package productsRepo

import (
	"encoding/json"
	"fmt"

	"git.ma-al.com/goc_daniel/b2b/app/config"
	"git.ma-al.com/goc_daniel/b2b/app/db"
	"git.ma-al.com/goc_daniel/b2b/app/model"
	"git.ma-al.com/goc_daniel/b2b/app/model/dbmodel"
	"git.ma-al.com/goc_daniel/b2b/app/utils/query/filters"
	"git.ma-al.com/goc_daniel/b2b/app/utils/query/find"
	"git.ma-al.com/goc_marek/gormcol"
	"github.com/WinterYukky/gorm-extra-clause-plugin/exclause"
)

type UIProductsRepo interface {
	GetJSON(p_id_product, p_id_shop, p_id_lang, p_id_customer, b2b_id_country, p_quantity int) (*json.RawMessage, error)
	Find(id_lang, userID uint, p find.Paging, filt *filters.FiltersList) (find.Found[model.ProductInList], error)
}

type ProductsRepo struct{}

func New() UIProductsRepo {
	return &ProductsRepo{}
}

func (repo *ProductsRepo) GetJSON(p_id_product, p_id_shop, p_id_lang, p_id_customer, b2b_id_country, p_quantity int) (*json.RawMessage, error) {
	var productStr string // ← Scan as string first

	err := db.DB.Raw(`CALL get_full_product(?,?,?,?,?,?)`,
		p_id_product, p_id_shop, p_id_lang, p_id_customer, b2b_id_country, p_quantity).
		Scan(&productStr).
		Error

	if err != nil {
		return nil, err
	}

	if !json.Valid([]byte(productStr)) {
		return nil, fmt.Errorf("invalid json returned from stored procedure")
	}

	raw := json.RawMessage(productStr)
	return &raw, nil
}

func (repo *ProductsRepo) Find(id_lang, userID uint, p find.Paging, filt *filters.FiltersList) (find.Found[model.ProductInList], error) {
	var list []model.ProductInList
	var total int64

	query := db.Get().
		Table(gormcol.Field.Tab(dbmodel.PsProductShopCols.Active)+" AS ps").
		Select(`
			ps.id_product AS product_id,
			pl.name AS name,
			pl.link_rewrite AS link_rewrite,
			CONCAT(?, '/', ims.id_image, '-small_default/', pl.link_rewrite, '.webp') AS image_link,
			cl.name AS category_name,
			p.reference AS reference,
			COALESCE(v.variants_number, 0) AS variants_number,
			sa.quantity AS quantity,
			COALESCE(f.is_favorite, 0) AS is_favorite
    	`, config.Get().Image.ImagePrefix).
		Joins("JOIN "+dbmodel.PsProductCols.IDProduct.Tab()+" p ON p.id_product = ps.id_product").
		Joins("JOIN ps_product_lang pl ON pl.id_product = ps.id_product AND pl.id_lang = ?", id_lang).
		Joins("JOIN ps_image_shop ims ON ims.id_product = ps.id_product AND ims.cover = 1").
		Joins("JOIN ps_category_lang cl ON cl.id_category = ps.id_category_default AND cl.id_lang = ?", id_lang).
		Joins("JOIN ps_category_product cp ON cp.id_product = ps.id_product").
		Joins("LEFT JOIN variants v ON v.id_product = ps.id_product").
		Joins("LEFT JOIN favorites f ON f.id_product = ps.id_product").
		Joins("LEFT JOIN ps_stock_available sa ON sa.id_product = ps.id_product AND sa.id_product_attribute = 0").
		Where("ps.active = ?", 1).
		Group("ps.id_product").
		Clauses(exclause.With{
			CTEs: []exclause.CTE{
				{
					Name: "variants",
					Subquery: exclause.Subquery{
						DB: db.Get().
							Model(&dbmodel.PsProductAttributeShop{}).
							Select("id_product", "COUNT(*) AS variants_number").
							Group("id_product"),
					},
				},

				{
					Name: "favorites",
					Subquery: exclause.Subquery{
						DB: db.Get().
							Table("b2b_favorites").
							Select(`
								product_id AS id_product,
								COUNT(*) > 0 AS is_favorite
							`).
							Where("user_id = ?", userID).
							Group("product_id"),
					},
				},
			},
		}).
		Order("ps.id_product DESC")

	// Apply all filters
	if filt != nil {
		filt.ApplyAll(query)
	}

	//  run counter first as query is without limit and offset
	err := query.Count(&total).Error
	if err != nil {
		return find.Found[model.ProductInList]{}, err
	}

	err = query.
		Limit(p.Limit()).
		Offset(p.Offset()).
		Find(&list).Error
	if err != nil {
		return find.Found[model.ProductInList]{}, err
	}

	return find.Found[model.ProductInList]{
		Items: list,
		Count: uint(total),
	}, nil
}