package dgraph

import (
	"fmt"
	"testing"

	"lol.mleku.dev/chk"
	"next.orly.dev/pkg/encoders/event"
	"next.orly.dev/pkg/encoders/filter"
	"next.orly.dev/pkg/encoders/hex"
	"next.orly.dev/pkg/encoders/kind"
	"next.orly.dev/pkg/encoders/tag"
	"next.orly.dev/pkg/encoders/timestamp"
	"next.orly.dev/pkg/interfaces/signer/p8k"
	"next.orly.dev/pkg/utils"
)

func TestQueryEventsByID(t *testing.T) {
	db, events, ctx, cancel, tempDir := setupTestDB(t)
	defer cleanupTestDB(t, db, cancel, tempDir)

	// Test QueryEvents with an ID filter
	testEvent := events[3]

	evs, err := db.QueryEvents(
		ctx, &filter.F{
			Ids: tag.NewFromBytesSlice(testEvent.ID),
		},
	)
	if err != nil {
		t.Fatalf("Failed to query events by ID: %v", err)
	}

	// Verify we got exactly one event
	if len(evs) != 1 {
		t.Fatalf("Expected 1 event, got %d", len(evs))
	}

	// Verify it's the correct event
	if !utils.FastEqual(evs[0].ID, testEvent.ID) {
		t.Fatalf(
			"Event ID doesn't match. Got %x, expected %x", evs[0].ID,
			testEvent.ID,
		)
	}
}

func TestQueryEventsByKind(t *testing.T) {
	db, _, ctx, cancel, tempDir := setupTestDB(t)
	defer cleanupTestDB(t, db, cancel, tempDir)

	// Test querying by kind
	testKind := kind.New(1) // Kind 1 is typically text notes
	kindFilter := kind.NewS(testKind)

	evs, err := db.QueryEvents(
		ctx, &filter.F{
			Kinds: kindFilter,
			Tags:  tag.NewS(),
		},
	)
	if err != nil {
		t.Fatalf("Failed to query events by kind: %v", err)
	}

	// Verify we got results
	if len(evs) == 0 {
		t.Fatal("Expected events with kind 1, but got none")
	}

	// Verify all events have the correct kind
	for i, ev := range evs {
		if ev.Kind != testKind.K {
			t.Fatalf(
				"Event %d has incorrect kind. Got %d, expected %d", i,
				ev.Kind, testKind.K,
			)
		}
	}
}

func TestQueryEventsByAuthor(t *testing.T) {
	db, events, ctx, cancel, tempDir := setupTestDB(t)
	defer cleanupTestDB(t, db, cancel, tempDir)

	// Test querying by author
	authorFilter := tag.NewFromBytesSlice(events[1].Pubkey)

	evs, err := db.QueryEvents(
		ctx, &filter.F{
			Authors: authorFilter,
		},
	)
	if err != nil {
		t.Fatalf("Failed to query events by author: %v", err)
	}

	// Verify we got results
	if len(evs) == 0 {
		t.Fatal("Expected events from author, but got none")
	}

	// Verify all events have the correct author
	for i, ev := range evs {
		if !utils.FastEqual(ev.Pubkey, events[1].Pubkey) {
			t.Fatalf(
				"Event %d has incorrect author. Got %x, expected %x",
				i, ev.Pubkey, events[1].Pubkey,
			)
		}
	}
}

func TestReplaceableEventsAndDeletion(t *testing.T) {
	db, events, ctx, cancel, tempDir := setupTestDB(t)
	defer cleanupTestDB(t, db, cancel, tempDir)

	// Create a signer
	sign := p8k.MustNew()
	if err := sign.Generate(); chk.E(err) {
		t.Fatal(err)
	}

	// Create a replaceable event
	replaceableEvent := event.New()
	replaceableEvent.Kind = kind.ProfileMetadata.K        // Kind 0 is replaceable
	replaceableEvent.Pubkey = events[0].Pubkey            // Use the same pubkey as an existing event
	replaceableEvent.CreatedAt = timestamp.Now().V - 7200 // 2 hours ago
	replaceableEvent.Content = []byte("Original profile")
	replaceableEvent.Tags = tag.NewS()
	replaceableEvent.Sign(sign)

