package com.zhentao.osspicture;

import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.model.ObjectMetadata;
import com.aliyun.oss.model.PutObjectRequest;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

@Component
@Slf4j
public class OssUtil {

    // 从配置文件中读取OSS相关信息
    private static final String endpoint = "https://oss-cn-beijing.aliyuncs.com";
    private static final String accessKeyId = "LTAI5tH9VHPZwGJu4UX3hrL5";
    private static final String accessKeySecret = "mbsutFJYLkzosvvKNr0DD28XSg4mqA";
    private static final String bucketName = "fjj1";
    private static final boolean useCDN =  true;

    private static final String cdnDomain = "https://cdn.yourdomain.com";

    // MIME类型到扩展名的映射
    private static final Map<String, String> MIME_TO_EXTENSION = new HashMap<>();
    static {
        // 图片类型
        MIME_TO_EXTENSION.put("image/jpeg", "jpg");
        MIME_TO_EXTENSION.put("image/png", "png");
        MIME_TO_EXTENSION.put("image/gif", "gif");
        MIME_TO_EXTENSION.put("image/bmp", "bmp");
        MIME_TO_EXTENSION.put("image/webp", "webp");
        MIME_TO_EXTENSION.put("image/svg+xml", "svg");

        // 视频类型
        MIME_TO_EXTENSION.put("video/mp4", "mp4");
        MIME_TO_EXTENSION.put("video/quicktime", "mov");
        MIME_TO_EXTENSION.put("video/x-msvideo", "avi");
        MIME_TO_EXTENSION.put("video/x-matroska", "mkv");
        MIME_TO_EXTENSION.put("video/x-flv", "flv");
        MIME_TO_EXTENSION.put("video/webm", "webm");

        // 音频类型
        MIME_TO_EXTENSION.put("audio/mpeg", "mp3");
        MIME_TO_EXTENSION.put("audio/wav", "wav");
        MIME_TO_EXTENSION.put("audio/ogg", "ogg");
        MIME_TO_EXTENSION.put("audio/flac", "flac");
        MIME_TO_EXTENSION.put("audio/aac", "aac");

        // 文档类型
        MIME_TO_EXTENSION.put("application/pdf", "pdf");
        MIME_TO_EXTENSION.put("application/msword", "doc");
        MIME_TO_EXTENSION.put("application/vnd.openxmlformats-officedocument.wordprocessingml.document", "docx");
        MIME_TO_EXTENSION.put("application/vnd.ms-excel", "xls");
        MIME_TO_EXTENSION.put("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "xlsx");
        MIME_TO_EXTENSION.put("application/vnd.ms-powerpoint", "ppt");
        MIME_TO_EXTENSION.put("application/vnd.openxmlformats-officedocument.presentationml.presentation", "pptx");
        MIME_TO_EXTENSION.put("text/plain", "txt");
    }


    public String uploadFile(MultipartFile file) throws IOException {
        if (file == null || file.isEmpty()) {
            throw new IllegalArgumentException("上传文件不能为空");
        }

        OSS ossClient = null;
        try {
            ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);

            String originalFilename = file.getOriginalFilename();
            String contentType = file.getContentType();
            long fileSize = file.getSize();

            // 确定文件类型和扩展名
            FileTypeInfo fileTypeInfo = determineFileType(originalFilename, contentType);
            String extension = fileTypeInfo.getExtension();
            String fileCategory = fileTypeInfo.getCategory();

            // 生成唯一的文件名
            String fileName = generateUniqueFileName(fileCategory, extension);

            // 创建文件元数据
            ObjectMetadata metadata = createMetadata(originalFilename, contentType, fileSize, fileCategory);

            // 上传文件
            try (InputStream inputStream = file.getInputStream()) {
                PutObjectRequest putObjectRequest = new PutObjectRequest(
                        bucketName,
                        fileName,
                        inputStream,
                        metadata
                );
                ossClient.putObject(putObjectRequest);
            }

