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package com.google.refine.expr.util;

import com.fasterxml.jackson.databind.JsonNode;

/**
 * Converts the a JSON value
 * 
 * @author antonin
 *
 */
public class JsonValueConverter {

    public static Object convert(JsonNode value) {
        if (value == null) {
            return null;
        }
        if (value.isObject()) {
            return value;
        } else if (value.isArray()) {
            return value;
        } else if (value.isBigDecimal() || value.isDouble() || value.isFloat()) {
            return value.asDouble();
        } else if (value.isBigInteger()) {
            return value.asLong();
        } else if (value.isInt()) {
            return value.asInt();
        } else if (value.isBinary() || value.isTextual()) {
            return value.asText();
        } else if (value.isBoolean()) {
            return value.asBoolean();
        } else if (value.isNull()) {
            return null;
        } else {
            return null;
        }
    }

    @SuppressWarnings("rawtypes")
    public static Comparable convertComparable(JsonNode value) {
        if (value == null) {
            return null;
        }
        if (value.isContainerNode()) {
            // TODO: return null instead (like fallthrough case)
            throw new IllegalArgumentException("Arrays and objects aren't comparable");
        } else if (value.isBigDecimal() || value.isDouble() || value.isFloat()) {
            return value.asDouble();
        } else if (value.isBigInteger()) {
            return value.asLong();
        } else if (value.isInt()) {
            return value.asInt();
        } else if (value.isBinary() || value.isTextual()) {
            return value.asText();
        } else if (value.isBoolean()) {
            return value.asBoolean();
        } else if (value.isNull()) {
            return null;
        } else {
            return null;
        }
    }

}