quyun/backend/app/model/posts.go

package model

import (
	"context"
	"time"

	"quyun/app/requests"
	"quyun/database/fields"

	. "github.com/go-jet/jet/v2/postgres"
	"github.com/samber/lo"
)

var tblPostsUpdateMutableColumns = tblPosts.MutableColumns.Except(
	tblPosts.CreatedAt,
	tblPosts.DeletedAt,
	tblPosts.Views,
	tblPosts.Likes,
)

func (m *Posts) CondStatus(s fields.PostStatus) Cond {
	return func(cond BoolExpression) BoolExpression {
		return cond.AND(tblPosts.Status.EQ(Int(int64(s))))
	}
}

func (m *Posts) CondLike(key *string) Cond {
	return func(cond BoolExpression) BoolExpression {
		tbl := tblPosts
		if key == nil || *key == "" {
			return cond
		}

		cond = cond.AND(
			tbl.Title.LIKE(String("%" + *key + "%")).
				OR(
					tbl.Content.LIKE(String("%" + *key + "%")),
				).
				OR(
					tbl.Description.LIKE(String("%" + *key + "%")),
				),
		)

		return cond
	}
}

func (m *Posts) IncrViewCount(ctx context.Context) error {
	tbl := tblPosts

	stmt := tbl.UPDATE(tbl.Views).
		SET(tbl.Views.ADD(Int64(1))).
		WHERE(tbl.ID.EQ(Int64(m.ID))).
		RETURNING(tblPosts.AllColumns)
	m.log().Infof("sql: %s", stmt.DebugSql())

	if err := stmt.QueryContext(ctx, db, m); err != nil {
		m.log().Errorf("error updating post view count: %v", err)
		return err
	}
	return nil
}

func (m *Posts) List(ctx context.Context, pagination *requests.Pagination, conds ...Cond) (*requests.Pager, error) {
	pagination.Format()

	cond := CondJoin(m.CondNotDeleted(), conds...)

	tbl := tblPosts
	stmt := tbl.
		SELECT(tbl.AllColumns).
		WHERE(CondTrue(cond...)).
		ORDER_BY(tbl.ID.DESC()).
		LIMIT(pagination.Limit).
		OFFSET(pagination.Offset)
	m.log().Infof("sql: %s", stmt.DebugSql())

	var posts []Posts = make([]Posts, 0)
	err := stmt.QueryContext(ctx, db, &posts)
	if err != nil {
		m.log().Errorf("error querying post items: %v", err)
		return nil, err
	}

	count, err := m.Count(ctx, CondJoin(m.CondNotDeleted(), conds...)...)
	if err != nil {
		m.log().Errorf("error getting post count: %v", err)
		return nil, err
	}

	return &requests.Pager{
		Items:      posts,
		Total:      count,
		Pagination: *pagination,
	}, nil
}

// SendTo
func (m *Posts) SendTo(ctx context.Context, userId int64) error {
	// add record to user_posts
	tbl := tblUserPosts
	stmt := tbl.INSERT(tbl.MutableColumns).MODEL(UserPosts{
		CreatedAt: time.Now(),
		UpdatedAt: time.Now(),
		UserID:    userId,
		PostID:    m.ID,
		Price:     -1,
	})
	m.log().Infof("sql: %s", stmt.DebugSql())
	if _, err := stmt.ExecContext(ctx, db); err != nil {
		m.log().Errorf("error sending post to user: %v", err)
		return err
	}
	return nil
}

// PostBoughtStatistics 获取指定文件 ID 的购买次数
func (m *Posts) BoughtStatistics(ctx context.Context, postIds []int64) (map[int64]int64, error) {
	tbl := tblUserPosts

