#!/usr/bin/perl -w
use Getopt::Long;
use Text::CSV::Auto;
use Data::Dumper;
use DBI;
use File::Basename;
use Env qw(
    HOME PGHOST PGPORT PGUSER PGDATABASE MIGSCHEMA
    MIGBASEWORKDIR MIGBASEGITDIR MIGGITDIR MIGWORKDIR
);

my $dbh;
my $cfg;
my $csv_config;

sub init {
    if ($PGHOST and $PGPORT and $PGUSER and $PGDATABASE) 
    {
        $dbh = connect_db($PGDATABASE,$PGUSER,undef,$PGHOST) or die $DBI::errstr;
    } else {
        our %config;
        do '/openils/conf/offline-config.pl';
        $dbh = DBI->connect( $config{dsn}, $config{usr}, $config{pw} ) or die $DBI::errstr;
    }

	$cfg = {
		schema => 'm_foo',
		auto_options => {
		}
	};
	our %CSV_options = (
	    binary => 1,
	    auto_diag => 1,
	    diag_verbose => 1,
	);
	$cfg->{auto_options}->{csv_options} = \%CSV_options;

	GetOptions(
		'config=s' => \$csv_config,
		'no-legacy-prefix' => \($cfg->{no_legacy_prefix}),
		'use-no-headers-file' => \($cfg->{use_no_headers_file}),
		'add-x-migrate' => \($cfg->{add_x_migrate}),
        'outfile=s' => \($cfg->{outfile}),
		'schema=s' => \($cfg->{schema}),
		'parent=s' => \($cfg->{parent}),
		'help|?' => \$help
	);
	if ($help || ((@ARGV == 0) && (-t STDIN))) {
		die qq^\n\t$0 [--config <CONFIG>] [--add-x-migrate] [--no-legacy-prefix] [--schema <schema>] [--parent <base table>] [--outfile <file to create>] <"clean" file from clean_csv script>\n\n^;
	}
	if ($csv_config && ! -e $csv_config) {
		die "$csv_config does not exist\n";
	}
	if ($csv_config && -e $csv_config) {
		do $csv_config;
	}
	if (! -e $ARGV[0]) {
		die "$ARGV[0] does not exist\n";
	}
}

sub connect_db {
    my ($db, $dbuser, $dbpw, $dbhost) = @_;

    my $dsn = "dbi:Pg:host=$dbhost;dbname=$db;port=5432";

    my $attrs = {
        ShowErrorStatement => 1,
        RaiseError => 1,
        PrintError => 1,
        pg_enable_utf8 => 1,
    };
    my $dbh = DBI->connect($dsn, $dbuser, $dbpw, $attrs);

    return $dbh;
}


sub write_sql_sample {
	my $cfg = shift;
	my $info = shift;
	my $fn = $cfg->{outfile} || $cfg->{auto_options}->{file} . '.sql';

	print "\twriting $fn\n";
	local *SQL;
	open SQL, ">$fn";
	print SQL "-- $cfg->{auto_options}->{file}\n/*\n";
	open IN, $cfg->{auto_options}->{file};
	foreach (1..5) {
		my $line = <IN>;
		print SQL $line;
	}
	close IN;
	print SQL "*/\n";
	return *SQL;
}

sub write_sql_table {
	my $sql = shift;
	my $cfg = shift;
	my $info = shift;
	my $fn = $cfg->{auto_options}->{file};
	my @indices = ();

	print "\twriting table definition\n";
    if ($cfg->{parent}) {
        $cfg->{table_name} = $cfg->{parent} . '_legacy';
    } else {
	    $cfg->{table_name} = lc(basename($fn)); $cfg->{table_name} =~ s/[\-\. ]/_/g;
    }
	print $sql "DROP TABLE IF EXISTS $cfg->{schema}.$cfg->{table_name};\n";
	print $sql "CREATE UNLOGGED TABLE $cfg->{schema}.$cfg->{table_name} (\n";
	my $idx = 0;
	if ($cfg->{add_x_migrate}) {
		print $sql "    x_migrate BOOLEAN\n";
		$idx++;
		push @indices, 'x_migrate';
	}
	foreach my $column (@{ $info }) {
		my $cn = $column->{'header'};
		if ($cn =~ /^x_/) {
			push @indices, $cn;
		}
		my $col_info = Dumper($column);
		$col_info =~ s/^\$VAR1 = //;
		print $sql "   " . ($idx++ ? ',' : ' ');
		print $sql "l_" unless $cfg->{no_legacy_prefix} or $column->{'header'} =~ /^x_/ or $column->{'header'} =~ /^l_/;
        print $sql "$cn " . ($cn eq 'x_eg_bib_id' ? 'BIGINT' : 'TEXT');
        print $sql " /*\n         $col_info   */\n";
	}
    if ($cfg->{parent}) {
	    print $sql ') INHERITS (' . $cfg->{schema} . '.' . $cfg->{parent} . ");\n";
    } else {
	    print $sql ");\n";
    }
	foreach my $cn (@indices) {
		print $sql "CREATE INDEX ON $cfg->{schema}.$cfg->{table_name} ($cn);\n";
	}
}

sub write_sql_loader {
	my $sql = shift;
	my $cfg = shift;
	my $auto = shift;
	my $info = shift;
	my $fn = $cfg->{auto_options}->{file} . ($cfg->{use_no_headers_file} ? '.no_headers' : '');

	print "\twriting copy statement\n";
	print $sql "\n\\COPY $cfg->{schema}.$cfg->{table_name} (";
    my $idx = 0;
    foreach my $column (@{ $info }) {
        print $sql ($idx++ ? ',' : '');
        print $sql "l_" unless $cfg->{no_legacy_prefix} or $column->{'header'} =~ /^x_/ or $column->{'header'} =~ /^l_/;
        print $sql $column->{'header'};
    }
    print $sql ") FROM '$fn'";
    if ($auto->csv->sep_char eq chr(9) && ! defined $auto->csv->quote_char && ! defined $auto->csv->escape_char) {
        # true .tsv, don't treat as csv
    } elsif ($auto->csv->sep_char eq chr(9)) {
        # probably good enough .tsv, don't treat as csv
    } else {
        print $sql " WITH csv " . ($cfg->{use_no_headers_file} ? "" : "header");
        print $sql " delimiter " . $dbh->quote( $auto->csv->sep_char ) unless $dbh->quote( $auto->csv->sep_char ) eq 'NULL';
        print $sql " quote " . $dbh->quote( $auto->csv->quote_char ) unless $dbh->quote( $auto->csv->quote_char ) eq 'NULL';
        print $sql " escape " . $dbh->quote( $auto->csv->escape_char ) unless $dbh->quote( $auto->csv->escape_char ) eq 'NULL';
    }
	print $sql "\n";
}

sub main {
	init();
	foreach my $fn (@ARGV) {
		print "processing $fn\n";
		$cfg->{auto_options}->{file} = $fn;
		my $auto = Text::CSV::Auto->new($cfg->{auto_options});

		my $info = $auto->analyze();
		my $sql = write_sql_sample($cfg,$info);
		write_sql_table($sql,$cfg,$info);
		write_sql_loader($sql,$cfg,$auto,$info);
		close $sql;

		print "\tdone.\n";
	}
}

main();