package pl.dmcs;

import org.apache.commons.lang3.tuple.Pair;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.io.TempDir;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.Path;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import static org.junit.jupiter.api.Assertions.*;

public class DataLoaderTest {

    @TempDir
    Path tempDir;

    private File createTempFileWithData(String userData, List<String> recipients) throws IOException {
        File tempFile = tempDir.resolve("testdata.csv").toFile();
        try (BufferedWriter writer = new BufferedWriter(new FileWriter(tempFile))) {
            writer.write(userData);
            writer.write("\n");
            for (String recipient : recipients) {
                writer.write(recipient);
                writer.write("\n");
            }
        }
        return tempFile;
    }

    private void assertUserData(User expectedUser, List<String> expectedRecipients, Pair<User, List<String>> result) {
        User actualUser = result.getLeft();
        List<String> actualRecipients = result.getRight();

        assertEquals(expectedUser.getFirstName(), actualUser.getFirstName());
        assertEquals(expectedUser.getLastName(), actualUser.getLastName());
        assertEquals(expectedUser.getEmail(), actualUser.getEmail());
        assertEquals(expectedRecipients, actualRecipients);
    }

    @Test
    public void testLoadData() throws IOException {
        File tempFile = createTempFileWithData("John,Doe,john.doe@example.com",
                Arrays.asList("recipient1@example.com", "recipient2@example.com", "recipient3@example.com"));

        User expectedUser = new User("John", "Doe", "john.doe@example.com");
        List<String> expectedRecipients = Arrays.asList("recipient1@example.com", "recipient2@example.com", "recipient3@example.com");

        Pair<User, List<String>> result = DataLoader.loadData(tempFile.getAbsolutePath());
        assertUserData(expectedUser, expectedRecipients, result);
    }

    @Test
    public void testLoadDataEmptyRecipients() throws IOException {
        File tempFile = createTempFileWithData("John,Doe,john.doe@example.com", Collections.emptyList());

        User expectedUser = new User("John", "Doe", "john.doe@example.com");
        List<String> expectedRecipients = Collections.emptyList();

        Pair<User, List<String>> result = DataLoader.loadData(tempFile.getAbsolutePath());
        assertUserData(expectedUser, expectedRecipients, result);
    }

    @Test
    public void testLoadDataInvalidFile() {
        assertThrows(IOException.class, () -> {
            DataLoader.loadData("invalid/path/to/file.csv");
        });
    }
}