package policy

import "testing"

func TestInboundAllows(t *testing.T) {
	re, err := CompileSubject("(?i)invoice")
	if err != nil {
		t.Fatalf("compile: %v", err)
	}
	rule := InboundRule{
		WhitelistInEnabled: true,
		WhitelistIn:        []string{"@trusted.com"},
		SubjectRegex:       re,
	}
	cases := []struct {
		from, subject string
		want          bool
	}{
		{"bob@trusted.com", "Your Invoice #5", true},
		{"bob@trusted.com", "lunch?", false},        // subject fails
		{"eve@evil.com", "Invoice", false},          // sender fails
		{"eve@evil.com", "lunch?", false},           // both fail
	}
	for _, c := range cases {
		if got := rule.Allows(c.from, c.subject); got != c.want {
			t.Fatalf("Allows(%q,%q)=%v want %v", c.from, c.subject, got, c.want)
		}
	}
}

func TestInboundNoFiltersAllowsAll(t *testing.T) {
	rule := InboundRule{} // whitelist disabled, no regex
	if !rule.Allows("anyone@anywhere.com", "anything") {
		t.Fatal("empty rule must allow everything")
	}
}

func TestCompileSubjectEmpty(t *testing.T) {
	re, err := CompileSubject("")
	if err != nil || re != nil {
		t.Fatalf("empty pattern: re=%v err=%v", re, err)
	}
}