//go:build performance

package face

import (
	"context"
	"fmt"
	"os"
	"testing"
	"time"
)

// BenchmarkFaceDetection benchmarks face detection performance
func BenchmarkFaceDetection(b *testing.B) {
	if os.Getenv("AWS_REGION") == "" {
		b.Skip("AWS_REGION not set, skipping performance test")
	}

	cfg, err := loadAWSConfig()
	if err != nil {
		b.Fatalf("failed to load AWS config: %v", err)
	}

	collectionID := os.Getenv("REKOGNITION_COLLECTION")
	if collectionID == "" {
		collectionID = "hatch-faces-perf"
	}

	client := NewRekognitionClient(cfg, collectionID)
	ctx := context.Background()

	// Load test image
	imageBytes, err := loadTestImage("test/fixtures/images/face.jpg")
	if err != nil {
		b.Fatalf("failed to load test image: %v", err)
	}

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		_, err := client.DetectFaces(ctx, imageBytes)
		if err != nil {
			b.Fatalf("failed to detect faces: %v", err)
		}
	}
}

// BenchmarkFaceIndexing benchmarks face indexing performance
func BenchmarkFaceIndexing(b *testing.B) {
	if os.Getenv("AWS_REGION") == "" {
		b.Skip("AWS_REGION not set, skipping performance test")
	}

	cfg, err := loadAWSConfig()
	if err != nil {
		b.Fatalf("failed to load AWS config: %v", err)
	}

	collectionID := os.Getenv("REKOGNITION_COLLECTION")
	if collectionID == "" {
		collectionID = "hatch-faces-perf"
	}

	client := NewRekognitionClient(cfg, collectionID)
	ctx := context.Background()

	// Create collection
	if err := client.CreateCollection(ctx, collectionID); err != nil {
		b.Fatalf("failed to create collection: %v", err)
	}
	defer client.DeleteCollection(ctx, collectionID)

	// Load test image
	imageBytes, err := loadTestImage("test/fixtures/images/face.jpg")
	if err != nil {
		b.Fatalf("failed to load test image: %v", err)
	}

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		photoID := fmt.Sprintf("perf-test-%d", time.Now().UnixNano())
		_, err := client.IndexFace(ctx, imageBytes, photoID)
		if err != nil {
			b.Fatalf("failed to index face: %v", err)
		}
	}
}

// BenchmarkFaceSearch benchmarks face search performance
func BenchmarkFaceSearch(b *testing.B) {
	if os.Getenv("AWS_REGION") == "" {
		b.Skip("AWS_REGION not set, skipping performance test")
	}

	cfg, err := loadAWSConfig()
	if err != nil {
		b.Fatalf("failed to load AWS config: %v", err)
	}

	collectionID := os.Getenv("REKOGNITION_COLLECTION")
	if collectionID == "" {
		collectionID = "hatch-faces-perf"
	}

	client := NewRekognitionClient(cfg, collectionID)
	ctx := context.Background()

	// Create collection
	if err := client.CreateCollection(ctx, collectionID); err != nil {
		b.Fatalf("failed to create collection: %v", err)
	}
	defer client.DeleteCollection(ctx, collectionID)

	// Load and index test image
	imageBytes, err := loadTestImage("test/fixtures/images/face.jpg")
	if err != nil {
		b.Fatalf("failed to load test image: %v", err)
	}

	photoID := "perf-search-" + time.Now().Format("20060102150405")
	_, err = client.IndexFace(ctx, imageBytes, photoID)
	if err != nil {
		b.Fatalf("failed to index face: %v", err)
	}

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		_, err := client.SearchFacesByImage(ctx, imageBytes, 10, 80.0)
		if err != nil {
			b.Fatalf("failed to search faces: %v", err)
		}
	}
}

// TestPerformanceTargets validates performance targets
func TestPerformanceTargets(t *testing.T) {
	if os.Getenv("AWS_REGION") == "" {
		t.Skip("AWS_REGION not set, skipping performance test")
	}

	cfg, err := loadAWSConfig()
	if err != nil {
		t.Fatalf("failed to load AWS config: %v", err)
	}

	collectionID := os.Getenv("REKOGNITION_COLLECTION")
	if collectionID == "" {
		collectionID = "hatch-faces-perf"
	}

	client := NewRekognitionClient(cfg, collectionID)
	ctx := context.Background()

	// Create collection
	if err := client.CreateCollection(ctx, collectionID); err != nil {
		t.Fatalf("failed to create collection: %v", err)
	}
	defer client.DeleteCollection(ctx, collectionID)

	// Load test image
	imageBytes, err := loadTestImage("test/fixtures/images/face.jpg")
	if err != nil {
		t.Fatalf("failed to load test image: %v", err)
	}

	// Test face detection latency
	start := time.Now()
	_, err = client.DetectFaces(ctx, imageBytes)
	if err != nil {
		t.Fatalf("failed to detect faces: %v", err)
	}
	detectionLatency := time.Since(start)
	if detectionLatency > 2*time.Second {
		t.Errorf("face detection latency exceeded 2 seconds: %v", detectionLatency)
	}
	t.Logf("Face detection latency: %v", detectionLatency)

	// Test face indexing latency
	start = time.Now()
	photoID := "perf-target-" + time.Now().Format("20060102150405")
	_, err = client.IndexFace(ctx, imageBytes, photoID)
	if err != nil {
		t.Fatalf("failed to index face: %v", err)
	}
	indexingLatency := time.Since(start)
	if indexingLatency > 3*time.Second {
		t.Errorf("face indexing latency exceeded 3 seconds: %v", indexingLatency)
	}
	t.Logf("Face indexing latency: %v", indexingLatency)

	// Test face search latency
	start = time.Now()
	_, err = client.SearchFacesByImage(ctx, imageBytes, 10, 80.0)
	if err != nil {
		t.Fatalf("failed to search faces: %v", err)
	}
	searchLatency := time.Since(start)
	if searchLatency > 2*time.Second {
		t.Errorf("face search latency exceeded 2 seconds: %v", searchLatency)
	}
	t.Logf("Face search latency: %v", searchLatency)

	// Test end-to-end latency
	start = time.Now()
	// Detect
	_, err = client.DetectFaces(ctx, imageBytes)
	if err != nil {
		t.Fatalf("failed to detect faces: %v", err)
	}
	// Index
	photoID = "perf-e2e-" + time.Now().Format("20060102150405")
	_, err = client.IndexFace(ctx, imageBytes, photoID)
	if err != nil {
		t.Fatalf("failed to index face: %v", err)
	}
	// Search
	_, err = client.SearchFacesByImage(ctx, imageBytes, 10, 80.0)
	if err != nil {
		t.Fatalf("failed to search faces: %v", err)
	}
	e2eLatency := time.Since(start)
	if e2eLatency > 5*time.Second {
		t.Errorf("end-to-end latency exceeded 5 seconds: %v", e2eLatency)
	}
	t.Logf("End-to-end latency: %v", e2eLatency)
}