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package com.google.refine.expr.functions;

import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertTrue;

import java.util.Properties;

import org.testng.annotations.Test;

import com.google.refine.RefineTest;
import com.google.refine.expr.EvalError;
import com.google.refine.grel.Function;
import com.google.refine.util.TestUtils;

public class ToNumberTests extends RefineTest {

    private static final Double EPSILON = 0.000001;
    static Properties bindings = new Properties();

    @Test
    public void serializeToNumber() {
        String json = "{\"description\":\"Returns o converted to a number\",\"params\":\"o\",\"returns\":\"number\"}";
        TestUtils.isSerializedTo(new ToNumber(), json);
    }

    @Test
    public void testConversions() {
        Function f = new ToNumber();
        assertEquals(f.call(bindings, new Object[] {Long.valueOf(11)}), Long.valueOf(11));
        assertEquals(f.call(bindings, new Object[] {"12"}), Long.valueOf(12));
        assertTrue((Double)f.call(bindings, new Object[] {"12345.6789"}) - Double.valueOf(12345.6789) < EPSILON);
        assertTrue(f.call(bindings, new Object[] {"abc"}) instanceof EvalError);
        }

    @Test
    public void testToNumber() {
        assertTrue(invoke("toNumber") instanceof EvalError);
        assertTrue(invoke("toNumber", (Object) null) instanceof EvalError);
        assertTrue(invoke("toNumber", "") instanceof EvalError);
        assertTrue(invoke("toNumber", "string") instanceof EvalError);
        assertEquals(invoke("toNumber", "0.0"), 0.0);
        assertEquals(invoke("toNumber", "123"), Long.valueOf(123));
        assertTrue(Math.abs((Double) invoke("toNumber", "123.456") - 123.456) < EPSILON);
        assertTrue(Math.abs((Double) invoke("toNumber", "001.234") - 1.234) < EPSILON);
        assertTrue(Math.abs((Double) invoke("toNumber", "1e2") - 100.0) < EPSILON);
        assertTrue(Math.abs((Double) invoke("toNumber", Double.parseDouble("100.0")) - 100.0) < EPSILON);
    }

}

