package com.njcn.rdms.module.system.controller.admin.file;

import cn.hutool.core.io.IoUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.core.util.URLUtil;
import com.njcn.rdms.framework.common.pojo.CommonResult;
import com.njcn.rdms.framework.common.pojo.PageResult;
import com.njcn.rdms.framework.common.util.object.BeanUtils;
import com.njcn.rdms.module.system.controller.admin.file.vo.file.*;
import com.njcn.rdms.module.system.dal.dataobject.file.FileDO;
import com.njcn.rdms.module.system.service.file.FileService;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.Parameter;
import io.swagger.v3.oas.annotations.Parameters;
import io.swagger.v3.oas.annotations.media.Schema;
import io.swagger.v3.oas.annotations.tags.Tag;
import jakarta.annotation.Resource;
import jakarta.annotation.security.PermitAll;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.validation.Valid;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpStatus;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.nio.charset.StandardCharsets;
import java.util.List;

import static com.njcn.rdms.framework.common.pojo.CommonResult.success;
import static com.njcn.rdms.module.system.framework.file.core.utils.FileTypeUtils.writeAttachment;

@Tag(name = "管理后台 - 文件存储")
@RestController
@RequestMapping("/system/file")
@Validated
@Slf4j
public class FileController {

    @Resource
    private FileService fileService;

    @PostMapping("/upload")
    @Operation(summary = "上传文件", description = "模式一：后端上传文件")
    @Parameter(name = "file", description = "文件附件", required = true,
            schema = @Schema(type = "string", format = "binary"))
    public CommonResult<FileUploadRespVO> uploadFile(@Valid FileUploadReqVO uploadReqVO) throws Exception {
        MultipartFile file = uploadReqVO.getFile();
        byte[] content = IoUtil.readBytes(file.getInputStream());
        FileDO fileDO = fileService.createFile(content, file.getOriginalFilename(),
                uploadReqVO.getDirectory(), file.getContentType());
        return success(new FileUploadRespVO(String.valueOf(fileDO.getId()),
                fileDO.getConfigId(), fileDO.getPath(), fileDO.getUrl()));
    }

    @GetMapping("/presigned-url")
    @Operation(summary = "获取文件预签名地址（上传）", description = "模式二：前端上传文件：用于前端直接上传七牛、阿里云 OSS 等文件存储器")
    @Parameters({
            @Parameter(name = "name", description = "文件名称", required = true),
            @Parameter(name = "directory", description = "文件目录")
    })
    public CommonResult<FilePresignedUrlRespVO> getFilePresignedUrl(
            @RequestParam("name") String name,
            @RequestParam(value = "directory", required = false) String directory) {
        return success(fileService.presignPutUrl(name, directory));
    }

    @PostMapping("/create")
    @Operation(summary = "创建文件", description = "模式二：前端上传文件：配合 presigned-url 接口，记录上传了上传的文件")
    public CommonResult<Long> createFile(@Valid @RequestBody FileCreateReqVO createReqVO) {
        return success(fileService.createFile(createReqVO));
    }

    @GetMapping("/get")
    @Operation(summary = "获得文件")
    @Parameter(name = "id", description = "编号", required = true)
    @PreAuthorize("@ss.hasPermission('system:file:query')")
    public CommonResult<FileRespVO> getFile(@RequestParam("id") Long id) {
        return success(BeanUtils.toBean(fileService.getFile(id), FileRespVO.class));
    }

    @DeleteMapping("/delete")
    @Operation(summary = "删除文件")
    @Parameter(name = "id", description = "编号", required = true)
    // 权限下沉到 FileService：上传者本人可删自己上传的文件，其余需 system:file:delete 权限。
    // 故意不挂 @PreAuthorize，否则无该权限码的上传者会在进方法体前被 AOP 挡死（口径同项目域"属主放行+权限码兜底"）。
    public CommonResult<Boolean> deleteFile(@RequestParam("id") Long id) throws Exception {
        fileService.deleteFile(id);
        return success(true);
    }

    @DeleteMapping("/delete-list")
    @Operation(summary = "批量删除文件")
    @Parameter(name = "ids", description = "编号列表", required = true)
    // 权限下沉到 FileService：逐个按上传者归属校验，其余需 system:file:delete 权限（见 deleteFile 注释）。
    public CommonResult<Boolean> deleteFileList(@RequestParam("ids") List<Long> ids) throws Exception {
        fileService.deleteFileList(ids);
        return success(true);
    }

    @GetMapping("/download")
    @Operation(summary = "下载文件")
    @Parameter(name = "id", description = "编号", required = true)
    //@PreAuthorize("@ss.hasPermission('system:file:query')")
    public void downloadFile(@RequestParam("id") Long id, HttpServletResponse response) throws Exception {
        FileDO file = fileService.getFile(id);
        byte[] content = fileService.getFileContent(file.getConfigId(), file.getPath());
        if (content == null) {
            log.warn("[downloadFile][id({}) configId({}) path({}) 文件不存在]", id, file.getConfigId(), file.getPath());
            response.setStatus(HttpStatus.NOT_FOUND.value());
            return;
        }
        writeAttachment(response, StrUtil.blankToDefault(file.getName(), file.getPath()), content);
    }

    @GetMapping("/{configId}/get/**")
    @PermitAll
    @Operation(summary = "获取文件内容（匿名）", description = "富文本 <img src> 等匿名场景使用：图片走 inline 内联渲染，其它类型走 attachment 下载")
    @Parameter(name = "configId", description = "配置编号", required = true)
    public void getFileContent(HttpServletRequest request,
                               HttpServletResponse response,
                               @PathVariable("configId") Long configId) throws Exception {
        // 获取请求的路径
        String path = StrUtil.subAfter(request.getRequestURI(), "/get/", false);
        if (StrUtil.isEmpty(path)) {
            throw new IllegalArgumentException("结尾的 path 路径必须传递");
        }
        // 解码，解决中文路径的问题
        // https://gitee.com/zhijiantianya/ruoyi-vue-pro/pulls/807/
        // https://gitee.com/zhijiantianya/ruoyi-vue-pro/pulls/1432/
        path = URLUtil.decode(path, StandardCharsets.UTF_8, false);

        FileDO file = fileService.getFileByConfigIdAndPath(configId, path);
        if (file == null) {
            log.warn("[getFileContent][configId({}) path({}) 文件不存在]", configId, path);
            response.setStatus(HttpStatus.NOT_FOUND.value());
            return;
        }

        // 读取内容
        byte[] content = fileService.getFileContent(configId, path);
        if (content == null) {
            log.warn("[getFileContent][configId({}) path({}) 文件不存在]", configId, path);
            response.setStatus(HttpStatus.NOT_FOUND.value());
            return;
        }
        writeAttachment(response, StrUtil.blankToDefault(file.getName(), file.getPath()), content);
    }

    @GetMapping("/page")
    @Operation(summary = "获得文件分页")
    @PreAuthorize("@ss.hasPermission('system:file:query')")
    public CommonResult<PageResult<FileRespVO>> getFilePage(@Valid FilePageReqVO pageVO) {
        PageResult<FileDO> pageResult = fileService.getFilePage(pageVO);
        return success(BeanUtils.toBean(pageResult, FileRespVO.class));
    }

}

