package playletser

import (
	"strconv"
	"strings"
)

func recommendPageURL(themeID int64, themeSlug string, pageNum int) string {
	if pageNum <= 0 {
		pageNum = 1
	}
	path := "/topic"
	if segment := pathSegment(themeSlug, themeID); segment != "" {
		path += "/" + segment
	}
	if pageNum > 1 {
		path += "/page/" + strconv.Itoa(pageNum)
	}
	return path + "/"
}

func RecommendPagePath(q RecommendQuery) string {
	q.Normalize()
	return recommendPageURL(q.ThemeID, q.ThemeSlug, q.PageNum)
}

// RecommendThemeTitle 专题页标题：优先题材名称，其次使用列表接口 SEO 标题。
func RecommendThemeTitle(name, seoTitle string, themeID int64) string {
	name = strings.TrimSpace(name)
	if name != "" {
		return name
	}
	seoTitle = strings.TrimSpace(seoTitle)
	if seoTitle != "" {
		return seoTitle
	}
	if themeID > 0 {
		return "专题短剧"
	}
	return "专题推荐"
}

// RecommendCanonicalPath 推荐页 canonical（不含 page）。
func RecommendCanonicalPath(themeID int64, themeSlug string) string {
	return recommendPageURL(themeID, themeSlug, 1)
}

// BuildRecommendPagination 推荐列表分页。
func BuildRecommendPagination(q RecommendQuery, totalCount int64) PaginationVM {
	q.Normalize()
	return BuildPagination(func(p int) string {
		return recommendPageURL(q.ThemeID, q.ThemeSlug, p)
	}, q.PageNum, q.PageSize, totalCount)
}

// ParseRecommendQuery 从路由解析分页。
func ParseRecommendQuery(pageStr string) RecommendQuery {
	q := RecommendQuery{PageSize: defaultRecommendSize, SortOrder: sortHeat}
	if n, err := strconv.Atoi(strings.TrimSpace(pageStr)); err == nil {
		q.PageNum = n
	}
	q.Normalize()
	return q
}