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#  Copyright 2009 - present MongoDB, Inc.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#  http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

use strict;
use warnings;
use Test::More;
use Test::Fatal;
use Tie::IxHash;
use Time::HiRes qw/time/;
use version;

use MongoDB;

use lib "t/lib";
use MongoDBTest qw/skip_unless_mongod build_client get_test_db server_version server_type/;

skip_unless_mongod();

my $conn = build_client();
my $testdb = get_test_db($conn);
my $server_version = server_version($conn);
my $server_type = server_type($conn);

my $coll = $testdb->get_collection('test_collection');
my $coll2 = $testdb->get_collection("cap_collection");

# after dropping coll2, must run command below to make it capped
my $create_capped_cmd = [ create => "cap_collection", capped => 1, size => 10000 ];

my $cursor;
my @values;

# test setup
{
    $coll->drop;

    $coll->insert_one({ foo => 9,  bar => 3, shazbot => 1 });
    $coll->insert_one({ foo => 2,  bar => 5 });
    $coll->insert_one({ foo => -3, bar => 4 });
    $coll->insert_one({ foo => 4,  bar => 9, shazbot => 1 });
}

# $coll->query
{
    @values = $coll->query({}, { sort_by => { foo => 1 } })->all;

    is(scalar @values, 4);
    is ($values[0]->{foo}, -3);
    is ($values[1]->{foo}, 2);
    is ($values[2]->{foo}, 4);
    is ($values[3]->{foo}, 9);

    @values = $coll->query({}, { sort_by => { bar => -1 } })->all;

    is(scalar @values, 4);
    is($values[0]->{bar}, 9);
    is($values[1]->{bar}, 5);
    is($values[2]->{bar}, 4);
    is($values[3]->{bar}, 3);
}

# criteria
{
    @values = $coll->query({ shazbot => 1 }, { sort_by => { foo => -1 } })->all;
    is(scalar @values, 2);
    is($values[0]->{foo}, 9);
    is($values[1]->{foo}, 4);
}

# limit
{
    @values = $coll->query({}, { limit => 3, sort_by => { foo => 1 } })->all;
    is(scalar @values, 3) or diag explain \@values;
    is ($values[0]->{foo}, -3);
    is ($values[1]->{foo}, 2);
    is ($values[2]->{foo}, 4);
}

# limit propagation to result
{
    my $c = $coll->query({}, { limit => 3, sort_by => { foo => 1 } });
    is($c->result->_limit, 3, 'query limit was propagated');
}

# skip
{
    @values = $coll->query({}, { limit => 3, skip => 1, sort_by => { foo => 1 } })->all;
    is(scalar @values, 3);
    is ($values[0]->{foo}, 2);
    is ($values[1]->{foo}, 4);
    is ($values[2]->{foo}, 9);
}

$coll->drop;

# next and all
{
    is($coll->query->next, undef, 'test undef');
    is_deeply([$coll->query->all], []);

    my $id1 = $coll->insert_one({x => 1})->inserted_id;
    my $id2 = $coll->insert_one({x => 5})->inserted_id;

    is($coll->count_documents({}), 2);
    $cursor = $coll->query;
    is($cursor->next->{'x'}, 1);
    is($cursor->next->{'x'}, 5);
    is($cursor->next, undef);

    my $cursor2 = $coll->query({x => 5});
    is_deeply([$cursor2->all], [{_id => $id2, x => 5}]);

    is_deeply([$coll->query->all], [{_id => $id1, x => 1}, {_id => $id2, x => 5}]);
}

# sort, and sort by tie::ixhash
{
    my $cursor_sort = $coll->query->sort({'x' => -1});
    is($cursor_sort->has_next, 1);
    is($cursor_sort->next->{'x'}, 5, 'Cursor->sort');
    is($cursor_sort->next->{'x'}, 1);

