////////////////////////////////////////////////////////////////////////////////
/// @brief tests for query language, sort optimisations
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2010-2012 triagens GmbH, Cologne, Germany
///
/// 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.
///
/// Copyright holder is triAGENS GmbH, Cologne, Germany
///
/// @author Jan Steemann
/// @author Copyright 2012, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

var jsunity = require("jsunity");
var internal = require("internal");
var helper = require("org/arangodb/aql-helper");
var getQueryResults = helper.getQueryResults2;
var getQueryExplanation = helper.getQueryExplanation;

////////////////////////////////////////////////////////////////////////////////
/// @brief test suite
////////////////////////////////////////////////////////////////////////////////

function ahuacatlQueryOptimiserSortTestSuite () {
  var collection = null;
  var cn = "UnitTestsAhuacatlOptimiserSort";

  return {

////////////////////////////////////////////////////////////////////////////////
/// @brief set up
////////////////////////////////////////////////////////////////////////////////

    setUp : function () {
      internal.db._drop(cn);
      collection = internal.db._create(cn);

      for (var i = 0; i < 100; ++i) {
        collection.save({ "value" : i, "value2" : i });
      }
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief tear down
////////////////////////////////////////////////////////////////////////////////

    tearDown : function () {
      internal.db._drop(cn);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief check sort optimisation without index
////////////////////////////////////////////////////////////////////////////////

    testNoIndex1 : function () {
      var query = "FOR c IN " + cn + " SORT c.value RETURN c";

      var actual = getQueryResults(query);
      assertEqual(100, actual.length);
      assertEqual(0, actual[0].value);
      assertEqual(1, actual[1].value);
      assertEqual(2, actual[2].value);
      assertEqual(3, actual[3].value);
      assertEqual(50, actual[50].value);
      assertEqual(98, actual[98].value);
      assertEqual(99, actual[99].value);
      
      var explain = getQueryExplanation(query);
      assertEqual("for", explain[0].type);
      assertEqual("sort", explain[1].type); // no optimisation as there's no index
      assertEqual("return", explain[2].type);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief check sort optimisation without index
////////////////////////////////////////////////////////////////////////////////

    testNoIndex2 : function () {
      var query = "FOR c IN " + cn + " SORT c.value DESC RETURN c";

      var actual = getQueryResults(query);
      assertEqual(100, actual.length);
      assertEqual(99, actual[0].value);
      assertEqual(98, actual[1].value);
      assertEqual(97, actual[2].value);
      assertEqual(96, actual[3].value);
      assertEqual(49, actual[50].value);
      assertEqual(1, actual[98].value);
      assertEqual(0, actual[99].value);
      
      var explain = getQueryExplanation(query);
      assertEqual("for", explain[0].type);
      assertEqual("sort", explain[1].type); // no optimisation as there's no index
      assertEqual("return", explain[2].type);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief check sort optimisation with skiplist index
////////////////////////////////////////////////////////////////////////////////

    testSkiplist1 : function () {
      collection.ensureSkiplist("value");

      var query = "FOR c IN " + cn + " SORT c.value RETURN c";

      var actual = getQueryResults(query);
      assertEqual(100, actual.length);
      assertEqual(0, actual[0].value);
      assertEqual(1, actual[1].value);
      assertEqual(2, actual[2].value);
      assertEqual(3, actual[3].value);
      assertEqual(50, actual[50].value);
      assertEqual(98, actual[98].value);
      assertEqual(99, actual[99].value);
      
      var explain = getQueryExplanation(query);
      assertEqual("for", explain[0].type);
      assertEqual("sort", explain[1].type); // no optimisation as there's no filter and thus no index involved
      assertEqual("return", explain[2].type);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief check sort optimisation with skiplist index
////////////////////////////////////////////////////////////////////////////////

    testSkiplist2 : function () {
      collection.ensureSkiplist("value");

      var query = "FOR c IN " + cn + " FILTER c.value >= 15 SORT c.value RETURN c";

      var actual = getQueryResults(query);
      assertEqual(85, actual.length);
      assertEqual(15, actual[0].value);
      assertEqual(16, actual[1].value);
      assertEqual(17, actual[2].value);
      assertEqual(18, actual[3].value);
      assertEqual(98, actual[83].value);
      assertEqual(99, actual[84].value);
      
