package mail

import (
	"fmt"
	"time"
)

// VerifyWindow is how long a verification or invitation link stays usable. It
// is stated in the email, so it lives beside the message rather than in the
// caller.
const VerifyWindow = 24 * time.Hour

// SendVerification asks someone to confirm the address they signed up with.
// The link is built from the Sender's PublicURL, because the address of the
// portal is a property of the deployment, not of the call site.
func (s Sender) SendVerification(to, token string) error {
	return s.sendTemplate(to, "", "verification", s.verificationData(to, token))
}

// verificationData is split from its Send method, as every message's is, so
// render_test.go renders the exact struct the message is sent with.
func (s Sender) verificationData(to, token string) any {
	return struct {
		Email    string
		Link     string
		TTLHours int
		Expires  time.Time
	}{
		Email:    to,
		Link:     fmt.Sprintf("%s/verify?token=%s", s.PublicURL, token),
		TTLHours: int(VerifyWindow.Hours()),
		Expires:  time.Now().UTC().Add(VerifyWindow),
	}
}

// SendInvite asks someone to join an existing account and set their own
// password. It names the account, because an unexpected invitation from a
// service you have never used is otherwise indistinguishable from spam.
func (s Sender) SendInvite(to, accountName, token string) error {
	return s.sendTemplate(to, "", "invite", s.inviteData(to, accountName, token))
}

func (s Sender) inviteData(to, accountName, token string) any {
	return struct {
		Email       string
		AccountName string
		Link        string
		TTLHours    int
	}{
		Email:       to,
		AccountName: accountName,
		Link:        fmt.Sprintf("%s/accept-invite?token=%s", s.PublicURL, token),
		TTLHours:    int(VerifyWindow.Hours()),
	}
}