/**
 * Tests $dateDiff expression.
 * @tags: [
 * ]
 */
(function() {
"use strict";
load("jstests/libs/sbe_assert_error_override.js");
load("jstests/libs/aggregation_pipeline_utils.js");  // For executeAggregationTestCase.

const testDB = db.getSiblingDB(jsTestName());
const coll = testDB.collection;

// Drop the test database.
assert.commandWorked(testDB.dropDatabase());

const someDate = new Date("2020-11-01T18:23:36Z");
const aggregationPipelineWithDateDiff = [{
    $project: {
        _id: false,
        date_diff: {
            $dateDiff:
                {startDate: "$startDate", endDate: "$endDate", unit: "$unit", timezone: "$timeZone"}
        }
    }
}];
const aggregationPipelineWithDateDiffAndStartOfWeek = [{
    $project: {
        _id: false,
        date_diff: {
            $dateDiff: {
                startDate: "$startDate",
                endDate: "$endDate",
                unit: "$unit",
                timezone: "$timeZone",
                startOfWeek: "$startOfWeek"
            }
        }
    }
}];
const testCases = [
    {
        // Parameters are constants, timezone is not specified.
        pipeline: [{
            $project: {
                _id: true,
                date_diff: {
                    $dateDiff: {
                        startDate: new Date("2020-11-01T18:23:36Z"),
                        endDate: new Date("2020-11-02T00:00:00Z"),
                        unit: "hour"
                    }
                }
            }
        }],
        inputDocuments: [{_id: 1}],
        expectedResults: [{_id: 1, date_diff: NumberLong("6")}]
    },
    {
        // Parameters are field paths.
        pipeline: aggregationPipelineWithDateDiffAndStartOfWeek,
        inputDocuments: [{
            startDate: new Date("2020-11-01T18:23:36Z"),
            endDate: new Date("2020-11-02T00:00:00Z"),
            unit: "hour",
            timeZone: "America/New_York",
            startOfWeek: "IGNORED"  // Ignored when unit is not week.
        }],
        expectedResults: [{date_diff: NumberLong("6")}]
    },
    {
        // Parameters are field paths, 'timezone' is not specified.
        pipeline: [{
            $project: {
                _id: false,
                date_diff:
                    {$dateDiff: {startDate: "$startDate", endDate: "$endDate", unit: "$unit"}}
            }
        }],
        inputDocuments: [{
            startDate: new Date("2020-11-01T18:23:36Z"),
            endDate: new Date("2020-11-02T00:00:00Z"),
            unit: "hour"
        }],
        expectedResults: [{date_diff: NumberLong("6")}]
    },
    {
        // 'startDate' and 'endDate' are object ids.
        pipeline: [{
            $project: {
                _id: false,
                date_diff: {
                    $dateDiff: {
                        startDate: "$_id",
                        endDate: "$_id",
                        unit: "millisecond",
                        timezone: "America/New_York"
                    }
                }
            }
        }],
        inputDocuments: [{}],
        expectedResults: [{date_diff: NumberLong("0")}]
    },
    {
        // 'startDate' and 'endDate' are timestamps.
        pipeline: [{
            $project: {
                _id: false,
                date_diff: {$dateDiff: {startDate: "$ts", endDate: "$ts", unit: "millisecond"}}
            }
        }],
        inputDocuments: [{ts: new Timestamp()}],
        expectedResults: [{date_diff: NumberLong("0")}]
    },
    {
        // Invalid 'startDate' type.
        pipeline: aggregationPipelineWithDateDiff,
        inputDocuments: [{startDate: "string", endDate: someDate, unit: "hour", timeZone: "UTC"}],
        expectedErrorCode: 5166307,
    },
    {
        // Missing 'startDate' value in the document, invalid other fields.
        pipeline: aggregationPipelineWithDateDiff,
        inputDocuments: [{endDate: 1, unit: "century", timeZone: "INVALID"}],
        expectedResults: [{date_diff: null}],
    },
    {
        // Null 'startDate'.
        pipeline: aggregationPipelineWithDateDiff,
        inputDocuments: [{startDate: null, endDate: someDate, unit: "hour", timeZone: "UTC"}],
        expectedResults: [{date_diff: null}],
    },
    {
        // Invalid 'endDate' type.
        pipeline: aggregationPipelineWithDateDiff,
        inputDocuments: [{startDate: someDate, endDate: 1, unit: "hour", timeZone: "UTC"}],
        expectedErrorCode: 5166307,
    },
    {
        // Missing 'endDate' value in the document, invalid other fields.
        pipeline: aggregationPipelineWithDateDiff,
        inputDocuments: [{startDate: "", unit: "epoch", timeZone: "INVALID"}],
        expectedResults: [{date_diff: null}],
    },
    {
        // Null 'unit'.
        pipeline: aggregationPipelineWithDateDiff,
        inputDocuments: [{startDate: someDate, endDate: someDate, unit: null, timeZone: "UTC"}],
