package officialwebsiteser

import (
	"time"

	"91porn-server/common/stderr"
	officialwebsitemod "91porn-server/models/v/officialWebsitemod"

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

// ─────────────────────────────────────────
// Service functions
// ─────────────────────────────────────────

func ListNews(req *NewsListReq) (int64, []officialwebsitemod.News, error) {
	filter, err := req.Query()
	if err != nil {
		return 0, nil, err
	}
	mod := &officialwebsitemod.News{}
	total, err := mod.Count(filter)
	if err != nil {
		return 0, nil, err
	}
	list, err := mod.FindMany(filter, req.FindOptions())
	if err != nil {
		return 0, nil, err
	}
	return total, list, nil
}

// resolveNewsSeoSlug 处理 seoSlug：手填则校验格式并查重(冲突报错)；为空则由标题生成雏形并追加后缀去重。
func resolveNewsSeoSlug(provided, title string, excludeID primitive.ObjectID) (string, error) {
	return ResolveSeoSlug(provided, title, func(slug string) (bool, error) {
		filter := officialwebsitemod.M{"seoSlug": slug}
		if !excludeID.IsZero() {
			filter["_id"] = officialwebsitemod.M{"$ne": excludeID}
		}
		n, err := (&officialwebsitemod.News{}).Count(filter)
		return n > 0, err
	})
}

func CreateNews(req *ModifyNewsReq) (officialwebsitemod.News, error) {
	data := req.toMod()
	// SEO slug：手填优先(校验唯一)，为空则由标题生成雏形并去重
	slug, err := resolveNewsSeoSlug(data.SeoSlug, data.Title, primitive.NilObjectID)
	if err != nil {
		return officialwebsitemod.News{}, err
	}
	data.SeoSlug = slug
	if err := data.Create(); err != nil {
		return officialwebsitemod.News{}, err
	}
	return data, nil
}

func UpdateNews(req *ModifyNewsReq) (resp CountResp, err error) {
	if req == nil || req.ID == "" {
		return
	}
	id, parseErr := primitive.ObjectIDFromHex(req.ID)
	if parseErr != nil || isNilObjectID(id) {
		err = stderr.ErrParamError
		return
	}
	mod := &officialwebsitemod.News{}
	if err = mod.FindOne(officialwebsitemod.M{"_id": id}); err != nil {
		return
	}
	// 若提交了 seoSlug，先校验/去重(排除自身)，回写后由 toM 落库
	if req.SeoSlug != nil {
		var slug string
		if slug, err = resolveNewsSeoSlug(*req.SeoSlug, mod.Title, id); err != nil {
			return
		}
		*req.SeoSlug = slug
	}
	var update officialwebsitemod.M
	if update, err = req.toM(); err != nil || update == nil {
		return
	}
	resp.Count, err = mod.Update(officialwebsitemod.M{"_id": id}, update)
	return
}

func DeleteNews(req *DeleteNewsReq) (data DeleteNewsResp, err error) {
	if req == nil {
		err = stderr.CodeEmptyData
		return
	}
	var id primitive.ObjectID
	if id, err = primitive.ObjectIDFromHex(req.ID); err != nil {
		return
	}
	if isNilObjectID(id) {
		err = stderr.ErrParamError
		return
	}
	mod := &officialwebsitemod.News{}
	data.Count, err = mod.Delete(officialwebsitemod.M{"_id": id})
	return
}

// ─────────────────────────────────────────
// Mutation (Modify) types
// ─────────────────────────────────────────

type ModifyNewsReq struct {
	ID          string                    `json:"id" form:"id"`
	Title       *string                   `json:"title"`
	SeoSlug     *string                   `json:"seoSlug"`
	Description *string                   `json:"description"`
	Cover       *string                   `json:"cover"`
	Url         *string                   `json:"url"`
	Tags        *[]officialwebsitemod.Tag `json:"tags"`
	Detail      *string                   `json:"detail"`
	Sort        *int64                    `json:"sort"`
	IsActive    *bool                     `json:"isActive"`
}

