package api

import (
	"ZhenTuLocalPassiveAdapter/dto"
	"ZhenTuLocalPassiveAdapter/logger"
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"io"
	"net/http"

	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/codes"
	"go.uber.org/zap"
)

const (
	// 连续性上报接口地址
	continuityReportURL = "https://zhentuai.com/api/device/video-continuity/report"
	// 间隔阈值（毫秒）
	maxAllowedGapMs = 2000
)

// ReportContinuityCheck 上报连续性检查结果
func ReportContinuityCheck(ctx context.Context, results []dto.ContinuityCheckResult) error {
	_, span := tracer.Start(ctx, "ReportContinuityCheck")
	defer span.End()

	span.SetAttributes(attribute.Int("results.count", len(results)))

	// 统计不连续的设备数量
	discontinuousCount := 0
	for _, r := range results {
		if !r.IsContinuous {
			discontinuousCount++
		}
	}
	span.SetAttributes(attribute.Int("discontinuous.count", discontinuousCount))

	// 逐个设备上报
	var lastErr error
	for _, result := range results {
		if err := reportSingleDevice(ctx, result); err != nil {
			logger.Error("上报设备连续性检查结果失败",
				zap.String("deviceNo", result.DeviceNo),
				zap.Error(err))
			lastErr = err
		}
	}

	return lastErr
}

// reportSingleDevice 上报单个设备的连续性检查结果
func reportSingleDevice(ctx context.Context, result dto.ContinuityCheckResult) error {
	_, span := tracer.Start(ctx, "reportSingleDevice")
	defer span.End()

	span.SetAttributes(
		attribute.String("device.no", result.DeviceNo),
		attribute.Bool("continuous", result.IsContinuous),
	)

	// 转换为接口请求格式
	request := convertToReportRequest(result)

	// 序列化请求体
	jsonData, err := json.Marshal(request)
	if err != nil {
		span.SetAttributes(attribute.String("error", err.Error()))
		span.SetStatus(codes.Error, "序列化JSON失败")
		logger.Error("序列化连续性检查请求失败", zap.Error(err))
		return err
	}

	span.SetAttributes(attribute.String("request.body", string(jsonData)))

	// 创建请求
	req, err := http.NewRequestWithContext(ctx, "POST", continuityReportURL, bytes.NewBuffer(jsonData))
	if err != nil {
		span.SetAttributes(attribute.String("error", err.Error()))
		span.SetStatus(codes.Error, "创建请求失败")
		logger.Error("创建连续性检查上报请求失败", zap.Error(err))
		return err
	}
	req.Header.Set("Content-Type", "application/json")

	span.SetAttributes(
		attribute.String("http.url", continuityReportURL),
		attribute.String("http.method", "POST"),
	)

	// 发送请求
	resp, err := GetAPIClient().Do(req)
	if err != nil {
		span.SetAttributes(attribute.String("error", err.Error()))
		span.SetStatus(codes.Error, "发送请求失败")
		logger.Error("发送连续性检查上报请求失败", zap.Error(err))
		return err
	}
	defer resp.Body.Close()

	span.SetAttributes(
		attribute.String("http.status", resp.Status),
		attribute.Int("http.status_code", resp.StatusCode),
	)

	// 读取响应体
	body, err := io.ReadAll(resp.Body)
	if err != nil {
		span.SetAttributes(attribute.String("error", err.Error()))
		span.SetStatus(codes.Error, "读取响应体失败")
		logger.Error("读取连续性检查上报响应失败", zap.Error(err))
		return err
	}

	span.SetAttributes(attribute.String("response.body", string(body)))

	// 解析响应
	var response dto.ContinuityReportResponse
	if err := json.Unmarshal(body, &response); err != nil {
		span.SetAttributes(attribute.String("error", err.Error()))
		span.SetStatus(codes.Error, "解析响应失败")
		logger.Error("解析连续性检查上报响应失败",
			zap.Error(err),
			zap.String("body", string(body)))
		return err
	}

	// 检查业务响应码
	if response.Code != 0 && response.Code != 200 {
		errMsg := fmt.Sprintf("上报失败: code=%d, msg=%s", response.Code, response.Msg)
		span.SetAttributes(attribute.String("error", errMsg))
		span.SetStatus(codes.Error, "上报失败")
		logger.Warn("连续性检查上报业务失败",
			zap.String("deviceNo", result.DeviceNo),
			zap.Int("code", response.Code),
			zap.String("msg", response.Msg))
		return fmt.Errorf(errMsg)
	}

	span.SetStatus(codes.Ok, "上报成功")
	if result.IsContinuous {
		logger.Debug("设备连续性检查上报成功",
			zap.String("deviceNo", result.DeviceNo),
			zap.Int("fileCount", result.FileCount))
	} else {
		logger.Info("设备连续性检查上报成功（不连续）",
			zap.String("deviceNo", result.DeviceNo),
			zap.Int("gapCount", len(result.Gaps)))
	}

	return nil
}

// convertToReportRequest 将内部检查结果转换为接口请求格式
func convertToReportRequest(result dto.ContinuityCheckResult) dto.ContinuityReportRequest {
	// 时间格式
	const timeFormat = "2006-01-02 15:04:05"

	request := dto.ContinuityReportRequest{
		DeviceNo:        result.DeviceNo,
		StartTime:       result.RangeStart.Format(timeFormat),
		EndTime:         result.RangeEnd.Format(timeFormat),
		Support:         true, // 始终支持
		Continuous:      result.IsContinuous,
		TotalVideos:     result.FileCount,
		TotalDurationMs: result.TotalDurationMs,
		MaxAllowedGapMs: maxAllowedGapMs,
	}

	// 转换间隙列表
	if len(result.Gaps) > 0 {
		request.Gaps = make([]dto.ContinuityReportGap, 0, len(result.Gaps))
		for _, gap := range result.Gaps {
			request.Gaps = append(request.Gaps, dto.ContinuityReportGap{
				BeforeFileName: gap.PreviousFileName,
				AfterFileName:  gap.NextFileName,
				GapMs:          int64(gap.GapSeconds * 1000),
				GapStartTime:   gap.PreviousEndTime.Format(timeFormat),
				GapEndTime:     gap.NextStartTime.Format(timeFormat),
			})
		}
	} else {
		request.Gaps = []dto.ContinuityReportGap{}
	}

	return request
}