package srv_homeconfig

import (
	"context"
	"hkdj-web-server/pub/common/srvdef"
	"hkdj-web-server/pub/common/utils"
	"hkdj-web-server/pub/models/homeconfigmod"
	"hkdj-web-server/web/api/proto"
	"strings"

	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo/options"
)

func ensureHomeConfigSlug(ctx context.Context, ac *homeconfigmod.HomeConfig, excludeId int64) *srvdef.SrvErr {
	ac.Slug = utils.SanitizeSlug(ac.Slug)
	if ac.Slug != "" {
		if utils.IsSlugAllDigits(ac.Slug) {
			return srvdef.New(srvdef.ErrParamError, "Slug不能全是数字", "Slug不能全是数字")
		}
		filter := bson.M{homeconfigmod.FN.HomeConfig.Slug: ac.Slug}
		if excludeId > 0 {
			filter[homeconfigmod.FN.HomeConfig.Id] = bson.M{"$ne": excludeId}
		}
		exist, _ := homeconfigmod.FindOneHomeConfig(ctx, filter)
		if exist != nil {
			return srvdef.New(srvdef.ErrDbInputExist, "Slug已存在", "Slug已存在")
		}
		return nil
	}
	source := utils.SlugSourceFromKeywordsOrTitle(ac.SeoInfo.Keyworld, ac.Name)
	ac.Slug = utils.MakeUniqueSlug(source, func(slug string) bool {
		filter := bson.M{homeconfigmod.FN.HomeConfig.Slug: slug}
		if excludeId > 0 {
			filter[homeconfigmod.FN.HomeConfig.Id] = bson.M{"$ne": excludeId}
		}
		exist, _ := homeconfigmod.FindOneHomeConfig(ctx, filter)
		return exist != nil
	})
	return nil
}

func prepareHomeConfigSlugOnUpdate(ctx context.Context, id int64, info *homeconfigmod.HomeConfig, req *proto.HomeConfigUpdateReq, setDoc bson.M) *srvdef.SrvErr {
	slug := info.Slug
	if req.Slug != nil {
		slug = utils.SanitizeSlug(*req.Slug)
	}
	if slug != "" {
		if req.Slug != nil {
			if utils.IsSlugAllDigits(slug) {
				return srvdef.New(srvdef.ErrParamError, "Slug不能全是数字", "Slug不能全是数字")
			}
			exist, _ := homeconfigmod.FindOneHomeConfig(ctx, bson.M{
				homeconfigmod.FN.HomeConfig.Slug: slug,
				homeconfigmod.FN.HomeConfig.Id:   bson.M{"$ne": id},
			})
			if exist != nil {
				return srvdef.New(srvdef.ErrDbInputExist, "Slug已存在", "Slug已存在")
			}
			setDoc[homeconfigmod.FN.HomeConfig.Slug] = slug
		}
		return nil
	}
	name := info.Name
	if req.Name != nil {
		name = strings.TrimSpace(*req.Name)
	}
	keywords := info.SeoInfo.Keyworld
	if req.SeoInfo != nil {
		keywords = normalizeHomeConfigSeoValue(*req.SeoInfo).Keyworld
	}
	source := utils.SlugSourceFromKeywordsOrTitle(keywords, name)
	setDoc[homeconfigmod.FN.HomeConfig.Slug] = utils.MakeUniqueSlug(source, func(s string) bool {
		exist, _ := homeconfigmod.FindOneHomeConfig(ctx, bson.M{
			homeconfigmod.FN.HomeConfig.Slug: s,
			homeconfigmod.FN.HomeConfig.Id:   bson.M{"$ne": id},
		})
		return exist != nil
	})
	return nil
}

func emptyHomeConfigSlugFilter() bson.M {
	return bson.M{
		"$or": []bson.M{
			{homeconfigmod.FN.HomeConfig.Slug: ""},
			{homeconfigmod.FN.HomeConfig.Slug: bson.M{"$exists": false}},
		},
	}
}

// SyncEmptySlugs 为首页配置中空 slug 自动生成。
func SyncEmptySlugs(ctx context.Context, maxSize int64) (int64, bool, *srvdef.SrvErr) {
	if maxSize <= 0 {
		return 0, false, nil
	}
	list, err := homeconfigmod.FindManyHomeConfig(ctx, emptyHomeConfigSlugFilter(), options.Find().
		SetSort(bson.D{{Key: homeconfigmod.FN.HomeConfig.Id, Value: 1}}).
		SetLimit(maxSize+1))
	if err != nil {
		return 0, false, err
	}
	hasMore := int64(len(list)) > maxSize
	if hasMore {
		list = list[:maxSize]
	}
	var updated int64
	for _, item := range list {
		if item == nil {
			continue
		}
		if serr := ensureHomeConfigSlug(ctx, item, item.Id); serr != nil {
			return updated, hasMore, serr
		}
		if strings.TrimSpace(item.Slug) == "" {
			continue
		}
		if serr := homeconfigmod.UpdateOneHomeConfig(ctx,
			bson.M{homeconfigmod.FN.HomeConfig.Id: item.Id},
			bson.M{"$set": bson.M{homeconfigmod.FN.HomeConfig.Slug: item.Slug}},
		); serr != nil {
			return updated, hasMore, serr
		}
		updated++
	}
	return updated, hasMore, nil
}

func HasEmptySlug(ctx context.Context) bool {
	count, _ := homeconfigmod.CountHomeConfig(ctx, emptyHomeConfigSlugFilter())
	return count > 0
}