package com.jayway.jsonassert.impl;


import com.jayway.jsonassert.JsonAsserter;
import com.jayway.jsonpath.JsonPath;
import org.hamcrest.Matcher;

import static java.lang.String.format;
import static org.hamcrest.Matchers.*;

/**
 * User: kalle stenflo
 * Date: 1/21/11
 * Time: 3:43 PM
 */
public class JsonAsserterImpl implements JsonAsserter {


    private final Object jsonObject;


    /**
     * Instantiates a new JSONAsserter
     *
     * @param jsonObject the object to make asserts on
     */
    public JsonAsserterImpl(Object jsonObject) {
        this.jsonObject = jsonObject;
    }


    /**
     * {@inheritDoc}
     */
    @SuppressWarnings("unchecked")
    public <T> JsonAsserter assertThat(String path, Matcher<T> matcher) {
        T obj = JsonPath.<T>read(jsonObject, path);
        if (!matcher.matches(obj)) {

            throw new AssertionError(String.format("JSON doesn't match.\nExpected:\n%s\nActual:\n%s", matcher.toString(), obj));
        }
        return this;
    }

    /**
     * {@inheritDoc}
     */
    public <T> JsonAsserter assertEquals(String path, T expected) {
        return assertThat(path, equalTo(expected));
    }

    /**
     * {@inheritDoc}
     */
    public JsonAsserter assertNotDefined(String path) {
        Object o = JsonPath.read(jsonObject, path);

        if (o != null) {
            throw new AssertionError(format("Document contains the path <%s> but was expected not to.", path));
        }
        return this;
    }

    /**
     * {@inheritDoc}
     */
    public JsonAsserter assertNull(String path) {
        return assertThat(path, nullValue());
    }

    /**
     * {@inheritDoc}
     */
    public <T> JsonAsserter assertNotNull(String path) {
        return assertThat(path, notNullValue());
    }

    /**
     * {@inheritDoc}
     */
    public JsonAsserter and() {
        return this;
    }

}