use strict;
use warnings;

use PostgresNode;
use TestLib;
use Test::More;
use IPC::Run qw(pump finish timer);
use Data::Dumper;

# Do nothing unless Makefile has told us that the build is --with-readline.
if (!defined($ENV{with_readline}) || $ENV{with_readline} ne 'yes')
{
	plan skip_all => 'readline is not supported by this build';
}

# Also, skip if user has set environment variable to command that.
# This is mainly intended to allow working around some of the more broken
# versions of libedit --- some users might find them acceptable even if
# they won't pass these tests.
if (defined($ENV{SKIP_READLINE_TESTS}))
{
	plan skip_all => 'SKIP_READLINE_TESTS is set';
}

# If we don't have IO::Pty, forget it, because IPC::Run depends on that
# to support pty connections
eval { require IO::Pty; };
if ($@)
{
	plan skip_all => 'IO::Pty is needed to run this test';
}

# start a new server
my $node = get_new_node('main');
$node->init;
$node->start;

# set up a few database objects
$node->safe_psql('postgres',
	    "CREATE TABLE tab1 (f1 int, f2 text);\n"
	  . "CREATE TABLE mytab123 (f1 int, f2 text);\n"
	  . "CREATE TABLE mytab246 (f1 int, f2 text);\n");

# Developers would not appreciate this test adding a bunch of junk to
# their ~/.psql_history, so be sure to redirect history into a temp file.
# We might as well put it in the test log directory, so that buildfarm runs
# capture the result for possible debugging purposes.
my $historyfile = "${TestLib::log_path}/010_psql_history.txt";
$ENV{PSQL_HISTORY} = $historyfile;

# Another pitfall for developers is that they might have a ~/.inputrc
# file that changes readline's behavior enough to affect this test.
# So ignore any such file.
$ENV{INPUTRC} = '/dev/null';

# Unset $TERM so that readline/libedit won't use any terminal-dependent
# escape sequences; that leads to way too many cross-version variations
# in the output.
delete $ENV{TERM};
# Some versions of readline inspect LS_COLORS, so for luck unset that too.
delete $ENV{LS_COLORS};

# In a VPATH build, we'll be started in the source directory, but we want
# to run in the build directory so that we can use relative paths to
# access the tmp_check subdirectory; otherwise the output from filename
# completion tests is too variable.
if ($ENV{TESTDIR})
{
	chdir $ENV{TESTDIR} or die "could not chdir to \"$ENV{TESTDIR}\": $!";
}

# Create some junk files for filename completion testing.
my $FH;
open $FH, ">", "tmp_check/somefile"
  or die("could not create file \"tmp_check/somefile\": $!");
print $FH "some stuff\n";
close $FH;
open $FH, ">", "tmp_check/afile123"
  or die("could not create file \"tmp_check/afile123\": $!");
print $FH "more stuff\n";
close $FH;
open $FH, ">", "tmp_check/afile456"
  or die("could not create file \"tmp_check/afile456\": $!");
print $FH "other stuff\n";
close $FH;

# fire up an interactive psql session
my $in  = '';
my $out = '';

my $timer = timer(5);

my $h = $node->interactive_psql('postgres', \$in, \$out, $timer);

like($out, qr/psql/, "print startup banner");

# Simple test case: type something and see if psql responds as expected
sub check_completion
{
	my ($send, $pattern, $annotation) = @_;

	# report test failures from caller location
	local $Test::Builder::Level = $Test::Builder::Level + 1;

	# reset output collector
	$out = "";
	# restart per-command timer
	$timer->start(5);
	# send the data to be sent
	$in .= $send;
	# wait ...
	pump $h until ($out =~ $pattern || $timer->is_expired);
	my $okay = ($out =~ $pattern && !$timer->is_expired);
	ok($okay, $annotation);
	# for debugging, log actual output if it didn't match
	local $Data::Dumper::Terse = 1;
	local $Data::Dumper::Useqq = 1;
	diag 'Actual output was ' . Dumper($out) . "Did not match \"$pattern\"\n"
	  if !$okay;
	return;
}

# Clear query buffer to start over
# (won't work if we are inside a string literal!)
sub clear_query
{
	check_completion("\\r\n", qr/postgres=# /, "\\r works");
	return;
}

# Clear current line to start over
# (this will work in an incomplete string literal, but it's less desirable
# than clear_query because we lose evidence in the history file)
sub clear_line
{
	check_completion("\025\n", qr/postgres=# /, "control-U works");
	return;
}

# check basic command completion: SEL<tab> produces SELECT<space>
check_completion("SEL\t", qr/SELECT /, "complete SEL<tab> to SELECT");

clear_query();

# check case variation is honored
check_completion("sel\t", qr/select /, "complete sel<tab> to select");

# check basic table name completion
check_completion("* from t\t", qr/\* from tab1 /, "complete t<tab> to tab1");

clear_query();

# check table name completion with multiple alternatives
# note: readline might print a bell before the completion
check_completion(
	"select * from my\t",
	qr/select \* from my\a?tab/,
	"complete my<tab> to mytab when there are multiple choices");

# some versions of readline/libedit require two tabs here, some only need one
check_completion(
	"\t\t",
	qr/mytab123 +mytab246/,
	"offer multiple table choices");

check_completion("2\t", qr/246 /,
	"finish completion of one of multiple table choices");

clear_query();

# check case-sensitive keyword replacement
# note: various versions of readline/libedit handle backspacing
# differently, so just check that the replacement comes out correctly
check_completion("\\DRD\t", qr/drds /, "complete \\DRD<tab> to \\drds");

clear_query();

# check filename completion
check_completion(
	"\\lo_import tmp_check/some\t",
	qr|tmp_check/somefile |,
	"filename completion with one possibility");

clear_query();

# note: readline might print a bell before the completion
check_completion(
	"\\lo_import tmp_check/af\t",
	qr|tmp_check/af\a?ile|,
	"filename completion with multiple possibilities");

clear_query();

# COPY requires quoting
# note: broken versions of libedit want to backslash the closing quote;
# not much we can do about that
check_completion(
	"COPY foo FROM tmp_check/some\t",
	qr|'tmp_check/somefile\\?' |,
	"quoted filename completion with one possibility");

clear_line();

check_completion(
	"COPY foo FROM tmp_check/af\t",
	qr|'tmp_check/afile|,
	"quoted filename completion with multiple possibilities");

# some versions of readline/libedit require two tabs here, some only need one
# also, some will offer the whole path name and some just the file name
# the quotes might appear, too
check_completion(
	"\t\t",
	qr|afile123'? +'?(tmp_check/)?afile456|,
	"offer multiple file choices");

clear_line();

# send psql an explicit \q to shut it down, else pty won't close properly
$timer->start(5);
$in .= "\\q\n";
finish $h or die "psql returned $?";
$timer->reset;

# done
$node->stop;
done_testing();