	// Save the replaceable event
	if _, err := db.SaveEvent(ctx, replaceableEvent); err != nil {
		t.Fatalf("Failed to save replaceable event: %v", err)
	}

	// Create a newer version of the replaceable event
	newerEvent := event.New()
	newerEvent.Kind = kind.ProfileMetadata.K        // Same kind
	newerEvent.Pubkey = replaceableEvent.Pubkey     // Same pubkey
	newerEvent.CreatedAt = timestamp.Now().V - 3600 // 1 hour ago (newer than the original)
	newerEvent.Content = []byte("Updated profile")
	newerEvent.Tags = tag.NewS()
	newerEvent.Sign(sign)

	// Save the newer event
	if _, err := db.SaveEvent(ctx, newerEvent); err != nil {
		t.Fatalf("Failed to save newer event: %v", err)
	}

	// Query for the original event by ID
	evs, err := db.QueryEvents(
		ctx, &filter.F{
			Ids: tag.NewFromAny(replaceableEvent.ID),
		},
	)
	if err != nil {
		t.Fatalf("Failed to query for replaced event by ID: %v", err)
	}

	// Verify the original event is still found (it's kept but not returned in general queries)
	if len(evs) != 1 {
		t.Fatalf("Expected 1 event when querying for replaced event by ID, got %d", len(evs))
	}

	// Verify it's the original event
	if !utils.FastEqual(evs[0].ID, replaceableEvent.ID) {
		t.Fatalf(
			"Event ID doesn't match when querying for replaced event. Got %x, expected %x",
			evs[0].ID, replaceableEvent.ID,
		)
	}

	// Query for all events of this kind and pubkey
	kindFilter := kind.NewS(kind.ProfileMetadata)
	authorFilter := tag.NewFromAny(replaceableEvent.Pubkey)

	evs, err = db.QueryEvents(
		ctx, &filter.F{
			Kinds:   kindFilter,
			Authors: authorFilter,
		},
	)
	if err != nil {
		t.Fatalf("Failed to query for replaceable events: %v", err)
	}

	// Verify we got only one event (the latest one)
	if len(evs) != 1 {
		t.Fatalf(
			"Expected 1 event when querying for replaceable events, got %d",
			len(evs),
		)
	}

	// Verify it's the newer event
	if !utils.FastEqual(evs[0].ID, newerEvent.ID) {
		t.Fatalf(
			"Event ID doesn't match when querying for replaceable events. Got %x, expected %x",
			evs[0].ID, newerEvent.ID,
		)
	}

	// Test deletion events
	// Create a deletion event that references the replaceable event
	deletionEvent := event.New()
	deletionEvent.Kind = kind.Deletion.K           // Kind 5 is deletion
	deletionEvent.Pubkey = replaceableEvent.Pubkey // Same pubkey as the event being deleted
	deletionEvent.CreatedAt = timestamp.Now().V    // Current time
	deletionEvent.Content = []byte("Deleting the replaceable event")
	deletionEvent.Tags = tag.NewS()
	deletionEvent.Sign(sign)

	// Add an e-tag referencing the replaceable event
	*deletionEvent.Tags = append(
		*deletionEvent.Tags,
		tag.NewFromAny("e", hex.Enc(replaceableEvent.ID)),
	)

	// Save the deletion event
	if _, err = db.SaveEvent(ctx, deletionEvent); err != nil {
		t.Fatalf("Failed to save deletion event: %v", err)
	}

	// Query for all events of this kind and pubkey again
	evs, err = db.QueryEvents(
		ctx, &filter.F{
			Kinds:   kindFilter,
			Authors: authorFilter,
		},
	)
	if err != nil {
		t.Fatalf(
			"Failed to query for replaceable events after deletion: %v", err,
		)
	}

	// Verify we still get the newer event (deletion should only affect the original event)
	if len(evs) != 1 {
		t.Fatalf(
			"Expected 1 event when querying for replaceable events after deletion, got %d",
			len(evs),
		)
	}

	// Verify it's still the newer event
	if !utils.FastEqual(evs[0].ID, newerEvent.ID) {
		t.Fatalf(
			"Event ID doesn't match after deletion. Got %x, expected %x",
			evs[0].ID, newerEvent.ID,
		)
	}

