package auth

import "database/sql"

func (u *User) GetQuota(db *sql.DB) float32 {
	var quota float32
	if err := db.QueryRow("SELECT quota FROM quota WHERE user_id = ?", u.GetID(db)).Scan(&quota); err != nil {
		return 0.
	}
	return quota
}

func (u *User) GetUsedQuota(db *sql.DB) float32 {
	var quota float32
	if err := db.QueryRow("SELECT used FROM quota WHERE user_id = ?", u.GetID(db)).Scan(&quota); err != nil {
		return 0.
	}
	return quota
}

func (u *User) SetQuota(db *sql.DB, quota float32) bool {
	_, err := db.Exec(`
		INSERT INTO quota (user_id, quota, used) VALUES (?, ?, ?) ON DUPLICATE KEY UPDATE quota = ?
	`, u.GetID(db), quota, 0., quota)
	return err == nil
}

func (u *User) SetUsedQuota(db *sql.DB, used float32) bool {
	_, err := db.Exec(`
		INSERT INTO quota (user_id, quota, used) VALUES (?, ?, ?) ON DUPLICATE KEY UPDATE used = ?
	`, u.GetID(db), 0., used, used)
	return err == nil
}

func (u *User) IncreaseQuota(db *sql.DB, quota float32) bool {
	_, err := db.Exec(`
		INSERT INTO quota (user_id, quota, used) VALUES (?, ?, ?) ON DUPLICATE KEY UPDATE quota = quota + ?
	`, u.GetID(db), quota, 0., quota)
	return err == nil
}

func (u *User) IncreaseUsedQuota(db *sql.DB, used float32) bool {
	_, err := db.Exec(`
		INSERT INTO quota (user_id, quota, used) VALUES (?, ?, ?) ON DUPLICATE KEY UPDATE used = used + ?
	`, u.GetID(db), 0., used, used)
	return err == nil
}

func (u *User) DecreaseQuota(db *sql.DB, quota float32) bool {
	_, err := db.Exec(`
		INSERT INTO quota (user_id, quota, used) VALUES (?, ?, ?) ON DUPLICATE KEY UPDATE quota = quota - ?
	`, u.GetID(db), quota, 0., quota)
	return err == nil
}

func (u *User) UseQuota(db *sql.DB, quota float32) bool {
	if quota == 0 {
		return true
	}
	if !u.DecreaseQuota(db, quota) {
		return false
	}
	return u.IncreaseUsedQuota(db, quota)
}