package playletser

import (
	"strconv"
	"strings"
)

const (
	seriesOperateType  = 2
	seriesPageSize     = 25
	seriesFilterLatest = 1
	seriesFilterHot    = 2
	seriesFilterOrigin = 3
)

var seriesFilters = []struct {
	Type  int
	Slug  string
	Label string
}{
	{Type: seriesFilterLatest, Slug: "latest", Label: "最新更新"},
	{Type: seriesFilterHot, Slug: "popular", Label: "当前热播"},
	{Type: seriesFilterOrigin, Slug: "original", Label: "独家原创"},
}

// ParseSeriesQuery 将语义化筛选路由转换为 Swagger 的 operateType/filterType 参数。
func ParseSeriesQuery(filterSlug, pageStr string) (OperateListQuery, bool) {
	filterType, ok := seriesFilterType(filterSlug)
	if !ok {
		return OperateListQuery{}, false
	}
	q := OperateListQuery{
		OperateType: seriesOperateType,
		FilterType:  filterType,
		PageSize:    seriesPageSize,
	}
	if page, err := strconv.Atoi(strings.TrimSpace(pageStr)); err == nil {
		q.PageNum = page
	}
	q.Normalize()
	return q, true
}

func seriesFilterType(slug string) (int, bool) {
	slug = strings.TrimSpace(slug)
	if slug == "" || slug == "latest" {
		return seriesFilterLatest, true
	}
	for _, filter := range seriesFilters {
		if filter.Slug == slug {
			return filter.Type, true
		}
	}
	return 0, false
}

func seriesFilterSlug(filterType int) string {
	for _, filter := range seriesFilters {
		if filter.Type == filterType {
			return filter.Slug
		}
	}
	return "latest"
}

func seriesPageURL(filterType, pageNum int) string {
	if pageNum <= 0 {
		pageNum = 1
	}
	path := "/series"
	if filterType != seriesFilterLatest {
		path += "/" + seriesFilterSlug(filterType)
	}
	if pageNum > 1 {
		path += "/page/" + strconv.Itoa(pageNum)
	}
	return path + "/"
}

// SeriesCanonicalPath 返回 AI 成人剧集页唯一规范路径。
func SeriesCanonicalPath(q OperateListQuery) string {
	q.Normalize()
	return seriesPageURL(q.FilterType, q.PageNum)
}

// BuildSeriesFilterTabs 构建 Figma 中的三个运营筛选项。
func BuildSeriesFilterTabs(q OperateListQuery) []FilterChipVM {
	q.Normalize()
	out := make([]FilterChipVM, 0, len(seriesFilters))
	for _, filter := range seriesFilters {
		out = append(out, FilterChipVM{
			Label:  filter.Label,
			URL:    seriesPageURL(filter.Type, 1),
			Active: q.FilterType == filter.Type,
		})
	}
	return out
}

func SeriesSectionTitle(filterType int) string {
	for _, filter := range seriesFilters {
		if filter.Type == filterType {
			return filter.Label + "的AI成人剧集"
		}
	}
	return "最新更新的AI成人剧集"
}

func BuildSeriesPagination(q OperateListQuery, totalCount int64) PaginationVM {
	q.Normalize()
	return BuildPagination(func(page int) string {
		return seriesPageURL(q.FilterType, page)
	}, q.PageNum, q.PageSize, totalCount)
}

// SeriesPathFromLegacyList 将原 /list/ai-series 排序地址映射到新页面。
func SeriesPathFromLegacyList(sortOrder, pageNum int) string {
	filterType := seriesFilterLatest
	if sortOrder == sortHeat {
		filterType = seriesFilterHot
	}
	return seriesPageURL(filterType, pageNum)
}