            // 生成文件访问URL
            String fileUrl = generateFileUrl(fileName);
            log.info("文件上传成功: {} ({}), 大小: {} KB, URL: {}",
                    originalFilename, fileCategory, fileSize / 1024, fileUrl);

            return fileUrl;
        } catch (Exception e) {
            log.error("文件上传失败: {}", e.getMessage(), e);
            throw new IOException("文件上传失败: " + e.getMessage(), e);
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }
    }

    private String generateUniqueFileName(String category, String extension) {
        return "uploads/" + category + "/" + UUID.randomUUID() + "." + extension;
    }

    private ObjectMetadata createMetadata(String filename, String contentType,
                                          long fileSize, String category) {
        ObjectMetadata metadata = new ObjectMetadata();

        // 设置基础元数据
        metadata.setContentType(contentType != null ? contentType : "application/octet-stream");
        metadata.setContentLength(fileSize);

        // 设置下载时的文件名
        if (filename != null) {
            metadata.setContentDisposition("attachment; filename=\"" + filename + "\"");
        }

        // 添加自定义元数据
        metadata.addUserMetadata("Original-Filename", filename != null ? filename : "");
        metadata.addUserMetadata("File-Category", category);

        return metadata;
    }

    private FileTypeInfo determineFileType(String filename, String contentType) {
        String extension = "bin";
        String category = "other";

        // 1. 尝试从文件名获取扩展名
        if (filename != null && filename.contains(".")) {
            String fileExt = filename.substring(filename.lastIndexOf(".") + 1).toLowerCase();
            if (isValidExtension(fileExt)) {
                extension = fileExt;
                category = determineCategory(extension);
            }
        }

        // 2. 如果扩展名无效，尝试从内容类型获取
        if ("bin".equals(extension) && contentType != null) {
            // 使用映射表获取标准扩展名
            String mappedExt = MIME_TO_EXTENSION.get(contentType.toLowerCase());
            if (mappedExt != null) {
                extension = mappedExt;
                category = determineCategory(extension);
            }
        }

        // 3. 最终确定文件分类
        if ("other".equals(category)) {
            category = determineCategory(extension);
        }

        return new FileTypeInfo(extension, category);
    }

    private boolean isValidExtension(String ext) {
        // 检查扩展名是否有效（不含特殊字符）
        return ext.matches("[a-z0-9]{1,10}");
    }

    private String determineCategory(String extension) {
        if (extension.matches("png|jpe?g|gif|bmp|webp|svg|heic|heif")) {
            return "images";
        } else if (extension.matches("mp4|mov|avi|mkv|flv|webm|m4v|wmv|3gp")) {
            return "videos";
        } else if (extension.matches("mp3|wav|ogg|flac|aac|m4a|wma|amr")) {
            return "audios";
        } else if (extension.matches("pdf|docx?|xlsx?|pptx?|txt|rtf|csv|pages|numbers|key")) {
            return "documents";
        } else if (extension.matches("zip|rar|7z|tar|gz")) {
            return "archives";
        }
        return "other";
    }

    private String generateFileUrl(String fileName) {
        // 使用CDN加速域名（如果配置了），否则使用标准OSS域名
        if (useCDN && cdnDomain != null && !cdnDomain.isEmpty()) {
            return cdnDomain + "/" + fileName;
        }

        // 构建标准OSS域名
        String domain = endpoint.startsWith("http") ?
                endpoint : "https://" + endpoint;

        return domain.replaceFirst("://", "://" + bucketName + ".") + "/" + fileName;
    }

    // 文件类型信息辅助类
    private static class FileTypeInfo {
        private final String extension;
        private final String category;

        public FileTypeInfo(String extension, String category) {
            this.extension = extension;
            this.category = category;
        }

        public String getExtension() {
            return extension;
        }

        public String getCategory() {
            return category;
        }
    }


}