package fleprocess

/*
Copyright © 2020 Jean-Marc Meessen, ON4KJM <on4kjm@gmail.com>

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.
*/

import (
	"fmt"
	"testing"
	"time"
)

func TestInferTimeBlock_full_happyCase(t *testing.T) {
	//Given
	recordNumber := 4

	logLine1 := LogLine{}
	logLine1.Date = "2020-05-24"
	logLine1.Time = "1401"
	logLine1.ActualTime = "1401"

	logLine2 := LogLine{}
	logLine2.Date = "2020-05-24"
	logLine2.Time = "1401"

	logLine3 := LogLine{}
	logLine3.Date = "2020-05-24"
	logLine3.Time = "1410"
	logLine3.ActualTime = "1410"

	//When
	tb := InferTimeBlock{}
	isEndGap, err := tb.storeTimeGap(logLine1, recordNumber)
	if isEndGap == true || err != nil {
		t.Error("Unexpected results processing logline 1")
	}

	isEndGap, err = tb.storeTimeGap(logLine2, recordNumber+1)
	if isEndGap == true || err != nil {
		t.Error("Unexpected results processing logline 2")
	}

	isEndGap, err = tb.storeTimeGap(logLine3, recordNumber+2)
	if isEndGap == false || err != nil {
		t.Error("Unexpected results processing logline 3")
	}

	err = tb.finalizeTimeGap()
	if err != nil {
		t.Errorf("Unexpected error finalizing the timeGap")
	}

	fmt.Println(tb.String())

	//Then
	expectedCount := 1
	if tb.noTimeCount != expectedCount {
		t.Errorf("Unexpected number of missing records: %d, expected %d", tb.noTimeCount, expectedCount)
	}

	expectedInterval := time.Duration(time.Second * 270)
	if tb.deltatime != expectedInterval {
		t.Errorf("Unexpected interval: %d, expected %d", tb.deltatime, expectedInterval)
	}

	expectedLastRecordedTime := time.Date(2020, time.May, 24, 14, 01, 0, 0, time.UTC)
	if tb.lastRecordedTime != expectedLastRecordedTime {
		t.Errorf("Unexpected last recorded time: %s, expected %s", tb.lastRecordedTime, expectedLastRecordedTime)
	}

	expectedNextValidTime := time.Date(2020, time.May, 24, 14, 10, 0, 0, time.UTC)
	if tb.nextValidTime != expectedNextValidTime {
		t.Errorf("Unexpected last recorded time: %s, expected %s", tb.nextValidTime, expectedNextValidTime)
	}
}

func TestInferTimeBlock_display_happyCase(t *testing.T) {
	//Given
	tb := InferTimeBlock{}
	tb.lastRecordedTime = time.Date(2020, time.May, 24, 14, 01, 0, 0, time.UTC)
	tb.nextValidTime = time.Date(2020, time.May, 24, 14, 10, 10, 0, time.UTC)
	tb.noTimeCount = 1

	//When
	buffer1 := tb.String()

	if tb.finalizeTimeGap() != nil {
		t.Error("Unexpected error")
	}

	buffer2 := tb.String()

	//Then
	expectedBuffer1 := "Last Recorded Time:                 2020-05-24 1401\nnext Recorded Time:                 2020-05-24 1410\nLog position of last recorded time: 0\nNbr of entries without time:        1\nComputed interval:                  0s\n"
	expectedBuffer2 := "Last Recorded Time:                 2020-05-24 1401\nnext Recorded Time:                 2020-05-24 1410\nLog position of last recorded time: 0\nNbr of entries without time:        1\nComputed interval:                  275s\n"

	if buffer1 != expectedBuffer1 {
		t.Errorf("Not the expected display: got: \n%s\n while expecting: \n%s\n", buffer1, expectedBuffer1)
	}
	if buffer2 != expectedBuffer2 {
		t.Errorf("Not the expected finalized display: got: \n%s\n while expecting: \n%s\n", buffer2, expectedBuffer2)
	}
}

func TestInferTimeBlock_computeGaps_invalidData(t *testing.T) {
	//Given
	tb := InferTimeBlock{}

	//When
	err := tb.finalizeTimeGap()

	//Then
	if err == nil {
		t.Error("Should have failed with an error")
	}
	if err.Error() != "gap start time is empty" {
		t.Error("Did not not fail with the expected error.")
	}
}

func TestInferTimeBlock_computeGaps_missingEnTime(t *testing.T) {
	//Given
	tb := InferTimeBlock{}
	tb.lastRecordedTime = time.Date(2020, time.May, 24, 14, 01, 0, 0, time.UTC)

	//When
	err := tb.finalizeTimeGap()

	//Then
	if err == nil {
		t.Error("Should have failed with an error")
	}
	if err.Error() != "gap end time is empty" {
		t.Errorf("Did not not fail with the expected error. Failed with %s", err)
	}
}

func TestInferTimeBlock_computeGaps_negativeDifference(t *testing.T) {
	//Given
	tb := InferTimeBlock{}
	tb.lastRecordedTime = time.Date(2020, time.May, 24, 14, 10, 0, 0, time.UTC)
	tb.nextValidTime = time.Date(2020, time.May, 24, 14, 01, 10, 0, time.UTC)

