package auth

import "testing"

// TestEnvelopeFrom guards the "501 Bad sender address syntax" regression:
// SMTP_FROM may carry a display name for the From: header, but the SMTP
// envelope sender (MAIL FROM) must be a bare address.
func TestEnvelopeFrom(t *testing.T) {
	cases := []struct {
		name string
		from string
		want string
	}{
		{"display name + unicode", "穿山甲 <noreply@mail.51yanmei.com>", "noreply@mail.51yanmei.com"},
		{"display name ascii", "Pangolin <no-reply@pangolin.app>", "no-reply@pangolin.app"},
		{"bare address", "no-reply@pangolin.app", "no-reply@pangolin.app"},
		{"angle only", "<noreply@mail.51yanmei.com>", "noreply@mail.51yanmei.com"},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			m := NewSMTPMailer(SMTPConfig{From: tc.from})
			if got := m.envelopeFrom(); got != tc.want {
				t.Fatalf("envelopeFrom(%q) = %q, want %q", tc.from, got, tc.want)
			}
		})
	}
}

// TestMaskEmail verifies error-log masking never leaks a full address.
func TestMaskEmail(t *testing.T) {
	cases := map[string]string{
		"chenxin880812@gmail.com": "ch***@gmail.com",
		"ab@x.com":                "***@x.com",
		"a@x.com":                 "***@x.com",
		"not-an-email":            "***",
	}
	for in, want := range cases {
		if got := maskEmail(in); got != want {
			t.Errorf("maskEmail(%q) = %q, want %q", in, got, want)
		}
	}
}