package models

import (
	"strings"
	"time"
	"unicode"
)

type Category struct {
	ID          int64     `json:"id"`
	SiteID      int64     `json:"site_id"`
	GUID        string    `json:"guid"`
	Name        string    `json:"name"`
	Slug        string    `json:"slug"`
	Description string    `json:"description"`
	CreatedAt   time.Time `json:"created_at"`
	UpdatedAt   time.Time `json:"updated_at"`
}

// CategoryWithCount is a Category plus the count of published posts in it.
type CategoryWithCount struct {
	Category
	PostCount        int
	DescriptionBrief string
}

// GenerateCategorySlug creates a URL-safe slug from a category name.
// e.g. "Go Programming" -> "go-programming"
func GenerateCategorySlug(name string) string {
	var sb strings.Builder
	prevDash := false
	for _, c := range strings.TrimSpace(name) {
		if unicode.IsLetter(c) || unicode.IsNumber(c) {
			sb.WriteRune(unicode.ToLower(c))
			prevDash = false
		} else if unicode.IsSpace(c) || c == '-' || c == '_' {
			if !prevDash && sb.Len() > 0 {
				sb.WriteRune('-')
				prevDash = true
			}
		}
	}
	result := sb.String()
	return strings.TrimRight(result, "-")
}

// BriefDescription returns the first sentence or line of the description.
func BriefDescription(desc string) string {
	if desc == "" {
		return ""
	}
	for i, c := range desc {
		if c == '\n' {
			return desc[:i]
		}
		if c == '.' && i+1 < len(desc) {
			return desc[:i+1]
		}
	}
	return desc
}