and open it for edit into the desired change list.
                $p4->Sync('-f', $file);
                $p4->Edit('-c', $number, $change->{depotFile}->[$x]);

                # Sync and Resolve sequence for text files.  For some reason this method does not work for binaries (.pdf).
                $p4->Sync('-f', $local);
                $p4->Resolve('-ay', $local);

                # Sync and Resolve sequence for binaries.  For some reason this method does not work on text files.
                $p4->Sync('-f', $change->{depotFile}->[$x]);
                $p4->Resolve('-ay', $change->{depotFile}->[$x]);

                # We do not want to revert files that turn out ot be the same as the current revision and three revisions identical.
                $p4->Revert('-a', $local);
                print uc($change->{action}->[$x] ) . " (edit previous version): $file\n" if $opts{debug} > 1;

                # Handle deletes.
            } elsif ($change->{action}->[$x] eq 'delete') {
                my ($backrev) = $change->{rev}->[$x] - 1;
                my ($file) = "$change->{depotFile}->[$x]#$backrev";
                $p4->Sync('-f', $file);
                $p4->Add('-c', $number, $change->{depotFile}->[$x]);
                print uc($change->{action}->[$x] ) . " (adds file): $file\n" if $opts{debug} > 1;

                # Handle branch and add actions alike.
            } elsif (($change->{action}->[$x] eq 'branch') || ($change->{action}->[$x] eq 'add')) {
                my ($file) = "$change->{depotFile}->[$x]#$change->{rev}->[$x]";
                $p4->Delete('-c', $number, $change->{depotFile}->[$x]);
                print uc($change->{action}->[$x] ) . " (deletes file): $file\n" if $opts{debug} > 1;
            }
        }

        if ($opts{submit}) {
            my (@output) = $p4->Submit('-c', $number);
            print join ("\n", @output), "\n";
        }
    } else {

        for (my $x = 0; $x < scalar @{$change->{depotFile}}; $x++) {

            my ($local) = $p4->Fstat($change->{depotFile}->[$x])->{clientFile};

            # Handle integrates and edits alike.
            if (($change->{action}->[$x] eq 'integrate') || ($change->{action}->[$x] eq 'edit')) {
                my ($backrev) = $change->{rev}->[$x] - 1;
                my ($file) = "$change->{depotFile}->[$x]#$backrev";
                print "[Preview] " . uc($change->{action}->[$x] ) . " (edit previous version): $file   $local\n";

                # Handle deletes.
            } elsif ($change->{action}->[$x] eq 'delete') {
                my ($backrev) = $change->{rev}->[$x] - 1;
                my ($file) = "$change->{depotFile}->[$x]#$backrev";
                print "[Preview] " . uc($change->{action}->[$x] ) . " (adds file): $file   $local\n";

                # Handle branch and add actions alike.
            } elsif (($change->{action}->[$x] eq 'branch') || ($change->{action}->[$x] eq 'add')) {
                my ($file) = "$change->{depotFile}->[$x]#$change->{rev}->[$x]";
                print "[Preview] " . uc($change->{action}->[$x] ) . " (deletes file): $file   $local\n";
            }
        }
    }

    $p4->Final();
    return 1;
}

exit not main(%opts);