package com.chinaweal.youfool.course.controller;

import cn.dev33.satoken.stp.StpUtil;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.chinaweal.youfool.course.entity.Course;
import com.chinaweal.youfool.course.entity.CourseVideo;
import com.chinaweal.youfool.course.entity.CourseAttachment;
import com.chinaweal.youfool.course.entity.CourseComment;
import com.chinaweal.youfool.course.service.CourseService;
import com.chinaweal.youfool.course.service.CourseVideoService;
import com.chinaweal.youfool.course.service.CourseAttachmentService;
import com.chinaweal.youfool.course.service.CourseCommentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
import com.chinaweal.youfool.framework.springboot.rest.RestResult;
import com.chinaweal.youfool.framework.springboot.rest.BaseResultCode;
import com.baomidou.dynamic.datasource.annotation.DSTransactional;
import java.io.File;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.nio.file.Paths;
import java.nio.file.Path;
import java.util.UUID;

/**
 * 页面控制器
 *
 * @author lroyia
 * @since 2025/10/24
 **/
@Controller
public class PageController {

    @Autowired
    private CourseService courseService;

    @Autowired
    private CourseVideoService courseVideoService;

    @Autowired
    private CourseAttachmentService courseAttachmentService;

    @Autowired
    private CourseCommentService courseCommentService;

    /**
     * 登录页面
     *
     * @return 登录页面
     */
    @GetMapping("/login")
    public String loginPage() {
        return "login";
    }

    /**
     * 首页（带课程列表分页）
     *
     * @param pageNum    页码
     * @param pageSize   每页大小
     * @param courseName 课程名称搜索
     * @param model      模型对象
     * @return 首页
     */
    @GetMapping("/")
    public String index(@RequestParam(defaultValue = "1") Integer pageNum,
                        @RequestParam(defaultValue = "10") Integer pageSize,
                        @RequestParam(required = false) String courseName,
                        Model model) {
        if (!StpUtil.isLogin()) {
            return "redirect:/course/login";
        }

        // 获取课程分页数据
        IPage<Course> coursePage = courseService.getCoursePage(pageNum, pageSize, courseName, null);

        // 添加数据到模型
        model.addAttribute("coursePage", coursePage);
        model.addAttribute("courseName", courseName);
        model.addAttribute("pageNum", pageNum);
        model.addAttribute("pageSize", pageSize);

        return "index";
    }

    /**
     * 首页（带课程列表分页）
     *
     * @param pageNum    页码
     * @param pageSize   每页大小
     * @param courseName 课程名称搜索
     * @param model      模型对象
     * @return 首页
     */
    @GetMapping("/index")
    public String indexPage(@RequestParam(defaultValue = "1") Integer pageNum,
                           @RequestParam(defaultValue = "10") Integer pageSize,
                           @RequestParam(required = false) String courseName,
                           Model model) {
        if (!StpUtil.isLogin()) {
            return "redirect:/course/login";
        }

        // 获取课程分页数据
        IPage<Course> coursePage = courseService.getCoursePage(pageNum, pageSize, courseName, null);

        // 添加数据到模型
        model.addAttribute("coursePage", coursePage);
        model.addAttribute("courseName", courseName);
        model.addAttribute("pageNum", pageNum);
        model.addAttribute("pageSize", pageSize);

        return "index";
    }

    /**
     * 课程详情页面
     *
     * @param id           课程ID
     * @param commentPage 评论页码
     * @param model        模型对象
     * @return 课程详情页面
     */
    @GetMapping("/detail/{id}")
    public String courseDetail(@PathVariable String id,
                              @RequestParam(defaultValue = "1") Integer commentPage,
                              Model model) {
        if (!StpUtil.isLogin()) {
            return "redirect:/course/login";
        }

        // 获取课程基本信息
        Course course = courseService.getById(id);
        if (course == null) {
            return "redirect:/course/index";
        }

        // 获取课程视频信息
        CourseVideo courseVideo = courseVideoService.getCourseMainVideo(id);

        // 获取课程附件列表
        java.util.List<CourseAttachment> attachments = courseAttachmentService.getAttachmentsByCourseId(id);

        // 获取评论分页数据
        IPage<CourseComment> comments = courseCommentService.getCommentsByCourseId(id, commentPage, 10);

        // 添加数据到模型
        model.addAttribute("course", course);
        model.addAttribute("courseVideo", courseVideo);
        model.addAttribute("attachments", attachments);
        model.addAttribute("comments", comments);
        model.addAttribute("commentPage", commentPage);

        return "course-detail";
    }

    /**
     * 添加课程评论
     *
     * @param commentData 评论数据
     * @return 添加结果
     */
    @PostMapping("/comment/add")
    @ResponseBody
    public RestResult<Boolean> addComment(@RequestBody java.util.Map<String, Object> commentData) {
        if (!StpUtil.isLogin()) {
            return RestResult.error(BaseResultCode.BUSINESS_LOGIC_ERROR, "请先登录");
        }

        try {
            String courseId = (String) commentData.get("courseId");
            String commentText = (String) commentData.get("commentText");
            String parentId = (String) commentData.get("parentId");