	// select count(user_id), post_id from user_posts up  where post_id in (1, 2,3,4,5,6,7,8,9,10) group by post_id
	stmt := tbl.
		SELECT(
			COUNT(tbl.UserID).AS("cnt"),
			tbl.PostID.AS("post_id"),
		).
		WHERE(
			tbl.PostID.IN(IntExprSlice(postIds)...),
		).
		GROUP_BY(
			tbl.PostID,
		)
	m.log().Infof("sql: %s", stmt.DebugSql())

	var result []struct {
		Cnt    int64
		PostId int64
	}

	if err := stmt.QueryContext(ctx, db, &result); err != nil {
		m.log().Errorf("error getting post bought statistics: %v", err)
		return nil, err
	}

	// convert to map
	resultMap := make(map[int64]int64)
	for _, item := range result {
		resultMap[item.PostId] = item.Cnt
	}

	return resultMap, nil
}

// Bought
func (m *Posts) Bought(ctx context.Context, userId int64, pagination *requests.Pagination) (*requests.Pager, error) {
	pagination.Format()

	// select up.price,up.created_at,p.* from user_posts up  left join posts p on up.post_id = p.id where up.user_id =1
	tbl := tblUserPosts
	stmt := tbl.
		SELECT(
			tbl.Price.AS("price"),
			tbl.CreatedAt.AS("bought_at"),
			tblPosts.Title.AS("title"),
		).
		FROM(
			tbl.INNER_JOIN(tblPosts, tblPosts.ID.EQ(tbl.PostID)),
		).
		WHERE(
			tbl.UserID.EQ(Int64(userId)),
		).
		ORDER_BY(tbl.ID.DESC()).
		LIMIT(pagination.Limit).
		OFFSET(pagination.Offset)

	m.log().Infof("sql: %s", stmt.DebugSql())

	var items []struct {
		Title    string    `json:"title"`
		Price    int64     `json:"price"`
		BoughtAt time.Time `json:"bought_at"`
	}

	if err := stmt.QueryContext(ctx, db, &items); err != nil {
		m.log().Errorf("error getting bought posts: %v", err)
		return nil, err
	}

	// convert to Posts
	var cnt struct {
		Cnt int64
	}
	stmtCnt := tbl.
		SELECT(COUNT(tbl.ID).AS("cnt")).
		WHERE(
			tbl.UserID.EQ(Int64(userId)),
		)

	if err := stmtCnt.QueryContext(ctx, db, &cnt); err != nil {
		m.log().Errorf("error getting bought posts count: %v", err)
		return nil, err
	}

	return &requests.Pager{
		Items:      items,
		Total:      cnt.Cnt,
		Pagination: *pagination,
	}, nil
}

// GetPostsMapByIDs
func (m *Posts) GetPostsMapByIDs(ctx context.Context, ids []int64) (map[int64]Posts, error) {
	if len(ids) == 0 {
		return nil, nil
	}

	tbl := tblPosts
	stmt := tbl.
		SELECT(tbl.AllColumns).
		WHERE(
			tbl.ID.IN(IntExprSlice(ids)...),
		)

	m.log().Infof("sql: %s", stmt.DebugSql())

	var posts []Posts = make([]Posts, 0)
	err := stmt.QueryContext(ctx, db, &posts)
	if err != nil {
		m.log().Errorf("error querying posts: %v", err)
		return nil, err
	}

	return lo.SliceToMap(posts, func(item Posts) (int64, Posts) {
		return item.ID, item
	}), nil
}

// GetMediaByIds
func (m *Posts) GetMediaByIds(ctx context.Context, ids []int64) ([]Medias, error) {
	if len(ids) == 0 {
		return nil, nil
	}

	tbl := tblMedias
	stmt := tbl.
		SELECT(tbl.AllColumns).
		WHERE(
			tbl.ID.IN(IntExprSlice(ids)...),
		)

	m.log().Infof("sql: %s", stmt.DebugSql())

	var medias []Medias

	if err := stmt.QueryContext(ctx, db, &medias); err != nil {
		m.log().Errorf("error querying media: %v", err)
		return nil, err
	}

	return medias, nil
}

func (m *Posts) PayPrice() int64 {
	return m.Price * int64(m.Discount) / 100
}