	// Query for the original event by ID
	evs, err = db.QueryEvents(
		ctx, &filter.F{
			Ids: tag.NewFromBytesSlice(replaceableEvent.ID),
		},
	)
	if err != nil {
		t.Fatalf("Failed to query for deleted event by ID: %v", err)
	}

	// Verify the original event is not found (it was deleted)
	if len(evs) != 0 {
		t.Fatalf("Expected 0 events when querying for deleted event by ID, got %d", len(evs))
	}
}

func TestParameterizedReplaceableEventsAndDeletion(t *testing.T) {
	db, events, ctx, cancel, tempDir := setupTestDB(t)
	defer cleanupTestDB(t, db, cancel, tempDir)

	sign := p8k.MustNew()
	if err := sign.Generate(); chk.E(err) {
		t.Fatal(err)
	}

	// Create a parameterized replaceable event
	paramEvent := event.New()
	paramEvent.Kind = 30000                         // Kind 30000+ is parameterized replaceable
	paramEvent.Pubkey = events[0].Pubkey            // Use the same pubkey as an existing event
	paramEvent.CreatedAt = timestamp.Now().V - 7200 // 2 hours ago
	paramEvent.Content = []byte("Original parameterized event")
	paramEvent.Tags = tag.NewS()
	// Add a d-tag
	*paramEvent.Tags = append(
		*paramEvent.Tags, tag.NewFromAny([]byte{'d'}, []byte("test-d-tag")),
	)
	paramEvent.Sign(sign)

	// Save the parameterized replaceable event
	if _, err := db.SaveEvent(ctx, paramEvent); err != nil {
		t.Fatalf("Failed to save parameterized replaceable event: %v", err)
	}

	// Create a deletion event using e-tag
	paramDeletionEvent := event.New()
	paramDeletionEvent.Kind = kind.Deletion.K        // Kind 5 is deletion
	paramDeletionEvent.Pubkey = paramEvent.Pubkey    // Same pubkey as the event being deleted
	paramDeletionEvent.CreatedAt = timestamp.Now().V // Current time
	paramDeletionEvent.Content = []byte("Deleting the parameterized replaceable event with e-tag")
	paramDeletionEvent.Tags = tag.NewS()
	// Add an e-tag referencing the parameterized replaceable event
	*paramDeletionEvent.Tags = append(
		*paramDeletionEvent.Tags,
		tag.NewFromAny("e", []byte(hex.Enc(paramEvent.ID))),
	)
	paramDeletionEvent.Sign(sign)

	// Save the parameterized deletion event with e-tag
	if _, err := db.SaveEvent(ctx, paramDeletionEvent); err != nil {
		t.Fatalf(
			"Failed to save parameterized deletion event with e-tag: %v", err,
		)
	}

	// Query for parameterized events
	paramKindFilter := kind.NewS(kind.New(paramEvent.Kind))
	paramAuthorFilter := tag.NewFromBytesSlice(paramEvent.Pubkey)

	evs, err := db.QueryEvents(
		ctx, &filter.F{
			Kinds:   paramKindFilter,
			Authors: paramAuthorFilter,
		},
	)
	if err != nil {
		t.Fatalf(
			"Failed to query for parameterized replaceable events after deletion: %v",
			err,
		)
	}

	// Debug output
	fmt.Printf("Got %d events after deletion\n", len(evs))
	for i, ev := range evs {
		fmt.Printf(
			"Event %d: kind=%d, pubkey=%s\n",
			i, ev.Kind, hex.Enc(ev.Pubkey),
		)
	}

	// Verify we get no events (since the only one was deleted)
	if len(evs) != 0 {
		t.Fatalf(
			"Expected 0 events when querying for deleted parameterized replaceable events, got %d",
			len(evs),
		)
	}

	// Query for the parameterized event by ID
	evs, err = db.QueryEvents(
		ctx, &filter.F{
			Ids: tag.NewFromBytesSlice(paramEvent.ID),
		},
	)
	if err != nil {
		t.Fatalf(
			"Failed to query for deleted parameterized event by ID: %v", err,
		)
	}

