package cmd

import (
	"flag"
	"fmt"
)

func balance(args []string) error {
	fs := flag.NewFlagSet("balance", flag.ExitOnError)
	var userId int64
	fs.Int64Var(&userId, "userId", 0, "Id of user (required)")
	fs.Parse(args)

	if userId <= 0 {
		fs.Usage()
		return fmt.Errorf("Missing userId")
	}

	tx, err := readDb()
	if err != nil {
		return err
	}

	total := float64(0)

	for _, r := range tx.Records {
		if r.UserId == uint64(userId) {
			total += r.Amount
		}
	}
	fmt.Printf("UserId: %d\n", userId)
	fmt.Printf("Balance: %f\n", total)

	return nil
}