      var explain = getQueryExplanation(query);
      assertEqual("for", explain[0].type);
      assertEqual("filter", explain[1].type); // sort optimised away
      assertEqual("return", explain[2].type);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief check sort optimisation with skiplist index
////////////////////////////////////////////////////////////////////////////////

    testSkiplist3 : function () {
      collection.ensureSkiplist("value");

      var query = "FOR c IN " + cn + " FILTER c.value >= 15 SORT c.value DESC RETURN c";

      var actual = getQueryResults(query);
      assertEqual(85, actual.length);
      assertEqual(99, actual[0].value);
      assertEqual(98, actual[1].value);
      assertEqual(97, actual[2].value);
      assertEqual(96, actual[3].value);
      assertEqual(16, actual[83].value);
      assertEqual(15, actual[84].value);
      
      var explain = getQueryExplanation(query);
      assertEqual("for", explain[0].type);
      assertEqual("filter", explain[1].type); 
      assertEqual("sort", explain[2].type); // sort still there because sort order is DESC
      assertEqual("return", explain[3].type);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief check multiple sorts
////////////////////////////////////////////////////////////////////////////////

    testMultipleSorts1 : function () {
      collection.ensureSkiplist("value");

      var query = "FOR c IN " + cn + " FILTER c.value >= 0 SORT c.value SORT c.value RETURN c";

      var actual = getQueryResults(query);
      assertEqual(100, actual.length);
      assertEqual(0, actual[0].value);
      assertEqual(1, actual[1].value);
      assertEqual(2, actual[2].value);
      assertEqual(3, actual[3].value);
      assertEqual(50, actual[50].value);
      assertEqual(98, actual[98].value);
      assertEqual(99, actual[99].value);
      
      var explain = getQueryExplanation(query);
      assertEqual("for", explain[0].type);
      assertEqual("filter", explain[1].type); // sort optimised away
      assertEqual("return", explain[2].type);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief check multiple sorts
////////////////////////////////////////////////////////////////////////////////

    testMultipleSorts2 : function () {
      collection.ensureSkiplist("value");

      var query = "FOR c IN " + cn + " FILTER c.value >= 0 SORT c.value SORT c.value DESC RETURN c";

      var actual = getQueryResults(query);
      assertEqual(100, actual.length);
      assertEqual(99, actual[0].value);
      assertEqual(98, actual[1].value);
      assertEqual(97, actual[2].value);
      assertEqual(96, actual[3].value);
      assertEqual(49, actual[50].value);
      assertEqual(1, actual[98].value);
      assertEqual(0, actual[99].value);
      
      var explain = getQueryExplanation(query);
      assertEqual("for", explain[0].type);
      assertEqual("filter", explain[1].type); 
      assertEqual("sort", explain[2].type); // sort still there
      assertEqual("return", explain[3].type);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief check multiple sorts
////////////////////////////////////////////////////////////////////////////////

    testMultipleSorts3 : function () {
      collection.ensureSkiplist("value");

      var query = "FOR c IN " + cn + " FILTER c.value >= 0 SORT c.value DESC SORT c.value RETURN c";

      var actual = getQueryResults(query);
      var explain = getQueryExplanation(query);
      assertEqual(100, actual.length);
      assertEqual(0, actual[0].value);
      assertEqual(1, actual[1].value);
      assertEqual(2, actual[2].value);
      assertEqual(3, actual[3].value);
      assertEqual(50, actual[50].value);
      assertEqual(98, actual[98].value);
      assertEqual(99, actual[99].value);
      
      var explain = getQueryExplanation(query);
      assertEqual("for", explain[0].type);
      assertEqual("filter", explain[1].type); 
      assertEqual("sort", explain[2].type); // sort still there
      assertEqual("sort", explain[3].type); // sort still there
      assertEqual("return", explain[4].type);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief check sort optimisation with skiplist index
////////////////////////////////////////////////////////////////////////////////

    testMultipleFields1 : function () {
      collection.ensureSkiplist("value", "value2");

