63 lines
1.6 KiB
Go
63 lines
1.6 KiB
Go
package db
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import (
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"database/sql"
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"fmt"
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)
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// GetClientReferralBalance retourne le solde parrainage d'un client.
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func (d *Database) GetClientReferralBalance(username string) (float64, error) {
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var balance float64
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err := d.QueryRow(
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`SELECT referral_balance FROM clients WHERE username = $1`,
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username,
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).Scan(&balance)
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if err == sql.ErrNoRows {
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return 0, fmt.Errorf("client non trouvé")
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}
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return balance, err
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}
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// CreditClientReferral ajoute un montant au solde parrainage d'un client.
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func (d *Database) CreditClientReferral(username string, amount float64) error {
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if amount <= 0 {
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return fmt.Errorf("le montant doit être positif")
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}
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res, err := d.Exec(
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`UPDATE clients SET referral_balance = referral_balance + $1 WHERE username = $2`,
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amount, username,
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)
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if err != nil {
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return err
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}
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n, _ := res.RowsAffected()
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if n == 0 {
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return fmt.Errorf("client non trouvé")
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}
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return nil
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}
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// UseClientReferralBalance déduit un montant du solde parrainage dans une transaction.
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// Retourne une erreur si le solde est insuffisant.
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func (d *Database) UseClientReferralBalance(tx *sql.Tx, username string, amount float64) error {
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if amount <= 0 {
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return nil
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}
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var balance float64
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err := tx.QueryRow(
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`SELECT referral_balance FROM clients WHERE username = $1 FOR UPDATE`,
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username,
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).Scan(&balance)
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if err != nil {
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return fmt.Errorf("client non trouvé")
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}
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if balance < amount {
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return fmt.Errorf("solde parrainage insuffisant (disponible: %.2f€)", balance)
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}
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_, err = tx.Exec(
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`UPDATE clients SET referral_balance = referral_balance - $1 WHERE username = $2`,
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amount, username,
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)
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return err
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}
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