package logic

import (
	"context"
	"errors"
	"strings"
	"unicode"

	"muyu-apiserver/model"

	"github.com/mozillazg/go-pinyin"
)

const (
	defaultProductColor = "本色"
	defaultYarnColor    = "原纱本色"
	defaultDyeFactory   = "无"
	defaultProcess      = "无"
)

func normalizeColorNo(colorNo string) string {
	return strings.ToUpper(strings.TrimSpace(colorNo))
}

func normalizeProductColor(color string) string {
	color = strings.TrimSpace(color)
	if color == "" {
		return defaultProductColor
	}
	return color
}

func normalizeYarnColor(color string) string {
	color = strings.TrimSpace(color)
	if color == "" {
		return defaultYarnColor
	}
	return color
}

func normalizeDyeFactory(factory string) string {
	factory = strings.TrimSpace(factory)
	if factory == "" {
		return defaultDyeFactory
	}
	return factory
}

func productNameCodePrefix(productName string) string {
	args := pinyin.NewArgs()
	args.Style = pinyin.Normal
	var b strings.Builder

	for _, r := range productName {
		switch {
		case r >= 'a' && r <= 'z':
			b.WriteRune(unicode.ToUpper(r))
		case r >= 'A' && r <= 'Z':
			b.WriteRune(r)
		case r >= '0' && r <= '9':
			b.WriteRune(r)
		case unicode.Is(unicode.Han, r):
			py := pinyin.Pinyin(string(r), args)
			if len(py) > 0 && len(py[0]) > 0 && py[0][0] != "" {
				first := []rune(py[0][0])
				if len(first) > 0 {
					b.WriteRune(unicode.ToUpper(first[0]))
				}
			}
		}
	}

	code := b.String()
	if code == "" {
		return "P"
	}
	return code
}

func generateProductCode(productName, colorNo string) string {
	return productNameCodePrefix(productName) + normalizeColorNo(colorNo)
}

func resolveColorNo(ctx context.Context, productModel model.InvProductModel, tenantId, productName, colorNo string) (string, error) {
	colorNo = normalizeColorNo(colorNo)
	if colorNo != "" {
		return colorNo, nil
	}
	return productModel.NextColorNo(ctx, tenantId, productName)
}

func ensureProductCodeAvailable(ctx context.Context, productModel model.InvProductModel, tenantId, productCode string) error {
	_, err := productModel.FindOneByTenantProductCode(ctx, tenantId, productCode)
	if err == nil {
		return errors.New("产品码已存在")
	}
	if errors.Is(err, model.ErrNotFound) {
		return nil
	}
	return err
}