      var query = "FOR c IN " + cn + " FILTER c.value >= 0 SORT c.value RETURN c";

      var actual = getQueryResults(query);
      assertEqual(100, actual.length);
      assertEqual(0, actual[0].value);
      assertEqual(1, actual[1].value);
      assertEqual(2, actual[2].value);
      assertEqual(3, actual[3].value);
      assertEqual(50, actual[50].value);
      assertEqual(98, actual[98].value);
      assertEqual(99, actual[99].value);
      
      var explain = getQueryExplanation(query);
      assertEqual("for", explain[0].type);
      assertEqual("filter", explain[1].type); 
      assertEqual("sort", explain[2].type); // sort still there
      assertEqual("return", explain[3].type);
      
      query = "FOR c IN " + cn + " FILTER c.value == 0 && c.value2 >= 0 SORT c.value RETURN c";

      actual = getQueryResults(query);
      assertEqual(1, actual.length);
      assertEqual(0, actual[0].value);
      
      explain = getQueryExplanation(query);
      assertEqual("for", explain[0].type);
      assertEqual("filter", explain[1].type); // sort optimised away
      assertEqual("return", explain[2].type);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief check sort optimisation with skiplist index
////////////////////////////////////////////////////////////////////////////////

    testMultipleFields2 : function () {
      collection.ensureSkiplist("value", "value2");

      var query = "FOR c IN " + cn + " FILTER c.value >= 0 SORT c.value, c.value2 RETURN c";

      var actual = getQueryResults(query);
      assertEqual(100, actual.length);
      assertEqual(0, actual[0].value);
      assertEqual(1, actual[1].value);
      assertEqual(2, actual[2].value);
      assertEqual(3, actual[3].value);
      assertEqual(50, actual[50].value);
      assertEqual(98, actual[98].value);
      assertEqual(99, actual[99].value);
      
      var explain = getQueryExplanation(query);
      assertEqual("for", explain[0].type);
      assertEqual("filter", explain[1].type); 
      assertEqual("sort", explain[2].type); // sort still there
      assertEqual("return", explain[3].type);
      
      query = "FOR c IN " + cn + " FILTER c.value == 0 && c.value2 <= 1 SORT c.value, c.value2 RETURN c";

      actual = getQueryResults(query);
      assertEqual(1, actual.length);
      assertEqual(0, actual[0].value);

      explain = getQueryExplanation(query);
      assertEqual("for", explain[0].type);
      assertEqual("filter", explain[1].type); // sort optimised away
      assertEqual("return", explain[2].type);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief check sort optimisation with skiplist index
////////////////////////////////////////////////////////////////////////////////

    testMultipleFields3 : function () {
      collection.ensureSkiplist("value", "value2");

      var query = "FOR c IN " + cn + " FILTER c.value2 >= 0 SORT c.value RETURN c";

      var actual = getQueryResults(query);
      assertEqual(100, actual.length);
      assertEqual(0, actual[0].value);
      assertEqual(1, actual[1].value);
      assertEqual(2, actual[2].value);
      assertEqual(3, actual[3].value);
      assertEqual(50, actual[50].value);
      assertEqual(98, actual[98].value);
      assertEqual(99, actual[99].value);
      
      var explain = getQueryExplanation(query);
      assertEqual("for", explain[0].type);
      assertEqual("filter", explain[1].type); 
      assertEqual("sort", explain[2].type); // cannot use index for sorting
      assertEqual("return", explain[3].type);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief check sort optimisation with skiplist index
////////////////////////////////////////////////////////////////////////////////

    testMultipleFields4 : function () {
      collection.ensureSkiplist("value", "value2");

      var query = "FOR c IN " + cn + " FILTER c.value >= 0 && c.value2 >= 0 SORT c.value RETURN c";

      var actual = getQueryResults(query);
      assertEqual(100, actual.length);
      assertEqual(0, actual[0].value);
      assertEqual(1, actual[1].value);
      assertEqual(2, actual[2].value);
      assertEqual(3, actual[3].value);
      assertEqual(50, actual[50].value);
      assertEqual(98, actual[98].value);
      assertEqual(99, actual[99].value);
      