	//When
	err := tb.finalizeTimeGap()

	//Then
	if err == nil {
		t.Error("Should have failed with an error")
	}
	if err.Error() != "gap start time is later than the Gap end time" {
		t.Errorf("Did not not fail with the expected error. Failed with %s", err)
	}
}

func TestInferTimeBlock_computeGaps_noDifference(t *testing.T) {
	//Given
	tb := InferTimeBlock{}
	tb.lastRecordedTime = time.Date(2020, time.May, 24, 14, 00, 0, 0, time.UTC)
	tb.nextValidTime = time.Date(2020, time.May, 24, 14, 00, 00, 0, time.UTC)
	tb.noTimeCount = 2

	//When
	err := tb.finalizeTimeGap()

	//Then
	if err != nil {
		t.Errorf("Should not have failed with an error (%s)", err)
	}
}

func TestInferTimeBlock_computeGaps_happyCase(t *testing.T) {
	//Given
	tb := InferTimeBlock{}
	tb.lastRecordedTime = time.Date(2020, time.May, 24, 14, 01, 0, 0, time.UTC)
	tb.nextValidTime = time.Date(2020, time.May, 24, 14, 10, 10, 0, time.UTC)
	tb.noTimeCount = 1

	//When
	err := tb.finalizeTimeGap()

	//Then
	if err != nil {
		t.Error("Should not have failed")
	}

	//TODO: add some other validation
}

func TestInferTimeBlock_startsNewBlock(t *testing.T) {
	// Given
	logLine := LogLine{}
	logLine.Date = "2020-05-24"
	logLine.Time = "1401"
	logLine.ActualTime = "1401"

	recordNbr := 4

	tb := InferTimeBlock{}

	// When
	isEndGap, err := tb.storeTimeGap(logLine, recordNbr)

	// Then
	if err != nil {
		t.Errorf("Unexpected error: %s", err)
	}
	if isEndGap == true {
		t.Errorf("Result is true while expecting false")
	}
	if tb.lastRecordedTime != time.Date(2020, time.May, 24, 14, 01, 0, 0, time.UTC) {
		t.Errorf("Not the expected lastRecordedTime")
	}
	if tb.noTimeCount != 0 {
		t.Errorf("nTimeCount should be 0, but is %d", tb.noTimeCount)
	}
	if tb.logFilePosition != recordNbr {
		t.Errorf("logFilePosition not set correctly: is %d while expecting %d", tb.logFilePosition, recordNbr)
	}
}

func TestInferTimeBlock_incrementCounter(t *testing.T) {
	// Given
	logLine := LogLine{}
	logLine.Date = "2020-05-24"
	logLine.Time = "1401"

	recordNbr := 4

	tb := InferTimeBlock{}
	tb.lastRecordedTime = time.Date(2020, time.May, 24, 14, 01, 0, 0, time.UTC)
	tb.logFilePosition = recordNbr

	// When
	isEndGap, err := tb.storeTimeGap(logLine, recordNbr)

	// Then
	if err != nil {
		t.Errorf("Unexpected error: %s", err)
	}
	if isEndGap == true {
		t.Errorf("Result is true while expecting false")
	}
	if tb.lastRecordedTime != time.Date(2020, time.May, 24, 14, 01, 0, 0, time.UTC) {
		t.Errorf("Not the expected lastRecordedTime")
	}
	if tb.noTimeCount != 1 {
		t.Errorf("nTimeCount should be 1, but is %d", tb.noTimeCount)
	}
	if tb.logFilePosition != recordNbr {
		t.Errorf("logFilePosition not set correctly: is %d while expecting %d", tb.logFilePosition, recordNbr)
	}
}

func TestInferTimeBlock_increment_missingLastTime(t *testing.T) {
	// Given
	logLine := LogLine{}
	logLine.Date = "2020-05-24"
	logLine.Time = "1401"

	recordNbr := 4

	tb := InferTimeBlock{}
	//tb.lastRecordedTime = time.Date(2020, time.May, 24, 14, 01, 0, 0, time.UTC)
	tb.logFilePosition = recordNbr

	// When
	isEndGap, err := tb.storeTimeGap(logLine, recordNbr)

	// Then
	if err.Error() != "gap start time is empty" {
		t.Errorf("Unexpected error: %s", err)
	}
	if isEndGap == true {
		t.Errorf("Result is true while expecting false")
	}
}

func TestInferTimeBlock_increment_alreadyDefinedNewTime(t *testing.T) {
	// Given
	logLine := LogLine{}
	logLine.Date = "2020-05-24"
	logLine.Time = "1401"

	recordNbr := 4

	tb := InferTimeBlock{}
	tb.lastRecordedTime = time.Date(2020, time.May, 24, 14, 01, 0, 0, time.UTC)
	tb.nextValidTime = time.Date(2020, time.May, 24, 14, 01, 0, 0, time.UTC)
	tb.logFilePosition = recordNbr

	// When
	isEndGap, err := tb.storeTimeGap(logLine, recordNbr)

	// Then
	if err.Error() != "gap end time is not empty" {
		t.Errorf("Unexpected error: %s", err)
	}
	if isEndGap == true {
		t.Errorf("Result is true while expecting false")
	}
}