package api.service.dify.impl;

import api.entity.database.dify.DifyAssistant;
import api.entity.input.PageInput;
import api.entity.input.dify.*;
import api.entity.view.system.UserView;
import api.mapper.dify.DifyAssistantMapper;
import api.service.dify.IDifyAssistantService;
import api.service.BaseServiceImpl;
import api.util.helper.HttpHelper;
import api.util.helper.StringHelper;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.gson.Gson;
import lombok.var;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;

import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.Objects;

@Transactional
@Service
public class DifyAssistantServiceImpl extends BaseServiceImpl<DifyAssistantMapper, DifyAssistant> implements IDifyAssistantService{
    public DifyAssistantServiceImpl(){ super(false); }

    private final Gson gson = new Gson();
    //发送对话消息
    @Override
    public SseEmitter chatMessages(DifyChatMessagesInput difyInput,
                                   UserView userView, HttpServletResponse response) throws IOException {
        SseEmitter sseEmitter = new SseEmitter();
        // 设置MIME类型为text/event-stream以符合SSE要求
        response.setContentType("text/event-stream");
        response.setCharacterEncoding("UTF-8");
        PrintWriter writer = response.getWriter();
        try {
            var dify=this .getEntity(difyInput.getId());
            // 1. 设置URL和API密钥
            String apiUrl = dify.getUrl()+"/chat-messages";
            String apiKey = dify.getSecretKey(); // 替换为实际API密钥
            String files="[]";
            if (difyInput.getFiles()!=null&&difyInput.getFiles().size()>0)
            {
                StringBuilder builder=new StringBuilder();
                builder.append("[");
                for (DifyFiles item :difyInput.getFiles())
                {
                    builder.append("{");
                    builder.append("\"type\": \"").append(item.getType()).append("\",");
                    builder.append("\"transfer_method\": \"").append(item.getTransfer_method()).append("\",");
                    if(Objects.equals(item.getTransfer_method(), "remote_url"))
                    {
                        builder.append("\"url\": \"").append(item.getUrl()).append("\"");
                    }
                    else
                    {
                        builder.append("\"upload_file_id\": \"").append(item.getUrl()).append("\"");
                    }
                    builder.append("}");
                }
                builder.append("]");
                files=builder.toString();
            }
            String jsonString="";
            if (difyInput.getInputs()!=null)
            {
                ObjectMapper objectMapper = new ObjectMapper();
                jsonString= objectMapper.writeValueAsString(difyInput.getInputs());
            }
            // 2. 创建JSON请求体
            String jsonBody = "{"
                    + "\"inputs\": "+jsonString+","
                    + "\"query\": \""+difyInput.getQuery()+"\","
                    + "\"response_mode\": \"streaming\","
                    + "\"conversation_id\": \""+difyInput.getConversation_id()+"\","
                    + "\"user\": \""+userView.getUserName()+"\","
                    + "\"files\": \""+files+"\","
                    + "\"auto_generate_name\": \""+difyInput.getAuto_generate_name()+"\""
                    + "}";
            // 3. 创建HTTP连接
            URL url = new URL(apiUrl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Authorization", "Bearer " + apiKey);
            conn.setRequestProperty("Content-Type", "application/json");
            conn.setDoOutput(true);
            // 4. 发送请求体
            try (OutputStream os = conn.getOutputStream()) {
                byte[] input = jsonBody.getBytes(StandardCharsets.UTF_8);
                os.write(input, 0, input.length);
            }
            // 获取响应码
            int responseCode = conn.getResponseCode();
            if (responseCode == HttpURLConnection.HTTP_OK) {
                // 获取响应输入流
                InputStream inputStream = conn.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8));
                String line;
                try {
                    while ((line = reader.readLine()) != null) {
                        if (line.startsWith("data: {\"event\": \"message\"") ||line.startsWith("data: {\"event\": \"message_end\"")) {
                            writer.write(unicodeToString(line)+"\n");
                            // sseEmitter.send(unicodeToString(line)); // 实时发送单条结果
                            System.out.println(unicodeToString(line));
                            writer.flush();
                        }
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } else {
                System.out.println("POST Request is not successful");
            }
            conn.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
        sseEmitter.complete();
        return sseEmitter;
    }

    //发送工作流
    @Override
    public SseEmitter workflows(WorkflowsInput difyInput,
                                UserView userView, HttpServletResponse response) throws IOException {
        SseEmitter sseEmitter = new SseEmitter();
        // 设置MIME类型为text/event-stream以符合SSE要求
        response.setContentType("text/event-stream");
        response.setCharacterEncoding("UTF-8");
        PrintWriter writer = response.getWriter();
        try {
            var dify=this .getEntity(difyInput.getId());
            // 1. 设置URL和API密钥
            String apiUrl = dify.getUrl()+"/workflows/run";
            String apiKey = dify.getSecretKey(); // 替换为实际API密钥
            String jsonString="";
            if (difyInput.getInputs()!=null)
            {
                ObjectMapper objectMapper = new ObjectMapper();
                jsonString= objectMapper.writeValueAsString(difyInput.getInputs());
            }

