package engine

import (
	"testing"

	"git.kingecg.top/kingecg/gomog/pkg/types"
)

// TestAggregationPipelineIntegration 测试聚合管道集成
func TestAggregationPipelineIntegration(t *testing.T) {
	store := NewMemoryStore(nil)
	collection := "test.agg_integration"

	CreateTestCollectionForTesting(store, collection, map[string]types.Document{
		"doc1": {ID: "doc1", Data: map[string]interface{}{"category": "A", "score": 85, "quantity": 10}},
		"doc2": {ID: "doc2", Data: map[string]interface{}{"category": "A", "score": 92, "quantity": 5}},
		"doc3": {ID: "doc3", Data: map[string]interface{}{"category": "B", "score": 78, "quantity": 15}},
		"doc4": {ID: "doc4", Data: map[string]interface{}{"category": "B", "score": 95, "quantity": 8}},
	})

	aggEngine := &AggregationEngine{store: store}

	tests := []struct {
		name        string
		pipeline    []types.AggregateStage
		expectedLen int
	}{
		{
			name: "match and group with sum",
			pipeline: []types.AggregateStage{
				{Stage: "$match", Spec: types.Filter{"score": types.Filter{"$gte": float64(80)}}},
				{
					Stage: "$group",
					Spec: map[string]interface{}{
						"_id":   "$category",
						"total": map[string]interface{}{"$sum": "$quantity"},
					},
				},
			},
			expectedLen: 2,
		},
		{
			name: "project with switch expression",
			pipeline: []types.AggregateStage{
				{
					Stage: "$project",
					Spec: map[string]interface{}{
						"category": 1,
						"grade": map[string]interface{}{
							"$switch": map[string]interface{}{
								"branches": []interface{}{
									map[string]interface{}{
										"case": map[string]interface{}{
											"$gte": []interface{}{"$score", float64(90)},
										},
										"then": "A",
									},
									map[string]interface{}{
										"case": map[string]interface{}{
											"$gte": []interface{}{"$score", float64(80)},
										},
										"then": "B",
									},
								},
								"default": "C",
							},
						},
					},
				},
			},
			expectedLen: 4,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			results, err := aggEngine.Execute(collection, tt.pipeline)
			if err != nil {
				t.Fatalf("Execute() error = %v", err)
			}

			if len(results) != tt.expectedLen {
				t.Errorf("Expected %d results, got %d", tt.expectedLen, len(results))
			}
		})
	}
}

// TestQueryWithExprAndJsonSchema 测试 $expr 和 $jsonSchema 组合查询
func TestQueryWithExprAndJsonSchema(t *testing.T) {
	store := NewMemoryStore(nil)
	collection := "test.expr_schema_integration"

	CreateTestCollectionForTesting(store, collection, map[string]types.Document{
		"doc1": {ID: "doc1", Data: map[string]interface{}{"name": "Alice", "age": 25, "salary": 5000.0, "bonus": 1000.0}},
		"doc2": {ID: "doc2", Data: map[string]interface{}{"name": "Bob", "age": 30, "salary": 6000.0, "bonus": 500.0}},
		"doc3": {ID: "doc3", Data: map[string]interface{}{"name": "Charlie", "age": 35, "salary": 7000.0, "bonus": 2000.0}},
	})

	tests := []struct {
		name        string
		filter      types.Filter
		expectedLen int
	}{
		{
			name: "$expr with field comparison",
			filter: types.Filter{
				"$expr": types.Filter{
					"$gt": []interface{}{"$bonus", map[string]interface{}{
						"$multiply": []interface{}{"$salary", float64(0.1)},
					}},
				},
			},
			expectedLen: 2,
		},
		{
			name: "$jsonSchema validation",
			filter: types.Filter{
				"$jsonSchema": map[string]interface{}{
					"bsonType": "object",
					"required": []interface{}{"name", "age"},
					"properties": map[string]interface{}{
						"name": map[string]interface{}{"bsonType": "string"},
						"age":  map[string]interface{}{"bsonType": "int", "minimum": float64(0)},
					},
				},
			},
			expectedLen: 3,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			results, err := store.Find(collection, tt.filter)
			if err != nil {
				t.Fatalf("Find() error = %v", err)
			}

			if len(results) != tt.expectedLen {
				t.Errorf("Expected %d results, got %d", tt.expectedLen, len(results))
			}
		})
	}
}

// TestComplexAggregationPipeline 测试复杂聚合管道
func TestComplexAggregationPipeline(t *testing.T) {
	store := NewMemoryStore(nil)
	collection := "test.complex_agg"

	CreateTestCollectionForTesting(store, collection, map[string]types.Document{
		"doc1": {ID: "doc1", Data: map[string]interface{}{"status": "A", "qty": 10, "price": 5.5}},
		"doc2": {ID: "doc2", Data: map[string]interface{}{"status": "A", "qty": 20, "price": 3.0}},
		"doc3": {ID: "doc3", Data: map[string]interface{}{"status": "B", "qty": 15, "price": 4.0}},
		"doc4": {ID: "doc4", Data: map[string]interface{}{"status": "B", "qty": 5, "price": 6.0}},
	})

	engine := &AggregationEngine{store: store}

	pipeline := []types.AggregateStage{
		{Stage: "$match", Spec: types.Filter{"status": "A"}},
		{
			Stage: "$addFields",
			Spec: map[string]interface{}{
				"total": map[string]interface{}{
					"$multiply": []interface{}{"$qty", "$price"},
				},
			},
		},
		{
			Stage: "$group",
			Spec: map[string]interface{}{
				"_id":      "$status",
				"avgTotal": map[string]interface{}{"$avg": "$total"},
				"maxTotal": map[string]interface{}{"$max": "$total"},
			},
		},
	}

	results, err := engine.Execute(collection, pipeline)
	if err != nil {
		t.Fatalf("Execute() error = %v", err)
	}

	if len(results) != 1 {
		t.Errorf("Expected 1 result, got %d", len(results))
	}

	result := results[0].Data
	if _, exists := result["avgTotal"]; !exists {
		t.Error("Expected 'avgTotal' field")
	}
	if _, exists := result["maxTotal"]; !exists {
		t.Error("Expected 'maxTotal' field")
	}
}