    $cursor_sort = $coll->query->sort({'x' => 1});
    is($cursor_sort->next->{'x'}, 1);
    is($cursor_sort->next->{'x'}, 5);

    my $hash = Tie::IxHash->new("x" => -1);
    $cursor_sort = $coll->query->sort($hash);
    is($cursor_sort->has_next, 1);
    is($cursor_sort->next->{'x'}, 5, 'Tie::IxHash cursor->sort');
    is($cursor_sort->next->{'x'}, 1);
}

# paging
{
    $coll->insert_one({x => 2});
    $coll->insert_one({x => 3});
    $coll->insert_one({x => 4});
    my $paging = $coll->query->skip(1)->limit(2);
    is($paging->has_next, 1, 'check skip/limit');
    $paging->next;
    is($paging->has_next, 1);
    $paging->next;
    is(int $paging->has_next, 0);
}

# bigger test, with index
{
    $coll = $testdb->get_collection('test');
    $coll->drop;
    $coll->indexes->create_one({'sn'=>1});

    my $bulk = $coll->unordered_bulk;
    $bulk->insert_one({sn => $_}) for 0 .. 5000;
    $bulk->execute;

    $cursor = $coll->query;
    my $count = 0;
    while (my $doc = $cursor->next()) {
        $count++;
    }
    is(5001, $count);

    my @all = $coll->find->limit(3999)->all;
    is( 0+@all, 3999, "got limited documents" );
}

# reset
{
    my ( $r1, $r2 );
    ok( $cursor->reset, "first reset" );
    ok( ( $r1 = $cursor->next ), "first doc after first reset" );
    ok( $cursor->reset, "second reset" );
    ok( ( $r2 = $cursor->next ), "first doc after second reset" );

    is($r1->{'sn'}, $r2->{'sn'}, 'reset');
}

# explain
{
    my $exp = $cursor->explain;

    if ( $server_version >= v2.7.3 ) {
        is ($exp->{executionStats}{nReturned}, 5001, "count of items" );
        $cursor->reset;
        $exp = $cursor->limit(20)->explain;
        is ($exp->{executionStats}{nReturned}, 20, "explain with limit" );
        $cursor->reset;
        $exp = $cursor->limit(-20)->explain;
        is ($exp->{executionStats}{nReturned}, 20, "explain with negative limit" );
    }
    else {
        is($exp->{'n'}, 5001, 'explain');
        is($exp->{'cursor'}, 'BasicCursor');

        $cursor->reset;
        $exp = $cursor->limit(20)->explain;
        is(20, $exp->{'n'}, 'explain limit');
        $cursor->reset;
        $exp = $cursor->limit(-20)->explain;
        is(20, $exp->{'n'});
    }
}

# hint
{
    $cursor->reset;
    my $hinted = $cursor->hint({'x' => 1});
    is($hinted, $cursor, "hint returns self");

    $coll->drop;

    $coll->insert_one({'num' => 1, 'foo' => 1});

    # "Command Op::_Explain will throw a MongoDB::Error, while the legacy
    # code will throw a MongoDB::DatabaseError, so test must check both.
    like( exception { $coll->query->hint( { 'num' => 1 } )->explain },
        qr/MongoDB::(Database)?Error/, "check error on hint with explain" );
}

# cursor opts
# not a functional test, just make sure they don't blow up
{
    $cursor = $coll->find();

    $cursor = $cursor->tailable(1);
    is($cursor->_query->options->{cursorType}, 'tailable', "set tailable");
    $cursor = $cursor->tailable(0);
    is($cursor->_query->options->{cursorType}, 'non_tailable', "clear tailable");

    $cursor = $cursor->tailable_await(1);
    is($cursor->_query->options->{cursorType}, 'tailable_await', "set tailable_await");
    $cursor = $cursor->tailable_await(0);
    is($cursor->_query->options->{cursorType}, 'non_tailable', "clear tailable_await");

    $cursor = $cursor->tailable(1);
    is($cursor->_query->options->{cursorType}, 'tailable', "set tailable");
    $cursor = $cursor->tailable_await(0);
    is($cursor->_query->options->{cursorType}, 'non_tailable', "clear tailable_await");

