package mailrelay

import "testing"

func TestFromDomain(t *testing.T) {
	cases := []struct {
		name    string
		raw     string
		want    string
		wantErr bool
	}{
		{"bare", "From: vaultwarden@felhom.eu\r\n\r\nbody", "felhom.eu", false},
		{"display name", "From: Vaultwarden <vaultwarden@felhom.eu>\r\n\r\nbody", "felhom.eu", false},
		{"uppercase domain", "From: x@FELHOM.EU\r\n\r\nbody", "felhom.eu", false},
		{"missing from", "To: x@y.eu\r\n\r\nbody", "", true},
		{"garbage", "From: not-an-address\r\n\r\nbody", "", true},
	}
	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			got, err := FromDomain([]byte(c.raw))
			if c.wantErr {
				if err == nil {
					t.Fatalf("expected error, got %q", got)
				}
				return
			}
			if err != nil {
				t.Fatalf("unexpected error: %v", err)
			}
			if got != c.want {
				t.Fatalf("got %q, want %q", got, c.want)
			}
		})
	}
}

// loginAuth must answer the LOGIN challenges with username then password and ignore the
// final non-"more" continuation.
func TestLoginAuth(t *testing.T) {
	a := &loginAuth{username: "resend", password: "secret-key"}

	mech, ir, err := a.Start(nil)
	if err != nil || mech != "LOGIN" || ir != nil {
		t.Fatalf("Start = (%q,%v,%v), want (LOGIN,nil,nil)", mech, ir, err)
	}

	resp, err := a.Next([]byte("Username:"), true)
	if err != nil || string(resp) != "resend" {
		t.Fatalf("username challenge → %q, %v", resp, err)
	}
	resp, err = a.Next([]byte("Password:"), true)
	if err != nil || string(resp) != "secret-key" {
		t.Fatalf("password challenge → %q, %v", resp, err)
	}
	// Unexpected challenge while more is expected → error (never blindly leak creds).
	if _, err := a.Next([]byte("Something:"), true); err == nil {
		t.Fatal("unexpected challenge should error")
	}
	// Non-more continuation → no response, no error.
	if resp, err := a.Next(nil, false); err != nil || resp != nil {
		t.Fatalf("non-more Next → %q, %v", resp, err)
	}
}