package rules

import "testing"

func TestEvaluate(t *testing.T) {
	cases := []struct {
		operator  string
		value     float64
		threshold float64
		want      bool
	}{
		{">", 29, 28, true},
		{">", 27, 28, false},
		{"<", 27, 28, true},
		{"<", 29, 28, false},
		{">=", 28, 28, true},
		{"<=", 28, 28, true},
		{"=", 28, 28, true},
		{"=", 28.1, 28, false},
		{"!=", 28.1, 28, true},
		{"!=", 28, 28, false},
	}

	for _, c := range cases {
		got, err := Evaluate(c.operator, c.value, c.threshold)
		if err != nil {
			t.Fatalf("operator %q: unexpected error: %v", c.operator, err)
		}
		if got != c.want {
			t.Errorf("Evaluate(%q, %v, %v) = %v, want %v", c.operator, c.value, c.threshold, got, c.want)
		}
	}
}

func TestEvaluate_UnknownOperator(t *testing.T) {
	if _, err := Evaluate("~=", 1, 2); err == nil {
		t.Fatal("expected error for unknown operator")
	}
}