package memory

import (
	"context"
	"testing"
	"time"

	"git.pyer.club/kingecg/gotidb/pkg/engine"
)

func TestMemoryEngine(t *testing.T) {
	// 创建引擎配置
	config := engine.NewEngineConfig()

	// 创建内存引擎
	eng, err := NewMemoryEngine(config)
	if err != nil {
		t.Fatalf("Failed to create memory engine: %v", err)
	}

	// 打开引擎
	if err := eng.Open(); err != nil {
		t.Fatalf("Failed to open engine: %v", err)
	}
	defer eng.Close()

	// 测试写入单个数据点
	t.Run("WritePoint", func(t *testing.T) {
		point := engine.DataPoint{
			DeviceID:   "device001",
			MetricCode: "temperature",
			Labels: map[string]string{
				"location": "room1",
			},
			Value:     25.5,
			Timestamp: time.Now().UnixNano(),
		}

		if err := eng.WritePoint(context.Background(), point); err != nil {
			t.Fatalf("Failed to write point: %v", err)
		}

		// 刷新缓冲区确保数据写入
		if err := eng.Flush(); err != nil {
			t.Fatalf("Failed to flush: %v", err)
		}

		// 查询最新数据
		query := engine.NewQueryBuilder().
			ForMetric("temperature").
			WithTag("location", engine.OpEqual, "room1").
			Build()
		query.Type = engine.QueryTypeLatest

		result, err := eng.Query(context.Background(), query)
		if err != nil {
			t.Fatalf("Failed to query latest data: %v", err)
		}

		tsResult, ok := result.(*engine.TimeSeriesResult)
		if !ok {
			t.Fatalf("Expected TimeSeriesResult, got %T", result)
		}

		if len(tsResult.Points) != 1 {
			t.Fatalf("Expected 1 point, got %d", len(tsResult.Points))
		}

		if tsResult.Points[0].Value != 25.5 {
			t.Errorf("Expected value 25.5, got %.2f", tsResult.Points[0].Value)
		}
	})

	// 测试批量写入
	t.Run("WriteBatch", func(t *testing.T) {
		now := time.Now()
		var points []engine.DataPoint
		for i := 0; i < 10; i++ {
			points = append(points, engine.DataPoint{
				DeviceID:   "device002",
				MetricCode: "cpu",
				Labels: map[string]string{
					"host": "server1",
				},
				Value:     float64(i * 10),
				Timestamp: now.Add(time.Duration(i) * time.Second).UnixNano(),
			})
		}

		if err := eng.WriteBatch(context.Background(), points); err != nil {
			t.Fatalf("Failed to write batch: %v", err)
		}

		// 查询原始数据
		query := engine.NewQueryBuilder().
			ForMetric("cpu").
			WithTimeRange(now.Add(-1*time.Hour).UnixNano(), now.Add(1*time.Hour).UnixNano()).
			WithTag("host", engine.OpEqual, "server1").
			Build()

		result, err := eng.Query(context.Background(), query)
		if err != nil {
			t.Fatalf("Failed to query raw data: %v", err)
		}

		tsResult, ok := result.(*engine.TimeSeriesResult)
		if !ok {
			t.Fatalf("Expected TimeSeriesResult, got %T", result)
		}

		if len(tsResult.Points) != 10 {
			t.Fatalf("Expected 10 points, got %d", len(tsResult.Points))
		}
	})

	// 测试聚合查询
	t.Run("AggregateQuery", func(t *testing.T) {
		now := time.Now()
		var points []engine.DataPoint
		for i := 0; i < 10; i++ {
			points = append(points, engine.DataPoint{
				DeviceID:   "device003",
				MetricCode: "memory",
				Labels: map[string]string{
					"host": "server2",
				},
				Value:     float64(i * 10),
				Timestamp: now.Add(time.Duration(i) * time.Second).UnixNano(),
			})
		}

		if err := eng.WriteBatch(context.Background(), points); err != nil {
			t.Fatalf("Failed to write batch: %v", err)
		}

		// 查询聚合数据
		query := engine.NewQueryBuilder().
			ForMetric("memory").
			WithTimeRange(now.Add(-1*time.Hour).UnixNano(), now.Add(1*time.Hour).UnixNano()).
			WithTag("host", engine.OpEqual, "server2").
			WithAggregation(engine.AggAvg, 1*time.Minute).
			Build()

		result, err := eng.Query(context.Background(), query)
		if err != nil {
			t.Fatalf("Failed to query aggregate data: %v", err)
		}

		aggResult, ok := result.(*engine.AggregateResult)
		if !ok {
			t.Fatalf("Expected AggregateResult, got %T", result)
		}

		if len(aggResult.Groups) == 0 {
			t.Fatalf("Expected at least one aggregate group")
		}
	})

	// 测试引擎统计信息
	t.Run("EngineStats", func(t *testing.T) {
		stats := eng.Stats()
		if stats.PointsCount == 0 {
			t.Errorf("Expected non-zero points count")
		}
	})

	// 测试引擎能力
	t.Run("EngineCapabilities", func(t *testing.T) {
		caps := eng.Capabilities()
		if !caps.SupportsCompression {
			t.Errorf("Expected compression support")
		}
		if caps.SupportsPersistence {
			t.Errorf("Memory engine should not support persistence")
		}
	})
}

func TestCircularBuffer(t *testing.T) {
	// 创建引擎配置
	config := engine.NewEngineConfig()
	memConfig := config.MemoryConfig()
	memConfig.MaxPointsPerSeries = 5 // 设置为较小的值以便测试

	// 创建内存引擎
	eng, err := NewMemoryEngine(config)
	if err != nil {
		t.Fatalf("Failed to create memory engine: %v", err)
	}

	// 打开引擎
	if err := eng.Open(); err != nil {
		t.Fatalf("Failed to open engine: %v", err)
	}
	defer eng.Close()

	// 写入超过缓冲区容量的数据点
	now := time.Now()
	var points []engine.DataPoint
	for i := 0; i < 10; i++ {
		points = append(points, engine.DataPoint{
			DeviceID:   "device004",
			MetricCode: "disk",
			Labels: map[string]string{
				"path": "/data",
			},
			Value:     float64(i),
			Timestamp: now.Add(time.Duration(i) * time.Second).UnixNano(),
		})
	}

	if err := eng.WriteBatch(context.Background(), points); err != nil {
		t.Fatalf("Failed to write batch: %v", err)
	}

	// 查询原始数据
	query := engine.NewQueryBuilder().
		ForMetric("disk").
		WithTimeRange(now.Add(-1*time.Hour).UnixNano(), now.Add(1*time.Hour).UnixNano()).
		WithTag("path", engine.OpEqual, "/data").
		Build()

	result, err := eng.Query(context.Background(), query)
	if err != nil {
		t.Fatalf("Failed to query raw data: %v", err)
	}

	tsResult, ok := result.(*engine.TimeSeriesResult)
	if !ok {
		t.Fatalf("Expected TimeSeriesResult, got %T", result)
	}

	// 应该只返回最近的5个点
	if len(tsResult.Points) != 5 {
		t.Fatalf("Expected 5 points (MaxPointsPerSeries), got %d", len(tsResult.Points))
	}

	// 检查返回的是最新的5个点
	for i, point := range tsResult.Points {
		expectedValue := float64(i + 5) // 5-9
		if point.Value != expectedValue {
			t.Errorf("Expected point value %.1f, got %.1f", expectedValue, point.Value)
		}
	}
}