      var explain = getQueryExplanation(query);
      assertEqual("for", explain[0].type);
      assertEqual("filter", explain[1].type); // cannot use index for sorting
      assertEqual("sort", explain[2].type); // cannot use index for sorting
      assertEqual("return", explain[3].type);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief check sort optimisation with skiplist index
////////////////////////////////////////////////////////////////////////////////

    testMultipleFields5 : function () {
      collection.ensureSkiplist("value2", "value");

      var query = "FOR c IN " + cn + " FILTER c.value >= 0 SORT c.value RETURN c";

      var actual = getQueryResults(query);
      assertEqual(100, actual.length);
      assertEqual(0, actual[0].value);
      assertEqual(1, actual[1].value);
      assertEqual(2, actual[2].value);
      assertEqual(3, actual[3].value);
      assertEqual(50, actual[50].value);
      assertEqual(98, actual[98].value);
      assertEqual(99, actual[99].value);
      
      var explain = getQueryExplanation(query);
      assertEqual("for", explain[0].type);
      assertEqual("filter", explain[1].type); 
      assertEqual("sort", explain[2].type); // cannot use index for sorting
      assertEqual("return", explain[3].type);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief check multiple sorts
////////////////////////////////////////////////////////////////////////////////

    testNonFieldSort1 : function () {
      collection.ensureSkiplist("value");

      var query = "FOR c IN " + cn + " FILTER c.value >= 0 SORT c.value + 1 RETURN c";

      var actual = getQueryResults(query);
      assertEqual(100, actual.length);
      assertEqual(0, actual[0].value);
      assertEqual(1, actual[1].value);
      assertEqual(2, actual[2].value);
      assertEqual(3, actual[3].value);
      assertEqual(50, actual[50].value);
      assertEqual(98, actual[98].value);
      assertEqual(99, actual[99].value);
      
      var explain = getQueryExplanation(query);
      assertEqual("for", explain[0].type);
      assertEqual("filter", explain[1].type); 
      assertEqual("sort", explain[2].type); // sort still there
      assertEqual("return", explain[3].type);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief check multiple sorts
////////////////////////////////////////////////////////////////////////////////

    testNonFieldSort2 : function () {
      collection.ensureSkiplist("value");

      var query = "FOR c IN " + cn + " FILTER c.value >= 0 SORT 1 + c.value RETURN c";

      var actual = getQueryResults(query);
      assertEqual(100, actual.length);
      assertEqual(0, actual[0].value);
      assertEqual(1, actual[1].value);
      assertEqual(2, actual[2].value);
      assertEqual(3, actual[3].value);
      assertEqual(50, actual[50].value);
      assertEqual(98, actual[98].value);
      assertEqual(99, actual[99].value);
      
      var explain = getQueryExplanation(query);
      assertEqual("for", explain[0].type);
      assertEqual("filter", explain[1].type); 
      assertEqual("sort", explain[2].type); // sort still there
      assertEqual("return", explain[3].type);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief check multiple sorts
////////////////////////////////////////////////////////////////////////////////

    testNonFieldSort3 : function () {
      collection.ensureSkiplist("value");

      var query = "FOR c IN " + cn + " FILTER c.value >= 0 SORT c.value * 2 RETURN c";

      var actual = getQueryResults(query);
      assertEqual(100, actual.length);
      assertEqual(0, actual[0].value);
      assertEqual(1, actual[1].value);
      assertEqual(2, actual[2].value);
      assertEqual(3, actual[3].value);
      assertEqual(50, actual[50].value);
      assertEqual(98, actual[98].value);
      assertEqual(99, actual[99].value);
      
      var explain = getQueryExplanation(query);
      assertEqual("for", explain[0].type);
      assertEqual("filter", explain[1].type); 
      assertEqual("sort", explain[2].type); // sort still there
      assertEqual("return", explain[3].type);
    }

  }
}

////////////////////////////////////////////////////////////////////////////////
/// @brief executes the test suite
////////////////////////////////////////////////////////////////////////////////

jsunity.run(ahuacatlQueryOptimiserSortTestSuite);

return jsunity.done();

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