package activity

import (
	"context"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
)

var testCtx = context.Background()

func TestExtractEntities_WikiLinks(t *testing.T) {
	sa := NewSynthesisActivities(nil) // No client needed for extraction
	entities, err := sa.ExtractEntitiesActivity(testCtx, "chunk-1", "Deploy [[Kubernetes]] with [[ArgoCD]]")
	assert.NoError(t, err)

	names := entityNames(entities)
	assert.Contains(t, names, "Kubernetes")
	assert.Contains(t, names, "ArgoCD")

	// Wiki links get high confidence
	for _, e := range entities {
		if e.Name == "Kubernetes" || e.Name == "ArgoCD" {
			assert.Equal(t, 0.95, e.Confidence)
			assert.Equal(t, "reference", e.EntityType)
		}
	}
}

func TestExtractEntities_ProperNouns(t *testing.T) {
	sa := NewSynthesisActivities(nil)
	entities, err := sa.ExtractEntitiesActivity(testCtx, "chunk-2", "Redis runs on Ubuntu Server")
	assert.NoError(t, err)

	names := entityNames(entities)
	assert.Contains(t, names, "Redis")
	assert.Contains(t, names, "Ubuntu Server")
}

func TestExtractEntities_TechnicalTerms(t *testing.T) {
	sa := NewSynthesisActivities(nil)
	entities, err := sa.ExtractEntitiesActivity(testCtx, "chunk-3", "Set MAX_RETRIES and use camelCase variables")
	assert.NoError(t, err)

	names := entityNames(entities)
	assert.Contains(t, names, "MAX_RETRIES")
	assert.Contains(t, names, "camelCase")
}

func TestExtractEntities_Deduplication(t *testing.T) {
	sa := NewSynthesisActivities(nil)
	entities, err := sa.ExtractEntitiesActivity(testCtx, "chunk-4", "[[Redis]] uses Redis for caching")
	assert.NoError(t, err)

	count := 0
	for _, e := range entities {
		if e.Name == "Redis" {
			count++
		}
	}
	assert.Equal(t, 1, count, "Redis should appear only once")
}

func TestExtractFacts_VerbPatterns(t *testing.T) {
	sa := NewSynthesisActivities(nil)
	entities := []ExtractedEntity{
		{Name: "Kubernetes", EntityType: "tool"},
		{Name: "Docker", EntityType: "tool"},
	}
	facts, err := sa.ExtractFactsActivity(testCtx, "chunk-5",
		"Kubernetes uses Docker for container runtime. Redis depends on TCP",
		entities)
	assert.NoError(t, err)
	assert.Greater(t, len(facts), 0)

	// Find the "uses" fact
	found := false
	for _, f := range facts {
		if f.Predicate == "uses" && f.Subject == "Kubernetes" {
			found = true
			assert.Greater(t, f.Confidence, 0.7) // Boosted by known entities
		}
	}
	assert.True(t, found, "should find Kubernetes uses Docker fact")
}

func TestExtractFacts_EmptyText(t *testing.T) {
	sa := NewSynthesisActivities(nil)
	facts, err := sa.ExtractFactsActivity(testCtx, "chunk-6", "", nil)
	assert.NoError(t, err)
	assert.Empty(t, facts)
}

func TestContradicts(t *testing.T) {
	assert.True(t, contradicts("Kubernetes uses port 8080", ExtractedFact{
		Subject: "Kubernetes", Predicate: "uses_port", Object: "9090",
	}))

	assert.False(t, contradicts("Kubernetes uses port 8080", ExtractedFact{
		Subject: "Kubernetes", Predicate: "uses_port", Object: "8080",
	}))
}

func TestContainsSubject(t *testing.T) {
	assert.True(t, containsSubject("Kubernetes runs on Linux", "kubernetes"))
	assert.False(t, containsSubject("Docker runs on Linux", "kubernetes"))
}

func TestIsCommonWord(t *testing.T) {
	assert.True(t, isCommonWord("The"))
	assert.True(t, isCommonWord("This"))
	assert.False(t, isCommonWord("Kubernetes"))
	assert.False(t, isCommonWord("Redis"))
}

func TestClassifyEntity(t *testing.T) {
	assert.Equal(t, "tool", classifyEntity("Kubernetes"))
	assert.Equal(t, "tool", classifyEntity("Docker"))
	assert.Equal(t, "tool", classifyEntity("Redis"))
	assert.Equal(t, "concept", classifyEntity("SomeRandomThing"))
}

// --- Tests for ExtractFactsActivity Validation ---

func TestExtractFacts_WithValidation(t *testing.T) {
	sa := NewSynthesisActivities(nil)
	// Test with very long object that should be truncated
	longText := "Kubernetes uses " + strings.Repeat("very long object name that should be truncated ", 20)
	entities := []ExtractedEntity{}

	facts, err := sa.ExtractFactsActivity(testCtx, "chunk-1", longText, entities)
	assert.NoError(t, err)

	// Verify no fact has object > 500 chars
	for _, f := range facts {
		assert.LessOrEqual(t, len(f.Object), 500, "object should be truncated to 500 chars")
	}
}

func TestExtractFacts_SkipsEmpty(t *testing.T) {
	sa := NewSynthesisActivities(nil)
	// Text with empty patterns that would extract nothing
	text := "Something uses  and other things"
	entities := []ExtractedEntity{}

	facts, err := sa.ExtractFactsActivity(testCtx, "chunk-1", text, entities)
	assert.NoError(t, err)

	// Verify no empty facts
	for _, f := range facts {
		assert.NotEmpty(t, f.Subject, "subject should not be empty")
		assert.NotEmpty(t, f.Object, "object should not be empty")
	}
}

func TestPersistSynthesis_EmptyInput(t *testing.T) {
	// Test that empty input is handled (no entities or facts to persist)
	// Note: This test requires a mock memory service; for now we just test structure
	input := PersistInput{
		ChunkID:        "chunk-123",
		Project:        "test",
		Source:         "test://1",
		Kind:           "L1",
		Entities:       []ExtractedEntity{}, // Empty
		Facts:          []ExtractedFact{},  // Empty
		Contradictions: []ContradictionResult{},
	}

	// Verify input structure is valid
	assert.Equal(t, "chunk-123", input.ChunkID)
	assert.Equal(t, 0, len(input.Entities))
	assert.Equal(t, 0, len(input.Facts))
}

// helper
func entityNames(entities []ExtractedEntity) []string {
	names := make([]string, len(entities))
	for i, e := range entities {
		names[i] = e.Name
	}
	return names
}