package com.baiyue.common.event;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertArrayEquals;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotEquals;

class EventPayloadCanonicalizerTest {
    private final ObjectMapper json = new ObjectMapper();

    @Test
    void equivalentNumberLexemesHaveTheSameCanonicalFormAndHash() throws Exception {
        var scaled = json.readTree("{\"weight\":30.0,\"volume\":0.3150,\"quantity\":3}");
        var normalized = json.readTree("{\"quantity\":3.0,\"volume\":0.315,\"weight\":3E+1}");
        assertArrayEquals(EventPayloadCanonicalizer.canonicalize(scaled), EventPayloadCanonicalizer.canonicalize(normalized));
        assertEquals(EventPayloadHash.sha256(EventPayloadCanonicalizer.canonicalize(scaled)),
            EventPayloadHash.sha256(EventPayloadCanonicalizer.canonicalize(normalized)));
    }

    @Test
    void negativeZeroIsZeroAndLegacyHashRemainsAvailable() throws Exception {
        var negativeZero = json.readTree("{\"value\":-0.000}");
        var zero = json.readTree("{\"value\":0}");
        assertArrayEquals(EventPayloadCanonicalizer.canonicalize(negativeZero), EventPayloadCanonicalizer.canonicalize(zero));
        assertNotEquals(EventPayloadHash.sha256(EventPayloadCanonicalizer.canonicalize(negativeZero)),
            EventPayloadHash.sha256(EventPayloadCanonicalizer.canonicalizeLegacy(negativeZero)));
    }
}