package com.mailserver.service;

import jakarta.mail.Session;
import jakarta.mail.internet.MimeMessage;
import org.junit.jupiter.api.Test;

import java.io.ByteArrayInputStream;
import java.nio.charset.StandardCharsets;
import java.util.Properties;

import static org.assertj.core.api.Assertions.assertThat;

class LocalDeliveryTest {

    private static MimeMessage parse(String text) throws Exception {
        return new MimeMessage(Session.getInstance(new Properties()), new ByteArrayInputStream(text.getBytes(StandardCharsets.UTF_8)));
    }

    @Test
    void prefersHtmlInNestedAlternativeAndSkipsAttachments() throws Exception {
        MimeMessage message = parse("""
                Content-Type: multipart/mixed; boundary="m"\r
                \r
                --m\r
                Content-Type: multipart/alternative; boundary="a"\r
                \r
                --a\r
                Content-Type: text/plain\r
                \r
                plain\r
                --a\r
                Content-Type: text/html\r
                \r
                <p>html</p>\r
                --a--\r
                --m\r
                Content-Type: text/html\r
                Content-Disposition: attachment; filename="x.html"\r
                \r
                <p>attached</p>\r
                --m--\r
                """);

        LocalDelivery.Body body = LocalDelivery.body(message);
        assertThat(body.html()).isTrue();
        assertThat(body.text()).contains("<p>html</p>").doesNotContain("attached");
    }

    @Test
    void plainTextMessage() throws Exception {
        LocalDelivery.Body body = LocalDelivery.body(parse("Subject: x\r\n\r\njust text\r\n"));
        assertThat(body.html()).isFalse();
        assertThat(body.text()).isEqualTo("just text\r\n");
    }
}