package services

import (
	"testing"

	"go.uber.org/zap"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
)

func TestNewFullTextSearchService(t *testing.T) {
	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
	if err != nil {
		t.Fatalf("Failed to open database: %v", err)
	}

	logger := zap.NewNop()
	service := NewFullTextSearchService(db, logger)

	if service == nil {
		t.Error("NewFullTextSearchService() returned nil")
	}
	if service.db == nil {
		t.Error("NewFullTextSearchService() returned service with nil db")
	}
	if service.logger == nil {
		t.Error("NewFullTextSearchService() returned service with nil logger")
	}
}

func TestFullTextSearchService_prepareSearchQuery(t *testing.T) {
	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
	if err != nil {
		t.Fatalf("Failed to open database: %v", err)
	}

	service := NewFullTextSearchService(db, zap.NewNop())

	tests := []struct {
		name     string
		query    string
		expected string // Expected to contain certain patterns
	}{
		{
			name:     "simple query",
			query:    "test",
			expected: "test",
		},
		{
			name:     "multiple words",
			query:    "test query",
			expected: "test & query",
		},
		{
			name:     "empty query",
			query:    "",
			expected: "",
		},
		{
			name:     "query with special characters",
			query:    "test-query!",
			expected: "test-query!",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result := service.prepareSearchQuery(tt.query)
			if tt.query == "" && result != "" {
				t.Errorf("prepareSearchQuery(%q) = %q, expected empty string", tt.query, result)
			}
			if tt.query != "" && result == "" {
				t.Errorf("prepareSearchQuery(%q) = %q, expected non-empty", tt.query, result)
			}
		})
	}
}

func TestFullTextSearchService_SearchParams_Defaults(t *testing.T) {
	params := SearchParams{}

	// Test that defaults are applied in Search method
	// This is more of an integration test, but we can test the logic
	if params.Page < 1 {
		params.Page = 1
	}
	if params.Limit < 1 {
		params.Limit = 20
	}
	if params.Limit > 100 {
		params.Limit = 100
	}

	if params.Page != 1 {
		t.Errorf("Expected default page 1, got %d", params.Page)
	}
	if params.Limit != 20 {
		t.Errorf("Expected default limit 20, got %d", params.Limit)
	}
}

func TestContainsString(t *testing.T) {
	tests := []struct {
		name  string
		slice []string
		item  string
		want  bool
	}{
		{
			name:  "contains item",
			slice: []string{"track", "user", "playlist"},
			item:  "user",
			want:  true,
		},
		{
			name:  "does not contain item",
			slice: []string{"track", "user", "playlist"},
			item:  "album",
			want:  false,
		},
		{
			name:  "empty slice",
			slice: []string{},
			item:  "track",
			want:  false,
		},
		{
			name:  "case sensitive",
			slice: []string{"track", "user"},
			item:  "Track",
			want:  false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := containsString(tt.slice, tt.item)
			if got != tt.want {
				t.Errorf("containsString(%v, %q) = %v, want %v", tt.slice, tt.item, got, tt.want)
			}
		})
	}
}

// Note: Full integration tests would require:
// 1. A real PostgreSQL database with the search indexes
// 2. Test data (tracks, users, playlists)
// 3. Verification of tsvector/tsquery functionality
//
// Example integration test structure:
// func TestFullTextSearchService_Search_Integration(t *testing.T) {
//     // Setup test database with PostgreSQL
//     db := setupTestDB(t)
//     defer cleanupTestDB(t, db)
//
//     // Create test data
//     createTestTracks(t, db)
//     createTestUsers(t, db)
//     createTestPlaylists(t, db)
//
//     service := NewFullTextSearchService(db, zap.NewNop())
//
//     ctx := context.Background()
//     params := SearchParams{
//         Query: "test",
//         Page:  1,
//         Limit: 10,
//     }
//
//     result, err := service.Search(ctx, params)
//     if err != nil {
//         t.Fatalf("Search() error = %v", err)
//     }
//
//     if len(result.Tracks) == 0 && len(result.Users) == 0 && len(result.Playlists) == 0 {
//         t.Error("Search() returned no results")
//     }
// }