package entity

import (
	"fmt"
	"strconv"
	"strings"
	"time"
	"unicode"
)

type GoodsItem struct {
	Articul     string            `json:"sku"`
	PhotoURLs   []string          `json:"photo"`
	Name        string            `json:"name"`
	Description string            `json:"description"`
	Category    string            `json:"category"`
	Type        string            `json:"type"`
	Producer    string            `json:"producer"`
	Pack        int               `json:"pack"`
	Step        int               `json:"step"`
	Price       float64           `json:"price"`
	TariffPrice float64           `json:"tariff_price"`
	Cart        int64             `json:"cart"`
	Stock       int               `json:"stock"`
	Parameters  map[string]string `json:"parameters"`
	CreatedAt   time.Time         `json:"created_at"`
}

type GoodsItemRaw struct {
	SKU           string // or articul
	Photo         string
	Certificate   string
	Configurator  []string
	Name          []string // first element is name, second is description
	Category      string
	Type          string
	Producer      string
	Storage       string // ?
	Pack          string // like "20 шт."
	Step          string
	Price         string // float actually
	TariffPrice   string // float
	SpecialOffers []any
	Cart          float64
	Other         string
}

type GoodsItemInfo struct {
	Parameters map[string]string
	PhotoURLs  []string
}

type MappedGoodsRemnants map[int]GoodsRemnant
type GoodsRemnant [4]int32

func MakeGoodsItem(
	gi GoodsItemRaw,
	remnants MappedGoodsRemnants,
	info GoodsItemInfo,
) (out GoodsItem, err error) {
	var name, desc string
	var pack, step int
	var price, tariffPrice float64

	if len(gi.Name) >= 2 {
		name = gi.Name[0]
		desc = gi.Name[1]
	}

	fixSpace := func(in string) string {
		return strings.ReplaceAll(in, " ", "")
	}

	price, err = strconv.ParseFloat(fixSpace(gi.Price), 64)
	if err != nil {
		return out, fmt.Errorf("parsing price: %w", err)
	}
	tariffPrice, err = strconv.ParseFloat(fixSpace(gi.TariffPrice), 64)
	if err != nil {
		return out, fmt.Errorf("parsing tariff_price: %w", err)
	}

	getDigits := func(in string) string {
		var sb strings.Builder
		sb.Grow(len(in))
		for _, c := range in {
			if unicode.IsDigit(c) {
				sb.WriteRune(c)
				continue
			}
			break
		}

		return sb.String()
	}

	const countTemplate = "%d"
	_, err = fmt.Sscanf(getDigits(gi.Pack), countTemplate, &pack)
	if err != nil {
		return out, fmt.Errorf("getting pack count (%s): %w", gi.Pack, err)
	}
	_, err = fmt.Sscanf(getDigits(gi.Step), countTemplate, &step)
	if err != nil {
		return out, fmt.Errorf("getting step count (%s): %w", gi.Step, err)
	}

	photoURLs := info.PhotoURLs
	if len(photoURLs) > 7 {
		photoURLs = info.PhotoURLs[:7]
	}

	return GoodsItem{
		Articul:     gi.SKU,
		Name:        name,
		Description: desc,
		Category:    gi.Category,
		Type:        gi.Type,
		Producer:    gi.Producer,
		Pack:        pack,
		Step:        step,
		Price:       price,
		TariffPrice: tariffPrice,
		Cart:        int64(gi.Cart),
		Stock:       int(remnants[int(gi.Cart)][0]),
		PhotoURLs:   photoURLs,
		Parameters:  info.Parameters,
	}, nil
}