package database

import (
	"testing"
	"time"

	"github.com/TwinProduction/gatus/core"
	"github.com/TwinProduction/gatus/storage/store/paging"
)

var (
	firstCondition  = core.Condition("[STATUS] == 200")
	secondCondition = core.Condition("[RESPONSE_TIME] < 500")
	thirdCondition  = core.Condition("[CERTIFICATE_EXPIRATION] < 72h")

	now = time.Now()

	testService = core.Service{
		Name:                    "name",
		Group:                   "group",
		URL:                     "https://example.org/what/ever",
		Method:                  "GET",
		Body:                    "body",
		Interval:                30 * time.Second,
		Conditions:              []*core.Condition{&firstCondition, &secondCondition, &thirdCondition},
		Alerts:                  nil,
		Insecure:                false,
		NumberOfFailuresInARow:  0,
		NumberOfSuccessesInARow: 0,
	}
	testSuccessfulResult = core.Result{
		Hostname:              "example.org",
		IP:                    "127.0.0.1",
		HTTPStatus:            200,
		Errors:                nil,
		Connected:             true,
		Success:               true,
		Timestamp:             now,
		Duration:              150 * time.Millisecond,
		CertificateExpiration: 10 * time.Hour,
		ConditionResults: []*core.ConditionResult{
			{
				Condition: "[STATUS] == 200",
				Success:   true,
			},
			{
				Condition: "[RESPONSE_TIME] < 500",
				Success:   true,
			},
			{
				Condition: "[CERTIFICATE_EXPIRATION] < 72h",
				Success:   true,
			},
		},
	}
	testUnsuccessfulResult = core.Result{
		Hostname:              "example.org",
		IP:                    "127.0.0.1",
		HTTPStatus:            200,
		Errors:                []string{"error-1", "error-2"},
		Connected:             true,
		Success:               false,
		Timestamp:             now,
		Duration:              750 * time.Millisecond,
		CertificateExpiration: 10 * time.Hour,
		ConditionResults: []*core.ConditionResult{
			{
				Condition: "[STATUS] == 200",
				Success:   true,
			},
			{
				Condition: "[RESPONSE_TIME] < 500",
				Success:   false,
			},
			{
				Condition: "[CERTIFICATE_EXPIRATION] < 72h",
				Success:   false,
			},
		},
	}
)

func TestNewStore(t *testing.T) {
	if _, err := NewStore("", "TestNewStore.db"); err != ErrDatabaseDriverNotSpecified {
		t.Error("expected error due to blank driver parameter")
	}
	if _, err := NewStore("sqlite", ""); err != ErrFilePathNotSpecified {
		t.Error("expected error due to blank path parameter")
	}
	if store, err := NewStore("sqlite", t.TempDir()+"/TestNewStore.db"); err != nil {
		t.Error("shouldn't have returned any error, got", err.Error())
	} else {
		_ = store.db.Close()
	}
}

func TestStore_InsertCleansUpOldUptimeEntriesProperly(t *testing.T) {
	store, _ := NewStore("sqlite", t.TempDir()+"/TestStore_InsertCleansUpOldUptimeEntriesProperly.db")
	defer store.Close()
	now := time.Now().Round(time.Minute)
	now = time.Date(now.Year(), now.Month(), now.Day(), now.Hour(), 0, 0, 0, now.Location())

	store.Insert(&testService, &core.Result{Timestamp: now.Add(-5 * time.Hour), Success: true})

	tx, _ := store.db.Begin()
	oldest, _ := store.getAgeOfOldestServiceUptimeEntry(tx, 1)
	_ = tx.Commit()
	if oldest.Truncate(time.Hour) != 5*time.Hour {
		t.Errorf("oldest service uptime entry should've been ~5 hours old, was %s", oldest)
	}

	// The oldest cache entry should remain at ~5 hours old, because this entry is more recent
	store.Insert(&testService, &core.Result{Timestamp: now.Add(-3 * time.Hour), Success: true})

	tx, _ = store.db.Begin()
	oldest, _ = store.getAgeOfOldestServiceUptimeEntry(tx, 1)
	_ = tx.Commit()
	if oldest.Truncate(time.Hour) != 5*time.Hour {
		t.Errorf("oldest service uptime entry should've been ~5 hours old, was %s", oldest)
	}

	// The oldest cache entry should now become at ~8 hours old, because this entry is older
	store.Insert(&testService, &core.Result{Timestamp: now.Add(-8 * time.Hour), Success: true})

	tx, _ = store.db.Begin()
	oldest, _ = store.getAgeOfOldestServiceUptimeEntry(tx, 1)
	_ = tx.Commit()
	if oldest.Truncate(time.Hour) != 8*time.Hour {
		t.Errorf("oldest service uptime entry should've been ~8 hours old, was %s", oldest)
	}

	// Since this is one hour before reaching the clean up threshold, the oldest entry should now be this one
	store.Insert(&testService, &core.Result{Timestamp: now.Add(-(uptimeCleanUpThreshold - time.Hour)), Success: true})

	tx, _ = store.db.Begin()
	oldest, _ = store.getAgeOfOldestServiceUptimeEntry(tx, 1)
	_ = tx.Commit()
	if oldest.Truncate(time.Hour) != uptimeCleanUpThreshold-time.Hour {
		t.Errorf("oldest service uptime entry should've been ~%s hours old, was %s", uptimeCleanUpThreshold-time.Hour, oldest)
	}

	// Since this entry is after the uptimeCleanUpThreshold, both this entry as well as the previous
	// one should be deleted since they both surpass uptimeRetention
	store.Insert(&testService, &core.Result{Timestamp: now.Add(-(uptimeCleanUpThreshold + time.Hour)), Success: true})

	tx, _ = store.db.Begin()
	oldest, _ = store.getAgeOfOldestServiceUptimeEntry(tx, 1)
	_ = tx.Commit()
	if oldest.Truncate(time.Hour) != 8*time.Hour {
		t.Errorf("oldest service uptime entry should've been ~8 hours old, was %s", oldest)
	}
}

func TestStore_InsertCleansUpEventsAndResultsProperly(t *testing.T) {
	store, _ := NewStore("sqlite", t.TempDir()+"/TestStore_InsertCleansUpEventsAndResultsProperly.db")
	defer store.Close()
	for i := 0; i < resultsCleanUpThreshold+eventsCleanUpThreshold; i++ {
		store.Insert(&testService, &testSuccessfulResult)
		store.Insert(&testService, &testUnsuccessfulResult)
		ss := store.GetServiceStatusByKey(testService.Key(), paging.NewServiceStatusParams().WithResults(1, core.MaximumNumberOfResults*5).WithEvents(1, core.MaximumNumberOfEvents*5))
		if len(ss.Results) > resultsCleanUpThreshold+1 {
			t.Errorf("number of results shouldn't have exceeded %d, reached %d", resultsCleanUpThreshold, len(ss.Results))
		}
		if len(ss.Events) > eventsCleanUpThreshold+1 {
			t.Errorf("number of events shouldn't have exceeded %d, reached %d", eventsCleanUpThreshold, len(ss.Events))
		}
	}
	store.Clear()
}