package playletser

import (
	"fmt"
	"net/url"
	"strconv"
	"strings"
	"videoweb/app/service/upstream"
	"videoweb/pub/common/log"

	"github.com/gin-gonic/gin"
)

const (
	recommendListPath    = "/api/app/playlet/list"
	defaultRecommendSize = 25
)

// RecommendQuery 专题详情分页参数。
type RecommendQuery struct {
	PageNum   int
	PageSize  int
	SortOrder int
	ThemeID   int64
	ThemeSlug string
}

// Normalize 校正分页默认值。
func (q *RecommendQuery) Normalize() {
	if q.PageNum <= 0 {
		q.PageNum = 1
	}
	if q.PageSize <= 0 {
		q.PageSize = defaultRecommendSize
	}
	if q.PageSize > 100 {
		q.PageSize = 100
	}
	if q.SortOrder != sortTodayUpdate {
		q.SortOrder = sortHeat
	}
}

func recommendListURL(q RecommendQuery) string {
	q.Normalize()
	params := url.Values{}
	params.Set("pageNum", strconv.Itoa(q.PageNum))
	params.Set("pageSize", strconv.Itoa(q.PageSize))
	params.Set("sortOrder", strconv.Itoa(q.SortOrder))
	if slug := strings.TrimSpace(q.ThemeSlug); slug != "" {
		params.Set("themeSlug", slug)
	} else if q.ThemeID > 0 {
		params.Set("themeId", strconv.FormatInt(q.ThemeID, 10))
	}
	return recommendListPath + "?" + params.Encode()
}

// FetchRecommendList 按 Swagger 的题材 ID 或 slug 参数分页查询专题短剧。
func FetchRecommendList(c *gin.Context, q RecommendQuery) (*PlayletVideoResp, error) {
	var env APIEnvelope[PlayletVideoResp]
	if err := upstream.GetPublicJSON(c, recommendListURL(q), &env); err != nil {
		return nil, err
	}
	if env.Code != 200 {
		return nil, fmt.Errorf("playlet recommend list code=%d msg=%s", env.Code, env.Msg)
	}
	return &env.Data, nil
}

// FetchRecommendListOrEmpty 失败时返回空列表。
func FetchRecommendListOrEmpty(c *gin.Context, q RecommendQuery) *PlayletVideoResp {
	q.Normalize()
	data, err := FetchRecommendList(c, q)
	if err != nil {
		log.Error("fetch playlet recommend list failed", log.E(err))
		return &PlayletVideoResp{PageNum: q.PageNum, PageSize: q.PageSize}
	}
	if data == nil {
		return &PlayletVideoResp{PageNum: q.PageNum, PageSize: q.PageSize}
	}
	data.SeoInfo.Normalize()
	return data
}