package types

import (
	"time"

	"github.com/google/uuid"
)

// Transaction is at the center of the application.
//
// Every piece of data should be calculated based on transactions.
// This means potential calculation errors can be fixed later in time.
//
// If it becomes necessary to precalculate snapshots for performance reasons, this can be done in the future.
// But the transaction should always be the source of truth.
//
// There are the following constallations and their explanation:
//
//	Account	| TreasureChest	| Value	| Description
//	--------|---------------|-------|----------------
//	Y		| Y				| +		| Invalid
//	Y		| Y				| -		| Expense
//	Y		| N				| +		| Deposit
//	Y		| N				| -		| Withdrawal (for moving between accounts)
//	N		| Y				| +		| Saving
//	N		| Y				| -		| Withdrawal (for moving between treasure chests)
//	N		| N				| +		| Invalid
//	N		| N				| -		| Invalid
type Transaction struct {
	Id     uuid.UUID `db:"id"`
	UserId uuid.UUID `db:"user_id"`

	Timestamp   time.Time `db:"timestamp"`
	Party       string    `db:"party"`
	Description string    `db:"description"`

	AccountId       *uuid.UUID `db:"account_id"`
	TreasureChestId *uuid.UUID `db:"treasure_chest_id"`
	Value           int64      `db:"value"`

	// If an error is present, then the transaction is not valid and should not be used for calculations.
	Error     *string   `db:"error"`
	CreatedAt time.Time `db:"created_at"`
	// Either a user_id or a transaction_recurring_id
	CreatedBy uuid.UUID  `db:"created_by"`
	UpdatedAt *time.Time `db:"updated_at"`
	UpdatedBy *uuid.UUID `db:"updated_by"`
}

type TransactionItemsFilter struct {
	AccountId       string
	TreasureChestId string
	Error           string
	Page            string
}