            CourseComment comment = new CourseComment();
            comment.setCourseId(courseId);
            comment.setCommentText(commentText);
            comment.setParentId(parentId);
            comment.setCreateBy(StpUtil.getLoginIdAsString());

            boolean success = courseCommentService.save(comment);
            return success ? RestResult.ok(true) : RestResult.error(BaseResultCode.BUSINESS_LOGIC_ERROR, "评论发表失败");
        } catch (Exception e) {
            return RestResult.error(BaseResultCode.BUSINESS_LOGIC_ERROR, "评论发表失败：" + e.getMessage());
        }
    }

    /**
     * 下载课程附件
     *
     * @param attachmentId 附件ID
     * @return 附件文件
     */
    @GetMapping("/attachment/download/{attachmentId}")
    public org.springframework.http.ResponseEntity<org.springframework.core.io.Resource> downloadAttachment(@PathVariable String attachmentId) {
        if (!StpUtil.isLogin()) {
            return org.springframework.http.ResponseEntity.status(org.springframework.http.HttpStatus.FOUND)
                    .location(ServletUriComponentsBuilder.fromPath("/course/login").build().toUri())
                    .build();
        }

        CourseAttachment attachment = courseAttachmentService.getById(attachmentId);
        if (attachment == null) {
            return org.springframework.http.ResponseEntity.notFound().build();
        }

        try {
            java.io.File file = new java.io.File(attachment.getAbsoluteName());
            if (!file.exists()) {
                return org.springframework.http.ResponseEntity.notFound().build();
            }

            org.springframework.core.io.Resource resource = new org.springframework.core.io.UrlResource(file.toURI());

            return org.springframework.http.ResponseEntity.ok()
                    .header(org.springframework.http.HttpHeaders.CONTENT_DISPOSITION,
                            "attachment; filename=\"" + new String(attachment.getFileName().getBytes("UTF-8"), "ISO-8859-1") + "\"")
                    .header(org.springframework.http.HttpHeaders.CONTENT_TYPE, "application/octet-stream")
                    .body(resource);
        } catch (Exception e) {
            return org.springframework.http.ResponseEntity.status(org.springframework.http.HttpStatus.INTERNAL_SERVER_ERROR).build();
        }
    }

    /**
     * 发布课程页面
     *
     * @return 发布课程页面
     */
    @GetMapping("/publish")
    public String publishCoursePage(Model model) {
        if (!StpUtil.isLogin()) {
            return "redirect:/course/login";
        }
        return "course-publish";
    }

    /**
     * 发布课程
     *
     * @param courseName  课程名称
     * @param courseDesc  课程描述
     * @param videoFile   课程视频文件（可选）
     * @param attachment  课程附件文件（可选）
     * @param model       模型对象
     * @return 发布结果
     */
    @PostMapping("/publish")
    @DSTransactional
    @ResponseBody
    public RestResult<String> publishCourse(
            @RequestParam String courseName,
            @RequestParam String courseDesc,
            @RequestParam(required = false) MultipartFile videoFile,
            @RequestParam(required = false) MultipartFile attachment,
            Model model) {
        
        if (!StpUtil.isLogin()) {
            return RestResult.error(BaseResultCode.BUSINESS_LOGIC_ERROR, "请先登录");
        }

        if (courseName == null || courseName.trim().isEmpty()) {
            return RestResult.error(BaseResultCode.BUSINESS_LOGIC_ERROR, "课程标题不能为空");
        }

        if (courseDesc == null || courseDesc.trim().isEmpty()) {
            return RestResult.error(BaseResultCode.BUSINESS_LOGIC_ERROR, "课程描述不能为空");
        }

        try {
            // 创建课程
            Course course = new Course();
            course.setCourseName(courseName.trim());
            course.setCourseDesc(courseDesc.trim());
            course.setCourseDate(LocalDate.now());
            course.setCreateBy(StpUtil.getLoginIdAsString());
            course.setCreateTime(LocalDateTime.now());
            
            boolean courseSaved = courseService.save(course);
            if (!courseSaved) {
                return RestResult.error(BaseResultCode.BUSINESS_LOGIC_ERROR, "创建课程失败");
            }

            String courseId = course.getId();

