package de.rwu.easydrop.util;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.fail;

import java.util.NoSuchElementException;

import javax.naming.ConfigurationException;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

class ConfigImplTest {
    private Config config;
    private final static String TESTDATA_PATH = "src/test/resources/testdata.properties";
    private final static String TESTDATA_KEY = "API_KEY";
    private final static String TESTDATA_VAL = "keyIsHere";

    @BeforeEach
    void setUp() {
        config = Config.getInstance();
    }

    @Test
    void testGetProperty_ExistingKey() throws ConfigurationException {
        config.setConfigLocation(TESTDATA_PATH);
        config.loadConfig();
        config.setProperty(TESTDATA_KEY, TESTDATA_VAL);

        String value = config.getProperty(TESTDATA_KEY);

        assertEquals(TESTDATA_VAL, value);
    }

    @Test
    void testGetProperty_ConfigNotLoaded() throws Exception {
        config.reset();

        NoSuchElementException exception = assertThrows(NoSuchElementException.class, () -> {
            config.getProperty(TESTDATA_KEY);
        });

        assertEquals("Config has not been loaded", exception.getMessage());
    }

    @Test
    void testGetProperty_NonExistingKey() {
        try {
            config.setConfigLocation(TESTDATA_PATH);
            config.loadConfig();

            NoSuchElementException exception = assertThrows(NoSuchElementException.class, () -> {
                config.getProperty("I_DONT_EXIST");
            });

            assertEquals("Requested config value does not exist", exception.getMessage());
        } catch (ConfigurationException e) {
            fail("ConfigurationException should not be thrown");
        }
    }

    @Test
    void testSetProperty() {
        try {
            config.setConfigLocation(TESTDATA_PATH);
            config.loadConfig();
            config.setProperty(TESTDATA_KEY, "12345");

            assertEquals("12345", config.getProperty(TESTDATA_KEY));
        } catch (ConfigurationException e) {
            fail("ConfigurationException should not be thrown");
        }
    }

    @Test
    void testLoadConfigSuccessfully() {
        try {
            config.setConfigLocation("src/test/resources/testdata.properties");
            config.loadConfig();
            assertEquals(TESTDATA_VAL, config.getProperty(TESTDATA_KEY));
        } catch (ConfigurationException e) {
            fail("ConfigurationException should not be thrown");
        }
    }

    @Test
    void testLoadConfigMissingFile() {
        config.setConfigLocation("path/that/doesnt/exist/config.properties");

        ConfigurationException exception = assertThrows(ConfigurationException.class, () -> {
            config.loadConfig();
        });

        assertEquals("Couldn't load required config file", exception.getMessage());
    }

    @Test
    void testReset() throws ConfigurationException {
        config.setConfigLocation("src/test/resources/testdata.properties");
        config.loadConfig();

        assertNotNull(config.getProperty(TESTDATA_KEY));
        config.reset();

        NoSuchElementException exception = assertThrows(NoSuchElementException.class, () -> {
            config.getProperty(TESTDATA_KEY);
        });

        assertEquals("Config has not been loaded", exception.getMessage());
    }
}