package com.qf.myafterprojecy.controller;

import com.qf.myafterprojecy.pojo.ResponseMessage;
import org.commonmark.node.Node;
import org.commonmark.parser.Parser;
import org.commonmark.renderer.html.HtmlRenderer;
import org.springframework.core.io.ClassPathResource;
import org.springframework.util.FileCopyUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

/**
 * 帮助控制器类，处理前端调用api/help请求
 * 提供README_API.md文件的读取和返回功能
 */
@RestController
@RequestMapping("/api/help")
public class HelpController {

    /**
     * 获取README_API.md文件内容
     * @return 返回包含README_API.md文件内容的ResponseMessage对象
     */
    @GetMapping
    public ResponseMessage<String> getReadmeApi() {
        try {
            // 获取README_API.md文件的绝对路径
            String readmePath = "e:\\MyWebProject\\MyAfterProjecy\\README_API.md";
            File readmeFile = new File(readmePath);
            
            // 检查文件是否存在
            if (readmeFile.exists() && readmeFile.isFile()) {
                // 读取文件内容
                String markdownContent = new String(FileCopyUtils.copyToByteArray(new FileInputStream(readmeFile)), StandardCharsets.UTF_8);
                // 将Markdown转换为HTML
                String htmlContent = convertMarkdownToHtml(markdownContent);
                return ResponseMessage.success(htmlContent, "获取API文档成功");
            }
            
            // 如果直接路径不存在，尝试从类路径加载
            try {
                ClassPathResource resource = new ClassPathResource("README_API.md");
                String markdownContent = new String(FileCopyUtils.copyToByteArray(resource.getInputStream()), StandardCharsets.UTF_8);
                // 将Markdown转换为HTML
                String htmlContent = convertMarkdownToHtml(markdownContent);
                return ResponseMessage.success(htmlContent, "获取API文档成功");
            } catch (IOException e) {
                // 记录详细错误信息以便调试
                System.err.println("无法从类路径加载README_API.md: " + e.getMessage());
                return ResponseMessage.error("未找到README_API.md文件");
            }
        } catch (Exception e) {
            // 捕获所有异常并记录详细错误信息
            System.err.println("处理README_API.md时出错: " + e.getMessage());
            e.printStackTrace();
            return ResponseMessage.error("读取README_API.md文件失败: " + e.getMessage());
        }
    }

    /**
     * 将Markdown文本转换为HTML
     * @param markdown 原始Markdown文本
     * @return 转换后的HTML字符串
     */
    private String convertMarkdownToHtml(String markdown) {
        Parser parser = Parser.builder().build();
        Node document = parser.parse(markdown);
        HtmlRenderer renderer = HtmlRenderer.builder().build();
        return renderer.render(document);
    }
}