package playletser

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

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

const (
	searchPath            = "/api/app/playlet/search"
	defaultSearchPageSize = 25
)

// SearchQuery 搜索分页参数（keyword 对应上游 query）。
type SearchQuery struct {
	Keyword  string
	PageNum  int
	PageSize int
}

// Normalize 校正分页默认值。
func (q *SearchQuery) Normalize() {
	q.Keyword = strings.TrimSpace(q.Keyword)
	if q.PageNum <= 0 {
		q.PageNum = 1
	}
	if q.PageSize <= 0 {
		q.PageSize = defaultSearchPageSize
	}
	if q.PageSize > 50 {
		q.PageSize = 50
	}
}

// FetchSearch ES 分页搜索短剧。
func FetchSearch(c *gin.Context, q SearchQuery) (*PlayletVideoResp, error) {
	q.Normalize()
	if q.Keyword == "" {
		return nil, fmt.Errorf("playlet search keyword is empty")
	}
	authser.EnsureGuestOnEnter(c)
	env, err := fetchSearchOnce(c, q)
	if err != nil {
		return nil, err
	}
	if env.Code != 200 && authser.IsSessionExpiredCode(env.Code) {
		if authser.RecoverContentSession(c, env.Code) {
			env, err = fetchSearchOnce(c, q)
			if err != nil {
				return nil, err
			}
		}
	}
	if env.Code != 200 {
		return nil, fmt.Errorf("playlet search code=%d msg=%s tip=%s", env.Code, env.Msg, env.Tip)
	}
	return &env.Data, nil
}

func fetchSearchOnce(c *gin.Context, q SearchQuery) (*APIEnvelope[PlayletVideoResp], error) {
	params := url.Values{}
	params.Set("pageNum", strconv.Itoa(q.PageNum))
	params.Set("pageSize", strconv.Itoa(q.PageSize))
	params.Set("keyword", q.Keyword)
	var env APIEnvelope[PlayletVideoResp]
	if err := upstream.GetJSON(c, searchPath+"?"+params.Encode(), &env); err != nil {
		return nil, err
	}
	return &env, nil
}

// FetchSearchOrEmpty 失败时返回空列表。
func FetchSearchOrEmpty(c *gin.Context, q SearchQuery) *PlayletVideoResp {
	data, err := FetchSearch(c, q)
	if err != nil {
		log.Error("fetch playlet search failed", log.E(err))
		return &PlayletVideoResp{PageNum: q.PageNum, PageSize: q.PageSize}
	}
	if data == nil {
		return &PlayletVideoResp{PageNum: q.PageNum, PageSize: q.PageSize}
	}
	return data
}

func searchPageURL(keyword string, pageNum int) string {
	keyword = strings.TrimSpace(keyword)
	if keyword == "" {
		return "/search/"
	}
	path := "/search/" + url.PathEscape(keyword)
	if pageNum > 1 {
		path += "/page/" + strconv.Itoa(pageNum)
	}
	return path + "/"
}

func SearchCanonicalPath(q SearchQuery) string {
	q.Normalize()
	return searchPageURL(q.Keyword, q.PageNum)
}

// BuildSearchPagination 搜索分页。
func BuildSearchPagination(q SearchQuery, totalCount int64) PaginationVM {
	q.Normalize()
	return BuildPagination(func(p int) string {
		return searchPageURL(q.Keyword, p)
	}, q.PageNum, q.PageSize, totalCount)
}

// ParseSearchQuery 从站点 query 解析（q → keyword）。
func ParseSearchQuery(qStr, pageStr string) SearchQuery {
	q := SearchQuery{PageSize: defaultSearchPageSize, Keyword: strings.TrimSpace(qStr)}
	if n, err := strconv.Atoi(strings.TrimSpace(pageStr)); err == nil {
		q.PageNum = n
	}
	q.Normalize()
	return q
}