/**
 *    Copyright (C) 2014 MongoDB Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

/**
 * This file contains tests for mongo/db/commands/mr.h
 */

#include "mongo/db/commands/mr.h"

#include <string>

#include "mongo/db/json.h"
#include "mongo/unittest/unittest.h"

using namespace mongo;

namespace {

    /**
     * Tests for mr::Config
     */

    /**
     * Helper function to verify field of mr::Config::OutputOptions.
     */
    template <typename T> void _compareOutputOptionField(const std::string& dbname,
                                                         const std::string& cmdObjStr,
                                                         const std::string& fieldName,
                                                         const T& actual, const T& expected) {
        if (actual == expected) return;
        FAIL(str::stream() << "parseOutputOptions(\"" << dbname << ", " << cmdObjStr << "): "
                           << fieldName << ": Expected: " << expected << ". Actual: " << actual);
    }

    /**
     * Returns string representation of mr::Config::OutputType
     */
    std::string _getOutTypeString(mr::Config::OutputType outType) {
        switch (outType) {
        case mr::Config::REPLACE: return "REPLACE";
        case mr::Config::MERGE: return "MERGE";
        case mr::Config::REDUCE: return "REDUCE";
        case mr::Config::INMEMORY: return "INMEMORY";
        }
        invariant(0);
    }

    /**
     * Test helper function to check expected result of parseOutputOptions.
     */
    void _testConfigParseOutputOptions(const std::string& dbname, const std::string& cmdObjStr,
                                       const std::string& expectedOutDb,
                                       const std::string& expectedCollectionName,
                                       const std::string& expectedFinalNamespace,
                                       bool expectedOutNonAtomic,
                                       mr::Config::OutputType expectedOutType) {
        const BSONObj cmdObj = fromjson(cmdObjStr);
        mr::Config::OutputOptions outputOptions = mr::Config::parseOutputOptions(dbname, cmdObj);
        _compareOutputOptionField(dbname, cmdObjStr, "outDb", outputOptions.outDB, expectedOutDb);
        _compareOutputOptionField(dbname, cmdObjStr, "collectionName",
                                  outputOptions.collectionName, expectedCollectionName);
        _compareOutputOptionField(dbname, cmdObjStr, "finalNamespace",
                                  outputOptions.finalNamespace, expectedFinalNamespace);
        _compareOutputOptionField(dbname, cmdObjStr, "outNonAtomic", outputOptions.outNonAtomic,
                                  expectedOutNonAtomic);
        _compareOutputOptionField(dbname, cmdObjStr, "outType",
                                  _getOutTypeString(outputOptions.outType),
                                  _getOutTypeString(expectedOutType));
    }

    /**
     * Tests for mr::Config::parseOutputOptions.
     */
    TEST(ConfigOutputOptionsTest, parseOutputOptions) {
        // Missing 'out' field.
        ASSERT_THROWS(mr::Config::parseOutputOptions("mydb", fromjson("{}")), UserException);
        // 'out' must be either string or object.
        ASSERT_THROWS(mr::Config::parseOutputOptions("mydb", fromjson("{out: 99}")),
                      UserException);
        // 'out.nonAtomic' is not supported with normal, replace or inline.
        ASSERT_THROWS(mr::Config::parseOutputOptions(
                          "mydb",
                          fromjson("{out: {normal: 'mycoll', nonAtomic: true}}")),
                      UserException);
        ASSERT_THROWS(mr::Config::parseOutputOptions(
                          "mydb",
                          fromjson("{out: {replace: 'mycoll', nonAtomic: true}}")),
                      UserException);
        ASSERT_THROWS(mr::Config::parseOutputOptions(
                          "mydb",
                          fromjson("{out: {inline: 'mycoll', nonAtomic: true}}")),
                      UserException);
        // Unknown output specifer.
        ASSERT_THROWS(mr::Config::parseOutputOptions(
                          "mydb",
                          fromjson("{out: {no_such_out_type: 'mycoll'}}")),
                      UserException);


        // 'out' is string.
        _testConfigParseOutputOptions("mydb", "{out: 'mycoll'}",
                                      "", "mycoll", "mydb.mycoll", false, mr::Config::REPLACE);
        // 'out' is object.
        _testConfigParseOutputOptions("mydb", "{out: {normal: 'mycoll'}}",
                                      "", "mycoll", "mydb.mycoll", false, mr::Config::REPLACE);
        // 'out.db' overrides dbname parameter
        _testConfigParseOutputOptions("mydb1", "{out: {replace: 'mycoll', db: 'mydb2'}}",
                                      "mydb2", "mycoll", "mydb2.mycoll", false,
                                      mr::Config::REPLACE);
        // 'out.nonAtomic' is supported with merge and reduce.
        _testConfigParseOutputOptions("mydb", "{out: {merge: 'mycoll', nonAtomic: true}}",
                                      "", "mycoll", "mydb.mycoll", true, mr::Config::MERGE);
        _testConfigParseOutputOptions("mydb", "{out: {reduce: 'mycoll', nonAtomic: true}}",
                                      "", "mycoll", "mydb.mycoll", true, mr::Config::REDUCE);
        // inline
        _testConfigParseOutputOptions("mydb1", "{out: {inline: 'mycoll', db: 'mydb2'}}",
                                      "mydb2", "", "", false, mr::Config::INMEMORY);

        // Order should not matter in fields of 'out' object.
        _testConfigParseOutputOptions("mydb1", "{out: {db: 'mydb2', normal: 'mycoll'}}",
                                      "mydb2", "mycoll", "mydb2.mycoll", false,
                                      mr::Config::REPLACE);
        _testConfigParseOutputOptions("mydb1", "{out: {db: 'mydb2', replace: 'mycoll'}}",
                                      "mydb2", "mycoll", "mydb2.mycoll", false,
                                      mr::Config::REPLACE);
        _testConfigParseOutputOptions("mydb1", "{out: {nonAtomic: true, merge: 'mycoll'}}",
                                      "", "mycoll", "mydb1.mycoll", true,
                                      mr::Config::MERGE);
        _testConfigParseOutputOptions("mydb1", "{out: {nonAtomic: true, reduce: 'mycoll'}}",
                                      "", "mycoll", "mydb1.mycoll", true,
                                      mr::Config::REDUCE);
        _testConfigParseOutputOptions("mydb1", "{out: {db: 'mydb2', inline: 'mycoll'}}",
                                      "mydb2", "", "", false, mr::Config::INMEMORY);
    }

}  // namespace