            // 2. 创建JSON请求体
            String jsonBody = "{"
                    + "\"inputs\": "+jsonString+","
                    + "\"response_mode\": \"streaming\","
                    + "\"user\": \""+userView.getUserName()+"\""
                    + "}";
            // 3. 创建HTTP连接
            URL url = new URL(apiUrl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Authorization", "Bearer " + apiKey);
            conn.setRequestProperty("Content-Type", "application/json");
            conn.setDoOutput(true);
            // 4. 发送请求体
            try (OutputStream os = conn.getOutputStream()) {
                byte[] input = jsonBody.getBytes(StandardCharsets.UTF_8);
                os.write(input, 0, input.length);
            }
            // 获取响应码
            int responseCode = conn.getResponseCode();
            if (responseCode == HttpURLConnection.HTTP_OK) {
                // 获取响应输入流
                InputStream inputStream = conn.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8));
                String line;
                try {
                    while ((line = reader.readLine()) != null) {
                        writer.write(unicodeToString(line)+"\n");
                        // sseEmitter.send(unicodeToString(line)); // 实时发送单条结果
                        System.out.println(unicodeToString(line));
                        writer.flush();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } else {
                System.out.println("POST Request is not successful");
            }
            conn.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
        sseEmitter.complete();
        return sseEmitter;
    }

    private static String unicodeToString(String unicode) {
        StringBuilder sb = new StringBuilder();
        int i = -1;
        int pos = 0;

        while ((i = unicode.indexOf("\\u", pos)) != -1) {
            sb.append(unicode.substring(pos, i));
            if (i + 5 > unicode.length()) {
                pos = i + 2;
                continue;
            }
            String hex = unicode.substring(i + 2, i + 6);
            try {
                sb.append((char) Integer.parseInt(hex, 16));
                pos = i + 6;
            } catch (NumberFormatException e) {
                sb.append(unicode.substring(i, i + 2));
                pos = i + 2;
            }
        }

        sb.append(unicode.substring(pos));
        return sb.toString();
    }
    //消息反馈
    @Override
    public  String feedbacks(DifyFeedbacksInput input,
                             UserView userView) throws IOException {
        var dify=this .getEntity(input.getId());
        String apiUrl = dify.getUrl()+"/messages/"+input.getMessage_id()+"/feedbacks";
        String apiKey = dify.getSecretKey(); // 替换为实际API密钥
        // 2. 创建JSON请求体
        String jsonBody = "{\n" +
                "    \"rating\": \""+input.getRating()+"\",\n" +
                "    \"user\": \""+userView.getUserName()+"\",\n" +
                "    \"content\": \""+input.getContent()+"\"\n" +
                "}";
        return  HttpHelper.DifyHttpPost(apiUrl,apiKey,jsonBody);
    }
    //获取APP的消息点赞和反馈
    @Override
    public  String appFeedbacks(PageInput pageInput,long  id
    ) throws Exception {
        var dify=this .getEntity(id);
        String apiUrl = dify.getUrl()+"/app/feedbacks?page="+pageInput.getPageNum()+"&limit="+pageInput.getPageSize();
        return   HttpHelper.DifyHttpGet(apiUrl,dify.getSecretKey());
    }
    @Override
    public  String suggested(long id, String message_id, UserView userView) throws Exception {
        var dify=this .getEntity(id);
        String apiUrl = dify.getUrl()+"/messages/"+message_id+"/suggested?user="+userView.getUserName();
        return  HttpHelper.DifyHttpGet(apiUrl,dify.getSecretKey());
    }
    //获取会话历史消息
    @Override
    public  String History(DifyHistoryInput input, UserView userView) throws Exception {
        var dify=this .getEntity(input.getId());
        StringBuilder builder=new StringBuilder();
        if (StringHelper.isNotEmpty(input.getFirst_id()))
        {
            builder.append("&first_id").append(input.getFirst_id());
        }
        if (input.getLimit()!=null&&input.getLimit()>0)
        {
            builder.append("&limit").append(input.getLimit());
        }
        String url=builder.toString();
        String apiUrl = dify.getUrl()+"/messages?user="+userView.getUserName()+"&conversation_id="+input.getConversation_id()+url;
        return  HttpHelper.DifyHttpGet(apiUrl,dify.getSecretKey());
    }
    @Override
    public  String conversations(DifyConversationsInput input, UserView userView) throws Exception {
        var dify=this .getEntity(input.getId());
        StringBuilder builder=new StringBuilder();
        if (StringHelper.isNotEmpty(input.getLast_id()))
        {
            builder.append("&last_id").append(input.getLast_id());
        }
        if (input.getLimit()!=null&&input.getLimit()>0)
        {
            builder.append("&limit").append(input.getLimit());
        }
        if (StringHelper.isNotEmpty(input.getSort_by()))
        {
            builder.append("&sort_by").append(input.getSort_by());
        }
        String url=builder.toString();
        String apiUrl = dify.getUrl()+"/conversations?user="+userView.getUserName()+ url;
        return  HttpHelper.DifyHttpGet(apiUrl,dify.getSecretKey());
    }
    //删除会话
    @Override
    public  Boolean DelConversations(long id, String conversation_id, UserView userView) throws Exception {
        var dify=this .getEntity(id);
        String apiUrl = dify.getUrl()+"/conversations/"+conversation_id;
        String requestBody = String.format("{ \"user\": \"%s\" }", userView.getUserName());
        return  HttpHelper.DifyHttpDelete(apiUrl,dify.getSecretKey(),requestBody);
    }
    //会话重命名
    @Override
    public  String Rename(DifyRenameInput input, UserView userView) throws Exception {
        var dify=this .getEntity(input.getId());
        String apiUrl = dify.getUrl()+"/conversations/"+input.getConversation_id()+"/name";
        String apiKey = dify.getSecretKey(); // 替换为实际API密钥
        // 2. 创建JSON请求体
        String jsonBody = "{\n" +
                "    \"name\": \""+input.getName()+"\",\n" +
                "    \"auto_generate\": \""+input.getAuto_generate()+"\",\n" +
                "    \"user\": \""+userView.getUserName()+"\"\n" +
                "}";
        return  HttpHelper.DifyHttpPost(apiUrl,apiKey,jsonBody);
    }


}