package com.ots.common.utils.file;
import com.ots.common.exception.file.FileNameLengthLimitExceededException;
import com.ots.common.exception.file.FileSizeLimitExceededException;
import com.ots.common.exception.file.InvalidExtensionException;
import com.ots.common.utils.DateUtils;
import com.ots.common.utils.Md5Utils;
import com.ots.common.utils.StringUtils;
import com.ots.framework.config.EssConfig;
import org.apache.commons.io.FilenameUtils;
import org.springframework.web.multipart.MultipartFile;
import java.io.File;
import java.io.IOException;

public class FileUploadUtils {
    
    public static final long DEFAULT_MAX_SIZE = 50 * 1024 * 1024;
    
    public static final int DEFAULT_FILE_NAME_LENGTH = 100;
    
    private static String defaultBaseDir = EssConfig.getProfile();
    private static int counter = 0;
    public static void setDefaultBaseDir(String defaultBaseDir) {
        FileUploadUtils.defaultBaseDir = defaultBaseDir;
    }
    public static String getDefaultBaseDir() {
        return defaultBaseDir;
    }
    
    public static final String upload(MultipartFile file) throws IOException {
        try {
            return upload(getDefaultBaseDir(), file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }
    
    public static final String upload(String baseDir, MultipartFile file) throws IOException {
        try {
            return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }
    
    public static final String upload(String baseDir, MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException,
            InvalidExtensionException {
        int fileNamelength = file.getOriginalFilename().length();
        if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
            throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
        }
        assertAllowed(file, allowedExtension);
        String fileName = extractFilename(file);
        File desc = getAbsoluteFile(baseDir, fileName);
        file.transferTo(desc);
        String pathFileName = getPathFileName(baseDir, fileName);
        return pathFileName;
    }
    
    public static final String extractFilename(MultipartFile file) {
        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        fileName = DateUtils.datePath() + "/" + encodingFilename(fileName) + "." + extension;
        return fileName;
    }
    private static final File getAbsoluteFile(String uploadDir, String fileName) throws IOException {
        File desc = new File(uploadDir + File.separator + fileName);
        if (!desc.getParentFile().exists()) {
            desc.getParentFile().mkdirs();
        }
        if (!desc.exists()) {
            desc.createNewFile();
        }
        return desc;
    }
    private static final String getPathFileName(String uploadDir, String fileName) throws IOException {
        int dirLastIndex = uploadDir.lastIndexOf("/") + 1;
        String currentDir = StringUtils.substring(uploadDir, dirLastIndex);
        String pathFileName = "/profile/" + currentDir + "/" + fileName;
        return pathFileName;
    }
    
    private static final String encodingFilename(String fileName) {
        fileName = fileName.replace("_", " ");
        fileName = Md5Utils.hash(fileName + System.nanoTime() + counter++);
        return fileName;
    }
    
    public static final void assertAllowed(MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, InvalidExtensionException {
        long size = file.getSize();
        if (DEFAULT_MAX_SIZE != -1 && size > DEFAULT_MAX_SIZE) {
            throw new FileSizeLimitExceededException(DEFAULT_MAX_SIZE / 1024 / 1024);
        }
        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        if (allowedExtension != null && !isAllowedExtension(extension, allowedExtension)) {
            if (allowedExtension == MimeTypeUtils.IMAGE_EXTENSION) {
                throw new InvalidExtensionException.InvalidImageExtensionException(allowedExtension, extension,
                        fileName);
            } else if (allowedExtension == MimeTypeUtils.FLASH_EXTENSION) {
                throw new InvalidExtensionException.InvalidFlashExtensionException(allowedExtension, extension,
                        fileName);
            } else if (allowedExtension == MimeTypeUtils.MEDIA_EXTENSION) {
                throw new InvalidExtensionException.InvalidMediaExtensionException(allowedExtension, extension,
                        fileName);
            } else {
                throw new InvalidExtensionException(allowedExtension, extension, fileName);
            }
        }
    }
    
    public static final boolean isAllowedExtension(String extension, String[] allowedExtension) {
        for (String str : allowedExtension) {
            if (str.equalsIgnoreCase(extension)) {
                return true;
            }
        }
        return false;
    }
    
    public static final String getExtension(MultipartFile file) {
        String extension = FilenameUtils.getExtension(file.getOriginalFilename());
        if (StringUtils.isEmpty(extension)) {
            extension = MimeTypeUtils.getExtension(file.getContentType());
        }
        return extension;
    }
}