package benchmarks

import (
	"testing"

	"github.com/jfraeys/fetch_ml/internal/queue"
)

// BenchmarkNativeQueueRebuildIndex profiles the native binary queue index.
// Tier 1 C++ candidate: binary format vs JSON
// Expected: 5x speedup, 99% allocation reduction
func BenchmarkNativeQueueRebuildIndex(b *testing.B) {
	if !queue.UseNativeQueue {
		b.Skip("Native queue not enabled (set FETCHML_NATIVE_LIBS=1 or build with -tags native_libs)")
	}

	tmpDir := b.TempDir()
	q, err := queue.NewNativeQueue(tmpDir)
	if err != nil {
		b.Fatal(err)
	}
	defer q.Close()

	// Seed with tasks
	for i := 0; i < 100; i++ {
		task := &queue.Task{
			ID:       "task-" + string(rune('0'+i/10)) + string(rune('0'+i%10)),
			JobName:  "job-" + string(rune('0'+i/10)),
			Priority: int64(100 - i),
		}
		if err := q.AddTask(task); err != nil {
			b.Fatal(err)
		}
	}

	b.ResetTimer()
	b.ReportAllocs()

	// Benchmark just the add (native uses binary index, no JSON rebuild)
	for i := 0; i < b.N; i++ {
		task := &queue.Task{
			ID:       "bench-task-" + string(rune('0'+i%10)),
			JobName:  "bench-job",
			Priority: int64(i),
		}
		if err := q.AddTask(task); err != nil {
			b.Fatal(err)
		}
	}
}

// BenchmarkNativeQueueClaimNext profiles task claiming from binary heap
func BenchmarkNativeQueueClaimNext(b *testing.B) {
	if !queue.UseNativeQueue {
		b.Skip("Native queue not enabled (set FETCHML_NATIVE_LIBS=1 or build with -tags native_libs)")
	}

	tmpDir := b.TempDir()
	q, err := queue.NewNativeQueue(tmpDir)
	if err != nil {
		b.Fatal(err)
	}
	defer q.Close()

	// Seed with tasks
	for i := 0; i < 100; i++ {
		task := &queue.Task{
			ID:       "task-" + string(rune('0'+i/10)) + string(rune('0'+i%10)),
			JobName:  "job-" + string(rune('0'+i/10)),
			Priority: int64(100 - i),
		}
		if err := q.AddTask(task); err != nil {
			b.Fatal(err)
		}
	}

	b.ResetTimer()
	b.ReportAllocs()

	for i := 0; i < b.N; i++ {
		// Binary heap pop - no JSON parsing
		_, _ = q.PeekNextTask()
	}
}

// BenchmarkNativeQueueGetAllTasks profiles full task scan from binary index
func BenchmarkNativeQueueGetAllTasks(b *testing.B) {
	if !queue.UseNativeQueue {
		b.Skip("Native queue not enabled (set FETCHML_NATIVE_LIBS=1 or build with -tags native_libs)")
	}

	tmpDir := b.TempDir()
	q, err := queue.NewNativeQueue(tmpDir)
	if err != nil {
		b.Fatal(err)
	}
	defer q.Close()

	// Seed with tasks
	for i := 0; i < 100; i++ {
		task := &queue.Task{
			ID:       "task-" + string(rune('0'+i/10)) + string(rune('0'+i%10)),
			JobName:  "job-" + string(rune('0'+i/10)),
			Priority: int64(100 - i),
		}
		if err := q.AddTask(task); err != nil {
			b.Fatal(err)
		}
	}

	b.ResetTimer()
	b.ReportAllocs()

	for i := 0; i < b.N; i++ {
		_, err := q.GetAllTasks()
		if err != nil {
			b.Fatal(err)
		}
	}
}