package pain

import (
	"fmt"
)

type GrpHdr struct {
	MessageId       string       `xml:"MsgId"`
	Timestamp       string       `xml:"CreDtTm"`
	NumTx           string       `xml:"NbOfTxs"`
	Sum             string       `xml:"CtrlSum"`
	InitiatingParty PartyIdSEPA1 `xml:"InitgPty"`
}

func (g *GrpHdr) Valid() error {
	var err []string
	if !SEPARegexps["MsgId"].MatchString(g.MessageId) {
		err = append(err, "msgId did not match expected format")
	}
	if !SEPARegexps["CreDtTm"].MatchString(g.Timestamp) {
		err = append(err, "timestamp did not match expected format")
	}
	if !SEPARegexps["NbOfTxs"].MatchString(g.NumTx) {
		err = append(err, "numtx did not match expected format")
	}
	if !SEPARegexps["CtrlSum"].MatchString(g.Sum) {
		err = append(err, "sum did not match expected format")
	}
	// Note: we assume g.InitiatingParty is initialized.
	if !SEPARegexps["Nm"].MatchString(g.InitiatingParty.Name) {
		err = append(err, "initiating party's name did not match expected format")
	}

	if len(err) > 0 {
		return fmt.Errorf("group header not valid: %v", strings.Join(err, ", "))
	}
	return nil
}