// ─────────────────────────────────────────
// Delete types
// ─────────────────────────────────────────

type DeleteNewsReq struct {
	ID string `json:"id" form:"id"`
}

type DeleteNewsResp struct {
	Count int64 `json:"count"`
}

// ─────────────────────────────────────────
// toMod — ModifyNewsReq → model struct
// ─────────────────────────────────────────

func (req *ModifyNewsReq) toMod() officialwebsitemod.News {
	if req == nil {
		return officialwebsitemod.News{}
	}
	data := officialwebsitemod.News{
		Title:       stringOrZero(req.Title),
		Description: stringOrZero(req.Description),
		Cover:       stringOrZero(req.Cover),
		Url:         stringOrZero(req.Url),
		Detail:      stringOrZero(req.Detail),
		SortModel: officialwebsitemod.SortModel{
			Sort:     int64OrZero(req.Sort),
			IsActive: boolOrZero(req.IsActive),
		},
	}
	if req.Tags != nil {
		data.Tags = *req.Tags
	}
	if req.SeoSlug != nil {
		data.SeoSlug = *req.SeoSlug
	}
	return data
}

// ─────────────────────────────────────────
// toM — ModifyNewsReq → officialwebsitemod.M
// ─────────────────────────────────────────

func (req *ModifyNewsReq) toM() (officialwebsitemod.M, error) {
	if req == nil {
		return nil, stderr.CodeEmptyData
	}
	set := officialwebsitemod.M{}
	if req.Title != nil {
		set["title"] = *req.Title
	}
	if req.SeoSlug != nil && *req.SeoSlug != "" {
		set["seoSlug"] = *req.SeoSlug
	}
	if req.Description != nil {
		set["description"] = *req.Description
	}
	if req.Cover != nil {
		set["cover"] = *req.Cover
	}
	if req.Url != nil {
		set["url"] = *req.Url
	}
	if req.Tags != nil {
		set["tags"] = *req.Tags
	}
	if req.Detail != nil {
		set["detail"] = *req.Detail
	}
	if req.Sort != nil {
		set["sort"] = *req.Sort
	}
	if req.IsActive != nil {
		set["isActive"] = *req.IsActive
	}
	if len(set) == 0 {
		return nil, nil
	}
	set["updatedAt"] = time.Now().UTC()
	return officialwebsitemod.M{"$set": set}, nil
}

// ─────────────────────────────────────────
// List types
// ─────────────────────────────────────────

type NewsListReq struct {
	PageReq
	ID          *string    `form:"id"`
	Title       *string    `form:"title"`
	Description *string    `form:"description"`
	Cover       *string    `form:"cover"`
	Url         *string    `form:"url"`
	Tags        *string    `form:"tags"`
	Sort        *int64     `form:"sort"`
	IsActive    *bool      `form:"isActive"`
	CreatedAt   *time.Time `form:"createdAt"`
	UpdatedAt   *time.Time `form:"updatedAt"`
	DeletedAt   *time.Time `form:"deletedAt"`
}

func (r *NewsListReq) Query() (officialwebsitemod.M, error) {
	filter := officialwebsitemod.M{}
	if err := parseObjectIDFilter(filter, "_id", r.ID); err != nil {
		return nil, err
	}
	if r.Title != nil {
		filter["title"] = *r.Title
	}
	if r.Description != nil {
		filter["description"] = *r.Description
	}
	if r.Cover != nil {
		filter["cover"] = *r.Cover
	}
	if r.Url != nil {
		filter["url"] = *r.Url
	}
	if err := parseJSONFilter(filter, "tags", r.Tags, &[]officialwebsitemod.Tag{}); err != nil {
		return nil, err
	}
	if r.Sort != nil {
		filter["sort"] = *r.Sort
	}
	if r.IsActive != nil {
		filter["isActive"] = *r.IsActive
	}
	if r.CreatedAt != nil {
		filter["createdAt"] = *r.CreatedAt
	}
	if r.UpdatedAt != nil {
		filter["updatedAt"] = *r.UpdatedAt
	}
	if r.DeletedAt != nil {
		filter["deletedAt"] = *r.DeletedAt
	}
	return filter, nil
}