package logic

import (
	"context"

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

// ============================== 字典项业务实现 ==============================

// sDictItem 字典项业务实现
// 实现 service.IDictItem 接口，承载字典项模块的业务逻辑
type sDictItem struct{}

// dictItemSpec 字典项模块声明
// 无标准 List 方法
var dictItemSpec = ModuleSpec[v1.DictItemItemRow, v1.DictItemItemRow, v1.DictItemDetailRes]{
	Model:         dao.DictItem.Ctx,
	LikeFields:    []string{"name", "value"},
	EqFields:      []string{"dict_id"},
	OrderBy:       "sort, id",
	AfterPageList: dictItemExpandName, // 行内字典名/编码批量补全
}

// dictItemExpandName 分页行所属字典名与编码批量补全
// 将字典ID映射为字典名称与编码，避免逐行查询
func dictItemExpandName(ctx context.Context, list []*v1.DictItemItemRow, req any) error {
	info, err := (&sDictItem{}).dictInfoMap(ctx)
	if err != nil {
		return err
	}
	for _, item := range list {
		item.DictName = info[item.DictId].name
		item.DictCode = info[item.DictId].code
	}
	return nil
}

func init() {
	service.RegisterDictItem(&sDictItem{})
}

// Page 字典项分页
// 按查询条件分页返回字典项列表
func (s *sDictItem) Page(ctx context.Context, req *v1.DictItemPageReq) (res *v1.DictItemPageRes, err error) {
	list, total, err := dictItemSpec.Page(ctx, req, req.GetPageNo(), req.GetPageSize())
	if err != nil {
		return nil, err
	}
	return v1.NewPageData(req.GetPageNo(), req.GetPageSize(), total, derefSlice(list)), nil
}

// Detail 字典项详情
// 按字典项ID查询详情
func (s *sDictItem) Detail(ctx context.Context, req *v1.DictItemDetailReq) (res *v1.DictItemDetailRes, err error) {
	return dictItemSpec.Detail(ctx, req.Id, req)
}

// Add 新增字典项
// 新增成功后返回新记录ID
func (s *sDictItem) Add(ctx context.Context, req *v1.DictItemAddReq) (res *v1.IdRes, err error) {
	result, err := dao.DictItem.Ctx(ctx).Data(map[string]any{
		"dict_id": req.DictId,
		"name":    req.Name,
		"value":   req.Value,
		"sort":    req.Sort,
		"note":    req.Note,
	}).Insert()
	if err != nil {
		return nil, err
	}
	idv, _ := result.LastInsertId()
	return &v1.IdRes{Id: idv}, nil
}

// Update 修改字典项
// 按字典项ID更新记录
func (s *sDictItem) Update(ctx context.Context, req *v1.DictItemUpdateReq) (res *v1.DictItemUpdateRes, err error) {
	if _, err = dao.DictItem.Ctx(ctx).Where("id", req.Id).Data(map[string]any{
		"dict_id": req.DictId,
		"name":    req.Name,
		"value":   req.Value,
		"sort":    req.Sort,
		"note":    req.Note,
	}).Update(); err != nil {
		return nil, err
	}
	return &v1.DictItemUpdateRes{}, nil
}

// Delete 删除字典项
// 按字典项ID删除单条记录
func (s *sDictItem) Delete(ctx context.Context, req *v1.DictItemDeleteReq) (res *v1.DictItemDeleteRes, err error) {
	if err = dictItemSpec.Delete(ctx, req.Id); err != nil {
		return nil, err
	}
	return &v1.DictItemDeleteRes{}, nil
}

// BatchDelete 批量删除字典项
// 按字典项ID列表批量删除记录
func (s *sDictItem) BatchDelete(ctx context.Context, req *v1.DictItemBatchDeleteReq) (res *v1.DictItemBatchDeleteRes, err error) {
	if err = dictItemSpec.BatchDelete(ctx, req.Ids); err != nil {
		return nil, err
	}
	return &v1.DictItemBatchDeleteRes{}, nil
}

// QuickList 快捷字典项列表
// 登录用户即可访问，按字典编码查询该字典下的字典项
func (s *sDictItem) QuickList(ctx context.Context, req *v1.DictItemQuickListReq) (res v1.DictItemQuickListRes, err error) {
	dict, err := dao.Dict.Ctx(ctx).Where("code", req.Code).One()
	if err != nil {
		return nil, err
	}
	if len(dict) == 0 {
		return []v1.DictItemQuickRow{}, nil
	}
	rows, err := dao.DictItem.Ctx(ctx).Where("dict_id", dict["id"].Int64()).Order("sort, id").All()
	if err != nil {
		return nil, err
	}
	list := make([]v1.DictItemQuickRow, 0, len(rows))
	for _, r := range rows {
		list = append(list, v1.DictItemQuickRow{
			Id:    r["id"].Int64(),
			Name:  r["name"].String(),
			Value: r["value"].String(),
		})
	}
	return list, nil
}

// dictInfo 字典摘要
// 仅包含字典名称与编码
type dictInfo struct{ name, code string }

// dictInfoMap 查询字典ID到字典摘要的映射
func (s *sDictItem) dictInfoMap(ctx context.Context) (map[int64]dictInfo, error) {
	result := make(map[int64]dictInfo)
	rows, err := dao.Dict.Ctx(ctx).Fields("id, name, code").All()
	if err != nil {
		return nil, err
	}
	for _, r := range rows {
		result[r["id"].Int64()] = dictInfo{name: r["name"].String(), code: r["code"].String()}
	}
	return result, nil
}