package impl

import (
	"context"
	"fmt"
	"gitee.com/talk-about-articles/keyauth-tz/apps/role"
	"github.com/infraboard/mcube/exception"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
)

func (s *service) save(ctx context.Context, ins *role.Role) error {
	// insertOne 和 insertMany 会根据定义模型的bson标签完成对应的文档类型入库，主要是bson标签
	if _, err := s.col.InsertOne(ctx, ins); err != nil {
		return exception.NewInternalServerError("inserted role(%s) document error, %s",
			ins.Spec.Name, err)
	}
	return nil
}

// GET,Describe
// filter 过滤器（Collection）,类似于mysql的where条件
// 过滤器内容就是按照文档中的任意一个键值对作为过滤条件 完成过滤查询
// 调用Decode方法来进行反序列化 bytes --> Object   (查询出来数据的反序列化)
func (s *service) get(ctx context.Context, id string) (*role.Role, error) {
	// 以主键的键值对为条件过滤   就是在json串中匹配  "_id: 1" 的json串
	filter := bson.M{"_id": id}

	ins := role.NewDefaultRole()
	// 通过Decode反序列化为Object对象
	if err := s.col.FindOne(ctx, filter).Decode(ins); err != nil {
		if err == mongo.ErrNoDocuments {
			return nil, exception.NewNotFound("role %s not found", id)
		}

		return nil, exception.NewInternalServerError("find role %s error, %s", id, err)
	}

	return ins, nil
}

func newQueryRoleRequest(r *role.QueryRoleRequest) *queryRoleRequest {
	return &queryRoleRequest{
		r,
	}
}

type queryRoleRequest struct {
	*role.QueryRoleRequest
}

func (r *queryRoleRequest) FindOptions() *options.FindOptions {
	pageSize := int64(r.Page.PageSize)
	skip := int64(r.Page.PageSize) * int64(r.Page.PageNumber-1)

	opt := &options.FindOptions{
		// 排序： Order By create_at Desc
		Sort: bson.D{
			{Key: "create_at", Value: -1},
		},
		Limit: &pageSize,
		Skip:  &skip,
	}

	return opt
}

// 过滤条件
// 由于Mongodb支持嵌套，JSON,如何过滤嵌套里面的条件，使用.访问嵌套对象属性
func (r *queryRoleRequest) FindFilter() bson.M {
	filter := bson.M{}
	if len(r.RoleNames) > 0 {
		//		IN ()
		filter["spec.name"] = bson.M{"$in": r.RoleNames}
	}
	return filter
}

func (s *service) query(ctx context.Context, req *queryRoleRequest) (*role.RoleSet, error) {
	resp, err := s.col.Find(ctx, req.FindFilter(), req.FindOptions())

	if err != nil {
		return nil, exception.NewInternalServerError("find role error, error is %s", err)
	}

	set := role.NewRoleSet()
	// 循环
	for resp.Next(ctx) {
		ins := role.NewDefaultRole()
		if err := resp.Decode(ins); err != nil {
			return nil, exception.NewInternalServerError("decode role error, error is %s", err)
		}

		set.Add(ins)
	}

	// count
	count, err := s.col.CountDocuments(ctx, req.FindFilter())
	if err != nil {
		return nil, exception.NewInternalServerError("get role count error, error is %s", err)
	}
	set.Total = count

	return set, nil
}

func (s *service) update(ctx context.Context, ins *role.Role) error {
	if _, err := s.col.UpdateByID(ctx, ins.Id, ins); err != nil {
		return exception.NewInternalServerError("inserted role(%s) document error, %s",
			ins.Spec.Name, err)
	}

	return nil
}

func (s *service) deleteRole(ctx context.Context, ins *role.Role) error {
	if ins == nil || ins.Id == "" {
		return fmt.Errorf("role is nil")
	}

	result, err := s.col.DeleteOne(ctx, bson.M{"_id": ins.Id})
	if err != nil {
		return exception.NewInternalServerError("delete role(%s) error, %s", ins.Id, err)
	}

	if result.DeletedCount == 0 {
		return exception.NewNotFound("role %s not found", ins.Id)
	}

	return nil
}