package logic

import (
	"context"
	"strings"

	"easygoadmin/api/v1"
	"easygoadmin/internal/consts"
	"easygoadmin/internal/dao"
	"easygoadmin/internal/service"
)

// ============================== 文章业务实现 ==============================

// sArticle 文章业务实现
// 实现 service.IArticle 接口，承载文章模块的业务逻辑
type sArticle struct{}

// articleSerializeMaps 枚举字段到字典编码的映射
// {field}Text 由 dict_item 解析，字典管理页可修改文案
var articleSerializeMaps = map[string]string{
	"status": "article_status",
}

// articleSpec 文章模块声明
//
// Status 特有方法与文件字段保存在 Add/Update 手写体内处理；
// 文件与富文本读侧还原由基座 readTransform 按下列声明自动完成
var articleSpec = ModuleSpec[v1.ArticleItem, v1.ArticleListItem, v1.ArticleDetailRes]{
	Model:           dao.Article.Ctx,
	LikeFields:      []string{"title", "author"},
	EqFields:        []string{"status", "category_id"}, // 零值不筛（列表初始显示全部）
	OrderBy:         "sort, id DESC",
	ListOrderBy:     "sort, id",
	SerializeMaps:   articleSerializeMaps,
	FileFields:      []string{"cover"},   // 读侧补域名
	MultiFileFields: []string{"images"},  // 逗号多图：读侧逐个补域名
	ContentFields:   []string{"content"}, // 富文本：读侧 [IMG_URL] 还原
	FileSaveDir:     "article",
	AfterPageList:   articleExpandCategory,  // 行内分类名批量补全
	AfterDetail:     articleSplitImagesList, // 多图拆分为 imagesList 数组
}

// articleExpandCategory 分页行分类名批量补全
// 将分类ID映射为分类名称，避免逐行查询
func articleExpandCategory(ctx context.Context, list []*v1.ArticleItem, req any) error {
	catNames := (&sArticle{}).categoryNames(ctx)
	for _, item := range list {
		item.CategoryName = catNames[int64(item.CategoryId)]
	}
	return nil
}

func init() {
	service.RegisterArticle(&sArticle{})
}

// Page 文章分页
// 按查询条件分页返回文章列表
func (s *sArticle) Page(ctx context.Context, req *v1.ArticlePageReq) (res *v1.ArticlePageRes, err error) {
	list, total, err := articleSpec.Page(ctx, req, req.GetPageNo(), req.GetPageSize())
	if err != nil {
		return nil, err
	}
	return v1.NewPageData(req.GetPageNo(), req.GetPageSize(), total, derefSlice(list)), nil
}

// List 文章全量列表
// 按查询条件返回文章精简列表
func (s *sArticle) List(ctx context.Context, req *v1.ArticleListReq) (res v1.ArticleListRes, err error) {
	list, err := articleSpec.List(ctx, req)
	if err != nil {
		return nil, err
	}
	return derefSlice(list), nil
}

// Detail 文章详情
// 按文章ID查询详情
func (s *sArticle) Detail(ctx context.Context, req *v1.ArticleDetailReq) (res *v1.ArticleDetailRes, err error) {
	return articleSpec.Detail(ctx, req.Id, req)
}

// articleSplitImagesList 详情装配
// 将多图逗号串（读转换已补域名）拆分为 imagesList 数组
func articleSplitImagesList(ctx context.Context, item *v1.ArticleDetailRes, req any) error {
	if item.Images == "" {
		return nil
	}
	for _, u := range strings.Split(item.Images, ",") {
		if u = strings.TrimSpace(u); u != "" {
			item.ImagesList = append(item.ImagesList, u)
		}
	}
	return nil
}

// Add 新增文章
// 封面与多图由临时目录迁移至正式目录，正文富文本本地化后落库
func (s *sArticle) Add(ctx context.Context, req *v1.ArticleAddReq) (res *v1.IdRes, err error) {
	// 封面/多图 temp → 正式目录；正文富文本本地化（[IMG_URL] 占位符契约）
	req.Cover = SaveFileField(ctx, req.Cover, "article")
	req.Images = SaveMultiFileField(ctx, req.Images, "article")
	req.Content = LocalizeContentFields(ctx, req.Content, "article")
	result, err := dao.Article.Ctx(ctx).Data(map[string]any{
		"category_id": req.CategoryId,
		"title":       req.Title,
		"cover":       req.Cover,
		"images":      req.Images,
		"intro":       req.Intro,
		"content":     req.Content,
		"author":      req.Author,
		"status":      req.Status,
		"sort":        req.Sort,
		"tenant_id":   consts.GetTenantID(ctx),
	}).Insert()
	if err != nil {
		return nil, err
	}
	idv, _ := result.LastInsertId()
	return &v1.IdRes{Id: idv}, nil
}

// Update 修改文章
// 封面与多图由临时目录迁移至正式目录，正文富文本本地化后更新
func (s *sArticle) Update(ctx context.Context, req *v1.ArticleUpdateReq) (res *v1.ArticleUpdateRes, err error) {
	req.Cover = SaveFileField(ctx, req.Cover, "article")
	req.Images = SaveMultiFileField(ctx, req.Images, "article")
	req.Content = LocalizeContentFields(ctx, req.Content, "article")
	if _, err = dao.Article.Ctx(ctx).Where("id", req.Id).Data(map[string]any{
		"category_id": req.CategoryId,
		"title":       req.Title,
		"cover":       req.Cover,
		"images":      req.Images,
		"intro":       req.Intro,
		"content":     req.Content,
		"author":      req.Author,
		"status":      req.Status,
		"click":       req.Click,
		"sort":        req.Sort,
	}).Update(); err != nil {
		return nil, err
	}
	return &v1.ArticleUpdateRes{}, nil
}

// Status 文章状态
// 设置文章的草稿或发布状态
func (s *sArticle) Status(ctx context.Context, req *v1.ArticleStatusReq) (res *v1.ArticleStatusRes, err error) {
	if _, err = dao.Article.Ctx(ctx).Where("id", req.Id).Data(map[string]any{"status": req.Status}).Update(); err != nil {
		return nil, err
	}
	return &v1.ArticleStatusRes{}, nil
}

// Delete 删除文章
// 按文章ID删除单条记录
func (s *sArticle) Delete(ctx context.Context, req *v1.ArticleDeleteReq) (res *v1.ArticleDeleteRes, err error) {
	if err = articleSpec.Delete(ctx, req.Id); err != nil {
		return nil, err
	}
	return &v1.ArticleDeleteRes{}, nil
}

// BatchDelete 批量删除文章
// 按文章ID列表批量删除记录
func (s *sArticle) BatchDelete(ctx context.Context, req *v1.ArticleBatchDeleteReq) (res *v1.ArticleBatchDeleteRes, err error) {
	if err = articleSpec.BatchDelete(ctx, req.Ids); err != nil {
		return nil, err
	}
	return &v1.ArticleBatchDeleteRes{}, nil
}

// categoryNames 查询分类ID到名称的映射
func (s *sArticle) categoryNames(ctx context.Context) map[int64]string {
	result := make(map[int64]string)
	rows, err := dao.Category.Ctx(ctx).Fields("id, category_name").All()
	if err != nil {
		return result
	}
	for _, r := range rows {
		result[r["id"].Int64()] = r["category_name"].String()
	}
	return result
}