	// Verify the deleted event is not found when querying by ID
	if len(evs) != 0 {
		t.Fatalf(
			"Expected 0 events when querying for deleted parameterized event by ID, got %d",
			len(evs),
		)
	}
}

func TestQueryEventsByTimeRange(t *testing.T) {
	db, events, ctx, cancel, tempDir := setupTestDB(t)
	defer cleanupTestDB(t, db, cancel, tempDir)

	// Test querying by time range
	// Use the timestamp from the middle event as a reference
	middleIndex := len(events) / 2
	middleEvent := events[middleIndex]

	// Create a timestamp range that includes events before and after the middle event
	sinceTime := new(timestamp.T)
	sinceTime.V = middleEvent.CreatedAt - 3600 // 1 hour before middle event

	untilTime := new(timestamp.T)
	untilTime.V = middleEvent.CreatedAt + 3600 // 1 hour after middle event

	evs, err := db.QueryEvents(
		ctx, &filter.F{
			Since: sinceTime,
			Until: untilTime,
		},
	)
	if err != nil {
		t.Fatalf("Failed to query events by time range: %v", err)
	}

	// Verify we got results
	if len(evs) == 0 {
		t.Fatal("Expected events in time range, but got none")
	}

	// Verify all events are within the time range
	for i, ev := range evs {
		if ev.CreatedAt < sinceTime.V || ev.CreatedAt > untilTime.V {
			t.Fatalf(
				"Event %d is outside the time range. Got %d, expected between %d and %d",
				i, ev.CreatedAt, sinceTime.V, untilTime.V,
			)
		}
	}
}

func TestQueryEventsByTag(t *testing.T) {
	db, events, ctx, cancel, tempDir := setupTestDB(t)
	defer cleanupTestDB(t, db, cancel, tempDir)

	// Find an event with tags to use for testing
	var testTagEvent *event.E
	for _, ev := range events {
		if ev.Tags != nil && ev.Tags.Len() > 0 {
			// Find a tag with at least 2 elements and first element of length 1
			for _, tag := range *ev.Tags {
				if tag.Len() >= 2 && len(tag.Key()) == 1 {
					testTagEvent = ev
					break
				}
			}
			if testTagEvent != nil {
				break
			}
		}
	}

	if testTagEvent == nil {
		t.Skip("No suitable event with tags found for testing")
		return
	}

	// Get the first tag with at least 2 elements and first element of length 1
	var testTag *tag.T
	for _, tag := range *testTagEvent.Tags {
		if tag.Len() >= 2 && len(tag.Key()) == 1 {
			testTag = tag
			break
		}
	}

	// Create a tags filter with the test tag
	tagsFilter := tag.NewS(testTag)

	evs, err := db.QueryEvents(
		ctx, &filter.F{
			Tags: tagsFilter,
		},
	)
	if err != nil {
		t.Fatalf("Failed to query events by tag: %v", err)
	}

	// Verify we got results
	if len(evs) == 0 {
		t.Fatal("Expected events with tag, but got none")
	}

	// Verify all events have the tag
	for i, ev := range evs {
		var hasTag bool
		for _, tag := range *ev.Tags {
			if tag.Len() >= 2 && len(tag.Key()) == 1 {
				if utils.FastEqual(tag.Key(), testTag.Key()) &&
					utils.FastEqual(tag.Value(), testTag.Value()) {
					hasTag = true
					break
				}
			}
		}
		if !hasTag {
			t.Fatalf("Event %d does not have the expected tag", i)
		}
	}
}

func TestCountEvents(t *testing.T) {
	db, _, ctx, cancel, tempDir := setupTestDB(t)
	defer cleanupTestDB(t, db, cancel, tempDir)

	// Test counting all events
	count, _, err := db.CountEvents(ctx, &filter.F{})
	if err != nil {
		t.Fatalf("Failed to count events: %v", err)
	}

	// Verify we got a non-zero count
	if count == 0 {
		t.Fatal("Expected non-zero event count, but got 0")
	}

	t.Logf("Total events in database: %d", count)

	// Test counting events by kind
	testKind := kind.New(1)
	kindFilter := kind.NewS(testKind)

	count, _, err = db.CountEvents(
		ctx, &filter.F{
			Kinds: kindFilter,
		},
	)
	if err != nil {
		t.Fatalf("Failed to count events by kind: %v", err)
	}

	t.Logf("Events with kind 1: %d", count)
}