package ledger

import (
	"github.com/howeyc/ledger"
)

type File string

func NewFile(p string) (File, error) {
	f := File(p)
	_, err := f.Deltas()
	return f, err
}

func (file File) Deltas(likes ...Like) ([]Delta, error) {
	transactions, err := file.transactions()
	if err != nil {
		return nil, err
	}
	result := make([]Delta, 0, len(transactions)*2)
	for _, transaction := range transactions {
		for _, delta := range newDeltas(transaction) {
			if got := func() bool {
				for _, like := range likes {
					if !like(delta) {
						return false
					}
				}
				return true
			}(); !got {
				continue
			}
			result = append(result, delta)
		}
	}
	return result, nil
}

func (file File) transactions() ([]*ledger.Transaction, error) {
	return ledger.ParseLedgerFile(string(file))
}