            // 处理视频文件
            if (videoFile != null && !videoFile.isEmpty()) {
                String videoAttachmentId = saveUploadFile(videoFile, courseId, "video");
                if (videoAttachmentId != null) {
                    CourseVideo courseVideo = new CourseVideo();
                    courseVideo.setCourseId(courseId);
                    courseVideo.setSortIdx(1);
                    courseVideo.setVideoName(videoFile.getOriginalFilename());
                    courseVideo.setAttachmentId(videoAttachmentId);
                    courseVideo.setCreateBy(StpUtil.getLoginIdAsString());
                    courseVideo.setCreateTime(LocalDateTime.now());
                    
                    courseVideoService.save(courseVideo);
                }
            }

            // 处理附件文件
            if (attachment != null && !attachment.isEmpty()) {
                saveUploadFile(attachment, courseId, "attachment");
            }

            return RestResult.ok(courseId, "课程发布成功");

        } catch (Exception e) {
            e.printStackTrace();
            return RestResult.error(BaseResultCode.BUSINESS_LOGIC_ERROR, "课程发布失败：" + e.getMessage());
        }
    }

    /**
     * 保存上传的文件
     *
     * @param file     上传的文件
     * @param courseId 课程ID
     * @param type     文件类型（video或attachment）
     * @return 附件ID
     */
    private String saveUploadFile(MultipartFile file, String courseId, String type) {
        try {
            if (file.isEmpty()) {
                return null;
            }

            String originalFilename = file.getOriginalFilename();
            if (originalFilename == null) {
                return null;
            }

            String fileFormat = originalFilename.substring(originalFilename.lastIndexOf(".") + 1).toLowerCase();
            String newFileName = UUID.randomUUID().toString() + "." + fileFormat;

            // 创建上传目录
            String uploadDir = "../uploads/courses/" + LocalDate.now().getYear() + "/" + 
                              String.format("%02d", LocalDate.now().getMonthValue()) + "/" + 
                              String.format("%02d", LocalDate.now().getDayOfMonth());
            Path uploadPath = Paths.get(uploadDir);
            if (!uploadPath.toFile().exists()) {
                uploadPath.toFile().mkdirs();
            }

            String absolutePath = uploadDir + "/" + newFileName;

            // 保存文件
            File dest = new File(absolutePath);
            file.transferTo(dest);

            // 创建附件记录
            CourseAttachment attachment = new CourseAttachment();
            attachment.setCourseId(courseId);
            attachment.setFileName(originalFilename);
            attachment.setFileFormat(fileFormat);
            attachment.setAbsoluteName(absolutePath);
            attachment.setFileSize(file.getSize());
            attachment.setCreateBy(StpUtil.getLoginIdAsString());
            attachment.setCreateTime(LocalDateTime.now());

            boolean saved = courseAttachmentService.save(attachment);
            return saved ? attachment.getId() : null;

        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 流式播放课程视频
     *
     * @param attachmentId 附件ID
     * @return 视频文件流
     */
    @GetMapping("/course/video/stream/{attachmentId}")
    public org.springframework.http.ResponseEntity<org.springframework.core.io.Resource> streamVideo(@PathVariable String attachmentId) {
        if (!StpUtil.isLogin()) {
            return org.springframework.http.ResponseEntity.status(org.springframework.http.HttpStatus.FOUND)
                    .location(ServletUriComponentsBuilder.fromPath("/course/login").build().toUri())
                    .build();
        }

        CourseAttachment attachment = courseAttachmentService.getById(attachmentId);
        if (attachment == null) {
            return org.springframework.http.ResponseEntity.notFound().build();
        }

        try {
            java.io.File file = new java.io.File(attachment.getAbsoluteName());
            if (!file.exists()) {
                return org.springframework.http.ResponseEntity.notFound().build();
            }

            org.springframework.core.io.Resource resource = new org.springframework.core.io.UrlResource(file.toURI());

            String contentType = determineVideoContentType(attachment.getFileFormat());

            return org.springframework.http.ResponseEntity.ok()
                    .header(org.springframework.http.HttpHeaders.CONTENT_TYPE, contentType)
                    .header(org.springframework.http.HttpHeaders.ACCEPT_RANGES, "bytes")
                    .body(resource);
        } catch (Exception e) {
            return org.springframework.http.ResponseEntity.status(org.springframework.http.HttpStatus.INTERNAL_SERVER_ERROR).build();
        }
    }

    /**
     * 根据文件格式确定视频内容类型
     *
     * @param fileFormat 文件格式
     * @return MIME类型
     */
    private String determineVideoContentType(String fileFormat) {
        if (fileFormat == null) {
            return "video/mp4";
        }

        switch (fileFormat.toLowerCase()) {
            case "mp4":
                return "video/mp4";
            case "webm":
                return "video/webm";
            case "ogg":
                return "video/ogg";
            case "avi":
                return "video/x-msvideo";
            case "mov":
                return "video/quicktime";
            case "wmv":
                return "video/x-ms-wmv";
            case "flv":
                return "video/x-flv";
            default:
                return "video/mp4";
        }
    }
}