package com.talentcard.server.upload;

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

import java.nio.file.Files;
import java.nio.file.Path;
import java.util.stream.Stream;

import com.talentcard.server.common.BusinessException;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.io.TempDir;
import org.springframework.mock.web.MockMultipartFile;

class ImageUploadServiceTests {

	@TempDir
	Path temporaryDirectory;

	@Test
	void savesPngWithGeneratedFilename() throws Exception {
		ImageUploadService service = new ImageUploadService(temporaryDirectory);
		MockMultipartFile image = new MockMultipartFile(
				"file", "cover.png", "image/png", new byte[] {(byte) 0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a});

		ImageUploadResult result = service.upload(image);

		assertThat(result.url()).matches("/uploads/[0-9a-f-]+\\.png");
		try (Stream<Path> files = Files.list(temporaryDirectory)) {
			assertThat(files).hasSize(1);
		}
	}

	@Test
	void rejectsNonImageUploads() {
		ImageUploadService service = new ImageUploadService(temporaryDirectory);
		MockMultipartFile text = new MockMultipartFile("file", "cover.txt", "text/plain", "not an image".getBytes());

		assertThatThrownBy(() -> service.upload(text))
				.isInstanceOf(BusinessException.class)
				.hasMessageContaining("Only JPG, PNG, and WEBP");
	}

	@Test
	void savesPdfWithGeneratedFilename() throws Exception {
		ImageUploadService service = new ImageUploadService(temporaryDirectory);
		MockMultipartFile pdf = new MockMultipartFile("file", "window.pdf", "application/pdf", "%PDF-1.7".getBytes());

		ImageUploadResult result = service.uploadPdf(pdf);

		assertThat(result.url()).matches("/uploads/[0-9a-f-]+\\.pdf");
		try (Stream<Path> files = Files.list(temporaryDirectory)) {
			assertThat(files).hasSize(1);
		}
	}

	@Test
	void rejectsNonPdfUploads() {
		ImageUploadService service = new ImageUploadService(temporaryDirectory);
		MockMultipartFile image = new MockMultipartFile("file", "window.pdf", "application/pdf", "not a pdf".getBytes());

		assertThatThrownBy(() -> service.uploadPdf(image))
				.isInstanceOf(BusinessException.class)
				.hasMessageContaining("仅支持 PDF");
	}
}