package openai

import (
	"bufio"
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"
	"opencatd-open/pkg/tokenizer"
	"opencatd-open/store"
	"strings"

	"github.com/gin-gonic/gin"
)

func ChatProxy(c *gin.Context, chatReq *ChatCompletionRequest) {
	usagelog := store.Tokens{Model: chatReq.Model}

	token, _ := c.Get("localuser")

	lu, err := store.GetUserByToken(token.(string))
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{
			"error": gin.H{
				"message": err.Error(),
			},
		})
		return
	}
	usagelog.UserID = int(lu.ID)

	var prompt string
	for _, msg := range chatReq.Messages {
		switch ct := msg.Content.(type) {
		case string:
			prompt += "<" + msg.Role + ">: " + msg.Content.(string) + "\n"
		case []any:
			for _, item := range ct {
				if m, ok := item.(map[string]interface{}); ok {
					if m["type"] == "text" {
						prompt += "<" + msg.Role + ">: " + m["text"].(string) + "\n"
					} else if m["type"] == "image_url" {
						if url, ok := m["image_url"].(map[string]interface{}); ok {
							fmt.Printf("  URL: %v\n", url["url"])
							if strings.HasPrefix(url["url"].(string), "http") {
								fmt.Println("网络图片:", url["url"].(string))
							}
						}
					}
				}
			}
		default:
			c.JSON(http.StatusInternalServerError, gin.H{
				"error": gin.H{
					"message": "Invalid content type",
				},
			})
			return
		}
		if len(chatReq.Tools) > 0 {
			tooljson, _ := json.Marshal(chatReq.Tools)
			prompt += "<tools>: " + string(tooljson) + "\n"
		}
	}
	switch chatReq.Model {
	case "gpt-4o", "gpt-4o-mini", "chatgpt-4o-latest":
		chatReq.MaxTokens = 16384
	}
	if chatReq.Stream {
		chatReq.StreamOptions = &StreamOption{IncludeUsage: true}
	}

	usagelog.PromptCount = tokenizer.NumTokensFromStr(prompt, chatReq.Model)

	// onekey, err := store.SelectKeyCache("openai")
	onekey, err := store.SelectKeyCacheByModel(chatReq.Model)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	var req *http.Request

	switch onekey.ApiType {
	case "github":
		req, err = http.NewRequest(c.Request.Method, Github_Marketplace, bytes.NewReader(chatReq.ToByteJson()))
		req.Header = c.Request.Header
		req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", onekey.Key))
	case "azure":
		var buildurl string
		if onekey.EndPoint != "" {
			buildurl = fmt.Sprintf("%s/openai/deployments/%s/chat/completions?api-version=%s", onekey.EndPoint, modelmap(chatReq.Model), AzureApiVersion)
		} else {
			buildurl = fmt.Sprintf("https://%s.openai.azure.com/openai/deployments/%s/chat/completions?api-version=%s", onekey.ResourceNmae, modelmap(chatReq.Model), AzureApiVersion)
		}
		req, err = http.NewRequest(c.Request.Method, buildurl, bytes.NewReader(chatReq.ToByteJson()))
		req.Header = c.Request.Header
		req.Header.Set("api-key", onekey.Key)
	default:
		req, err = http.NewRequest(c.Request.Method, OpenAI_Endpoint, bytes.NewReader(chatReq.ToByteJson())) // default endpoint

		if AIGateWay_Endpoint != "" { // cloudflare gateway的endpoint
			req, err = http.NewRequest(c.Request.Method, AIGateWay_Endpoint, bytes.NewReader(chatReq.ToByteJson()))
		}
		if Custom_Endpoint != "" { // 自定义endpoint
			req, err = http.NewRequest(c.Request.Method, Custom_Endpoint, bytes.NewReader(chatReq.ToByteJson()))
		}
		if onekey.EndPoint != "" { // 优先key的endpoint
			req, err = http.NewRequest(c.Request.Method, onekey.EndPoint+c.Request.RequestURI, bytes.NewReader(chatReq.ToByteJson()))
		}

		req.Header = c.Request.Header
		req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", onekey.Key))
	}
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	defer resp.Body.Close()

	var result string
	if chatReq.Stream {
		for key, value := range resp.Header {
			for _, v := range value {
				c.Writer.Header().Add(key, v)
			}
		}
		c.Writer.WriteHeader(resp.StatusCode)
		teeReader := io.TeeReader(resp.Body, c.Writer)
		// 流式响应
		scanner := bufio.NewScanner(teeReader)

		for scanner.Scan() {
			line := scanner.Bytes()
			if len(line) > 0 && bytes.HasPrefix(line, []byte("data: ")) {
				if bytes.HasPrefix(line, []byte("data: [DONE]")) {
					break
				}
				var opiResp ChatCompletionStreamResponse
				line = bytes.Replace(line, []byte("data: "), []byte(""), -1)
				line = bytes.TrimSpace(line)
				if err := json.Unmarshal(line, &opiResp); err != nil {
					continue
				}

				if opiResp.Choices != nil && len(opiResp.Choices) > 0 {
					if opiResp.Choices[0].Delta.Role != "" {
						result += "<" + opiResp.Choices[0].Delta.Role + "> "
					}
					result += opiResp.Choices[0].Delta.Content // 计算Content Token

					if len(opiResp.Choices[0].Delta.ToolCalls) > 0 { // 计算ToolCalls token
						if opiResp.Choices[0].Delta.ToolCalls[0].Function.Name != "" {
							result += "name:" + opiResp.Choices[0].Delta.ToolCalls[0].Function.Name + " arguments:"
						}
						result += opiResp.Choices[0].Delta.ToolCalls[0].Function.Arguments
					}
				} else {
					continue
				}
			}

		}
	} else {

		// 处理非流式响应
		body, err := io.ReadAll(resp.Body)
		if err != nil {
			fmt.Println("Error reading response body:", err)
			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
			return
		}
		var opiResp ChatCompletionResponse
		if err := json.Unmarshal(body, &opiResp); err != nil {
			log.Println("Error parsing JSON:", err)
			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
			return
		}
		if opiResp.Choices != nil && len(opiResp.Choices) > 0 {
			if opiResp.Choices[0].Message.Role != "" {
				result += "<" + opiResp.Choices[0].Message.Role + "> "
			}
			result += opiResp.Choices[0].Message.Content

			if len(opiResp.Choices[0].Message.ToolCalls) > 0 {
				if opiResp.Choices[0].Message.ToolCalls[0].Function.Name != "" {
					result += "name:" + opiResp.Choices[0].Message.ToolCalls[0].Function.Name + " arguments:"
				}
				result += opiResp.Choices[0].Message.ToolCalls[0].Function.Arguments
			}

		}
		for k, v := range resp.Header {
			c.Writer.Header().Set(k, v[0])
		}

		c.JSON(http.StatusOK, opiResp)
	}
	usagelog.CompletionCount = tokenizer.NumTokensFromStr(result, chatReq.Model)
	usagelog.Cost = fmt.Sprintf("%.6f", tokenizer.Cost(usagelog.Model, usagelog.PromptCount, usagelog.CompletionCount))
	if err := store.Record(&usagelog); err != nil {
		log.Println(err)
	}
	if err := store.SumDaily(usagelog.UserID); err != nil {
		log.Println(err)
	}
}