138 lines
3 KiB
Go
138 lines
3 KiB
Go
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package core
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import (
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"encoding/json"
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"errors"
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"github.com/shopspring/decimal"
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"gorm.io/gorm"
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)
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type DebtType int
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const (
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ProportionalDebt DebtType = iota
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AbsoluteDebt = iota
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)
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func (dt DebtType) String() string {
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return [...]string{"proportional", "absolute"}[dt]
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}
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func (dt DebtType) MarshalJSON() ([]byte, error) {
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return json.Marshal(dt.String())
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}
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func (dt *DebtType) UnmarshalJSON(data []byte) error {
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var s string
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if err := json.Unmarshal(data, &s); err != nil {
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return nil
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}
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if s == "proportional" {
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*dt = ProportionalDebt
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} else if s == "absolute" {
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*dt = AbsoluteDebt
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} else {
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return errors.New("Invalid value for debt type")
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}
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return nil
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}
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type DebtSpec struct {
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Member Member `json:"member"`
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Amount decimal.Decimal `json:"amount"`
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DebtType DebtType `json:"debt_type"`
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}
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func CreateExpense(db *gorm.DB, plan Plan, payer Member, amount decimal.Decimal) (*Expense, error) {
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expense := new(Expense)
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expense.Plan = plan
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expense.Payer = payer
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expense.Amount = amount
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err := db.Create(&expense).Error
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if err != nil {
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return nil, err
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}
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return expense, nil
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}
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func (e *Expense) GetDebt(db *gorm.DB) ([]Debt, error) {
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var debts []Debt
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if err := db.Model(e).Association("Debts").Find(&debts); err != nil {
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return []Debt{}, err
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}
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return debts, nil
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}
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func (e *Expense) SetDebt(db *gorm.DB, debtSpec []DebtSpec) error {
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abs_paid := decimal.Decimal{}
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debts := make([]Debt, 0)
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var prop_payers int64 = 0
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for _, debt := range debtSpec {
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if debt.DebtType == ProportionalDebt {
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prop_payers += 1
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} else {
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debts = append(debts, Debt{
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Amount: debt.Amount,
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Paid: decimal.Decimal{},
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ExpenseID: e.ID,
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DebtorID: debt.Member.ID,
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})
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abs_paid.Add(debt.Amount)
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}
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}
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if abs_paid.Cmp(e.Amount) > 0 {
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return errors.New("Absolute pay amount is larger than debt")
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}
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prop_debt := e.Amount.Sub(abs_paid).DivRound(decimal.NewFromInt(prop_payers), 2)
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return db.Transaction(func(tx *gorm.DB) error {
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for _, debt := range debts {
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if err := db.Create(&debt).Error; err != nil {
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return err
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}
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}
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for _, debt := range debtSpec {
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if debt.DebtType != ProportionalDebt {
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continue
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}
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if err := db.Create(&Debt{
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Amount: prop_debt,
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Paid: decimal.Decimal{},
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ExpenseID: e.ID,
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DebtorID: debt.Member.ID,
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}).Error; err != nil {
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return err
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}
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}
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return nil
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})
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}
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func (e *Expense) Delete(db *gorm.DB) error {
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return db.Transaction(func(tx *gorm.DB) error {
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if err := db.Model(e).Association("Debts").Delete(&[]Debt{}); err != nil {
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return err
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}
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return db.Delete(e, e).Error
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})
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}
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func ListExpenses(db *gorm.DB, plan Plan) ([]Expense, error) {
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var expenses []Expense
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if err := db.Where("plan_id = ?", plan.ID).Find(&expenses).Error; err != nil {
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return []Expense{}, err
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}
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return expenses, nil
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}
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func GetExpense(db *gorm.DB, expense_id uint) (*Expense, error) {
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expense := new(Expense)
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expense.ID = expense_id
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if err := db.Take(expense).Error; err != nil {
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return nil, err
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}
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return expense, nil
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}
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