package system

import (
	"fmt"
	"github.com/gin-gonic/gin"
	"go.uber.org/zap"
	"net/http"
	"os"
	"path/filepath"
	"server/global"
	"server/model/common/response"
	"server/service/stream"
)

// StreamApi API接口结构体
type StreamApi struct{}

var (
	StreamService = stream.NewStreamService()
	// HLS文件存储的相对路径（跨平台兼容）
	hlsBaseDir = filepath.Join("..\\", "server", "hls")
)

// StartStream 启动RTSP转HLS流
// @Tags Stream
// @Summary 启动RTSP转HLS流
// @Security ApiKeyAuth
// @accept application/json
// @Produce application/json
// @Param data body StartStreamRequest true "RTSP地址和流ID"
// @Success 200 {object} response.Response{data=string} "返回HLS流地址"
// @Router /stream/start [post]
func (s *StreamApi) StartStream(c *gin.Context) {
	var req StartStreamRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		global.GVA_LOG.Error("参数验证失败", zap.Error(err))
		response.FailWithMessage("参数错误: "+err.Error(), c)
		return
	}

	hlsUrl, err := StreamService.StartStream(req.RTSPUrl, req.StreamID)
	if err != nil {
		global.GVA_LOG.Error("启动流转换失败", zap.Error(err))
		response.FailWithMessage(err.Error(), c)
		return
	}

	response.OkWithData(map[string]string{
		"hlsUrl": hlsUrl,
	}, c)
}

// StopStream 停止流转换
// @Tags Stream
// @Summary 停止流转换
// @Security ApiKeyAuth
// @accept application/json
// @Produce application/json
// @Param data body StopStreamRequest true "流ID"
// @Success 200 {object} response.Response
// @Router /stream/stop [post]
func (s *StreamApi) StopStream(c *gin.Context) {
	var req StopStreamRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		global.GVA_LOG.Error("参数验证失败", zap.Error(err))
		response.FailWithMessage("参数错误: "+err.Error(), c)
		return
	}

	if err := StreamService.StopStream(req.StreamID); err != nil {
		global.GVA_LOG.Error("停止流转换失败", zap.Error(err))
		response.FailWithMessage(err.Error(), c)
		return
	}

	response.OkWithMessage("流已成功停止", c)
}

// PlayHLS 播放HLS流
// @Tags Stream
// @Summary 播放HLS流
// @accept application/json
// @Produce application/x-mpegURL
// @Param streamId path string true "流ID"
// @Param any path string true "m3u8或ts文件名"
// @Success 200 {file} file "返回视频流文件"
// @Router /stream/hls/{streamId}/{any} [get]
func (s *StreamApi) PlayHLS(c *gin.Context) {
	streamId := c.Param("streamId")
	filePath := c.Param("any")

	// 构建完整的文件路径（跨平台兼容）
	fullPath := filepath.Join(hlsBaseDir, streamId, filePath)

	fmt.Println("fullPath:", fullPath)

	// 检查文件是否存在
	if _, err := os.Stat(fullPath); err != nil {
		global.GVA_LOG.Error("HLS文件不存在", zap.String("path", fullPath), zap.Error(err))
		c.JSON(http.StatusNotFound, gin.H{
			"code": 404,
			"msg":  "HLS文件不存在: " + fullPath,
		})
		return
	}

	// 设置正确的Content-Type
	switch filepath.Ext(fullPath) {
	case ".m3u8":
		c.Header("Content-Type", "application/x-mpegURL")
	case ".ts":
		c.Header("Content-Type", "video/MP2T")
	default:
		c.Header("Content-Type", "application/octet-stream")
	}

	// 禁用缓存，支持断点续传
	c.Header("Cache-Control", "no-cache")
	c.Header("Accept-Ranges", "bytes")

	// 发送文件内容
	c.File(fullPath)
}

// GetStreamList 获取活跃流列表
// @Tags Stream
// @Summary 获取活跃流列表
// @Security ApiKeyAuth
// @accept application/json
// @Produce application/json
// @Success 200 {object} response.Response{data=[]string} "返回活跃流ID列表"
// @Router /stream/list [get]
func (s *StreamApi) GetStreamList(c *gin.Context) {
	list := StreamService.GetActiveStreams()
	response.OkWithData(list, c)
}

// 请求结构体定义
type StartStreamRequest struct {
	RTSPUrl  string `json:"rtspUrl" binding:"required"`  // RTSP流地址
	StreamID string `json:"streamId" binding:"required"` // 流唯一标识
}

type StopStreamRequest struct {
	StreamID string `json:"streamId" binding:"required"` // 流唯一标识
}