package video_server

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"mime/multipart"
	"net/http"
	"os"
	"path/filepath"
	"time"

	"FireLeave_tool/logger"
)

// UploadToNginx 上传视频到 Nginx 服务器，返回 URL
func UploadToNginx(filePath string, eventParams map[string]any, uploadURL string) (string, error) {
	logger.Logger.Printf("开始上传视频到 Nginx: %s → %s", filePath, uploadURL)

	// 打开文件
	logger.Logger.Printf("打开文件: %s", filePath)
	startTime := time.Now()
	file, err := os.Open(filePath)
	if err != nil {
		logger.Logger.Printf("打开文件失败: %v, 耗时: %v", err, time.Since(startTime))
		return "", fmt.Errorf("open file failed: %w", err)
	}
	defer file.Close()
	logger.Logger.Printf("文件打开成功, 耗时: %v", time.Since(startTime))

	// 创建多部分表单
	logger.Logger.Printf("创建多部分表单")
	body := new(bytes.Buffer)
	writer := multipart.NewWriter(body)

	// 创建表单文件字段
	logger.Logger.Printf("创建表单文件字段: %s", filepath.Base(filePath))
	part, err := writer.CreateFormFile("file", filepath.Base(filePath))
	if err != nil {
		logger.Logger.Printf("创建表单文件字段失败: %v", err)
		return "", fmt.Errorf("create form file failed: %w", err)
	}

	// 复制文件内容到表单
	logger.Logger.Printf("开始复制文件内容到表单")
	copyStartTime := time.Now()
	if _, err = io.Copy(part, file); err != nil {
		logger.Logger.Printf("复制文件内容失败: %v, 耗时: %v", err, time.Since(copyStartTime))
		return "", fmt.Errorf("copy file failed: %w", err)
	}
	logger.Logger.Printf("文件内容复制成功, 耗时: %v", time.Since(copyStartTime))

	// 序列化事件参数
	logger.Logger.Printf("序列化事件参数")
	eventJSON, err := json.Marshal(eventParams)
	if err != nil {
		logger.Logger.Printf("序列化事件参数失败: %v", err)
		return "", fmt.Errorf("marshal event failed: %w", err)
	}
	logger.Logger.Printf("[Upload Event parameters]eventParams: %v", eventParams)
	logger.Logger.Printf("[Upload Event parameters]eventJSON: %s", string(eventJSON))

	// 写入事件字段
	logger.Logger.Printf("写入事件字段到表单")
	if err := writer.WriteField("event", string(eventJSON)); err != nil {
		logger.Logger.Printf("写入事件字段失败: %v", err)
		return "", fmt.Errorf("write event field failed: %w", err)
	}

	// 关闭表单写入器
	logger.Logger.Printf("关闭表单写入器")
	if err := writer.Close(); err != nil {
		logger.Logger.Printf("关闭表单写入器失败: %v", err)
		return "", fmt.Errorf("close writer failed: %w", err)
	}

	logger.Logger.Printf("[HTTP Request]URL: %s", uploadURL)
	logger.Logger.Printf("[HTTP Request]Content-Type: %s", writer.FormDataContentType())
	logger.Logger.Printf("[HTTP Request]Body 长度: %d bytes", body.Len())

	// 创建HTTP请求
	logger.Logger.Printf("创建HTTP请求")
	req, err := http.NewRequest("POST", uploadURL, body)
	if err != nil {
		logger.Logger.Printf("创建HTTP请求失败: %v", err)
		return "", fmt.Errorf("create request failed: %w", err)
	}
	req.Header.Set("Content-Type", writer.FormDataContentType())

	// 发送HTTP请求
	logger.Logger.Printf("发送HTTP请求到 Nginx")
	httpStartTime := time.Now()
	client := &http.Client{Timeout: 180 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		logger.Logger.Printf("发送HTTP请求失败: %v, 耗时: %v", err, time.Since(httpStartTime))
		return "", fmt.Errorf("upload failed: %w", err)
	}
	defer resp.Body.Close()
	logger.Logger.Printf("HTTP请求发送成功, 耗时: %v", time.Since(httpStartTime))

	// 读取响应
	logger.Logger.Printf("读取HTTP响应")
	respStartTime := time.Now()
	respBody, _ := io.ReadAll(resp.Body)
	logger.Logger.Printf("响应读取完成, 耗时: %v", time.Since(respStartTime))
	logger.Logger.Printf("[nginx response]Status: %d", resp.StatusCode)
	logger.Logger.Printf("[nginx response]Body: %s", string(respBody))

	if resp.StatusCode != http.StatusOK {
		logger.Logger.Printf("Nginx返回错误状态码: %d", resp.StatusCode)
		return "", fmt.Errorf("nginx error %d: %s", resp.StatusCode, string(respBody))
	}

	// 解析响应
	logger.Logger.Printf("解析Nginx响应")
	var result struct {
		Code   int             `json:"code"`
		Result json.RawMessage `json:"result"`
	}
	if err := json.Unmarshal(respBody, &result); err != nil {
		logger.Logger.Printf("解析响应失败: %v", err)
		return "", fmt.Errorf("parse response failed: %w", err)
	}
	if result.Code != 0 {
		logger.Logger.Printf("Nginx返回错误代码: %d", result.Code)
		return "", fmt.Errorf("nginx error: %s", string(respBody))
	}

	// 提取视频URL
	logger.Logger.Printf("提取视频URL")
	var videoURL string
	if err := json.Unmarshal(result.Result, &videoURL); err != nil {
		logger.Logger.Printf("提取视频URL失败: %v", err)
		return "", fmt.Errorf("extract video URL failed: %w", err)
	}

	logger.Logger.Printf("[ Upload Successful ] Local file: %s → Remote URL: %s", filePath, videoURL)
	logger.Logger.Printf("视频上传完成, 总耗时: %v", time.Since(startTime))
	return videoURL, nil
}