#!/usr/bin/perl -w
###############################################################################
=pod

=head1 NAME

mig-iconv 

Attempts to invoke B<iconv> on the specified tracked file, placing the
output in [file].iconv

If given no other arguments, the invocation will lool like

=over 5

iconv -f ISO-8859-1 -t UTF-8 -o <file>.utf8 <file>

=back

otherwise, the arguments will be passed through like so

=over 5

iconv [other arguments...] -o <file>.utf8 <file>

=back

You'll need to invoke B<mig-add> prior to using commands like B<mig-iconv>

=head1 SYNOPSIS

B<mig-iconv> <file> [other arguments...]

=cut

###############################################################################

use strict;
use Switch;
use Env qw(
    HOME PGHOST PGPORT PGUSER PGDATABASE MIGSCHEMA
    MIGBASEWORKDIR MIGBASEGITDIR MIGGITDIR MIGWORKDIR
);
use Pod::Usage;
use DBI;
use Cwd 'abs_path';
use FindBin;
my $mig_bin = "$FindBin::Bin/";
use lib "$FindBin::Bin/";
use Mig;

pod2usage(-verbose => 2) if ! $ARGV[0] || $ARGV[0] eq '--help';

Mig::die_if_no_env_migschema();
Mig::die_if_mig_tracking_table_does_not_exist();

my $file = abs_path($ARGV[0]);
if ($file =~ /^$MIGBASEWORKDIR/) {
    call_iconv(@ARGV);
} else {
    print "File falls outside of MIGWORKDIR ($MIGWORKDIR): $file\n";
}

exit 0;

###############################################################################

sub call_iconv {
    my $file = abs_path(shift);
    my @args = @_;

    my $tracked_file_id = Mig::check_for_tracked_file($file);
    if ($tracked_file_id) {
        my $data = Mig::status_this_file($file);
        print "iconv'ing tracked file: $file\n";

        if (scalar(@args) == 0) {
            @args = (
                 '-f'
                ,'ISO-8859-1'
                ,'-t'
                ,'UTF-8'
                ,'--verbose'
            );
        }

        system('iconv', @args, '-o', $file . '.utf8', $file);
        system('touch', $file . '.utf8'); # handle 0-byte files

        my $dbh = Mig::db_connect();
        my $utf8_file = $dbh->quote($file . '.utf8');
        if (! -e $file . '.utf8') {
            print "utf8 file does not exist: $utf8_file\n";
            $utf8_file = $dbh->quote('');
        }

        my $rv = $dbh->do("
            UPDATE $MIGSCHEMA.tracked_file
            SET utf8_filename = $utf8_file
            WHERE base_filename = " . $dbh->quote($file) . "
            ;
        ") || die "Error inserting into table $MIGSCHEMA.tracked_file: $!\n";
        Mig::db_disconnect($dbh);
    } else {
        print "File not currently tracked: $file\n";
    }
}