package meiliService

import (
	"encoding/xml"
	"fmt"
	"io"
	"os"
	"strconv"
	"strings"
	"time"

	"git.ma-al.com/goc_daniel/b2b/app/db"
	"git.ma-al.com/goc_daniel/b2b/app/model"
	constdata "git.ma-al.com/goc_daniel/b2b/app/utils/const_data"
	"github.com/meilisearch/meilisearch-go"
)

type MeiliService struct {
	meiliClient meilisearch.ServiceManager
}

func New() *MeiliService {
	meiliURL := os.Getenv("MEILISEARCH_URL")
	meiliAPIKey := os.Getenv("MEILISEARCH_API_KEY")

	client := meilisearch.New(
		meiliURL,
		meilisearch.WithAPIKey(meiliAPIKey),
	)

	return &MeiliService{
		meiliClient: client,
	}
}

// ====================================   FOR SUPERADMIN ONLY   ====================================
func (s *MeiliService) CreateIndex(id_lang uint) error {
	var products []model.ProductDescription

	err := db.DB.
		Table("ps_product_lang").
		Where("id_shop = ? AND id_lang = ?", constdata.SHOP_ID, id_lang).
		Scan(&products).Error
	if err != nil {
		return fmt.Errorf("database error: %w", err)
	}

	var meiliProducts []model.MeiliSearchProduct
	for i := 0; i < len(products); i++ {
		var nextMeiliProduct model.MeiliSearchProduct

		nextMeiliProduct.ProductID = products[i].ProductID
		nextMeiliProduct.Name = products[i].Name
		nextMeiliProduct.Description = cleanHTML(products[i].Description)
		nextMeiliProduct.DescriptionShort = cleanHTML(products[i].DescriptionShort)
		nextMeiliProduct.Usage = cleanHTML(products[i].Usage)

		meiliProducts = append(meiliProducts, nextMeiliProduct)
	}

	indexName := "meili_products_shop" + strconv.FormatInt(constdata.SHOP_ID, 10) + "_lang" + strconv.FormatInt(int64(id_lang), 10)
	primaryKey := "product_id"
	docOptions := &meilisearch.DocumentOptions{
		PrimaryKey:   &primaryKey,
		SkipCreation: false,
	}

	task, err := s.meiliClient.Index(indexName).AddDocuments(meiliProducts, docOptions)
	if err != nil {
		return fmt.Errorf("meili AddDocuments error: %w", err)
	}

	finishedTask, err := s.meiliClient.WaitForTask(task.TaskUID, 500*time.Millisecond)
	fmt.Printf("Task status: %s\n", finishedTask.Status)
	fmt.Printf("Task error: %s\n", finishedTask.Error)

	return err
}

// ====================================   FOR DEBUG ONLY   ====================================
func (s *MeiliService) Test(id_lang uint) (meilisearch.SearchResponse, error) {
	indexName := "meili_products_shop" + strconv.FormatInt(constdata.SHOP_ID, 10) + "_lang" + strconv.FormatInt(int64(id_lang), 10)

	searchReq := &meilisearch.SearchRequest{
		Limit: 3,
	}

	// Perform search
	results, err := s.meiliClient.Index(indexName).Search("walek", searchReq)
	if err != nil {
		fmt.Printf("Meilisearch error: %v\n", err)
		return meilisearch.SearchResponse{}, err
	}

	fmt.Printf("Search results for query 'walek' in %s: %d hits\n", indexName, len(results.Hits))

	return *results, nil
}

// Search performs a full-text search on the specified index
func (s *MeiliService) Search(indexName string, query string, limit int) (meilisearch.SearchResponse, error) {
	searchReq := &meilisearch.SearchRequest{
		Limit: int64(limit),
	}

	results, err := s.meiliClient.Index(indexName).Search(query, searchReq)
	if err != nil {
		fmt.Printf("Meilisearch search error: %v\n", err)
		return meilisearch.SearchResponse{}, err
	}

	return *results, nil
}

// HealthCheck checks if Meilisearch is healthy and accessible
func (s *MeiliService) HealthCheck() (*meilisearch.Health, error) {
	health, err := s.meiliClient.Health()
	if err != nil {
		return nil, fmt.Errorf("meilisearch health check failed: %w", err)
	}

	return health, nil
}

// remove all tags from HTML text
func cleanHTML(s string) string {
	r := strings.NewReader(s)
	d := xml.NewDecoder(r)

	text := ""

	// Configure the decoder for HTML; leave off strict and autoclose for XHTML
	d.Strict = true
	d.AutoClose = xml.HTMLAutoClose
	d.Entity = xml.HTMLEntity
	for {
		token, err := d.Token()
		if err == io.EOF {
			break
		}

		switch v := token.(type) {
		case xml.StartElement:
			text += "\n"
		case xml.EndElement:
		case xml.CharData:
			text += string(v)
		case xml.Comment:
		case xml.ProcInst:
		case xml.Directive:
		}
	}

	return text
}