    $cursor = $cursor->tailable_await(1);
    is($cursor->_query->options->{cursorType}, 'tailable_await', "set tailable_await");
    $cursor = $cursor->tailable(0);
    is($cursor->_query->options->{cursorType}, 'non_tailable', "clear tailable");

    #test is actual cursor
    $coll->drop;
    $coll->insert_one({"x" => 1});
    $cursor = $coll->find()->tailable(0);
    my $doc = $cursor->next;
    is($doc->{'x'}, 1);

    $cursor = $coll->find();

    $cursor->immortal(1);
    ok($cursor->_query->options->{noCursorTimeout}, "set immortal");
    $cursor->immortal(0);
    ok(! $cursor->_query->options->{noCursorTimeout}, "clear immortal");
}

# explain
{
    $coll->drop;

    $coll->insert_one({"x" => 1});

    $cursor = $coll->find;
    my $doc = $cursor->next;
    is($doc->{'x'}, 1);

    my $exp = $cursor->explain;

    # cursor should not be reset
    $doc = $cursor->next;
    is($doc, undef) or diag explain $doc;
}

# info
{
    $coll->drop;
    $coll->insert_one( { x => $_ } ) for 1 .. 1000;
    $cursor = $coll->find;

    my $info = $cursor->info;
    is_deeply( $info, {num => 0}, "before execution, info only has num field");

    ok( $cursor->has_next, "cursor executed and has results" );
    $info = $cursor->info;
    ok($info->{'num'} > 0, "cursor reports more than zero results");
    is($info->{'at'}, 0, "cursor still not iterated");
    is($info->{'start'}, 0);
    ok($info->{'cursor_id'}, "cursor_id non-zero");

    $cursor->next;
    $info = $cursor->info;
    is($info->{'at'}, 1);

    $cursor->all;
    $info = $cursor->info;
    is($info->{at}, 1000);
    is($info->{num}, 1000, 'cursor_num after ->all');
}

# sort_by
{
    $coll->drop;

    for (my $i=0; $i < 5; $i++) {
        $coll->insert_one({x => $i});
    }

    # XXX this test makes no sense; remove? fix? -- xdg, 2016-08-10
    $cursor = $coll->query({}, { limit => 10, skip => 0, sort_by => {created => 1 }});
    is($coll->count_documents({}), 5);
}

# delayed tailable cursor
subtest "delayed tailable cursor" => sub {
    $coll2->drop;
    $testdb->run_command($create_capped_cmd);

    $coll2->insert_one( { x => $_ } ) for 0 .. 9;

    # Get last doc
    my $cursor = $coll2->find()->sort({x => -1})->limit(1);
    my $last_doc = $cursor->next();

    $cursor = $coll2->find({_id => {'$gt' => $last_doc->{_id}}})->tailable(1);

    # We won't get anything yet
    $cursor->next();

    for (my $i=10; $i < 20; $i++) {
        $coll2->insert_one({x => $i});
    }

    # We should retrieve documents here since we are tailable.
    my $count =()= $cursor->all;

    is($count, 10);
};

# tailable_await
subtest "await data" => sub {
    $coll2->drop;
    $testdb->run_command($create_capped_cmd);

    $coll2->insert_one( { x => $_ } ) for 0 .. 9;

    # Get last doc
    my $cursor = $coll2->find()->sort( { x => -1 } )->limit(1);
    my $last_doc = $cursor->next();

    my $start = time;
    $cursor = $coll2->find( { _id => { '$gt' => $last_doc->{_id} } } )->tailable_await(1)
      ->max_await_time_ms(2000);

    # We won't get anything yet
    $cursor->next();
    my $end = time;

    # did it actually block for a bit?
    ok( $end >= $start + 1, "cursor blocked to await data" )
      or diag "START: $start; END: $end";
};

done_testing;

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