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path: root/go/bank-account/bank_account.go
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package account

import "sync"

type Account struct {
	balance int64
	open    bool
	sync.Mutex
}

func Open(inital int64) *Account {
	if inital < 0 {
		return nil
	}
	return &Account{balance: inital, open: true}
}

func (a *Account) Close() (int64, bool) {
	a.Lock()
	defer a.Unlock()
	if a.open {
		a.open = false
		return a.balance, true
	}
	return 0, false
}

func (a *Account) Balance() (int64, bool) {
	a.Lock()
	defer a.Unlock()
	if a.open {
		return a.balance, true
	}
	return 0, false
}

func (a *Account) Deposit(amount int64) (int64, bool) {
	a.Lock()
	defer a.Unlock()
	if a.open {
		if a.balance < -amount {
			return 0, false
		}
		a.balance += amount
		return a.balance, true
	}
	return 0, false
}