package services

import (
	"context"

	"quyun/v2/app/requests"
	"quyun/v2/database/models"

	"github.com/pkg/errors"
	"github.com/samber/lo"
	"go.ipao.vip/gen"
)

// @provider
type users struct{}

// List returns a paginated list of users
func (m *users) List(
	ctx context.Context,
	pagination *requests.Pagination,
	conds ...gen.Condition,
) (*requests.Pager, error) {
	pagination.Format()
	_, query := models.UserQuery.QueryContext(ctx)

	items, cnt, err := query.Where(conds...).FindByPage(int(pagination.Offset()), int(pagination.Limit))
	if err != nil {
		return nil, errors.Wrap(err, "query users error")
	}

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

// PostList returns a paginated list of posts for a user
func (m *users) PostList(
	ctx context.Context,
	userId int64,
	pagination *requests.Pagination,
	conds ...gen.Condition,
) (*requests.Pager, error) {
	pagination.Format()
	// 	stmt := SELECT(tbl.AllColumns).
	// 		FROM(tbl.
	// 			RIGHT_JOIN(
	// 				tblUserPosts,
	// 				tblUserPosts.PostID.EQ(tbl.ID),
	// 			),
	// 		).
	// 		WHERE(CondTrue(cond...)).
	// 		ORDER_BY(tblUserPosts.ID.DESC()).
	// 		LIMIT(pagination.Limit).
	// 		OFFSET(pagination.Offset)
	// 	m.log().Infof("sql: %s", stmt.DebugSql())

	// 	var posts []Posts
	// 	err := stmt.QueryContext(ctx, db, &posts)
	// 	if err != nil {
	// 		if errors.Is(err, qrm.ErrNoRows) {
	// 			return &requests.Pager{
	// 				Items:      nil,
	// 				Total:      0,
	// 				Pagination: *pagination,
	// 			}, nil
	// 		}
	// 		m.log().Errorf("error querying posts: %v", err)
	// 		return nil, err
	// 	}

	// 	// total count
	// 	var cnt struct {
	// 		Cnt int64
	// 	}

	// 	stmtCnt := tblUserPosts.SELECT(COUNT(tblUserPosts.ID).AS("cnt")).WHERE(tblUserPosts.UserID.EQ(Int64(userId)))
	// 	m.log().Infof("sql: %s", stmtCnt.DebugSql())

	// 	if err := stmtCnt.QueryContext(ctx, db, &cnt); err != nil {
	// 		m.log().Errorf("error counting users: %v", err)
	// 		return nil, err
	// 	}

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

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

	tbl, query := models.UserQuery.QueryContext(ctx)
	items, err := query.Where(tbl.ID.In(ids...)).Find()
	if err != nil {
		return nil, errors.Wrapf(err, "failed to get users by ids:%v", ids)
	}

	return lo.KeyBy(items, func(item *models.User) int64 {
		return item.ID
	}), nil
}

// BatchCheckHasBought checks if the user has bought the given post IDs
func (m *users) BatchCheckHasBought(ctx context.Context, userId int64, postIDs []int64) (map[int64]bool, error) {
	tbl, query := models.UserPostQuery.QueryContext(ctx)
	userPosts, err := query.
		Where(
			tbl.UserID.Eq(userId),
			tbl.PostID.In(postIDs...),
		).
		Find()
	if err != nil {
		return nil, errors.Wrapf(err, "check user has bought failed, user_id: %d, post_ids: %+v", userId, postIDs)
	}

	result := make(map[int64]bool)
	for _, postID := range postIDs {
		result[postID] = false
	}

	for _, post := range userPosts {
		result[post.PostID] = true
	}
	return result, nil
}

// HasBought
func (m *users) HasBought(ctx context.Context, userID, postID int64) (bool, error) {
	tbl, query := models.UserPostQuery.QueryContext(ctx)
	cnt, err := query.
		Where(
			tbl.UserID.Eq(userID),
			tbl.PostID.Eq(postID),
		).
		Count()
	if err != nil {
		return false, errors.Wrap(err, "failed to check user bought")
	}
	return cnt > 0, nil
}

// SetUsername
func (m *users) SetUsername(ctx context.Context, userID int64, username string) error {
	tbl, query := models.UserQuery.QueryContext(ctx)
	_, err := query.
		Where(
			tbl.ID.Eq(userID),
		).
		Update(tbl.Username, username)
	if err != nil {
		return err
	}
	return nil
}

// BuyPosts
func (m *users) BuyPosts(ctx context.Context, userID, postID, price int64) error {
	model := &models.UserPost{UserID: userID, PostID: postID, Price: price}
	return model.Create(ctx)
}

// RevokePosts
func (m *users) RevokeUserPosts(ctx context.Context, userID, postID int64) error {
	tbl, query := models.UserPostQuery.QueryContext(ctx)
	_, err := query.Where(
		tbl.UserID.Eq(userID),
		tbl.PostID.Eq(postID),
	).Delete()
	return err
}

// FindByID
func (m *users) FindByID(ctx context.Context, userID int64) (*models.User, error) {
	tbl, query := models.UserQuery.QueryContext(ctx)
	user, err := query.Where(tbl.ID.Eq(userID)).First()
	if err != nil {
		return nil, errors.Wrapf(err, "find by id failed, id: %d", userID)
	}
	return user, nil
}

// SetBalance
func (m *users) SetBalance(ctx context.Context, userID, balance int64) error {
	tbl, query := models.UserQuery.QueryContext(ctx)
	_, err := query.Where(tbl.ID.Eq(userID)).Update(tbl.Balance, balance)

	return err
}

// AddBalance adds the given amount to the user's balance
func (m *users) AddBalance(ctx context.Context, userID, amount int64) error {
	tbl, query := models.UserQuery.QueryContext(ctx)
	_, err := query.Where(tbl.ID.Eq(userID)).Inc(tbl.Balance, amount)
	return err
}

// Desc desc the given amount to the user's balance
func (m *users) DescBalance(ctx context.Context, userID, amount int64) error {
	user, err := m.FindByID(ctx, userID)
	if err != nil {
		return err
	}
	if user.Balance < amount {
		return errors.New("balance not enough")
	}
	tbl, query := models.UserQuery.QueryContext(ctx)
	_, err = query.Where(tbl.ID.Eq(userID)).Inc(tbl.Balance, -amount)
	return err
}

// Count
func (m *users) Count(ctx context.Context, conds ...gen.Condition) (int64, error) {
	_, query := models.UserQuery.QueryContext(ctx)
	if len(conds) > 0 {
		query = query.Where(conds...)
	}
	return query.Count()
}