        expectedResults: [{date_diff: null}],
    },
    {
        // Missing 'unit' value in the document, invalid other fields.
        pipeline: aggregationPipelineWithDateDiff,
        inputDocuments: [{startDate: 1, endDate: 2, timeZone: "INVALID"}],
        expectedResults: [{date_diff: null}],
    },
    {
        // Invalid 'unit' type.
        pipeline: aggregationPipelineWithDateDiff,
        inputDocuments: [{startDate: someDate, endDate: someDate, unit: 5, timeZone: "UTC"}],
        expectedErrorCode: 5439013,
    },
    {
        // Invalid 'unit' value.
        pipeline: aggregationPipelineWithDateDiff,
        inputDocuments: [{startDate: someDate, endDate: someDate, unit: "decade", timeZone: "UTC"}],
        expectedErrorCode: ErrorCodes.FailedToParse,
    },
    {
        // Null 'timezone'.
        pipeline: aggregationPipelineWithDateDiff,
        inputDocuments: [{startDate: someDate, endDate: someDate, unit: "hour", timeZone: null}],
        expectedResults: [{date_diff: null}],
    },
    {
        // Missing 'timezone' value in the document, invalid other fields. Result could be a null
        // answer or an error code depending whether pipeline is optimized.
        pipeline: aggregationPipelineWithDateDiff,
        inputDocuments: [{startDate: 1, endDate: 2, unit: "century"}],
        expectedResults: [{date_diff: null}],
        expectedErrorCode: ErrorCodes.FailedToParse,
    },
    {
        // Invalid 'timezone' type.
        pipeline: aggregationPipelineWithDateDiff,
        inputDocuments: [{startDate: someDate, endDate: someDate, unit: "hour", timeZone: 1}],
        expectedErrorCode: 40517,
    },
    {
        // Invalid 'timezone' value.
        pipeline: aggregationPipelineWithDateDiff,
        inputDocuments:
            [{startDate: someDate, endDate: someDate, unit: "hour", timeZone: "America/Invalid"}],
        expectedErrorCode: 40485,
    },
    {
        // Specified 'startOfWeek'.
        pipeline: aggregationPipelineWithDateDiffAndStartOfWeek,
        inputDocuments: [{
            startDate: new Date("2021-01-24T18:23:36Z"),  // Sunday.
            endDate: new Date("2021-01-25T02:23:36Z"),    // Monday.
            unit: "week",
            timeZone: "GMT",
            startOfWeek: "MONDAY"
        }],
        expectedResults: [{date_diff: NumberLong("1")}],
    },
    {
        // Specified 'startOfWeek' and timezone.
        pipeline: aggregationPipelineWithDateDiffAndStartOfWeek,
        inputDocuments: [{
            startDate: new Date("2021-01-17T05:00:00Z"),  // Sunday in New York.
            endDate: new Date("2021-01-17T04:59:00Z"),    // Saturday in New York.
            unit: "week",
            timeZone: "America/New_York",
            startOfWeek: "sunday"
        }],
        expectedResults: [{date_diff: NumberLong("-1")}],
    },
    {
        // Unspecified 'startOfWeek' - defaults to Sunday.
        pipeline: [{
            $project: {
                _id: false,
                date_diff: {$dateDiff: {startDate: "$startDate", endDate: "$endDate", unit: "week"}}
            }
        }],
        inputDocuments: [{
            startDate: new Date("2021-01-24T18:23:36Z"),  // Sunday.
            endDate: new Date("2021-01-25T02:23:36Z"),    // Monday.
        }],
        expectedResults: [{date_diff: NumberLong("0")}],
    },
    {
        // Null 'startOfWeek'.
        pipeline: aggregationPipelineWithDateDiffAndStartOfWeek,
        inputDocuments: [{startDate: someDate, endDate: someDate, unit: "week", startOfWeek: null}],
        expectedResults: [{date_diff: null}],
    },
    {
        // Missing 'startOfWeek' value in the document, invalid other fields.
        pipeline: aggregationPipelineWithDateDiffAndStartOfWeek,
        inputDocuments: [{startDate: 1, endDate: 2, unit: "week", timeZone: 1}],
        expectedResults: [{date_diff: null}],
    },
    {
        // Invalid 'startOfWeek' type.
        pipeline: aggregationPipelineWithDateDiffAndStartOfWeek,
        inputDocuments: [
            {startDate: someDate, endDate: someDate, unit: "week", timeZone: "GMT", startOfWeek: 1}
        ],
        expectedErrorCode: 5439015,
    },
    {
        // Invalid 'startOfWeek' type, unit is not the week.
        pipeline: aggregationPipelineWithDateDiffAndStartOfWeek,
        inputDocuments: [
            {startDate: someDate, endDate: someDate, unit: "hour", timeZone: "GMT", startOfWeek: 1}
        ],
        expectedResults: [{date_diff: NumberLong("0")}],
    },
    {
        // Invalid 'startOfWeek' value.
        pipeline: aggregationPipelineWithDateDiffAndStartOfWeek,
        inputDocuments: [{
            startDate: someDate,
            endDate: someDate,
            unit: "week",
            timeZone: "GMT",
            startOfWeek: "FRIDIE"
        }],
        expectedErrorCode: 5439016,
    }
];
testCases.forEach(testCase => executeAggregationTestCase(coll, testCase));
}());